JP2009263868A - Manufacturing equipment and manufacturing method for prestressed composite girder employing erection girder as reaction body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide manufacturing equipment and a manufacturing method for a prestressed composite girder employing an erection girder as a reaction body. <P>SOLUTION: The erection girders 8 as the reaction bodies are juxtaposed at spacings so that steel girders can be arranged among them; cross beams 12 are installed on the upper portions of the erection girders in positions at both the ends of the steel girder, respectively; pulling jacks 3 are provided on the cross beams 12, respectively; the side of one end of a prestressing steel bar 14 with a screw, which is connected to the steel girder 2, is engaged with the pulling jack 3; and cross beams 9 for holding the steel girder are fixed to one or more locations at spacings in the intermediate portion of the erection girder, respectively. The steel girders 2 are arranged among the erection girders 8, juxtaposed at the spacings, by using the above equipment 1, respectively; the side of the other end of the prestressing steel bar 14, the one end side of which is engaged with the pulling jack 3 provided for each cross beam 12, is connected to the steel girder 2; and the end of the steel girder is pulled up by operating the respective pulling jacks 3 at both the ends of the erection girder 8 in the state of holding the intermediate portion of the steel girder 2 by the beam 9 provided over the erection girder 8. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a prestressed composite girder manufacturing apparatus and manufacturing method for manufacturing a prestressed composite girder, and more particularly to a prestressed composite girder manufacturing apparatus and manufacturing method using a built-up girder as a reaction body.

  Conventionally, as a prestressed composite girder manufacturing apparatus, for example, as shown in FIG. 9, two steel girders 2 are arranged at intervals in the vertical direction, and at the same time a load is applied to bend and elastically deform the steel girder 2. The steel girder for which a concrete is placed on the lower flange 4 side when the steel girder 2 is used, the concrete is hardened, the load is removed, prestress is introduced into the concrete, and a prestressed composite girder is manufactured. Two cases of construction are known.

  Further, as shown in FIG. 10 (a), one steel girder 2 is arranged on the cross beam 6, and the end of the steel girder 2 and the anchor base 42 are connected to a jack such as a threaded PC steel 14 and a center hole jack. 3A, and by extending the jack 3A, a load is applied to the steel girder 2, the steel girder 2 is bent and elastically deformed, concrete is placed on the lower flange 4 side, and after the concrete is hardened, It is also known to produce prestressed composite girders by removing the load and introducing prestress into the concrete.

Moreover, as a manufacturing apparatus of a prestress synthetic girder, there also exists a technique shown by the following patent documents 1-3.
Japanese Patent Publication No.33-10424 JP 59-24014 A Japanese Patent Publication No. 61-19307

As shown in FIG. 9, when two pre-stressed composite girders 17 as shown in FIG. 10B are manufactured by arranging two steel girders simultaneously, it is necessary to invert the steel girders 2 located on the upper side. When the steel girder 2 is short, the bending rigidity in the weak axis direction of the steel girder 2 can be expected to be relatively large. However, since the steel girder is designed in the vertical direction, if the steel girder length increases, the weak axis direction becomes vertical when the steel girder is laid sideways. There is a case.
Further, in the case where one steel girder shown in FIG. 10A is arranged on the cross beam 6, the anchor foundation 42 must be constructed in order to take jack reaction force. Therefore, time and labor are required for the construction of the anchor foundation 42, and the manufacturing cost per prestress composite girder increases.
The present invention can solve the above-mentioned problems, and can produce a prestressed composite girder without inversion even when the girder length of the steel girder is long, and it is not necessary to construct an anchor foundation. An object of the present invention is to provide a manufacturing apparatus and a manufacturing method of a prestressed composite girder using a girder as a reaction body.

