JP3443617B2 - Preflex beam manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a preflex beam, and more particularly, to a plate girder having a camber.
er), or a method of simultaneously producing a large number of pre-flex beams used for simple beams or continuous beams by utilizing rolled steel without warping.

[0002]

2. Description of the Related Art A conventional technique will be described by taking a preflex beam used for a simple beam as an example. FIG. 1 is a diagram showing a manufacturing method of a straight type preflex beam for a simple beam which has been constructed for about 40 years,
1a is a front view and FIG. 1b is a plan view. After transporting the plate girders 10 to the site and making two sets as a set and placing them on the pre-flexion loading platform 2, approximately L / L from both ends of the plate girders that become the loading points of the pre-flexion load at the time of design. A supporting member (propping member) 9 is fixed at two positions of 5. Next, when the pre-reflection load is applied, the pre-reflection load is applied by providing the hydraulic jacks 4 at both ends of the plate girder, which are fulcrums in the design of the plate girder. Then, the pre-flex beam for a simple beam is manufactured by coating the lower flange of the plate girder with concrete by using the PS steel bar 5 while keeping the pre-reflection load applied.

However, in the conventional method of manufacturing a pre-flex beam as described above, when a pre-reflection load is applied to the plate girder, the plate girder is prevented from being laterally buckled. Lateral support device 1 arranged at regular intervals and fixing plate girders
2 should be provided. For this reason, it is necessary to separately provide a loading platform and a lateral support device for each set of pre-flex plate girders in the field, and to prevent lateral forces that may occur during the action of pre-reflection load 250m
Additional work is required, such as making concrete foundations of m or more. Therefore, not only is it necessary to secure a sufficient working space for this purpose, but since only two preflex beams are manufactured by one loading operation of the pre-reflection load, it takes a relatively long time for construction. Is
In particular, it is used only for the production of linear preflex beams.

[0004]

Accordingly, the present invention was devised to solve the problems of the prior art, and its purpose was to provide two or more linear and curved preflex beams. It is an object of the present invention to provide a method for manufacturing a pre-flex beam which is manufactured by one load loading operation.

Another object of the present invention is to provide a method of manufacturing a pre-flex beam which causes plastic deformation of a rolled steel without a warp so as to provide a designed warp. Still another object of the present invention is to provide a method for manufacturing a pre-flex beam for pile and column in which compressive stress is introduced into all of the concrete coated on both side flanges of rolled steel. is there.

[0006]

In order to achieve the above-mentioned object, a method of manufacturing a pre-flex beam using a plate girder with a sled as a first embodiment of the present invention is arranged above and below each other. First set of sled (camber)
The upper and lower plate girders are attached to the upper and lower plate girders of the first set at a fixed fulcrum.
The step of connecting using S steel bar (PS steelbar) and the upper and lower plate girders with the second set of sledges arranged on the upper and lower sides are provided, and the upper and lower plate girders of the second set are fixed at a fulcrum. Connecting using the PS steel bar, arranging the upper and lower plate girders of the first set and the upper and lower plate girders of the second set side by side at regular intervals, and the first and second sets A set of upper plate girders and a plurality of upper diaphragms of the first and second sets arranged at regular intervals.
agm) and lower diaphragms are used to connect to each other, a lower support is provided on each of the lower diaphragms, and an upper plate girder and a lower side of each set corresponding to the preload loading position. A hydraulic jack is provided between the plate girder and a step of applying a pre-reflection load to the upper and lower plate girders using the hydraulic jack, and an upper flange of each upper plate girder and a lower flange of the lower plate girder. And the step of coating the concrete.

In order to make a pre-flex beam for a simple beam application, the fixed fulcrum positions are located at both ends of the plate girder, and the pre-reflection load loading position is about L / L from both ends of the plate girder. Make it 5 Preflex beam to continuous beam (co
In order to make a use of an internal beam of the ntinuous beam, the positions of the fixed fulcrums are set to about L / 5 from both ends of the plate girder, and the loading position of the pre-reflection load is set to the plate girder. It should be about L / 3 from both ends.

In order to make a pre-flex beam for use as an external beam of a continuous beam, the positions of the fixed fulcrums are set to about L / 5 from one end and the other end of the plate girder, respectively. The loading position of the reflection load is approximately L from both ends of the plate girder.
/ 4 and L / 2. On the other hand, when the pre-flex beam is used for a simple beam application or a continuous beam inner beam outer beam application, when the length of the plate girder is 20 m or less, the lower support bases respectively have the pre-reflection load of 20 m or less. After the step of installing the lower support base so as to be provided at the loading position, a step of providing a plurality of upper support bases supporting the upper plate girder on the upper plate girder at the same position as the installation position of the lower support base. Including further.

When the length of the plate girder is in the range of 20 m to 30 m, the lower supports are arranged at three positions of 0.1 L and 0.5 from both ends of the lower plate girder. After the step of installing the lower support base, the method further includes providing a plurality of upper support bases supporting the upper plate girder on the upper plate girder at the same positions as the lower support bases. Plate girder length is 30m
In the above case, the lower supports may be installed at four places of 0.1L and 0.3L from both ends of the lower plate girder, and after the installation of the lower support, the upper plate girder may be installed. The method further includes the step of providing a plurality of upper supports for supporting the upper plate girder at the same positions as the lower supports.

Another method of making the pre-flex beam of the present invention using a sled plate girder is to provide a first set of sled upper and lower plate girders that are positioned one above the other, and one another. Providing the upper and lower plate girders with the second set of sleds arranged on the upper and lower sides, and the upper plate girders of the first and second sets and the lower plate girders of the first and second sets. Connecting each other using a plurality of upper diaphragms and lower diaphragms arranged at regular intervals, and providing a plurality of lower support bases laterally on each of the lower diaphragms,
A step of providing a supporting member at a fixed fulcrum above each of the lower plate girders, and a hydraulic jack on the upper part of the upper plate girder of each set or the lower part of the lower plate girder of each set corresponding to the loading position of the pre-reflection load. And firmly surrounding the upper plate girder and the lower plate girder of each set, and the hydraulic jacks using a square frame, and using the hydraulic jacks to pre-flex the plate girders of each set. Applying a suction load, and coating the lower flange of each of the adjacent upper plate girders and the upper flange of the lower plate girder with concrete.

The manufacturing method of the pre-flex beam according to this method is the same as the manufacturing method described above in which the square frame is not provided, and the PS steel bar selected based on the use of the simple beam or the continuous beam and the length of the plate girder. The position of the fulcrum and the loading position of the pre-reflection load are applied,
And the step of providing a plurality of upper supports can be added. Here, if a plurality of second set upper and lower plate girders arranged side by side with the first set upper and lower plate girders are formed, many pre-flex beams are manufactured by the action of one pre-reflection load. be able to.

