KR100881921B1 - Opening trapezoid steel synthetic ugirder construction technique - Google Patents

Abstract

An open-top steel box U-girder construction method is provided to reduce the amount of used steel material by decreasing the stress applied to the steel material. An open-top steel box U-girder construction method comprises the steps of: connecting a U-girder segment(10a) where positive moment exerts and a U-girder segment(10b) where negative moment exerts by using a splice(11); temporarily assembling an open-top steel box U-girder(10) in which concrete is not mixed; applying high-strength concrete(14) in a U-girder segment upper flange(12) first; applying concrete in a U-girder segment lower flange(20) secondarily; arranging a steel wire insertion sheath(24) in a U-girder segment upper flange(28) and a slab; applying to concrete in the U-girder segment upper flange and the slab thirdly; applying non-shrinkage concrete in the block-out part; inserting PS steel wire in the anchorage installed on the lower part of the slab; and pre-stressing the U-girder segment slab.

Description

Opening trapezoid steel synthetic girder construction technique

The present invention relates to a method for constructing an open-type steel composite U girder, in particular, by introducing a combination of concrete and steel and prestressing, by combining the advantages of concrete and steel to improve the economics and to implement a low height and long bridge bridge It relates to a formulation rigidity U girder construction method.

Conventional opening type steel girder reduces the steel usage of the upper flange compared to the steel box girder, so it is economical and secures the construction compared to the steel box girder.

However, the conventional opening type steel girder has a large economic increase due to the common usage of the steel bridge in the long span between the concrete girder due to the common characteristics of the steel bridge.

 Therefore, in order to reduce the use of expensive steel materials, it is urgently needed to develop a complex type of technology that can be realized economically and long-term by combining with relatively inexpensive concrete.

Therefore, the present invention was devised to solve the problems described above, by pouring high-strength concrete to the upper flange of the U girder segment of the part where the positive and the parent acting, and synthesized by the prestress appropriately to the PS steel wire The purpose of the present invention is to provide an opening-type steel composite U girder construction method that can reduce the amount of steel used by synthesizing concrete and prestressing to steel materials, and enables long-term realization at low cost.

According to the present invention, a method for constructing an open-type composite U girder according to the present invention includes a U girder segment and a top, bottom flange, and an abdomen in which a constant moment consisting of a top, a bottom flange, and an abdomen acts on the floor of an assembly site. U girder segment of the portion where the parent moment acts as a splicing of the U girder segment of the portion acting as a splice to be a totally open steel U girder, the U girder segment of the portion where the positive moment of the opening steel U girder acts High-strength concrete is poured into the upper flange, and the opening-type steel U girder is mounted on the pier alternately with a crane, and the U girder segment of the portion where the static moment acts and the U girder segment of the portion where the parent moment acts. Complete bolting of the part spliced by splice to integrally assemble the opening steel U girder, U girder segment of the portion where the parent cement of the apertured steel girder acts.Pour high strength concrete is poured into the bottom flange bottom plate to form a slab slab, and U of the portion where the parent cement of the apertured steel U girder acts. A steel wire insertion sheath is disposed on the girder segment upper flange and the bottom plate slab, and the U girder segment upper flange steel fixing part of the part where the parent cement of the opening steel U girder acts is blocked out, and the portion where the parent cement acts. The concrete is poured between the U girder segment upper flange and the bottom plate slab of the girder, and the PS steel wire is inserted into the steel fixing hole of the U girder segment upper flange of the portion where the parent cement of the opening steel U girder acts, and the prestress is applied. Introducing and pouring non-condensed concrete into the block-out portion to fill the A fixing unit is installed on the bottom surface of the bottom plate slab of the steel U girder, and a prestress is introduced into the U girder segment bottom plate slab of the portion where the parent moment acts by inserting and tensioning the PS steel wire in the fixing unit, and retaining the fixing unit. Characterized in that for installing the management fixing unit.

As described above, the method of constructing the open-type composite U girder according to the present invention has the following effects.

First, the present invention by introducing the synthesis and pre-stress of concrete and steel in a way to reduce the steel consumption of the steel girder relatively, by combining the advantages of the concrete and the advantages of the steel to improve the economics and implement the bridge between the low and long There are advantages to it.

Second, the present invention is synthesized by pouring a high-strength concrete to the U girder segment upper flange of the portion where the moment acts and the U girder segment lower flange of the portion where the parent moment acts, and the top of the U girder segment of the portion where the parent moment Pre-stress is applied to the U girder segment bottom slab of the flange and the parent part with the PS steel wire to reduce the amount of steel used by the synthesis of the concrete and the prestress to the steel, reducing the usage of the steel, There are advantages to implement.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

1A to 1I are process diagrams showing the procedure for constructing an open-type steel composite U girder according to the present invention.