In order to advantageously solve the above-described problem, in the prestressed composite girder manufacturing apparatus using the erected girder of the first invention as a reaction force body, the reaction girder is arranged at intervals so that the steel girder can be arranged therebetween. An installation beam is arranged in parallel, a horizontal beam is installed on the upper side of the installation beam at both ends of the steel beam, a tensile jack is provided on the horizontal beam, and a PC steel bar connected to the steel beam is connected to the extension jack. One end side is engaged, and the steel girder transverse beam is fixed at one place or a plurality of spaced intervals in the middle part of the erection girder.
Further, in the second invention, in the prestressed composite girder manufacturing apparatus using the erection girder of the first invention as a reaction body, a lower part of the erection girder can be secured so that a working space can be secured in the steel girder under flange. Is characterized in that a gap is provided.
In the third invention, the prestressed composite girder manufacturing apparatus using the erected girder of the first invention or the second invention as a reaction body is provided with a steel girder falling prevention device.
Moreover, in the 4th invention, in the manufacturing apparatus of the pre-stress synthetic girder which used the installation girder of any one of the 1st invention-the 3rd invention as a reaction body, the rail extended below the steel girder in the longitudinal direction of the installation girder And a carriage that moves along the rail.
Further, in the prestressed composite girder manufacturing method of the fifth aspect of the invention, the prestressed composite girder manufacturing apparatus using the erected girder of any of the first to fourth aspects of the invention as a reaction body and spaced in parallel. Steel girders are placed between the erected girders, and the other end of the PC steel bar, one end of which is engaged with the tension jack provided on the cross beam, is connected to the steel girders, and the middle part of the steel girders is erected. The steel girder ends are pulled up by operating the tension jacks at both ends of the installation girder in a state of being held by the steel girder holding beams provided over the girders.

According to the prestressed composite girder manufacturing apparatus using the erected girder of the first invention as a reaction force body, the erection girder as the reaction force body is arranged in parallel with a space so that the steel girder can be arranged therebetween, and the steel A transverse beam is installed on the upper part of the erection beam at both ends of the spar, a tension jack is provided on the transverse beam, and one end side of a PC steel rod connected to the steel girder is engaged with the tension jack, and the middle of the erection beam Steel girder holding cross beams are fixed at one place or at several intervals, so that the steel girder can be used normally without reversing the steel girder as in the past and without providing an anchor foundation. By using a girder installed girder as a reaction body, even long steel girders can be easily pre-reflected, and long prestressed composite girders can be easily manufactured. It is done. Moreover, effects such as a simple structure of the apparatus can be obtained.
In addition, according to the second invention, since a gap is provided below the installation girder so as to secure a working space in which concrete can be placed on the steel girder lower flange, when concrete is placed on the steel girder lower flange. Workability space can be secured, and arrangement of reinforcement and formwork for placing concrete on the lower flange of steel girders, or concrete placement and formwork removal work can be performed efficiently. The effect that can be obtained.
The effect is obtained.
In addition, according to the third aspect of the invention, since the steel girder is provided with a device for preventing the rollover of the steel girder, it is possible to reliably prevent the steel girder from falling over or buckling when the steel girder is elastically deformed by the pulling jack. The effect that can be obtained.
According to the fourth invention, the steel girder or the prestressed composite girder is mounted on the carriage under the steel girder, because it has a rail extending in the longitudinal direction of the installation girder and a carriage moving along the rail. It is possible to pull the girders between the erected girders and pull the completed prestressed girder easily from the erected girder in a short time for transportation, and to speed up the cycle time when manufacturing the prestressed girder. And an inexpensive prestressed composite girder can be manufactured.
According to the fifth invention, the prestressed composite girder manufacturing apparatus using the erected girder according to any one of the first to fourth inventions as a reaction body, and steel between the erected girder arranged in parallel at intervals. A steel girder presser with a girder arranged, the other end of the PC steel bar engaged with the tension jack provided on the cross beam on one end is connected to the steel girder, and the middle part of the steel girder is provided across the installation girder. The steel girder is lifted by operating the tension jacks at both ends of the installation girder while being held down by the beam, so that the steel girder can be easily used by using the installation girder as a reaction body that elastically deforms the steel girder. It can be reliably elastically deformed.
The effect is obtained.

  Next, the present invention will be described in detail based on the illustrated embodiment.

