CN111305227A - Prestressed string-stretching circular ring supporting system and deformation control method thereof - Google Patents
Prestressed string-stretching circular ring supporting system and deformation control method thereof Download PDFInfo
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- CN111305227A CN111305227A CN202010216802.1A CN202010216802A CN111305227A CN 111305227 A CN111305227 A CN 111305227A CN 202010216802 A CN202010216802 A CN 202010216802A CN 111305227 A CN111305227 A CN 111305227A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 239000004567 concrete Substances 0.000 claims description 6
- 230000001154 acute effect Effects 0.000 claims description 4
- 239000011178 precast concrete Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
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Classifications
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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
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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)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
- Rod-Shaped Construction Members (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a prestressed string-stretching ring support system and a deformation control method thereof, wherein the system comprises a ring support constructed in a foundation pit and a plurality of string-stretching wires arranged along the diameter direction of the ring support, the included angles between two adjacent string-stretching wires are the same, and a prestressed force applying device is arranged at least one intersection point of the string-stretching wires or the extension lines thereof and the ring support. According to the deformation control method, when the foundation pit deforms in a certain direction or a certain opposite direction to cause the annular supports to deform in the same direction, the prestress applied to the annular supports is adjusted through the prestress applying devices corresponding to the tension strings perpendicular to the deformation direction, so that the deformation of the annular supports is controlled. The invention can control the deformation of the prestressed string-stretching ring supporting system caused by the deformation of the foundation pit so as to protect facilities around the foundation pit.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a prestressed string-stretching circular ring supporting system and a deformation control method thereof.
Background
With the advance of urbanization, the demand for expanding the underground space of the existing building is increasing day by day. Such projects typically have excavation depths of tens of meters or even thirty meters, and the periphery of the project is close to facilities such as houses, businesses, municipal roads, subways, municipal pressure pipelines and the like. In order to ensure that deformation of peripheral facilities is controllable in the foundation pit construction process, deformation of a foundation pit supporting system must be strictly limited, and the following technical means are usually adopted for a supporting system in a foundation pit in the field:
1. the rigidity of the enclosure wall is increased, for example, the sectional area of the enclosure pile is increased, or an underground continuous wall with higher rigidity is adopted;
2. the inner support material with higher rigidity is adopted, such as high-strength concrete material which replaces a steel pipe, an H-shaped steel support and the like;
3. increasing the cross-sectional area of the inner support system;
4. and the vertical support distribution interval is reduced, and if a plurality of vertical inner support system modes are adopted to control the enclosure wall to calculate the calculated length.
The defects of the technical means are as follows:
(1) the cost of the enclosure system is greatly increased; the measures of increasing the rigidity of the enclosure wall, reducing the distribution interval of the vertical supports, increasing the section of the inner support and the like can increase the enclosure engineering quantity and increase the cost of the foundation pit;
(2) the project construction period is prolonged; the construction period is prolonged due to excessive engineering quantity, and higher requirements are put forward on flexible configuration of resources such as building materials, manpower, mechanical equipment and the like;
(3) the stiffness of the inner support is seriously attenuated along with the increase of the length of the inner support in a plane;
(4) a large amount of dust and sewage are generated in the construction process of the enclosure system, and meanwhile, a large amount of construction waste is difficult to recycle, so that the environment pollution is caused.
Disclosure of Invention
The invention aims to solve the technical problem of providing a prestressed string-stretching ring supporting system and a deformation control method thereof, so as to control the deformation of the prestressed string-stretching ring supporting system when a foundation pit deforms and protect facilities around the foundation pit.
In order to solve the technical problems, the technical scheme of the invention is as follows: a prestressed string-stretching ring supporting system comprises a ring support constructed in a foundation pit and a plurality of stretching strings arranged along the diameter direction of the ring support, included angles between every two adjacent stretching strings are the same, and a prestressed force applying device is arranged at least one intersection point of each stretching string or an extension line of each stretching string and the ring support.
Furthermore, the prestress string-stretching ring supporting system provided by the invention is characterized in that the prestress applying device is a jack.
Furthermore, according to the prestress string-stretching ring supporting system provided by the invention, the prestress applying device is an electric motor, and the electric motor is connected with the string-stretching ring through a lead screw.
Furthermore, in the prestressed string-stretching ring support system provided by the invention, the prestress applying device is arranged on the inner side or the outer side of the ring support or penetrates through the inner side and the outer side of the ring support.
