KR20180129256A - Incremental launching apparatus having spreader beam assembly for controlling bearing stress of hydraulic jack, and method for the same - Google Patents

Abstract

Provided is an extruding device having hydraulic pressure propulsion jack adjustable spreader beam assembly and a method thereof, in which by installing the pneumatic stress adjustment type spreader beam assembly at the time of constructing the upper slab of the composite bridge, the pressure stress generated by the propulsion force of the hydraulic pressure propulsion jack propelling the extruded slab structure is evenly distributed or differently distributed, thereby preventing damage of the slab. Also, by adjusting the stress balance in the structure within the range of the spreader beam during pushing of the structure such as the extrusion slab, stress is adjusted such that stress on the structurally unfavorable part can be reduced, and the stress is able to be adjusted such that stress in the part where a more stable position or an effective sectional area is advantageously secured.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extruding apparatus for a hydraulic propulsion jack having a sprung beam adjusting assembly,

More particularly, the present invention relates to an extrusion method of an extruded slab structure in which a hydraulic force of a hydraulic propulsion jack that disperses a bearing stress generated by a propulsion force of a hydraulic propulsion jack propelling an extrusion slab structure And more particularly, to an extruding apparatus having a stress adjusting type spreader beam assembly and a method thereof.

Currently, the top slab construction in domestic composite bridges is mostly on-site casting method in which wooden beams are installed between girders (steel box girder, plate girder, etc.), temporary casting is placed thereon and reinforcement and concrete are placed. This kind of on-site pouring method requires a long period of time, such as installation of concrete and construction of dies, and the labor cost is increased due to the need of a lot of manpower and lack of skilled technical personnel The quality control is deteriorated.

Also, in the case of steel composite bridges, most of the construction of the upper slab is either temporary / permanent or mobile, or some precast slabs are used. Since the existing upper slab construction works on the steel box girder installed at the elevation angle, the worker frequently falls down to the lower part of the bridge, and high construction cost / construction period and quality deterioration problems are occurring.

In particular, in the case of temporary / left-in-place form, cracks are generated on the contact surface with the cast concrete, and the slab thickness becomes excessive due to the application of the design rule for the composite slab, And the increase of the dead load due to the number of workers, the cross-sectional bending stiffness is disadvantageous, and there is a problem in safety such as a fall caused by work in a high-altitude operation.

In addition, in the case of a movable formable system, it is necessary to further reinforce the steel frame to prevent twisting due to the eccentric load, There is a problem in durability such that a space access path is required and a plurality of holes are generated in the slab by the form support member.

In addition, in the case of precast slab segments, the division size due to obstacles in transportation is limited, installation of the longitudinal tent is required due to a large number of construction connections, and construction cost is increased when a ground crane is used .

As an alternative to these problems, there is a method of manufacturing and extruding an upper slab at the back of the precast deck or in the middle of the bridge or the bridge. At this time, the precast deck can produce high-quality spheres through long-term curing, shape stability, precise dimensions, and industrialized molding processes. However, since the size of the transportable segments is small, Since the upper slab is integrated with the longitudinal steel wire, special care must be taken to prevent corrosion of the steel wire.

Especially, in the upper slab extrusion method, a certain length of the upper extruded slab is formed at the center of the alternate back or span, and then extruded continuously over the girder of the bridge, and then the shear connection material is installed to form the composite with the girder.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram illustrating a typical method of constructing an upper slab by extrusion.

1, in a conventional continuous extrusion method, an extrusion work station 40, which is a segment manufacturing facility, is installed at a position where the rear of the alternation 31 or the bridge 32 can be easily manufactured, and a segment structure The upper slabs 10a to 10n are continuously formed on the steel box girder 20 in the direction in which the bridge is to be installed by the hydraulic propulsion jack as an extrusion device, So as to form a totally integrated bridge.

Specifically, Fig. 1 (a) shows a case in which a steel box girder 20 is provided on an alternate 31 and a first upper slab 10a to be extruded in an extrusion work station 40 in the rear of the alternate 31 FIG. 1B illustrates a second upper slab 10b after the second upper slab 10b is disposed behind the first upper slab 10a. 1 (c) shows the continuous extrusion of the first to sixth upper slabs on the upper part of the steel box girder 20. As shown in Fig. 1D shows that the first slabs 10a through 10n are pushed out from the top of the steel box girder 20 so that an upper slab is laid therebetween. ) And the upper flange of the steel box girder 20 after the extrusion is completed.

