JPH0715162B2 - Column base structure and construction method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column base structure for supporting various structures in the field of civil engineering and construction, and a method for constructing the structure.

[0002]

2. Description of the Related Art In the field of civil engineering and construction, various column base structures such as steel columns, steel pipe columns and reinforced concrete columns have been constructed as supports for various structures, but they have particularly high mechanical strength and weather resistance. Reinforced concrete columns are often used as column base structures suitable for supporting large-scale structures with high demands.

As is well known, the reinforced concrete column is formed by forming a cylindrical or square formwork corresponding to the entire circumference and arranging it, and then placing concrete, or a movable mold formed to a predetermined size. A method of vertically arranging a concrete column for each set section by using a frame is adopted, and a bridge pier will be described as a representative example.

FIG. 22 is a schematic explanatory view of a method of constructing the bridge piers 2a and 2b in constructing the mountain bridge 1. In the figure, 3a and 3b are abutments for supporting the bridge 1, 4
Reference characters a and 4b are foundation structures of the bridge piers 2a and 2b, and are usually constructed as a reinforced concrete block body.

Now, taking the case of the pier 2a as an example,
After constructing the foundation structure 4a, as shown in FIG. 23, the temporary steel column 5 is erected on the foundation structure 4a, and after the arranging work, the movable formwork 6 is jacked up at predetermined intervals, and successively. Method of constructing bridge pier 2a having desired height by repeating the step of placing concrete (hereinafter referred to as A invention)
Has been adopted.

[0006]

Since the column pedestal structure targeted by the present invention is a high structure extending in the vertical direction, such as the bridge pier or tower-like structure, the conventional method using a mold is A strong scaffold surrounding the frame and supporting work are required, the material cost for construction is large, and in addition, a large number of construction workers are required, and since it is work at a high place, various safety equipment must be equipped. Therefore, there is a problem that the construction cost increases.

Furthermore, in the construction in a remote area such as the above-mentioned mountain bridge pier, in addition to the transportation of materials and personnel to the site, a large amount of money is required for the accommodation of the construction worker, and the column base structure is 50 In the case of a huge one reaching up to -100 m, a long-term work, especially for a year, is required, and the cost thereof is extremely large.

In the invention A, the movable formwork 6 is used to eliminate the repetitive work of assembling and disassembling the formwork which is conventionally performed in each unit work process, thereby saving the material and shortening the work period. However, there is still a problem that a high degree of skill is required for assembling and moving the movable form 6, and the cost for measures for protecting the hydraulic system and their control mechanism from wind and rain and an earthquake increases. .

Further, although the reinforced concrete piers have high strength and excellent weather resistance, surface deterioration and erosion are feared due to environmental changes such as acid rain in recent years, and especially the durability of the mountain bridge piers which is difficult to maintain. There are many issues from the viewpoint of maintenance and extension of construction period.

An object of the present invention is to provide a column base structure having high mechanical strength, excellent weather resistance, and low construction and maintenance costs. Another object is to provide a construction method which requires a small amount of materials for construction, is easy and safe to work, does not require skilled workers, and has a short working period and a low cost. Further, another different purpose is to use cells made of standardized steel sheet piles to quickly form a reinforcing bar material without requiring a lot of manpower, and then to give high strength by concrete placing. It is to provide a method capable of economically constructing a column base structure.

[0011]

SUMMARY OF THE INVENTION As a means for overcoming the above problems and achieving the object, the present invention has a unit length of a cylindrical or square tubular closed cell in which a predetermined number of unit steel sheet piles are joint-fitted. , And then filling the inner cavity of the closed cells with concrete, and after solidifying, repeating the means for constructing the unit closed cells in the same manner on the upper part of the closed cells. A column base structure is provided.