As shown in these drawings, the opening-type steel composite U girder construction method according to the present invention is the U girder of the portion where the constant moment consisting of the upper, lower flanges (12, 21) and the abdomen 50 acts at the floor of the assembly site Segment 10a and the U girder segment 10b of the portion where the parent moment consisting of the upper and lower flanges 28 and 20 and the abdomen 50 are actuated by splicing 11 are interconnected to form concrete. Is pre-assembled so as to form an opening-type steel U girder 10 in a non-synthesized state, and the high strength concrete 14 is applied to the upper girder segment 12 of the U girder segment of the portion where the positive moment of the opening-type steel U girder 10 acts. Is poured into the first stage, and the opening-type steel U girder 10 is mounted on the alternating 16 and the pier 18 by a crane, and the U girder segment 10a and the parent of the portion where the static moment acts. U girder segment 10b where U-girder segment of the part where the parent steel of the opening-type steel U girder 10 acts integrally by integrally bolting the part bolted by the splice 11 between Secondary high-strength concrete 14 is poured into the bottom plate 22 of the lower flange 20 to form concrete 14 at the bottom of the U girder segment lower flange where the parent moment acts, and the opening steel U A steel wire inserting sheath 24 is disposed on the U girder segment upper flange 28 and the bottom plate slab 26 at which the parent moment of the girder 10 acts, and the parent of the opening steel U girder 10 is arranged. U girder segment upper flange 28 of the section where the action acts block out the portion 32 of the steel fittings 30, U girder segment upper flange 28 and the bottom plate slab 26 of the part where the parent acts High-strength or general strength concrete in all sections The pre-stress is introduced by inserting and tensioning the PS steel wire 34 into the steel fitting hole 30 of the U girder segment upper flange 28 of the portion where the parent moment of the opening steel U girder 10 acts. And the non-condensed concrete is poured into the block-out portion 32, and the fixing unit 36 is provided on the bottom surface of the bottom plate slab 26 of the opening steel U girder 10, and the fixing unit ( The prestress is introduced into the U girder segment bottom plate slab 26 of the portion where the parent moment acts by inserting and tensioning the PS steel wire 34 into the 36, and the maintenance fixing unit 38 in the fixing unit 36. Install it.

That is, the opening-type steel composite U girder construction method according to the present invention

1) The U girder segment 10a of the part where the static moment acts as a component of the opening steel U girder 10 and the U girder segment 10b of the part where the parent moment acts are manufactured and brought into the site assembly site. Thereafter, the U girder segment 10a of the portion where the constant moment acts and the U girder segment 10b of the portion where the parent moment acts are temporarily bolted to the splice 11 so as to form the opening steel U girder 10 as a whole. Assemble

2) After the high-strength concrete 14 is poured into the U-girder segment upper flange 12 of the part where the static moment of the assembled opening-type steel U girder 10 acts, the alternating 16 and the piers 18 By mounting, the rigid composite upper flange absorbs the compressive stress generated in the U girder segment upper flange 12 of the portion where the constant moment acts.

In this case, the high-strength concrete 14 synthesized in the U-girder segment upper flange 12 of the portion where the constant moment acts is synthesized into a uniform section of constant thickness or the section 40 where the maximum moment of the middle portion of the inter-section is applied. Combined into thicker edges.

Here, in the case of the cross-sectional synthesis, the concrete thickness control can more efficiently control the compressive stress generated in the U girder segment upper flange 12 of the portion where the constant moment acts.

3) The bottom plate slab (26) in the direction perpendicular to the axial axis in the concrete in which thicker concrete is poured in the section 40 in the section 40 where the maximum moment is applied to the center center of the U girder segment 10a of the portion where the positive moment acts. Reinforcing bar reinforcing hole 44 is formed by the resin-based pipe to facilitate reinforcement.

4) The high strength concrete 14 is poured into the inner lower flange of the inner branch so that the rigid lower flange absorbs the compressive stress generated in the U girder segment lower flange 20 of the portion where the parent moment acts.

In this case, the high-strength concrete 14, which is synthetically attached to the U girder segment lower flange 20 of the portion where the parent moment acts, is poured into a uniform section of a uniform thickness, or a section in which the maximum parent moment close to the inner branch portion acts ( 42) is formed with the edge of the concrete to thicken.

Here, in the case of the cross-sectional synthesis can be more efficiently control the compressive stress generated in the inner portion by adjusting the thickness of the concrete.

5) Concrete diaphragm 48 at the lower end of the neutral shaft of the inner point steel diaphragm 46 in addition to the uniform cross-section synthesis or the cross-sectional composition to the U-girder segment lower flange 20 of the portion where the inner branch portion parent moment acts. ) Can be further synthesized to increase the eccentric efficiency by pulling down the center axis of the area where the parent moment acts.

