JPH07300817A - Concrete-filled steel pipe truss pier and construction method - Google Patents

Abstract

PURPOSE:To provide the structure of a pier which makes it possible to shorten the construction process and enhance its load bearing capacity and reduce the weight and eliminate the eminence work. CONSTITUTION:Panel blocks 9 in which horizontal beams 2 and slanting beams 3 are joined with a plurality of steel pipe posts having a rig inside, are manufactured. The panel blocks 9 are erected on a lift rack and the horizontal beams 2 and the slanting beams 3 are joined with each other, thereby building up a 3D block. The lift rack 10 is adapted to rise and maintained at a specified position, the lower stage blocks 9 are erected in a lower space and joined with each other and then the lift rack is adapted to fall. The same process is repeated hereafter, thereby finishing a steel pipe truss. After that, concrete 1b is filled up in the steel pipe posts 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete-filled steel pipe truss pier and a construction method thereof for a relatively large-scale pier used for bridges such as highways and railway bridges and viaducts.

[0002]

2. Description of the Related Art Heretofore, as is well known, these bridge piers have generally been of a structural type such as a column made of reinforced concrete, an elliptic column or a prism. Therefore, when constructing these bridge piers, the method of assembling a formwork and placing concrete inside the formwork was repeated to start up. That is, the construction procedure is divided into several stages from the lower part of the pier: scaffold assembly, rebar assembly, formwork assembly, concrete placement, concrete curing, formwork demolding, and scaffolding assembly again. It was a method of repeating the work.

[0003]

The conventional concrete structure type and construction method for a bridge pier have the following problems. Reinforcing bar assembly and formwork assembly are labor-intensive and affect the process, but it is difficult to shorten the work period because the conventional structure type and the construction method accompanying it cannot save labor. It was In order to assemble and start up the formwork and reinforcing bars up to a high place, and to place concrete, it is necessary to assemble a scaffold around it, and it takes a lot of work, and all work is done at a high place, which is dangerous. Especially in recent years, when skilled workers are scarce, work at high places may cause deterioration of quality.
Since the formwork and reinforcing bars are assembled and the concrete is placed at a high place, it is difficult to take measures to keep the work environment constant, and it is difficult to shorten the process because it is necessary to stop the work in rainy or stormy weather. In addition, since concrete requires a certain curing period for strength to appear after it is poured, the process becomes longer accordingly. Since the pier structure made of concrete is heavy,
The scale of the foundation becomes large and it takes a lot of trouble. Claim 1 of the present invention has been made to solve the above-mentioned conventional problems, and it is possible to shorten the process by omitting troublesome rebar assembly, formwork assembly work, and the like. It is an object of the present invention to provide a bridge pier structure that is designed to reduce the load bearing capacity and weight of the pier, and claim 2 provides a method of constructing a pier that eliminates work in dangerous high places and can work all year long in low places. It is intended.

[0004]