[0012] According to another means of the present invention, a corrosion-resistant metal folding plate is attached to the outer surface of a column base structure in which a desired number of unit closed cells are vertically joined and integrated with each other through a cement filler. The column base structure is excellent in corrosion resistance. Next, still another means according to the present invention is to use a construction guide mast that is erected on the upper surface of the foundation structure, and successively join unit steel sheet piles by joint fitting to form a predetermined cylindrical or prismatic unit closing unit. After forming cells, a column base structure for vertically constructing a predetermined number of unit column bases by repeating the unit column base building process of placing concrete in the unit closed cell lumens and solidifying, to construct a column base of a desired height It provides a method of building the body.

Still another different means according to the present invention is to use a construction guide mast erected on the upper surface of the foundation structure, and successively join unit steel sheet piles in a predetermined cylindrical shape or square tube. After forming a unit closed cell of a shape, repeat the unit column base construction process of placing concrete in the unit closed cell inner cavity and solidifying it, and construct a column base of a desired height by vertically installing a predetermined number of unit column bases. Then, the present invention provides a method for constructing a column base structure, in which a corrosion-resistant metal folded plate is hooked on the outer surface of the column base structure with a cement-based filler.

According to another means of the present invention, a unit closed cell in which unit steel sheet piles are successively joint-fitted in advance and formed into a predetermined cylindrical shape or rectangular tube shape is erected on the upper surface of the foundation structure using a crane device. The unit column base construction process of hanging the concrete structure in the inner space of the unit closed cell and solidifying it by hanging it down on the foundation structure along with the guide mast for construction described above is repeated one by one. It is intended to provide a method for constructing a column base structure which is installed and constructs a column base having a desired height.

Further, according to another means of the present invention, a unit closed cell in which unit steel sheet piles are successively joint-fitted in advance and formed into a predetermined cylindrical shape or a rectangular tube shape is used for the upper surface of the foundation structure by using a crane device. A unit pillar base construction step of suspending and laying down on the foundation structure along with the construction guide mast standing upright, and then pouring and solidifying concrete in the unit closed cell inner cavity is sequentially repeated to give a predetermined number of unit pillars. To provide a method for constructing a column base structure in which legs are vertically installed to construct a column base having a desired height, and then an anticorrosive metal origami plate is hooked with a cement-based filler on the outer surface of the column base structure. is there.

[0016]

In the column base structure of the present invention, a closed cell having a predetermined length, which is formed by jointly fitting a predetermined number of unit steel sheet piles and having a predetermined length, is used as a construction unit. By constructing a unit closed cell composed of a composite of steel and concrete by filling, a desired number of the unit closed cells are vertically connected and constructed as an integrated structure,
Since it has extremely high toughness and extremely high mechanical strength, it has high durability and high reliability as a structure.

Further, since the closed cell itself functions as a formwork and a reinforcing bar, there are few materials for construction, and further, there is no need for assembly and disassembly work like the conventional formwork work, and rebar work is also omitted. Therefore, the labor saving effect is extremely large. Moreover, since the simple work of fitting steel sheet piles and placing concrete occupy most of the process, there is an advantage that the work is easy, there is no need for skilled workers, and the construction period is short. Is a great deal.

Further, in the present invention, a desired number of the unit closed cells are vertically joined and integrated on the outer surface of the column base structure,
The column base structure with anti-corrosion metal folded plates attached to it through the cement-based filler to impart anti-corrosion properties, has a long-term durability without repair due to the excellent anti-corrosion function of the anti-corrosion metallic orthographs and cement-based filler. Since it is possible to guarantee the reliability, the maintenance cost is low, and it is possible to expect excellent economic efficiency, especially in places with bad environmental conditions.

Next, according to the construction method of the present invention, unit steel sheet piles are successively joint-fitted using a construction guide mast standing on the upper surface of the foundation structure, and a predetermined cylindrical or square tubular unit is closed. After the cells are formed, a unit column base construction step of pouring and solidifying concrete in the unit closed cell lumen is repeated to vertically install a predetermined number of unit column bases, and a column base of a desired height is constructed. Therefore, it can be implemented with a simple guide mast device, crane device and concrete supply device,
It has the advantage of being able to work safely without the need for skilled workers.

