CN218813186U - Cast-in-situ connecting structure of steel-concrete composite beam - Google Patents
Cast-in-situ connecting structure of steel-concrete composite beam Download PDFInfo
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- CN218813186U CN218813186U CN202221612787.3U CN202221612787U CN218813186U CN 218813186 U CN218813186 U CN 218813186U CN 202221612787 U CN202221612787 U CN 202221612787U CN 218813186 U CN218813186 U CN 218813186U
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Abstract
The utility model discloses a cast-in-place connection structure of steel-concrete composite beam, including girder steel and prefabricated concrete bridge road plate, the girder steel top is equipped with pours the groove, and prefabricated concrete bridge road plate bottom is through cast-in-place in the pouring material and girder steel fixed connection of pouring the inslot, the utility model discloses utilize and pour the groove and form pouring space and combine prefabricated concrete bridge road plate and girder steel formation through pouring the material, set up special pouring space, can make the pouring material of pouring after can guaranteeing to pour the quality of pouring owing to get rid of complicated shear force key and shear reinforcement's influence, the regional shear force key structure of combination among the composite construction is by pouring groove itself and forming, can obviously simplify construction technology, shorten construction cycle to can guarantee holistic composite beam intensity, thereby guarantee the construction convenience of bridge, safe in utilization, the maintenance is simple and easy and has apparent technique, economy and social comprehensive benefit.
Description
Technical Field
The utility model belongs to building structure and bridge engineering field, in particular to cast-in-situ connection structure of steel-concrete composite beam.
Background
The steel-concrete combined structure fully utilizes the characteristics of concrete and steel structure materials, combines the advantages of tensile strength and compressive strength, and has more and more application reasons on bridges; because the characteristics of the steel structure and the concrete material are different, how to simply, conveniently and quickly connect the steel structure and the concrete material and ensure the long-term reliable performance of the steel structure and the concrete material is a problem which is always explored and solved in the engineering industry.
In the prior art, two structures are generally adopted, one structure is that a bridge deck is assembled on a steel beam through a preset component to form a composite structure, the structural method does not need the workload of drilling on site, but needs some reserved holes, seams and the like to cast in situ on site, the long-term performance is difficult to guarantee, and the combination degree of the assembly mode is not satisfactory; the other method is that shear keys are arranged on the joint surface of the steel beam along the longitudinal direction, the bridge deck is provided with shear steel bars, and a steel-concrete combined bridge structure is formed by the cast-in-place concrete bridge deck, so that the structure has better combination performance, but the structures of the shear keys and the steel bars of the concrete in the cast-in-place joint area are complex, and the compactness of the regional concrete is difficult to ensure; the micro defects gradually develop into macro cracks under the action of long-term impact and fatigue load, so that the force transmission performance of the micro cracks is gradually degraded, and the bridge has potential safety hazards of difficult inspection and maintenance.
Therefore, a connection structure of a steel concrete composite bridge formed by a precast concrete plate and a steel structure is needed, the structure of a shear key in a connection area is simple, the quality of cast-in-place concrete in the later period is not influenced, the construction process can be obviously simplified, the construction period is shortened, and the strength of the whole composite bridge can be ensured; therefore, the bridge is convenient to construct, safe to use and easy to maintain, and has remarkable technical, economic and social comprehensive benefits.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a cast-in-situ connection structure for a steel-concrete composite beam, which has a simple structure of a combined area shear key, does not affect the quality of the cast-in-situ concrete in the later period, can obviously simplify the construction process, shorten the construction period, and can ensure the strength of the whole composite beam; therefore, the construction of the bridge is convenient, the use is safe, the maintenance is simple and easy, and the comprehensive benefits of technology, economy and society are remarkable.
The utility model discloses a cast-in-place joint construction of steel-concrete composite beam, the groove of pouring that is equipped with including the girder steel top, it is used for cast in situ concrete and through cast in situ pouring material and prefabricated concrete bridge plate bottom fixed connection to pour the groove.
Further, the cross section of the pouring groove is a trapezoidal trapezoid groove.
And the shear key is positioned at the bottom of the precast concrete bridge deck and extends downwards into the pouring groove.
Further, the shear key is formed by shear steel bars poured in the precast concrete bridge deck.
Furthermore, the transverse shape of the shear key is a trapezoidal shear key formed by bending shear steel bars.
Further, the top edge of the trapezoidal shear key is poured on the precast concrete bridge deck, and the bottom edge of the trapezoidal shear key is poured on the pouring groove;
and at least one pouring hole for cast-in-place is reserved on the prefabricated bridge road plate.
Further, the bottom edge of the trapezoidal shear key is larger than an upper opening of the pouring groove, and the precast concrete bridge deck is precast in longitudinal sections; before pouring, the trapezoidal shear key is embedded into the pouring groove from the end part of the pouring groove, the prefabricated concrete bridge deck is pushed along the longitudinal direction to be in place at the top of the steel beam, and then pouring is carried out.