Such a continuous extrusion method does not require a tramp, and it completes the bridge by sequentially installing the segment structure at the manufacturing site. Therefore, it is easy to manage the construction by making the segment structure at a certain place with high work safety, Since the construction work can be carried out, the construction period is greatly shortened and the process management is easy.

In addition, since the formwork is mechanized, it is possible to assemble and disassemble quickly, and all the processes are performed at a certain place, so that it is possible to perform a skilled work with a small number of personnel, thereby making it possible to streamline the work.

In addition, it is especially economical when traversing deep valleys or rivers, where it is not easy to install the bridge because it does not require a bridge for supporting the bridge overhead structure from the ground. Therefore, there is an advantage that the air can be shortened.

The advantage of this method is that the same mold is repeatedly used for all the upper slab segments 10a-10n, and the concrete is laid at the same location, and each of the upper slab segments 10a-10n is connected by a reinforcing bar, It can be integrated.

2 is a view showing an extrusion mechanism in an extrusion method in which an upper slab of a steel composite bridge is constructed.

2, when the upper slab 10 is made up of three upper slab segments 10a, 10b and 10c, FIG. 2 a) shows that the first upper slab segment 10a is made and extruded, Figure 2b shows the second upper slab segment 10b being manufactured and extruded together with the first upper slab segment 10a and Figure 2c shows the third upper slab segment 10c, 1 and the second upper slab segment 10a, 10b. For example, the first to third upper slab segments 10a, 10b, 10c may be made to have a longitudinal length of 5 to 15 meters, at which time they are each extruded one segment at the end of the steel box girder 20 .

Subsequently, the extruded reinforced upper slab segments 10a, 10b and 10c are respectively combined with the upper flange of the steel box girder 20 to complete the extrusion installation.

Fig. 3 is a perspective view showing an extruding apparatus for an upper slab extrusion of a steel composite bridge according to a conventional technique, and Fig. 4 is a sectional view showing the extrusion slab and the hydraulic propulsion jack shown in Fig.

Referring to FIG. 3, an extruding apparatus for the upper slab extrusion of a steel composite bridge according to the prior art forms a shear pocket type upper slab in a steel composite bridge having a steel box girder 20 and an upper slab 10 (41), a propulsion jack fixing hole (43), a buried form and a pocket form, and the upper slab (10) is provided with an upper slab A fixed spreader beam 50 may be installed between the upper slab 10 and the propelling jack 42. The fixed spreader beam 50 may be installed between the upper slab 10 and the propelling jack 42,

The upper slab 10 is extruded on the upper flange along the direction of extrusion by fabricating the upper slab 10 in an extrusion workshop.

The propulsion jack 42 is disposed in a sheave pocket extrusion slab fabricating stand and continuously extrudes the upper slab segments 10a to 10n on which the front end pockets are formed on the upper flange of the steel box girder 20. [ That is, the upper slab segments 10a to 10n formed with the front end pocket portions are manufactured and continuously provided at the extrusion work site 40 in the alternate rear direction, and the propelling jacks 42, which are the extrusion apparatus, are provided at the upper portion of the steel box girder 20, The segments 10a to 10n are successively extruded.

The fabrication flange 41 is disposed at the top and is arranged along the extrusion direction to guide the extrusion of the upper slab 10, i.e., the upper slab segments 10a to 10n. The fabric to flange 41 is disposed along the direction of extrusion to guide the extrusion of the upper slab 10, and a buried formwork and a pocket formwork are disposed. At this time, a plurality of propelling jack fixing holes 43 for selectively fixing the propelling jacks 42 are formed on the fabrication flange 41.

4, the shear studs 60 are pre-welded respectively to the front pocket portion and the general portion on the upper flange before extrusion of the upper slab 10 to form the upper slab segment 10 and the shear stud 60, .

The buried form is placed in the extrusion slab workbench, forming a tunnel below the upper slab 10, and is embedded in the upper slab 10. A pocket die is temporarily fastened to the top of the buried die to form a shear pocket portion in the upper slab segment. That is, the pocket formwork is temporarily fastened to the top of the buried formwork to form the front end pocket portion of the upper slab 10, and then separated from the buried formwork.

