WO2020114523A1 - 一种双壁围堰及墩身施工方法 - Google Patents

一种双壁围堰及墩身施工方法 Download PDF

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Publication number
WO2020114523A1
WO2020114523A1 PCT/CN2020/070521 CN2020070521W WO2020114523A1 WO 2020114523 A1 WO2020114523 A1 WO 2020114523A1 CN 2020070521 W CN2020070521 W CN 2020070521W WO 2020114523 A1 WO2020114523 A1 WO 2020114523A1
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WO
WIPO (PCT)
Prior art keywords
double
cofferdam
walled
wall
walled cofferdam
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PCT/CN2020/070521
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English (en)
French (fr)
Inventor
邓鹏宇
胡贵松
耿进军
宋艳双
付超
郑辉
黄伟
陈小林
王瑞强
魏凯
Original Assignee
中铁六局集团有限公司
中铁六局集团广州工程有限公司
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Application filed by 中铁六局集团有限公司, 中铁六局集团广州工程有限公司 filed Critical 中铁六局集团有限公司
Priority to ZA2020/02724A priority Critical patent/ZA202002724B/en
Publication of WO2020114523A1 publication Critical patent/WO2020114523A1/zh

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00—Keeping dry foundation sites or other areas in the ground
    • E02D19/02—Restraining of open water
    • E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles

Definitions

  • the present disclosure relates to the technical field of bridge construction, in particular to a double-walled cofferdam and a pier construction method using the double-walled cofferdam.
  • the present disclosure is to provide a double-walled cofferdam and a pier body construction method using the double-walled cofferdam, so as to be able to solve the poor stability of the water retaining structure of the steel cofferdam and the steel sheet pile in the prior art, the poor water stopping effect, and the construction process At least one of the technical issues that requires multiple adjustments.
  • the present disclosure provides a double-walled cofferdam including at least one section of double-walled cofferdam unit.
  • the double-walled cofferdam unit includes a wall body, a blade foot, an inner support rod, and a guide mechanism;
  • the blade feet are arranged at the bottom end of the wall body, the inner support rod is horizontally located inside the wall body panel, and is connected to the inner panel of the wall body;
  • the guide mechanism includes a connecting rod and a guide plate ,
  • the guide plate is connected to the inner wall panel through the connecting rod, the curvature of the guide plate is adapted to the curvature of the outer wall surface of the guard tube of the bored pile, and the guide plate and the guard There is a gap between the outer wall surfaces of the barrel.
  • the wall body includes an inner panel and an outer panel; the inner panel and the outer panel are fixedly connected by a connection structure.
  • the double-wall cofferdam includes two sections of the double-wall cofferdam unit, and the two sections of the double-wall cofferdam unit are vertically spliced.
  • the horizontal section of the double-walled cofferdam is rectangular.
  • the number of the guide mechanisms is multiple, and the plurality of guide mechanisms respectively correspond to the protection tube of the drilled pile.
  • the guide mechanism on the inner panel of the wall body is provided with two layers along the vertical direction, and the guide mechanisms of the two layers correspond to the same vertical line.
  • the distance between the guide plate and the outer wall surface of the protective cylinder is 4 cm.
  • a stiffening plate is further provided at the connection between the connecting rod and the inner wall panel.
  • a lug is provided between the inner panel and the outer panel of the wall, the number of the lugs is multiple, and the multiple lugs are located at the same height and around the circumference of the double-walled cofferdam Set evenly.
  • the axis direction of the hanging hole of the lifting ear is perpendicular to the inner panel and the outer panel, and the hanging hole penetrates the inner panel and the outer panel.
  • the lifting ear includes a base plate and an ear plate, the ear plate is disposed on the bottom plate seat, and the ear plate is fixedly connected to the base plate.
  • a communication tube is provided between the inner panel and the outer panel of the wall body.
  • the number of the communication tubes is plural, the plurality of communication tubes are evenly distributed on the cofferdam, and the plurality of communication tubes are located on the cofferdam at the same height.
  • the number of the inner support rods is plural, and the plurality of inner support rods are arranged at intervals in the vertical direction to divide the double-walled cofferdam unit into multiple layers.
  • the inner panel of the wall body is surrounded by an inner space
  • the inner support rod is provided in the inner space of the wall body
  • the inner support rod is arranged horizontally
  • the inner support rod Both ends are respectively connected to the inner panel.
  • the present disclosure also provides a pier construction method using the double-walled cofferdam described in any of the above technical solutions, which includes the following steps:
  • Step 100 After the pile foundation construction is completed, dismantle the drilling platform
  • Step 200 The double-walled cofferdam unit is processed in the shipyard, the supporting rods are installed in the lifting stage, and the double-walled cofferdam unit is transported to the bridge site;
  • Step 300 Use a floating crane to hoist the first section of the double-walled cofferdam unit, sink the cofferdam to a self-stabilizing state, and cast blade concrete;
  • Step 400 If the double-walled cofferdam unit is a multi-section, use a floating crane to hoist the second double-walled cofferdam unit and the first double-walled cofferdam unit for splicing to ensure the quality of the weld during the assembly process; repeat the hoisting and complete Splicing of multi-section double-wall cofferdam units;
  • Step 500 Digging the soil with a long-arm excavator, cooperate with the sinking measures of the air suction dredger, sink the double-walled cofferdam to the design position, throw the fill stone and crushed stone leveling layer, and cast the back concrete;
  • Step 600 Pumping water in the double-walled cofferdam, and then removing the guide system, cutting off the steel casing and chiseling the pile head;
  • Step 700 Binding the reinforcement of the bearing platform and pouring the concrete of the first layer of the bearing platform. After the strength reaches the design strength, remove the supporting rods in the first layer of the cofferdam and construct the second layer of the bearing platform; repeat the construction to complete the overall pier construction.
  • step 300 further includes pouring the blade legs with concrete after hoisting the self-floating stabilization of the double-walled cofferdam unit at the bottom section, and after the pouring of the concrete concrete cofferdam with blade legs is stabilized, installing a height-connecting platform and a temporary height-limiting guide.
  • the height-direction guide is set with a channel steel spacing of 50 cm.
