JP2967876B1 - Method of forming concrete slab and method of constructing upper road suspension bridge - Google Patents

Abstract

An object of the present invention is to provide a method for forming a concrete floor slab of a bridge structure in a short construction period without using a large-sized erection machine. The present invention also provides a method for constructing a suspension bridge of an upper road type using this method. SOLUTION: Plate member 1 of precast concrete
2 is formed, and wheels 9 are attached to the lower surface of the plate-like member, and run on the upper flange 5b of the steel girder 5 already installed. After moving to the predetermined position, the position adjusting bolt 16 is rotated to bear its own weight with the position adjusting bolt, and the wheel 9 is removed. Then, the plate member is installed at a predetermined height. After arranging a plurality of concrete members on the girder as described above, concrete is cast between them to be integrated. This method can be applied to the construction of a suspension bridge of an upper road type, a temporary rail is provided on a suspension member stretched between fixed structures, a concrete plate-like member is moved and moved, and these are connected. To be the upper girder.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of arranging a plurality of plate members of precast concrete at predetermined positions and connecting them to form a floor slab of a bridge structure, and using this method, The present invention relates to a method of constructing an upper suspension bridge having a suspension member stretched between a plurality of fixed structures and an upper girder supported by columns on the suspension member.

[0002]

2. Description of the Related Art In general, many bridge structures have a concrete floor slab in a portion to be a road surface. The method of constructing this concrete floor slab includes a method of casting concrete on site at the same time as a girder part, a method of casting concrete on an erected girder, and a method of constructing a precast concrete plate member. And constructing them. Among them, the method using a plate member made of precast concrete does not require assembling a lot of formwork at a construction site of a bridge, and has advantages such as reduction of work on site and shortening of construction period at site.

[0003] A method of forming a floor slab using the above precast concrete plate-like member is generally carried out by the following steps. When a girder or truss supporting a load is erected between substructures such as an abutment or a pier, a plurality of concrete plates previously formed in a factory or a manufacturing yard are placed on the main structure such as the girder or truss. Are arranged. These are connected to each other and firmly fixed to the main structure. Prestressing is often introduced in the axial direction of the bridge to connect these concrete plates.

[0004] As described above, the work of arranging the precast concrete plates on the main structure is performed by lifting the concrete plates with a crane or the like and placing them at predetermined positions on the main structure.

[0005] On the other hand, an upper road type suspension structure bridge, for example, an upper road type suspension deck bridge, stretches a suspension deck, which is a thin concrete member continuous between fixed structures such as an abutment or a pier, and stands a support on the suspension deck. The upper girder is often used as a concrete floor slab. Also in the case of constructing such an upper girder, there are many advantages such as a reduction in work at a high place on site and a shortened construction period by using a precast concrete member.

[0006]

However, the method of forming a floor slab using a precast concrete member as described above has the following problems. A crane is used to arrange the precast concrete plate members at predetermined positions over the entire length of the bridge, but a crane with a long arm and a large working range is required in order to work efficiently. It is desirable that this crane works on the ground, that is, on the riverbed, etc., along the axis of the bridge to be erected, but it is desirable to carry out the work in deep valleys, etc. Therefore, it is difficult to arrange the precast concrete members. On the other hand, in the case of constructing an overhead-type suspended floor slab bridge, a similar problem occurs when an upper-road girder is to be constructed using a precast concrete member.

The present invention has been made in view of the above-described problems, and has as its object to provide a method of forming a concrete floor slab in a short construction period without using a large erection machine, or an overhead road suspension. The purpose is to provide a way to build a structural bridge.

[0008]

In order to solve the above-mentioned problems, a first aspect of the present invention is to form a plurality of plate members made of precast concrete, and to form a wheel on a lower surface of the plate members. Then, the wheel is run on the already constructed support structure to a predetermined position by the wheels, and a lower end protruding by rotating a position adjusting bolt screwed substantially perpendicularly to the plate-like member is applied to the support structure. Contacting, supporting the weight of the plate-shaped member with the position adjustment bolt, removing the wheel, rotating the position adjustment bolt to set the vertical position of the plate-shaped member, From the step of attaching the wheels to the step of setting the plate-like member at a predetermined position on the support structure, a step of attaching the plate-like member to a plurality of plate-like members is performed. Fixing, concrete There is provided a method for forming the plate.