Further, the prestressed string-stretching ring supporting system provided by the invention has the advantage that the string is a steel strand, a steel pipe, a steel bar or a combination thereof.
Furthermore, in the prestressed string-stretching ring supporting system provided by the invention, an included angle between two adjacent string-stretching rings is an acute angle.
Furthermore, according to the prestress string-stretching ring support system provided by the invention, a plurality of layers of strings are arranged in the radial direction of the ring support.
Furthermore, according to the prestressed string-stretching ring support system provided by the invention, the ring support is formed by pouring concrete in situ; or the ring support precast concrete is assembled; or the circular ring support is formed by assembling steel members.
Furthermore, the pre-stressed string-stretching ring support system provided by the invention has the advantage that the string penetrates through or does not penetrate through the ring support.
In order to solve the technical problems, the technical scheme of the invention is as follows: when the foundation pit deforms in a certain direction or a certain opposite direction to cause the deformation of the ring supports in the same direction, the prestress applied to the ring supports is adjusted through the prestress applying device corresponding to the string perpendicular to the deformation direction, so that the deformation of the ring supports is controlled.
Compared with the prior art, the prestress string-stretching ring support system and the deformation control method thereof are characterized in that the system is composed of a ring support and a plurality of string-stretching devices distributed in the diameter direction of the ring support, and at least one intersection point of the string-stretching devices and the ring support is provided with a prestress applying device, so that the prestress string-stretching ring support system has the effects of simple structure and low cost. The deformation control method adjusts the tension force of the tension string through the prestress applying device to adjust the prestress applied to the circular ring support so as to improve the rigidity of the circular ring support and keep the prestressed circular ring support system stable, and when the circular ring support deforms, the prestress applied to the circular ring support is adjusted through the prestress applying device corresponding to the tension string perpendicular to the deformation direction so as to control the deformation of the circular ring support, thereby controlling the deformation of the foundation pit and protecting the peripheral facilities of the foundation pit. According to the prestressed string-stretching ring supporting system and the deformation control method thereof, the rigidity of the enclosure wall does not need to be increased, the section size of the inner supporting system does not need to be increased, the vertical supporting distribution interval does not need to be reduced, a supporting material with higher rigidity does not need to be adopted, environmental pollution caused by the increased construction is avoided, and the prestressed string-stretching ring supporting system and the deformation control method thereof have the effects of simple structure, convenience in deformation control, energy conservation, environmental protection, low cost and short construction period.
Drawings
Fig. 1 to 5 are schematic top structural views of a prestressed string-tensioning ring support system;
FIG. 6 is a schematic side view of a prestressed string-stretching ring support system;
FIG. 7 is a schematic diagram of deformation control of the prestressed string-tensioning circular ring support system.
Shown in the figure: 100. the prestressed string-stretching circular ring support system comprises a prestressed string-stretching circular ring support system 110, a circular ring support 120, a string-stretching circular ring 130, a prestressed force applying device 200, a ground 300 and a foundation pit.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
referring to fig. 1 and 6, an embodiment of the present invention provides a prestressed string-stretching ring support system 100, including a ring support 110 constructed in a foundation pit 300, and a plurality of stretching strings 120 arranged along a diameter direction of the ring support 110, where an included angle between two adjacent stretching strings 120 is the same, and a prestressed force applying device 130 is arranged at least at an intersection point of the stretching strings 120 or an extension line thereof and the ring support 110.
The construction method of the prestressed string-stretching ring support system 100 of the embodiment of the invention is as follows:
step 101, constructing a circular ring support 110 in a foundation pit 300.
102, after the ring support 110 reaches the construction strength, arranging a string 120 on the ring support 110 along the diameter direction of the ring support 110 and with two ends intersecting with each other.
103, arranging a prestress applying device 130 at least one intersection point of the string 120 and the ring support 110.
And 104, adjusting the tensile force of the tension string 120 through the prestress applying device 130 to adjust the prestress applied to the ring support 110, so as to form the prestressed ring support system 100 in the foundation pit 300.
Of course, the prestressed string-tensioning ring support system 100 according to the embodiment of the present invention and the foundation pit enclosure disposed in the foundation pit 300 are disposed with a support structure and a method known in the art. For example, the ring support 110 is supported by a support rod with the underground continuous wall of the foundation pit enclosure. Namely, the prestressed string-stretching ring supporting system provided by the embodiment of the invention is used for cooperatively bearing external loads. In addition, the prestressed string-tensioning ring support system 100 of the embodiment of the invention is not limited to a rectangular foundation pit, and is more suitable for a circular foundation pit.
