CN113445429A - Profiled steel sheet laying structure suitable for support-free construction of steel-concrete composite beam bridge - Google Patents
Profiled steel sheet laying structure suitable for support-free construction of steel-concrete composite beam bridge Download PDFInfo
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- CN113445429A CN113445429A CN202110806642.0A CN202110806642A CN113445429A CN 113445429 A CN113445429 A CN 113445429A CN 202110806642 A CN202110806642 A CN 202110806642A CN 113445429 A CN113445429 A CN 113445429A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/02—Bridges characterised by the cross-section of their bearing spanning structure of the I-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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Abstract
The invention relates to a profiled steel sheet laying structure suitable for the non-support construction of a steel-concrete composite beam bridge, which comprises a steel girder compression zone laying structure, a steel girder tension zone laying structure and a cantilever flange laying structure, wherein the steel girder compression zone laying structure, the steel girder tension zone laying structure and the cantilever flange laying structure respectively comprise a reinforced concrete bridge deck and a steel girder, two steel girder side faces of the steel girder compression zone laying structure, two steel girder side faces of the steel girder tension zone laying structure and a steel girder cantilever side of the cantilever flange laying structure are respectively provided with a supporting mechanism, a profiled steel sheet is arranged on the supporting mechanisms, and the reinforced concrete bridge deck is arranged on the upper surface of the profiled steel sheet. The profiled steel plate is thin and serves as a supporting template of the concrete bridge deck plate, so that the steel consumption is saved; the supporting mechanism is connected with the steel girder through at least two welding lines, so that fatigue cracking of the steel girder caused by single welding line or concentrated welding line is avoided, and the service life and the strength of the steel girder are ensured.
Description
Technical Field
The invention relates to the field of steel-concrete composite bridges, in particular to a profiled steel sheet laying structure suitable for the support-free construction of a steel-concrete composite bridge.
Background
The steel-concrete composite beam bridge has the advantages of steel consumption saving, light hoisting weight, convenient processing, good durability and the like, and is a common structural form for industrial construction of medium-span structural bridges. In the steel-concrete composite beam bridge, the combination of a steel box beam or a steel plate beam and a concrete bridge deck is the key of structural combination stress, the concrete bridge deck not only participates in the structural stress but also directly bears the load of wheels, and the construction method comprises two types of prefabrication and cast-in-place.
The cast-in-place bridge deck has good integrity, the bridge deck is tightly combined with a steel beam top plate (upper flange), and the construction of the shear connecting piece is convenient, so that the construction method is a common bridge deck construction method for the steel-concrete composite beam bridge. The cast-in-place concrete bridge deck is divided into two types of support cast-in-place and non-support cast-in-place, a bottom template needs to be erected on the traditional support cast-in-place bridge deck, the work is complicated, the risk of overhead operation is high, and the manufacturing cost is high; the construction without the support cancels a bottom formwork poured by the bridge deck slab, adds blocks to the construction progress, and is a bridge deck slab construction method which is expected to be popularized vigorously under the industrial background.
The existing bridge deck support-free construction method comprises a steel-concrete combined bridge deck construction method, a steel bottom plate bridge deck construction method and the like. However, no matter the steel bottom plate of the combined bridge deck slab or the steel bottom die used as the template, the thickness of the steel plate is 6-10 mm, the steel consumption is large, and the increase of the unit steel consumption enables the combined structure bridge not to have the cost advantage, and is not beneficial to popularization and use.