Further, the casting material is special concrete.
Furthermore, the steel beam is an I-shaped steel beam, the pouring groove is formed by two steel plates welded on a top plate of the I-shaped steel beam, and an antifriction layer convenient for the prefabricated concrete bridge road slab to push is formed at the top end of each steel plate.
The utility model has the advantages that: the utility model discloses a cast-in-place joint construction of steel-concrete composite beam, utilize pouring groove to form the pouring space and form the combination with prefabricated concrete bridge curb plate and girder steel through the pouring material, set up special pouring space, can make the pouring material of pouring after guaranteeing to pour the quality owing to get rid of complicated shear force key and shear force reinforcing bar's influence, the combination area shear force key structure in the composite construction is by pouring groove itself formation, can obviously simplify construction process, shorten construction cycle, and can guarantee holistic composite beam intensity, thereby guarantee that the construction of bridge is convenient, safety in utilization, the maintenance is simple and easy and has apparent technique, economy and social combined benefits.
Drawings
The invention is further described with reference to the following figures and examples.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1;
fig. 3 is an enlarged view of fig. 2 at a.
Detailed Description
As shown in the figures, the cast-in-place connection structure of the steel-concrete composite beam is adopted in the embodiment, and includes a casting groove 201 arranged at the top of a steel beam 2, wherein the casting groove 201 is used for casting concrete in place and is fixedly connected with the bottom of a precast concrete bridge deck 1 through cast-in-place casting material; as shown in the figure, the pouring groove is formed by two steel plates which are fixedly arranged (generally welded) along the longitudinal direction on the top surface of the steel beam, the precast concrete bridge deck is supported at the top of the pouring groove and covers the opening of the pouring groove, and the steel beam is fixedly combined with the precast concrete bridge deck after pouring the castable inside; in the structure, the two side plates and the precast concrete bridge road plate are directly poured and fixed, the shearing action is directly played, the formed pouring groove has no complex shearing force key interference in the pouring process, and the pouring is favorable for ensuring the compactness of the pouring material, so that the pouring quality is ensured, and the connection strength is finally ensured.
In this embodiment, the cross section of the casting groove 201 is a trapezoidal trapezoid groove, and the trapezoidal groove forms a trapezoidal casting body after casting the casting material, so that the casting material has a better anti-pulling effect while shearing, and the bonding strength of the composite structure is further ensured.
In the embodiment, the concrete bridge slab further comprises shear keys 3, wherein the shear keys 3 are positioned at the bottom of the precast concrete bridge deck 1 and extend downwards into the pouring groove, and as shown in the figure, a plurality of shear keys are distributed along the longitudinal direction; the shear key 3 extends downwards into the pouring groove 201, so that the shear resistance effect is further enhanced, although the shear key is provided, the shear key still occupies a smaller space compared with a shear structure with shear resistance at the upper part and the lower part in the prior art, and the pouring of pouring materials cannot be greatly interfered; the shear key 3 can adopt a structure that the steel bars directly extend out, and can also be a pre-embedded shear nail and the like, which is not described in detail herein.
In this embodiment, the shear key 3 is formed by the shear steel bars poured into the precast concrete bridge deck and is directly formed by the steel bars in the precast concrete bridge deck 1, and no additional shear structure is required to be arranged, so that the manufacturing process of the precast concrete bridge deck is simplified.
In the embodiment, the transverse shape of the shear key 3 is a trapezoidal shear key formed by bending a shear steel bar, the trapezoidal shear key is matched with the trapezoidal pouring groove to form a trapezoidal pouring body after pouring, and a better anti-pulling effect is realized by using a wedge-shaped structure formed between the trapezoidal shear key and the trapezoidal pouring groove; simultaneously, trapezoidal shear force key makes the space of pouring in the groove comparatively unblocked, closely knit degree when guaranteeing the pouring material and pouring, guarantees joint strength.
In this embodiment, the top edge of the trapezoidal shear key is poured on the precast concrete bridge deck 1, and the bottom edge is poured on the pouring groove 201, so as to form a good connection structure with high strength.
In this embodiment, the bottom edge of the trapezoidal shear key is larger than the upper opening of the pouring groove 201, and the precast concrete bridge deck 1 is precast in longitudinal sections; before pouring, embedding the trapezoidal shear key into the pouring groove from the end part of the pouring groove 201, pushing the prefabricated concrete bridge road plate along the longitudinal direction to be in place at the top of the steel beam, and pouring; in the structure, because the bottom edge of the trapezoidal shear key is larger than the upper opening of the pouring groove, the prefabricated concrete bridge and road plate cannot be in place from the upper part and only enters from the end part in a pushing manner, and the length of the prefabricated concrete bridge and road plate is not too long so as to avoid increasing the construction difficulty; the bottom edge of the trapezoidal shear key is larger than the upper opening of the pouring groove, so that the connection strength of the trapezoidal shear key and the pouring groove is further improved; certainly, the bottom edge of the trapezoidal shear key can also be smaller than the upper opening of the pouring groove, the trapezoidal shear key can be lifted from the upper part and can be placed in place, and the poured body of the poured wedge-shaped structure still has good connection strength, but the strength performance is slightly poor compared with the structure.
