WO2021189751A1 - 预应力张弦圆环支撑体系及其变形控制方法 - Google Patents

预应力张弦圆环支撑体系及其变形控制方法 Download PDF

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Publication number
WO2021189751A1
WO2021189751A1 PCT/CN2020/107254 CN2020107254W WO2021189751A1 WO 2021189751 A1 WO2021189751 A1 WO 2021189751A1 CN 2020107254 W CN2020107254 W CN 2020107254W WO 2021189751 A1 WO2021189751 A1 WO 2021189751A1
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Prior art keywords
ring support
string
support system
deformation
stressed
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PCT/CN2020/107254
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English (en)
French (fr)
Inventor
于亚磊
龙莉波
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上海建工二建集团有限公司
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Priority to CH000610/2022A priority Critical patent/CH718234B1/de
Publication of WO2021189751A1 publication Critical patent/WO2021189751A1/zh

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/02—Foundation pits
    • E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/06—Foundation trenches ditches or narrow shafts
    • E02D17/08—Bordering or stiffening the sides of ditches trenches or narrow shafts for foundations
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/0046—Production methods using prestressing techniques

Definitions

  • the invention relates to the technical field of construction engineering, in particular to a prestressed string ring support system and a deformation control method thereof.
  • the technical problem to be solved by the present invention is to provide a prestressed string ring support system and a deformation control method thereof, so as to control the deformation of the prestressed string ring support system when the foundation pit is deformed, and protect the surrounding facilities of the foundation pit.
  • a pre-stressed string ring support system including a ring support constructed in the foundation pit, and a string set along the diameter direction of the ring support.
  • a string set along the diameter direction of the ring support There are multiple strings, the included angles between two adjacent open strings are the same, and at least one intersection point of the open string or its extension line and the ring support is provided with a prestressing device.
  • the prestress applying device is a jack.
  • the pre-stress applying device is a motor, and the motor is connected to the string through a screw.
  • the prestressing device is arranged on the inner side, the outer side of the ring support, or penetrates the inner and outer sides of the ring support.
  • the string is steel strand, steel pipe, steel bar or a combination thereof.
  • the included angle between two adjacent strings is an acute angle.
  • the stringed ring is provided with multiple layers in the radial direction of the ring support.
  • the ring support is formed by pouring concrete on site; or the ring support is assembled by precast concrete; or the ring support is assembled by steel members .
  • the stringed string penetrates or does not penetrate the ring support.
  • the technical solution of the present invention is: a deformation control method of the prestressed stringed ring support system as described above.
  • the foundation pit is deformed in a certain direction or a certain relative direction, the ring support occurs in the same direction.
  • the prestress applied on the ring support is adjusted by the prestressing device corresponding to the opening of the string perpendicular to the deformation direction, so that the deformation of the ring support is controlled.
  • the prestressed stringed ring support system of the present invention and its deformation control method are composed of ring supports and a plurality of stringed strings distributed in the diameter direction of the ring support. At least one intersection point is configured with a prestressing device, which has the effects of simple structure and low cost.
  • the deformation control method adjusts the tension force of the string through the prestressing device to adjust the prestress applied on the ring support, so as to improve the stiffness of the ring support, and keep the prestressed ring support system stable.
  • the prestress applied to the ring support is adjusted by the prestressing device corresponding to the string perpendicular to the deformation direction, so that the deformation of the ring support is controlled, so as to control the deformation of the foundation pit and protect Facilities around the foundation pit.
  • the prestressed string ring support system and its deformation control method of the present invention do not need to increase the rigidity of the retaining wall, do not need to increase the cross-sectional size of the internal support system, do not need to reduce the vertical support distribution spacing, and do not need to adopt greater rigidity
  • the supporting material will not cause environmental pollution due to the increased construction mentioned above, and has the effects of simple structure, convenient deformation control, energy saving and environmental protection, low cost, and short construction period.
  • Figures 1 to 5 are schematic diagrams of the top view structure of the prestressed string ring support system
  • Figure 6 is a schematic side view of the structure of the prestressed string ring support system
  • Figure 7 is a schematic diagram of the principle of deformation control of the prestressed string ring support system.
  • an embodiment of the present invention provides a pre-stressed string ring support system 100, including a ring support 110 constructed in the foundation pit 300, and the ring support 110 arranged along the diameter direction of the tension String 120, there are multiple open strings 120, the included angle between two adjacent open strings 120 is the same, and at least one intersection point of the open string 120 or its extension line and the ring support 110 is set There is a prestressing device 130.
