Novel buoyancy type open caisson and construction method thereof

A buoyancy-type caisson technology, applied in caissons, infrastructure engineering, protective devices, etc., can solve the problems of increased foundation burden, insufficient foundation bearing capacity, large settlement of caisson foundation after construction, etc., to prevent water seepage and reduce foundation Stress, the effect of reducing settlement

Active Publication Date: 2020-07-28
CHINA MAJOR BRIDGE ENERGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the rapid increase of the structural weight of the caisson to the weight of the whole bridge, the bearing capacity of the foundation is insufficient
Usually, caissons have no water-stopping measures on the bottom plate. After the construction is completed, the well holes are already filled with water. This part of the water weight increases the burden on the foundation, and also increases the settlement of the bridge foundation after construction, resulting in Large settlement after foundation construction

Method used

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  • Novel buoyancy type open caisson and construction method thereof
  • Novel buoyancy type open caisson and construction method thereof
  • Novel buoyancy type open caisson and construction method thereof

Examples

Experimental program
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Embodiment 1

[0051] see figure 1 and figure 2 As shown, the embodiment of the present invention provides a novel buoyancy caisson, comprising:

[0052] In the caisson, there are wellbore units arranged in a matrix, and the wellbore units arranged in a matrix are arranged with multiple circles of wellbore units from the inside to the outside according to the design requirements. The two adjacent wellbore units They are separated by the caisson well wall 1, and the caisson well wall 1 is a vertical and horizontal wall structure. The cross section of the well hole unit is any one or more of rectangle, regular polygon, circle or ellipse. In order to facilitate description and distinction, this embodiment takes a caisson with three circles of wellbore units as an example to describe in detail. A well unit 13 and a third circle of well units 14 . Wherein the number of the well hole units 12 in the first circle is two holes, the number of the well hole units 13 in the second circle is ten ho...

Embodiment 2

[0062] see figure 1 and image 3 As shown, the embodiment of the present invention provides a new type of buoyant caisson. The difference between this embodiment and Embodiment 1 is that cement-based seepage crystallization is arranged between the bottom sealing concrete slab 4 and the upper waterproof composite dry-beaten concrete bottom slab 5. Permanent waterproof coating 6, the cement-based permeable crystalline waterproof coating 6 is used to prevent the bottom concrete slab 4 from seeping water. The cement-based permeable crystalline waterproof coating 6 can prevent water seepage from the micro-cracks inside the first back-sealing concrete, improve the bonding and water-stopping between the bottom-sealing concrete slab 4 and the caisson well wall 1 and the self-impermeability and water-stopping of the bottom-sealing concrete slab 4 .

[0063] After the cement-based permeable crystalline waterproof coating 6 encounters water, its active chemical substances, driven by the...

Embodiment 3

[0066] see figure 1 and image 3 As shown, the embodiment of the present invention provides a new type of buoyancy caisson. The difference between this embodiment and embodiment 1 is that the upper water-stop composite dry-beaten concrete bottom plate 5 is surrounded by the caisson wall 1 of the well hole unit. A steel edge waterstop 7 is provided, and the steel edge waterstop 7 is used to close the water seepage channel around the upper layer waterstop composite dry-beaten concrete bottom plate 5 along the caisson well wall 1. The steel edge waterstop 7 is arranged inclined upwards, and the steel band of the steel edge waterstop 7 is fixedly connected with the caisson well wall 1 of the well hole unit. The steel edge waterstop 7 is inclined upward at an angle of 30° to 60°, and the steel edge waterstop 7 is poured in the upper waterstop composite dry-beaten concrete floor 5 . The angle of upward inclination of the steel edge waterstop 7 is 30° to 60° to facilitate concrete ...

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Abstract

The invention discloses a novel buoyancy type open caisson and a construction method thereof, and belongs to the technical field of bridge deep water open caisson foundation construction. The novel buoyancy type open caisson comprises an open caisson body, first shear force tenons, second shear force tenons, a bottom layer top seal concrete plate, an upper layer waterstop composite dry beating concrete bottom plate and an open caisson top cover. Well hole units which are arranged in a matrix manner are mounted in the open caisson body, every two adjacent well hole units are partitioned throughan open caisson wall, the first shear force tenons and the second shear force tenons are located on the bottoms of the well hole units, the bottom layer top seal concrete plate is located on the bottoms of the well hole units and is connected with the first shear force tenons, the upper layer water stop composite dry beating concrete bottom plate is in seal connection to the top of the bottom layer top seal concrete plate and is connected with the second shear force tenons, the open caisson top cover is located on the top of the open caisson, and water passing holes communicating with the well hole units are formed in the open caisson top cover. The open caisson has the good waterstop property, when the interior of the open caisson is in the water-free state, the open caisson generates buoyancy, and the aim of settlement after work of an open caisson foundation can be achieved.

Description

technical field [0001] The invention relates to the technical field of bridge deep-water caisson foundation construction, in particular to a novel buoyancy caisson and a construction method thereof. Background technique [0002] With the continuous increase of the span of the bridge, the scale of the caisson foundation is also increasing. The caisson foundation refers to an empty or multi-chamber well box structure. The water depth and covering layer reach the predetermined elevation, clear the base or rock surface in the wellbore, and pour the underwater concrete back cover to form the bridge foundation. According to different construction methods, it can be divided into several types such as heavy caissons under the island, floating caissons and self-floating caissons, and floating caissons directly set up. The caisson foundation has the characteristics of high rigidity, strong resistance to horizontal loads, and high vertical bearing capacity. [0003] Due to the rapid ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/06E02D31/06E02D23/02
CPCE02D23/02E02D27/06E02D31/06
Inventor 秦顺全谭国宏傅战工郑清刚陆勤丰唐超杜勋苑仁安孙建立
Owner CHINA MAJOR BRIDGE ENERGINEERING
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