As a second embodiment of the present invention, a method of manufacturing a pre-flex beam using a rolled shape steel without a warp is as follows. And a step of connecting the first set of upper and lower rolled shape steels using PS bars at a fixed fulcrum, and a second set of straight type rolled shape steels which are arranged on the upper and lower sides without warping. And connecting the second set of upper and lower rolled shaped steels with PS bars at a fixed fulcrum, and the first set of upper and lower rolled shaped steels and the second set of upper and lower rolled shaped steels at fixed intervals. And arranging them side by side, and a plurality of upper and lower rolled steel shapes of the first set and the second set and a plurality of lower rolled shape steels of the first and second sets are arranged at regular intervals. Connecting the upper and lower diaphragms to each other, The steps of providing the lower support base of the Fram, the hydraulic jack between each pair of upper rolled shape steel corresponding to loading position of the pre Deflection load and lower rolling shape steel provided,
Using the hydraulic jack to apply a pre-load to the upper and lower rolled steel bars to cause plastic deformation and warp, and to provide a supporting member at a fixed fulcrum above each of the lower rolled steel bars. And the PS provided at the fixed fulcrum
The step of removing the hydraulic jacks provided at the loading position of the steel bar and the pre-reflection load, and the upper rolling section of each set or the lower rolling section of each set corresponding to the loading position of the pre-reflection load. A step of providing a hydraulic jack on the lower part, a step of firmly surrounding the upper rolled section steel and the lower rolled section steel of each set by using a square frame, and a hydraulic jack, and each of the sets using the hydraulic jack. And a step of applying a pre-reflection load to the rolled shape steels, and a step of coating the lower flange of each of the adjacent upper rolled shape steels and the upper flange of the lower rolled shape steels with concrete.

The manufacturing method of the preflex beam according to the second embodiment is also selected according to the application of the simple beam or the continuous beam and the length of the rolled steel, like the manufacturing method of the preflex beam according to the first embodiment. P
The position of the fulcrum of the S steel bar and the loading position of the pre-reflection load are applied, and the step of providing a plurality of upper supports can be further added. Here, if a plurality of the second set of upper and lower rolled shape steels arranged side by side with the first set of upper and lower rolled shape steels are configured, a large number of pre-reflection loads are applied to increase the number of plates. It becomes possible to manufacture a flex beam.

As a third embodiment of the present invention, a method of manufacturing a preflex beam using a method of connecting dummy rolled shape steels to both ends of a rolled shape steel without a warp is a straight rolling shape steel without a warp. The step of connecting the dummy rolled shaped steels using bolts at both ends, and the first set of the rolled shaped steels consisting of a pair are arranged on the upper and lower sides, and both ends serving as fulcrums are PS
Connecting using steel bars and second pair consisting of other pairs
A step of arranging the rolled shaped steels in a set on the upper and lower sides and connecting both ends serving as fulcrums by using PS steel bars; and a pair of the upper and lower rolled shaped steels of the first set and a second set of upper and lower rolled shaped steels And arranging them side by side at regular intervals, and the upper rolled shaped steels of the first set and the second set and the lower rolled shaped steels of the first set and the second set are placed at regular intervals. A plurality of upper diaphragms and lower diaphragms are connected to each other; a lower support base for each lower diaphragm is provided; A hydraulic jack is provided between the steel bolt connection portion and the lower rolled shape steel bolt connection portion, and a step of applying a pre-reflection load to the upper and lower rolled shape steels by using the hydraulic jack, and the upper side Remaining rolled shape excluding dummy rolled shape steel from rolled shape steel The upper flange and the step of coating the lower flange of the remaining rolled shape steel excluding the dummy rolled shape steel from each of the lower rolled shape steel with concrete, and a supporting member at a fixed fulcrum at the upper part of each of the lower rolled shape steel. The stage of providing
Removing the PS steel bar and the hydraulic jack, providing a hydraulic jack on the bolt connection portion of the upper rolling section steel of each set or the lower rolling section steel of each set, and using a square frame Firmly surrounding the upper and lower rolled steel bars of each set, and the hydraulic jack, and applying a reflection load to the rolled steel bars of each group using the hydraulic jack; Coating the lower flange of the remaining rolled shape steel excluding the dummy rolled shape steel from each upper rolled shape steel and the upper flange of the remaining rolled shape steel excluding the dummy rolled shape steel from each of the lower rolled shape steel described above, and , Dismantling the dummy rolled steel bars connected to both ends of each of the rolled steel bars covered with concrete.

In the above embodiment, when compressive stress should be introduced into the abdominal concrete as well, the abdomen of the rolled shaped steel is covered with concrete and PC steel wires are inserted, and then a pretension method is applied. The pre-flex beam for piles and columns can be manufactured by further including the step of introducing compressive stress due to.

In addition, when the pre-flex beam to be manufactured has a certain length or more, the step of expanding the cross section of the connecting portion of each rolled shape steel to increase the rigidity and the grout for inserting the mating rolled shape steel. The pre-flex beam for piles and columns may further be manufactured by forming a grouting groove to bond the rolled steel bars to each other and injecting a grouting agent through the grouting groove.

In the second embodiment, when the length of the rolled shaped steel is 20 m or less, the lower support bases are respectively provided at the loading positions of the pre-reflection load, and the lower support bases are installed. After that, the pre-flex beam for piles and columns is manufactured further including a step of providing a plurality of upper support bases for supporting the upper rolled steel bars on the upper rolled steel bars at the same installation positions of the lower support steels. It

Further, the rolled shaped steel has a length of 20 m to 30.
In the case of the range of m, the lower supporting bases are respectively provided at three places of 0.1L and 0.5L from both ends of the lower rolling section steel, and after the installing stage of the lower supporting base, the upper rolling is performed. The pre-flex beam for piles and columns further includes a step of providing a plurality of upper support bases for supporting the shaped steels on the upper rolled shape steels at the same positions as the installation positions of the lower support bases.

Further, when the length of the rolled steel strip is 30 m or more, the lower support bases are provided at four positions of 0.1 L and 0.3 L from both ends of the lower rolled steel strip, respectively. After the step of installing the lower support, further including the step of providing a plurality of upper support for supporting the upper rolled section steel on the upper rolled section at the same position as the installation position of the lower support for piles and columns. Pre-flex beam is manufactured.

Also in this second embodiment, if a plurality of second sets of upper and lower rolled shape steels arranged side by side with the first set of upper and lower rolled shape steels are used, a single reflection load Many preflex beams can be produced by the action.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is a view for explaining a method of manufacturing a pre-flex beam for a simple beam, in which only a supporting base for a lower plate girder of the upper and lower plate girders provided with a sled according to the first embodiment of the present invention is provided. 2a is a front view, FIG. 2b is a plan view of a linear preflex beam when it is manufactured, and FIG.
Is a plan view of a curved preflex beam, and FIG. 2d is a side sectional view. Both ends, which are fulcrums, are connected and fixed with PS steel bar 5, and the deflection load (P)
First set of plate girders 10a, 10b that become loading points for
4 hydraulic jacks at two locations approximately L / 5 from both ends of
Is provided and the two plate girders 10a and 10b are loaded with a pre-reflection load (P) in such a manner that they spread each other. At this time, the other second set of plate girders 10a ', 10b'
And the third set of plate girders 10a "and 10b" are provided in the same manner, and the plate girders of each set are connected at regular intervals by using the diaphragm 7 to provide a pre-reflection load (P).
Prevents lateral buckling that can occur during loading. The three or more sets of plate girders thus made are placed on the tripod-shaped support bases 6 provided at both ends serving as fulcrums through the diaphragm 7 and subjected to the above-described load-loading work and then the upper side. Upper flanges such as plate girders 10a, 10a ', 10a "and lower plate girders 10b, 10b', 1
The 0b ″ lower flange is coated with concrete to produce a preflex beam for simple beams.

