Fully-assembled cast-in-place UHPC-RC (Ultra High Performance Concrete-Reinforced Concrete) combined gate-type pier structure

Abstract

The utility model relates to a fully-assembled cast-in-place UHPC-RC (Ultra High Performance Concrete-Reinforced Concrete) combined gate-type pier structure which comprises a bent cap U-groove prefabricated shell and upright post box-type prefabricated shells, the upright post box-type prefabricated shells are respectively arranged on two sides of the bottom of the bent cap U-groove prefabricated shell, and the bent cap U-groove prefabricated shell and the upright post box-type prefabricated shells are connected to form an integral structure. Cover beam cast-in-place concrete is poured in the cover beam U-groove prefabricated shell, stand column cast-in-place concrete is poured in the stand column box type prefabricated shell, and beam column connection cast-in-place concrete is poured at the connection position of the cover beam U-groove prefabricated shell and the stand column box type prefabricated shell. The utility model has the advantages that: the utility model has very strong practicability, not only solves the problem that the conventional gate-type pier structure only adopts a steel cover beam form to span the existing line, reduces the construction cost and maintenance difficulty, but also reduces the number of pier erecting formworks and demolition formworks through the arrangement of the prefabricated assembled shell, and improves the construction efficiency. And the construction is more economical and convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to bridge construction technical field, concretely relates to a kind of full assembly cast-in-place UHPC-RC combined portal pier structure, mainly applied to the portal pier construction of crossing existing line. BACKGROUND

[0002] At present, bridge prefabricated assembly structure is widely applied in the industry with its characteristics of rapid construction, reliable quality, green environmental protection and construction standardization. Prefabricated assembly structure is mainly concentrated in superstructure, bridge deck system and substructure, which greatly optimizes construction process and cost, but for crossing railway work site, due to the influence of railway operation, the sky window period is short, and long-term construction is not possible, so traditional segment assembly is not applicable.

[0003] Traditional crossing railway construction method mainly includes swivel construction, incremental launching construction and integral hoisting construction, and the structure type is limited, and the cost is high. Especially for portal pier structure, steel cover beam integral hoisting construction is generally used for crossing railway, which has high engineering cost and weak stiffness, and the post-maintenance is complex. Using concrete cover beam needs to consider using swivel construction, and the construction process is complex and the cost is high. SUMMARY

[0004] The utility model aims at the deficiency of prior art, and provides a kind of full assembly cast-in-place UHPC-RC combined portal pier structure, which is hoisted by precast cover beam U groove prefabricated shell and column box prefabricated shell, and then internal concrete is poured, after the strength and elastic modulus of internal concrete reach the design requirement, concrete internal steel strand is tensioned, to ensure that the structural strength meets the specification requirements.

[0005] The utility model is realized by the following technical scheme:

[0006] A kind of full assembly cast-in-place UHPC-RC combined portal pier structure, characterized by: including cover beam U groove prefabricated shell and column box prefabricated shell, the bottom of the cover beam U groove prefabricated shell is provided with the column box prefabricated shell on both sides, the cover beam U groove prefabricated shell and the column box prefabricated shell are connected to form an integral structure, cover beam cast-in-place concrete is poured in the cover beam U groove prefabricated shell, column cast-in-place concrete is poured in the column box prefabricated shell, beam-column interface cast-in-place concrete is poured at the intersection of the cover beam U groove prefabricated shell and the column box prefabricated shell.

[0007] The middle span of the cover beam U groove prefabricated shell is composed of two UHPC cover beam webs and a UHPC cover beam bottom plate, wherein the two UHPC cover beam webs are arranged on both sides of the UHPC cover beam bottom plate, and the UHPC is arranged on the step arranged at the bottom of the two UHPC cover beam webs.

[0008] The UHPC cover beam web plate and the UHPC cover beam bottom plate are connected by splicing or directly connected by segmental prefabrication to form an integral structure.

[0009] The prefabricated cover beam U-shaped channel prefabricated shell is composed of two UHPC cover beam web plates corresponding to the position of the column box-shaped prefabricated shell.

[0010] The column box-shaped prefabricated shell is composed of a plurality of UHPC column shells, and the plurality of UHPC column shells are connected by splicing or directly integrally prefabricated.

[0011] The utility model discloses a full assembly cast-in-situ type UHPC-RC combined portal pier structure, which has high practicability, solves the problem that only a steel cover beam is used in the portal pier structure crossing an existing line, reduces engineering cost and maintenance difficulty, reduces the number of pier formwork and formwork removal through the arrangement of the prefabricated and spliced shell, and makes construction more economical and convenient. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a cover beam cross-section diagram in the utility model;

[0013] Figure 2 It is a column cross-section diagram in the utility model;

[0014] Figure 3 It is a side view (cover beam end section) of the utility model;

[0015] Figure 4 It is a front view of the utility model. DETAILED DESCRIPTION

[0016] The features and other related features of the utility model are further described in detail below by combining the drawings with the embodiments, so as to facilitate the understanding of the same industry technical personnel:

[0017] As shown in the drawings, each reference number represents: UHPC cover beam web plate 1, UHPC cover beam bottom plate 2, cover beam cast-in-place concrete 3, UHPC column shell 4, column cast-in-place concrete 5, beam-column joint cast-in-place concrete 6, and adhesive joint 7. Figures 1-4 Embodiment: As shown in the drawings, the full assembly cast-in-situ type UHPC-RC combined portal pier structure in the embodiment includes the following processes when implemented:

[0018] Figures 1 to 4

[0019] ​​First, the UHPC cover beam web plate 1, the UHPC cover beam bottom plate 2 and the UHPC column shell 4 are produced in the factory, and then are assembled and connected on the assembly rack after being transported to the construction site.