Subsequently, when the upper slab segments 10a through 10n reach their final positions, the shear pockets are filled with non-shrinkable mortar to synthesize the upper slab segments 10a through 10n and the upper flange, respectively. That is, the upper slab 10 is synthesized with the steel box girder 20 by plugging into the high strength non-shrinking mortar.

FIG. 5 is a plan view showing a structure in which a bearing force of a hydraulic propulsion jack of a conventional technique is extruded using a fixed spreader beam assembly. FIG. 6 is a cross- Fig.

5, the hydraulic propulsion jack 42 is constituted by a pair of hydraulic cylinders, and the relative position is changed according to the gap or height deviation from the adjacent hydraulic propulsion jack 42, And more closely related.

5, the stress of the extruded slab 10 is distributed as a whole due to the distribution of the propulsion force of the fixed spreader beam assembly 50 during the propulsion of the hydraulic propulsion jack 42, Stress interference may occur, the center portion (hydraulic pushing portion) stress due to superimposition may increase, or a similar load may cause the earth pressure stress to increase.

The central portion between the pair of hydraulic propulsion jacks 42 is a portion of the front end joint (tunnel-shaped form) of the extrusion slab 10 that has a certain cross-section opened (block-out) and has the thinnest thickness. If the same load is applied from the hydraulic propulsion jack 42, the corresponding section having a small effective cross section will have a large creep stress.

6 (a), in the case of the fixed spreader beam assembly 50, when the load points by the pair of hydraulic propulsion jacks 42 are P1 and P2, the fixed spreader beam assembly 50 are the stress points, and the pressures such as R1 and R2 are distributed at the center. If 50% of the maximum thrust force of the hydraulic propulsion jack 42 is applied to P1 and P2 as shown in Fig. 6B, 25% of the earth pressure stress is distributed to both ends and the center portion, respectively.

As shown in FIG. 6C, when 100% of the maximum thrust force of the hydraulic propulsion jack 42 is applied to P1 and P2, 50% of the contact pressure stress can be distributed to the both ends and the center portion, respectively. If the same load is applied from the hydraulic propulsion jack 42, the corresponding section with a small effective cross section, that is, the central section, becomes a major cause of damage to the extruded slab 10 due to a large underpressure stress.

Korean Patent Publication No. 2008-112014 (Disclosure Date: December 24, 2008), entitled "Spreader Beam" Korean Patent No. 10-1347113 filed on Jun. 15, 2012, entitled "Extrusion Prediction Apparatus for Shear Pocket Type Slab Construction of Steel Composite Bridge" Korean Utility Model No. 2016-1775, published on May 25, 2016, entitled "Lifting Spreader Beam" Korean Registered Patent No. 10-432436 (Filing Date: July 28, 2000). Title of the Invention: "Quadrature Apparatus for Combining Extrusion for Launching a Bridge < RTI ID = 0.0 > Korean Registered Patent No. 10-565360 (filed on July 18, 2003). Title of the Invention: "Extrusion system for pushing upper girder in a bridge under a continuous extrusion method" Korean Patent Publication No. 2005-110454 (Published on November 23, 2005). Title of the invention: "Method of constructing bridge using box girder formwork system for IRM bridge" Korean Registered Patent No. 10-734418 (Filing Date: October 27, 2006). Title of the Invention: "Continuous extrusion construction method of a bridge having an upper section and a wider section using an upper girder segment making a bridge using an extrusion wall"

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and provides a hydraulic system for a hydraulic excavator in which the hydraulic pressure propulsion jack propelling an extruded slab structure is provided with a hydraulic pressure stress adjusting type spreader beam assembly, Which is capable of preventing damage of the extruded slab due to the applied pressure stress by distributing the slip of the slip in the even distribution or the differential distribution of the spreading slab.

It is another object of the present invention to provide a method and apparatus for adjusting the stress to adjust the stress balance in the structure within a range of the spreader beam when the structure pushing structure such as an extrusion slab is adjusted to reduce the stress in the structurally unfavorable part, The present invention is to provide an extrusion piping apparatus and a method of the same, which are capable of adjusting the stress so that a more stable position or an effective cross-sectional area can be securely secured.