6) After pouring high-strength concrete 14 to the U-girder segment lower flange 20 of the portion where the inner branch part acts, the U-girder segment upper flange 28 and the bottom plate of the part where the parent part acts. Concrete is poured into the slab 26 at the same time.

In this case, the fixing unit 36 and the sheath 24 and the PS steel wire 34 of the PS steel wire 34 for prestress introduction are pre-installed in the U girder segment upper flange 28 of the portion where the parent acts. Blocking portion 32 of the fixing unit 36 of the PS steel wire 34.

Sheath 24 and PS steel wire 34 including a maintenance fixing unit 38 on the bottom surface of the bottom slab 26 for pre-stressing the U girder segment bottom plate slab 26 at the portion where the parent moment acts. ) And the fixing unit 36 are installed.

7) Tension of the PS steel wire 34 at the block-out 32 portion of the U girder segment upper flange 28 of the portion where the parent moment acts to the concrete of the U girder segment upper flange 28 of the portion where the parent moment acts. Prestress is introduced, the block-out 32 is poured into non-condensed concrete, and the PS steel wires are formed at the fixing unit 36 located under the concrete of the U girder segment bottom plate slab 26 where the parent moment acts. Tension 34 is applied to the pre-stress to the U girder segment bottom plate slab 26 of the portion where the parent acts to control the tensile crack at the top of the point.

The maintenance fixing unit 38 purchases only the sheath 24 so that the PS steel wire 34 and the steel fixing fitting 30 are integrally installed and installed in the future maintenance, and the steel fixing fitting 30 is formed of concrete. This reduces the initial installation cost of the maintenance system.

8) The high-strength concrete 14 of a certain thickness is poured into the U girder segment abdomen 50 of the portion where the parent moment acts to allow the composite synthetic abdomen to absorb the shear stress generated in the abdomen around the point.

On the other hand, according to the present invention, the method of constructing the open-type steel composite U girder according to the present invention is characterized in that the high-strength concrete ( 14) primary casting is put into equilateral section, connected to the U girder segment (10b), the connecting steel sheet and the high-strength bolt of the part where the parent acts, mounted together in the alternating (16), piers (18), and then Secondary fusion of high-strength concrete (14) in the same section on the U-girder segment lower flange (20) of the part where the parent part acts, and the U-girder segment upper flange (28) and the bottom of the part where the parent part acts U-girder segment upper part of the part where the parent moment acts, and U-girder segment of the part where the parent moment acts It introduces a prestress into PS liner on the floor slab 26 of concrete.

In addition, according to the present invention, the method of constructing the open-type steel composite U girder according to the present invention is performed by applying a high-strength concrete to the U-girder segment upper flange 12 of the portion in which the static moment of the open-type steel U girder 10 does not work. 14) First casting, but the maximum moment is applied in the outer span 0.2L section in both directions at 2L / 5 points at the alternating point and 0.2L section in both directions at 1L / 2 point at the pier point in the inner span. In the section 40, the high-strength concrete 14 is poured thicker composite to change the cross-section to connect and assemble the U girder segment 10b and the connecting steel plate and the high-strength bolt of the portion where the parent moment acts, alternately together 16 After mounting on the pier 18, secondary casting of high-strength concrete 14 to the U-girder segment lower flange 20 of the portion where the inner branch portion parent acts, but 0.1L section in both directions from the pier branch portion In the section 42 where the maximum parent moment acts, the high-strength concrete 14 is thickened and synthesized to change the cross section, and the U girder segment upper flange 28 and the bottom plate slab 26 of the part where the parent moment acts. ) U-girder segment upper flange of the part where the parent moment acts after the 3rd pour of high-strength or general-strength concrete is synthesized over the entire span (28) U girder segment bottom plate slab (26) Prestress is introduced into the concrete with PS steel wire.

Then, the casting of the concrete to the U girder segment upper flange 28 of the portion where the parent acts at the same time when the high-strength concrete 14 is poured into the U girder segment 10a of the portion where the moment acts U-girder segment of batch high strength concrete 14 and U-girder segment of the portion where the parent moment acts Pre-stressed into the PS flanges 34 in the upper flange 28 concrete in advance 10a) and the U girder segment 10b of the portion where the parent moment acts are mounted on the alternating 16 and the piers 18.

In addition, in the outer span, the section 40 where the maximum moment is applied, which is 0.2L section in both directions at 2L / 5 points at the alternating point and 0.2L section in both directions at 1L / 2 point, at the pier point in the inner span For high strength concrete 14, which is placed thicker on the U-girder segment upper flange 12 of the section where the cement acts, the reinforcement for the reinforcement at regular intervals in the lateral direction so that the reinforcing bars of the bottom slab 26 can be reinforced in the direction perpendicular to the throttle. The through hole 44 is formed.

