CN-224213110-U - Semi-precast segment spliced semi-cast-in-situ large cantilever prestressed concrete bent cap

CN224213110UCN 224213110 UCN224213110 UCN 224213110UCN-224213110-U

Abstract

The utility model discloses a half-prefabricated segment spliced half-cast-in-situ large cantilever prestressed concrete capping beam, which comprises a shell prefabricated part, a main beam prefabricated part and an ultra-high performance concrete connecting layer, wherein the shell prefabricated part is formed by three sections of splicing, the main beam prefabricated part is formed by three sections of splicing seams of the three sections of main beam prefabricated parts and the splicing seams of the three sections of shell prefabricated parts are staggered, a corrugated pipe is arranged in the spliced main beam prefabricated part, a prestressed steel strand bundle is arranged in the corrugated pipe in a penetrating manner, the ultra-high performance concrete connecting layer is formed in a cavity between the shell prefabricated part and the main beam prefabricated part by cast-in-situ construction, and a steel reinforcement framework is further arranged in the ultra-high performance concrete connecting layer. The cover beam is integrally connected with the inside and the outside to bear force, the structure is simple, the design is reasonable, the construction is convenient, and the comprehensive economic benefit is improved.

Inventors

DING ZENGQIANG
ZHAO XIN
ZHAO YONGQIAN
ZHAO YUPING
LIU XIUJUAN
ZHANG JUNSHAN
WEI SHENGMIN
ZHANG QIANG
Liu Xiasen
ZHANG LU
LI WENBO
ZHANG MINMIN
Geng Dianguo
CUI RUI
Ni Mingwei
WANG ZHIXIU
WANG YING
ZHANG WENGYU
GAO YANG
SU JIAZHAN
GUO YOUZHI
Xu Tiantao
WANG ZHENJUN
YANG XINYAN
YAN LIMING

Assignees

中国铁路济南局集团有限公司科学技术研究所

Dates

Publication Date: 20260508
Application Date: 20250512

Claims (7)

1. A semi-precast segment spliced semi-cast-in-situ large cantilever prestressed concrete capping beam is characterized by comprising a shell precast member (10), a girder precast member (20) and an ultra-high performance concrete connecting layer (30), wherein the shell precast member (10) is formed by three segments in a spliced mode, mechanical connection and slurry leakage prevention joint filling are carried out at the splicing seams of two adjacent shell precast members, the shell precast member is a reinforced concrete precast member with a U-shaped section and is placed on the pier top, the girder precast member (20) is formed by three segments in a spliced mode, the splicing seams of the three segments of girder precast members and the splicing seams of the three segments of shell precast members are staggered, a corrugated pipe is arranged in the spliced girder precast member, the three segments of girder precast member (20) are integrated under the tensioning effect of the prestressed steel strand, shear keys or/and/or a stretching surface are arranged on the surfaces of the shell precast member or/and the girder precast member, and a cavity between the shell precast member and the girder precast member is formed through cast-in-situ construction, and the ultra-high performance reinforced concrete layer (31) is further arranged in the ultra-high performance reinforced concrete layer.
2. The half prefabricated segment spliced half cast-in-situ large cantilever prestressed concrete bent cap according to claim 1, wherein the shell prefabricated part (10) or/and the main beam prefabricated part (20) is/are provided with a steel bar perforation connected with a main pier rib, and are welded or grouted.
3. The half prefabricated segment spliced half cast-in-situ large cantilever prestressed concrete bent cap of claim 1, wherein the splicing seams of the two outer shell prefabricated members are mechanically connected with adjacent main bars through reinforcing steel bar sleeves.
4. The semi-prefabricated segment spliced semi-cast-in-situ large cantilever prestressed concrete bent cap of claim 1, wherein the reinforcement cage (31) and the shear key are fixed in an auxiliary manner by welding or binding.
5. The half prefabricated segment spliced half cast-in-situ large cantilever prestressed concrete bent cap of claim 1, wherein the splicing surface of the main girder prefabricated component is provided with stepped concave-convex matching.
6. The half prefabricated segment spliced half cast-in-situ large cantilever prestressed concrete bent cap of claim 1, wherein the corrugated pipes between adjacent main girder prefabricated components are connected through sleeve joints.
7. The semi-prefabricated segment assembled semi-cast-in-situ large cantilever prestressed concrete bent cap of claim 1, wherein the cross section of the ultra-high performance concrete connecting layer is in a shape of a four-sided enclosed opening or a three-sided enclosed U.