[0020] Among them, two UHPC cover beam web plates 1 and one UHPC cover beam bottom plate 2 are assembled and connected to form a cover beam midspan U-shaped groove, or directly prefabricated as a U-shaped groove structure segment. In this embodiment, as shown in Figure 1 , steps are arranged at the bottom positions of the two UHPC cover beam web plates 1, and the UHPC cover beam bottom plate 2 is arranged on the steps arranged by the two UHPC cover beam web plates.

[0021] As shown in Figure 4 , in this embodiment, two segments corresponding to the column positions are arranged on the two sides of the four cover beam midspan U-shaped grooves located at the midspan positions, each segment includes two UHPC cover beam web plates 1, the cover beam midspan U-shaped groove and the four UHPC cover beam web plates 1 on the two sides are connected to form an integral cover beam shell formwork through the adhesive joint 7 and the shear key, and the cover beam shell formwork prestressed tension construction is carried out.

[0022] In this embodiment, the UHPC cover beam shell should be transversely constrained by transverse connection before prestressed tension construction, to ensure the structural stability and construction safety.

[0023] According to the column height, multiple UHPC column shells 4 are connected by adhesive joints 7 and connection sleeves to form two UHPC column shells, or directly prefabricated as an integral UHPC column shell.

[0024] In this embodiment, when the column size is too high, the structure should be connected by using a cross partition plate or a transverse constraint form inside the UHPC column shell 4.

[0025] During construction, the UHPC cover beam U-shaped groove and the column shell structure are assembled and integrally hoisted. According to the total weight of the UHPC prefabricated component, the UHPC cover beam U-shaped groove and the column shell can be divided into three connection and hoisting forms, including:

[0026] 1) Two column shells and one cover beam U-shaped groove, the two column shells are integrally hoisted to the pile cap first, and then the cover beam U-shaped groove is integrally hoisted to the column shell.

[0027] 2) The UHPC cover beam U-shaped groove and the column shell form an integral whole, which is integrally hoisted to the pile cap.

[0028] 3) The UHPC cover beam U-shaped groove is assembled with part of the column shell, and the other single column shell is hoisted to the pile cap, then the cover beam U-shaped groove with part of the column shell is hoisted to the constructed column shell for connection. The integral hoisting is controlled below 300t.

[0029] After the hoisting construction is completed, the column and bent cap reinforcement cage are hoisted to the inside of the box simultaneously, and then the pouring of the column cast-in-situ concrete 5 and the beam-column joint cast-in-situ concrete 6 is carried out, and after the cast-in-situ concrete reaches the required design strength and elastic modulus, the bent cap cast-in-situ concrete 3 is poured.

[0030] After all the cast-in-situ concrete reaches the design strength, the remaining steel strands of the bent cap are tensioned, and the upper simply supported beam is erected synchronously.

[0031] The full-assembly cast-in-situ UHPC-RC combined portal pier of the embodiment solves the problem of the construction limitation of the portal pier span across the existing line.

[0032] Although the above embodiments have been described in detail with reference to the drawings for the purpose of the concept and embodiments of the utility model, those skilled in the art can realize that various improvements and changes can be made to the utility model without departing from the scope defined by the claims, and therefore, detailed description is not given here.

Claims

1. A full-fabric cast-in-situ UHPC-RC composite portal frame pier structure, characterized in that: The utility model relates to a prefabricated housing structure of a box girder U groove and a column box, the bottom of the box girder U groove is provided with the column box, the box girder U groove and the column box are connected to constitute an integral structure, cast-in-situ concrete is poured in the box girder U groove and the column box, and cast-in-situ concrete is poured at the joint of the box girder U groove and the column box.

2. The full-assembled cast-in-situ UHPC-RC composite pylon structure according to claim 1, characterized in that: The cross section of the box girder U groove is composed of two UHPC web plates and a UHPC bottom plate, and the two UHPC web plates are arranged on the two sides of the UHPC bottom plate.

3. The fully-assembled cast-in-situ UHPC-RC composite pylon structure according to claim 2, characterized in that: The UHPC web plate and the UHPC bottom plate are connected by splicing or directly by segmental prefabrication.

4. The fully-assembled cast-in-situ UHPC-RC composite pylon structure according to claim 2, characterized in that: The prefabricated box girder U groove is composed of two UHPC web plates corresponding to the position of the column box.

5. The fully-assembled cast-in-situ UHPC-RC composite pylon structure according to claim 1, characterized in that: The column box is composed of several UHPC column housings, and the UHPC column housings are connected by splicing or directly by integral prefabrication.

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