In another construction method of the present invention, unit steel sheet piles are successively joint-fitted by using a construction guide mast erected on the upper surface of the foundation structure to form a predetermined cylindrical or square tubular unit. After forming the closed cells, the unit column base construction step of pouring and solidifying concrete into the unit closed cell lumen is repeated to vertically install a predetermined number of unit column bases to construct a column base of a desired height, and then It is a method of hooking the anticorrosion metal folding plate on the outer surface of the column base structure with a cement-based filler, and since it is possible to carry out the anticorrosion metal folding plate hooking work for each unit column base building step,
In addition to the advantage that the construction period is short and the construction cost is low, there is an advantage that economically high weather resistance can be imparted.

In another construction method according to the present invention, unit steel closing sheets, which are sequentially joint-fitted in advance and are formed into a predetermined cylindrical shape or a rectangular tube shape, are used as a basic structure by using a crane device. A unit column base construction step of suspending and laying down on the foundation structure along with a construction guide mast erected on the upper surface of the body and then pouring and solidifying concrete in the unit closed cell inner cavity is sequentially repeated to a predetermined unit. It is a method of constructing a column base structure in which a column base is installed vertically and a column base having a desired height is constructed.
Pre-assemble the unit closed cells on a scaffolding with good working conditions close to the construction site, and then repeat the process of constructing the unit column base by placing concrete in the crane device for each unit closed cell and solidifying it, thereby repeating the desired column base. As a result, the work efficiency and safety can be further improved.

Further, another construction method according to the present invention is that a unit closed cell in which unit steel sheet piles are successively joint-fitted in advance and formed into a predetermined cylindrical shape or a rectangular tube shape is used as a basic structure by using a crane device. A unit column base construction process of suspending and laying down on the foundation structure along with a construction guide mast erected on the upper surface, and then pouring and solidifying concrete in the unit closed cell lumen, is repeated a predetermined number of units. A column base is vertically installed to construct a column base having a desired height, and then a corrosive anticorrosive metal plate is hooked on the outer surface of the column base structure with a cement-based filler. Since the anti-corrosion metal folding plate attachment work can be carried out subsequently, the work period is short, and like the above-mentioned invention, in addition to the high work efficiency and safety, the construction cost is low and the economically high weather resistance Has the effect of giving .

【Example】

Next, the present invention will be described in detail with reference to the drawings. 1 is a schematic front view of a pier 7 according to an embodiment of a column base structure of the present invention, FIG. 2 is a sectional view taken along line AA of FIG.
[FIG. 3] is a partial schematic front view showing a joint portion of a unit closed cell. The bridge pier 7 is constructed by vertically arranging unit pillar pedestals 8a, 8b, 8c on the foundation structure 4a by a method described later. Reference numeral 9 indicates a road bridge supported by the pier 7.

In this example, as a main member constituting the bridge pier 7, a steel sheet pile 1 formed by welding, as joints, a semi-rectangular steel sheet pile to both ends of a flange of I-shaped steel as shown in FIG.
0a (described in detail below as steel sheet pile 36 in FIG. 9) is used, a predetermined number of joints of the steel sheet pile 10a are fitted to form a cylindrical closed cell 11, and then the closed cell 11 has a concrete inner cavity. By casting 12, the unit column base 13 made of a composite of steel and concrete is constructed.

In the present invention, the reason why the steel sheet pile is referred to as a unit steel sheet pile is that the length of the steel sheet pile is limited to some extent due to restrictions in production technology, transportation, and construction technology. From the need to be, as long as the steel sheet pile is used, a design with the length dimension as a unit is required,
Therefore, since the closed cell and the column base described later are also constructed as a unit body based on the length dimension, they are referred to as a unit closed cell and a unit column base in the present invention.