  FIG. 1 shows a state in which a steel girder 2 is set in the prestressed composite girder manufacturing apparatus 1 using the erected girder of the first embodiment of the present invention as a reaction force. FIG. 2 shows the steel girder 2 being set. Thereafter, the pulling jack 3 is extended to show the state in which the end of the steel girder is pulled up. FIG. 3 shows the state in which the concrete 5 is placed on the lower flange 4 of the steel girder 2, and (a) is a longitudinal section. Side view, (b) is a front view or a longitudinal front view.

  First, with reference to FIG. 1, a first embodiment of a prestressed composite girder manufacturing apparatus 1 using the installation girder of the present invention as a reaction force will be described.

  A pair of horizontal beams 6 for the reaction beam receiving or the steel beam lower horizontal beam as a temporary mounting table are arranged on the base 7 so as to be spaced apart in the left-right direction and to extend in the front-rear direction. The horizontal beam 6 is spaced apart in the longitudinal direction, and two construction girders 8 made of steel girder are extended so as to extend in the left-right direction so as to be orthogonal to the transverse beam 6 and can be attached and detached by bolts or the like not shown. is set up.

  The interval between the two erection girders 8 is wider than the width dimension of the steel girder 2 arranged between them, and the length dimension of the two erection girders 8 is as follows. It is set longer than the length dimension of 2.

  Steel as two horizontal beams for holding the steel girders spaced in the left-right direction across the center on the two erected beams 8 so as to face the lower horizontal beams 6 for the steel girders with a space. A girder holding upper cross beam 9 is placed and detachably installed with bolts (not shown). The pair of steel girder holding upper cross beams 9 and the pair of steel girder lower cross beams 6 are interposed between them. It is detachably connected by a fixing steel fitting 10 such as a threaded PC steel rod 10 and a support plate or nut arranged vertically.

  A support block 11 made of a shape steel for supporting the central portion of the steel girder 2 is detachably fixed to the lower surface of the pair of steel girder upper horizontal beams 9 by means of bolts and nuts not shown. ing. Accordingly, the reaction force acting on the center portion of the steel girder 2 supported so as to be pressed by the support block 11 is transmitted through the upper girder 9 for holding the steel girder, the PC steel bar 10 with the screw, and the lower horizontal beam 6 for the steel girder. Thus, it is supported by the erection beam 8 and uses the erection beam 8 as a reaction force body.

  On both ends of the two erection girders 8, transverse beams 12 are detachably installed with bolts, nuts, etc. at intervals over them. On each of the transverse beams 12, a hydraulic jack or the like is provided. A telescopic tension jack 3 is installed so as to be erected, and a support member 13 having a plurality of PC steel rod insertion through holes at intervals in the middle part in the front-rear direction over the upper part of each tension jack 3. Is disposed on the support member 13 at the upper end portion of the threaded PC steel rod 14 such as a PC steel rod having a different total diameter threaded through the PC steel rod insertion through hole of the support member 13. The nut 15 is engaged.

  Further, each of the threaded PC steel bars 14 on the end side of the installation girder 8 is arranged so as to hang down, and is arranged so that the level can be adjusted, and the lower end thereof is below the upper flange 16 in the steel girder 2. Can be placed in a level.

  Next, the prestress composite girder 17 in which the prestress is introduced is manufactured by providing concrete on the lower flange side of the steel girder 2 by the prestressed composite girder manufacturing apparatus 1 using the erected girder as a reaction force. The case where it does is demonstrated.

  While steel materials other than the construction beam 8 and the lower cross beam 6 for the steel girder are removed, the steel girder 2 is arranged on the lower cross beam 6 for the steel beam between the installation beams 8 and the upper cross beam 9 for holding the steel girder is installed. It connects with the lower cross beam 6 for steel girders, or installs the cross beam 12 and the pulling jack 3 etc. of both ends. A plurality of PC steel rod insertion holes are provided in the upper flanges at both ends of the steel beam 2.

  Further, the lower end portion of the threaded PC steel rod 14 that hangs between the cross beams 12 is inserted into the upper flange 16 of the steel beam 2, and a support plate is attached to the lower end portion of each threaded PC steel rod 14, and a nut 19 or the like is attached. It is screwed and engaged with the lower surface of the upper flange 16 of the steel beam 2.