The profiled steel sheet has the characteristics of light dead weight, less steel consumption (the thickness of the profiled steel sheet used in the roof of a building is only 0.8-1.2 mm), high finished product quality and the like, and is applied to concrete pouring of the roof of a building at present. In the traditional house construction, the profiled steel plates are placed on the top surfaces of the ring beams, and for a steel-concrete composite beam bridge, due to the height influence (generally about 6cm wave height) of the profiled steel plates, the effective plate thickness of a concrete bridge deck can be weakened by adopting a method for placing the medium-pressure profiled steel plates in the house construction. Therefore, the reasonable arrangement mode of the profiled steel plates is to enable the profiled steel plates to fall below the top surfaces of the upper flanges of the steel beams so as to ensure the effective thickness of the concrete bridge deck. However, the arrangement of the profiled steel sheet below requires welding supporting connection accessories on the flange of the steel beam, the welding of the supporting connection accessories causes the problem of fatigue cracking of the flange of the steel beam, and one of the significant differences between the steel structure bridge and the concrete structure lies in the fatigue property of the steel structure members. Therefore, the problem that how to fix the profiled steel sheet as a template of a cast-in-place concrete bridge deck in the bracket-free construction without causing fatigue cracking is the focus and needs to be solved by the invention.
The existing steel-concrete composite bridges with application numbers of 202010373302.9, 201811570095.5, 200410051061.7, 202110027335.2 and 201710640860.5 all adopt profiled steel sheets to support concrete bridge floors, but the profiled steel sheets are directly paved on the upper surface of a main beam, and similar to a paving mode of traditional house construction, the problems that the effective plate thickness of a concrete bridge deck is low and the like still exist due to the high influence (wave height of about 6cm generally) of the profiled steel sheets. In addition, because the stress conditions of the rigid main beams at different positions of the beam bridge are different, the same laying method is adopted at all the positions in the prior art, a more reasonable supporting structure is not designed aiming at the stress condition of the rigid main beams, the profiled steel plates in partial regions reach the fatigue limit firstly, the profiled steel plates in partial regions reach the fatigue limit later, and the service lives of all the parts are unbalanced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a profiled steel sheet laying structure suitable for the support-free construction of a steel-concrete composite beam bridge, wherein the profiled steel sheet is used as a supporting template of a concrete bridge deck slab so as to save the steel consumption, ensure the effective slab thickness of the concrete bridge deck slab and prevent the fatigue cracking of a steel main beam, thereby ensuring the strength of the steel main beam.
The technical scheme adopted by the invention for solving the technical problems is as follows: the profiled steel sheet laying structure suitable for the support-free construction of the steel-concrete composite beam bridge comprises a steel girder compression zone laying structure, a steel girder tension zone laying structure and a cantilever flange laying structure, wherein the steel girder compression zone laying structure, the steel girder tension zone laying structure and the cantilever flange laying structure respectively comprise a reinforced concrete bridge deck and a steel girder with an I-shaped section formed by an upper flange, a lower flange and a web plate, two sides of the steel girder compression zone laying structure, two sides of the steel girder tension zone laying structure and the suspension side of the steel girder of the cantilever flange laying structure are respectively provided with a supporting mechanism, the supporting mechanisms are connected with the steel girder through at least two welding seams, a profiled steel sheet is arranged on each supporting mechanism, the highest point of the upper surface of the profiled steel sheet is at the same height as the upper surface of the upper flange, or the highest point of the upper surface of the profiled steel sheet is lower than the upper surface of the upper flange, the reinforced concrete bridge deck is arranged on the upper surface of the profiled steel sheet.
Preferably, the supporting mechanism of the steel girder compression area laying structure is an angle steel with an L-shaped section formed by a lateral toe and an upright toe, the upright toe is welded with the upper surface and the lower surface of the upper flange, and two ends of the profiled steel sheet are located on the lateral toes of the angle steel of two adjacent steel girders.
Further, the leg size of the weld is 4 to 6 mm.
Further, the length of the part of the profiled steel sheet on the lateral toe is greater than or equal to 50 mm.
Preferably, the supporting mechanism of the steel girder tension area laying structure comprises a J-shaped hook plate and T-shaped angle steel, a horizontal connecting plate is arranged at the top of the J-shaped hook plate, two side edges of the connecting plate are welded with the lower surface of an upper flange, the lower part of a vertical angle toe of the T-shaped angle steel is inserted into the J-shaped hook plate, the upper end of the vertical angle toe of the T-shaped angle steel extends to the upper part of the upper flange, a pull rod is arranged on the upper surface of the upper flange, and two ends of the pull rod are welded with the vertical angle toes of the T-shaped angle steel on two sides of the upper flange. The end part of the profiled steel sheet is positioned on the horizontal angle toe of the T-shaped angle steel.