FIG. 3 shows a state in which the unit column bases 8a and 8b are bolted together by a plurality of joint plates 14, and unit steel sheet piles 10d and 10e adjacent to the joint portions 15a of the unit steel sheet piles 10b and 10c. The joint portion 15b is shifted in the height direction by a predetermined distance so that the joint portion does not become a structural weak point and the joining work can be easily performed. In the column base structure of the present invention, the unit steel sheet pile, which is the main member, has a narrow width as a unit body, is lightweight, is easy to transport, and is compatible with the column base of any diameter regardless of the size by fitting the joint. Therefore, it has a large degree of freedom in design, and has a great economic advantage when used for mountain bridge piers, etc. where working conditions are extremely poor.

Although it is well known that the above-mentioned steel sheet pile is built in the ground to construct a revetment cell or a construction underground wall, a unit made of steel sheet pile as in the present invention. By connecting multiple column bases, like a pier, for example, a diameter of 5-10
As far as the inventors of the present invention have known, it has never been attempted to construct a long column base structure which is an integral structure having a height of 30 to 100 m in m.

Next, an example of the construction method according to the present invention is shown in FIGS. 4 (a), (b), (c), FIGS. 5 (d), (e),
It will be described with reference to the schematic explanatory view of the construction process of (f). First,
As shown in FIG. 4 (a), a crane device 17 is built on the mountain slope portion 16, and then the foundation structure 4 a is constructed at the planned pier indicated by the broken line 18 by the well-known deep foundation method. 19
Indicates a construction vehicle. Next, as shown in FIG. 4 (b), the construction guide mast 20 made of a shaped steel frame is erected using the crane device 17. 21 is the construction guide mast 20
With a ring beam that is circumferentially provided at appropriate intervals, for example, angle steel or H-shaped steel is processed into a ring shape, and the construction guide mast 2
It is fixed to 0 using an appropriate fixing means such as a bolt or a clamp.

Next, the unit steel sheet piles 22 are successively hung from the crane device 17, are fitted along the ring beam 21 and are joint-fitted, and a unit closed cell 23 is constructed as shown in FIG. 4 (c). , Scaffolding 24 is provided. Then, the inner cavity of the closed cell 23 is filled with concrete 25. In the filling, the building guide mast 20 and the ring beam 21 are buried and left as a reinforcing bar material, leaving a length necessary for joining the unit steel sheet piles 22. Therefore, it is desirable that the ring beam 21 is preliminarily drilled or the ring beam 21 is made of chevron steel so that the filled concrete 25 does not have a cavity, and it is desirable that the smooth filling of concrete is not hindered. .

Next, after waiting for the concrete 25 to solidify, the construction guide mast 20 is joined to the next-stage construction guide mast 20a, and as shown in FIG. The unit steel sheet pile 22 is used to form a closed cell 23a in the next stage, which is vertically joined to the closed cell 23 and then filled with concrete 25. Furthermore, FIG.
As shown in (e), the closed cell 23b ...
By repeating the vertical connection of 23d and filling the concrete 25, the pier 7 having a predetermined height is constructed as shown in FIG. 5 (f).

6A, 6B, 7C, 7D
FIG. 16 is a schematic explanatory drawing of a construction process relating to another means of the present invention, and 16a is a flat ground where work is possible within the operating range of the crane device 17, and when there is no suitable place, the mountain slope 16 is excavated in advance. And create. The feature of this means is that the unitary closed cell 23 is formed on the flat ground 16a as shown in FIG. 6 (a), and then it is hoisted by the crane device 17 as shown in FIG. 6 (b) to form the foundation structure. 4a, and other than that, as shown in FIG.
5B, 5C, 5D, 5E, and 5F are performed in the same manner. not to mention,
The forming work of the unit closed cells 23 on a flat ground is safe and efficient, and the forming work can be carried out while waiting for the solidification of the filled concrete, so that there is an advantage that the working time can be greatly shortened.

Next, FIG. 8 is a schematic cross-sectional view showing the construction of the construction guide mast 20, the ring beam 21, the steel sheet pile 22 and the scaffold 24, and 26 is the construction guide mast 2.
0 shows a bolt for fixing the ring beam 21. Figure 9
FIG. 7 is a partial schematic perspective view showing a situation in which a web 28 of a steel sheet pile 22 is guided by using sliding guide metal fittings 27 mounted on the ring beam 21 at appropriate intervals.

