CN112376636B - Reinforcing construction method for increasing cross section of outer wall based on existing basement structure - Google Patents
Reinforcing construction method for increasing cross section of outer wall based on existing basement structure Download PDFInfo
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- CN112376636B CN112376636B CN202011111755.0A CN202011111755A CN112376636B CN 112376636 B CN112376636 B CN 112376636B CN 202011111755 A CN202011111755 A CN 202011111755A CN 112376636 B CN112376636 B CN 112376636B
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- 238000010276 construction Methods 0.000 title claims abstract description 37
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 16
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 22
- 230000008569 process Effects 0.000 claims description 7
- 230000008093 supporting effect Effects 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 238000009412 basement excavation Methods 0.000 abstract description 2
- 238000009435 building construction Methods 0.000 abstract description 2
- 238000009415 formwork Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G23/0222—Replacing or adding wall ties
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/20—Miscellaneous comprising details of connection between elements
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- Engineering & Computer Science (AREA)
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- Structural Engineering (AREA)
- Civil Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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- Mechanical Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a construction method for reinforcing an outer wall with an enlarged section based on an existing basement structure, belongs to the field of building construction, and is characterized in that a floor slab of the original structure of a basement is reserved, only concrete at the joint of the floor slab of the original structure and a thickened outer wall to be constructed is removed, and reinforcing steel bars of the floor slab of the original structure are reserved. When the basement outer wall section is thickened, the floor slab serves as an inner support of the original structure outer wall, the original structure outer wall serves as an outer support, the original structure is well kept, the bearing performance of the existing structure is fully exerted, meanwhile, the earth excavation is not carried out, and the influence on the surrounding environment is small. The invention can ensure the continuous construction of the node and improve the construction quality of the node. And need not to do in addition and support, save the expense, shorten the time limit for a project.
Description
Technical Field
The invention relates to the field of building construction, in particular to a reinforcing construction method for an outer wall with an enlarged section based on an existing basement structure.
Background
The underground structure of the city core section is an indispensable part of city business cards, but the construction time is long, and the function is often greatly limited during planning and designing, so that the maintenance of the external outline of the underground structure and the internal upgrading and reconstruction of the underground structure become important means for relieving the shortage of city resources and adapting to the high-speed development of cities.
In the structural transformation process, the original structure is partially overlapped and collided with the spatial position of a new structural system, the establishment of the new structural system is influenced, if the problem cannot be solved smoothly, great potential safety hazards are generated on a newly-built bearing system, and the structural safety is influenced.
Disclosure of Invention
The invention aims to provide a reinforcing construction method for increasing a section of an outer wall based on an existing basement structure, and the reinforcing construction method is used for solving the technical problem that the construction of a new structure system is influenced by the collision of a new structure and an old structure in the structure transformation process.
In order to solve the technical problem, the invention provides a construction method for reinforcing an enlarged section of an outer wall based on an existing basement structure, which comprises the following steps:
step one, determining the construction range, the section thickness and the height of a thickened outer wall to be constructed;
secondly, dividing the thickened outer wall to be constructed into bin sections along the horizontal direction;
thirdly, constructing the thickened outer wall layer by layer from bottom to top according to the selected bin section, removing concrete at the joint of the original structural floor slab on the upper layer and the thickened outer wall to be constructed to form a concrete removing area, wherein the width of the concrete removing area is equal to the section thickness of the thickened outer wall, and retaining reinforcing steel bars of the original structural floor slab;
binding the thickened outer wall steel bars on the layer, enabling the vertical steel bars of the thickened outer wall steel bars to penetrate through the concrete removing area of the original structural floor slab on the upper layer, and reserving the length connected with the thickened outer wall steel bars on the upper layer;
fifthly, embedding a ground anchor counter-pulling screw rod in the thickened outer wall to be constructed, wherein the bottom end of the ground anchor counter-pulling screw rod is connected with a steel bar in the outer wall of the original structure;
supporting a template and a template support on the inner side single face of the thickened outer wall to be constructed, and connecting the top end of the ground anchor counter-pulling screw with the template support;
seventhly, pouring concrete of the thickened outer wall of the layer among the original structure outer wall, the template, the original structure floor of the layer and the original structure floor of the upper layer;
eighthly, pouring concrete in a concrete removing area of the original structural floor slab on the upper layer;
step nine, repeating the step three to the step eight, and finishing the construction of the thickened outer wall of the bin section;
and step ten, repeating the step two to the step nine to finish the construction of the thickened outer wall of all the bin sections.