Referring to fig. 1 and 7, in the deformation control method of the prestressed tension string 120 circular ring support system 100 according to the embodiment of the present invention, when the foundation pit 300 deforms in a certain direction or a certain opposite direction to cause the circular ring supports 110 to deform in the same direction, the prestress applied to the circular ring supports 110 is adjusted by the prestress applying device 130 corresponding to the tension string 120 perpendicular to the deformation direction, so that the deformation of the circular ring supports 110 is controlled. For example, the diameter of the circular ring support 110 is flexible, and the deformation of the circular ring support is controlled by adjusting the tension of the tension string 120 by the prestress applying device 130 to make the diameter of the circular ring support 110 smaller or larger.
The prestressed string 120 ring support system 100 and the deformation control method thereof according to the embodiment of the present invention are composed of a ring support 110 and a plurality of string 120 distributed in the diameter direction of the ring support 110, and at least one intersection point of the string 120 and the ring support 110 is provided with a prestressed force applying device 130, so that the prestressed string 120 ring support system has the effects of simple structure and low cost. According to the deformation control method, the prestress applied to the ring support 110 is adjusted by adjusting the tensile force of the tension string 120 through the prestress applying device 130, so that the rigidity of the ring support 110 is improved, the prestressed ring support system 100 is kept stable, and when the ring support 110 deforms, the prestress applied to the ring support 110 is adjusted through the prestress applying device 130 corresponding to the tension string 120 perpendicular to the deformation direction, so that the deformation of the ring support 110 is controlled, the deformation of the foundation pit 300 is controlled, and peripheral facilities of the foundation pit 300 are protected. The prestressed string 120 circular ring supporting system 100 and the deformation control method thereof do not need to increase the rigidity of the enclosure wall, increase the section size of the internal supporting system, reduce the vertical supporting distribution interval, adopt supporting materials with higher rigidity, avoid environmental pollution caused by the increased construction, and have the effects of simple structure, convenient deformation control, energy conservation, environmental protection, low cost and short construction period.
Referring to fig. 7, taking a circular ring support 110 with a diameter of 100m as an example, the cross-sectional dimension of the circular ring is 1200mm × 800mm, the concrete strength grade is C35, a tension string is arranged in the circular ring support every 30 °, the tension force F of the tension string is designed to be 500kN, and the dimensional deformation is δ m. The radial stiffness coefficient k of the ring support 110 is calculated by finite element software (Abaqus) to be F/δ 1673.7 kN/m. The rigidity of the support system arranged by adopting the conventional concrete counter-support in the field is 1493.3kN/m, so that the overall rigidity of the prestressed tension string 120 circular ring support system 100 adopting the embodiment of the invention is improved by about 12 percent. Therefore, the bearing has the effects of strong rigidity, good integrity and capability of bearing eccentric load. The included angle between two adjacent string wires is the same, so that the deformation control precision of the circular ring support is improved. The tension force of the plurality of tension strings 120 is adjusted by the corresponding prestress applying device 130, so that the circular ring support 110 is uniformly stressed, and the purpose of uniformly and accurately controlling the deformation of the circular ring support 110 is achieved.
According to the pre-stressed string-tensioning 120 circular ring supporting system 100, under the condition of the same rigidity, the size of the supporting section of the pre-stressed string-tensioning circular ring supporting system is small, waste building garbage formed after the system is dismantled is few, and the system has the effects of energy conservation and environmental protection.
Referring to fig. 1, in the prestressed tension string 120 circular ring supporting system 100 according to the embodiment of the present invention, the prestressed force applying device 130 may be a jack. One end of the jack is connected with the ring support 110, and the other end is connected with the string 120. Wherein, the two ends of the jack refer to the ejecting end and the base. The jack is for example a hydraulic jack. When the prestress applying device 130 is a jack, it has the advantages of convenient installation, convenient control and stable adjustment.
Referring to fig. 1, in the circular ring support system 100 of the prestressed tension string 120 according to the embodiment of the present invention, the prestress applying device 130 is an electric motor, and the electric motor is connected to the tension string 120 through a lead screw. For example, one end of the string 120 is provided as a lead screw structure including a screw and a nut. For stable control, the motor may be a stepping motor.
