CN211645913U - Prefabricated prestressed steel and concrete spliced continuous combination beam - Google Patents

Abstract

A prefabricated prestressed steel and concrete splicing continuous composite beam comprises prefabricated concrete slabs, prestressed I-beams, prestressed steel bars, shear force connectors, steel box girder connection members and concrete slab connection members. The construction method is: when docking, first connect the prestressed I-beam beams through the steel beam connecting members, and connect the web connecting steel plates, the upper flange connecting steel plates and the lower flange connecting steel plates to the steel beams through bolts; The concrete slab connecting member connects the precast concrete slabs; the concrete slab connecting member includes four structural forms, the first structural form uses the finishing bolts as the connecting parts, and the bolts are installed in the form of reserved holes; the second and third structural forms use the anchor cable It is a connecting piece, the difference is that one directly installs the anchor cable in the form of a reserved hole, the other is completed and then pours concrete, and then installs the anchor cable through the reserved hole form; the fourth structural form uses the embedded steel bar as the connecting piece, using Post-cast concrete form to seal the reinforcement.

Description

A prefabricated prestressed steel and concrete splicing continuous composite beam

technical field

The utility model belongs to the technical field of bridge engineering, in particular to a continuous composite beam spliced with prefabricated prestressed steel and concrete.

Background technique

The steel and concrete composite beam is a composite beam that connects the steel beam and the concrete slab through the shear connector to coordinate the stress and deformation. It can make full use of the superior tensile properties of steel and the superior compression resistance of concrete. performance.

The prestressed steel and concrete continuous composite beam refers to the arrangement of prestressed steel bars near the lower flange of the steel beam under positive bending moment, and the application of prestressing; , In the concrete flange plate or at the same time near the upper flange of the steel beam and in the concrete plate at the same time arranging prestressed steel bars, and applying prestressing; the purpose of applying prestressing to the tension steel flange is to expand its elastic performance range and improve its fatigue strength. Reduce the amount of steel and improve the bearing capacity and stiffness of composite beams. The purpose of applying prestress to the concrete slab in the negative bending moment area of the composite beam is to delay the appearance of concrete cracks in the negative bending moment area, prevent the development of cracks in the concrete slab, reduce the corrosion of steel bars in the concrete slab and the deterioration of concrete, increase the durability, and improve the negative bending moment. Bending capacity in the bending moment zone.

In practical projects, prestressed steel and concrete construction is usually carried out on the construction site. In order to improve the construction speed and not affect the surrounding construction environment, prestressed steel and concrete composite beams can be made in different places or outside the construction site, or firstly in different places. Steel and concrete composite beams are made, and then prestressed on site to form prefabricated prestressed steel and concrete composite beams. Prefabricated prestressed steel and concrete composite beams have many advantages, mainly reflected in rapid construction, reduced impact on surrounding traffic flow due to construction activities, good seismic performance and sufficient durability.

However, prefabricated prestressed steel and concrete composite beams also have obvious disadvantages, that is, the length of prefabricated prestressed steel and concrete composite beams will be limited due to factors such as site conditions, construction environment, transportation and hoisting. However, the length of prestressed steel and concrete composite beams cannot meet the needs of practical engineering.

Utility model content

Aiming at the problems existing in the prior art, the utility model provides a continuous composite beam spliced with prefabricated prestressed steel and concrete, which can effectively extend the overall length of the composite beam, thereby effectively meeting the length requirements of the composite beam in practical engineering.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a prefabricated prestressed steel and concrete splicing continuous composite beam, including prefabricated concrete slab, prestressed I-beam, prestressed steel bar, shear force connector, steel beam connection Component and concrete slab connection component; the precast concrete slab is fixed on the top of the upper flange of the prestressed I-beam, the shear force connector is pre-buried inside the prefabricated concrete slab, and the shear force connector is welded and fixed on the prestressed work piece. The top of the upper flange of the beam; the prestressed steel bars are arranged under the upper flange of the prestressed I-beam, above the lower flange or below the lower flange; the prestressed I-beam is fixedly connected by a steel beam connecting member when docking ; The prefabricated concrete slabs are fixedly connected through the concrete slab connecting members when they are butted.