In this embodiment, the pouring material is special concrete, and special concrete is in the utility model discloses in refer to high strength concrete, mainly rely on high efficiency water reducing agent, or plus a certain amount of active mineral admixture simultaneously, make the concrete that the intensity grade is not less than C60 after hardening, high strength concrete's physical mechanical properties, tensile strength to guarantee the bulk strength of composite construction roof beam, no longer describe herein.
In this embodiment, the steel beam 2 is an i-beam; as shown in the figure, according to the width of the composite beam, a structure of a plurality of transverse parallel I-shaped beams can be adopted; the pouring groove is formed by two steel plates 202 and 203 welded on a top plate of the I-shaped steel beam, an anti-friction layer 4 convenient for the prefabricated concrete bridge deck 1 to push is formed on the top ends of the steel plates 202 and 203, a non-metal material layer with certain bearing capacity, such as a polytetrafluoroethylene layer, is generally adopted for anti-friction, can be bonded and riveted at the top end of each steel plate, reduces friction force in the pushing process, and has a good sealing effect when concrete is cast in place, and the construction is not repeated.
Certainly, in order to guarantee to realize pouring, should reserve at least one on the precast concrete bridge road plate 1 and pour hole 101 and be used for pouring the pouring material, simultaneously, still can be equipped with the bin outlet, and is similar with pouring hole structure for pour the in-process row material, with the closely knit degree of guaranteeing to pour, no longer describe herein.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (7)
1. A cast-in-situ connection structure of a steel-concrete composite beam is characterized in that: the prefabricated concrete bridge slab comprises a pouring groove arranged at the top of a steel beam, wherein the pouring groove is used for casting concrete in situ and is fixedly connected with the bottom of a prefabricated concrete bridge slab through a cast-in-situ casting material;
the cross section of the pouring groove is a trapezoidal groove;
the prefabricated concrete bridge deck slab further comprises a shear key, wherein the shear key is positioned at the bottom of the prefabricated concrete bridge deck slab and extends downwards into the pouring groove.
2. The cast-in-place connection structure of the steel-concrete composite beam as claimed in claim 1, wherein: the shear key is formed by shear steel bars poured in the precast concrete bridge deck.
3. The cast-in-place connection structure of the steel-concrete composite beam as claimed in claim 2, wherein: the transverse shape of the shear key is a trapezoidal shear key formed by bending shear steel bars.
4. The cast-in-place connection structure of the steel-concrete composite beam as claimed in claim 3, wherein: the top edge of the trapezoid shear key is poured in the precast concrete bridge deck, and the bottom edge of the trapezoid shear key is poured in the pouring groove;
and at least one pouring hole for cast-in-place is reserved on the precast concrete bridge road plate.
5. The cast-in-place connection structure of the steel-concrete composite beam as claimed in claim 4, wherein: the bottom edge of the trapezoid shear key is larger than the upper opening of the pouring groove, and the precast concrete bridge deck is precast in longitudinal sections; before pouring, the trapezoid shear key is embedded into the pouring groove from the end part of the pouring groove, and the prefabricated concrete bridge deck is longitudinally pushed to be in place at the top of the steel beam and then poured.
6. The cast-in-place connection structure of a steel-concrete composite girder according to claim 2, wherein: the castable is special concrete.
7. The cast-in-place connection structure of the steel-concrete composite beam as claimed in claim 2, wherein: the steel beam is an I-shaped steel beam, the pouring groove is formed by two steel plates welded on a top plate of the I-shaped steel beam, and an antifriction layer convenient for pushing the precast concrete bridge deck is formed at the top end of each steel plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221612787.3U CN218813186U (en) | 2022-06-24 | 2022-06-24 | Cast-in-situ connecting structure of steel-concrete composite beam |
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| CN202221612787.3U CN218813186U (en) | 2022-06-24 | 2022-06-24 | Cast-in-situ connecting structure of steel-concrete composite beam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115094745A (en) * | 2022-06-24 | 2022-09-23 | 中冶建工集团有限公司 | Cast-in-situ integral steel-concrete composite beam |
| CN115094745B (en) * | 2022-06-24 | 2024-10-29 | 中冶建工集团有限公司 | Cast-in-situ integral steel-concrete composite beam |
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- 2022-06-24 CN CN202221612787.3U patent/CN218813186U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115094745A (en) * | 2022-06-24 | 2022-09-23 | 中冶建工集团有限公司 | Cast-in-situ integral steel-concrete composite beam |
| CN115094745B (en) * | 2022-06-24 | 2024-10-29 | 中冶建工集团有限公司 | Cast-in-situ integral steel-concrete composite beam |
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