FIG. 3 shows a method of manufacturing a pre-flex beam for an inner beam having a continuous beam structure using only the support of the lower plate girder according to the first embodiment of the present invention. Is a plan view of a straight preflex beam, FIG. 3c is a plan view of a curved preflex beam, and FIG. 3d is a side sectional view.
A still girder that becomes the loading point of the pre-reflection load (P) after the first set of plate girders 10a and 10b are fixed so as to be connected by the PS steel bar 5 at a position that is approximately L / 5 from both ends that are fulcrums A hydraulic jack 4 is provided at each of two positions which are approximately L / 3 from both ends to load the deflection load (P). At this time, the other second set of plate girders 10a ', 10b' and the third set of plate girders 1
0a ″ and 10b ″ are provided in the same manner, and the diaphragm 7 is used to connect the plate girders of each set at regular intervals to prevent lateral buckling that may occur when the pre-reflection load (P) is loaded. The three or more sets of plate girders thus formed are placed through the diaphragm 7 on the tripod-shaped support base 6 provided at about L / 5 positions from both ends serving as fulcrums, and the load as described above is set. A pre-flex beam for an inner beam of a continuous beam by performing a loading operation and coating the upper flanges of the upper plate girders 10a, 10a ', 10a "and the lower flanges of the lower plate girders 10b, 10b', 10b" with concrete. Is produced.

FIG. 4 shows a method of manufacturing a preflex beam for an outer beam having a continuous beam structure using only the support of the lower plate girder according to the first embodiment of the present invention. Is a plan view of a straight preflex beam during fabrication, FIG. 4c is a plan view of a curved preflex beam during fabrication, and FIG. 4d is a side sectional view. After the first set of plate girders 10a, 10b are connected and fixed with PS steel bar at a position of about L / 5 from the end opposite to the end serving as a fulcrum, it becomes a loading point of the pre-reflection load (P). A hydraulic jack 4 is provided at each of two positions, ie, the L / 4 position and the L / 2 position from the end of the plate girder, and a pre-reflection load (P) is applied thereto. At this time, the other second set of plate girders 10a ′ and 10b ′ and the third set of plate girders 10a ″ and 10b ″ are provided in the same manner, and the diaphragm 7 is used to connect the plate girders of each set at regular intervals. This prevents lateral buckling that may occur when the pre-reflection load (P) is loaded. The three or more sets of plate girders thus made are placed on the tripod-shaped support base 6 provided at the fulcrum through the diaphragm 7, and the upper plate is subjected to the load loading work as described above. Upper flange of girders 10a, 10a ', 10a "and lower plate girders 10b, 10b', 10
By coating the bottom flange of b "with concrete,
A preflex beam for the outer beam of the continuous beam is produced.

FIG. 5 shows a method of manufacturing a pre-flex beam for a simple beam using a support provided on both upper and lower plate girders according to the first embodiment of the present invention.
5a is a front view, FIG. 5b is a plan view when manufacturing a linear preflex beam, FIG. 5c is a plan view when manufacturing a curved preflex beam, and FIG. 5d is a side sectional view. In order to minimize the influence of the plate girder's own weight and eliminate the risk of safety accident, the upper plate girder 10a,
A rigid frame (Rigid Frame) -shaped support base 3 for supporting 10a 'and a tripod-shaped support base 6 for supporting the lower plate girders 10b, 10b' are set at 0.1L positions from both ends of the whole plate girder. It is installed at three places of 0.5L position.

At this time, when the length of the pre-flex beam to be manufactured is short, these support bases can be provided at two places, and when it is long, these support bases can be provided. The upper plate girders 10a and 10a ', which are laterally connected using the diaphragm 7 for preventing lateral buckling, are mounted on the ramen-shaped support base 3 thus provided, and on the tripod-shaped support base 6. Similarly, the lower plate girders 10b and 10b ', which are horizontally connected using the diaphragm 7, are placed (see FIG. 5d). After that, the upper and lower plate girders are connected to both ends of the plate girder, which is a fulcrum in design, by using PS steel bar 5, and about L / 5 from both ends of the plate girder, which is a loading point of the reflection load (P). The hydraulic jacks 4 are provided between the upper and lower plate girders at the two positions, and the pre-reflection load (P) is loaded so as to spread the two sets of plate girders.
Upper flange and lower plate girders 10b, 10b '
A preflex beam for simple beams is manufactured by coating the lower flange of the with concrete.

FIG. 6 shows a method of manufacturing a preflex beam for an inner beam using a support table provided on both upper and lower still girders in a continuous beam structure according to the first embodiment of the present invention, and FIG. Fig. 6b is a plan view of a linear preflex beam, Fig. 6c is a plan view of a curved preflex beam, and Fig. 6d.
FIG. A ramen-shaped support base 3 and lower plate girders 10b, 10b 'for supporting the upper plate girders 10a, 10a' in order to minimize the influence of the weight of the plate girders and eliminate the risk of safety accidents.
All of the tripod-shaped support bases 6 for supporting the plate girders are provided at three positions of 0.1 L position and 0.5 L position from both ends of the plate girder.

At this time, when the length of the pre-flex beam to be manufactured is short, these support bases can be provided at two places, and when it is long, these support bases can be provided at four places. The upper plate girders 10a and 10a ', which are laterally connected using the diaphragm 7 for preventing lateral buckling, are mounted on the ramen-shaped support base 3 thus provided, and on the tripod-shaped support base 6. Similarly, the diaphragm 7 is used to place the lower plate girders 10b and 10b 'which are horizontally connected (see FIG. 6d).
After that, the PS plate steel 5 is used to connect the upper and lower plate girders to a position that is about L / 5 from both ends of the plate girder, which is a fulcrum in design, and becomes a loading point of the pre-reflection load (P). , A pre-reflection load (P) is applied by expanding the two sets of plate girders by providing hydraulic jacks 4 between the two upper and lower plate girders located at approximately L / 3 positions from both ends of the plate girder, A preflex beam for a continuous beam is produced by coating the upper flanges of the upper plate girders 10a and 10a 'and the lower flanges of the lower plate girders 10b and 10b' with concrete.

FIG. 7 shows a method of manufacturing a pre-flex beam for an outer beam using a support provided on both upper and lower plate girders in a continuous beam structure according to the first embodiment of the present invention. Front view, FIG. 7b is a plan view when manufacturing a linear preflex beam, FIG. 7c is a plan view when manufacturing a curved preflex beam, and FIG.
d is a side sectional view. Again, in order to minimize the influence of the plate girder's own weight and eliminate the risk of a safety accident, a rigid frame type support stand 3 for supporting the upper plate girders 10a, 10a 'and the lower plate girders 10b, 10b. 'Supporting tripod for supporting 6
From the both ends of the whole plate girder at 0.1 L position and 0.
It will be installed at three locations that will be 5L.

At this time, when the length of the pre-flex beam to be manufactured is short, these support bases can be provided at two places, and when it is long, these support bases can be provided. The upper plate girders 10a and 10a ', which are laterally connected using the diaphragm 7 for preventing lateral buckling, are mounted on the ramen-shaped support base 3 thus provided, and on the tripod-shaped support base 6. Similarly, the diaphragm 7 is used to place the lower plate girders 10b and 10b 'connected laterally (see FIG. 7d). After that, PS at the end of the plate girder, which is the fulcrum in design, and at a position about L / 5 from the end of the plate girder.
The upper and lower plate girders are connected using the steel bar 5 to become the loading point for the pre-reflection load (P), and the upper and lower parts are located at about L / 4 position and about L / 2 from the end of the plate girder, respectively. A hydraulic jack 4 is provided between the side plate girders to spread the two sets of plate girders, and the pre-reflection load (P) is applied to the upper plate girders 10a, 10a.
a'upper flange and lower plate girders 10b, 10
By coating the bottom flange of b'with concrete,
A preflex beam for the outer beam of the continuous beam is produced.