As a means for achieving the above-mentioned technical object, an extrusion method with a pneumatic stress adjusting type spreader beam assembly of a hydraulic propulsion jack according to the present invention is characterized in that: (a) a pressurizing stress adjustment type between an extrusion slab Installing a spreader beam assembly; b) driving the hydraulic propulsion jack by a hydraulic system to apply a propulsion force to a first spreader beam of the spreader beam assembly; c) propelling the extruded slab through both end spacers on both sides of the first spreader beam; d) calculating a deflection amount of the first spreader beam; e) setting a thickness of a center gap thickness corresponding to a deflection amount of the first spreader beam; f) providing a center spacing member having a thickness between the spacers at both ends of the first spreader beam; And g) propelling the extruded slab with a maximum thrust force of the hydraulic propulsion jack through a second spreader beam at the upper end spacing and the upper portion of the middle spacing member, wherein the acupressure stress adjusting spreader beam assembly of step a) And the pressurizing stress generated by the thrust force applied to the extrusion slab is adjusted so as to be distributed in an even distribution or a differential distribution.

Here, the pressure-reducing stress-type spreader beam assembly includes a first spreader beam for transmitting a load by the hydraulic propulsion jack to an extrusion slab, and calculating a deflection amount corresponding to an impelling force of the hydraulic propulsion jack; A spacing member formed on both ends of the first spreader beam, the spacing member being a both-end spacing member for transmitting the driving force of the hydraulic propulsion jack; A second spreader beam disposed on the upper end of the gap member so as to be in direct contact with the extrusion slab; And a spacing member provided at a central portion between the both end spacing members and including a central spacing member for dispersing stress applied to the extrusion slabs.

Here, the center portion spacing member may be an evenly distributed center portion spacing member that adjusts the applied stress to an even distribution or a differential distribution center portion spacing member that adjusts the induced stress to a differential distribution.

Here, the differential distribution center spacing member reduces the propelling load at the point of the load point by the hydraulic propulsion jack and increases the magnitude of the load acting on the outer end face securing a sufficient cross-section, so that the balance of the pressurizing stress applied to the extrusion slab Lt; / RTI >

Here, the amount of deflection of the first spreader beam in the step d) is first applied when designing the spreader beam assembly, and in actual application, dispersion of the propulsion load is required according to the maximum propulsive force and permissive pressure stress of the hydraulic propulsion jack , And it is desirable to measure and apply actual deflection amount through load test.

Here, the both-end spacing material is subjected to a thrust load within a permissible supporter stress from the initial thrust point to the permissible thrust load point, and the central spacing member on the first spreader beam is subjected to an excessive load from a point exceeding the permissible supporter stress Whereby the position of the load point and the pressing stress against the same thrust force of the hydraulic propulsion jack are controlled.

According to another aspect of the present invention, there is provided an extruding apparatus having a pneumatic stress adjusting type spreader beam assembly of a hydraulic propulsion jack, comprising a pair of hydraulic cylinders driven by hydraulic pressure of a hydraulic system, A hydraulic propulsion jack installed on the flange manufacturing base of the extrusion work site and propelling the extrusion slab; And an acupressure stress adjusting type spreader beam assembly installed between the extrusion slab and the hydraulic propulsion jack for adjusting and distributing the acupressure stress caused by the thrust applied to the extrusion slab to an even distribution or a differential distribution, The stress adjusting type spreader beam assembly includes a first spreader beam for transmitting a load by the hydraulic propulsion jack to the extrusion slab and calculating a deflection amount corresponding to the thrust of the hydraulic propulsion jack; A spacing member formed on both ends of the first spreader beam, the spacing member being a both-end spacing member for transmitting the driving force of the hydraulic propulsion jack; A second spreader beam disposed on the upper end of the gap member so as to be in direct contact with the extrusion slab; And a spacing member provided at a central portion between the both end spacing members to disperse a stress applied to the extrusion slab.

According to the present invention, it is possible to distribute the pressurizing stress generated by the propulsion force of the hydraulic propulsion jack propelling the extruded slab structure to an even distribution or a differential distribution by installing the pressure-dependent stress adjusting type spreader beam assembly at the time of constructing the upper slab of the composite bridge , Thereby preventing the extrusion slab from being damaged by the applied pressure stress.