As the steel sheet pile used in the present invention, a well-known joint, for example, a U or Z type joint having a joint such as a steel pipe type joint or a Larzen type joint can be used.
0 (a), a straight steel sheet pile 29 having a particularly strong full strength joint, and as shown in FIG. 10 (b), a spherical flat steel sheet 31 at the center of the flange 30 of the straight steel sheet pile 29.
Steel sheet pile 32 welded as a web, and further steel sheet pile 36 formed by welding linear steel sheet pile half joints 35a, 35b on both sides of the flange 34 of the I-shaped steel 33 shown in FIG. 11, shown in FIG. Flange corner 38 of square steel pipe 37
Steel sheet piles 39 and the like formed by welding the above-mentioned joints 35a and 35b made of a half-section of a straight type steel sheet pile to a and 38b have high joint strength and, in addition, a large fitting margin for fitting to the curve of the closed cell. Therefore, it is most suitable for the purpose of the present invention.

The column base structure of the present invention is not limited to the columnar shape, and the twin-body connecting columns 40a and 40b as shown in FIGS. 13 (a) and 13 (b), and FIG. 14 (a), (B)
The elliptical columns 41a, 41b and the hollow cylindrical columns 42a, 42b as shown in FIGS. 15 (a) and 15 (b) can be used to enhance mechanical strength according to the purpose. Is also free. Therefore, the column base structure is not limited to the above-mentioned bridge pier, and can be applied to the main tower of suspension bridges, silos, chimneys, marine structures, and the like.

16 (a) and 16 (b) are partial cutaway front views and partial cutaway side views according to an embodiment in which the column base structure of the present invention is applied to a pier 7'having a hollow rectangular cross section, and FIG. It is a BB sectional partial view of FIG. 16 (a). The pier 7'is
Similar to the embodiment of FIG. 1, the unit column base 1 is mounted on the foundation structure 4a ′.
3'is constructed by vertically arranging a plurality of stages, and a road bridge 9'is supported on a pier 7 '.

In this embodiment, since a hollow section is used, four types of steel sheet piles 63, 65, 67, 69 shown in FIGS. 18 (a), (b) and FIGS. 19 (a), (b) described later are used. A predetermined number of joints are fitted on both inner and outer surfaces, and each steel sheet pile 63, 65, 6 is fitted inside.
A closed cell 11 ′ having a rectangular tubular shape having a closed space of a predetermined width sandwiched between the inner and outer surfaces of 7, 69 is formed, and then the closed cell 1
By pouring concrete 12 'into the closed space of the inner cavity 1', a hollow unit column base 13 'made of a composite of steel and concrete is constructed.

FIG. 18A shows a steel sheet pile 63 used in the middle portion.
The joints 62a, 62b, 62 made of a semi-rectangular steel sheet pile at each end of both flanges of the I-shaped steel 61 are shown.
c and 62d are welded together. FIG. 18 (b) shows another type of steel sheet pile 65 used in the middle part.
The two I-shaped steels 61 are juxtaposed, and adjacent flange ends are connected by steel plates 64, and the other ends are the same as the steel sheet pile 63 in FIG. Joints 62a, 62b, 62c, 62d
Is welded.

FIG. 19 (a) shows a steel sheet pile 67 used for the corner portion indicated by C in FIG. 17, in which the linear bodies 66a to 66e obtained by cutting straight steel sheet piles into predetermined dimensions are assembled by welding. A steel sheet pile 67 composed of a square tubular core and a joint between the inner and outer surfaces is formed. FIG. 19B shows D in FIG.
The steel sheet pile 69 used for the corner portion indicated by is shown in FIG.
68f is assembled by welding to form a steel sheet pile 69 having joints on the inner and outer surfaces in three directions of the square tube-shaped core portion. The steel sheet piles having the same shapes as the steel sheet piles 67 and 69 in FIGS. 19A and 19B have, for example, a joint made of a semi-conduit of a straight type steel sheet pile inside and outside in the sheet pile connecting direction of a square steel tube serving as a core. It can also be obtained by welding one pair at a time.