The manufacturing method shown in FIGS. 2 to 7 is as follows.
If a lateral support device for preventing lateral buckling is provided separately without using a diaphragm, one set of plate girders, that is, two preflex beams can be manufactured.
It is also possible to connect more than one set of straight and curved shape steels laterally using a diaphragm and simultaneously manufacture four or more straight and curved preflex beams. Continuing,
A method for manufacturing a preflex beam for piles and columns in which a compressive stress is introduced into both a preflex beam using a rolled steel without warping and a double-sided flange concrete will be described.

The above-mentioned prior art manufacturing method is such that the rolled section steel without a warp is plastically deformed to have a warp, or the rolled section steel is placed on a loading table in order to introduce compressive stress to both side flange concretes. After carrying out the load loading work once, the rolled shaped steel must be separated from the loading platform again, turned upside down, and set again, and then the load loading work must be performed again, which causes considerable trouble in the work. . Therefore, the loading method described below is intended to eliminate such trouble.

The manufacturing method will be described below with reference to the drawings using a simple beam as an example. Figure 8a
Is a front view, FIG. 8b is a plan view when manufacturing a linear preflex beam, FIG. 8c is a plan view when manufacturing a curved preflex beam, and FIG. 8d is a side sectional view. In order to minimize the influence of the rolled shape steel due to its own weight and to eliminate the risk of safety accidents, a ramen-shaped support base 3 for supporting the upper rolled shape steels 10a and 10a 'and lower rolled shape steels 10b and 10b.
Tripod-shaped support bases 6 for supporting b ′ are provided at three positions, 0.1 L position and 0.5 L position, from both ends of the overall rolled shape steel.

At this time, when the length of the pre-flex beam to be manufactured is short, these support bases can be provided at two places, and when it is long, these support bases can be provided. Using the diaphragm 7 provided to prevent lateral buckling at the time of load loading, one set or multiple sets of rolled shaped steels are laterally connected, and the upper rolled shaped steels 10a and 10a 'are mounted on the ramen-shaped support base 3. Then, the lower rolled steel shapes 10b and 10b 'are mounted on the tripod-shaped support base 6 through the diaphragm 7 (see FIG. 8d). After that, support members 9 are provided between the upper and lower rolled steel bars at both ends of the rolled steel bars which are design fulcrums, and the both ends of the rolled steel bars become the loading points of the pre-reflection load (P). About L / 5
Position the hydraulic jacks 4 at each of the two positions,
The pre-reflection load (P) is applied in a form of being provided on the upper part of 0a and 10a 'and surrounding all of them with a square frame 8 to shrink the rolled shaped steel. Here, the installation position of the hydraulic jack 4 can also be provided in the lower part of the lower rolled section steel based on site conditions.

The theory for plastic deformation of the material characteristics of the steel material when manufacturing the pre-flex beam using the rolled shape steel without warping according to the present invention will be described with reference to the graph of FIG. 9 as follows. Is. The graph of Figure 9a is a stress-deformation diagram for a typical structural steel under tension. The deformation rate is shown on the horizontal axis and the stress is shown on the vertical axis. As shown in the graph, from point O to point A is a straight line, but in this region, the stress and the deformation rate are proportional, and the behavior of the material is called linear.
Moreover, the linear relationship between the stress and the deformation rate is no longer maintained beyond point A, but at this time point A is a proportional limit (proportion limit).
al limit).

If the load is gradually increased beyond the proportional limit, the deformation rate increases much more rapidly than the stress, and the stress-deformation curve becomes a point where the slope becomes gradually smaller and then becomes horizontal. You will reach B. From point B to point C, considerable deformation occurs even if the tensile force hardly increases. This phenomenon is called yielding of material, and
The stress at a point is called the yield stress or the yield point. Then, in the region from the point B to the point C, the material is in a perfectly plastic state and deformation occurs even if the applied load does not increase. After a large deformation rate occurs in the yielding process in the BC region, strain hardening begins, in which the material undergoes changes in its atomic and crystalline structure, increasing the material's resistance to further deformation.

Therefore, only when the tensile force increases, additional extension occurs, and the stress-deformation rate diagram has a positive inclination from the point C to the point D. That is, the load eventually reaches the maximum value, and the stress at this time is the ultimate stress (ultimate s
tress). In addition, if the load is reduced beyond this point, the material will continue to increase and fracture at point E (fractu
re) occurs.

FIG. 9b is a simplified graph showing the stress-deformation rate diagram of FIG. 9a. A material is said to be elastic and behave linearly if the deformation caused by the applied load disappears when the load is removed. However, if the yield point is reached, the stress and deformation rate will linearly decrease along the line CD parallel to the straight line portion AB of the load curve when yield occurs and the load is removed as described above. The fact that the deformation rate does not return to 0 after the load is removed indicates that the material has undergone permanent or plastic deformation. In FIG. 9b, the AD section represents the residual deformation value due to plastic deformation.

Therefore, in the method of manufacturing the pre-flex beam according to the present invention, most of the manufacturing methods used at present have a steel girder considering only the elasticity of the material.
Unlike the conventional method in which a warp corresponding to sagging due to dead load was attached in advance to withstand the difficulty and troublesomeness in manufacturing, the warped rolled steel without a warp was subjected to a predetermined process and a plastic warpage caused by plastic deformation. I tried to attach.

The manufacturing process of the pre-flex beam using the rolled shape steel without warping according to the present invention will be described below with reference to the drawings. FIG. 10 is a one-step process for producing a pre-flex beam using a simple beam rolled shape steel, and shows a process in which a rolled shape steel without a warp is provided with a warp corresponding to sagging due to dead load. At this time, the method of loading the load for attaching the sled follows the method of FIG. 2 or FIG.

FIG. 10b shows two loads (P) at the positions of about ⅕ L from both ends of the non-sled rolled shaped steel (FIG. 10a) placed on a fulcrum having a fulcrum condition such as a simple beam structure. A step of causing a plastic deformation in the form of a third parabola having an apex at the position where the maximum bending moment occurs, that is, in the center of the rolled steel, when a dead load is applied by applying the material beyond the elastic range is shown. At this time, the shape of the parabola can be easily induced to a tertiary parabolic type according to the size of dead load and live load and the use of the structure. FIG. 10c is a perspective view of rolled steel that has been plastically deformed into a third parabolic form from the above process.

FIG. 11 shows a process of introducing a compressive stress into concrete by the loading method using the square frame as shown in FIG. 8 for the plastically deformed rolled steel manufactured in the process of FIG. FIG. 11b shows a state in which two loads (P) are applied to the upper flange of the rolled section steel at a position of about ⅕ L from both ends of the rolled section steel which is covered with concrete to introduce compressive stress. .

FIG. 11c shows a state in which the upper flange of the rolled shape steel is covered with concrete in the state where two loads are applied to the rolled shape steel. FIG. 11d shows a state in which the load applied after the upper concrete is cured is converted into a pre-flex beam in which a compressive stress that is opposite to the stress generated by the dead load and the live load is introduced.

FIG. 12 is a beam positioned at the left and right edges of a continuous beam structure, which uses rolled steel having a fulcrum at the left end and the right end at about 1/5 L from the end. Fig. 2 shows a process for forming a pre-flex beam in a one-step process in which a non-warped rolled steel section is provided with a warp corresponding to sagging due to dead load of an outer beam of a continuous beam structure. At this time, the load loading method for attaching the sled follows the method of FIG. 4 or 7.