Further, the distance from the welding seam between the connecting plate and the upper flange to the edge of the upper flange is larger than or equal to 15 mm.
Further, the hook depth of the J-shaped hook plate is greater than or equal to 30 mm.
Preferably, the supporting mechanism of the cantilever flange laying structure comprises a plurality of cantilever beams with I-shaped cross sections, the top plate and the upper flange of each cantilever beam are welded, the middle vertical plate and the bottom plate of each cantilever beam are welded with the web plate of each steel main beam, an outer hanging plate with an L-shaped cross section is arranged on the upper surface of one end, away from each steel main beam, of each cantilever beam, two ends of each profiled steel plate are located on the two adjacent cantilever beams, and the side, away from each steel main beam, of each profiled steel plate is located on the outer hanging plate.
Furthermore, the profiled steel sheet is close to the side of steel girder and is provided with the end plate, the end plate is laminated with the last flange side of steel girder, and is provided with a plurality of through-holes (elliptical holes) evenly distributed in length direction on the end plate, crosses decking bottom atress reinforcing bar in the through-hole, forms the trompil board structure.
Furthermore, a plurality of rows of shear nails are arranged on the cantilever beam, and the upper ends of the shear nails penetrate through the profiled steel sheet and are buried in the reinforced concrete bridge deck as connecting pieces.
The invention has the beneficial effects that: 1. the profiled steel plate is thin in thickness, the profiled steel plate is used as a supporting template of the concrete bridge deck plate to save steel consumption, for the steel-concrete composite beam bridge with the pier height within 15m, the cost for the concrete bridge deck plate support in the cast-in-place process is about 230 yuan per square meter, the cost for the steel bottom plate with the thickness of 6mm used as a template of a bottom die is about 420 yuan per square meter, and the cost for the bottom die with the galvanized profiled steel plate with the thickness of 1.2mm used for construction without a support is about 55 yuan per square meter. Compared with the cost, the construction scheme of the profiled steel sheet non-support bridge deck slab has obvious cost advantage. 2. The supporting mechanism is connected with the steel girder through at least two welding lines, so that fatigue cracking of the steel girder caused by single welding line or concentrated welding line is avoided, and the service life and the strength of the steel girder are ensured. 3. Because the highest point of the upper surface of the profiled steel sheet is at the same height as the upper surface of the upper flange, or the highest point of the upper surface of the profiled steel sheet is lower than the upper surface of the upper flange, the effective thickness of the reinforced concrete bridge deck is ensured on the premise of not increasing the elevation of the upper surface of the reinforced concrete bridge deck, so that the bridge deck can meet the bearing requirements.
Drawings
FIG. 1 is a schematic diagram of a first embodiment;
FIG. 2 is an enlarged view of part A in the first embodiment;
FIG. 3 is a schematic view of the second embodiment;
FIG. 4 is an enlarged schematic view of part B in the second embodiment;
FIG. 5 is a schematic view of a third embodiment;
FIG. 6 is an enlarged schematic view of part C in the third embodiment;
reference numerals: 1-upper flange; 2-lower flange; 3, welding; 4-profiled steel sheet; 5, angle steel; 6-J hook plate; 7-reinforced concrete bridge deck slab; 8-T-shaped angle steel; 9-connecting plates; 10-a pull rod; 11-cantilever beam; 12-an external hanging plate; 13-an end plate; 14-a through hole; 15-shear pin.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The steel-concrete composite bridge is divided into a plurality of regions, specifically includes that the steel girder is pressed the district, the steel girder is drawn district and cantilever flange, all is provided with profiled sheet 4 in a plurality of regions, reinforced concrete decking 7 and constitutes the steel girder that the section is the I shape by upper flange 1, bottom flange 2, web, and profiled sheet 4 supports through supporting mechanism, because the difference of atress, when profiled sheet 4 is laid in different regions, need adopt different supporting mechanism, specifically:
example one
As shown in fig. 1 and 2, the profiled steel sheet laying structure suitable for the non-support construction of the steel-concrete composite beam bridge in the embodiment includes a reinforced concrete bridge deck 7 and a steel main beam formed by an upper flange 1, a lower flange 2 and a web and having an i-shaped section, a support mechanism is arranged on a side surface of the steel main beam, the support mechanism is an angle steel 5 formed by a horizontal toe and a vertical toe and having an L-shaped section, the vertical toe is welded to an upper surface and a lower surface of the upper flange 1 at the same time, two ends of the profiled steel sheet 4 are located on the horizontal toes of the angle steel 5 of two adjacent steel main beams, a highest point of an upper surface of the profiled steel sheet 4 is at the same height as that of the upper flange 1, or the highest point of the upper surface of the profiled steel sheet 4 is lower than that of the upper flange 1, and the reinforced concrete bridge deck 7 is arranged on the upper surface of the profiled steel sheet 4.
