长距离高压高强泵送混凝土设计及施工.pdf

桥梁建设2012年第42卷增刊1(总第216期)
Bridge Construction, Vol 42, Supplement No. 1, 2012(Totally No 216)
文章编号:1003-4722(2012)S1-0090一04
长距离高压高强泵送混凝土设计及施工
刘昌国,张书良
(中国建筑第六工程局有限公司桥梁公司,天津300457)
摘要:为保证高强度混凝土长距离输送的和易性和可泵性,以白马大桥(三跨变截面预应力
混凝土连续刚构桥)为背景,从原材料的选择和控制,配合比的选配,混凝土的生产、运输、泵送等环
节对长距离、高压、高强泵送混凝土进行设计和施工。在配合比设计时增加外掺料,采用三级配的
碎石,使用高性能的外加剂和选择高压混凝土输送泵,从施工工艺和养护措施上保证混凝土的强度
达到设计要求,可以使混凝土的和易性(保证无泌水、无泌浆、无沉淀抓底现象)、可泵性、凝结时间、
强度及耐久性均满足气候、施工技术条件及混凝土质量要求。
关键词:连续刚构桥;混凝土;配合比;原材料
中图分类号:TU528
文献标志码
Design and Construction of High-strength Concrete
Pumped from Long Distance and by High Pressure
LIU Chang-guo, ZHANG Shu-liang
Bridge Company, China Construction Sixth Engineering Co, Ltd, Tianjin 300457, China
Abstract: To ensure the workability and pumpability of the high-strength concrete delivered
from long distance, the Baima Bridge (a three-span prestressed concrete continuous rigid-frame
bridge with variable section) was cited as an example, the high-strength concrete for the bridge
was designed and constructed from aspects of the selection and quality control of the raw materi-
als, mix proportioning design, concrete production, delivery and pumping. In the mix proportio
ning design, the admixtures and cracked stones of three gradings were used so as to ensure that
the concrete strength could meet the design requirements through utilization of the high perform-
ance admixture, high pressure concrete delivery pumps and the appropriate workmanship and cu-
ring measures. The concrete proportioned like that could ensure the quality of the concrete (with
no water, no mortar bleeding and no settlement) and the pumpability, setting time, strength and
durability could all accommodate to the climate conditions, construction technical conditions and
construction quality requirements
Key words: continuous rigid-frame bridge; concrete; mix proportioning; raw material
1概述
及施工控制是该桥混凝土施工的关健。本文从原材
白马大桥为74m+135m+74m三跨变截面料的控制、配合比的选配,混凝土的生产、运输及浇
预应力混凝土连续刚构桥。混凝土在拌合站集中拌筑等方面来削述长距离、高压、高强泵送混凝土设计
合,采用高压输送混凝士泵进行泵送,最大泵送距离及施工要点
400m,泵送高度达90m。为了保证白马大桥长距
离高压高强泵送混凝土的可泵性及混凝土强度、耐2混凝土配合比
久性达到设计使用要求,混凝土配合比的设计、泉送
针对白马大桥泵送距离长、泉送压力大、夏季施
收稿日期:2012--10-29
作者简介:刘昌国,工程师,F-mail:455406612@q.com。研究方向:桥粱与水泥混凝士。