Preferably, the width of the thickened outer wall to be constructed of each bin section in the second step is the same as the interval between two adjacent original structural beams.
Preferably, in the third step, the bin section is selected by adopting a bin skipping method.
Preferably, when the external wall steel bars are thickened in the fourth step and meet the original structural beam in the binding process, the external wall steel bars are disconnected at the original structural beam, and reinforcing steel bars are arranged on the periphery of the original structural beam.
Preferably, in the step eight, a mould hanging method is adopted to pour concrete in the concrete removing area.
Preferably, the concrete poured in the seventh step and the concrete poured in the eighth step are both micro-expansive concrete, and the strength of the micro-expansive concrete is higher than that of the concrete of the original structure outer wall by one level.
Preferably, in the fourth step, before the reinforcing steel bars of the thickened outer wall are bound, the surface of the outer wall of the original structure is roughened, and an interface agent is sprayed.
Preferably, the interval between the original structure floor slab and the thickened outer wall around the concrete removing area is not less than 200 mm.
Preferably, the template is an aluminum alloy template, and the template support is a triangular inclined support system.
Compared with the prior art, the invention has the characteristics and beneficial effects that:
(1) in the thickening process of the outer wall section of the basement, the floor slab of the original structure of the basement is reserved, only the concrete at the joint of the original structure floor slab and the thickened outer wall to be constructed is removed, and the steel bars of the original structure floor slab are reserved. When the basement outer wall section is thickened, the floor slab serves as an inner support of the original structure outer wall, the original structure outer wall serves as an outer support, the original structure is well kept, the bearing performance of the existing structure is fully exerted, meanwhile, the earth excavation is not carried out, and the influence on the surrounding environment is small. As the original horizontal structure (beam and plate) is put into use and is used as the outer wall inner support system to completely meet the stress requirement through inspection, the original horizontal structure is adopted as the inner support to be more reliable than a newly-built inner support from the structural stress angle. And need not to do in addition and support, save the expense, shorten the time limit for a project.
(2) By adopting the construction method disclosed by the invention to reinforce the cross section of the basement outer wall, the continuous construction of the node can be ensured, and the construction quality of the node is improved.
Drawings
Fig. 1 is a construction schematic diagram of collision between a newly-built wall and an original structural floor slab.
Fig. 2 is a schematic diagram of collision between a newly-built wall and an original structural floor slab.
FIG. 3 is a schematic diagram of bin selection by a skip bin method.
Fig. 4 is a schematic diagram of the collision between a newly-built wall and an original structural beam.
Fig. 5 is a construction schematic diagram of collision between a newly-built wall body and an original structural beam.
Fig. 6 is a schematic view of the anchor counter-pulling screw embedded in the bottom plate.
Fig. 7 is a schematic view of pre-burying ground anchor split screws in the original structural floor slab.
FIG. 8 is a schematic diagram of a supported template.
FIG. 9 is a schematic view of a supported formwork support.
FIG. 10 is a schematic view of the connection of the anchor tie-down bolt to the form support.
FIG. 11 is a schematic view of adjusting the verticality of the template.
The attached drawings are marked as follows: the method comprises the following steps of 1-thickening an outer wall, 2-templates, 3-template supports, 4-original structure floor slabs, 5-thickening outer wall steel bars, 6-ground anchor counter-pulling screws, 7-original structure outer wall, 8-concrete removing areas, 9-original structure beams and 10-reinforcing steel bars.
Detailed Description
In order to make the technical means, innovative features, objectives and functions realized by the present invention easy to understand, the present invention is further described below.
The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention provides a reinforcing construction method for increasing a section of an outer wall based on an existing basement structure, which comprises the following steps:
step one, determining the construction range, the section thickness and the height of the thickened outer wall 1 to be constructed according to the requirements of design files.
And step two, carrying out bin section division on the thickened outer wall 1 to be constructed along the horizontal direction. The width of the thickened outer wall 1 to be constructed of each bin section is the same as the interval between two adjacent original structural beams 9.