FIG. 12a shows a rolled steel without a warp, in which a left end is located at the end and a right end is provided with a fulcrum at a position of about 1/5 L from the end. FIG. 12b shows a position at which the maximum bending moment is generated when a dead load is applied, that is, from the left end by applying two loads (P) beyond the elastic range at intervals of about 1/4 L from the left end of the rolled steel. The process which produces | generates the plastic deformation of the 3rd parabolic form which has an apex in a 3 / 8L position is shown. At this time, the shape of the parabola can be easily guided to the third parabolic type depending on the size of dead load and live load and the use of the structure. FIG. 12c is a perspective view of rolled steel that has been plastically deformed into a third parabolic form from the above-described process.

FIG. 13 shows a process of introducing a compressive stress into concrete based on a loading method using a square frame for the plastically deformed rolled steel manufactured in the process of FIG. FIG. 13b shows a state in which two loads (P) are applied at intervals of about 1/4 L from the left end of the rolled rolled steel to cover the upper flange of the rolled steel with concrete and to introduce compressive stress.

FIG. 13c is a state diagram in which the upper flange of the rolled steel is covered with concrete in the state where two loads (P) are applied to the rolled steel. FIG. 13d is a state in which the load (P) applied after the upper concrete has been cured is removed to convert it into a preflex beam in which a compressive stress that is opposite to the stress generated by the dead load and the live load is introduced. . At this time, it can be seen that the upper concrete outside the right fulcrum is in a stress-free state.

FIG. 14 shows a beam located inside in a continuous beam structure or a beam connecting columns in a building structure, which uses rolled steel having fulcrums at about 1/5 L positions from both ends. FIG. 2 shows a process of manufacturing a pre-flex beam, which is a one-step process, in which a rolled shape steel without a warp is provided with a warp corresponding to the sag of the inner beam of the continuous beam structure due to the dead load. At this time, the load loading method for attaching the sled follows the method of FIG. 3 or FIG.

FIG. 14a shows an inner beam in a continuous beam structure or a beam used to connect columns in a building structure, about 1/5 from both ends.
It shows a rolled steel without a warp with a fulcrum at the L position. At this time, in the case of a continuous beam structure, the inner beam may be made longer than the outer beam by about 25% to improve economic efficiency.

FIG. 14b shows about 1 point left and right from the center of the rolled steel.
It shows a process of generating plastic deformation in the form of a third parabola obtained by applying two loads (P) to the fulcrum that becomes / 6L above the elastic limit. At this time, the shape of the parabola depends on the size of dead load and live load and the use of the structure.
It can be easily guided to the next parabolic type. FIG. 14c is a perspective view of the rolled steel that has been plastically deformed into the third parabolic form from the above process.

FIG. 15 is a view showing a manufacturing process of an inner beam in a continuous beam or a pre-flex beam using rolled steel for connecting columns in a building structure. FIG. 15a shows about 1 to the left and right of the center of the rolled shape steel for introducing compressive stress into the concrete covered by the upper flange of the downwardly plastically deformed rolled shape steel shown in FIG. 14c.
It shows a state in which a load (P) is applied to two fulcrums of / 6L (see FIG. 15b). A square frame is also used for the load loading method at this time.

FIG. 15c shows a state in which the upper flange of the rolled steel is covered with concrete under the condition that two loads (P) are applied. FIG. 15d shows a state in which the load (P) applied after the upper concrete has been cured is removed to convert it into a pre-flex beam in which a compressive stress that is contrary to the stress generated by the dead load and the live load is introduced. .
At this time, it can be seen that the upper concrete outside the fulcrums at both ends is in a stress-free state.

Next, a process of manufacturing a preflex beam for piles and columns in which a compressive stress is introduced into all of the concrete coated on both side flanges by an applied method using a preflex beam will be described. The pile is for reliably transmitting the load acting on the upper structure and the lower structure to the ground, and is mechanically stable and should not cause harmful displacement. However, due to the structure of conventional piles, lateral displacement may be induced by lateral loads, earthquakes, etc., which weakens the bearing capacity. Also, since a large number of piles are required to secure sufficient bearing capacity, not only is the construction cost considerable, but when the piles are long, there are restrictions on construction due to weakening of the rigidity of the connecting part. It was Further, in the case of steel piles, the strength reduction due to corrosion was a big disadvantage.

Therefore, in this applied method, in order to improve the problems of the existing pile, the rolled shaped steel is coated with concrete, and the pre-stressed compressive stress is introduced over the entire cross section to improve the flexural rigidity. As a result, it is possible to resist lateral load and seismic force and prevent corrosion, and to increase the bearing force by increasing the skin friction force due to the sectional shape of the rolled steel. Due to the high rigidity, the required bearing capacity can be obtained with a far smaller number of piles than existing piles. Further, in the case of a column, the effect of increasing the bending rigidity can be obtained by reducing the sectional area of the column having a large moment. This applied construction method is presented in FIGS. 16 to 19.

FIG. 16a is a state diagram in which the dummy rolled shaped steel 11 is connected by a connecting member 20 using bolts in order to manufacture a preflex beam for piles and columns in which uniform compressive stress is introduced into concrete of all sections. Is. The rolled shaped steels thus connected are placed on a loading table and placed at about L / L from the rear end as in the manufacturing method shown in FIG. 2 or 5.
After applying the load (P) to the fulcrum of 5 (see FIG. 16b),
The upper flange of the upper rolled section steel and the lower flange of the lower rolled section steel are coated with concrete (see Fig. 16c).

FIG. 16d shows the process of removing the applied load (P) and introducing compressive stress into the coated concrete. 16e is similar to the load loading method shown in FIG.
A state where a load (P) is applied in the opposite direction using a square frame is shown. At this time, all flanges of the upper and lower rolled section steels are covered with concrete, and a predetermined number of diaphragms may be provided by ensuring rigidity in the lateral direction.

FIG. 16f is a view showing a state in which concrete is coated on the lower flange of the rolled shape steel and the upper flange of the lower rolled shape steel under the load (P). Figure 16g shows the load (P) after the concrete is cured.
A process of removing the dummy rolled steel 11 and the connecting member 20 and introducing compressive stress into the second coated concrete will be described. When compressive stress should be introduced into the abdominal concrete, PC steel wire (PC
Insert steel wires) and pre-tension (pre-tensio
n) by applying compressive stress by the method (Fig. 17).
It is possible to manufacture pre-flex beams for piles and columns in which stress is introduced over the entire cross section.

Through the above-described process, it is possible to mass-produce the pre-flex beam for piles and columns, which is excellent in performance having a constant compressive stress over the entire cross section. Also, the required length can be arbitrarily adjusted through connecting and cutting. 18a and 18b are perspective views showing a pre-flex beam for piles and a pre-flex beam for columns, in which a compressive force is introduced into concrete having a full cross section. In the case of a pre-flex beam for piles, a wedge-shaped concrete cap is additionally cured to reduce damage and friction at the tip when driving a pile (see FIG. 18a).

FIG. 19 shows a method in which the preflex beam for piles can be connected without lowering the strength when the depth of penetration is long and a connecting portion is required. The connecting part has an enlarged cross-section to reduce rigidity, and a socket type groove into which rolled steel is inserted is made to join the pre-flex beam for piles and columns, and a groove for injecting grouting material is made to make a complete joint. Plan.