According to the present invention, it is possible to adjust the stress to be applied to the structure in the range of the spreader beam to adjust the stress so that the stress at the structurally unfavorable part can be reduced, The stress can be adjusted so that the stress at the portion where the securing of the cross-sectional area is advantageous can be greatly received.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram illustrating a typical method of constructing an upper slab by extrusion.
2 is a view showing an extrusion mechanism in an extrusion method in which an upper slab of a steel composite bridge is constructed.
3 is a perspective view showing an extrusion pouring apparatus for an upper slab extrusion for a steel composite bridge according to the prior art.
Fig. 4 is a sectional view showing the extrusion slab and the hydraulic propulsion jack shown in Fig. 3; Fig.
FIG. 5 is a plan view showing pushing stress of a hydraulic propulsion jack according to a conventional technique by extruding a structure using a fixed type spreader beam assembly. FIG.
Fig. 6 is a view showing that the pressing force of the hydraulic propulsion jack shown in Fig. 5 is fixed.
FIG. 7 is a flowchart illustrating an operation of an extrusion method with a pneumatic stress adjusting type spreader beam assembly of a hydraulic propulsion jack according to an embodiment of the present invention.
8 is a plan view showing extrusion of a structure using a spreader beam assembly that uniformly adjusts the pressurizing stress of the hydraulic propulsion jack according to the embodiment of the present invention.
FIG. 9 is a view showing a process of evenly adjusting pressurizing stress of the hydraulic propulsion jack shown in FIG. 8. FIG.
10 is a plan view showing a structure extruded by using a spreader beam assembly for differentially adjusting the pressurizing stress of the hydraulic propulsion jack according to the embodiment of the present invention.
FIG. 11 is a view showing a process of differentially adjusting pressurization stress of the hydraulic propulsion jack shown in FIG. 10; FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

[Extrusion Hypothesis Method with Hydraulic Propulsion Jack Adjustment Type Spreader Beam Assembly]

FIG. 7 is a flowchart illustrating an operation of an extrusion method using a pneumatic stress adjusting type spreader beam assembly of a hydraulic propulsion jack according to an embodiment of the present invention. FIG. 9 is a plan view showing a process of uniformly adjusting pressurizing stress of the hydraulic propulsion jack shown in FIG. 8, and FIG. 10 is a view FIG. 11 is a plan view showing a process of differentially adjusting the pressurizing stress of the hydraulic propulsion jack shown in FIG. 10; FIG. 11 is a plan view showing extrusion of a structure using a spreader beam assembly for differentially adjusting pressurization stress of the hydraulic propulsion jack;

Referring to FIGS. 7 to 11, an extrusion method with a pneumatic stress adjusting type spreader beam assembly of a hydraulic propulsion jack according to an embodiment of the present invention includes: first, an extrusion slab 100 to be propelled in an extrusion workshop, 200, a spindle beam assembly 300 (Spinning Beam) is installed as shown in FIG. 8 (S110).

8 and 10, the creep stress adjusting type spreader beam assembly 300 includes a first spreader beam 310, a both-end spacing member 320, a second spreader beam 330, Spacers 340,350.

The first spreader beam 310 transmits a load by the hydraulic propulsion jack 200 to the extrusion slab 100 and calculates a deflection amount corresponding to the propulsion force of the hydraulic propulsion jack 200 before the load distribution, The both end spacers 320 are spacers formed on both ends of the first spreader beam 310 to transmit the driving force of the hydraulic propulsion jack 200.

The second spreader beam 330 is disposed above the both end spacers 320 so as to be in direct contact with the extruded slab 100 after load distribution.

The central spacing members 340 and 350 are spacers provided at the central portion between the both end spacing members 320 to disperse the applied pressure stress applied to the extrusion slabs 100.

Here, the center portion spacers 340 and 350 may be uniformly distributed central portion spacers 340 that uniformly distribute the pressurization stress as shown in FIGS. 8 and 9, or may be formed as shown in FIGS. 10 and 11 And may be a differential distribution center spacing member 350 that adjusts the pressure stress to a differential distribution. Particularly, as shown in FIG. 9, the uniformly distributed center spacing member 340 has a stress shape similar to that of the spreader beam 50 of the fixed frame structure described above, and can adjust the stress accumulation phenomenon at the center portion. 11, the differential distribution center spacing member 350 reduces the pushing load at the point of the load point by the hydraulic propulsion jack 200 and acts on the outer cross section with a sufficient cross section secured By increasing the size of the load, it is possible to maintain the balance of the applied pressure applied to the extrusion slab 100.

Next, the hydraulic propulsion jack 200 is driven by a hydraulic system to apply driving force to the first spreader beam 310 of the spreader beam assembly 300 (S120). Here, the hydraulic system refers to an entire hydraulic system including a hydraulic pump for propelling and moving the extrusion slab 100, a hydraulic propelling jack, a hydraulic cylinder, and an operation panel.