  • the construction method of the prestressed string ring support system 100 of the embodiment of the present invention is as follows:
  • step 101 a circular support 110 is constructed in the foundation pit 300.
  • Step 102 After the ring support 110 reaches the construction strength, a string 120 is set on the ring support 110 along the diameter direction of the ring support 110 and the two ends intersect.
  • a prestressing device 130 is set at at least one intersection point of the tension string 120 and the ring support 110.
  • step 104 the tension force of the string 120 is adjusted by the prestressing device 130 to adjust the prestress applied on the ring support 110 to form the prestressed ring support system 100 in the foundation pit 300.
  • the pre-stressed string ring support system 100 of the embodiment of the present invention is provided between the pre-stressed string ring support system 100 of the embodiment of the present invention and the foundation pit enclosure provided in the foundation pit 300.
  • the ring support 110 and the underground continuous wall enclosed by the foundation pit are supported by support rods. That is, the pre-stressed string ring support system of the embodiment of the present invention cooperatively bears the external load.
  • the pre-stressed string ring support system 100 of the embodiment of the present invention is not limited to rectangular foundation pits, and is more suitable for circular foundation pits.
  • the deformation control method of the prestressed string 120 ring support system 100 when the foundation pit 300 is deformed in a certain direction or a certain relative direction, the ring support 110 is in the same direction
  • the prestressing device 130 corresponding to the string 120 perpendicular to the deformation direction adjusts the prestress applied to the ring support 110 so that the deformation of the ring support 110 can be controlled.
  • the diameter of the ring support 110 is plastic, and the prestressing device 130 adjusts the tension of the string 120 to make the diameter of the ring support 110 smaller or larger, so that the deformation of the ring support can be controlled.
  • the pre-stressed string 120 ring support system 100 and its deformation control method are composed of a ring support 110 and a plurality of stringers 120 distributed in the diameter direction of the ring support 110. At least one intersection of the ring support 110 is configured with a prestressing device 130, which has the effect of simple structure and low cost.
  • the tension force of the tension string 120 is adjusted by the prestressing device 130 to adjust the prestress applied to the ring support 110, so as to improve the rigidity of the ring support 110 and keep the prestressed ring support system 100 stable.
  • the prestressing device 130 corresponding to the string 120 perpendicular to the deformation direction adjusts the prestress applied to the ring support 110 so that the deformation of the ring support 110 can be controlled , So as to control the deformation of the foundation pit 300 and protect the surrounding facilities of the foundation pit 300.
  • the prestressed string 120 toroidal support system 100 and its deformation control method in the embodiment of the present invention do not need to increase the rigidity of the retaining wall, the cross-sectional size of the internal support system does not need to be increased, and the vertical support distribution spacing does not need to be reduced. There is no need to use support materials with greater rigidity, and there is no environmental pollution caused by the increase in the above-mentioned construction, and it has the effects of simple structure, convenient deformation control, energy saving and environmental protection, low cost, and short construction period.
  • the cross section size of the ring is 1200mm ⁇ 800mm
  • the concrete strength grade is C35
  • a string is set every 30° in the ring support
  • the tensile force F of the designed string is 500kN
  • the size deformation is ⁇ m.
  • the rigidity of the conventional concrete bracing arrangement support system in the field is 1493.3 kN/m. It can be seen that the overall rigidity of the prestressed string 120 ring support system 100 according to the embodiment of the present invention is increased by about 12%.
  • the included angle between two adjacent open strings is the same in order to improve the deformation control accuracy of the ring support.
  • the tension force of the multiple tension strings 120 is adjusted by the corresponding prestressing device 130, so that the ring support 110 is uniformly stressed, and the purpose of balancing and accurately controlling the deformation of the ring support 110 is achieved.
  • the support cross-section of the pre-stressed ring support system is small, and there is less waste construction waste after dismantling, which has the effect of energy saving and environmental protection.
  • a prestressed string 120 toroidal support system 100 is provided, and the prestressing device 130 may be a jack.
  • One end of the jack is connected to the ring support 110, and the other end is connected to the string 120.
  • the two ends of the jack refer to the ejector end and the base.
  • the jack is, for example, a hydraulic jack.
  • an embodiment of the present invention provides a pre-stressed string 120 toroidal support system 100.
  • the pre-stress applying device 130 is a motor, and the motor is connected to the string 120 through a screw.