The steel beam connecting member includes a web connecting steel plate, an upper flange connecting steel plate and a lower flange connecting steel plate; the web connecting steel plate is overlapped between the webs of the two butted prestressed I-beam beams, and the web The connecting steel plate and the web of the prestressed I-beam are fixedly connected by web connecting bolts; the upper flange connecting steel plate is overlapped between the upper flanges of the two butted prestressed I-beams, and the upper flanges are connected. The steel plate and the upper flange of the prestressed I-beam are fixedly connected by the upper flange connecting bolt, and the upper end of the upper flange connecting bolt is pre-buried in the precast concrete slab; the lower flange connecting steel plate is lapped on the two butted prestressed Between the lower flanges of the I-beam, the lower flange connecting steel plate and the lower flange of the prestressed I-beam are fixedly connected through the lower flange connecting bolts.

The concrete slab connecting member includes four structural forms; the concrete slab connecting member of the first structural form includes finishing bolts and reserved holes for the bolts, and the reserved holes for the bolts are arranged in the precast concrete slab through a pre-embedded mold or a corrugated pipe, The precast concrete slab at the rear end of the reserved hole channel for the bolt is provided with a reserved concrete post pouring groove, the finishing bolts are inserted into the reserved hole channel of the bolts of the two butt jointed precast concrete slabs, and the two butt jointed prefabricated concrete slabs pass through Finished-rolled bolts are used for fixed connection; the second structural form of concrete slab connection components includes anchor cables and anchor cable reserved channels. The precast concrete slab at the rear end of the reserved channel is provided with a reserved anchoring groove, the anchor cable is inserted into the reserved hole channel of the anchor cable of the two butt-jointed prefabricated concrete slabs, and the two butted prefabricated concrete slabs are fixedly connected by the anchor cable. The third structural form of the concrete slab connecting member includes anchor cables, post-cast concrete and anchor cable reserved channels. The anchor cable reserved channels are set in the precast concrete slab through embedded molds or corrugated pipes, and the anchor cables reserve channels. The precast concrete slab at the rear end is provided with a reserved anchoring groove, and a reserved gap is set between the two butted precast concrete slabs. There are reserved holes for anchor cables, and the anchor cables are inserted into the reserved holes for anchor cables in the two butt-jointed precast concrete slabs and the post-cast concrete. Fixed connection; the concrete slab connection member of the fourth structural form includes pre-embedded steel bars and post-cast concrete. The steel bars extend into the reserved gap, the reserved gap is encapsulated by the post-cast concrete, the pre-embedded steel bars are encapsulated in the post-cast concrete, and the two butt-jointed precast concrete slabs are fixedly connected by the pre-embedded steel bars and the post-cast concrete.

The described construction method of prefabricated prestressed steel and concrete splicing continuous composite beams comprises the following steps:

Step 1: Make the prestressed I-beam according to the design requirements, and process the bolt holes at the design positions of the upper flange, the lower flange and the web of the prestressed I-beam, and at the same time, make the upper flange of the prestressed I-beam. Weld the shear connector on the top;

Step 2: Bind the reinforcement cage in the precast concrete slab, then support the template on the top of the upper flange of the prestressed I-beam, and then place the bound reinforcement cage into the template according to the design requirements, and finally pour concrete into the template. until the concrete is solidified;

Step 3: Connect the fabricated composite beams according to the requirements. After the two butt-jointed prestressed I-beam beams are accurately positioned, respectively install the web connecting steel plate, the upper flange connecting steel plate and the lower flange connecting steel plate to the prestressed steel beams. At the set position on the stressed I-beam, the connection of the prestressed I-beam is completed;

Step 4: After the prestressed I-beams are connected, connect the precast concrete slabs;