  • the temporary high-height limit guide is set with double-splitting I-beams.
  • the beneficial effects of the present disclosure include: the present disclosure provides a double-walled cofferdam including at least one double-walled cofferdam unit.
  • the double-walled cofferdam unit includes a wall body, a blade foot, and an inner support bar And the guide mechanism; the blade feet are arranged at the bottom end of the wall body, the inner support rod is horizontally located inside the inner panel of the wall body, and is connected to the inner panel of the wall body;
  • the guide mechanism includes a connecting rod and a guide plate, and the guide plate is connected to the wall through the connecting rod
  • the inner body panel is connected, the curvature of the guide plate is adapted to the curvature of the outer wall surface of the protective tube of the bored pile, and there is a gap between the guide plate and the outer wall surface of the protective tube.
  • the setting of the inner support rod can enhance the stability of the double-walled cofferdam
  • the guide plate is correspondingly provided with the protective tube outside the bottom-drilled pile in the double-walled cofferdam unit, and thus can start the lowering process of the double-walled cofferdam To guide and positioning, to ensure that the double-walled cofferdam is accurately lowered, and there is a certain distance between the guide plate and the outer wall surface of the protective tube, which can ensure the smooth lowering of the double-walled cofferdam.
  • the double-wall cofferdam has been adjusted many times.
  • the double-walled cofferdam provided by the embodiments of the present disclosure has high structural strength and stability, good water stopping effect, and reasonable structural design, and does not require multiple structural adjustments during the construction process to ensure the smooth progress of the project.
  • FIG. 1 is a schematic structural view of a double-walled cofferdam according to an embodiment of the present disclosure when viewed from above;
  • FIG. 2 is a schematic diagram of a side view of a double-walled cofferdam according to an embodiment of the present disclosure from a first perspective;
  • FIG. 3 is a schematic diagram of a side view of a double-walled cofferdam according to an embodiment of the present disclosure from a second perspective;
  • FIG. 4 is a schematic diagram of the position of a guide mechanism of a double-walled cofferdam provided by an embodiment of the present disclosure
  • FIG. 5 is a schematic structural plan view of a guide mechanism of a double-walled cofferdam provided by an embodiment of the present disclosure
  • FIG. 6 is a schematic structural side view of a guide mechanism of a double-walled cofferdam provided by an embodiment of the present disclosure
  • FIG. 7 is a schematic structural view of a lifting ear of a double-walled cofferdam provided by an embodiment of the present disclosure
  • FIG. 8 is a schematic structural diagram of a mounting position of a lifting ear of a double-walled cofferdam provided by an embodiment of the present disclosure.
  • 1-wall body 11-inner panel, 12-outer panel, 2-blade, 3-inner support rod, 4-guide mechanism, 41-connecting rod, 42-guide plate, 43-stiffener plate, 5- Guard tube, 6-hanging ear, 61-base plate, 62-ear plate, 7-pin, 8-connecting tube.
  • connection should be understood in a broad sense, for example, it can be fixed connection or detachable Connected, or connected integrally; either mechanically or electrically; directly connected, or indirectly connected through an intermediary, or internally connected between two components.
  • connection should be understood in a broad sense, for example, it can be fixed connection or detachable Connected, or connected integrally; either mechanically or electrically; directly connected, or indirectly connected through an intermediary, or internally connected between two components.
  • the double-walled cofferdam and the pier construction method using the double-walled cofferdam according to some embodiments of the present disclosure are described below with reference to FIGS. 1 to 8.
  • An embodiment of the present disclosure provides a double-walled cofferdam including at least one double-walled cofferdam unit.
  • the double-walled cofferdam unit includes a wall body 1, a blade foot 2, an inner support rod 3, and a guide mechanism 4;
  • the blade legs 2 are provided at the bottom end of the wall body 1, the inner support rod 3 is horizontally located inside the inner panel 11 of the wall body 1, and is connected to the inner panel 11 of the wall body 1;
  • the guide mechanism 4 includes a connecting rod 41 and a guide plate 42, the guide plate 42 is connected to the inner panel 11 of the wall body 1 through the connecting rod 41, the curvature of the guide plate 42 is adapted to the curvature of the outer wall surface of the guard tube 5 of the bored pile, and There is a gap between the guide plate 42 and the outer wall surface of the protective tube 5.
  • the double-walled cofferdam provided in the embodiments of the present disclosure includes at least one double-walled cofferdam unit.
  • the double-walled cofferdam unit includes a wall body 1, a blade leg 2, an inner support rod 3, and a guide mechanism 4.
  • the wall body 1 may be a double-wall body 1.
  • the double-wall body 1 includes an inner panel 11 and an outer panel 12; a steel box is provided between the inner panel 11 and the outer panel 12.
  • the panel back flute, ring plate and ring angle steel are the same as the structure of the prior art double-wall cofferdam because the arrangement of the steel box, panel back flute, ring plate and ring angle steel is the same as that in the prior art.
  • the blade leg 2 is provided on the lower end surface of the wall body 1.
  • the blade leg 2 includes a blade leg panel, a blade leg angle steel, a stiffening angle steel and a panel backface. Since the blade leg panel and the blade leg angle steel, The arrangement method of the stiffening angle steel and the panel back flute is also the same as the structure of the prior art double-wall cofferdam, which will not be described in detail here.
  • the inner support rod 3 is disposed inside the wall body 1. Specifically, the inner support rod 3 is disposed inside the space surrounded by the inner panel 11, the inner support rod 3 is disposed horizontally, and the inner support Both ends of the rod 3 can be respectively connected to the inner walls on both sides of the space formed by the inner panel 11.
  • the horizontal arrangement of the inner support rod 3 can enhance the stability of the double-walled cofferdam.
  • the guide mechanism 4 is also provided on the inner panel 11.
  • the guide mechanism 4 includes a connecting rod 41 and a guide plate 42.
  • One end of the connecting rod 41 is welded to the inner wall surface of one side of the inner panel 11 to connect
  • the other end of the rod 41 is welded to the guide plate 42 corresponding to the protective tube 5 outside the bottom bored pile in the double-walled cofferdam unit, wherein the guide plate 42 has a curved cross section and guides The bending direction of the plate 42 is toward the protective tube 5.
