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Single-pile and single-column ductile anti-seismic structure with additional isolation pile casing and construction method

A technology for additional isolation and anti-seismic structures, applied in infrastructure engineering, protective devices, buildings, etc., can solve problems such as large height gaps, failure to meet the requirements of code checking calculations, and short pier, etc., to achieve convenient construction and operation, good economic benefits, The effect of reducing project cost

Pending Publication Date: 2021-11-09
JINAN MUNICIPAL ENG DESIGN & RES INSITITUTE GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the bridge pier with single pile and single column and pier beam consolidation cannot meet the requirements of the code checking calculation under the condition that the pier height difference is too large due to terrain restrictions and the pier is too short overall, the invention proposes a single pile with an additional isolation casing The ductile anti-seismic structure and construction method of a single column are solved through the following technical solutions:

Method used

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  • Single-pile and single-column ductile anti-seismic structure with additional isolation pile casing and construction method
  • Single-pile and single-column ductile anti-seismic structure with additional isolation pile casing and construction method
  • Single-pile and single-column ductile anti-seismic structure with additional isolation pile casing and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] like figure 1 As shown, the pier column 2 with the additional isolation casing is located at the lower part of a three-span cast-in-situ box girder bridge. The end beams of the consolidated box beams are integrally poured together with the superstructure 4 of the bridge. According to the longitudinal section, due to terrain constraints, the height of the two middle piers 2 of the bridge is much smaller than that of the first pier 2. In the process of conventional temperature calculation and seismic calculation, the calculation of the middle pier column cannot meet the requirements. The code requirements also do not meet the seismic design concept. The usual solution is to increase the diameter of the pier column 2, enhance the ultimate bearing capacity of the pier column 2, increase the horizontal stiffness of the pier, and increase the overall cost, which is not effective. Or increase the excavation area and reduce the ground line elevation, thereby increasing the hei...

Embodiment 2

[0058] This embodiment provides a construction method for a ductile earthquake-resistant structure of a single pile and a single column with an additional isolation casing. In this embodiment, the metal bellows is the preferred structure of the isolation casing.

[0059] Include the following steps:

[0060] (a) According to the calculation results of the integrated bridge, calculate the length of the required pier column, determine the length of the metal bellows, and select the metal bellows that meet the requirements according to the embedment depth of the isolation casing;

[0061] (b) Determine the excavation depth of the soil around the pier column according to the specified depth and refer to the construction process;

[0062] (c) pouring pile foundation concrete to the bottom position where the pier column reinforcement is inserted into the pile foundation;

[0063] (d) When pouring the concrete at the top section of the pile foundation, the metal bellows is used as a...

experiment example 1

[0077] Select as attached figure 1 A 3x30m prestressed concrete continuous box girder with steel casing is shown. The diameter of the substructure pier column is 1.3m, the mid-span pier column is a fixed pier, the diameter of the pile foundation is 2m, and the superstructure is a single-box double-chamber prestressed concrete box girder with a width of 9m and a height of 1.7m. The height or length of piers 1 to 4 are 8.9m (8.9m above ground), 8.5m (6m above ground, 2.5m underground), 8.4m (5m above ground, 3.4m underground), and 8.2m (8.2m above ground).

[0078] 1. Calculation formula of pier top stiffness:

[0079]

[0080] In the formula: K i —Stiffness of the top of pier i;

[0081] n—the number of pier columns of a single-row pile bridge;

[0082] 0.8E h1 I h1 ——0.8 times of the product of the elastic modulus of the pier column concrete and the moment of inertia of the column gross section;

[0083] δ HM ,δHM ,δ MH ,δ MM ——The relevant coefficient when calcul...

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Abstract

The invention belongs to the technical field of bridge construction, and discloses a single-pile single-column ductile anti-seismic structure with an additional isolation pile casing and a construction method. The anti-seismic structure comprises an isolation pile casing, a pile foundation and a pier column arranged on the top of the pile foundation; the joint of the pile foundation and the pier column goes deep into the ground; the isolation pile casing is arranged on the pile foundation, and extends upwards to the ground to isolate surrounding soil; and a gap is reserved between the isolation pile casing and the pier column. The height of the pier column can be conveniently changed by adopting the isolation pile casing, so that the height difference of piers in a group is small, and the standard checking calculation requirement is met on the premise that the construction cost is not greatly increased.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a ductile anti-seismic structure and a construction method of a single pile and a single column with an additional isolation casing. Background technique [0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] In the current bridge engineering, the substructure with single pile and single column and pier beam consolidation is widely used in various span bridges with medium and low seismic fortification intensity. The lower part of the longitudinal reinforcement of the pier extends into the pile foundation for anchoring, and the upper part of the longitudinal reinforcement extends into the main beam for anchoring. In the later stage of operation, it bears the transmission of vertical and longitudinal and lateral loads. When the bridge encounters an earthquak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/42E02D27/12E01D19/02E02D31/08
CPCE02D27/42E02D27/12E01D19/02E02D31/08
Inventor 于增明郭子鹏李力张翼郑明万李鹏飞庄欠国解磊李林聪刘松汪蓉绣
Owner JINAN MUNICIPAL ENG DESIGN & RES INSITITUTE GRP
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