In order to achieve the above object, the pier structure according to claim 1 of the present invention is a truss structure having a concrete-filled steel pipe having high strength and toughness as a main member. The structure is such that the rib 1a continuous to the inside
A plurality of steel pipe main columns 1 are erected at intervals,
Each steel pipe main column 1 is joined by a plurality of horizontal beams 2 and oblique beams 3, and a stiffening ring plate 8 is welded to the inside of the steel pipe main column 1 at the joint between the steel pipe main column 1, horizontal beams 2 and oblique beams 3. The concrete-filled steel pipe truss pier is characterized in that the inside of the steel pipe main column 1 is filled with concrete 1b. Also, at the bridge pier installation point, an elevating platform 11 that can move up and down along a plurality of vertical columns 12 is installed, and horizontal beams 2 and oblique beams 3 are joined between steel pipe main columns 1 on the ground near the factory or the site. Then, a flat panel block 9 is manufactured, and the panel block 9 is vertically installed at a predetermined position of the pier installation point with its surface facing, and the lower part is clamped to the lifting platform 11, so that the panel block 9 The horizontal beam 2 and the slanted beam 3 are joined between the facing surfaces to form a solid block 10, and then the elevating stand 11 is raised to hold the solid block 10 up to a predetermined height, and a predetermined assembly space is provided below. The panel block 9 is built in the assembly space, and the upper end of the steel pipe main column 1 is connected to the three-dimensional block 10 held by the elevating platform 11 to form the steel pipe main column 1.
Concrete that is characterized in that it is joined to the lower end, the elevating platform 11 is lowered to the ground part, and the above-described operation is repeated to complete a steel pipe truss of a predetermined height, and then the steel pipe main column 1 is filled with concrete 1b. A method of constructing a filled steel pipe truss bridge pier is set forth in claim 2. Furthermore, the method of constructing a concrete-filled steel pipe truss bridge pier according to claim 2 is characterized in that the lifting platform 11 is covered with a simple windproof / snowproof facility 17 capable of working in all weather conditions. It is a thing. Further, the method for constructing a concrete-filled steel pipe truss bridge pier according to claim 2 of the present invention eliminates the work at high places, manufactures and assembles a three-dimensional block of the truss on the ground, and lifts it up and down by the elevating stand 11. The three-dimensional block 10 is manufactured and assembled, joined with the three-dimensional block 10 of the preceding assembly, and sequentially extended in the height direction to complete the steel pipe truss, and then the steel pipe main column is filled with concrete 1b. Is as follows. (B) At the bridge pier installation point, an elevating platform 11 that can move up and down along a plurality of vertical columns 12 is installed. (B) Steel pipe main pillar 1 on the ground near the factory or site
The horizontal beam 2 and the slanted beam 3 are joined together to form a flat panel block 9. (C) The panel block 9 is installed in a vertical direction at a predetermined position of the pier installation point so as to face the surface, and the lower part is clamped to the lifting platform 11. (D) Horizontal beam 2 and diagonal beam 3 between the facing surfaces of the panel block 9.
Are joined together to form a solid block 10. (E) Ascending / descending platform 11 raises and holds solid block 10 to a predetermined height, and a predetermined assembly space is formed below. (F) A steel pipe main column 1 of a three-dimensional block 10 in which a lower panel block 9 manufactured in the same manner as in (b) is built in the assembly space, and the upper end of the steel pipe main column 1 is held by an elevating platform 11. Join to the bottom of. (G) The lifting platform 11 is lowered to the ground. (H) After repeating the following (c) to (g) to complete a steel pipe truss having a predetermined height, the steel pipe main column 1 is filled with concrete 1b. In addition, since the construction method of the present invention is performed at a low place work on the ground,
If you cover the surroundings of the lifting platform 11 with simple wind and snow protection equipment,
It is possible to work even in the rain.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the structure and construction method of a concrete-filled steel pipe truss type pier of the present invention will be described below with reference to the drawings. 1 and 2 are a front view and a side view of a concrete-filled steel pipe truss bridge pier (hereinafter, sometimes simply referred to as a bridge pier) of the present invention in the axial direction of the bridge, and FIG.
-A cross section (plan view) is shown. The pier is assembled by joining three-dimensional blocks 10a to 10e that are divided into a plurality of pieces in the height direction (five in this example), and the upper end of the pier is embedded and fixed in the superstructure 4 (bridge girder concrete) and the lower end. Is substructure 5
It is embedded and fixed in (base concrete). The details of each member and the fixed portion are as follows.

[Members to be used] Four steel pipe main columns 1 are connected by a horizontal beam 2 and a diagonal beam 3 made of a steel pipe or H-shaped steel. Concrete is filled in the steel pipe main pillar 1. [Concrete-filled steel pipe main column] Steel pipe main column 1 is shown in Figs.
As shown in (1), the inner surface has continuous ribs 1a. The filling concrete 1b and the steel pipe are integrated by the rib 1a. The compressive stress, the tensile stress and the bending stress acting on the concrete-filled steel pipe main column 1 are borne by the concrete and the steel pipe as a composite cross section, and form a cross section having a small diameter and high yield strength and toughness.

[Superstructure Joining Part] As shown in FIG. 6, the superstructure connecting part 4a is formed by joining two shift stoppers 7 to the steel pipe main column 1 in a portion to be embedded in the superstructure concrete 4b.
This slip stopper 7 is intended to be integrated with the concrete 4b of the superstructure 4, and the vertical and horizontal forces and moments acting on the superstructure joint 4a can be obtained by pushing out the concrete 4b of the superstructure 4 Satisfies the allowable stress of pull-out shear and horizontal push-out shear. FIG. 8 is a detailed sectional view of the shift stopper 7 in which a steel pipe or round steel is spirally wound and welded.