The steel sheet pile used for the column base structure is JIS-A.
In addition to using the material specified in -5528, JIS
-Adopting the highly weather-resistant rolled steel specified in G-3125 has a high anticorrosion function and eliminates the need for repair work related to painting, and thus has a large economic effect. In addition, JIS-A-
In the case of the material specified in 5528, sufficient coating is required, but since the column base structure of the present invention is a steel material in the outer shell,
Since a magnetic adsorption type coating robot can be used, there is no need for scaffolding construction that requires a large amount of cost for coating work at any time during construction or repair, and there is an advantage that corrosion protection cost can be extremely low. Furthermore, well-known aluminum or zinc spraying as anticorrosion means can be carried out as necessary.

In addition to the above-mentioned means, one feature of the present invention is to provide a column base structure free from the concern of corrosion protection for at least several decades. The corrosion protection structure is shown in FIG. A description will be given according to a cutaway perspective view. Figure 20
In the figure, 43 is a plate made of corrosion-resistant metal such as stainless steel or titanium, and has a key groove 44 at predetermined intervals.
a, 44b, 44c are provided vertically.

Numerals 45a and 45b are spacing retention spacers,
The head portions 46a and 46b are provided with concave grooves 47a and 47b for holding the key grooves 44a and 44c from the back side, and the base portions 48a and 4b.
8b is adhered to the steel sheet pile 22. Therefore, the anticorrosion metal folding plate 43 is held facing the steel sheet pile 22 with the set spacing 49 interposed therebetween via the spacing retaining spacers 45a and 45b.

Next, the set interval 49 is filled with an adhesive cementitious filler 50 such as mortar or concrete, and the anticorrosive metal folding plate 43 and the steel sheet pile 22 are filled.
Are bonded to each other and the keyways 44a, 44c
The keyways 44a, 44 by concrete surrounding the
Since b and 44c are to be gripped, the anticorrosion metal plate 43 and the steel sheet pile 22 are very strongly bonded. In other words, the anticorrosion metal folding plate 43 is in a state in which hooks are placed on the filled concrete through the keyways 44a, 44b, 44c.

Therefore, in the present invention, the anticorrosive metal folding plate 4 is used.
The connection between 3 and the steel sheet pile 22 is said to be that the anticorrosion metal folding plate is hooked with the cement-based filler on the outer surface of the column base structure.
The spacing retaining spacers 45a and 45b are made of an electrically insulating material such as a polymer compound or a metal fitting having an insulating material partially interposed therebetween in order to avoid electrochemical corrosion between different metals. Is desirable.

Regarding the holding of the key grooves 44a and 44c by the space keeping spacers 45a and 45b, especially when the anticorrosion metal plate 43 is thin, there is a concern that the key grooves 44a and 44c may come off, but the separation is prevented. 21 (a),
As shown in the schematic cross-sectional view of (b), the key groove shape retaining metal fitting 53 including a pressing bolt 51 and a pressing metal fitting 52 whose tip can be widened by screwing of the pressing bolt 51 is provided in the key groove 44a.
, And the function of gripping the keyway 44a by the space retaining spacer 45c is increased. Further, if the studs 54, the vertical rebars 55, and the horizontal rebars 56 planted in the steel sheet pile 22 are arranged in the set interval 49 as shown in FIG. 20, the risk of cracking or flaking of the filled concrete is further reduced. , Strong and semi-permanent anticorrosion effect can be expected.