The PS steel wire fixing unit 36 is installed on the lower surface of the bottom plate slab 26 as a concrete block integrated with the maintenance fixing unit 38, and the maintenance fixing unit 38 is later maintained. Only the sheath 24 is installed so that the PS steel wire 34 and the steel fixing hole 30 can be inserted, and the steel fixing device 30 is installed in the maintenance fixing unit 38 when maintenance is required, and the steel The PS steel wire 34 is inserted into the fixing unit 30.

In addition, high-strength concrete 14 is poured into the U girder segment abdomen 50 of the portion where the parent moment acts.

The open steel U girder 10 is applied to the open plate steel plate U girder or open type corrugated steel plate U girder.

In addition, the prestress introduction is applied to steel I-girder, truss girder.

In addition, a plate steel plate is used as an abdomen for the U girder segment 10a of the portion where the positive moment of the steel U girder 10 acts, and a corrugated steel sheet is provided as an abdomen for the U girder segment 10b of the portion where the parent moment acts. The mixing structure or the U-girder segment 10a of the portion where the positive moment acts is a corrugated steel sheet, and the U-girder segment 10b of the portion where the parent moment acts is a plate steel sheet.

In addition, the diaphragm installed in the inner point portion of the opening-type steel U girder 10 is composed of a concrete diaphragm 48 at a predetermined height below the neutral axis, and the steel diaphragm above the concrete diaphragm 48. Install (46).

Hereinafter, the present invention will be described in more detail with reference to various embodiments.

[First Embodiment]

FIG. 2 is a side view showing the first embodiment of the opening type composite U girder according to the present invention, FIG. 3 is an enlarged cross-sectional view of the portion “A” of FIG. 2, and FIG. 4 is the portion “A” of FIG. 2. 5 is an enlarged cross-sectional view of part "B" of FIG. 2, and FIG. 6 is an enlarged side view of part "B" of FIG. 2.

As shown in these figures, according to the present invention, the method of constructing the open-type composite U-girder according to the present invention, by pouring the high-strength concrete 14 to the U-girder segment upper flange 12 of the portion where the constant moment acts, alternately 16. After placing on the pier 18, the high-strength concrete 14 is poured into the U-girder segment lower flange 20 of the portion where the parent moment acts, and then the U-girder segment upper flange 28 of the portion where the parent moment acts. The slab slab (26) concrete is placed in a batch, and the U girder segment upper flange (28) of the portion where the parent moment acts and the prestress is applied to the U girder segment bottom plate slab (26) where the parent moment acts. Introduce.

Here, the thickness of the U girder segment upper flange 12 and the U girder segment lower flange 20 of the portion where the parent moment acts is poured into a uniform section.

Second Embodiment

FIG. 7 is a side view showing a second embodiment of the opening type composite U-girder according to the present invention, FIG. 8 is an enlarged cross-sectional view of part “C” of FIG. 7, and FIG. 9 is part “C” of FIG. 7. Is an enlarged side view, FIG. 10 is an enlarged cross-sectional view of part "D" of FIG. 7, and FIG. 11 is an enlarged side view of part "D" of FIG. 7.

As shown in these figures, according to the present invention, the method of constructing the open-type composite U-girder according to the present invention, by pouring the high-strength concrete 14 to the U-girder segment upper flange 12 of the portion where the constant moment acts, alternately 16. After placing on the pier 18, the high-strength concrete 14 is poured into the U-girder segment lower flange 20 of the portion where the parent moment acts, and then the U-girder segment upper flange 28 of the portion where the parent moment acts. The slab slab (26) concrete is placed in a batch, and the U girder segment upper flange (28) of the portion where the parent moment acts and the prestress is applied to the U girder segment bottom plate slab (26) where the parent moment acts. Introduce.

Here, the thickness of the high-strength concrete 14 is poured into the cross-section of the U girder segment upper flange 12 and the U girder segment lower flange 22 of the portion where the parent moment acts.

Third Embodiment

FIG. 12 is a side view showing a third embodiment of the opening-type composite U-girder according to the present invention, FIG. 13 is an enlarged cross-sectional view of part “E” of FIG. 12, and FIG. 14 is part “E” of FIG. 12. Is an enlarged side view, and FIG. 15 is an enlarged cross-sectional view of part "F" of FIG. 12, and FIG. 16 is an enlarged side view of part "F" of FIG. 12.

As shown in these figures, according to the present invention, the method for constructing an open-type composite U-girder according to the present invention is performed by pouring high-strength concrete 14 onto the U-girder segment upper flanges 12 and 28 of the part where the positive and parent moments act. U girder segment of the portion where the parent moment acts after the pre-stress is introduced into the upper flange 28 of the portion where the parent moment acts by the PS steel wire 34 and then placed on the alternating 16 and the piers 18. After pouring high-strength concrete 14 to the lower flange 20 and pouring the slab slab 26, the prestress is introduced into the concrete of the U girder segment bottom plate slab 26 where the parent moment acts. do.