  • the curvature of the guide plate 42 corresponds to the curvature of the outer wall surface of the protective tube 5.
  • the setting of the guide plate 42 can guide and position the lowering process of the double-walled cofferdam , Configured to ensure that the double-walled cofferdam is accurately lowered, and there is a certain distance between the guide plate 42 and the outer wall surface of the protective tube 5, which can ensure the smooth lowering of the double-walled cofferdam, and can also avoid the double-walled cofferdam during construction
  • the cofferdam has been adjusted many times.
  • the double-walled cofferdam provided by the embodiments of the present disclosure has high structural strength and stability, good water stopping effect, and reasonable structural design, and does not require multiple structural adjustments during the construction process to ensure the smooth progress of the project.
  • the double-walled cofferdam provided by the embodiments of the present disclosure is suitable for deep-water foundation construction or complex construction conditions such as railways, highways, ports, wharves and other deep-water rapid overburden layer thicknesses. Cofferdam construction.
  • the double-walled cofferdam includes two sections of double-walled cofferdam units, and the two sections of double-walled cofferdam units are vertically spliced.
  • the design double-walled cofferdam includes two sections of double-walled cofferdam unit, namely the first section of double-walled cofferdam unit and the second section of double-walled cofferdam unit, the two sections of double-walled cofferdam unit are vertically spliced .
  • the first section double-wall cofferdam unit and the second section double-wall cofferdam unit are first butt welded, and then pasted 10cm wide and 10mm thick long steel strips, which are welded by fillet welding.
  • the height of the welding seam needs to be at least 6mm to ensure the accuracy and stability of the splicing of the two-section double-wall cofferdam unit.
  • double-walled cofferdam can be designed according to the actual application of the double-walled cofferdam including one, three or more sections of double-walled cofferdam units, and the height of each double-walled cofferdam unit is also set according to the specific circumstances , Not specifically limited here.
  • the horizontal section of the double-walled cofferdam is rectangular.
  • the horizontal section of the double-walled cofferdam is rectangular, that is, the entire double-walled cofferdam has a square cofferdam structure.
  • the horizontal bridge direction design of the double-walled cofferdam is 28.6m, and the longitudinal bridge direction design is 21.6m.
  • the number of the guide mechanism 4 is plural, and the plurality of guide mechanisms 4 respectively correspond to the guard tube 5 of the bored pile.
  • the number of the guide mechanisms 4 is multiple, and the plurality of guide mechanisms 4 respectively correspond to the guard tube 5 of the drilled pile, which can ensure the guard tube of the drilled pile of the outer ring 5 At least one guide mechanism 4 corresponds to it to play a guiding role.
  • the number of the guiding mechanism 4 can be 12, and the 12 guiding mechanisms can better ensure the smooth lowering of the cofferdam.
  • the guide mechanism 4 on the inner panel 11 is provided with upper and lower two layers along the vertical direction, and the guide mechanisms 4 of the upper and lower two layers correspond to the same vertical line, so that the process of lowering the double-walled cofferdam It can play two guiding and positioning functions, further ensuring the accuracy of lowering the double-walled cofferdam.
  • the distance between the guide plate 42 and the outer wall surface of the protective tube 5 is 4 cm.
  • the distance between the design guide plate 42 and the outer wall surface of the corresponding protective tube 5 is 4 cm. Field experiments have proved that the double-walled cofferdam can be guaranteed at this distance.
  • the guide plate 42 can play a guiding role to ensure the accurate lowering of the double-walled cofferdam.
  • the length of the guide plate 42 and the distance between the guide plate 42 and the corresponding outer wall surface of the protective tube can be adjusted according to the plane position and verticality of the protective tube on site to ensure smooth lowering of the cofferdam.
  • the height of the welding seam needs to be at least 8 mm to ensure the quality of the welding seam.
  • a stiffening plate 43 is further provided at the connection between the connecting rod 41 and the inner panel 11 of the wall 1.
  • a stiffening plate 43 is further provided at the connection between the connecting rod 41 and the inner panel 11 of the wall 1.
  • the inner panel 11 and the outer panel 12 of the wall body 1 are provided with lifting ears 6.
  • the number of lifting ears 6 may be multiple, and multiple lifting ears 6 are located at the same height And it is evenly arranged around the circumferential direction of the double-walled cofferdam.
  • a lug 6 is provided between the inner panel 11 and the outer panel 12 of the wall body 1, and the axis direction of the hanging hole of the lug 6 is perpendicular to the inner panel 11 and the outer The panel 12 and the hanging holes penetrate the inner panel 11 and the outer panel 12.
  • the pin shaft 7 is inserted into the hoisting hole, and the hoisting device is connected to the pin shaft 7 to realize hoisting the double-walled cofferdam.
  • the number of the lifting lugs 6 is plural, and the plurality of lifting lugs 6 are evenly arranged around the circumferential direction of the double-walled cofferdam and are located at the same height. Multiple lifting lugs 6 can better ensure the stability of lifting.
  • the number of lifting ears 6 is set to 8.
  • the structure of the lifting ear 6 includes a base plate 61 and an ear plate 62.
  • the ear plate 62 is disposed on the bottom plate base.
  • the connection between the ear plate 62 and the base plate 61 may be provided with stiffening
  • the plate 43 in turn, can increase the strength of the lifting lug 6.
  • the lugs 6 are welded with Q235B steel plate with a thickness of 10 mm.
  • the lugs 6 are all fillet welds, the height of the fillet is not less than 8 mm, and the weld is at least a second-level weld.
  • the base plate 61 is welded to the ring plate of the wall body 1 to ensure the safety of the stress point.
  • a communication tube 8 is provided between the inner panel 11 and the outer panel 12 of the wall 1.
  • a communication tube 8 may be provided between the inner panel 11 and the outer panel 12 of the wall 1 The communication pipe 8 communicates with the inside and outside of the cofferdam.
  • the number of the communication pipes 8 is plural, and the plurality of communication pipes 8 are evenly distributed on the cofferdam.
  • the number of the communication tubes 8 is 16, and the communication tubes 8 may use ⁇ 300mm steel pipes.