This embodiment is applicable to the steel girder pressure zone, and top flange 1 bears compressive stress under the dead load, and the stress amplitude under the live load is not very showing to fatigue effect, consequently, angle steel 5 direct welding can satisfy the requirement on top flange 1's upper surface and lower surface. Two welding seams 3 are provided, one welding seam is positioned on the upper surface of the upper flange 1, the other welding seam is positioned on the lower surface of the upper flange 1, the welding seam 3 is a fillet welding seam, and the size of a welding leg of the welding seam 3 is 4-6 mm so as to ensure the strength of welding connection.
The profiled steel sheet 4 is an open profiled steel sheet, and plug plates are firstly welded at two ends of the profiled steel sheet 4 before laying so as to prevent mortar from losing from two ends of the profiled steel sheet 4 when concrete is poured. The length of the part of the profiled steel sheet 4 on the horizontal toe is greater than or equal to 50mm, so that a sufficient supporting length between the horizontal toe and the profiled steel sheet 4 is ensured, and the stability and the bearing capacity of the profiled steel sheet 4 are improved.
The construction process of the embodiment is as follows: firstly, welding angle steels 5 on two sides of an upper flange 1 of a steel girder, wherein the transverse toes of the angle steels 5 are positioned at the bottoms of the vertical toes, adopting double-sided angle welding seams, namely the vertical toes are simultaneously welded with the upper surface and the lower surface of the upper flange 1, so that the toe damage caused by the torsion of the single-sided welding seams can be reduced, then welding plug plates at two ends of a profiled steel plate 4, plugging notches on the upper surface of the profiled steel plate 4, then laying the profiled steel plate 4 on the transverse toes of two adjacent steel girders, then binding reinforcing steel bars, and finally pouring concrete to obtain a reinforced concrete bridge deck 7.
Example two
As shown in fig. 3 and 4, the profiled steel sheet laying structure suitable for the non-support construction of the steel-concrete composite beam bridge of the embodiment includes a reinforced concrete bridge deck 7 and a steel main beam with an i-shaped section formed by an upper flange 1, a lower flange 2 and a web, the side surface of the steel main beam is provided with a supporting mechanism which comprises a J-shaped hook plate 6 and T-shaped angle steel 8, the top of the J-shaped hook plate 6 is provided with a horizontal connecting plate 9, two side edges of the connecting plate 9 are welded with the lower surface of the upper flange 1, the lower part of the vertical angle toe of the T-shaped angle steel 8 is inserted into the J-shaped hook plate 6, the upper end of the vertical angle toe of the T-shaped angle steel 8 extends to the upper part of the upper flange 1, the upper surface of the upper flange 1 is provided with a pull rod 10, the pull rod 10 can adopt a steel belt and the like, and two ends of the pull rod 10 are welded with the vertical angle toes of the T-shaped angle iron 8 on two sides of the upper flange 1. The end part of the profiled steel sheet 4 is positioned on the horizontal angle toe of the T-shaped angle steel 8, the highest point of the upper surface of the profiled steel sheet 4 is at the same height with the upper surface of the upper flange 1, or the highest point of the upper surface of the profiled steel sheet 4 is lower than the upper surface of the upper flange 1, and the reinforced concrete bridge deck 7 is arranged on the upper surface of the profiled steel sheet 4.