Here, high-strength concrete 14 is poured into the U-girder segment upper flange 12 and the U-girder segment lower flange 22 of the portion where the parent moment acts to equi-sectional thickness.

Fourth Embodiment

FIG. 17 is a side view showing the fourth embodiment of the opening type composite U-girder according to the present invention, FIG. 18 is an enlarged cross-sectional view of the portion “G” of FIG. 17, and FIG. 19 is the portion “G” of FIG. 17. 20 is an enlarged cross-sectional view illustrating a portion "H" of FIG. 17 and FIG. 21 is an enlarged side view of a portion "H" of FIG.

As shown in these figures, according to the present invention, the method for constructing an open-type composite U-girder according to the present invention is performed by pouring high-strength concrete 14 onto the U-girder segment upper flanges 12 and 28 of the part where the positive and parent moments act. U girder segment of the portion where the parent moment acts after the pre-stress is introduced into the upper flange 28 of the portion where the parent moment acts by the PS steel wire 34 and then placed on the alternating 16 and the piers 18. After pouring high-strength concrete 14 to the lower flange 20 and pouring the slab slab 26, the prestress is introduced into the concrete of the U girder segment bottom plate slab 26 where the parent moment acts. do.

Here, high-strength concrete 14 is poured into the cross-sectional thickness of the U girder segment upper flange 12 and the U girder segment lower flange 20 of the portion where the parent moment acts.

On the other hand, Fig. 22 is a detailed cross-sectional view of the abdomen in which the high-strength concrete 14 is synthesized in the U-girder segment abdomen of the portion where the parent cement of the opening-type rigid synthetic U girder according to the present invention acts, and FIG. It is a detailed side view of the abdomen which synthesize | combined the high-strength concrete 14 to the U girder segment abdomen of the part to which the parent cement of the rigid synthetic U girder acts.

As shown in these figures, according to the present invention, the method of constructing the open-type composite U-girder according to the present invention further pours and combines the high-strength concrete 14 to the U-girder segment abdomen 50 of the portion where the parent moment acts.

Fig. 24 is a side view showing an opening-type composite U girder using a corrugated steel sheet abdomen of the U-girder segment abdomen of a portion where the parent cement of the opening-type composite U girder according to the present invention acts, and FIG. An enlarged view of portion "A" and FIG. 26 is an enlarged view of portion "B" of FIG. 24.

As shown in these drawings, in the method of constructing the open-type steel composite U girder according to the present invention, the open-type steel U girder 10 is applied to the open-form plate steel sheet U girder or open-form corrugated steel sheet U girder.

In addition, the synthesis of the high-strength concrete 14 to the U-girder segment upper flange 12 of the portion where the constant moment acts and the synthesis of the high-strength concrete 14 to the U-girder segment lower flange 20 of the portion where the parent moment acts. U girder segment upper flange 28 where concrete and parent moment acts. U girder segment bottom slab 26 where concrete and parent moment acts. The introduction of prestress to concrete also applies to steel type I girder and truss girder. Can be.

In addition, a plate steel plate is an abdomen in the U girder segment 10a of the portion where the positive moment of the opening steel U girder 10 acts, and a corrugated steel sheet is formed in the U girder segment 10b of the portion where the parent moment acts. Or a corrugated steel sheet on the U girder segment 10a of the portion where the positive moment acts, and a plate steel sheet on the U girder segment 10a of the portion where the parent moment acts. do.

FIG. 27 is a side view illustrating the steel composite composite diaphragm 1 of the opening type composite U girder according to the present invention, FIG. 28 is an enlarged view of a portion “A” of FIG. 27, and FIG. Is a detailed view of an enlarged portion "B" of FIG. 30 is a side view of the composite composite diaphragm 2 of the open-type composite U-girder according to the present invention, and FIG. 31 is a portion "A" of FIG. 32 is an enlarged detailed view, and FIG. 32 is an enlarged detailed view of a portion “B” of FIG. 30.

As shown in these figures, the opening-type steel composite U girder construction method according to the present invention is provided in the inner point portion of the U girder segment 10b of the portion where the parent cement of the opening-type steel U girder 10 acts. The diaphragm is composed of a concrete diaphragm 48 at a predetermined height below the neutral axis, and the steel diaphragm 46 is installed on the concrete diaphragm 48.

Opening composite steel girder construction method according to the present invention made as described above, by introducing a composite and pre-stressed concrete and steel in a way that can reduce the steel consumption of the opening steel U girder, the advantages of concrete and steel Combined with these advantages, it can improve economics and implement low bridges and long bridges, thereby reducing construction costs and achieving low bridges and long bridges at low cost.