  • the plurality of communication pipes 8 are located at the same height on the cofferdam.
  • the number of the inner support rods 3 is plural, and the plurality of inner support rods 3 are arranged at intervals in the vertical direction to divide the double-walled cofferdam unit into multiple layers.
  • the number of the inner support rods 3 of each double-walled cofferdam unit is a plurality, and the plurality of inner support rods 3 are vertically arranged at parallel intervals at vertical intervals, wherein the plurality of inner support rods 3
  • the cofferdam unit is divided into multiple layers.
  • the innermost support rod 3 at the bottom layer is the first support rod 3 in the first layer, followed by the inner support rod 3 at the second layer, the support rod 3 at the third layer, and so on.
  • the blade feet 2 have a height of 150 cm; both the inner and outer panels 11 and 12 of the double-walled cofferdam are made of 6 mm steel plates, and the inner and outer panels 12 of the steel box are made of 8 mm steel plates; the back of the panel is made of ⁇ 75 ⁇ 50 ⁇ 8 angle steel, standard spacing 30cm; panel back flute adopts 12.6 section steel at inner support position, spacing is 30cm; hoop angle steel adopts 2 ⁇ 100 ⁇ 10; ring plate adopts 10mm steel plate, corner box adopts 12mm Steel plate and partition board adopt 10mm steel plate.
  • the production process must ensure its design size and weld quality to meet the requirements of the water retaining structure.
  • the embodiments of the present disclosure also provide a method of using the double-walled cofferdam of any of the above embodiments for pier construction.
  • the geology is mainly silt Quality clay and sand layer, so grasping the essence of cofferdam sinking during construction is to reduce the frictional resistance between the cofferdam wall and the soil, so that the cofferdam can sink to its design position by its own weight (or added counterweight).
  • a long-arm excavator is mainly used for excavating and fetching earth, combined with various methods such as suction, water injection, and counterweight in the cabin, to speed up the construction. Progress to ensure the accuracy of lowering the cofferdam.
  • Step 100 After the pile foundation construction is completed, dismantle the drilling platform
  • Step 200 the double-wall cofferdam unit is produced in sections in the in-field workshop, including blanking, assembly and welding of small components, wall panel assembly, sectioned upper tire production and molding, and integrated production in the cofferdam factory;
  • the double-walled steel cofferdam is transported by two barges in parallel and tugs towing.
  • the cofferdam processing plant is hoisted by a 600t gantry crane on a flat barge and then transported to the bridge;
  • Step 300 First of all, make site preparations before the construction, locate the anchor by floating crane, use the 600t floating crane to hoist the first section of the double-walled cofferdam unit, sink the cofferdam to a self-stabilizing state, and cast blade concrete;