[0059]

As described above, according to the present invention, the lower plate girder or the tripod-shaped support base for supporting only the rolled steel is provided at a position serving as a fulcrum by design, and it is placed through the diaphragm or the upper and lower sides. If all plate girders or rolled steel are to be supported, a ramen-shaped support and a tripod-shaped support are provided at two locations if the preflex beam is short, and at three or four locations if it is long. , The upper plate girder or rolled section steel is mounted on the rigid frame type support, and the lower plate girder or rolled section steel is mounted on the tripod type support through the diaphragm, and the pre-flex beam for pre-reflection load loading is manufactured. That is the method. According to the manufacturing method of the present invention, it is possible to manufacture two or more, that is, a large amount of linear and curved preflex beams by one pre-reflection operation. Therefore, the construction period can be significantly shortened.

By using a method of applying a load in the form of contracting the upper and lower plate girders or the rolled steel bars by further providing a square frame, a preflex beam using rolled steel bars without warping is manufactured. , It is possible to eliminate the difficulty and troublesomeness of attaching a sled corresponding to sagging due to a dead load when manufacturing the pre-flex beam.

Further, by manufacturing pre-flex beams for piles and columns in which compressive stress is introduced into all cross-section concrete, in the case of pre-flex beams for piles, flexural rigidity is improved to resist lateral load and seismic force. In addition, corrosion can be prevented, and the supporting force can be increased by increasing the frictional force on the peripheral surface due to the sectional shape of the rolled steel. In addition, the high stiffness provides the required bearing capacity with far fewer piles than existing piles. Further, in the case of the column pre-flex beam, a cross-section saving effect is obtained in the column to which a large moment acts due to an increase in flexural rigidity.

[Brief description of drawings]

FIG. 1 is a diagram shown for explaining a method of manufacturing a preflex beam for a simple beam according to the prior art, in which a is a front view and b is a plan view.

2A and 2B are views for explaining a method of manufacturing a pre-flex beam for a simple beam in which a lower plate girder is provided with a support according to the present invention, where a is a front view of the plate girder and b is a linear shape. FIG. 5 is a plan view of the plate girder, c is a plan view of the curved plate girder, and d is a side sectional view of the plate girder.

FIG. 3 is a view for explaining a method of manufacturing a pre-flex beam for an inner beam of a continuous beam in which a lower plate girder is provided with a support according to the present invention, a is a front view of the plate girder, and b is a front view. Is a plan view for a linear plate girder, c is a plan view for a curved plate girder, and d is a side sectional view for a plate girder.

FIG. 4 is a view for explaining a method of manufacturing a pre-flex beam for an outer beam of a continuous beam in which a support is provided on a lower plate girder according to the present invention, a is a front view of the plate girder, and b is a front view. Is a plan view for a linear plate girder, c is a plan view for a curved plate girder, and d is a side sectional view for a plate girder.

FIG. 5 is a view for explaining a method of manufacturing a preflex beam for a simple beam in which upper and lower plate girders are provided with a support according to the present invention, a is a front view of the plate girder, and b Is a plan view for a linear plate girder, c is a plan view for a curved plate girder, and d is a side sectional view for a plate girder.

FIG. 6 is a view for explaining a method for manufacturing a preflex beam for an inner beam of a continuous beam in which upper and lower plate girders are provided with a support according to the present invention, and a is a front surface of the plate girder. Figure, b is a plan view for a linear plate girder, c is a plan view for a curved plate girder, and d is a side sectional view for a plate girder.

FIG. 7 is a view for explaining a method of manufacturing a pre-flex beam for an outer beam of a continuous beam in which upper and lower plate girders are provided with supports according to the present invention, and a is a front surface of the plate girder. Figure, b is a plan view for a linear plate girder, c is a plan view for a curved plate girder, and d is a side sectional view for a plate girder.

8A and 8B are views for explaining a method for manufacturing a preflex beam for a simple beam having a square frame according to the present invention, in which a is a front view of a plate girder and b is a plan view of a linear plate girder. , C is a plan view for a curved plate girder, and d is a side sectional view for the plate girder.

9A is a stress-deformation rate diagram showing a deformation rate of a typical structural steel due to the action of tensile stress in a graph, and FIG. 9B is a diagram simply showing FIG. 9A.

FIG. 10 is a view showing a process of causing plastic deformation of rolled steel for a simple beam without a warp used for manufacturing a preflex beam according to the present invention, where a is a warp; A rolled section without a bar, b the step of loading the rolled section, and c
FIG. 4 is a diagram showing a rolled steel that is plastically deformed into a tertiary parabolic form.

FIG. 11 is a diagram showing a process of manufacturing a pre-flex beam using the rolled shaped steel of FIG. 10c, in which a is a plastically deformed rolled shaped steel for simple beam and b is a rolled shaped steel. FIG. 3 is a view showing a step of applying a load, c is a step of coating the upper flange of the rolled steel with concrete, and d is a state in which the rolled steel has been converted into a preflex beam.

FIG. 12 is a view showing a process of causing plastic deformation in a rolled beam for outer beam of a continuous beam without a warp used for manufacturing a preflex beam according to the present invention, where a is a warp; [Fig. 3] Fig. 3 is a view showing an unrolled shape steel, b showing a step of applying a load to the rolled shape steel, and c showing a rolled shape steel plastically deformed into a third parabolic form.

FIG. 13 is a diagram showing a process of manufacturing a pre-flex beam using the rolled shape steel of FIG. 12c, wherein a is a plastically deformed continuous beam outer shape rolled shape steel, and b is
FIG. 4 is a diagram showing a step of applying a load to the rolled shape steel, a step of coating the upper flange of the rolled shape steel with concrete, and a state of converting the rolled shape steel into a pre-flex beam.

FIG. 14 is a view showing a process of causing plastic deformation in a rolled steel for a continuous beam without a warp or for an inner beam of a continuous beam used for manufacturing a preflex beam according to the present invention. , A is a rolled shape steel without warping, b is a step of applying a load to the rolled shape steel,
And c is the figure which showed the rolled shape steel plastically deformed to the tertiary parabolic form.

FIG. 15 is a view showing a process of manufacturing a pre-flex beam using the rolled shape steel of FIG. 14c, wherein a is a rolled shape steel for an inner beam of a plastically deformed continuous beam or for a building structure. FIG. 3b is a view showing a step of applying a load to the rolled steel, c is a step of coating the upper flange of the rolled steel with concrete, and d is a state in which the rolled steel is converted into a preflex beam. Is.

FIG. 16 is a diagram showing a process of manufacturing a pre-flex beam for piles and columns according to the present invention, wherein a is a step of connecting dummy rolled shaped steels to both ends of the rolled shaped steels;
Is a step of applying a load to one side of the rolled steel, c is a step of coating the lower flange of the rolled steel with concrete, d is a step of removing the load acting on the rolled steel, e
Is the step of applying a load to the opposite side of the rolled steel, f is the step of coating the upper flange of the rolled steel with concrete,
Further, g is a diagram showing a step of removing the load acting on the rolled steel shapes and dismantling the connection of the dummy rolled steel shapes.

FIG. 17 is a view showing a method of introducing compressive stress to abdominal concrete of rolled steel according to the present invention.

18A is a perspective view showing a preflex beam for piles manufactured by the present invention, and FIG. 18B is a perspective view showing a preflex beam for columns.

FIG. 19 is a detailed view of a preflex beam connecting portion for piles and columns according to the present invention.