The connecting plate 9 and the J-shaped hook plate 6 are integrally formed, the hook depth of the J-shaped hook plate 6 is larger than or equal to 30mm, the welding line 3 between the two side edges of the connecting plate 9 and the upper flange 1 is an angle welding line, the distance from the welding line 3 to the nearest edge of the upper flange 1 is larger than or equal to 15mm, and the length of the profiled steel plate 4 on the horizontal angle toe of the T-shaped angle steel 8 is not smaller than 50mm, so that the strength and the supporting capacity of the whole steel structure are guaranteed, and the risk of fatigue cracking is reduced.
The embodiment is suitable for a tension area of the steel main beam, namely a hogging moment area of the continuous beam, the upper flange 1 bears tensile stress under constant load, the stress amplitude under live load has obvious influence on fatigue effect, and the support mechanism is connected with the steel main beam by adopting multi-point connection, so that the stress at the welding position is reduced. Specifically, the profiled steel sheet 4 is supported by the horizontal toe of the T-shaped angle steel 8, the gravity of the profiled steel sheet 4 and the reinforced concrete deck plate 7 and the load when the vehicle passes through are transmitted to the vertical toe of the T-shaped angle steel 8, the vertical toe of the T-shaped angle steel 8 transmits part of the load to the tie rod 10, the tie rod 10 receives the part of the load, and the vertical toe of the T-shaped angle steel 8 transmits the other part of the load to the J-shaped hook plate 6. The load is dispersed, and the load born by the J-shaped hook plate 6 is small, so that the stress at the welding position of the connecting plate 9 and the upper flange 1 is reduced, and the fatigue cracking of the upper flange 1 at the welding position is prevented.
The construction process of the embodiment is as follows: firstly, welding J-shaped hook plates 6 on two sides of a steel main beam, welding connecting plates 9 of the J-shaped hook plates 6 with the lower surfaces of upper flanges 1, enabling 2 welding seams 3 to be 2, enabling the size of a welding leg to be 4-6 mm, inserting vertical angle toes of T-shaped angle steel 8 into the J-shaped hook plates 6, ensuring that the bottoms of the vertical angle toes of the T-shaped angle steel 8 are in contact with the bottoms of the J-shaped hook plates 6, placing pull rods 10 on the upper surfaces of the upper flanges 1, and welding the pull rods 10 on the T-shaped angle steel 8 on two sides of the upper flanges 1. The profiled steel plates 4 are open profiled steel plates, plugging plates are welded at two ends of the profiled steel plates 4, notches on the upper surfaces of the profiled steel plates 4 are plugged, the profiled steel plates 4 are laid on horizontal angle toes of T-shaped angle steels 8 of two adjacent steel main beams, the length of the profiled steel plates 4 on the horizontal angle toes of the T-shaped angle steels 8 is not less than 50mm, and finally reinforcing steel bars can be bound and concrete can be poured to obtain the reinforced concrete bridge deck 7.
EXAMPLE III
As shown in fig. 5 and 6, the profiled steel sheet laying structure suitable for the steel-concrete composite beam bridge non-support construction of the embodiment includes a reinforced concrete bridge deck 7 and a steel main beam having an i-shaped cross section and formed by an upper flange 1, a lower flange 2 and a web, a supporting mechanism is disposed on a side surface of the steel main beam, the supporting mechanism includes a plurality of cantilever beams 11 having an i-shaped cross section, a top plate of each cantilever beam 11 is welded to the upper flange 1, a middle vertical plate and a bottom plate of each cantilever beam 11 are welded to the web of the steel main beam, an exterior hanging plate 12 having an L-shaped cross section is disposed on an upper surface of one end of each cantilever beam 11 away from the steel main beam, two ends of each profiled steel sheet 4 are located on two adjacent cantilever beams 11, a side edge of each profiled steel sheet 4 away from the steel main beam is located on the exterior hanging plate 12, and the highest point of the upper surface of each profiled steel sheet 4 is at the same height as the upper surface of the upper flange 1, or the highest point of the upper surface of the profiled steel plate 4 is lower than the upper surface of the upper flange 1, and the reinforced concrete bridge deck 7 is arranged on the upper surface of the profiled steel plate 4.
