CN-122013777-A - Highway bridge underwater construction system and method

CN122013777ACN 122013777 ACN122013777 ACN 122013777ACN-122013777-A

Abstract

The invention discloses an underwater construction system and method for a highway bridge, and belongs to the technical field of underwater construction of highway bridges. Aiming at the defects of insufficient compactness, poor integrity and the like of the existing underwater bottom sealing construction concrete, the invention provides a construction system comprising a double-layer cofferdam, an inner support bracket, a concrete conveying assembly, a portal frame with an impact assembly and a drainage unit, wherein the portal frame with the impact assembly and the drainage unit are easy to cause construction potential safety hazards such as water burst and piping because the bearing capacity and the impermeability of a substrate soil body are weak, the double-layer cofferdam is used for constructing a water-stopping building envelope during construction, and the bottom sealing concrete is synchronously compacted and reinforced by low-frequency vertical impact in a plastic state before initial setting and is matched with dynamic drainage and impact position regulation. The invention can improve the compactness and the water stopping effect of the back cover structure, strengthen the performance of the substrate soil body, reduce the construction safety risk and ensure the underwater construction quality of the bridge.

Inventors

JIANG YICHEN
WANG YANBO
WANG SHENGXU
LI CHANGZHE
LIU XI
WANG HUAJIE
WANG YILIN
SHAN HAIJING
ZHAO CHEN
Chang Zhelun

Assignees

山东省路桥集团有限公司

Dates

Publication Date: 20260512
Application Date: 20260326

Claims (10)

1. An underwater construction system for highway bridges, comprising: A cofferdam is enclosed to form a construction space; The support (4) is supported in the cofferdam, the side wall of the support (4) is attached to the inner wall of the cofferdam, and the cofferdam is supported; the conveying component is arranged on the bracket (4) and is used for conveying concrete to a construction surface to form a concrete bottom sealing layer (7); The cofferdam is characterized by comprising a portal frame (801), wherein the portal frame (801) is arranged outside the cofferdam, an impact assembly (8) is connected to the portal frame (801), an impact end of the impact assembly (8) is connected with an impact plate (806) for compacting a concrete bottom sealing layer (7), a drain pipe (11) for evacuating a construction space is further arranged on the portal frame (801), and the drain pipe (11) is connected with a drain pump (10).
2. The underwater construction system of the highway bridge according to claim 1, wherein the cofferdam comprises an outer layer weir body (1), an inner layer weir body (2) is arranged on the inner side of the outer layer weir body (1), a support (4) is supported on the inner side of the inner layer weir body (2), a filling cavity (3) is formed between the outer layer weir body (1) and the inner layer weir body (2), and graded sand and stone are filled in the filling cavity (3).
3. The underwater construction system for highway bridges according to claim 1, wherein the conveying assembly comprises a conveying pipeline (5), a connecting pulley frame (6) is sleeved outside the conveying pipeline (5), and the pulley frame (6) is connected to the inner wall of the bracket (4).
4. The underwater construction system for highway bridges according to claim 1, wherein the impact assembly (8) comprises a vertical sliding rail (802) arranged in the middle of the portal frame (801), a movable frame (803) is connected to the vertical sliding rail (802), a vertical impact hammer (804) is connected to the movable frame (803), and an impact plate (806) is connected to the bottom of the vertical impact hammer (804).
5. The underwater construction system for highway bridges according to claim 1, wherein a laser range finder (9) is provided on the movable frame (803) for detecting the distance between the movable frame (803) and the concrete foundation layer (7) and adjusting the operation of the hoist (807) by a control module on the gantry (801).
6. An underwater construction method using the highway bridge underwater construction system as claimed in any one of claims 1 to 5, comprising the steps of: S1, cofferdam construction, namely positioning and paying off in a target construction water area, sequentially inserting an outer layer weir body (1) and an inner layer weir body (2), enclosing the two layers of weir bodies to form a filling cavity (3), filling graded sand and stone into the filling cavity (3) in a layer and vibrating to form a water-stopping cofferdam structure, installing a bracket (4) in a construction space, enabling the side wall of the bracket (4) to be attached to the inner wall of the inner layer weir body (2) to form an internal support, and supporting a portal frame (801) on a stable foundation at the outer side of the cofferdam to finish construction system main body construction; S2, initial precipitation and construction surface pretreatment, namely starting a drainage pump (10) on a portal frame (801), pumping and draining the water body in the construction space to the outside through a drainage pipe (11) until the water level falls below a preset water level, cleaning sludge, floating soil and sundries at the bottom of the construction space, and leveling a substrate soil body; S3, back cover concrete pouring construction, namely arranging a conveying pipeline (5) along the inner wall of the bracket (4), guiding and limiting and fixing the conveying pipeline (5) through a pulley frame (6), continuously pouring underwater concrete to the surface of a substrate soil body through the conveying pipeline (5), and forming a complete concrete back cover layer (7) at the bottom of a construction space; s4, installing an impact assembly (8), namely installing and debugging the impact assembly (8) on a portal frame (801), aligning a vertical impact hammer (804) with an impact plate (806) at the bottom to a central region of a construction space, debugging the stroke and initial impact interval of the impact hammer, and finishing preparation before impact; S5, impact compaction, namely starting a vertical impact hammer (804) when the concrete bottom layer (7) is in a plastic state before initial setting, driving an impact plate (806) to periodically and vertically impact the upper surface of the concrete bottom layer (7), enabling impact force to downwards and peripherally diffuse through the concrete bottom layer (7), and synchronously completing compaction and reinforcement on soil bodies at the bottom of the cofferdam and soil bodies at the periphery of the side wall of the cofferdam; S6, adjusting impact positions and draining water, namely driving a movable frame (803) to lift along a vertical sliding rail (802) through a winch (807) in the impact process, detecting the distance between the movable frame (803) and the upper surface of a concrete sealing layer (7) in real time through a laser range finder (9), dynamically adjusting the impact height and impact interval of an impact plate (806), and continuously pumping out water seepage and concrete bleeding in a construction space through a drainage pump (10) and a drainage pipe (11), so that the input end of the drainage pipe (11) is always kept at a preset water level above the concrete sealing layer (7); S7, compacting, forming and checking, namely stopping dewatering and impacting operation after the concrete bottom sealing layer (7) is solidified to reach the design strength, detecting the flatness and compactness of the concrete bottom sealing layer (7) and the reinforcing effect of a substrate soil body, finishing bottom sealing construction after checking is qualified, and entering a subsequent bridge foundation construction process.
7. The underwater construction method according to claim 6, wherein the outer layer weir (1) and the inner layer weir (2) are both of a wave-shaped steel plate structure and are inserted into a river bed to a base layer by a vibrating device.
8. The underwater construction method according to claim 6, wherein the lower surface of the impact plate (806) has an arc-shaped structure with a high center and a low edge to form a pressure wave spreading toward the periphery when impacting the concrete bottom layer (7).
9. The underwater construction method according to claim 6, wherein the impact hammer drives the impact plate (806) to impact the concrete foundation layer (7) at an impact frequency of 0.02Hz to 0.2 Hz.
10. The underwater construction method according to claim 6, wherein the input end of the drain pipe (11) is positioned in the inner layer weir body (2), the middle part of the drain pipe (11) is fixedly connected with the movable frame (803), so that the drain pipe (11) moves synchronously along with the lifting of the movable frame (803), and the lower end of the drain pipe is always positioned above the concrete bottom sealing layer (7).