In addition, according to the present invention, the opening-type rigid U-girder construction method includes high-strength concrete (U-girder segment upper flange 12 of the portion where the constant moment acts and U-girder segment lower flange 20 of the portion where the parent moment acts. 14), pre-stress is appropriately introduced into the U girder segment upper flange 28 of the portion where the parent moment acts, and the U girder segment bottom plate slab 26 of the portion where the parent action acts as a PS steel wire 34, Synthesis of concrete and prestress reduces the stress transferred to the steel, reducing the amount of steel used, there is an effect that can be implemented in the long-term between low cost.

1A to 1I are process diagrams showing a procedure for constructing an open-type steel composite U girder according to the present invention.

Figure 1a1 is a side view showing the opening-type steel U girder assembled state,

Figure 1a2 is a cross-sectional view taken along the line "A-A" of Figure 1a1,

Figure 1b1 is a side view showing the caisson concrete placed state on the upper flange of the U girder segment of the portion where the constant moment acts,

FIG. 1B2 is a sectional view taken along the line “A-A” of FIG. 1B1;

FIG. 1B3 is a sectional view taken along the line “B-B” of FIG. 1B1; FIG.

Figure 1c1 is a side view showing a state in which the opening steel U girder is mounted on the alternating, piers,

1C2 is a sectional view taken along the line “A-A” of FIG. 1C1;

1C3 is a cross-sectional view taken along the line “B-B” of FIG. 1C1;

Figure 1d1 is an exemplary view showing a state in which high-strength concrete is poured on the U-girder segment lower flange of the portion where the parent moment acts,

1D2 is a sectional view taken along the line “A-A” of FIG. 1D1;

FIG. 1D3 is a cross-sectional view taken along the line “B-B” of FIG. 1D1; FIG.

1D4 is a cross-sectional view taken along the line “C-C” of FIG. 1D1;

1E1 is an exemplary diagram showing a state where a steel wire is placed on a U girder segment of a portion where a parent moment acts;

FIG. 1E2 is a sectional view taken along the line “A-A” of FIG. 1E1;

1E3 is a cross-sectional view taken along the line “B-B” of FIG. 1E1;

1E4 is a cross-sectional view taken along the line “C-C” of FIG. 1E1;

1f1 is an exemplary view showing a slab concrete slab pouring state,

1F2 is a sectional view taken along the line “A-A” of FIG. 1F1;

1F3 is a cross-sectional view taken along the line “B-B” of FIG. 1F1;

1F4 is a cross-sectional view taken along the line “C-C” of FIG. 1F1;

Figure 1g1 is an exemplary view showing a state in which pre-stress is introduced to the U-girder segment upper flange concrete of the portion where the parent moment acts,

Figure 1g2 is a cross-sectional view taken along the line "A-A" of Figure 1g1,

Fig. 1G3 is a cross-sectional view taken along the line “B-B” of Fig. 1G1;

FIG. 1G4 is a cross-sectional view taken along the line “C-C” of FIG. 1G1; FIG.

1H1 is an exemplary view showing a state in which prestress is introduced into a U girder segment bottom plate slab of a portion where a parent moment acts;

Figure 1h2 is a cross-sectional view taken along the line "A-A" in Figure 1h1,

1H3 is a sectional view taken along the line “B-B” of FIG. 1H1;

Figure 1i1 is an exemplary view showing a packaging and protective measures installed state,

FIG. 1i2 is a cross-sectional view taken along the line “A-A” of FIG. 1i1; FIG.

Figure 2 is a side view showing a first embodiment of the open-type composite U-girder according to the present invention,

3 is an enlarged cross-sectional view of part “A” of FIG. 2;

4 is an enlarged side view of portion “A” of FIG. 2;

FIG. 5 is an enlarged cross-sectional view of part “B” of FIG. 2;

FIG. 6 is an enlarged side view of part “B” of FIG. 2;

FIG. 7 is a side view showing a second embodiment of the opening type composite U girder according to the present invention; FIG.