[Explanation of symbols]

2 loading platform 3 Upper support 4 hydraulic jack 5 PS steel bar 6 Lower support 7 diaphragm 8 square frame 9 Support members 10 Plate girder (rolled steel) 11 Dummy rolled steel 20 Connection member

─────────────────────────────────────────────────── --Continued from the front page (31) Priority claim number 200022034 (32) Priority date April 25, 2000 (April 25, 2000) (33) Priority claiming country Korea (KR) (31) Priority Claim number 200039748 (32) Priority date July 11, 2000 (July 11, 2000) (33) Priority claiming country Korea (KR) (31) Priority claim number 200011805 (32) Priority date 2000 25th (April 25, 2000) (33) Priority claim countries South Korea (KR) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04C 3/293 E04B 1/30

Claims (29)

(57) [Claims] 1. A step of providing upper and lower plate girders having a first set of sleds arranged on the upper and lower sides of each other, and connecting the upper and lower plate girders of the first set at a fixed fulcrum using PS steel bars, Providing upper and lower plate girders with a second set of sledges arranged on the upper and lower sides, and connecting the upper and lower plate girders of the second set at a fixed fulcrum using the PS steel bar; Arranging one set of upper and lower plate girders and a second set of upper and lower plate girders in parallel at regular intervals; and the first and second upper plate girders and the first set
Connecting the lower plate girders of the first set and the second set to each other using a plurality of upper diaphragms and lower diaphragms arranged at regular intervals, and providing a lower support base on each of the lower diaphragms Step, and install a hydraulic jack between the upper plate girder and the lower plate girder of each set corresponding to the loading position of the pre-reflection load, and use the hydraulic jack to apply the pre-reflection load to the upper and lower plate girders. And a step of coating the upper plunge of each upper plate girder and the lower flange of the lower plate girder with concrete. 2. In order to use as a simple beam, the fixed fulcrum is positioned at both ends of the plate girder, and the loading position of the pre-reflection load is about L / 5 from both ends of the plate girder. The method for manufacturing a preflex beam according to claim 1, wherein 3. In order to use as an inner beam of a continuous beam, the position of the fixed fulcrum is set to about L / 5 from both ends of the plate girder, and the loading position of the pre-reflection load is set to both ends of the plate girder. To about L / 3, the manufacturing method of the pre-flex beam according to claim 1. 4. In order to use as an outer beam of a continuous beam, the positions of the fixed fulcrums are set to about L / 5 from one end of the plate girder opposite to one end thereof, and the pre-reflection load is applied. The method of manufacturing a pre-flex beam according to claim 1, wherein the positions are about L / 4 and L / 2 from both ends of the plate girder. 5. When the length of the plate girder is 20 m or less, the lower supports are respectively provided at the loading positions of the pre-reflection load, and the upper plate girder is installed after the installation of the lower supports. The preflex according to any one of claims 2 to 4, further comprising the step of providing a plurality of upper support bases supporting the same on the upper plate girder at the same installation position as the lower support bases. Beam manufacturing method. 6. The plate girder has a length of 20 m to 3
In the case of the range of 0 m, the lower supports are provided at three places, 0.1L and 0.5L respectively from both ends of the lower plate girder, and after the installation of the lower support, the upper plate girder is installed. The preflex according to any one of claims 2 to 4, further comprising the step of providing a plurality of upper support bases supporting the same on the upper plate girder at the same installation position as the lower support bases. Beam manufacturing method. 7. When the length of the plate girder is 30 m or more, the lower support bases are provided at four positions of 0.1 L and 0.3 L from both ends of the lower plate girder, respectively. 3. The method according to claim 2, further comprising a step of providing a plurality of upper supporters supporting the upper plate girder on the upper plate girder at the same position as the lower supporter, after the supporting step is installed. The method for manufacturing a preflex beam according to claim 4. 8. A step of providing a first pair of upper and lower plate girders with sleds arranged on the upper and lower sides, and a second set of upper and lower plate girders with sleds arranged on the upper and lower sides of each other. The first and second sets of upper plate girders and the first set
Connecting the lower plate girders of the first set and the second set to each other using a plurality of upper diaphragms and lower diaphragms arranged at regular intervals, and a plurality of lower sides laterally to each of the lower diaphragms. The step of providing a support base, the step of providing a support member at a fixed fulcrum above each of the lower plate girders, and the upper part of the upper plate girders of each set corresponding to the loading position of the pre-reflection load or the lower side of each set Providing a hydraulic jack at the bottom of the plate girder, firmly surrounding the upper plate girder and the lower plate girder of each set, and the hydraulic jack using a square frame, and using the hydraulic jack Applying a pre-reflection load to the pair of plate girders, and the lower flange and lower plate girder of each of the adjacent upper plate girders. Production method of pre flexbeam characterized by comprising, including the steps of coating the concrete Da upper flange. 9. In order to use as a simple beam, the fixed fulcrum is located at both ends of the plate girder, and the loading position of the pre-reflection load is about L / 5 from both ends of the plate girder. 9. The method for manufacturing a preflex beam according to claim 8, wherein: 10. In order to use as an inner beam of a continuous beam, the position of the fixed fulcrum is set to about L / 5 from both ends of the plate girder, and the loading position of the pre-reflection load is set to both ends of the plate girder. To about L / 3, the manufacturing method of the preflex beam according to claim 8, wherein. 11. For use as an outer beam of a continuous beam, the position of the fixed fulcrum is set to about L / 5 from both ends of the plate girder, and the loading position of the pre-reflection load is set to both ends of the plate girder. To about L / 4 and L / 2. 9. The method for manufacturing a preflex beam according to claim 8, wherein 12. When the length of the plate girder is 20 m or less, the lower supports are respectively provided at the loading positions of the pre-reflection load, and the upper plate girder is installed after the installation of the lower supports. The pre-flex according to any one of claims 9 to 11, further comprising the step of providing a plurality of upper support bases for supporting the upper support plate on the upper plate girder at the same position as that of the lower support support. Beam manufacturing method. 13. The plate girder has a length of 20 m to
In the case of the range of 30 m, the lower support bases are provided at three places, 0.1L and 0.5L from both ends of the lower plate girder, respectively. The pre-flex according to any one of claims 9 to 11, further comprising the step of providing a plurality of upper support bases for supporting the upper support plate on the upper plate girder at the same position as that of the lower support support. Beam manufacturing method. 14. When the length of the plate girder is 30 m or more, the lower support bases are provided at four positions of 0.1 L and 0.3 L from both ends of the lower plate girder, respectively. 10. The method according to claim 9, further comprising a step of providing a plurality of upper supporters for supporting the upper plate girder on the upper plate girder at the same position as the lower supporter, after the supporting step is installed. The method for manufacturing a preflex beam according to claim 11. 15. The upper and lower plate girders of the second set, which are arranged side by side with the upper and lower plate girders of the first set, are configured by at least one or more. Manufacturing method of pre-flex beam described in. 16. A pair of first and second straight rolled steel bars without a warp, which are arranged on the upper and lower sides of each other, are provided, and the first and upper rolled steel bars are connected at a fixed fulcrum using PS steel bars. And a second set of straight rolled steel bars without a warp, which are arranged on the upper and lower sides of each other, are provided, and the second set of upper and lower rolled steel bars are connected using PS steel bars at a fixed fulcrum. A step of arranging the first set of upper and lower rolled shape steels and a second set of upper and lower rolled shape steels side by side at regular intervals, and the first and second set of upper rolled shape steels Connecting the lower rolled shaped steels of the first set and the second set to each other using a plurality of upper diaphragms and lower diaphragms arranged at regular intervals, and connecting each of the lower diaphragms to the lower side. The stage of installing the support and the upper side of each set corresponding to the loading position of the pre-reflection load The hydraulic jack is provided between the rolled shape steel and the lower rolling shape steel,