In the case of using the first structural form of the concrete slab connection member, before the two precast concrete slabs are formally butted together, it is necessary to insert the finishing bolts into the reserved holes for the bolts on one side. After the two precast concrete slabs are accurately butted, the two ends of the finishing bolts are fixed into the reserved concrete back pouring trough by nuts, and then Concrete is poured into the post-reserved concrete pouring trough to complete the encapsulation; finally, the prestressed steel bars are tensioned and anchored, and the construction is over;

For the case of using the second structural form of the concrete slab connection member, when the two precast concrete slabs are accurately butted, the anchor cable is inserted into the reserved hole for the anchor cable, and the anchor cable is fixed to the prefabricated cable through the anchor. Leave it in the anchoring groove, and then pour concrete into the reserved anchoring groove to complete the packaging; finally stretch the prestressed steel bars and complete the anchoring, and the construction is over;

For the case of using the third structural form of the concrete slab connection member, after the two precast concrete slabs are accurately butted, the anchor cable is inserted into the reserved hole for the anchor cable, and at the same time, the anchor cable is sheathed outside the reserved gap. Install the pre-embedded mold or corrugated pipe, and then pour the post-cast concrete into the reserved gap, so that the reserved gap is filled with the post-cast concrete until the post-cast concrete is solidified and formed; then the anchor cable is fixed to the reserved anchor groove through the anchor. Then pour concrete into the reserved anchoring groove to complete the encapsulation; finally stretch the prestressed steel bars and complete the anchoring, and the construction is over;

For the case of using the fourth structural form of the concrete slab connection member, after the two precast concrete slabs are accurately butted, the pre-embedded steel bars on both sides are butted and bound, and then the post-cast concrete is poured into the reserved gap to make the The reserved gap is filled with post-cast concrete until the post-cast concrete is solidified and formed; finally, the prestressed steel bars are stretched and anchored, and the construction is over.

The beneficial effects of the present utility model:

The prefabricated prestressed steel and concrete spliced continuous composite beam of the utility model can effectively extend the overall length of the composite beam, thereby effectively meeting the length requirement of the composite beam in practical engineering.

Description of drawings

Fig. 1 is the top sectional view of a kind of prefabricated prestressed steel and concrete splicing continuous composite beam (finishing bolt+bolt reserved hole) of the present utility model;

Fig. 2 is the top sectional view of a kind of prefabricated prestressed steel and concrete splicing continuous composite beam (anchor cable+anchor cable reserved channel) of the utility model;

Fig. 3 is the top sectional view of a kind of prefabricated prestressed steel and concrete splicing continuous composite beam (anchor cable+anchor cable reserved tunnel+post-cast concrete) of the utility model;

Fig. 4 is the top sectional view of a kind of prefabricated prestressed steel and concrete splicing continuous composite beam (pre-embedded steel bar + post-cast concrete) of the utility model;

Fig. 5 is the front sectional view of a kind of prefabricated prestressed steel and concrete splicing continuous composite beam (finishing bolt+bolt reserved hole) of the utility model;

Fig. 6 is the partial schematic diagram of the butt joint in Fig. 5;

7 is a front sectional view of a prefabricated prestressed steel and concrete splicing continuous composite beam (anchor cable+anchor cable reserved tunnel) of the utility model;

Fig. 8 is a partial schematic diagram of the butt joint in Fig. 7;

9 is a front sectional view of a prefabricated prestressed steel and concrete splicing continuous composite beam (anchor cable+anchor cable reserved tunnel+post-cast concrete) of the present invention;

Figure 10 is a partial schematic view of the butt joint in Figure 9;

Fig. 11 is the front sectional view of a kind of prefabricated prestressed steel and concrete splicing continuous composite beam (pre-embedded steel bar + post-cast concrete) of the utility model;

Figure 12 is a partial schematic view of the butt joint in Figure 11;

Fig. 13 is A-A sectional view in Fig. 6;

Fig. 14 is B-B sectional view in Fig. 8;

Figure 15 is a C-C sectional view in Figure 10;

Fig. 16 is D-D sectional view in Fig. 12;

Figure 17 is a front cross-sectional view of the single beam before butting in Figure 6;

Figure 18 is a front cross-sectional view of the single beam before butting in Figure 8;