Referring to fig. 2 to 4, in the prestressed tension string 120 circular ring support system 100 according to the embodiment of the present invention, the prestress applying device 130 is disposed inside, outside or penetrating inside and outside the circular ring support 110. Wherein the prestress applying unit 130 of fig. 2 is disposed inside the ring support 110. Wherein the prestressing force applying device 130 of fig. 3 is disposed outside the ring support 110. Wherein the prestress applying unit 130 of fig. 4 penetrates the inner and outer sides of the ring support 110. That is, the position relationship of the prestress applying unit 130 is set as long as the tension of the tension string 120 can be adjusted and applied to the circular ring support 110.
Referring to fig. 1 to 4, in the prestressed tension string 120 ring support system 100 according to the embodiment of the invention, the tension string 120 may penetrate through the ring support 110 and extend outside the ring support 110. Referring to fig. 5, the string 120 may be disposed inside the circular ring support 110 or penetrate the circular ring support 110 and does not extend outside the circular ring support 110. That is, the string 120 may or may not penetrate through the circular ring support 110, as long as the tension of the string 120 can be adjusted and applied to the circular ring support 110. Wherein, the string 120 can be a steel strand, a steel pipe, a steel bar or a combination thereof. The string 120 of the embodiment of the present invention is preferably a steel strand, which is a flexible material, and therefore has the advantages of convenient transportation, convenient adjustment and convenient installation.
Referring to fig. 1 to fig. 5, in the prestressed string 120 circular ring support system 100 provided in the embodiment of the present invention, an included angle between two adjacent string 120 is an acute angle. For example, 4 stretched strings, and two adjacent stretched strings form an acute angle of 30 degrees. However, the number of the tension strings in the embodiment of the invention is not limited to 4, and can be adjusted according to the environmental requirements.
Referring to fig. 6, in the prestressed tension string 120 circular ring support system 100 according to the embodiment of the present invention, the tension string 120 is provided with a plurality of layers in the radial direction of the circular ring support 110. The structure of each layer of string 120 may be the same or different. The deformation of the annular support 110 in different axial positions in the foundation pit 300 with different depths is controlled by the plurality of layers of string 120, so that the control precision is improved.
Referring to fig. 1, in the prestressed chord 120 circular ring support system 100 according to the embodiment of the present invention, the circular ring support 110 may be formed by casting concrete in situ. Referring to fig. 2 to 5, the ring support 110 may be assembled by precast concrete or steel members. The prefabricated concrete or steel member assembly has the effects of short construction period and construction progress improvement.
The present invention is not limited to the above-described embodiments, and various changes and modifications made within the scope of the claims of the present invention are within the scope of the present invention.
Claims (10)
1. The prestressed string-stretching ring support system is characterized by comprising a ring support constructed in a foundation pit and a plurality of stretching strings arranged along the diameter direction of the ring support, included angles between every two adjacent stretching strings are the same, and a prestressed force applying device is arranged at least one intersection point of each stretching string or an extension line of each stretching string and the ring support.
2. The prestressed string-tensioning ring support system as claimed in claim 1, wherein the prestress applying device is a jack.
3. The prestressed string-stretching ring support system as claimed in claim 1, wherein said prestress applying device is an electric motor, and said electric motor is connected with said stretching string by a lead screw.
4. The prestressed string-stretching ring support system as claimed in claim 1, wherein said prestressing force applying means is disposed inside, outside or penetrating inside and outside of said ring support.
5. The prestressed string-tensioning ring support system according to claim 1, wherein the string is a steel strand, a steel pipe, a steel bar or a combination thereof.
6. The prestressed string-stretching ring support system of claim 1, wherein the included angle between two adjacent string-stretching rings is acute.
7. The prestressed string-stretching ring support system of claim 1, wherein said stretching strings are provided in a plurality of layers in a radial direction of said ring support.
8. The prestressed string-tensioning ring support system as claimed in claim 1, wherein the ring support is formed by concrete cast-in-place; or the ring support precast concrete is assembled; or the circular ring support is formed by assembling steel members.
9. The prestressed string-tensioning ring support system according to claim 1, wherein the tensioning string penetrates or does not penetrate through the ring support.