FIG. 8 is an enlarged cross-sectional view of part “C” of FIG. 7;

FIG. 9 is an enlarged side view of part “C” of FIG. 7;

FIG. 10 is an enlarged cross-sectional view of part “D” of FIG. 7;

FIG. 11 is an enlarged side view of part “D” of FIG. 7;

12 is a side view showing a third embodiment of the open-type composite U-girder according to the present invention;

FIG. 13 is an enlarged cross-sectional view of part “E” of FIG. 12;

FIG. 14 is an enlarged side view of part “E” of FIG. 12;

15 is an enlarged cross-sectional view of a portion “F” of FIG. 12;

FIG. 16 is an enlarged side view of part “F” of FIG. 12;

17 is a side view showing a fourth embodiment of the open-type composite U-girder according to the present invention;

FIG. 18 is an enlarged cross-sectional view of part “G” of FIG. 17;

FIG. 19 is an enlarged side view of part “G” of FIG. 17;

20 is an enlarged cross-sectional view of a portion “H” of FIG. 17;

FIG. 21 is an enlarged side view of part “H” of FIG. 17;

Fig. 22 is a detailed cross-sectional view of the abdomen in which high-strength concrete is synthesized in the abdomen of the U girder segment of the portion where the parent cement of the aperture-type rigid U girder according to the present invention acts;

Fig. 23 is a detailed side view of the abdomen in which high-strength concrete is synthesized in the U-girder segment abdomen of the portion where the parent cement of the opening-type steel composite U-girder according to the present invention acts;

Fig. 24 is a side view showing an opening type compounding U girder using a corrugated sheet abdomen of the U girder segment abdomen of the portion where the parent cement of the opening type compounding U girder according to the present invention acts;

25 is an enlarged detailed view of a portion “A” of FIG. 24;

FIG. 26 is an enlarged detailed view of a portion “B” of FIG. 24;

FIG. 27 is a side view of the composite composite diaphragm 1 of the opening type composite U girder according to the present invention; FIG.

FIG. 28 is an enlarged detailed view of a portion “A” of FIG. 27;

FIG. 29 is an enlarged detailed view of a portion “B” of FIG. 27;

30 is a side view of the composite composite diaphragm 2 of the open-type composite U-girder according to the present invention;

31 is an enlarged detailed view of a portion “A” of FIG. 30;

32 is an enlarged detailed view of a portion “B” of FIG. 30;

Explanation of symbols on the main parts of the drawing

10: Opening Steel U Girder
10a: U girder segment at the point where the constant moment acts
10b: U girder segment where the parent works
11: splice
12: U-girder segment upper flange of the part where the constant moment acts

14: high strength concrete 16: shift

18: Pier
20: U-girder segment lower flange of the part where the parent moment acts
21: U-girder segment lower flange of the part where the constant moment acts

22: bottom plate 24: sheath

26: soleplate slab
28: U-girder segment upper flange of the part where the parent moment acts

30: steel stop 32: blockout

34: PS steel wire 36: Fusing unit

38: Fusing Unit for Maintenance
40: Section where maximum static moment acts

42: interval at which the maximum parent works
44: through hole

46: steel diaphragm 48: concrete diaphragm

50: abdomen 60: virtual slab slab concrete line

70: corrugated steel sheet 80: shear connector

Claims (11)