From the above state, as shown in FIG. 2, the pulling jack 3 is extended and the ends of the steel girder 2 and the steel girder 2 are pulled up to elastically deform both sides of the steel girder 2 in the left-right direction.
In this case, if the lower surface of the central portion of the steel girder 2 is floated from the lower cross beam 6 for the steel girder and engaged with the steel girder support block 11, the concrete 5 can be placed over the entire length of the steel girder 2. it can.
A mold (not shown) is disposed on the lower flange 4 of the steel beam 2 at an appropriate time. In this state, a reinforcing bar is appropriately arranged around the lower flange 4 of the steel girder 2 and concrete 5 is placed. After the concrete 5 is hardened, the pulling jack 3 is shortened so that the steel girder 2 is lifted to release the elastic girder so as to cancel the elastic deformation, and prestress is introduced to the hardened concrete. A composite girder 17 is manufactured.

  Then, steel materials other than the installation girder 8 and the lower cross beam 6 for the steel girder are removed as appropriate, and the prestressed composite girder 17 is conveyed and removed to the installation location or the like.

  Next, the prestressed composite girder manufacturing apparatus 1 using the installation girder according to the second embodiment of the present invention as a reaction body will be described with reference to FIGS. Note that parts different from those of the first embodiment will be mainly described, and similar parts will be simply described with the same reference numerals.

  This second embodiment is a case where the span of the steel beam 2 is long. For example, it is a form suitable for producing a prestressed composite beam having a long span exceeding 30 m, 50 m, or 50 m. This is also possible when manufacturing short prestressed composite girders.

  As shown in FIG. 4 and FIG. 6, both ends of a construction girder 8 made of two steel girders extending in the left-right direction at intervals in the front-rear direction are arranged on a base 7 such as concrete. On the base plate, the H-shaped steel is placed on a frame 21 in a multi-stage shape like a cross-girder, and the lower part of each installation beam 8 is fixed by bolts and nuts (not shown) as appropriate. Therefore, the intermediate part of the erection girder 8 is in a state of floating so as to secure a work space from the concrete base 7.

  Below the erection girder 8 is supported by a steel support member such as an H-shaped steel, and on the sleepers 22 placed over these, a space is provided in the front-rear direction and the left-right direction is extended. A carriage traveling rail 23 is laid, and a plurality of self-propelled carriages 24 are disposed on the carriage traveling rail 23 so as to be able to travel. The level of the upper surface of the self-propelled carriage 24 is set at a lower level than the lower surface level of the installation girder, and a work space 25 is provided between the carriage running rail 23 and the lower surface of the lower flange 4 of the steel girder 2. To form. Further, by providing the work space 25 as described above, a work space in which the concrete 5 can be placed on the steel girder lower flange 4 can be secured, and a gap is provided below the erection beam 8. That is, a gap is provided between the lower surface of the intermediate portion of the erection beam 8 and the base 7.

  Since the intermediate part of the erection beam 8 is in a floating state as described above, the erection beam 8 receives all reaction force when the steel girder 2 supported by the transverse beam attached thereto is elastically deformed. It has become. However, since the reaction force is received by the two construction girders 8 having higher rigidity than the steel girder 2, the two construction girders 8 can be suppressed to a negligible minute deformation.

  The cross beam 12 arranged at the end of the erection beam 8 is installed via a longitudinal height adjusting steel 26 and a horizontal height adjusting steel 26 arranged on the erection beam 8. . Each of the above-mentioned height adjusting shape steel, the erection beam 8 and the cross beam 12 are appropriately detachably coupled by bolts, nuts and the like. Further, in this embodiment, each pulling jack 3 is a center hole jack, and the threaded PC steel material 14 is disposed in the center hole jack 3 so that the support plate or nut 15 is engaged with the piston.