Description

Semi-precast segment spliced semi-cast-in-situ large cantilever prestressed concrete bent cap Technical Field The utility model relates to the technical field of bridge precast segment assembly construction, in particular to a semi-precast segment assembly semi-cast-in-situ large cantilever prestressed concrete capping beam and a construction method. Background With the development of transportation industry in China, large-scale urban highways mainly adopt viaduct construction technology to form crossing municipal roads, and the concept of a large cantilever prestress bent cap is developed on the premise of ensuring that not only enough driving width is ensured on a viaduct, but also a large space and a good sight are ensured under the viaduct. However, if the construction method of pouring concrete on site is adopted, the formwork is required to be cast in situ, and the defects of longer traffic blocking, large overhead working capacity, long construction period and the like are also faced. If an integral prefabrication scheme is adopted, the prefabricated bent cap dead weight is very large, the requirements on hoisting equipment and transportation machinery are high, and the construction adaptability is poor. Therefore, the technology of sectionally prefabricating and assembling the prestressed concrete bent cap is an effective scheme for solving the problems of transportation and hoisting of the integral cast-in-situ bent cap aiming at the large cantilever prestressed concrete bent cap structure, and has been successfully applied to a plurality of engineering projects. However, the design of the large cantilever prestressed concrete capping beam structure faces the key problems of prefabrication, segment division, segment connection, segment-pier column connection and the like, and the rationality and feasibility of the design must be practically ensured by combining engineering. Meanwhile, as the longitudinal ribs of the segment prefabricated assembled bent cap are cut off, force transmission is possibly discontinuous, and water seepage is easy to occur at the joint, so that the longitudinal ribs are key to influencing the stress performance of the segment prefabricated bent cap. For example, chinese patent document CN202321099700.1 discloses a prefabricated assembled capping beam of a segment, which includes a middle segment disposed at an upper end of a pier column and cantilever segments spliced with left and right ends of the middle segment, wherein U-shaped stirrups of the pier column pass through slots of the middle segment to be positioned, and fixed steel pipes of the cantilever segments at both ends horizontally pass through the U-shaped stirrups until being inserted into fixing holes of the middle segment, so that the prefabricated pier column, the middle segment and the cantilever segments are assembled together. The convenience of hoisting and installation is realized by dividing the hoisting device into three sections. However, the overall mechanical properties of this technique are poor, and in particular, a complete whole cannot be formed between the three segments. Disclosure of utility model In view of the defects of the prior art, the technical problem to be solved by the utility model is to provide the semi-precast segment assembled semi-cast-in-situ large cantilever prestressed concrete bent cap and the construction method, which not only greatly reduce the number and the engineering quantity of construction supports and templates of the full cast-in-situ concrete bent cap, but also avoid the adverse effect caused by weak mechanical properties at segment joints of the full precast segment assembled bent cap. In order to solve the technical problems, the technical scheme of the utility model is as follows: A semi-prefabricated section spliced semi-cast-in-situ large cantilever prestressed concrete capping beam is characterized by comprising a shell prefabricated part, a main beam prefabricated part and an ultra-high performance concrete connecting layer, wherein the shell prefabricated part is formed by three sections in a spliced mode, mechanical connection and slurry leakage prevention joint filling are carried out at splicing seams of two adjacent shell prefabricated parts, the shell prefabricated part is a reinforced concrete prefabricated part with a U-shaped section, the shell prefabricated part is placed on the pier top, shear keys are arranged on the inner surface of the shell prefabricated part and napped, the main beam prefabricated part is formed by three sections in a spliced mode, the splicing seams of the three main beam prefabricated parts and the splicing seams of the three shell prefabricated parts are staggered, a corrugated pipe is arranged in the spliced main beam prefabricated part, the three main beam prefabricated parts are integrated under the tensioning effect of the prestressed steel stranded wire, the shear keys or/and the napped surfaces are arranged on th