  • Step 400 If the double-wall cofferdam unit is a multi-section, use a floating crane to hoist the second double-wall cofferdam unit and the first double-wall cofferdam unit for splicing and welding to ensure the quality of the weld during the assembly process; repeat the hoisting To complete the splicing of multi-section double-wall cofferdam units;
  • Step 500 Digging the soil with a long-arm excavator, cooperating with the sinking measures of the air suction dredger to make the double-walled cofferdam sink uniformly to the design position, throwing fill stones and crushed stones to level the layer, and pouring the back concrete;
  • Step 600 Pumping water in the double-walled cofferdam, then removing the guide system, cutting off the steel casing, and chiseling the pile head;
  • Step 700 Binding the reinforcement of the bearing platform and pouring the concrete of the first layer of the bearing platform. After the strength reaches the design strength, remove the supporting rods in the first layer of the cofferdam and construct the second layer of the bearing platform; repeat the construction to complete the overall pier construction.
  • the advantages of using the above-mentioned cofferdam structure and construction method include at least: the equipment used is generally less than the long-arm excavator, and other equipment is commonly used equipment, and the colocation of the cofferdam in situ subsidence occupies less land.
  • the cofferdam serves as a water-retaining structure for the construction of the platform, and is also used as a formwork for the platform, saving time for the next process.
  • the double-walled cofferdam provided by the embodiments of the present disclosure has high structural strength and stability, good water stopping effect, and reasonable structural design, and does not require multiple structural adjustments during the construction process to ensure the smooth progress of the project.

Abstract

一种双壁围堰及利用该双壁围堰的墩身施工方法。双壁围堰包括至少一节双壁围堰单元，双壁围堰单元包括壁体（1）、刃脚（2）、内支撑杆（3）和导向机构（4）；刃脚（2）设置于壁体（1）底端，内支撑杆（3）水平位于壁体（1）的内面板（11）的内部，并与壁体（1）的内面板（11）相连接；导向机构（4）包括连接杆（41）和导向板（42），导向板（42）通过连接杆（41）与壁体（1）的内面板（11）相连接，导向板（42）的弯曲度与钻孔桩的护筒（5）外壁面的曲率相适配，且导向板（42）与护筒（5）外壁面之间具有间距。该双壁围堰的结构强度、稳定性高，止水效果好，结构设计合理，在施工过程中无需结构进行多次调整，保证工程的顺利进行。

Description

一种双壁围堰及墩身施工方法
相关申请的交叉引用
本申请要求于2018年12月04日提交中国专利局的公开号为201811474784.6、名称为“一种双壁围堰及墩身施工方法”的中国专利公开的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及桥梁施工技术领域，尤其是涉及一种双壁围堰及利用该双壁围堰的墩身施工方法。
背景技术
基于跨江、跨河、跨海的大跨径铁路桥梁修建的背景，而深水基础承台是这类大型项目的控制性工程，深水基础承台受自然条件和技术原因的影响，施工往往不易控制，当外界条件不好的情况下，会严重影响其施工进度。作为此类桥梁施工成败的关键技术：钢围堰施工技术正在不断的革新。目前，在铁路桥梁深水基础施工中，钢围堰与钢板桩是挡水结构以及施工方法的主要方式。
但由于钢围堰、钢板桩等是临时的挡水结构物，是由施工单位自行设计、加工以及下放等操作，进而在施工过程中，比较容易出现结构不合理的情况，因此，此类的工程事故时有发生。具体地，挡水结构物常见的事故主要包括：(1)挡水结构的结构强度以及稳定性不够，在洪水季节时，挡水结构易出现失稳现象，从而会引起财产损失和进度滞后，阻碍工程的顺利进行；(2)挡水结构的止水效果较差，施工过程中需要再次对水下进行封堵；(3)挡水结构的结构设计有缺陷，在施工过程中要对结构进行多次调整，甚至对结构体系进行改造，上述的事故情况都会严重阻碍施工进 程，给施工单位造成不小的影响。
公开内容