Figure 19 is a front cross-sectional view of the single beam before butting in Figure 10;

Figure 20 is a front cross-sectional view of the single beam before butting in Figure 12;

In the figure, 1—precast concrete slab, 2—prestressed I-beam, 3—prestressed steel bar, 4—shear connection, 5—finishing bolt, 6—web connection steel plate, 7—web connection bolt , 8—upper flange connection steel plate, 9—upper flange connection bolt, 10—lower flange connection steel plate, 11—lower flange connection bolt, 12—reserved concrete post pouring trough, 14—anchor cable, 15—pre Leave the anchoring groove, 16—post-cast concrete, 17—pre-embedded steel bars, 19—reserved holes for bolts, 20—reserved holes for anchor cables.

Detailed ways

The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 20, a prefabricated prestressed steel and concrete spliced continuous composite beam includes a prefabricated concrete slab 1, a prestressed I-beam 2, a prestressed steel bar 3, a shear connector 4, and a steel beam connecting member and the concrete slab connecting member; the precast concrete slab 1 is fixed on the top of the upper flange of the prestressed I-beam 2, the shear force connector 4 is pre-buried inside the prefabricated concrete slab 1, and the shear force connector 4 is welded Fixed on the top of the upper flange of the prestressed I-beam 2; the prestressed steel bars 3 are arranged below the upper flange of the prestressed I-beam 2, above the lower flange or below the lower flange; The steel beams 2 are fixedly connected through steel beam connecting members when they are butted; the precast concrete slabs 1 are fixedly connected through concrete slab connecting members when they are butted.

The steel beam connecting member includes a web connecting steel plate 6, an upper flange connecting steel plate 8 and a lower flange connecting steel plate 10; In between, the web connecting steel plate 6 and the web of the prestressed I-beam 2 are fixedly connected by the web connecting bolts 7; Between the upper flanges of the beam 2, the upper flange connecting steel plate 8 and the upper flange of the prestressed I-beam 2 are fixedly connected by the upper flange connecting bolts 9, and the upper ends of the upper flange connecting bolts 9 are pre-buried in the precast concrete slab. 1; the lower flange connecting steel plate 10 is lapped between the lower flanges of two butted prestressed I-beam beams 2, and the lower flange connecting steel plate 10 and the prestressed I-beam 2 lower flange pass through the lower flange. The flange connecting bolts 11 are fixedly connected.

The concrete slab connecting member includes four structural forms; the concrete slab connecting member of the first structural form includes a finishing bolt 5 and a reserved hole 19 for the bolt, and the reserved hole 19 for the bolt is arranged on the precast concrete through a pre-embedded mold or a corrugated pipe. In the plate 1, the precast concrete plate 1 at the rear end of the bolt reserved hole channel 19 is provided with a reserved concrete back pouring trough 12, and the finishing bolt 5 is inserted into the bolt reserved hole channel 19 of the two butt-jointed prefabricated concrete plates 1. Among them, two butt-jointed precast concrete slabs 1 are fixedly connected by finishing bolts 5; the concrete slab connecting member of the second structural form includes an anchor cable 14 and an anchor cable reserved hole 20, and the anchor cable reserved hole 20 is pre-buried The mold or the corrugated pipe is arranged in the precast concrete slab 1, and the precast concrete slab 1 at the rear end of the reserved hole 20 for the anchor cable is provided with a reserved anchoring groove 15. In the anchor cable reserved channel 20, the two butt-jointed precast concrete slabs 1 are fixedly connected through the anchor cable 14; the concrete slab connecting member of the third structural form includes the anchor cable 14, the post-cast concrete 16 and the anchor cable reserved channel 20. The anchor cable reserved channel 20 is set in the precast concrete slab 1 through a pre-embedded mold or a corrugated pipe, and a reserved anchoring groove 15 is provided on the prefabricated concrete slab 1 at the rear end of the anchor cable reserved channel 20. There is a reserved gap between the concrete slabs 1, and the reserved gap is encapsulated by the post-cast concrete 16. In the post-cast concrete 16, an anchor cable reserved hole 20 is provided through a pre-embedded mold or a corrugated pipe, and the anchor cable 14 passes through. Installed in the anchor cable reserved hole 20 in the two butt-jointed precast concrete slabs 1 and the post-cast concrete 16, the two butt-jointed precast concrete slabs 1 are fixedly connected through the anchor cable 14 and the post-cast concrete 16; the fourth structure The concrete slab connection member of the form includes pre-embedded steel bars 17 and post-cast concrete 16. The pre-embedded steel bars 17 are fixed on the precast concrete slab 1, and a reserved gap is provided between the two butt-jointed precast concrete slabs 1. The embedded steel bars 17 Extend into the reserved gap, the reserved gap is encapsulated by the post-cast concrete 16, the pre-embedded steel bars 17 are encapsulated in the post-cast concrete 16, and the two butted precast concrete slabs 1 are fixed by the pre-embedded steel bars 17 and the post-cast concrete 16. connect.