Description

Highway bridge underwater construction system and method Technical Field The invention belongs to the technical field of highway bridge underwater construction, and particularly relates to a highway bridge underwater construction system and a highway bridge underwater construction method. Background Along with the continuous perfection of the road traffic infrastructure network in China, the number of river-crossing, sea-crossing and river-crossing large-span highway bridge projects is continuously increased, and the underwater construction of bridge piers and bearing platform foundations is a core key link of the projects. The key technical difficulty of underwater construction is that a closed enclosure structure with reliable water stopping performance and strong structural stability is constructed, meanwhile, the compactness and impermeability of a base back cover structure are guaranteed, a safe and dry operation environment is provided for subsequent bridge foundation construction, and quality and safety accidents such as cofferdam instability, base water surge, piping, sedimentation deformation and the like are avoided in the construction process. At present, the underwater construction of highway bridges is generally carried out by adopting a cofferdam method, the main stream cofferdam forms comprise steel sheet pile cofferdam, steel sleeve cofferdam, concrete cofferdam and the like, the conventional construction process comprises the steps of inserting and beating or sinking the cofferdam in a target construction water area to form a closed enclosure structure, pumping out the water body in the cofferdam through a drainage system, cleaning a substrate after the internal water level is reduced, pouring underwater back cover concrete by adopting a conduit method, and carrying out subsequent bridge pier and bearing platform structure construction after the back cover concrete reaches the design strength. In the prior art, a conduit method is generally adopted for underwater bottom sealing concrete pouring, the underwater complex pouring environment is affected, the concrete is easy to have defects of segregation, bleeding, honeycomb pitting surface, pile breakage and the like, the integrity, compactness and water stopping effect of a bottom sealing structure are difficult to meet design requirements, meanwhile, the conventional bottom sealing construction only depends on the dead weight of the concrete to realize the lamination with a base soil body, the sealing and reinforcement of the riverbed soil body at the bottom and the periphery of a cofferdam cannot be realized, the bearing capacity of the base undisturbed soil body is insufficient, the impermeability is poor, the problems of base rising, penetration of a seepage channel, piping and the like are extremely easy to occur in the subsequent precipitation and superstructure construction process, and the construction safety is threatened. Disclosure of Invention In order to solve the problems in the prior art, an underwater construction system and an underwater construction method for highway bridges are provided. The underwater construction system for the highway bridge comprises a cofferdam, a support, a conveying assembly, a portal frame, an impact assembly, a drain pipe and a drain pump, wherein the cofferdam is formed by enclosing, the support is supported in the cofferdam, the side wall of the support is attached to the inner wall of the cofferdam to support the cofferdam, the conveying assembly is arranged on the support and used for conveying concrete to a construction surface to form a concrete bottom layer, the portal frame is supported outside the cofferdam, the impact assembly is connected to the portal frame, the impact end of the impact assembly is connected to an impact plate used for compacting the concrete bottom layer, and the drain pipe used for draining the construction space is further arranged on the portal frame and connected with the drain pump. The cofferdam comprises an outer layer weir body, an inner layer weir body is arranged on the inner side of the outer layer weir body, a bracket is supported on the inner side of the inner layer weir body, a filling cavity is formed between the outer layer weir body and the inner layer weir body, and graded sand stone is filled in the filling cavity. Preferably, the conveying assembly comprises a conveying pipeline, a connecting pulley frame is sleeved outside the conveying pipeline, and the pulley frame is connected to the inner wall of the bracket. Preferably, the impact assembly comprises a vertical sliding rail arranged in the middle of the portal frame, a movable frame is connected to the vertical sliding rail, a vertical impact hammer is connected to the movable frame, and an impact plate is connected to the bottom of the vertical impact hammer. Preferably, a laser range finder is arranged on the movable frame and used for detecting the distance between the movable frame and th