  • one end of the tension string 120 is configured as a screw structure, which includes a screw and a nut.
  • the motor can be a stepping motor.
  • an embodiment of the present invention provides a prestressed string 120 toroidal support system 100.
  • the prestressing device 130 is arranged on the inner side, outer side of the toroidal support 110, or penetrates through the ring.
  • the ring supports 110 inside and outside.
  • the pre-stressing device 130 in FIG. 2 is arranged on the inner side of the ring support 110.
  • the prestressing device 130 in FIG. 3 is arranged on the outer side of the ring support 110.
  • the prestressing device 130 in FIG. 4 penetrates the inner and outer sides of the ring support 110. In other words, the positional relationship setting of the prestressing device 130 only needs to be able to adjust the tension of the string 120 and apply it to the ring support 110.
  • the string 120 can penetrate through the ring support 110 and extend outside the ring support 110.
  • the opening string 120 may be arranged on the inner side of the ring support 110 or penetrate the ring support 110 and not extend to the outer side of the ring support 110. That is, the opening string 120 may or may not penetrate the ring support 110, as long as the tensioning force of the opening string 120 can be adjusted and applied to the ring support 110.
  • the string 120 may be a steel strand, a steel pipe, a steel bar, or a combination thereof.
  • the tensioning string 120 in the embodiment of the present invention is preferably a steel strand. Because it is a soft and bendable material, it has the advantages of convenient handling, convenient adjustment, and convenient installation.
  • the angle between two adjacent strings 120 is an acute angle.
  • the number of strings in the embodiment of the present invention is not limited to 4, and can be adjusted according to environmental requirements.
  • an embodiment of the present invention provides a pre-stressed tension string 120 toroidal support system 100, the tension string 120 is provided with multiple layers in the radial direction of the toroidal support 110.