Further, each installation girder 8 is provided with a large number of vertical guide support members 27 having a flat support surface in the vertical direction at intervals in the longitudinal direction of each installation girder 8. . Correspondingly, a length-adjustable upper arm that has rollers 28 that can be rotated by a horizontal axis at the front end on both front and rear sides of the web of the steel girder 2 with a space in the vertical direction. 29 and a lower arm 30 are provided.
Each of the arms 29 and 30 is composed of a proximal arm that is attached to the web of the steel girder 2 by bolts and nuts (not shown) and a distal arm that includes a roller 28. The proximal arm The tip arm can be adjusted by bolts and nuts. The base end side arm and the front end side arm have a main body portion made of a section steel such as H-shaped steel, and the base end side arm has an upper flange on the front end side arm and a lower flange on the member axial direction (toward the installation girder). A plurality of bolt insertion holes are provided continuously or at intervals in the direction) so that the amount of protrusion of the distal arm can be adjusted.

  When the steel girder 2 is raised from above the carriage 24 by the vertical guide support member 27 and the upper arm 29 and the lower arm 30, or the prestressed composite girder 17 manufactured by changing from the steel girder 2 is lowered. When placed on the carriage 24, the steel girder 2 and the prestress composite girder 17 can be moved up or down in a predetermined posture.

  Moreover, as shown in FIG. 4 and FIG. 7, two steel girder presses spaced in the left-right direction across the upper part of each installation girder 8 at an equal distance from the center of each installation girder 8. A plurality of sets of upper cross beams 9 are provided (two sets in the illustrated form), and correspondingly, a plurality of sets of two lower cross beams 6 for steel girders spaced in the left-right direction (in the illustrated form are illustrated). 2 sets). The upper steel beam 9 for holding the steel girder and the lower horizontal beam 6 for steel girder are each provided with a support steel material 31 that is arranged in parallel with a space in the front-rear direction and extends in the left-right direction. The steel beam girder upper cross beam 9 or the steel girder lower cross beam 6 is detachably attached by bolts and nuts, respectively. A threaded PC steel rod 10 made of a PC steel rod having a different total diameter is disposed across the support steel 31 on the upper cross beam 9 for holding the steel girder and the support steel 31 below the lower cross beam 6 for steel girder. A support plate and a nut 32 are attached to the threaded PC steel rod 10, and the support plate is engaged with the support steel material 31.

  Below the upper horizontal beam 9 for holding the steel girder, it is arranged at intervals in the front-rear direction so as to be located inside the opposing erection beam 8, and the upper part of each vertical frame member 33 is used for holding the steel girder. Reinforcing ribs 34 are provided at the corners of the vertical frame members 33 and the upper horizontal beams 9 for holding the steel girder, and are fixed to the upper transverse beams 9. The base end side of the length-adjustable support arm 35 having a mounting portion having a rotating tool engaging portion in the middle portion is rotatably mounted. The front end portion of the support arm 35 is detachably attached to a vertical rib 36 such as a stiffener provided at an intermediate portion of the steel beam 2. In addition, at the lower part of the vertical frame member 33, a base end portion of a steel girder lower support member 37 projecting toward the web of the steel beam 2 is directly attached to the vertical frame member 33 or via an angle member fixed thereto. The steel girder lower support member 37 is disposed so that the tip of the steel girder lower support member 37 is in contact with or close to the web of the steel girder 2.

  The support girder 35 and the vertical frame member 33 and the steel girder lower support member 37 attached to the steel girder upper transverse beam 9 constitute a steel girder lateral fall prevention device 38. By means of the above-described lateral fall prevention device 38, the lateral fall buckling of the steel girder 2 in the load-loading ground for the steel girder 2 is prevented.

  The lower cross beam 6 for the steel girder is adapted to engage with the installation girder 8 through a short level adjusting shape steel 39 and an adjusting plate arranged below the installation girder 8. On the lower side of the intermediate part of the upper horizontal beam 9 for holding, a support block 11 made of a short-shaped steel such as an H-shaped steel for supporting the intermediate part of the steel girder 2 is detachable by bolts and nuts not shown. It is fixed.