[Substructure Joining Part] As shown in FIG. 7, the substructure connecting part is formed on the steel pipe main pillar 1 in the same manner as the superstructure connecting part 4a.
The book stopper 7 is welded and joined. Substructure joint 5a
Vertical force, horizontal force, and moment acting on the
The concrete 5a satisfies the allowable stresses of the punching / pulling shear and the horizontal punching shear.

[Grading] As shown in FIGS. 9 and 10, concrete-filled steel pipe main columns 1, steel pipe horizontal beams 2, and steel pipe oblique beams 3
Since the force is concentrated on the graded portion 6 to which is joined, in order to prevent local deformation of the graded portion 6, one or more stiffening ring plates 8 are provided on the inner surface of the concrete-filled steel pipe main column 1. To weld. This stiffening ring plate 8
It has the role of preventing the concrete 1b in the concrete-filled steel pipe main column 1 from shifting due to shearing of the steel pipe.

Next, a method for constructing a concrete-filled steel pipe truss bridge pier of the present invention will be described. 11 to 17
Shows the construction process. 18 and 19 are a plan view and a side view of an elevating stand used in the construction of the present invention. First, four vertical columns 12 were built in and fixed to the foundation concrete part 5 at the pier installation point, and the vertical columns 12 were installed.
The pedestal 13 is inserted from above and the elevating pedestal 11 is installed. As shown in FIG. 18 and FIG. 19, the elevating platform 11 is composed of four vertical columns 12 and a platform 13 that can be vertically moved up and down along the vertical columns, and the platform 13 is X-shaped. The two beams 13a, 13b arranged at
And a moving support mechanism 14 fixed to both ends of this beam. A semi-circular block pedestal 15 for supporting and clamping the horizontal beam 2 of the panel block 9 of the bridge pier, which will be described later, is provided on the upper side of each beam 13a, 13b. In addition, the movable support mechanisms 14 at both ends of the beam include movable clamps 14 a and 14 b capable of loosely fitting or gripping the vertical support columns 12 and a pedestal 13.
One on the lower side and one on the beam. The pedestal 13 is also connected by a connecting beam 13c. Of these, one end of a plurality of jacks 16 that extend and contract in the vertical direction is fixed to the upper movable clamp 14a, and the jack 1
The other end of 6 is fixed to the mount 13.

By the movement support mechanism 14 thus constructed, the pedestal 13 is vertically moved up and down along the vertical support column 12 by a combination of loose fitting of the upper and lower moving clamps 14a and 14b, a grasping operation and a stroke expanding and contracting operation of the jack 16. Alternatively, it can be stopped at a fixed position. The elevating platform 13 may be an elevating mechanism using a known means other than this example (for example, a winch or a rack and pinion system).

The procedure for manufacturing and assembling a steel pipe truss using the lifting platform 11 will be described below. (1) On the ground near the factory or the site, the horizontal beam 2 and the oblique beam 3 are welded and joined between the steel pipe main columns 1 of each block to manufacture a flat panel block 9 (see FIG. 11). (2) Two panel blocks 9 are built vertically in a predetermined position of the pier installation point so as to face each other, and the lower horizontal beam 2 is clamped to the block pedestal 15 of the elevator pedestal 11 (FIG. 12). reference). (3) Horizontal beam 2 and diagonal beam 3 between the facing surfaces of the panel block 9.
Are welded together to form a solid block 10. The ends of the horizontal beams 2 and the oblique beams 3 are adjusted and cut in advance at the factory (see FIG. 13). (4) The three-dimensional block 10 that has risen from the lift base 11 is lifted and held to a predetermined height, and a predetermined assembly space is formed below (see FIG. 14). (5) The steel pipe main of the three-dimensional block 10 in which the lower two panel blocks 9 manufactured in the same manner as in the above (1) are built in the assembly space, and the upper end of the steel pipe main column 1 is held by the lifting platform 11. It is joined to the lower end of the pillar 1 (see FIG. 15). (6) With the three-dimensional block 10 supported by the two panel blocks 9, the elevating platform 11 is lowered to the ground portion, and the lower horizontal beam 2 is clamped to the block pedestal 15 of the elevating platform 11 (see FIG. 16). . (7) The following steps (3) to (6) are repeated to complete a steel pipe truss having a predetermined height, and then concrete 1b is press-fitted into the steel pipe main column 1. This press-fitted concrete is concrete 1b with good fluidity such as superfluid concrete.
By using, you can push up concrete from below to fill the inside of the steel pipe. Through the above steps, the concrete-filled steel pipe truss bridge pier is completed (see FIG. 17).