  • the structure of each layer of strings 120 may be the same or different.
  • the multi-layer stringing 120 controls the deformation of the annular support 110 located in the foundation pit 300 at different depths at different positions in the axial direction, so as to improve the control accuracy.
  • an embodiment of the present invention provides a pre-stressed string 120 toroidal support system 100.
  • the toroidal support 110 may be cast on-site concrete. Please refer to FIGS. 2 to 5.
  • the ring support 110 may be assembled from precast concrete or steel members. The use of precast concrete or steel components to assemble has the effect of short construction period and improving construction progress.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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Abstract

本发明公开了一种预应力张弦圆环支撑体系及其变形控制方法，该体系包括施工在基坑内的圆环支撑，以及沿所述圆环支撑的直径方向设置的张弦，所述张弦为多条，相邻两条所述张弦之间的夹角相同，所述张弦或者其延长线与所述圆环支撑的至少一个相交点设置有预应力施加装置。该变形控制方法，当基坑在某一方向或者某相对方向发生变形导致圆环支撑在相同方向发生变形时，通过垂直于变形方向的所述张弦对应的预应力施加装置调节施加在圆环支撑上的预应力，以使圆环支撑的变形得到控制。本发明能够在基坑变形导致预应力张弦圆环支撑体系变形时进行控制，以保护基坑周边设施。

Description

预应力张弦圆环支撑体系及其变形控制方法 技术领域
本发明涉及建筑工程技术领域，特别涉及一种预应力张弦圆环支撑体系及其变形控制方法。
背景技术
随着城市化的推进，既有建筑地下空间拓展需求日益增多。此类项目通常基坑开挖深度深达十几米甚至三十米，且项目周边紧邻住宅、商业、市政道路、地铁、市政有压管线等设施。为确保基坑施工过程中对周边设施变形可控，必须严格限制基坑支护体系变形，本领域中基坑内的支撑体系常采用如下技术手段：
1、增大围护墙刚度，如增大围护桩截面积，或采用刚度较大的地下连续墙等；
2、采用刚度较大内支撑材料，如采用高强砼材料替代钢管、H型钢支撑等；
3、增大内支撑体系截面面积；
4、减小竖向支撑分布间距，如采用多道竖向内支撑体系方式控制围护墙计算计算长度。
上述技术手段的缺陷如下:
(1)、围护体系造价剧增；增大围护墙刚度、减小竖向支撑分布间距、增大内支撑截面等措施会增大围护工程量，增加基坑造价；
(2)、工程工期延长；过大的工程量增长工期，且对建筑材料、人力、机械设备等资源的灵活配置提出更高要求；
(3)、内支撑刚度随平面内支撑长度增加而严重衰减；
(4)、围护体系施工过程会产生大量粉尘、污水，同时大量建筑垃圾难以被循环利用造成环境污染。
发明内容
本发明所要解决的技术问题是，提供一种预应力张弦圆环支撑体系及其变形控制方法，以在基坑变形时对预应力张弦圆环支撑体系的变形进行控制，保护基坑周边设施。
为了解决上述技术问题，本发明的技术方案是：一种预应力张弦圆环支撑体系，包括施工在基坑内的圆环支撑，以及沿所述圆环支撑的直径方向设置的张弦，所述张弦为多条，相邻两条所述张弦之间的夹角相同，所述张弦或者其延长线与所述圆环支撑的至少一个相交点设置有预应力施加装置。
进一步地，本发明提供的预应力张弦圆环支撑体系，所述预应力施加装置为千斤顶。
进一步地，本发明提供的预应力张弦圆环支撑体系，所述预应力施加装置为电动机，所述电动机通过丝杠与所述张弦连接。
进一步地，本发明提供的预应力张弦圆环支撑体系，所述预应力施加装置设置于所述圆环支撑的内侧、外侧或者贯穿于所述圆环支撑的内外侧。
进一步地，本发明提供的预应力张弦圆环支撑体系，所述张弦为钢绞线、钢管、钢筋或者其组合。
进一步地，本发明提供的预应力张弦圆环支撑体系，相邻两条所述张弦之间的夹角为锐角。
进一步地，本发明提供的预应力张弦圆环支撑体系，所述张弦在所述圆环支撑的径向方向上设置有多层。
进一步地，本发明提供的预应力张弦圆环支撑体系，所述圆环支撑为混凝土现场浇筑而成；或者所述圆环支撑预制混凝土拼装而成；或者所述圆环支撑为钢构件拼装而成。