In the above method, the supporting structure supports a precast concrete plate-like member to which wheels are attached, and the shape and structure are not limited as long as the supporting structure can run on the wheels. Includes steel girders, concrete girders, trusses made of steel or concrete, or a composite structure of these, which have already been installed. Further, the bridge member is not included in the completed bridge structure, and may be a temporary girder, a temporary rail, or the like constructed to travel and move the plate member made of precast concrete.

The form of the position adjusting bolt is not limited as long as its lower end protrudes from the lower surface of the plate member made of precast concrete and the amount of protrusion can be changed by rotation. What can rotate from the upper side of a plate-shaped member is desirable. For precast concrete plate members,
It is preferable to be screwed via a nut-like metal fitting fixed to concrete.

In the method of forming a concrete floor slab having the above-described structure, a precast concrete plate-like member manufactured in advance in a factory or a manufacturing yard is placed on a support structure at an arbitrary position with favorable conditions. Then, the vehicle can be driven by wheels and can be easily installed at a predetermined position. In other words, a large crane is not required when a precast concrete plate-like member is placed near an abutment on a support structure such as a girder that has already been constructed.If a small lifting device is used, a precast concrete The plate-like member can be arranged at a predetermined position over the entire length of the bridge.

When the plate member made of precast concrete is moved to a predetermined position, the wheel can be removed by supporting the plate member with the position adjusting bolt, and the position adjusting bolt can be further rotated by directly rotating the position adjusting bolt. The plate member can be adjusted to a predetermined height. Therefore, the concrete plate-like member can be easily and quickly installed without using a jack or the like.

According to a second aspect of the present invention, in the method of forming a concrete floor slab according to the first aspect, the step of fixing the plate-like member to a support structure comprises: attaching the plurality of plate-like members to the support structure. After being arranged on the body, concrete is cast so as to be in close contact with both opposing end surfaces of the adjacent plate members and the upper surface of the support structure, and both plate members are integrated and the support structure is formed. Shall be fixed to

According to such a method, the plate members are easily integrated by the concrete cast between the arranged plate members, and the support for supporting these plate members is provided. It is also immobilized on the structure. Especially,
If a reinforcing bar, a stud dowel, an anchor, or the like is arranged so as to protrude from a portion where concrete is cast from each of the plate members and the support structure, the members are firmly integrated by these members.

According to a third aspect of the present invention, in the method of forming a concrete floor slab according to the second aspect, a filling member that is flexibly deformed on a lower surface of the plate-like member near an end surface that is in close contact with the concrete. When the plate-like member is set at a predetermined position, the filling member is sandwiched between the lower surface of the plate-like member and the upper surface of the support structure to be deformed. At the time of installation, the leakage of concrete is prevented by the filling member.

[0016] With this configuration, even if there is a small gap between the support structure and the lower surface of the precast concrete plate member, concrete for connecting and integrating the plate members is cast. Occasionally, concrete or cement paste is prevented from flowing into these voids. Therefore, the work of limiting the concrete placing portion by the filler or the formwork can be simplified, and the working efficiency is improved.

According to a fourth aspect of the present invention, in the method for forming a concrete floor slab according to the first aspect, the support structure is a steel girder already erected, and the wheel is
The vehicle travels on an upper flange of the steel girder. The wheel flange of the wheel or a protruding member fixed to the plate-like member is engaged with a side edge of the upper flange of the steel girder to travel the wheel. Shall be guided.

In general, steel girders can be constructed with a high degree of accuracy and the wheels can run directly on their upper flanges. By engaging a wheel flange or a protruding member fixed to a plate-like member to be transferred to the side edge of the upper flange, the wheel can travel accurately along the upper flange of the steel girder. Therefore, a temporary rail or the like becomes unnecessary, and the number of work steps is reduced.

According to a fifth aspect of the present invention, there is provided a suspension member stretched between two fixed structures, a support standing on the support, and a road surface formed on the support. A method of constructing an upper suspension bridge having an upper girder,
Between the fixed structure, stretched in a state in which deflection the suspended material occurs, erected a plurality of posts on the Tsuzai, spanned a horizontal member between the top of the posts, the wheels on the lower surface An object of the present invention is to provide a method of constructing an upper road suspension structure bridge in which an attached precast concrete plate member is moved on a predetermined position by traveling on the horizontal member, and the plate member is fixed to the top of the column.