From the bottom of the assembly site to the U girder segment (10a), the upper, lower flanges (28, 20) and the abdomen 50 of the portion where the constant moment consisting of the upper, lower flanges (12, 21) and the abdomen 50 acts Temporarily assembling the U girder segment 10b of the portion where the parent moment acts to the splice 11 and interconnecting it to form an opening-type steel U girder 10 in which concrete is not synthesized as a whole. The high-strength concrete 14 is first poured into the U-girder segment upper flange 12 of the portion where the moment of the formulation steel U-girder 10 acts, and the opening-type steel U girder 10 is alternately replaced by a crane ( 16) mounted on the piers 18, and gabored by a splice 11 between the U girder segment 10a of the portion at which the static moment acts and the U girder segment 10b of the portion at which the parent moment acts. The part is completely bolted to open the steel U girder (10). The high strength concrete 14 is poured into the bottom plate 22 of the U girder segment lower flange 20 at the portion where the parent cement of the opening steel U girder 10 acts, and then the parent cement Concrete 14 is formed at the bottom of the U girder segment lower flange of the acting portion, and the U girder segment upper flange 28 and the bottom plate slab 26 at the parent moment of the opening steel U girder 10 act. Steel wire insertion sheath 24 is disposed, and the U girder segment upper flange 28 of the portion where the parent cement of the opening-type steel U girder 10 acts is block-out 32. The high-strength or general strength concrete is poured into the entire section of the U girder segment upper flange 28 and the bottom plate slab 26 where the parent moment acts, and the parent of the opening steel U girder 10 U edge where the cement acts The PS steel wire 34 is inserted and tensioned into the steel fitting opening 30 of the segment upper flange 28 to introduce prestress, and the non-shrink concrete is poured into the block-out portion 32 to fill the steel U. U girder segment of the portion where the fixing unit 36 is installed on the bottom surface of the bottom plate slab 26 of the girder 10, and the PS steel wire 34 is inserted into the fixing unit 36 and tensioned to act as a parent. A pre-stress is introduced into the bottom plate slab (26), and a fixing unit (38) for maintenance is installed in the fixing unit (36). The parent moment acts by first-casting the high-strength concrete (14) in the same section on the U-girder segment upper flange (12) of the portion where the static moment of the opening-type steel U girder (10) in the state where concrete is not synthesized is applied. U girder segment 10b of the part to be connected and assembled by connecting steel plate and high-strength bolt, mounted together in the alternating 16, the pier 18, and then the U girder segment lower flange of the portion where the inner branch portion parent acts Secondary casting of high-strength concrete (14) on the same section in (20) and high-strength or general-strength concrete on the entire span of the U-girder segment upper flange (28) and the bottom plate slab (26) where the parent moment acts. U girder segment upper flange (28) of the part where the parent moment acts, and the U girder segment bottom plate slab (26) of the part where the parent part acts prestressed to concrete Opening type rigid U-girder construction method characterized in that the introduction. The primary casting of high-strength concrete 14 to the U-girder segment upper flange 12 of the portion where the static moment of the opening-type steel U girder 10 in the non-concrete state is applied, but in the outer span alternate point High-strength concrete (14) is thicker in the section (40) where the maximum moment is applied, which is 0.2L in both directions at point 2L / 5 and 0.2L in both directions at point 1L / 2 at the pier at inner bridge. After changing the cross section by combining the U girder segment (10b), the connecting steel plate and the high-strength bolt of the part where the parent acts, and mounted it on the alternating (16), pier (18) together, Secondary casting of high-strength concrete 14 to the U-girder segment lower flange 20 of the acting portion is performed, but high-strength concrete is applied to the section 42 where the maximum parent moment acting in 0.1L section in both directions from the pier point is applied. (14) to thicken the composite to change the cross-section, and to combine the high-strength or general-strength concrete in the entire span between the U-girder segment upper flange (28) and the bottom plate slab (26) of the portion where the parent acts. And then the pre-stress is introduced into the U girder segment upper flange 28 concrete at the portion where the parent moment acts and the U girder segment bottom slab 26 concrete at the portion where the parent moment acts as a PS steel wire. Formulation method of composite U girder construction. The method of claim 1, Synthesis of concrete on the U girder segment upper flange 28 of the portion where the parent acts is simultaneously batch high strength at the time of pouring the high-strength concrete 14 to the U girder segment 10a of the portion where the moment acts U girder segment 10a of the portion where the constant moment acts by pre-introducing pre-stress into the concrete with the PS steel wire 34 into the concrete. Method for constructing an open steel composite U-girder, characterized in that for mounting the open steel U-girder 10 connected to the U girder segment (10b) of the portion where the and the moment acts on the alternating 16, the bridge 18 . The method of claim 1, In the outer span, the upper flange of the section 40 where the maximum moment is applied, which is 0.2L in both directions at 2L / 5 points in the alternating point and 0.2L in both directions at 1L / 2 point in the inner point. 12) the high-strength concrete 14 to be thicker in the opening is characterized in that the reinforcing bar through hole 44 is formed at a predetermined interval in the transverse direction so that the reinforcement of the bottom plate slab 26 in the crosswise perpendicular direction Formulation method of composite U girder construction. The method of claim 1, The PS steel wire fixing unit 36 is installed on the lower surface of the bottom plate slab 26 as a concrete block integrated with the maintenance fixing unit 38, and the maintenance fixing unit 38 is for future maintenance. Only the sheath 24 is installed so that the PS steel wire 34 and the steel fixing fitting 30 can be inserted therein, and the steel fixing fitting 30 is installed in the maintenance fixing unit 38 when maintenance is required. Opening-type steel composite U-girder construction method characterized in that the PS steel wire 34 is inserted into the (30). The method of claim 1, A method of constructing an open-type composite U-girder, characterized in that the high-strength concrete (14) is poured into the U-girder segment abdomen (50) of the portion where the parent acts. The method of claim 1, The opening steel U-girder (10) is a steel composite U-girder construction method, characterized in that applied to the opening plate steel plate U girder or the open-form corrugated steel plate U girder. delete The method of claim 1, The plate steel plate is the abdomen in the U girder segment 10a of the portion where the positive moment of the opening steel U girder 10 acts, and the corrugated steel sheet is the abdomen in the U girder segment 10b of the portion where the parent moment acts. Or the corrugated steel sheet is abdominal to the U girder segment 10a of the portion where the constant moment acts, and the plate steel sheet is abdominally mixed to the U girder segment 10b of the portion to which the parent moment acts. Opening type steel composite U girder construction method characterized in that. The method of claim 1, The diaphragm installed in the inner point portion of the opening steel U girder 10 is composed of a concrete diaphragm 48 at a predetermined height below the neutral axis, and the steel diaphragm 46 on the concrete diaphragm 48. Opening type rigid U-girder construction method characterized in that the installation.

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