进一步地，本发明提供的预应力张弦圆环支撑体系，所述张弦贯穿于或者不贯穿于圆环支撑。
为了解决上述技术问题，本发明的技术方案是：一种如上述的预应力张弦圆环支撑体系的变形控制方法，当基坑在某一方向或者某相对方向发生变形导致圆环支撑在相同方向发生变形时，通过垂直于变形方向的所述张弦对应的预应力施加装置调节施加在圆环支撑上的预应力，以使圆环支撑的变形得到控制。
与现有技术相比，本发明的预应力张弦圆环支撑体系及其变形控制方法，该体系由圆环支撑以及分布在圆环支撑直径方向的多条张弦构成，张弦与圆环支撑的至少一个相交点设置有预应力施加装置构成，具有结构简单、成本低的效果。该变形控制方法通过预应力施加装置调节张弦的张拉力以调节施加在圆环支撑上的预应力，以提高圆环支撑的刚度，使预应力圆环支撑体系保持稳定，在圆环支撑在发生变形时，通过垂直于变形方向的所述张弦对应的预应力施加装置调节施加在圆环支撑上的预应力，以使圆环支撑的变形得到控制，从而对基坑变形进行控制，保护基坑周边设施。本发明的预应力张弦圆环支撑体系及其变形控制方法，不需要增大围护墙刚度，不需要增大内支撑体系截面尺寸，不需要减小竖向支撑分布间距，不需要采用刚度较大的支撑材料，不会由于增加的上述施工而导致的环境污染，具有结构简单、变形控制方便、节能环保、成本低、施工周期短的效果。
附图说明
图1至图5是预应力张弦圆环支撑体系的俯视结构示意图；
图6是预应力张弦圆环支撑体系的侧视结构示意图；
图7是预应力张弦圆环支撑体系的变形控制的原理示意图。
图中所示：100、预应力张弦圆环支撑体系，110、圆环支撑，120、张弦，130、预应力施加装置，200、地，300、基坑。
具体实施方式
下面结合附图对本发明作详细描述：
请参考图1和图6，本发明实施例提供一种预应力张弦圆环支撑体系100，包括施工在基坑300内的圆环支撑110，以及沿所述圆环支撑110的直径方向设置的张弦120，所述张弦120为多条，相邻两条所述张弦120之间的夹角相同，所述张弦120或者其延长线与所述圆环支撑110的至少一个相交点设置有预应力施加装置130。
本发明实施例的预应力张弦圆环支撑体系100的施工方法如下：
步骤101，在基坑300内施工圆环支撑110。
步骤102，待圆环支撑110达到施工强度后，沿所述圆环支撑110的直径方向且两端相交于所述圆环支撑110上设置张弦120。
步骤103，在所述张弦120与圆环支撑110的至少一个相交点设置预应力施加装置130。
步骤104，通过预应力施加装置130调节张弦120的张拉力以调节施加在圆环支撑110上的预应力，以在基坑300内形成预应力圆环支撑体系100。
当然，本发明实施例的预应力张弦圆环支撑体系100与设置在基坑300内的基坑围护之间设置有本领域公知的支撑结构和方法。例如圆环支撑110与基坑围护的地下连续墙之间通过支撑杆支撑。即本发明实施例的预应力张弦圆环支撑体系协同承担外部荷载。另外，本发明实施例的预应力张弦圆环支撑体系100不限于矩形基坑，更适应于圆形基坑。
请参考图1和图7，本发明实施例的预应力张弦120圆环支撑体系100的变形控制方法，当基坑300在某一方向或者某相对方向发生变形导致圆环支撑110在相同方向发生变形时，通过垂直于变形方向的所述张弦120对应的预应力施加装置130调节施加在圆环支撑110上的预应力，以使圆环支撑110的变形得到控制。例如圆环支撑110的直径尺寸具有可塑性，通过预应力施加装置130调节张弦120的张拉力使圆环支撑110的直径尺寸变小或者变大的方式，使圆环支撑的变形得到控制。
本发明实施例的预应力张弦120圆环支撑体系100及其变形控制方法，该体系由圆环支撑110以及分布在圆环支撑110直径方向的多条张弦120构成，张弦120与圆环支撑110的至少一个相交点设置有预应力施加装置130构成，具有结构简单、成本低的效果。该变形控制方法通过预应力施加装置130调节张弦120的张拉力以调节施加在圆环支撑110上的预应力，以提高圆环支撑110的刚度，使预应力圆环支撑体系100保持稳定，在圆环支撑110在发生变形时，通过垂直于变形方向的所述张弦120对应的预应力施加装置130调节施加在圆环支撑110上的预应力，以使圆环支撑110的变形得到控制，从而对基坑300变形进行控制，保护基坑300周边设施。本发明实施例的预应力张弦120圆环支撑体系100及其变形控制方法，不需要增大围护墙刚度，不需要增大内支撑体系截面尺寸，不需要减小竖向支撑分布间距，不需要采用刚度较大的支撑材 料，不会由于增加的上述施工而导致的环境污染，具有结构简单、变形控制方便、节能环保、成本低、施工周期短的效果。
请参考图7，以直径为100m圆环支撑110为例，圆环截面尺寸1200mm×800mm，混凝土强度等级C35，圆环支撑内每30°设一道张弦，设计张弦的张拉力F为500kN，尺寸变形为δm。经有限元软件(Abaqus)计算，得出圆环支撑110的径向劲度系数k＝F/δ＝1673.7kN/m。而采用本领域常规混凝土对撑布置支撑体系，其刚度为1493.3kN/m，由此可知，采用本发明实施例的预应力张弦120圆环支撑体系100，其整体刚度提升约12％。因此具有刚度强、整体性好，可承担偏心荷载的效果。其中相邻两条所述张弦之间的夹角相同，是为了提高圆环支撑的变形控制精度。通过相应的预应力施加装置130对多条张弦120的张拉力进行调节，使圆环支撑110均匀受力，达到均衡并精确控制圆环支撑110变形的目的。