The above-mentioned hanging material can be, for example, a cable or a suspended floor slab which is a concrete member which is thin enough to be deformed flexibly and which is suspended and supported by an embedded steel material. Further, a precast concrete member for forming a suspended floor slab may be a temporary member that is suspended from a cable.

The structure bridge suspended above Raise formula is a Tsuzai stretched over a state in which bending occurs between the fixed structure, up the post to the hanging member on substantially is flat bridged on the supports And a so-called reverse suspension bridge using a cable as a suspension member, an upper road suspension deck bridge using a thin concrete plate-like member as a suspension member, and the like. In addition,
The upper girder is not limited to the one including the I-shaped and T-shaped cross sections, but also includes a plate-shaped one.

In such a method for constructing a suspension bridge with an upper road type, since the precast concrete plate-like member travels on the horizontal member and moves to a predetermined position, the entire length of the bridge can be used without using a large crane or the like. Plate members can be arranged. Therefore, it is possible to simplify facilities and equipment for erection, and to reduce construction costs. In addition, when the support is erected on the suspension, the rigidity of the suspension is extremely small, and measures to maintain stability against falling of the support may be required.However, the support is provided between the tops of the plurality of supports. It is also possible to secure the stability of the support by the horizontal member.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic side view and a cross-sectional view showing an example of a bridge to which a method for forming a concrete floor slab according to the present invention is applied. This bridge is a two-span continuous road bridge having steel girders, two abutments 1a and 1b and a pier 2
Supports the steel girder 3, on which a concrete slab 4 is formed.

The steel girder 3 is, as shown in FIG.
The load is supported by two main girders 5 having an I-shaped cross section, and these main girders 5 are interconnected by cross girders 6. Reference numeral 7 shown in FIG. 1B is a rib provided vertically along the web 5 a of the main girder 5.

The concrete floor slab 4 is formed by arranging a plurality of precast concrete plate members on a steel girder 3, connecting and integrating them, and fixing them to the main girder 5. Prestress is introduced in the bridge axis direction and at right angles to the bridge axis. Such a concrete floor slab 4 is formed by the following steps. This method of forming a concrete floor slab is an embodiment of the invention described in claim 1 or claim 4.

As shown in FIG. 2A, the abutments 1a, 1b
When the steel girder 3 is erected on the pier 2, the precast concrete plate member 12, which is produced in a factory or a production yard and is prestressed in a direction perpendicular to the bridge axis, is lifted by the crane 11, and the main girder 5 Placed on top. At this time, four wheels are attached to the lower surface of the plate-like member 12, and these wheels 9 are mounted on the inner edge of the upper flange 5b of the main girder 5, as shown in FIGS. The wheel flange is engaged with the edge of the upper flange 5b of the main girder, and the vehicle can travel in the bridge axis direction. The precast concrete plate-like member 12 placed on the main girder 5 in this manner is connected to a wire 14 by a winch 13 as shown in FIG.
And is moved to a predetermined position.

The plate-like member 12 moved to a predetermined position is
As shown in FIG. 5, by rotating the position adjusting bolt 16, the position adjusting bolt 16 is supported on the upper flange 5b. The position adjusting bolt 16 is screwed with a nut-like cylindrical metal fitting 17 embedded and fixed in the concrete plate-shaped member 12, and penetrates from the upper side of the plate-shaped member 12 so that the tip projects downward. I have. Therefore, by rotating the position adjusting bolt 16, its tip abuts on the upper flange 5b, and by further rotating, the plate-like member 12 can be lifted and supported. As described above, when the weight of the precast concrete plate-shaped member 12 is borne by the position adjusting bolt 16 and the wheel 9 is in an unloaded state, the wheel 9 is removed together with the frame 10 by loosening the wheel mounting bolt 15. it can.

Thereafter, as shown in FIG. 5 (b), the position adjusting bolt 16 is rotated in the reverse direction to lower the precast concrete plate member 12 to a predetermined height. At this time, the stud dowel 8 erected on the upper surface of the upper flange 5b is housed in a hole 12a provided in the plate member 12 in advance.