Next, the extrusion slab 100 is propelled through the both end spacers 320 on both sides of the first spreader beam 310 (S130). Here, the extrusion slab 100 is constructed so as to continuously make a line of 5 to 15m units and to propel the extruded slab 100. Since the required propulsive force of the conventional extrusion system accumulates frictional force during propulsion of each span, It is not meaningful to apply the pneumatic stress adjusting type spreader beam assembly 300 according to the present invention and the structure size of the extrusion slab 100 is extended to increase the frictional force, It is planned and applied in advance so that it can proceed safely within the permissible bearing stress of the extrusion slab 100. [

Next, the deflection amount of the first spreader beam 310 is calculated (S140). At this time, the amount of deflection of the first spreader beam 310 is primarily applied when designing the spreader beam assembly 300, and is applied in accordance with the maximum thrust force and permissive stress of the hydraulic propulsion jack 200 It is desirable to measure the actual deflection amount by applying a load test to calculate the point at which the dispersion of the load is required. In other words, the stroke of the hydraulic propulsion jack 200 is set to be less than 1.0 m, and in the case of a 500 m bridge, 500 repetitive loads are applied to the hydraulic pressure propulsion jack assembly 300 during extrusion, Since the amount of deflection of the first spreader beam 310 may vary due to external environmental conditions, it is somewhat risky to consider only the calculation results. Therefore, the measurement data must be applied through the load test.

Next, the thickness of the center spacers 340 and 350 corresponding to the deflection amount of the first spreader beam 310 is set (S150).

Subsequently, center spacers 340 and 350 having thicknesses are installed between the both end spacers 320 on both sides of the first spreader beam 310 (S160).

Next, the extrusion slab 100 is propelled with the maximum thrust force of the hydraulic propulsion jack 200 through the second spacing beam 330 at the upper portion of the gap member 320 and the central gap members 340 and 350 (S170).

9 and 11, when a load is loaded through the hydraulic propulsion jack 200, a deflection deformation of the first spreader beam 310 proceeds a predetermined amount. At this time, assuming that the propulsion pressure portion of the hydraulic propulsion jack 200 is a load point, both ends of the first spreader beam 310 are regarded as stress point portions.

As shown in FIG. 9B, when the propulsion force of the hydraulic propulsion jack 200 is 50%, the deflection amount of the first spreader beam 310 is calculated to calculate H1. In this case, when a shim plate T-50% is provided at the center and H-H1 = shim plate thickness is set, and the propulsion force of the hydraulic propulsion jack 200 is applied at 100% Can have a dispersing effect as shown in Fig.

11 is a conceptual diagram for protecting the propulsion point of the hydraulic propulsion jack 200 and further distributing the propulsive force to the stable section.

11B, when the thrust force of the hydraulic propulsion jack 200 is 70%, the deflection amount of the first spreader beam 310 is calculated to calculate H2. When a shim plate T-70% is set at the center and the propulsion force of the hydraulic propulsion jack 200 is applied at 100%, the H-H2 = shim plate thickness is set. d) as shown in Fig.

Therefore, the pressurizing stress adjusting type spreader beam assembly 300 can be dispersed in an even distribution or a differential distribution by adjusting the bearing stress generated by the thrust applied to the extrusion slab 100.

Further, only the propulsive force exceeding the permissible thrust load due to the propulsion process being progressed and the propulsive load accumulating due to the allowable propulsive load (side pressure stress side) in consideration of the permissible supporter stress is placed at both ends of the first spreader beam 310, (Hydraulic propulsion unit). In other words, the both-end spacers 320 on both sides of the first spreader beam 310 are subjected to a thrust load within a permissible supporter stress from the initial propulsion time to the permissible thrust load stage, and the center spacers 340 and 350 By applying an excess load from a point exceeding the permissible supporter stress, the position of the load point and the supporter stress with respect to the same thrust force of the hydraulic propulsion jack 200 can be controlled.

[Extrusion Hypothesis System with Hydraulic Propulsion Jack Adjustment Type Spreader Beam Assembly]

Referring to FIGS. 8 and 10, an extruding apparatus having a pressurizing stress-regulating type spreader beam assembly of a hydraulic propulsion jack according to an embodiment of the present invention includes a hydraulic propelling jack 200 and a pressurizing stress adjusting type spreader beam assembly 300).