本发明实施例的预应力张弦120圆环支撑体系100，在同等刚度条件下，预应力张弦圆环支撑体系的支撑截面尺寸小，拆除后形成废弃建筑垃圾少，具有节能环保的效果。
请参考图1，本发明实施例提供的预应力张弦120圆环支撑体系100，所述预应力施加装置130可以为千斤顶。千斤顶一端与圆环支撑110连接，另一端与张弦120连接。其中千斤顶的两端是指顶出端和底座。千斤顶例如为液压千斤顶。预应力施加装置130为千斤顶时，具有安装方便、控制方便、调节稳定的优点。
请参考图1，本发明实施例提供的预应力张弦120圆环支撑体系100，所述预应力施加装置130为电动机，所述电动机通过丝杠与所述张弦120连接。例如张弦120的一端设置为丝杠结构，包括螺杆和螺母。为稳定控制，电动机可以采用步进电机。
请参考图2至图4，本发明实施例提供的预应力张弦120圆环支撑体系100，所述预应力施加装置130设置于所述圆环支撑110的内侧、外侧或者贯穿于所述圆环支撑110的内外侧。其中图2中的预应力施加装置130设置于所述圆环支撑110的内侧。其中图3中的预应力施加装置130设置于所述圆环支撑110的外侧。其中图4中的预应力施加装置130贯穿于圆环支撑110的内外侧。也 就是说，预应力施加装置130的位置关系设定只要能够实现对张弦120的张拉力进行调节并施加到圆环支撑110上即可。
请参考图1至图4，本发明实施例的预应力张弦120圆环支撑体系100，张弦120可以贯穿于圆环支撑110并且延伸于圆环支撑110的外侧。请参考图5，张弦120可以设置于圆环支撑110的内侧或者贯穿于圆环支撑110并且不延伸到圆环支撑110的外侧。即张弦120可以贯穿于或者不贯穿于圆环支撑110，只要能够实现对张弦120的张拉力进行调节并施加到圆环支撑110上即可。其中，张弦120可以为钢绞线、钢管、钢筋或者其组合。本发明实施例的张弦120优选为钢绞线，由于其为软性可弯曲材料，其具有搬运方便、调整方便、安装方便的优点。
请参考图1至图5，本发明实施例提供的预应力张弦120圆环支撑体系100，相邻两条所述张弦120之间的夹角为锐角。例如为4条张弦，相邻两条张弦构成30度的锐角。但本发明实施例中的张弦的条数不限于4条，可以根据环境需求进行调整。
请参考图6，本发明实施例提供的预应力张弦120圆环支撑体系100，所述张弦120在所述圆环支撑110的径向方向上设置有多层。每层张弦120的结构可以相同，也可以不相同。通过多层张弦120对位于不同深度基坑300内的圆环支撑110在轴向不同位置的变形进行控制，以提高控制精度。
请参考图1，本发明实施例提供的预应力张弦120圆环支撑体系100，所述圆环支撑110可以为混凝土现场浇筑而成。请参考图2至图5所述圆环支撑110可以为预制混凝土拼装而成，也可以为钢构件拼装而成。采用预制混凝土或者钢构件拼装具有施工周期短、提高施工进度的效果。
本发明不限于上述具体实施例，凡在本发明的权利要求书内所作出的各种变化和润饰，均在本发明的保护范围之内。

Claims (10)

  1. 一种预应力张弦圆环支撑体系，其特征在于，包括施工在基坑内的圆环支撑，以及沿所述圆环支撑的直径方向设置的张弦，所述张弦为多条，相邻两条所述张弦之间的夹角相同，所述张弦或者其延长线与所述圆环支撑的至少一个相交点设置有预应力施加装置。
  2. 如权利要求1所述的预应力张弦圆环支撑体系，其特征在于，所述预应力施加装置为千斤顶。
  3. 如权利要求1所述的预应力张弦圆环支撑体系，其特征在于，所述预应力施加装置为电动机，所述电动机通过丝杠与所述张弦连接。
  4. 如权利要求1所述的预应力张弦圆环支撑体系，其特征在于，所述预应力施加装置设置于所述圆环支撑的内侧、外侧或者贯穿于所述圆环支撑的内外侧。
  5. 如权利要求1所述的预应力张弦圆环支撑体系，其特征在于，所述张弦为钢绞线、钢管、钢筋或者其组合。
  6. 如权利要求1所述的预应力张弦圆环支撑体系，其特征在于，相邻两条所述张弦之间的夹角为锐角。
  7. 如权利要求1所述的预应力张弦圆环支撑体系，其特征在于，所述张弦在所述圆环支撑的径向方向上设置有多层。
  8. 如权利要求1所述的预应力张弦圆环支撑体系，其特征在于，所述圆环支撑为混凝土现场浇筑而成；或者所述圆环支撑预制混凝土拼装而成；或者所述圆环支撑为钢构件拼装而成。
  9. 如权利要求1所述的预应力张弦圆环支撑体系，其特征在于，所述张弦贯穿于或者不贯穿于圆环支撑。
  10. 一种如权利要求1-9中任一项所述的预应力张弦圆环支撑体系的变形控制方法，其特征在于，当基坑在某一方向或者某相对方向发生变形导致圆环支撑在相同方向发生变形时，通过垂直于变形方向的所述张弦对应的预应力施加装置调节施加在圆环支撑上的预应力，以使圆环支撑的变形得到控制。
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