When the plate member 12 is set at a predetermined position,
Mortar is filled between the upper flange 5b and the plate member 12 and in the hole 12a provided in the plate member 12, and the main beam 5 and the plate member 12 are integrated. Also, concrete or mortar is cast between a plurality of plate members, and after hardening, prestress in the bridge axis direction is introduced to be integrated. Also,
The position adjusting bolt 16 is pulled out after the mortar filled in the lower side of the plate member 12 is hardened, and the remaining through hole is filled with mortar to finish the bridge surface flat.

By forming the concrete floor slab 4 in the above steps, the precast concrete plate member 12 can be easily lifted near one of the abutments 1a and placed at the same position on the steel girder 3. And the plate members 12 can be arranged over the entire area of the bridge. Therefore, equipment such as a large crane is not required, and work efficiency is improved. Also, after moving to the predetermined position, the position adjusting bolt 1
With the use of 6, the wheels 9 can be easily removed and installed at a predetermined height.

Next, a description will be given of a method of constructing an upper road suspension bridge according to an embodiment of the present invention. FIG. 6 is a schematic side view and a cross-sectional view of a road-type suspension deck bridge that can be constructed by the method according to claim 5.
This upper road type suspended deck bridge is provided with two abutments 21 and 22 fixed to the ground by an earth anchor 23, a suspended deck 24 stretched between these abutments, and vertically raised from the suspended deck 24. The main part is composed of a plurality of columns 25 and an upper path girder 26 supported on the columns.

The abutments 21 and 22 are made of reinforced concrete and are constructed on the ground.
Is firmly fixed to the ground by an earth anchor 23 so as not to fall or slide against a horizontal force transmitted from the ground. The ground anchor 23 is formed by drilling a hole in the ground, inserting a PC steel into the hole, and then grouting the ground. By applying a tension to the PC steel, the abutment is fixed to be pressed against the ground. Is what you can do.

The suspended floor slab 24 includes two abutments 21 and 22.
This is a thin concrete plate formed so as to be continuous between the steel plates, and a plurality of PC steel materials are arranged in the axial direction.
The PC steel material is integrated with the concrete of the suspended slab, and the PC steel material resists the tensile force, and the suspended slab is stretched between the abutments.

The strut 25 is made of a steel pipe rising from both sides of the suspended slab 24.
4 so as to stand on its own. The steel pipes rising from both side edges are connected to each other at the top by a transverse member 27, and the upper end of the steel pipe is almost horizontally placed on the plate 2.
8 are joined.

The upper girder 26 is formed by connecting precast concrete plate members in the bridge axis direction, and prestress is introduced in the bridge axis direction. The upper girder 26 may be continuous between two abutments, or may be appropriately divided and provided with an expansion joint.

Next, a description will be given of a method of constructing the above-mentioned suspended slab bridge. First, as shown in FIG. 7A, two abutments 21 and 22 are formed so as to face each other at the erection position, and are firmly fixed to the ground by an earth anchor 23. Then, the cable 31 is stretched between these abutments. A plate member 32 of precast concrete for forming the suspended floor slab 24 is formed in a factory or a manufacturing yard, is lifted by a crane 33 near one of the abutments 21, and is suspended and supported by the cable 31.

The plate-like member 32 has a bridge-axis groove formed on the upper side, and as shown in FIG.
The cable 31 is lifted so as to be accommodated therein, and a short steel rod 34 is locked from the upper side of the cable 31 inside the groove so that the weight of the plate-shaped member 32 is borne by the cable 31. Further, as shown in FIG. 10, a support 25 is already attached to the plate-like member 32.

The plate member 3 suspended from the cable 31
As shown in FIG. 7 (b), one end of a wire 35 is connected to 2, and the wire 35 is pulled to a predetermined position by a winch 36 provided near the abutment 22 on the opposite side. In this way, the plurality of plate-like members 32 are sequentially suspended from the cable 31, and are arranged over substantially the entire area between the abutments as shown in FIG.

The top of the column 25 is connected in the bridge axis direction by a horizontal member 44 made of L-shaped section steel, and the horizontal member 44 is used to move the precast concrete member 41 for forming the upper girder. It is a temporary girder. Then, as shown in FIG. 8 (b), the prestressed concrete member 41 is lifted by the crane 33 and placed on the horizontal member 44.