This embodiment is applicable to the cantilever flange, in order to guarantee the stable support to profiled sheet 4 and reinforced concrete decking 7, at the side welding cantilever beam 11 of steel girder, because cantilever beam 11's roof and 1 welded connection of last flange, cantilever beam 11's middle riser and bottom plate and the web welded connection of steel girder, 3 total welding seams 3 for stress dispersion can prevent that fatigue cracking phenomenon from appearing in the splice. And through set up cladding 12 in cantilever beam 11 one end of keeping away from the steel girder, can fix a position profiled sheet 4, prevent that profiled sheet 4 from laying the back and sliding.
Profiled steel sheet 4 adopts closed type profiled steel sheet, the side that profiled steel sheet 4 is close to the steel girder is provided with end plate 13, and end plate 13 accessible is straightened profiled steel sheet 4 the part that is close to top flange 1 and obtains, the laminating of 1 side in top flange of end plate 13 and steel girder, and be provided with a plurality of oval through-holes 14 at length direction upper uniform distribution on end plate 13, the diameter of through-hole 14 is 50x30mm, and the distance between two adjacent through-holes 14 is about 100mm, and is the same with the horizontal reinforcing bar interval of decking, during the ligature reinforcing bar, the tip of the horizontal atress reinforcing bar of bottom of decking runs through-hole 14.
In order to improve the stability of the profiled steel sheet 4, a plurality of rows of shear nails 15 are arranged on the cantilever beam 11, and the upper ends of the shear nails 15 penetrate through the profiled steel sheet 4 and are anchored inside the reinforced concrete deck slab 7 as connecting pieces. Specifically, the shear nails 15 may be 3 rows, and are welded to the profiled steel sheet 4 and the cantilever beam 11, so as to connect the cantilever beam 11, the profiled steel sheet 4 and the reinforced concrete bridge deck 7 into a whole.
The construction process of the embodiment is as follows: with the welding of cantilever beam 11 in the side of steel girder, the roof and the 1 welded connection in last flange of cantilever beam 11, the web welded connection of middle riser and the bottom plate of cantilever beam 11 and steel girder, the welding seam is the fillet weld, the leg size is 4 ~ 6mm, then the last surface welding cladding panel 12 of the one end of keeping away from the steel girder at cantilever beam 11, 4 side cold-bending of high-pressure profiled sheet is straightened again and is formed end plate 13, and open through-hole 14 on end plate 13, lay profiled sheet 4 after that, the both ends of profiled sheet 4 are located adjacent two cantilever beams 11, and the side of end plate 13 laminating top flange 1, one side that profiled sheet 4 kept away from top flange 1 is located cladding panel 12. After the profiled steel sheet 4 is laid, the shear nails 15 are welded, and the profiled steel sheet 4 is welded through, so that the shear nails 15 penetrate through the profiled steel sheet 4 and are connected with the cantilever beam 11 in a welding mode. And finally binding the steel bars, enabling the end parts of the bottom layer transverse stress steel bars to penetrate through the through holes 14, and pouring concrete.
In conclusion, the support-free construction method of the bridge deck of the steel-concrete composite beam bridge is an objective requirement of industrialized bridge construction. The invention provides a profiled steel sheet laying structure for the support-free construction of a reinforced concrete composite bridge and a bridge deck support-free construction, which comprises three types, namely a profiled steel sheet laying structure of a steel girder compression area, a profiled steel sheet laying structure of a steel girder tension area and a profiled steel sheet laying structure of a cantilever flange, covers all working conditions of the profiled steel sheet 4 laying in the support-free construction, reasonably designs a supporting mechanism according to the stress condition of each area, has higher strength in the area with larger load and influencing the connection strength, has simple structure in the supporting mechanism adopted in the area with smaller load, ensures the construction convenience, and simultaneously enables the service lives of the supporting mechanism and the profiled steel sheet 4 in each area to be balanced. The method combines the structural requirements of fatigue stress of the steel girder, meets the stress requirement under construction load, is simple and convenient to construct, has high safety, and saves the construction period.