Next, a detailed description will be given of the lifting / lowering stand according to the embodiment of the present invention. As shown in FIGS. 18 and 19, the elevating base 11 includes upper and lower clamps 14 above and below four vertical columns 12.
4 with 2 pairs of clamps, a and lower clamp 14b
It has a body hydraulic jack 16. To raise the pedestal 13, the lower clamp 14b of the lifting pedestal 11 is fixed to the vertical column 12, and the released upper clamp 14a is raised to the height of the stroke of the jack 16 by the hydraulic jack 16. Next, attach the upper clamp 14a to the vertical support 1.
The lower clamp 14b fixed to 2 and released is contracted by the hydraulic jack 16 by the stroke of the jack.

By repeating this, the lifting platform 11 can be raised to a required height. When lowering the elevating / lowering platform 11, the reverse procedure described above is performed. Further, the elevating platform and each of the blocks 10a to 10e fix the lowermost horizontal beam 2 of each block by the block pedestal 15 so as not to cause shake or shift. The lowermost horizontal beam 2 of each block is preferably provided with a reinforcing ring plate inside during processing in consideration of local deformation. The block pedestal 15 of the lifting / lowering platform 11 is of a detachable bolt type so that it can be moved because the width of the lowermost horizontal beam 2 of each block is different.

In the construction of the bridge pier of the concrete-filled steel pipe truss of the present invention, the plane assembly of the panel block is performed on the ground, and the three-dimensional assembly of the panel block is performed at a low place close to the ground. Therefore, as shown in FIGS. A prefabricated building or a windproof / snowproof facility 17 using a sheet can be installed in the building. By doing so, work can be performed without impairing the operation rate, quality, and safety even in the case of rough weather such as rainy weather, strong wind, or snowfall.

[0016]

The structure and construction method of a concrete-filled steel pipe truss pier of the present invention can obtain the following effects. (1) By filling the inside of the steel pipe with concrete, the composite cross section of the concrete and the steel pipe bears compressive stress, tensile stress, and bending stress, and the reinforcing bar can be omitted. Further, since the steel pipe is also used as a mold, the labor of assembling the reinforcing bar and the mold can be omitted. (2) Manufacture and assemble a three-dimensional truss block on the ground, and manufacture and assemble the lower three-dimensional block 10 in the lower assembling space lifted by the elevating pedestal.
After the steel pipe truss is completed by joining it to the steel pipe and sequentially extending it in the height direction, the steel pipe main column 1 is filled with concrete, so it can be constructed by working at a low place above the ground, and therefore it can The work of assembling and disassembling the formwork at a high place is not required, the process can be efficiently shortened, and dangerous work at a high place can be reduced. (3) An elevator platform is used to start the piers, and since the work is performed in a relatively low place, all-weather equipment can be installed and construction can be performed all year round. (4) Since the concrete is filled all at once after the completion of the start-up of the bridge pier, there is no need for a special curing period between each step as in the conventional case. (5) The structure of the concrete-filled steel pipe truss pier of the present invention can reduce its own weight as compared with the structure of the conventional concrete pier, and therefore the scale of the foundation is reduced as compared to the conventional concrete pier. It is more economical because you can.

[Brief description of drawings]

FIG. 1 is a front view showing an example of a concrete-filled steel pipe truss pier structure of the present invention.

FIG. 2 is a side view showing an example of a concrete-filled steel pipe truss pier structure of the present invention.

FIG. 3 is a partially cutaway sectional view of a steel pipe main column.

FIG. 4 is a partially longitudinal side view showing a steel pipe main column having a large number of ribs on its inner surface.

FIG. 5 is a side view, partly in vertical section, showing a state where concrete is filled in the main column of the steel pipe.

FIG. 6 is a partially longitudinal side view showing a joint between an upper end of a steel pipe main column and a superstructure.

FIG. 7 is a partially longitudinal side view showing a connecting portion between the lower portion and the substructure of the concrete-filled steel pipe truss pier of the present invention.

FIG. 8 is a partially longitudinal side view showing a relationship between a steel pipe main column having a slip stopper and a horizontal beam.