As shown in FIGS. 11 and 12, the precast concrete member 41 for forming the upper girder is
Wheels 43 are mounted on the lower surface via a frame 42, and are mounted on the horizontal member 44 and run in the bridge axis direction. Further, a part 42 a of the frame projects below the running surface of the wheel 43, and is guided by the side surface of the horizontal member 44 in the axial direction of the horizontal member. The traveling of the precast concrete member 41 is performed by pulling the wire 35 by the winch 36 as in the movement of the plate member 32 forming the suspended floor slab as shown in FIG. 8B.

When the precast concrete member 41 is moved to a predetermined position, as shown in FIG. 13, a position adjusting bolt 46 screwed substantially vertically to the member via a cylindrical metal member 45 is rotated. The plate 2 on the support 25
8, the weight of the precast concrete member 41 is supported by the position adjusting bolt 46. Then, while removing the wheel 43, the horizontal member 44 is also removed, and the precast concrete member 41 is set at a predetermined height by rotating the position adjusting bolt 46 as shown in FIG.

As described above, when the precast concrete members 41 forming the upper girder are arranged over almost the entire area between the abutments as shown in FIG.
Concrete is poured between the plate-like members 32 of the precast concrete suspended and supported in the groove and in the upper groove of the plate-like members, and the plate-like members 32 are connected to form a continuous suspension deck 24 between the abutments and the cable. Integrate with After the concrete has hardened, an appropriate prestress is introduced into the concrete of the suspended slab 24 by introducing tension into the secondary cables arranged in the axial direction of the suspended slab 24.

On the other hand, concrete is also cast between the precast concrete members 41 forming the upper girder to form a continuous member. Precast concrete member 41
The concrete 47 is protruded from the end face where the embedded reinforcing bar 47 joins in a U-shape, and concrete is cast so as to embed the reinforcing bar 47 projecting from the two precast concrete members 41 to be joined. And a plate-shaped girder. The concrete 48 connecting the precast concrete members is directly poured onto the plate 28 provided on the top of the column 25, and simultaneously joins the top of the column and the concrete floor slab.

In order to perform this concrete casting, an elastic member 49 which is flexibly deformed is attached to the lower surface of the precast concrete member 41 in advance. This elastic member 49 is continuously adhered to a portion along the end face where concrete filling the space between the members is cast, and when the precast concrete member 41 is installed at a predetermined height, it is shown in FIG. As described above, the precast concrete member 41 is sandwiched between the lower surface of the precast concrete member 41 and the plate 28 at the top of the column, and is deformed to close the gap. Therefore, when placing concrete between the precast concrete members, it is not necessary to close the gap with a joint material or the like, and the working efficiency is improved. When the concrete hardens, prestress is appropriately introduced in the axial direction of the upper girder, and the main structure of the bridge is completed.

In such a method of constructing a suspended slab bridge, both the suspended slab 24 and the upper girder 26 are formed using members made of precast concrete, and a large sized slab is required for installing these members at predetermined positions. Efficient construction is possible without using machinery and equipment. In the method of constructing an upper suspension slab, the method of forming an upper girder made of a continuous concrete slab is an embodiment of the invention described in claim 1, claim 2 or claim 3 of the present application. It is.

[0046]

As described above, in the method for forming a concrete slab according to the present invention, even when the bridge length is long, the concrete slab can be efficiently formed without using large equipment or facilities. be able to. Also, in the method of constructing an upper suspension bridge according to the present invention, an efficient upper suspension bridge can be constructed without using large-sized equipment or facilities.

[Brief description of the drawings]

FIG. 1 is a schematic side view and a sectional view showing an example of a bridge to which a method for forming a concrete floor slab according to the present invention is applied.

FIG. 2 is a construction procedure diagram showing a method of forming a concrete slab in the bridge of FIG.

FIG. 3 is a schematic cross-sectional view showing a state in which a plate member of precast concrete travels and moves in the method of forming a concrete floor slab shown in FIG.

4 is a schematic side view showing a state of the precast concrete plate member shown in FIG. 3 during traveling movement.

FIG. 5 is an enlarged sectional view showing a wheel and a position adjusting bolt attached to a plate member made of precast concrete.

