Prefabricated and assembled UHPC formwork type component for combined bent cap gate-type pier

Abstract

The utility model relates to the technical field of bridge construction, in particular to a prefabricated assembly UHPC formwork type component for a combined bent cap gate type pier, which comprises a midspan section and a beam end section, the midspan section is composed of two UHPC webs and a UHPC bottom plate, the two UHPC webs are arranged on two sides of the UHPC bottom plate and fixedly connected, and the two UHPC webs are connected with the beam end section. The beam end section comprises a UHPC web plate which is longitudinally connected with the midspan section. The structure has the advantages of being good in construction quality, convenient and fast to manufacture and transport, high in durability and capable of being used as a protection component of an internal bent cap. After being assembled, the component can be used as a construction template for existing line-crossing construction, and the problems of a concrete gate-type pier and a steel cover beam gate-type pier are solved under the condition that the operation of the existing line is not influenced. Meanwhile, the structure and internal concrete form a whole and can serve as a permanent structure to participate in stress in the operation stage, and the bearing capacity of the structure is enhanced. Construction is convenient, economical and reasonable, the effect is good, and the high application and popularization value is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge construction technical field, concretely relates to a kind of prefabricated assembly UHPC formwork type component for combined bent cap portal pier. BACKGROUND

[0002] In modern bridge construction, portal pier has significant advantages when crossing obstacles such as roads and railways due to its unique structural form. When it comes to portal pier construction across railways, traditional concrete portal piers are usually not allowed for construction across railways due to their construction process characteristics, such as large on-site pouring workload, long construction period, and difficulty in effective protection during railway operation. Steel bent cap portal piers can achieve construction across railways, but they also have many problems. On the one hand, the high cost of steel significantly increases the overall project cost. On the other hand, the durability of steel bent cap is relatively poor, and it is prone to rust when exposed to natural environment for a long time, which requires regular corrosion maintenance. This not only increases the maintenance cost in the later period, but also may interfere with railway operation due to maintenance work. In addition, steel bent cap has poor fire resistance, which poses a safety hazard in the event of a fire or other accidents. SUMMARY

[0003] The utility model aims at the deficiency of prior art, and provides a prefabricated assembly UHPC formwork type component for combined bent cap portal pier. The UHPC web and UHPC bottom plate are prefabricated and hoisted. After installation is complete, the overall formwork structure is fixed, and the internal prestressed steel strand of the prefabricated component is tensioned and anchored. Then, the overall UHPC formwork is hoisted, the UHPC overall formwork is hoisted to the portal pier column, and the internal and external concrete is poured. After the cast-in-place concrete reaches the design strength, the remaining steel strand is tensioned, and other post-construction work such as beam erection is carried out.

[0004] The utility model is achieved by the following technical solutions:

[0005] A prefabricated assembly UHPC formwork type component for combined bent cap portal pier, characterized by comprising a mid-span segment and a beam end segment. The mid-span segment is composed of two UHPC webs and one UHPC bottom plate. The two UHPC webs are fixedly connected on both sides of the UHPC bottom plate. The beam end segment includes a UHPC web longitudinally connected to the mid-span segment.

[0006] The contact surface between the UHPC web and the UHPC bottom plate is glued with epoxy resin.

[0007] The UHPC web and the UHPC bottom plate are welded together by a pre-embedded steel plate to form a whole.

[0008] The UHPC webs are integrally formed by internal prestressed steel strands.

[0009] The utility model discloses the advantages are: have very strong practicality, prefabricated assembly UHPC template formula component adopts factory prefabricated field assembly form, and structural construction quality is good, and convenient, and have higher durability can be used as the protection component of internal bent cap. The component assembly can be used as construction formwork to carry out across existing line construction, under the condition of not influencing existing line operation, solve the problem of concrete portal pier and steel bent cap portal pier. Meanwhile, the structure forms a whole with internal concrete, can be used as permanent structure and participate in the stress of operation stage, and strengthen the bearing capacity of structure. Convenient construction, economic and reasonable, good effect has very high popularization and use value. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 It is the assembly drawing of the utility model;

[0011] Figure 2 It is the cross-section drawing of the bridge bent cap of the utility model;

[0012] Figure 3 It is the side view of the portal pier in the utility model;

[0013] Figure 4 It is the prefabricated UHPC web reinforcement drawing in the utility model;

[0014] Figure 5 It is the prefabricated UHPC bottom plate reinforcement drawing in the utility model. DETAILED DESCRIPTION

[0015] The features and other related features of the utility model are further described in detail by embodiment in combination with the drawings, so as to facilitate the understanding of the same industry technical personnel:

[0016] As Figures 1-5 Shown, the various designations in the drawing respectively indicate: prefabricated UHPC web 1, prefabricated UHPC bottom plate 2, stand 3, cross internal concrete 4, beam end internal concrete 5, beam end external concrete 6.