For a steel-concrete composite beam bridge with the pier height within 15m, the cost for cast-in-place of a concrete bridge deck slab support is about 230 yuan per square meter, the cost for adopting a 6mm steel bottom plate as a template of a bottom die is about 420 yuan per square meter, and the cost for adopting a 1.2mm galvanized profiled steel sheet as a bottom die for construction without a support is about 55 yuan per square meter. Compared with the cost, the construction scheme of the profiled steel sheet non-support bridge deck slab has obvious cost advantage.
Meanwhile, the bridge deck construction method by using the support has the defects of long construction period, unsuitability for pouring of the bridge deck of the high-pier bridge in the mountainous area, high risk and the like. The bottom die construction method of the steel bottom plate can process the bottom die in a factory, but has the highest cost and is uneconomical. The construction method adopting the profiled steel sheet 4 as the bottom die has the advantages that the construction cost is low, and the difficult problem of concrete pouring at the cantilever end of the combined bridge deck is solved; moreover, the galvanized profiled steel sheet 4 has an advantage that the durability and the appearance are not comparable to each other. The zinc plating treatment can prevent rust and corrosion; the profiled steel sheet 4 isolates the contact of air and water with the concrete bridge deck, and prolongs the durability and the service life of the concrete bridge deck; meanwhile, the appearance is smooth and beautiful.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. Profiled steel sheet lays structure suitable for steel-concrete composite beam bridge does not have support construction, including steel girder compression district lay the structure, the structure is laid to the steel girder tension district and the structure is laid to the cantilever edge of a wing, the structure is laid to steel girder compression district, the structure is laid to the steel girder tension district and the structure is laid to the cantilever edge of a wing all includes reinforced concrete decking (7) and constitutes the steel girder that the section is the I shape by top flange (1), bottom flange (2), web, its characterized in that:
the steel girder bridge deck slab comprises a steel girder compression zone laying structure, supporting mechanisms, at least two welding seams (3) and a compression steel plate (4), wherein the two side faces of the steel girder compression zone laying structure, the two side faces of the steel girder tension zone laying structure and the cantilever side of the steel girder of the cantilever flange laying structure are respectively provided with the supporting mechanism, the supporting mechanisms are connected with the steel girder through the at least two welding seams (3), the supporting mechanisms are provided with the compression steel plate (4), the highest point of the upper surface of the compression steel plate (4) and the upper surface of the upper flange (1) are at the same height, or the highest point of the upper surface of the compression steel plate (4) is lower than the upper surface of the upper flange (1), and the reinforced concrete bridge deck slab (7) is arranged on the upper surface of the compression steel plate (4).
2. A profiled steel sheet laying structure suitable for the stentless construction of the steel-concrete composite beam bridge as claimed in claim 1, wherein: the supporting mechanism of the steel girder compression area laying structure is angle steel (5) with an L-shaped section formed by a horizontal toe and an upright toe, the upright toe is simultaneously connected with the upper surface and the lower surface of the upper flange (1) in a welding manner, and two ends of the profiled steel sheet (4) are positioned on the horizontal toes of the angle steel (5) of the two adjacent steel girders.
3. A profiled steel sheet laying structure suitable for the stentless construction of the steel-concrete composite beam bridge as claimed in claim 2, wherein: the leg size of the weld seam (3) is 4 to 6 mm.
4. A profiled steel sheet laying structure suitable for the stentless construction of the steel-concrete composite beam bridge as claimed in claim 2, wherein: the length of the part of the profiled steel sheet (4) on the horizontal toe is greater than or equal to 50 mm.