The described construction method of prefabricated prestressed steel and concrete splicing continuous composite beams comprises the following steps:

Step 1: Make the prestressed I-beam 2 according to the design requirements, and process the bolt holes at the design positions of the upper flange, the lower flange and the web of the prestressed I-beam 2. Weld the shear connector 4 on the top of the upper flange of the beam 2;

Step 2: Bind the reinforcement cage in the precast concrete slab 1, then support the template on the top of the upper flange of the prestressed I-beam 2, and then place the bound reinforcement cage into the template according to the design requirements, and finally pour into the template. Concrete until the concrete hardens into shape;

Step 3: Connect the fabricated composite beams according to the requirements. After the two butt-jointed prestressed I-beams 2 are accurately positioned, connect the web connection steel plate 6, the upper flange connection steel plate 8 and the lower flange connection steel plate respectively. 10 is installed at the set position on the prestressed I-beam 2 to complete the connection of the prestressed I-beam 2;

Step 4: After the prestressed I-beam 2 is connected, the precast concrete slab 1 is connected;

In the case of using the concrete slab connection member of the first structural form, before the two precast concrete slabs 1 are formally butted together, the finishing bolts 5 need to be inserted into the reserved holes 19 for bolts on one side. The butt joint of the precast concrete slabs 1 makes the finishing bolts 5 accurately inserted into the reserved holes 19 for the bolts on the other side; after the two precast concrete slabs 1 are accurately butted, the two ends of the finishing bolts 5 are fixed to the precast concrete slabs 1 by nuts. Leave the concrete back pouring groove 12, and then pour concrete into the reserved concrete back pouring groove 12 to complete the encapsulation; finally stretch the prestressed steel bar 3 and complete the anchoring, and the construction is over;

For the case of using the second structural form of the concrete slab connection member, after the two precast concrete slabs 1 are accurately butted, the anchor cable 14 is inserted into the anchor cable reserved hole 20, and the anchor cable is connected by the anchor tool. 14 is fixed in the reserved anchoring groove 15, and then pours concrete into the reserved anchoring groove 15 to complete the packaging; finally, the prestressed steel bar 3 is stretched and the anchoring is completed, and the construction is over;

For the case of using the third structural form of the concrete slab connection member, after the two precast concrete slabs 1 are accurately butted, the anchor cable 14 is inserted into the anchor cable reserved hole 20, and the anchor cable in the reserved gap The cable 14 is covered with a pre-embedded mold or a corrugated pipe, and then the post-cast concrete 16 is poured into the reserved gap, so that the reserved gap is filled with the post-cast concrete 16 until the post-cast concrete 16 is cured and formed; The cable 14 is fixed in the reserved anchoring groove 15, and then concrete is poured into the reserved anchoring groove 15 to complete the encapsulation; finally, the prestressed steel bar 3 is stretched and the anchoring is completed, and the construction is completed;

For the case of using the fourth structural form of the concrete slab connection member, after the two precast concrete slabs 1 are accurately butted, the pre-embedded steel bars 17 on both sides are butted and bound, and then poured concrete into the reserved gap. 16. Fill the reserved gap with the post-cast concrete 16 until the post-cast concrete 16 is solidified and formed; finally, the prestressed steel bar 3 is stretched and the anchoring is completed, and the construction is completed.