[0017] Embodiment: as Figures 1 to 5 Shown, the combined bent cap portal pier prefabricated assembly UHPC template formula construction in the embodiment is implemented, including the following flow:

[0018] The factory carries out the prefabrication of prefabricated UHPC web 1 and prefabricated UHPC bottom plate 2, is transported to the field after through the glue joint and the prefabricated steel sheet welding and forms "U" type groove cross section segment;Four UHPC webs 1 are used as two side beam end segments through longitudinal glue joint, pin joint and form "U" type groove integral formwork, i.e. bent cap UHPC integral formwork, with multiple cross section segments.

[0019] For convenient transportation, the UHPC integral formwork of the bent cap is longitudinally prefabricated in segments of about 4m for assembly. The single segment is transversely prefabricated and assembled, the contact surface between the two prefabricated UHPC webs 1 and the prefabricated UHPC bottom plate 2 is bonded by epoxy resin, and the whole is formed by welding through the embedded steel plate, and the connecting joint is solidified; or the factory directly prefabricates the "U" shaped groove mid-span segment.

[0020] The UHPC integral formwork of the bent cap in "U" shaped structure is fixed on the assembling jig, the internal prestressed steel strand of the prefabricated component is tensioned and constructed, and the anchor is sealed. The portal bent cap is formed by prefabricated and assembled UHPC formwork components.

[0021] In this embodiment, in order to ensure the stability of the structure, transverse supports and scissors supports are arranged on the prefabricated UHPC web 1 for transverse constraint, and can be removed after construction is completed.

[0022] The UHPC integral formwork of the bent cap is hoisted as a whole, and is fixed and installed at the top surface of the portal bent column 3. The main reinforcement and stirrup reinforcement of the column extend into the interior of the UHPC integral formwork of the bent cap, and are solidified by cast-in-place.

[0023] Based on the above structure, the interior concrete 5 of the beam end and the exterior concrete 6 of the beam end are poured, the interior concrete 4 of the mid-span is poured after the cast-in-place concrete reaches the design strength and elastic modulus, and the transverse supports and the removable scissors supports are removed after all the cast-in-place concrete reaches the design strength and elastic modulus. The remaining steel strands of the bent cap are tensioned in the later stage, and the upper simply supported beam is erected.

[0024] The prefabricated UHPC web and the prefabricated bottom plate are prefabricated in the factory, the longitudinal segments are connected by pin sleeve, the sleeves are arranged in each prefabricated component, the side surface of the first plate is used as an end mold after the first plate is prefabricated, the second plate is poured, and the connection of each sleeve and pin is smooth.

[0025] The interface between the interior of each UHPC component and the cast-in-place concrete in the later construction is roughened to ensure a certain roughness on the side surface, and the connection of the cast-in-place and the prefabricated component is better.

[0026] The prefabricated and assembled UHPC formwork component of the portal bent cap in this embodiment solves the problem of portal bent cap construction across the existing line, has good technical and economic properties, obvious social benefits, and wide application prospect.

[0027] Although the above embodiments have been described in detail with reference to the drawings for the purpose of the concept and embodiments of the present application, those skilled in the art can recognize that various improvements and changes can be made to the present application without departing from the scope defined by the claims, and therefore, detailed description is not given here.

Claims

1. A prefabricated assembled UHPC formwork component for a composite bent-pier bent, characterized in that: The cross section comprises a mid-span segment and a beam end segment, wherein the mid-span segment is composed of two UHPC webs and a UHPC bottom plate, the two UHPC webs are arranged on both sides of the UHPC bottom plate and fixedly connected, and the beam end segment comprises a UHPC web and is longitudinally connected with the mid-span segment.

2. The precast assembling UHPC formwork component for bent cap and portal pier according to claim 1, characterized in that: The contact surface between the UHPC web and the UHPC bottom plate is glued by epoxy resin.

3. The precast assembling UHPC formwork component for bent cap and portal pier according to claim 1, characterized in that: The UHPC web and the UHPC bottom plate are welded by a pre-embedded steel plate to form a whole.

4. The precast assembling UHPC formwork component for bent cap and portal pier according to claim 1, characterized in that: The UHPC webs are tensioned by internal prestressed steel strands to form a whole structure.

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