[0045]

EFFECTS OF THE INVENTION The column base structure of the present invention uses steel sheet piles having excellent mechanical strength and uses pre-constructed closed cells, or constructs successive closed cells and constructs the desired number of closed cells vertically. Since it is constructed by connecting and joining, it can be quickly built even in a bad environment, and it has extremely high mechanical strength and a large resistance to destructive acting force as a structure, and it also requires less repair and is a structure. High reliability.
Furthermore, it is extremely economical because it requires less material for construction.

Further, since the column base structure to which the anticorrosive metal folding plate is hooked has high strength and does not require semipermanent anticorrosive repair, it is excellent when constructed in a remote environment such as a mountainous area. The economic effect of can be expected.

Next, since the method of constructing the column base structure is basically based on the closed cell vertical connection, the work is simple and no skilled work is required. Therefore, the safety is high and the working equipment and tools are the conventional method. Compared to, it has a merit that it is smaller and construction cost is lower. Furthermore, the construction method of hooking the anticorrosive metal folding plate on the outer surface of the column base structure in the present invention with a cement-based filler is sure to attach the anticorrosion metal folding plate, and it is easy to handle even a thin folding plate, Since no skill is required for the work, the work cost is low and the economic effect is great.

[Brief description of drawings]

FIG. 1 is a schematic front view of a bridge pier according to an embodiment of a column base structure of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a partial schematic front view showing a joint portion of a unit closed cell.

4 (a), (b) and (c) are schematic explanatory views of a construction process according to the construction method of the present invention.

5 (d), (e), and (f) are schematic explanatory views of a construction process according to the construction method of the present invention following FIG.

6 (a) and 6 (b) are schematic explanatory views of a construction process according to the construction method of the present invention.

7 (c) and 7 (d) are schematic explanatory views of a construction process according to the construction method of the present invention following FIG.

FIG. 8 is a schematic cross-sectional view showing configurations of a construction guide mast, a ring beam, a steel sheet pile, and a scaffold according to the present invention.

FIG. 9 is a schematic perspective view showing a guide state of a steel sheet pile.

10 (a) and 10 (b) are schematic plan views of a steel sheet pile formed by welding a straight type steel sheet pile and a spherical flat steel as a web.

FIG. 11 is a schematic plan view of a steel sheet pile having an I-shaped steel web according to the present invention.

FIG. 12 is a schematic plan view of a steel sheet pile having a configuration in which a joint is provided on a square steel pipe according to the present invention.

13 (a) and 13 (b) are schematic cross-sectional views of a twin-body connecting column according to the present invention.

14A and 14B are schematic cross-sectional views of an elliptical column according to the present invention.

15 (a) and 15 (b) are schematic cross-sectional views of a hollow column according to the present invention.

16 (a) and 16 (b) are a partial cutaway schematic front view and a partial cutaway schematic side view of a pier having a hollow prismatic cross section according to another embodiment of the column base structure of the present invention.

17 is a sectional view taken along line BB of FIG.

18 (a) and 18 (b) are schematic plan views of a steel sheet pile used in the hollow portion of FIG.

19 (a) and 19 (b) are schematic plan views of a steel sheet pile used for the corner portion of FIG.

FIG. 20 is a partially cutaway perspective view of the anticorrosion structure according to the present invention.

21 (a) and 21 (b) are schematic cross-sectional views showing a state during and after the insertion of the keyway shape retaining metal fitting.

FIG. 22 is a schematic explanatory view showing a conventional pier construction method.

FIG. 23 is a schematic explanatory view of a conventional jack-up construction method for constructing a bridge pier.

[Explanation of symbols]