The solutions in the embodiments are not intended to limit the scope of the patent protection of the present invention, and all equivalent implementations or changes that do not depart from the present invention are included in the scope of the patent of this case.

Claims (3)

1. a prefabricated prestressed steel and concrete splicing continuous composite beam, is characterized in that: comprise prefabricated concrete slab, prestressed I-beam, prestressed steel bar, shear force connector, steel beam connector and concrete slab connector; The prefabricated concrete slab is fixed on the top of the upper flange of the prestressed I-beam, the shear connector is pre-buried inside the prefabricated concrete slab, and the shear connector is welded and fixed on the top of the upper flange of the prestressed I-beam; The prestressed steel bars are arranged below the upper flange of the prestressed I-beam, above the lower flange or below the lower flange; the prestressed I-beam is fixedly connected by a steel beam connecting member when the prestressed I-beam is butted; the precast concrete slab is butted Fixed connection through concrete slab connection members. 2. A prefabricated prestressed steel and concrete splicing continuous composite beam according to claim 1, wherein the steel beam connecting member comprises a web connecting steel plate, an upper flange connecting steel plate and a lower flange connecting steel plate; The web connecting steel plates are overlapped between the webs of two butt-jointed prestressed I-beam beams, and the web connecting steel plates and the prestressed I-beam webs are fixedly connected by web connecting bolts; The upper flange connecting steel plate is overlapped between the upper flanges of the two butted prestressed I-beam beams, and the upper flange connecting steel plate and the upper flange of the prestressed I-beam are fixedly connected by the upper flange connecting bolts, and the upper flange is connected. The upper end of the bolt is pre-buried in the precast concrete slab; the lower flange connecting steel plate is overlapped between the lower flanges of the two butted prestressed I-beam beams, and the lower flange connects the steel plate and the lower wing of the prestressed I-beam beam The flanges are connected to each other by connecting bolts of the lower flange. 3. A prefabricated prestressed steel and concrete splicing continuous composite beam according to claim 1, characterized in that: the concrete slab connecting member comprises four structural forms; the concrete slab connecting member of the first structural form comprises a precise Rolling bolts and bolts reserved holes, the bolt reserved holes are set in the precast concrete slab through pre-embedded molds or corrugated pipes, and the precast concrete plate at the rear end of the bolt reserved holes is provided with a reserved concrete post pouring groove. The bolts are inserted into the reserved holes for the bolts of the two butt-jointed precast concrete slabs, and the two butt-jointed precast concrete slabs are fixedly connected by finishing bolts; The holes are reserved, and the reserved holes for the anchor cables are set in the precast concrete slab through embedded molds or corrugated pipes, and there are reserved anchoring grooves on the precast concrete slab at the rear end of the reserved holes for the anchor cables. In the reserved holes for the anchor cables of the butted precast concrete slabs, the two butted precast concrete slabs are fixedly connected by the anchor cables; the connecting components of the concrete slabs of the third structural form include the anchor cables, the post-cast concrete and the reserved holes for the anchor cables. , the anchor cable reserved channel is set in the precast concrete slab through the embedded mold or corrugated pipe, the prefabricated concrete slab at the rear end of the anchor cable reserved channel is provided with a reserved anchoring groove, and the two butted prefabricated concrete slabs are provided with The reserved gap is encapsulated by the post-cast concrete, and the anchor cable is provided with a reserved hole in the post-cast concrete through a pre-embedded mold or a corrugated pipe. In the reserved channel of the anchor cable in the poured concrete, the two butt-jointed precast concrete slabs are fixedly connected by the anchor cable and post-cast concrete; The steel bars are fixed on the precast concrete slabs, there is a reserved gap between the two butted precast concrete slabs, and the embedded steel bars extend into the reserved gaps. In pouring concrete, two butt-jointed precast concrete slabs are fixedly connected by pre-embedded steel bars and post-cast concrete.

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