5. A profiled steel sheet laying structure suitable for the stentless construction of the steel-concrete composite beam bridge as claimed in claim 1, wherein: the supporting mechanism of the steel girder tension area laying structure comprises a J-shaped hook plate (6) and T-shaped angle steel (8), a horizontal connecting plate (9) is arranged at the top of the J-shaped hook plate (6), two side edges of the connecting plate (9) are welded with the lower surface of an upper flange (1), the lower portion of the vertical angle toe of the T-shaped angle steel (8) is inserted into the J-shaped hook plate (6), the upper end of the vertical angle toe of the T-shaped angle steel (8) extends to the upper side of the upper flange (1), a pull rod (10) is arranged on the upper surface of the upper flange (1), the two ends of the pull rod (10) are welded with the vertical angle toes of the T-shaped angle steel (8) on the two sides of the upper flange (1), and the end portion of a profiled steel plate (4) is located on the horizontal angle toe of the T-shaped angle steel (8).
6. A profiled steel sheet laying structure suitable for the stentless construction of the steel-concrete composite beam bridge as claimed in claim 5, wherein: the distance from the welding seam (3) between the connecting plate (9) and the upper flange (1) to the edge of the upper flange (1) is larger than or equal to 15 mm.
7. A profiled steel sheet laying structure suitable for the stentless construction of the steel-concrete composite beam bridge as claimed in claim 5, wherein: the hook depth of the J-shaped hook plate (6) is greater than or equal to 30 mm.
8. A profiled steel sheet laying structure suitable for the stentless construction of the steel-concrete composite beam bridge as claimed in claim 1, wherein: cantilever flange laying structure's supporting mechanism includes that many sections are cantilever beam (11) of I shape, the roof and top flange (1) welded connection of cantilever beam (11), the middle riser and the bottom plate of cantilever beam (11) and the web welded connection of steel girder, the upper surface of the one end that the steel girder was kept away from in cantilever beam (11) is provided with link plate (12) that the section is L shape, the both ends of profiled sheet (4) are located adjacent two cantilever beam (11), and the side that the steel girder was kept away from in profiled sheet (4) is located link plate (12).
9. A profiled steel sheet laying structure suitable for the stentless construction of the steel-concrete composite beam bridge as claimed in claim 8, wherein: the profiled steel sheet (4) are provided with end plate (13) near the side of steel girder, end plate (13) and the laminating of top flange (1) side of steel girder, and are provided with a plurality of through-holes (14) evenly distributed on length direction on end plate (13).
10. A profiled steel sheet laying structure suitable for the stentless construction of the steel-concrete composite beam bridge as claimed in claim 8, wherein: and a plurality of rows of shear nails (15) are arranged on the cantilever beam (11), and the upper ends of the shear nails (15) penetrate through the profiled steel sheet (4) and are poured and embedded in the reinforced concrete bridge deck (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110806642.0A CN113445429A (en) | 2021-07-16 | 2021-07-16 | Profiled steel sheet laying structure suitable for support-free construction of steel-concrete composite beam bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110806642.0A CN113445429A (en) | 2021-07-16 | 2021-07-16 | Profiled steel sheet laying structure suitable for support-free construction of steel-concrete composite beam bridge |
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| Publication Number | Publication Date |
|---|---|
| CN113445429A true CN113445429A (en) | 2021-09-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110806642.0A Pending CN113445429A (en) | 2021-07-16 | 2021-07-16 | Profiled steel sheet laying structure suitable for support-free construction of steel-concrete composite beam bridge |
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| CN (1) | CN113445429A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114541258A (en) * | 2022-03-14 | 2022-05-27 | 甘肃省交通规划勘察设计院股份有限公司 | Assembly type steel-concrete composite beam template-free construction bridge deck |
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2021
- 2021-07-16 CN CN202110806642.0A patent/CN113445429A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114541258A (en) * | 2022-03-14 | 2022-05-27 | 甘肃省交通规划勘察设计院股份有限公司 | Assembly type steel-concrete composite beam template-free construction bridge deck |
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