10. A deformation control method of the prestressed string-stretching ring supporting system as claimed in any one of claims 1-9, wherein when the deformation of the foundation pit in a certain direction or a certain opposite direction causes the deformation of the ring support in the same direction, the prestress applied to the ring support is adjusted by the prestress applying device corresponding to the string perpendicular to the deformation direction, so that the deformation of the ring support is controlled.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010216802.1A CN111305227A (en) | 2020-03-25 | 2020-03-25 | Prestressed string-stretching circular ring supporting system and deformation control method thereof |
| CH000610/2022A CH718234B1 (en) | 2020-03-25 | 2020-08-06 | Prestressed circular tension belt support system and method for controlling deformation of the prestressed circular tension belt support system. |
| PCT/CN2020/107254 WO2021189751A1 (en) | 2020-03-25 | 2020-08-06 | Prestress string annular support system, and deformation control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010216802.1A CN111305227A (en) | 2020-03-25 | 2020-03-25 | Prestressed string-stretching circular ring supporting system and deformation control method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111305227A true CN111305227A (en) | 2020-06-19 |
Family
ID=71150285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010216802.1A Pending CN111305227A (en) | 2020-03-25 | 2020-03-25 | Prestressed string-stretching circular ring supporting system and deformation control method thereof |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN111305227A (en) |
| CH (1) | CH718234B1 (en) |
| WO (1) | WO2021189751A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111980025A (en) * | 2020-08-10 | 2020-11-24 | 中铁七局集团第三工程有限公司 | Deep basal pit major structure pours forming device |
| WO2021189751A1 (en) * | 2020-03-25 | 2021-09-30 | 上海建工二建集团有限公司 | Prestress string annular support system, and deformation control method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666095A (en) * | 2009-09-11 | 2010-03-10 | 朱奎 | Irregular foundation pit support and construction method |
| CN207794096U (en) * | 2017-11-30 | 2018-08-31 | 中铁十六局集团有限公司 | Drawknot device and inner bracing member for concrete filled steel tube inner bracing member |
| CN212294671U (en) * | 2020-03-25 | 2021-01-05 | 上海建工二建集团有限公司 | Prestressed string-stretching circular ring supporting system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4231614A1 (en) * | 1992-09-22 | 1994-03-24 | Emunds & Staudinger Gmbh & Co | Shoring device |
| CN101260671B (en) * | 2008-04-10 | 2010-06-02 | 王平 | Deep pit trussed-beam type inner support prestressed force applying method |
| CN102979101B (en) * | 2012-12-12 | 2015-08-19 | 上海强劲地基工程股份有限公司 | A kind of pattern foundation pit supporting structure reinforced concrete inner support with prestressing force loader |
| KR101587212B1 (en) * | 2015-07-20 | 2016-01-20 | 주식회사 금원건설 | Construction method for strut wale using prestressed beam |
| CN207392211U (en) * | 2017-11-03 | 2018-05-22 | 大成科创基础建设股份有限公司 | Assembled foundation pit pre-loaded support struts system |
| CN110185044B (en) * | 2019-06-17 | 2023-12-12 | 中铁上海设计院集团有限公司 | Foundation pit side wall stress adjustment system for deep unstable stratum |
| CN111305227A (en) * | 2020-03-25 | 2020-06-19 | 上海建工二建集团有限公司 | Prestressed string-stretching circular ring supporting system and deformation control method thereof |
-
2020
- 2020-03-25 CN CN202010216802.1A patent/CN111305227A/en active Pending
- 2020-08-06 WO PCT/CN2020/107254 patent/WO2021189751A1/en active Application Filing
- 2020-08-06 CH CH000610/2022A patent/CH718234B1/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101666095A (en) * | 2009-09-11 | 2010-03-10 | 朱奎 | Irregular foundation pit support and construction method |
| CN207794096U (en) * | 2017-11-30 | 2018-08-31 | 中铁十六局集团有限公司 | Drawknot device and inner bracing member for concrete filled steel tube inner bracing member |
| CN212294671U (en) * | 2020-03-25 | 2021-01-05 | 上海建工二建集团有限公司 | Prestressed string-stretching circular ring supporting system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021189751A1 (en) * | 2020-03-25 | 2021-09-30 | 上海建工二建集团有限公司 | Prestress string annular support system, and deformation control method thereof |
| CN111980025A (en) * | 2020-08-10 | 2020-11-24 | 中铁七局集团第三工程有限公司 | Deep basal pit major structure pours forming device |
Also Published As
| Publication number | Publication date |
|---|---|
| CH718234B1 (en) | 2023-11-15 |
| WO2021189751A1 (en) | 2021-09-30 |
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