FIG. 9 is a partial vertical perspective view showing a rating portion of the present invention.

FIG. 10 is a cross-sectional plan view showing a graded portion of the present invention.

FIG. 11 is a perspective view showing a state where the present invention is carried out to assemble a frame unit.

FIG. 12 is a partially longitudinal side view showing a state where the first frame unit is assembled using the crane.

FIG. 13 is a partially longitudinal side view showing a state where a horizontal beam is attached using a crane.

FIG. 14 is a partial vertical cross-sectional side view showing a state where the solid block in the second row is assembled.

FIG. 15 is a partially longitudinal side view showing a state in which the assembling of the solid block in the second row has been completed.

FIG. 16 is a partially longitudinal side view showing a state in which the oblique beam is attached to the second solid block.

FIG. 17 is a partially longitudinal side view showing a state where the assembly of all the three-dimensional blocks is completed and the steel pipe main columns are filled with concrete.

FIG. 18 is a cross-sectional plan view of the lower frame.

FIG. 19 is a side view showing a lower frame.

FIG. 20 is a partially longitudinal side view showing a state in which a three-dimensional frame is being constructed.

[Explanation of symbols]

 1 Steel pipe main column 1a Rib 1b Filled concrete 2 Horizontal beam 3 Oblique beam 4 Superstructure (bridge girder) 4a Superstructure joint 4b Concrete 5 Substructure (foundation) 5a Substructure joint 6 Grade 7 Slip 8 Stiffening ring Plate 9 Panel block 10 Space block 11 Lifting platform 12 Vertical column 13 Platform 13a Beam 13b Beam 14 Moving support mechanism 15 Block cradle 16 Hydraulic jack 17 Wind / snowproof equipment

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazunori Tomono 5-9-1 Nishihashimoto, Sagamihara City, Kanagawa Pref., Nippon Steel Corporation Marine & Steel Division (72) Inventor Shigeki Mizukami Nishihashimoto, Sagamihara City, Kanagawa Prefecture 5-9-1 Nippon Steel Corporation, Steel Construction & Marine Division (72) Inventor Yoshiaki Imai 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation (72) Inventor Masaichi Horiguchi Tokyo 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Within Taisei Construction Co., Ltd. (72) Inventor Akihiko Mochizuki Within 1-25-1 Nishishinjuku, Shinjuku-ku, Tokyo Taisei Construction Co., Ltd. (72) Inventor Fumihide Hinata, Shinjuku Tokyo 1-25-1 Nishi-Shinjuku, Ward Taisei Construction Co., Ltd.

Claims (3)

[Claims] 1. A plurality of steel pipe main columns 1 having continuous ribs 1a on the inner side are erected at intervals, and the respective steel pipe main columns 1 are joined by a plurality of horizontal beams 2 and oblique beams 3 to form a steel pipe. Main pillar 1
Concrete in which a stiffening ring plate 8 is welded to the inside of the steel pipe main column 1 at the joint between the horizontal beam 2 and the oblique beam 3 and the steel pipe main column 1 is filled with concrete 1b. Filled steel pipe truss pier. 2. A horizontal beam 2 is provided between steel pipe main columns 1 on the ground near a factory or a site by installing a vertically movable pedestal 11 along a plurality of vertical columns 12 at a pier installation point.
And the slant beam 3 are joined together to produce a flat panel block 9, and the panel block 9 is vertically installed at a predetermined position of the pier installation point with the surfaces facing each other, and the lower part is clamped to the lifting platform 11. Then, the horizontal beams 2 and the oblique beams 3 are joined between the facing surfaces of the panel block 9 to form a solid block 10, and then the elevating / lowering platform 11 is raised to raise and hold the solid block 10 to a predetermined height. A predetermined assembling space is formed, the panel block 9 is built in the assembling space, and the upper end of the steel pipe main pillar 1 is joined to the lower end of the steel pipe main pillar 1 by the solid block 10 held by the elevating platform 11. Construction of a concrete-filled steel pipe truss pier characterized by filling the inside of the steel pipe main column 1 with concrete after lowering the elevating platform 11 to the ground part and repeating the above-mentioned operation to complete the steel pipe truss of a predetermined height Person . 3. The method for applying a concrete-filled steel pipe truss pier according to claim 2, wherein the lifting platform 11 is covered with a simple windproof and snowproof facility 17 capable of all-weather work.