 1 Mountain bridge 2a, 2b Pier 3a, 3b Abutment 4a, 4b Foundation structure 5 Temporary steel column 6 Mobile formwork 7 Pier 8a-8c Unit pillar base 9 Road bridge 10a-10e Steel sheet pile 11 Closed cell 12 Concrete 13 Unit pillar base 14 Joint plates 15a, 15b Joints 16 Mountain slopes 17 Crane devices 18 Planned pier locations 19 Construction vehicles 20, 20a Construction guide masts 21 Ring beams 22 Unit steel sheet piles 23 Unit closing cells 23a-23d Unit closing cells 24 Scaffolds 25 Concrete 26 Bolt 27 Sliding Guide Metal Fitting 28 Web 29 Linear Steel Sheet Pile 30 Flange 31 Flat Flat Steel 32 Steel Sheet Pile 33 I-Shaped Steel 34 Flange 35a, 35b Joint 36 Steel Sheet Pile 37 Square Steel Pipe 38a, 38b Flange Corner 39 Steel Sheet Pile 40 Twin Body Connected Column 41 Elliptical Column 42 Hollow Column 43 Anticorrosion Metals 44a-44c Key Grooves 45a, 45b Space Retaining Spacers 46a, 46b Heads 47a, 47b Recessed Grooves 48a, 48b Base 49 Set Interval 50 Cement-based Filler 51 Press Bolt 52 Press Metal 53 Key Key Shape Retaining Metal 54 Stud 55 Vertical rebar 56 Horizontal rebar 61 I-shaped steel 62a to 62d Joint 63 Steel sheet pile 64 Steel sheet 65 Steel sheet pile 66a to 66e Linear steel sheet pile assembly 67 Steel sheet pile 68a to 68f Linear steel sheet pile assembly 69 Steel sheet pile

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Naoto Imanishi 20-1 Shintomi, Futtsu-shi, Chiba Nippon Steel Co., Ltd. Technology Development Division (72) Inventor Takeshi Katayama 2-6-3 Otemachi, Chiyoda-ku, Tokyo Within Nippon Steel Co., Ltd. (56) Reference JP-A-5-263403 (JP, A)

Claims (6)

[Claims] 1. A column base structure in which a desired number of cylindrical or rectangular closed cells, which are joint-fitted with a predetermined number of unit steel sheet piles, are vertically joined, and the closed cell inner cavities are filled with concrete. . 2. A unit guide cell for standing upright on the upper surface of a foundation structure is used to successively join unit steel sheet piles to form a predetermined cylindrical or rectangular unit closed cell, and then the unit is closed. The construction of a column base structure according to claim 1, wherein a predetermined number of unit column bases are vertically installed by repeating a unit column base construction step of placing concrete in the closed cell inner cavity and solidifying the column bases. Method. 3. A construction guide mast in which unit closing cells, each of which is formed into a predetermined cylindrical shape or a rectangular tube shape by successively fitting unit steel sheet piles in advance, are erected on the upper surface of the foundation structure using a crane device. Hanging along with the foundation structure,
The pillar according to claim 1, wherein a unit pillar base construction step of pouring and solidifying concrete in the unit closed cell inner cavity is sequentially repeated to vertically install a predetermined number of unit pillar bases to construct a pillar base having a desired height. How to build a leg structure. 4. The column base structure according to claim 1, wherein an anticorrosive metal folding plate is hooked on the outer surface with a cement filler. 5. A unit guide cell for standing upright on the upper surface of a foundation structure is used to successively join unit steel sheet piles to form a predetermined cylindrical or rectangular unit closed cell, and then the unit is closed. By repeating the unit column base construction process of pouring and solidifying concrete in the closed cell lumen, a predetermined number of unit column bases are vertically installed to construct a column base of a desired height, and then an anticorrosive metal is formed on the outer surface of the column base structure. The method for constructing a column base structure according to claim 4, wherein the folded plate is hooked with a cement-based filler. 6. A guide mast for construction in which a unit closed cell, which is formed in a predetermined cylindrical shape or a rectangular tube shape by sequentially fitting unit steel sheet piles in a predetermined manner, is erected on the upper surface of the foundation structure using a crane device. Hanging along with the foundation structure,
Next, the unit column base construction step of pouring and solidifying concrete in the unit closed cell lumen is sequentially repeated to vertically install a predetermined number of unit column bases to construct a column base of a desired height, and then the column base structure. The method for constructing a column base structure according to claim 4, wherein an anticorrosive metal plate is attached to the outer surface of the body with a cement-based filler.