本公开在于提供一种双壁围堰及利用该双壁围堰的墩身施工方法，以能够解决现有技术中钢围堰与钢板桩挡水结构稳定性差、止水效果差、施工过程中需要多次调整的技术问题中的至少一个。
本公开提供了一种双壁围堰，包括至少一节双壁围堰单元，所述双壁围堰单元包括壁体、刃脚、内支撑杆和导向机构；
所述刃脚设置于所述壁体底端，所述内支撑杆水平位于所述壁体内面板的内部，并与所述壁体的内面板相连接；所述导向机构包括连接杆和导向板，所述导向板通过所述连接杆与所述壁体内面板相连接，所述导向板的弯曲度与钻孔桩的护筒外壁面的曲率相适配，且所述导向板与所述护筒外壁面之间具有间距。
可选地，所述壁体包括内面板和外面板；所述内面板和所述外面板之间通过连接结构固定连接。
可选地，所述双壁围堰包括两节所述双壁围堰单元，两节所述双壁围堰单元竖向拼接。
可选地，所述双壁围堰的水平截面为矩形。
可选地，所述导向机构的数量为多个，多个所述导向机构分别与所述钻孔桩的护筒相对应。
可选地，所述壁体的内面板上的所述导向机构沿竖直方向设置有两层，两层的所述导向机构对应在同一竖直线上。
可选地，所述导向板与所述护筒外壁面的间距为4cm。
可选地，所述连接杆与所述壁体内面板的连接处还设置有加劲板。
可选地，所述壁体的内面板和外面板之间设置有吊耳，所述吊耳的数 量为多个，多个所述吊耳位于相同高度且绕所述双壁围堰的周向均匀设置。
可选地，所述吊耳的吊孔的轴线方向垂直于所述内面板和所述外面板，且所述吊孔贯穿所述内面板和所述外面板。
可选地，所述吊耳包括底座板和耳板，所述耳板设置于所述底板座上，且所述耳板与所述底座板固定连接。
可选地，所述壁体的内面板和外面板之间设置有连通管。
可选地，所述连通管的数量为多个，多个所述连通管均匀分布于围堰上，且多个所述连通管位于围堰上的高度相同。
可选地，所述内支撑杆的数量为多个，多个所述内支撑杆沿竖直方向交叉间隔设置，将所述双壁围堰单元分隔成多层。
可选地，所述壁体的内面板围设有内部空间，所述内支撑杆设置于所述壁体的内部空间内，且所述内支撑杆呈水平设置，且所述内支撑杆的两端分别与所述内面板连接。
本公开还提供一种利用上述任一技术方案所述的双壁围堰进行墩身施工方法，包括以下步骤：
步骤100、在桩基施工完成后，拆除钻孔平台；
步骤200、双壁围堰单元在船厂加工完成，吊装阶段内支撑杆安装完毕，并将双壁围堰单元运输至桥位处；
步骤300、利用浮吊吊装双壁围堰单元第一节，下沉围堰至自稳状态，浇筑刃脚混凝土；
步骤400、若双壁围堰单元为多节，利用浮吊吊装第二节双壁围堰单元与第一节双壁围堰单元进行拼接，组拼过程中确保焊缝质量；重复吊装，完成多节双壁围堰单元的拼接；
步骤500、通过长臂挖掘机挖土，配合空气吸泥机吸泥的下沉措施，使 双壁围堰下沉到设计位置，抛填片石及碎石找平层，浇筑封底混凝土；
步骤600、双壁围堰内抽水，然后拆除导向系统，割除钢护筒，凿桩头；
步骤700、绑扎承台钢筋，浇筑第一层承台混凝土，待其强度达到设计强度后，拆除第一层围堰内支撑杆，施工第二层承台；重复施工，完成整体墩身施工。
可选地，步骤300还包括在底节双壁围堰单元吊装自浮稳定后，用砼灌注刃脚，浇筑完刃脚混凝土围堰稳定后，安装接高平台及临时接高限位导向。
可选地，所述接高导向采用槽钢间距50cm设置。
可选地，所述临时接高限位导向采用双拼工字钢设置。
与现有技术相比，本公开的有益效果包括：本公开提供了一种双壁围堰，包括至少一节双壁围堰单元，双壁围堰单元包括壁体、刃脚、内支撑杆和导向机构；刃脚设置于壁体底端，内支撑杆水平位于壁体内面板的内部，并与壁体的内面板相连接；导向机构包括连接杆和导向板，导向板通过连接杆与壁体内面板相连接，导向板的弯曲度与钻孔桩的护筒外壁面的曲率相适配，且所述导向板与所述护筒外壁面之间具有间距。
其中，内支撑杆的设置能够增强双壁围堰的稳定性，导向板与双壁围堰单元内底部钻孔桩外的护筒呈相对应设置，进而能够对双壁围堰的下放过程起到导向和定位作用，以确保双壁围堰精准下放，且导向板与护筒外壁面之间具有一定间距，能够保证双壁围堰的顺利下放的基础上，还可以避免在施工过程中对双壁围堰多次调整。
因此，本公开实施例提供的双壁围堰的结构强度、稳定性高，止水效果好，结构设计合理，在施工过程中无需结构进行多次调整，保证工程的顺利进行。
附图说明
为了更清楚地说明本公开具体实施方式或现有技术中的技术方案，下面将对具体实施方式或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本公开的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本公开实施例提供的双壁围堰在俯视的结构示意图；
图2为本公开实施例提供的双壁围堰在第一视角下的侧视结构示意图；
图3为本公开实施例提供的双壁围堰在第二视角下的侧视结构示意图；
图4为本公开实施例提供的双壁围堰的导向机构的位置示意图；
图5为本公开实施例提供的双壁围堰的导向机构的俯视结构示意图；
图6为本公开实施例提供的双壁围堰的导向机构的侧视结构示意图；
图7为本公开实施例提供的双壁围堰的吊耳的结构示意图；
图8为本公开实施例提供的双壁围堰的吊耳安装位置的结构示意图。
其中，1-壁体，11-内面板，12-外面板，2-刃脚，3-内支撑杆，4-导向机构，41-连接杆，42-导向板，43-加劲板，5-护筒，6-吊耳，61-底座板，62-耳板，7-销轴，8-连通管。
具体实施方式
下面将结合附图对本公开的技术方案进行清楚、完整地描述，显然，所描述的实施例是本公开一部分实施例，而不是全部的实施例。
通常在此处附图中描述和显示出的本公开实施例的组件可以以各种不同的配置来布置和设计。因此，以下对在附图中提供的本公开的实施例的详细描述并非旨在限制要求保护的本公开的范围，而是仅仅表示本公开的 选定实施例。
基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
在本公开的描述中，需要说明的是，术语“中心”、“上”、“下”、“左”、“右”、“竖直”、“水平”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。此外，术语“第一”、“第二”、“第三”仅用于描述目的，而不能理解为指示或暗示相对重要性。
在本公开的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本公开中的具体含义。
下面参照图1至图8描述根据本公开一些实施例的双壁围堰及利用该双壁围堰的墩身施工方法。
本公开的实施例提供了一种双壁围堰，包括至少一节双壁围堰单元，双壁围堰单元包括壁体1、刃脚2、内支撑杆3和导向机构4；
参照如1至图5所示，刃脚2设置于壁体1底端，内支撑杆3呈水平位于壁体1内面板11的内部，并与壁体1的内面板11相连接；导向机构4包括连接杆41和导向板42，导向板42通过连接杆41与壁体1内面板11相连接，导向板42的弯曲度与钻孔桩的护筒5外壁面的曲率相适配，且导 向板42与护筒5外壁面之间具有间距。
本公开实施例提供的双壁围堰包括至少一节双壁围堰单元，双壁围堰单元包括壁体1、刃脚2、内支撑杆3和导向机构4。