The hydraulic propulsion jack 200 is a pair of hydraulic cylinders driven by the hydraulic pressure of the hydraulic system, and is installed on the flange fabrication side of the extrusion work site and propels the extrusion slab 100.

 The pressurizing stress adjusting type spreader beam assembly 300 is installed between the extrusion slab 100 and the hydraulic propelling jack 200 and has a bearing stress generated by the propulsion force applied to the extrusion slab 100 And disperses it in an even distribution or a differential distribution.

Specifically, the pressurizing stress adjusting type spreader beam assembly 300 transmits a load by the hydraulic propulsion jack 200 to the extrusion slab 100, and calculates a deflection amount corresponding to the propulsion force of the hydraulic propulsion jack 200 A first spreader beam 310; A spacing member formed on both ends of the first spreader beam 310, the both ends spacing member 320 transmitting the driving force of the hydraulic propulsion jack 200; A second spreader beam (330) disposed on the upper end gap member (320) to directly contact the extrusion slab (100); And a central spacing member (340, 350) for dispersing a stress applied to the extrusion slab (100), the spacing member being provided at a central portion between the both end spacing members (320).

The shrink tension stress adjusting type spreader beam assembly 300 calculates the deflection amount of the first spreader beam 310 and sets the thickness of the center gap members 340 and 350 corresponding to the deflection amount of the first spreader beam 310 A thickness is set between both end spacers 320 on both sides of the first spreader beam 310 and a thickness of the second spreader beam 330 on the end spacers 320 and the central spacers 340, The pushing slab 100 can be propelled with the maximum thrust force of the hydraulic propulsion jack 200 through the hydraulic pushing jack 200.

At this time, the center gap members 340 and 350 may be an evenly distributed center member spacing member 340 that uniformly distributes the applied stress or a differential distribution center member spacing member 350 that adjusts the applied stress to a differential distribution In particular, the differential distribution center spacing member 350 reduces the propelling load at the point of the load point by the hydraulic propulsion jack 200 and increases the magnitude of the load acting on the outer cross- The balance of the applied stress applied to the slab 100 can be maintained.

As a result, according to the embodiment of the present invention, it is possible to provide a pressurized stress-adjusted spreader beam assembly at the time of constructing the upper slab of the composite bridge, thereby making it possible to distribute the pressurizing stress generated by the propulsion force of the hydraulic propulsion jack propelling the extruded slab structure, It is possible to prevent the extrusion slab from being damaged by the applied pressure stress.

According to the embodiment of the present invention, the stress is adjusted so that the stress of the structure during the pushing operation of the extrusion slab or the like is adjusted to balance the stress received from the structure within the range of the spreader beam, The stress can be adjusted so that the stress at the portion where the more stable position or the effective cross-sectional area is advantageously secured can be greatly received.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100: extruded slab (structure)
200: Hydraulic propulsion jack
300: Chiropractic Stress Adjustable Spreader Beam Assembly
310: first spreader beam
320: Both ends gap material
330: second spreader beam
340: Equal distribution center portion spacing material
350: Differential distribution center portion spacing material

Claims (10)