  Further, as shown in FIGS. 8 and 4, a plurality of installation girder spacing holding members 40 are provided in the middle portion in the longitudinal direction of the two installation girders 8 so as to be spaced apart in the longitudinal direction of the installation girder. A stopper member 41 that protrudes downward is detachably attached to the lower side of the end portion of each erection girder spacing holding member 40 by means of bolts, nuts, etc. (not shown) to the outside of the erection girder 8 in the lateral direction. The deformation is prevented.

  Next, a case where the prestressed composite girder 17 is manufactured using the prestressed composite girder manufacturing apparatus 1 using the erected girder of the second embodiment as a reaction body will be described.

In the state where the long steel girder 2 is temporarily fixed to the dolly with bolts, nuts, etc. as appropriate over the self-propelled dolly 24 arranged at intervals in the left-right direction of the running rail 23, It is conveyed and placed at a predetermined position.
In order to enable the steel girder 2 to be transported in this way, the interfering members such as the threaded PC steel bar 14 projecting from the erection girder 8 to the steel girder 2 side, the support arm 35, and the steel girder lower support member 37 are made of steel. The girder 2 is retracted to a position where it does not interfere or removed, and the steel girder 2 is placed at a predetermined position and then placed at a predetermined position. In addition, the steel girder 2 can be arranged at a predetermined position with the upper arm 29 on the steel girder 2 side or the distal arm of the lower arm 30 retracted, and each arm can be shortened so that it can be arranged between the erection girder 8. After the steel girder 2 is transported and arranged in the state, the arms are extended and arranged at predetermined positions.

Next, the tip of the threaded PC steel rod 14 is inserted into the upper flange 16 of the steel girder 2, and a support plate and a nut 19 are attached to the threaded PC steel rod 14 on the lower surface side of the upper flange 16, and the upper Engage with the flange 16.
Then, the pulling jack 3 is extended to raise the steel girder 2 through the threaded PC steel rod 14, and the upper surface of the intermediate part of the steel girder 2 is engaged with the lower surface of the steel girder support block 11.
In this state, the steel jack 2 is elastically deformed into an arc shape by gradually extending the pulling jack 3 to pull up the end side of the steel beam 2.
In this case, the support tool 35 is gradually shortened by rotating the turning tool engaging portion in the support arm 35.

In the state where the steel girder 2 is elastically deformed in an arc shape as described above, illustration is omitted on the lower flange 4 of the steel girder 2. As shown, concrete 5 is cast. After the concrete 5 is hardened, the formwork is removed to form a prestressed composite girder 17.
Thereafter, the pulling jack 3 is gradually shortened, and the end portion of the prestress composite girder 17 is placed on the transport carriage 24. In this case, the rotating tool engaging portion of the support arm 35 is rotated to gradually extend the support arm 35 or remove it. Moreover, the lower cross beam 6 for steel girders is removed suitably.

  After placing the prestress composite girder 17 on the transport carriage 24 as described above, when the prestress composite girder 17 is moved in the transport direction, the steel girder lower side support on the installation girder 8 side that interferes with the steel girder 2 is supported. The member 37 is removed, and the upper arm 29 or the lower arm 30 that interferes with the installation beam 8 side is removed.

  As described above, after the prestress composite girder 17 and the erection girder 8 side do not interfere with each other, the prestress composite girder 17 is pulled out together with the carriage 24 and appropriately transported to the installation location.

  In each of the above-described embodiments, a normal steel girder can be used as the erection beam 8 and the main member of the prestressed composite girder manufacturing apparatus 1 using the erection beam as a reaction body constitutes a low cost. It can be set as the manufacturing apparatus 1 of the pre-stress synthetic | combination girder which used the erected girder as a reaction body.

  In the second embodiment, the steel beam 2 and the prestress composite girder 17 can be carried out or transported by the transport carriage 24, so that the long prestress composite girder 17 can be efficiently manufactured at a low cost. can do.

  When implementing this invention, as the steel beam 2, it is good also as an assembly-type steel beam. Further, the upper horizontal beam 9 for holding the steel girder may be directly fixed to the installation girder 8 with a threaded PC steel rod.