Applying a pre-load to the upper and lower rolled steel bars by using the hydraulic jack to cause plastic deformation and warp, and a step of providing a supporting member at a fixed fulcrum above each of the lower rolled steel bars. And a step of removing the PS steel bar provided at the fixed fulcrum and the hydraulic jack provided at the loading position of the pre-reflection load, and an upper part of each set of the upper rolled shaped steels corresponding to the loading position of the pre-reflection load Or, a step of providing a hydraulic jack on the lower part of the lower rolled section steel of each set, and a step of firmly surrounding the upper rolled section steel and the lower rolled section steel of each set and the hydraulic jack using a square frame, Applying a pre-reflection load to each set of rolled steel bars using the hydraulic jack, and connecting the lower flange of each upper rolled steel bar and the upper flange of each lower rolled steel bar adjacent to each other. Pre flexbeam fabrication method using the linear rolling shaped steel without the sled, characterized in that it is made, including the steps of coating the over bets. 17. For use as a simple beam, the fixed fulcrums are located at both ends of the rolled section steel, and the loading position of the pre-reflection load is about L / 5 from both ends of the plate girder. The method of manufacturing a pre-flex beam using a straight rolled shape steel without a warp according to claim 16, characterized in that. 18. For use as an inner beam of a continuous beam, the positions of the fixed fulcrums are set to about L / 5 from both ends of the rolled shape steel, and the loading position of the pre-reflection load is set to the rolled shape steel. 17. The method for producing a pre-flex beam using a straight rolled shape steel without a warp according to claim 16, wherein the length is set to about L / 3 from both ends. 19. In order to use as an outer beam of a continuous beam, the positions of the fixed fulcrums are set to about L / 5 from one end and the other end of the rolled steel, respectively, and the loading position of the pre-reflection load is set. From each end of the rolled steel to approximately L /
4. It becomes 4 and L / 2, It is characterized by the above-mentioned.
7. A method for manufacturing a preflex beam using the straight rolled steel having no warp according to 6. 20. When the length of the rolled steel is 20 m or less, each of the lower supports is provided at the loading position of the pre-reflection load, and after the installation of the lower support, the upper rolling is performed. 20. The method according to claim 17, further comprising the step of providing a plurality of upper supporting bases for supporting the shaped steel in the upper rolled shaped steel at the same position as the installation position of the lower supporting base. Manufacturing method of pre-flex beam using straight rolled steel without warping. 21. The rolled shaped steel has a length of 20 m to 30 m.
In the case of the above range, the lower support bases are respectively provided at three places of 0.1L and 0.5L from both ends of the lower rolled shape steel. 20. The method according to claim 17, further comprising the step of providing a plurality of upper supporting bases for supporting the steel on the upper rolled shaped steel at the same position as the installation position of the lower supporting base. Manufacturing method of pre-flex beam using straight rolled steel without warping. 22. When the length of the rolled steel strip is 30 m or more, the lower support bases are provided at four positions of 0.1 L and 0.3 L from both ends of the lower rolled steel strip, respectively. After the step of installing the lower support base, the method further comprises the step of providing a plurality of upper support bases supporting the upper rolled shape steel on the upper rolled shape steel at the same positions as the installation positions of the lower support base. A method of manufacturing a pre-flex beam using the straight rolled steel having no warpage according to any one of claims 17 to 19. 23. A step of connecting dummy rolled steel bars using bolts to both ends of a straight rolled steel sheet without warping, and arranging a pair of the first rolled steel sheets above and below,
A step of connecting both ends to be the fulcrum by using PS steel bar, and a second pair of the above-mentioned rolled shaped steels arranged in another pair are arranged on the upper and lower sides, and both ends to be the fulcrum are connected using PS steel bar. And a step of arranging the first set of upper and lower rolled shape steels and the second set of upper and lower rolled shape steels side by side at regular intervals, and the first and second sets of upper rolled shape steels. And connecting the lower rolled shaped steels of the first set and the second set to each other by using a plurality of upper diaphragms and lower diaphragms arranged at regular intervals, and connecting the lower rolled steel bars to the lower diaphragms. A hydraulic jack is provided between the bolt connection part of the upper rolling section steel and the bolt connection section of the lower rolling section steel of each set at the stage where the side support base is installed and at the loading position of the pre-reflection load. Use a jack to pre-flex the upper and lower rolled steel The step of applying a load, the upper flange of the remaining rolled shape steel excluding the dummy rolled shape steel from each of the upper rolled shape steel and the lower flange of the remaining rolled shape steel excluding the dummy rolled shape steel from each of the lower rolled shape steel With concrete, a step of providing a supporting member at a fixed fulcrum above each of the lower rolled steel bars, a step of removing the PS steel bar and the hydraulic jack, an upper portion of each upper rolled steel bar of each set or Providing a hydraulic jack in the lower bolt connection part of the lower rolled section steel of each set, and firmly surrounding the upper rolled section steel and lower rolled section steel of each set and the hydraulic jack using a square frame. A step of applying a pre-reflection load to each of the rolled shaped steels of the set using the hydraulic jack, and a lower flange of the remaining rolled shaped steel excluding the dummy rolled shaped steel from each of the upper rolled shaped steels. Note: The step of coating the upper flange of the remaining rolled shape steel excluding the dummy rolled shape steel from each lower rolled shape steel with concrete, and the dummy rolled shape steel connected to both ends of each rolled shape steel covered with concrete. A method of manufacturing a preflex beam for a pile and a pillar, which comprises a step of dismantling. 24. When compressive stress should be introduced into abdominal concrete, the method further includes the step of coating the abdomen of the rolled shaped steel with concrete and inserting a PC steel wire, and then introducing compressive stress by a pretensioning method. 24. The method for manufacturing a preflex beam for piles and columns according to claim 23, wherein: 25. When the pre-flex beam to be manufactured has a predetermined length or more, a step of expanding the cross section of the connecting portion of each rolled shape steel to increase the rigidity, and a grou for inserting the mating rolled shape steel. The pile and the pillar according to claim 23, further comprising: forming a grooving groove to bond the rolled shaped steels to each other; and injecting a grouting agent through the grouting groove. For manufacturing pre-flex beam for car. 26. When the length of the rolled steel is 20 m or less, the lower supports are respectively provided at the loading positions of the pre-reflection load, and after the installation of the lower supports, the upper rolling is performed. The free flex for pile and column according to claim 23, further comprising the step of providing a plurality of upper supporting bases for supporting the shaped steel in the upper rolled shaped steel at the same position as the installation position of the lower supporting base. How to make a mold. 27. The rolled shaped steel has a length of 20 m to 30 m.
In the case of the above range, the lower support bases are respectively provided at three places of 0.1L and 0.5L from both ends of the lower rolled shape steel. 24. The pile and pillar free flex type of claim 23, further comprising the step of providing a plurality of upper supporting bases for supporting the steel on the upper rolled shaped steel at the same position as that of the lower supporting base. How to make. 28. When the length of the rolled section steel is 30 m or more, the lower support bases are provided at four positions of 0.1 L and 0.3 L from both ends of the lower rolled section steel, respectively. After the step of installing the lower support base, the method further comprises the step of providing a plurality of upper support bases supporting the upper rolled shape steel on the upper rolled shape steel at the same positions as the installation positions of the lower support base. A method for manufacturing a pile and a post-free flex type according to claim 23. 29. The upper and lower rolled shape steels of the second set arranged side by side with the upper and lower rolled shape steels of the first set are configured by at least one or more. For manufacturing pre-flex beams for piles and columns.