a) installing a pressurized stress spreader beam assembly (Spreader Beam) (300) between the extrusion slab (100) and the hydraulic propulsion jack (200) to be propelled in the extrusion workshop;
b) driving the hydraulic propulsion jack (200) by a hydraulic system to apply thrust to the first spreader beam (310) of the spreader beam assembly (300);
c) propelling the extrusion slab (100) through both end spacers (320) on both sides of the first spreader beam (310);
d) calculating a deflection amount of the first spreader beam (310);
e) setting a thickness of a central spacing member (340, 350) corresponding to an amount of deflection of the first spreader beam (310);
f) providing a central spacing member (340, 350) having a thickness between the both end spacers (320) on the first spreader beam (310); And
g) propelling the extrusion slab 100 with the maximum thrust force of the hydraulic propulsion jack 200 through the second spacing beam 320 and the second spreader beam 330 above the center spacing members 340, , ≪ / RTI &
The bearing pressure stress adjusting type spreader beam assembly 300 of the step a) adjusts the bearing stress generated by the driving force applied to the extrusion slab 100 to disperse the bearing pressure distribution in an even distribution or a differential distribution A method of extruding a hydraulic propulsion jack with a compression stressed spreader beam assembly. 2. The pneumatic stress-adjusting type spreader beam assembly (300) according to claim 1,
A first spreader beam 310 that transmits a load by the hydraulic propulsion jack 200 to the extrusion slab 100 and calculates a deflection amount corresponding to the propulsion force of the hydraulic propulsion jack 200;
A spacing member formed on both ends of the first spreader beam 310, the both ends spacing member 320 transmitting the driving force of the hydraulic propulsion jack 200;
A second spreader beam (330) disposed on the upper end gap member (320) so as to directly contact the extrusion slab (100); And
And a center portion spacing member (340, 350) for dispersing a pressurizing stress applied to the extrusion slab (100), wherein the spacing member is provided at a central portion between the both end spacing members (320) A method of extruding with a beam assembly. 3. The method of claim 2,
Wherein the center part spacing material (340, 350) is a uniform distribution center spacing material (340) for uniformly distributing the underpressure stress or a differential distribution center spacing material (350) for adjusting the underpressure stress to a differential distribution. A method of extruding with jack tensioning adjustable spreader beam assemblies. The method of claim 3,
The differential distribution center spacing member 350 reduces the propelling load at the point of the load point by the hydraulic propulsion jack 200 and increases the magnitude of the load acting on the outer cross- Wherein the pressure of the hydraulic pressure applied to the hydraulic excavator is maintained in a balanced manner. The method according to claim 1,
The deflection amount of the first spreader beam 310 in the step d) is primarily applied when designing the spreader beam assembly 300 and is applied to the maximum propulsion force and permissive pressurizing stress of the hydraulic propulsion jack 200 And the actual deflection amount is measured and applied by using a load-loading test, and the applied deflection amount is measured and applied to the sprue beam assembly. 6. The method of claim 5,
The center spacing member (340, 350) on the first spreader beam (310) receives the pushing load within the permissible supporting pressure stress from the initial spreading point (320) Wherein the position of the load point and the pressurizing stress of the hydraulic propulsion jack (200) are controlled by applying an excessive load from a point exceeding the stress, and the pressurization stress of the hydraulic propulsion jack (2). A pair of hydraulic cylinders driven by the hydraulic pressure of the hydraulic system; a hydraulic propulsion jack (200) installed on a flange fabrication base of the extrusion work station for propelling the extrusion slab (100); And
A bearing stress is generated between the extrusion slab 100 and the hydraulic propelling jack 200 and is generated by the driving force applied to the extrusion slab 100 to be dispersed in an even distribution or a differential distribution And an acupressure stress adjusting type spreader beam assembly (300), wherein the acupressure stress adjusting type spreader beam assembly (300)
A first spreader beam 310 that transmits a load by the hydraulic propulsion jack 200 to the extrusion slab 100 and calculates a deflection amount corresponding to the propulsion force of the hydraulic propulsion jack 200;
A spacing member formed on both ends of the first spreader beam 310, the both ends spacing member 320 transmitting the driving force of the hydraulic propulsion jack 200;
A second spreader beam (330) disposed on the upper end gap member (320) so as to directly contact the extrusion slab (100); And
And a center portion spacing member (340, 350) for dispersing a pressurizing stress applied to the extrusion slab (100), wherein the spacing member is provided at a central portion between the both end spacing members (320) A pushing apparatus with a beam assembly. 8. The method of claim 7,
The shrink tension stress adjusting type spreader beam assembly 300 calculates the deflection amount of the first spreader beam 310 and sets the thickness of the center gap members 340 and 350 corresponding to the deflection amount of the first spreader beam 310 And the thickness between the both end spacers 320 on the first spreader beam 310 is set and the thickness of the hydraulic pressure propulsion jack 200 is set through the both end spacers 320 and the central spacers 340, Wherein the pushing slab (100) is propelled by the maximum thrust force of the pushing slab (100). 8. The method of claim 7,
The central gap member (340, 350) is an evenly distributed central member spacing member (340) for uniformly distributing the pushing stress or a differential distribution central member spacing member (350) for adjusting the pushing stress to a differential distribution An extruding apparatus having a hydraulic tension jack adjustable spreader beam assembly. 10. The method of claim 9,
The differential distribution center spacing member 350 reduces the propelling load at the point of the load point by the hydraulic propulsion jack 200 and increases the magnitude of the load acting on the outer cross- Of the hydraulic excavation jack of the hydraulic excavation jack is maintained.

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