The state which set the steel girder in the manufacturing apparatus of the prestress synthetic girder which made the construction girder of the 1st Embodiment of this invention the reaction force body, Comprising: (a) is a vertical side view, (b) is It is a front view. 1 shows a state in which a steel girder is set in a prestressed composite girder manufacturing apparatus using the erected girder of the first embodiment of the present invention as a reaction body, and then a pulling jack is shortened to raise a steel girder end. (A) is a longitudinal side view and (b) is a front view. FIG. 3 shows a state in which concrete is placed on the lower flange of a steel girder from the state shown in FIG. 2 to form a prestressed composite girder, where (a) is a longitudinal side view and (b) is a longitudinal front view. It is a schematic longitudinal cross-sectional side view which shows the state which set the steel girder to the manufacturing apparatus of the prestress synthetic girder which used the construction girder of 2nd Embodiment of this invention as the reaction body. It is a vertical side view which expands and shows the edge part vicinity of FIG. It is the AA line expanded sectional view of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. An example of the manufacturing apparatus of the conventional prestress synthetic girder is shown, Comprising: (a) is a side view which shows the state which set the steel girder, (b) is a side which shows the state which elastically deformed the end part of a steel girder FIG. (A) shows the other example of the manufacturing apparatus of the conventional prestress synthetic girder, Comprising: The side view which shows the state which set the steel girder and elastically deformed the steel girder, (b) is prestress synthetic | combination It is a side view which shows the example of a digit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus of pre-stress composite girder which used construction girder as reaction force 2 Steel girder 3 Pull jack 4 Lower flange of steel girder 5 Concrete 6 Lower cross beam for steel girder 7 Base 8 Erecting girder 9 Upper cross girder for holding steel girder (Steel Cross beam for girder)
DESCRIPTION OF SYMBOLS 10 Threaded PC steel bar 11 Support block 12 Cross beam 13 Bearing member 14 Threaded PC steel bar 15 Nut 16 Steel girder upper flange 17 Prestress composite girder 19 Nut 21 Mounting base 22 Sleeper 23 Rail 24 Bogie 25 Work space 26 Height Shaped steel for adjustment 27 Vertical guide support member 28 Roller 29 Upper arm 30 Lower arm 31 Support steel material 32 Nut 33 Vertical frame material 34 Reinforcement rib 35 Support arm 36 Vertical rib 37 Steel girder lower support member 38 Steel girder fall prevention device 39 Steel for level adjustment 40 Construction girder spacing holding member 41 Stopper member

Claims (5)

  The installation girders as reaction force bodies are arranged in parallel so that the steel girders can be arranged in between, and a horizontal beam is installed on the upper part of the construction girders at the positions of both ends of the steel girder, and a tension jack is attached to the horizontal beam. One end side of a PC steel bar connected to the steel girder is engaged with the tension jack, and a steel girder holding cross beam is fixed to one place or a plurality of intervals at the intermediate part of the installation girder. A prestressed composite girder manufacturing apparatus using a built-up girder as a reaction body.   The pre-stress synthesis using the installation girder according to claim 1 as a reaction body, wherein a gap is provided below the installation girder so as to secure a working space in which concrete can be placed on the steel girder flange. Girder manufacturing equipment.   3. A prestressed composite girder manufacturing apparatus using the erected girder according to claim 1 or 2 as a reaction body, comprising a steel girder falling prevention device.   4. The installation girder according to any one of claims 1 to 3, further comprising a rail extending in a longitudinal direction of the installation girder and a carriage that moves along the rail below the steel girder. A prestressed composite girder manufacturing device.   A prestressed composite girder manufacturing apparatus using the erected girder according to any one of claims 1 to 4 as a reaction body, a steel girder disposed between erected girder arranged in parallel at intervals, and a horizontal beam In the state where the other end of the PC steel bar which one end side is engaged with the tension jack provided in is connected to the steel girder, and the middle part of the steel girder is pressed by the beam for holding the steel girder across the installation girder. A method for producing a prestressed composite girder, wherein the tension jacks at both ends of the installation girder are operated to pull up the steel girder ends.

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