FIG. 6 is a schematic side view and a cross-sectional view showing an example of an upper road suspension deck bridge that can be constructed by the method of constructing an upper suspension bridge according to the present invention.

FIG. 7 is a construction procedure diagram showing a method of constructing the upper road type suspended deck bridge shown in FIG.

8 is a construction procedure diagram showing a method of constructing the upper road type suspended deck slab shown in FIG.

9 is a construction procedure diagram showing a method of constructing the upper road type suspended floor slab bridge shown in FIG.

10 is a schematic cross-sectional view showing a state in which a plate-like member of precast concrete is suspended from a cable in the construction method shown in FIGS. 7 to 9. FIG.

FIG. 11 is a schematic sectional view showing a state in which a precast concrete member for forming an upper girder is traveled and moved in the construction method shown in FIGS. 7 to 9;

12 is a schematic side view showing a state of the precast concrete member shown in FIG. 11 during traveling movement.

FIG. 13 is an enlarged sectional view showing wheels and position adjustment bolts attached to a precast concrete member.

FIG. 14 is an enlarged sectional view showing a state where a precast concrete member is installed at a predetermined position by a position adjusting bolt.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Abutment 2 Pier 3 Steel girder 4 Concrete floor slab 5 Main girder 6 Cross beam 7 Rib 8 Stud dowel 9 Wheel 10 Frame 11 Crane 12 Precast concrete plate member 13 Winch 14 Wire 15 Wheel mounting bolt 16 Position adjustment bolt 21 Abutment 22 Abutment 23 Earth anchor 24 Suspended floor slab 25 Prop 26 Upper girder 27 Lateral member 28 Plate 31 Cable 32 Precast concrete plate member 33 Crane 34 Steel rod 35 Wire 36 Winch 41 Precast concrete member 42 Frame 43 Wheel 44 Horizontal member 45 Cylindrical fitting 46 Position adjusting bolt 47 Reinforcing bar 48 Concrete cast on site 49 Elastic member

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) E01D 21/00 E01D 11/02

Claims (5)

(57) [Claims] 1. A plurality of plate members made of precast concrete are formed, wheels are attached to the lower surface of the plate members, and the wheels are moved to a predetermined position on a support structure already constructed, by the wheels. After rotating the position adjusting bolt screwed substantially vertically to the lower end protruding to contact the support structure, supporting the weight of the plate-like member with the position adjusting bolt, and removing the wheels, Rotating the position adjustment bolt to set the vertical position of the plate member, from the step of attaching wheels to the plate member, to setting the plate member at a predetermined position on the support structure The method of forming a concrete floor slab, wherein the step (c) is performed on a plurality of plate members, and the plate members are fixed to the support structure. 2. The method for forming a concrete floor slab according to claim 1, wherein the step of fixing the plate-like member to a support structure includes: after arranging the plurality of plate-like members on the support structure;
Concrete is cast so as to be in close contact with both opposing end surfaces of adjacent plate members and the upper surface of the support structure, and both plate members are integrated and fixed to the support structure. A method of forming a concrete slab. 3. The method for forming a concrete floor slab according to claim 2, wherein a filling member that deforms flexibly is bonded to a lower surface of the plate-like member near an end surface that is in close contact with the concrete, When setting the plate-like member at a predetermined position, the filling member is sandwiched between the lower surface of the plate-like member and the upper surface of the support structure and deformed. A method for forming a concrete floor slab, wherein leakage of concrete is prevented by the method. 4. The method of forming a concrete floor slab according to claim 1, wherein the support structure is a steel girder already erected, and the wheel runs on an upper flange of the steel girder. A concrete floor slab characterized in that a wheel flange of the wheel or a projecting member fixed to the plate-like member is engaged with a side edge of an upper flange of the steel girder to guide the running of the wheel. Forming method. 5. An upper road having a suspending member stretched between two fixed structures, a support raised on the support, and an upper girder spanning over the support to form a road surface. a method for constructing a Shikitsu structure bridge, between the fixed structure, stretched in a state in which deflection the suspended material occurs, erected a plurality of posts on the Tsuzai, between the top of the strut A precast concrete plate-like member with wheels attached to the lower surface is moved on the horizontal member to a predetermined position, and the plate-like member is fixed to the top of the column. To build an upper road suspension bridge.