其中，参照如1至图3所示，壁体1可以为双层壁体1，双层壁体1包括内面板11和外面板12；内面板11和外面板12之间设置有钢箱、面板背楞、环板和环向角钢，由于钢箱、面板背楞、环板和环向角钢的设置方式与现有技术的双壁围堰的结构相同，在此不再详细说明。
参照如2和图3所示，刃脚2设置于壁体1的下端面，刃脚2包括刃脚面板、刃脚角钢，加劲角钢和面板背楞，由于且刃脚面板、刃脚角钢，加劲角钢和面板背楞的设置方式也与现有技术的双壁围堰的结构相同，在此不再详细说明。
参照如图1至图3所示，内支撑杆3设置于壁体1内部，具体地，内支撑杆3设置于内面板11围成的空间内部，内支撑杆3呈水平设置，且内支撑杆3的两端能够分别与内面板11形成的空间两侧内壁相连接。通过内支撑杆3的水平设置能够增强双壁围堰的稳定性。
参照如图4至图6所示，导向机构4也设置于内面板11上，导向机构4包括连接杆41和导向板42，连接杆41的一端与内面板11的一侧内壁面相焊接，连接杆41的另一端与导向板42相焊接，导向板42与双壁围堰单元内的底部钻孔桩外的护筒5相对应设置，其中，导向板42的横向截面呈弯曲状，并导向板42的弯曲方向为向护筒5方向弯曲，导向板42的弯曲度与护筒5外壁面的曲率对应一致，导向板42的设置能够对双壁围堰的下放过程起到导向和定位作用，配置成确保双壁围堰精准下放，且导向板42与护筒5外壁面之间具有一定间距，能够保证双壁围堰的顺利下放的基础上，还可以避免在施工过程中对双壁围堰多次调整。
因此，本公开实施例提供的双壁围堰的结构强度、稳定性高，止水效果好，结构设计合理，在施工过程中无需结构进行多次调整，保证工程的顺利进行。
综上，本公开实施例提供的双壁围堰适用于铁路、公路、港口、码头等水深流急覆盖层厚等复杂地质条件的深水基础施工或工期要求紧张，在淤泥层中的双壁钢围堰施工。
可选地，双壁围堰包括两节双壁围堰单元，两节双壁围堰单元竖向拼接。
在该实施例中，设计双壁围堰包括两节双壁围堰单元，分别为第一节双壁围堰单元和第二节双壁围堰单元，两节双壁围堰单元竖向拼接。在拼接过程中，第一节双壁围堰单元和第二节双壁围堰单元之间先对接焊接，再贴宽10cm、厚10mm的通长钢板条，通过角焊缝的方式进行焊接，焊缝的高度至少需要保证为6mm，进而能够保证两节双壁围堰单元拼接的准确性和稳固性。
需要说明的是，可根据双壁围堰的实际应用情况设计双壁围堰包括一节、三节或更多节双壁围堰单元，且每节双壁围堰单元的高度也根据具体情况设置，在此不做具体限定。
参照如图1至图3所示，可选地，双壁围堰的水平截面为矩形。
在该实施例中，双壁围堰的水平截面为矩形，即整个双壁围堰呈方形围堰结构。具体地，双壁围堰的横桥向设计为28.6m，纵桥向设计为21.6m。
可选地，导向机构4的数量为多个，多个导向机构4分别与钻孔桩的护筒5相对应。
在该实施例中，参照图4所示，通过导向机构4的数量为多个，多个导向机构4分别与钻孔桩的护筒5相对应，能够保证外圈的钻孔桩的护筒5 至少有一个导向机构4与之对应起到导向作用。
具体地，导向机构4可以设置为12个，通过12个导向机构能够更好的保证围堰顺利下放。
在该实施例中，优选地，内面板11上的导向机构4沿竖直方向设置有上下两层，上下两层的导向机构4对应在同一竖直线上，从而在双壁围堰下放过程中能够起到两道导向定位作用，进一步保证了双壁围堰下放的精准度。
可选地，导向板42与护筒5外壁面的间距为4cm。
在该实施例中，参照图5和图6所示，设计导向板42与对应的护筒5外壁面之间的间距为4cm，经过现场实验证明，在此间距下既能够保证双壁围堰的顺利下放，导向板42又能够起到导向作用，保证双壁围堰的精准下放。
需要说明的是，现场可根据护筒的平面位置及垂直度调整导向板42长度及导向板42与对应的护筒外壁面之间的间距大小，以确保围堰下放顺利。另外，为保证导向的刚度，导向机构4的所有焊缝均满焊，焊缝高度需要至少为8mm，以保证焊缝质量。
可选地，参照图5和图6所示，连接杆41与壁体1内面板11的连接处还设置有加劲板43。
在该实施例中，为增强导向机构4与壁体1连接的稳固性，在连接杆41与壁体1内面板11的连接处还设置有加劲板43。
可选地，参照图7和图8所示，壁体1的内面板11和外面板12之间设置有吊耳6，吊耳6的数量可以为多个，多个吊耳6位于相同高度且绕双壁围堰的周向均匀设置。
为方便双壁围堰的吊装，在该实施例中，壁体1的内面板11和外面板 12之间设置有吊耳6，吊耳6的吊孔的轴线方向垂直于内面板11和外面板12，且吊孔贯穿内面板11和外面板12。在吊装时，向吊孔内插入销轴7，吊装装置通过与销轴7相连接，实现对双壁围堰的吊装。
具体地，吊耳6的数量为多个，多个吊耳6绕双壁围堰的周向均匀设置且位于相同高度，吊装时通过多个吊耳6同时对双壁围堰进行吊装，通过多个吊耳6能够更好的保证吊装的稳定性更好。优选地，吊耳6的数量设置为8个。
优选地，参照图7所示，吊耳6的结构包括底座板61和耳板62，耳板62设置于底板座上，可选地，耳板62与底座板61的连接处可以设置有加劲板43，进而能够增强吊耳6的强度。
具体地，吊耳6采用厚10mm的Q235B钢板焊接而成，吊耳6构件均为角焊缝，焊角高度不小于8mm，且焊缝至少为二级焊缝以上。底座板61与壁体1环板相焊接，确保受力点安全。
可选地，参照图1所示，壁体1的内面板11和外面板12之间设置有连通管8。
在该实施例中，为实现双壁围堰顺利吸泥下沉至设计位置，且保持围堰内外水压平衡，在壁体1的内面板11和外面板12之间可以设置有连通管8，连通管8连通围堰内外。
优选地，连通管8的数量为多个，多个连通管8均匀分布于围堰上，且。具体地，连通管8的数量为16个，且连通管8可以采用Φ300mm的钢管。
优选地，多个连通管8位于围堰上的相同高度处。
可选地，参照图1至图3所示，内支撑杆3的数量为多个，多个内支撑杆3沿竖直方向交叉间隔设置，将双壁围堰单元分隔成多层。
在该实施例中，每一双壁围堰单元的内支撑杆3的数量为多个，多个内支撑杆3沿竖直方向平行间隔垂直交叉设置，其中，多个内支撑杆3将双壁围堰单元分隔成多层，最底层的内支撑杆3为第一层内支撑杆3，依次向上分别为第二层内支撑杆3、第三层内支撑杆3等。通过设置多个沿竖直方向间隔设置的内支撑杆3，能够对双壁围堰起到多重支撑作用，使得双壁围堰在下放和施工过程中稳定性更好。
在本公开的一个实施例中，优选地，刃脚2高度150cm；双壁围堰内面板11和外面板12均采用6mm钢板，钢箱的内外面板12采用8mm钢板；面板背楞采用∠75×50×8角钢，标准间距30cm；面板背楞在内支撑位置处采用12.6型钢，间距为30cm；环向角钢采用2∠100×10；环板采用10mm钢板，拐角处钢箱环板采用12mm钢板，隔仓板采用10mm钢板。制作工艺必须保证其设计尺寸及焊缝质量，满足挡水结构的要求。
本公开的实施例还提供一种利用上述任一实施例的双壁围堰进行墩身施工方法，需要说明的是，由于本公开的双壁围堰可以应用于围堰施工处地质主要为淤泥质黏土及砂层，因此在施工中紧紧抓住围堰下沉的本质就是减少围堰壁与土体的摩阻力，使围堰能依靠自重(或所加配重)下沉到达设计位置，据此理念，在双壁钢围堰下沉前中采用以长臂挖掘机开挖取土为主，吸泥、射水、舱内配重等多种方式并用为辅的综合施工方法，加快施工进度，确保围堰下放精度。
具体地，包括以下步骤：
步骤100、在桩基施工完成后，拆除钻孔平台；
步骤200、双壁围堰单元分段在内场车间制作，包括下料、小组件装焊、壁板拼板、分段上胎制作成型，围堰工厂一体化制作；
双壁钢围堰运输采用两条驳船并行、拖轮拖行的方式进行运输，围堰 加工厂内由600t龙门吊分节吊装至平板驳船上，然后运输至桥位处；
步骤300、施工前首先进行现场准备，浮吊抛锚定位，利用600t浮吊吊装双壁围堰单元第一节，下沉围堰至自稳状态，浇筑刃脚混凝土；
步骤400、若双壁围堰单元为多节，利用浮吊吊装第二节双壁围堰单元与第一节双壁围堰单元进行拼接、焊接，组拼过程中确保焊缝质量；重复吊装，完成多节双壁围堰单元的拼接；
步骤500、通过长臂挖掘机挖土，配合空气吸泥机吸泥的下沉措施，使双壁围堰整体均匀下沉到设计位置，抛填片石及碎石找平层，浇筑封底混凝土；
步骤600、双壁围堰内抽水，然后拆除导向系统，割除钢护筒，凿桩头；
步骤700、绑扎承台钢筋，浇筑第一层承台混凝土，待其强度达到设计强度后，拆除第一层围堰内支撑杆，施工第二层承台；重复施工，完成整体墩身施工。
其中，在上述施工过程中，在底节双壁围堰单元吊装自浮稳定后，可以用砼灌注刃脚，配置成增大刃脚下沉过程中的刚度和强度，浇筑完刃脚混凝土围堰稳定后，安装接高平台及临时接高限位导向。接高导向可以采用10#槽钢间距50cm设置，而且安装接高平台的宽度可以为1.5m，走行平台采用直径16mm螺纹钢间距8cm焊接。临时接高限位导向采用双拼20工字钢设置，导向高出接口位置50cm，间距4-5m设置一处。
采用上述围堰结构和施工方法的优点至少包括：使用的设备除长臂挖掘机一般使用较少外，其他设备均为常用设备，且围堰原位拼装下沉占用的用地较少。围堰作为承台施工挡水结构，同时作为承台模板使用，为下道工序施工节省时间。
最后应说明的是：以上各实施例仅用以说明本公开的技术方案，而非 对其限制；尽管参照前述各实施例对本公开进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本公开各实施例技术方案的范围。
工业实用性
本公开实施例提供的一种双壁围堰的结构强度、稳定性高，止水效果好，结构设计合理，在施工过程中无需结构进行多次调整，保证工程的顺利进行。

Claims (19)

  1. 一种双壁围堰，其特征在于，包括至少一节双壁围堰单元，所述双壁围堰单元包括壁体、刃脚、内支撑杆和导向机构；
    所述刃脚设置于所述壁体底端，所述内支撑杆水平位于所述壁体内面板的内部，并与所述壁体的内面板相连接；所述导向机构包括连接杆和导向板，所述导向板通过所述连接杆与所述壁体内面板相连接，所述导向板的弯曲度与钻孔桩的护筒外壁面的曲率相适配，且所述导向板与所述护筒外壁面之间具有间距。
  2. 根据权利要求1所述的双壁围堰，其特征在于，所述壁体包括内面板和外面板；所述内面板和所述外面板之间通过连接结构固定连接。
  3. 根据权利要求1或2所述的双壁围堰，其特征在于，包括两节所述双壁围堰单元，两节所述双壁围堰单元竖向拼接。
  4. 根据权利要求1-3任一项所述的双壁围堰，其特征在于，所述双壁围堰的水平截面为矩形。
  5. 根据权利要求1-4任一项所述的双壁围堰，其特征在于，所述导向机构的数量为多个，多个所述导向机构分别与所述钻孔桩的护筒相对应。
  6. 根据权利要求5所述的双壁围堰，其特征在于，所述壁体的内面板上的所述导向机构沿竖直方向设置有两层，两层的所述导向机构对应在同一竖直线上。
  7. 根据权利要求1-6任一项所述的双壁围堰，其特征在于，所述导向板与所述护筒外壁面的间距为4cm。
  8. 根据权利要求1-7任一项所述的双壁围堰，其特征在于，所述连接杆与所述壁体内面板的连接处还设置有加劲板。
  9. 根据权利要求2-8任一项所述的双壁围堰，其特征在于，所述壁体 的内面板和外面板之间设置有吊耳，所述吊耳的数量为多个，多个所述吊耳位于相同高度且绕所述双壁围堰的周向均匀设置。
  10. 根据权利要求9所述的双壁围堰，其特征在于，所述吊耳的吊孔的轴线方向垂直于所述内面板和所述外面板，且所述吊孔贯穿所述内面板和所述外面板。
  11. 根据权利要求9或10所述的双壁围堰，其特征在于，所述吊耳包括底座板和耳板，所述耳板设置于所述底板座上，且所述耳板与所述底座板固定连接。
  12. 根据权利要求1-11任一项所述的双壁围堰，其特征在于，所述壁体的内面板和外面板之间设置有连通管。
  13. 根据权利要求12所述的双壁围堰，其特征在于，所述连通管的数量为多个，多个所述连通管均匀分布于围堰上，且多个所述连通管位于围堰上的高度相同。
  14. 根据权利要求1-13任一项所述的双壁围堰，其特征在于，所述内支撑杆的数量为多个，多个所述内支撑杆沿竖直方向交叉间隔设置，将所述双壁围堰单元分隔成多层。
  15. 根据权利要求2-14任一项所述的双壁围堰，其特征在于，所述壁体的内面板围设有内部空间，所述内支撑杆设置于所述壁体的内部空间内，且所述内支撑杆呈水平设置，且所述内支撑杆的两端分别与所述内面板连接。
  16. 一种利用权利要求1至16任一项所述的双壁围堰进行墩身施工方法，其特征在于，包括以下步骤：
    步骤100、在桩基施工完成后，拆除钻孔平台；
    步骤200、双壁围堰单元在船厂加工完成，吊装阶段内支撑杆安装完毕， 并将双壁围堰单元运输至桥位处；
    步骤300、利用浮吊吊装双壁围堰单元第一节，下沉围堰至自稳状态，浇筑刃脚混凝土；
    步骤400、若双壁围堰单元为多节，利用浮吊吊装第二节双壁围堰单元与第一节双壁围堰单元进行拼接，组拼过程中确保焊缝质量；重复吊装，完成多节双壁围堰单元的拼接；
    步骤500、通过长臂挖掘机挖土，配合空气吸泥机吸泥的下沉措施，使双壁围堰下沉到设计位置，抛填片石及碎石找平层，浇筑封底混凝土；
    步骤600、双壁围堰内抽水，然后拆除导向系统，割除钢护筒，凿桩头；
    步骤700、绑扎承台钢筋，浇筑第一层承台混凝土，待其强度达到设计强度后，拆除第一层围堰内支撑杆，施工第二层承台；重复施工，完成整体墩身施工。
  17. 根据权利要求16所述的墩身施工方法，其特征在于，步骤300还包括在底节双壁围堰单元吊装自浮稳定后，用砼灌注刃脚，浇筑完刃脚混凝土围堰稳定后，安装接高平台及临时接高限位导向。
  18. 根据权利要求17所述的墩身施工方法，其特征在于，所述接高导向采用槽钢间距50cm设置。
  19. 根据权利要求17或18所述的墩身施工方法，其特征在于，所述临时接高限位导向采用双拼工字钢设置。
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CN115233712A (zh) * 2022-08-25 2022-10-25 中交一公局集团有限公司 一种特大哑铃型双壁钢围堰和护筒群及其起吊浮运施工方法

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