And step three, as shown in fig. 3, selecting bin sections by adopting a bin jumping method, so that the supporting effect of the original structure floor slab 4 on the original structure outer wall 7 can be ensured to the maximum extent, the wall forming quality is ensured, and common quality problems such as dimensional deviation, cracking and the like are avoided. According to the selected bin section, the thickened outer wall 1 is constructed layer by layer from bottom to top, concrete at the joint of the original structural floor 4 on the upper layer and the thickened outer wall 1 to be constructed is removed to form a concrete removing area 8, the width of the concrete removing area is equal to the section thickness of the thickened outer wall 1, and reinforcing steel bars of the original structural floor 4 are reserved. As shown in fig. 2, the distance between the original structural floor slab 4 around the concrete removal area 8 and the thickened outer wall 1 is not less than 200 mm.
And step four, before binding the thickened outer wall steel bars 5, roughening the surface of the original structure outer wall 7, removing loose parts to a real position, cleaning by using a steel wire brush, and spraying an interface agent. And planting the steel bars on the surface of the original structure outer wall 7. The steel bars are hot-rolled ribbed steel bars HRB400 phi 12, the steel bars are implanted into the original structure outer wall 7 for 15d (d is the diameter of the steel bars), and the length of the steel bars extending out of the original structure outer wall 7 is 15 d. The planting bar spacing is 200X 200 quincunx. In order to ensure the effect of bar planting, the bar planting glue adopts A-level glue. As shown in fig. 1, the thickened outer wall steel bars 5 on the layer are bound, the vertical steel bars of the thickened outer wall steel bars 5 penetrate through the concrete removing area 8 of the original structural floor slab 4 on the upper layer, and the length of the concrete removing area connected with the thickened outer wall steel bars 5 on the upper layer is reserved. As shown in fig. 4 and 5, when the thickened external wall steel bars 5 meet the original structural beam 9 in the binding process, the thickened external wall steel bars are broken at the original structural beam 9, and reinforcing steel bars 10 are arranged around the original structural beam 9. The original structural beam 9 is reserved before the external wall thickening construction is finished, and the beam is used as a horizontal support of the external wall of the basement.
Step five, as shown in fig. 7, the ground anchor counter-pulling screw 6 is pre-buried in the thickened outer wall 1 to be constructed, and the bottom end of the ground anchor counter-pulling screw 6 is connected with the steel bars in the original structure outer wall 7. As shown in fig. 6, if the formwork support 3 is erected on the foundation slab, the anchor tie-screw 6 should be pre-embedded during the construction of the foundation slab. An included angle of 45 degrees is formed between the part of the ground anchor counter-pulling screw rod 6 extending out of the ground anchor counter-pulling screw rod and the horizontal plane, and the exposed length is 130 mm.
Sixthly, as shown in fig. 8-10, supporting a formwork 2 and a formwork support 3 on one side of the inner side of the thickened outer wall 1 to be constructed, connecting the top end of the ground anchor counter-pulling screw 6 with the formwork support 3, and specifically, connecting the top end of the ground anchor counter-pulling screw 6 with the formwork support 3 through an outer connecting rod. The inner side adopts a mode that the triangular inclined supports and the unilateral screw rods are simultaneously stressed to reinforce the template 2 and the template support 3. The template 2 is an aluminum alloy template, and the template support 3 is a triangular inclined support system. As shown in fig. 11, the adjustable formwork 2 is vertical to the ground.
And seventhly, pouring concrete of the thickened outer wall 1 of the layer among the original structure outer wall 7, the template 2, the original structure floor 4 of the layer and the original structure floor 4 of the upper layer. The concrete is slightly expansive concrete, and the strength of the concrete is higher than that of the concrete of the original structure outer wall 7 by one level.
And step eight, pouring concrete in the concrete removing area 8 of the original structure floor slab 4 on the upper layer by adopting a mould lifting method, and removing the mould lifting after the concrete strength reaches 100% of the design strength. The concrete is slightly expansive concrete, and the strength of the concrete is higher than that of the concrete of the original structure outer wall 7 by one level.
And step nine, repeating the step three to the step eight, and finishing the construction of the thickened outer wall 1 of the bin section.
And step ten, repeating the step two to the step nine to finish the construction of the thickened outer wall 1 of all the bin sections.
The above examples are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (8)
1. A reinforcing construction method for increasing a cross section of an outer wall based on an existing basement structure is characterized by comprising the following steps:
step one, determining the construction range, the section thickness and the height of a thickened outer wall (1) to be constructed;
secondly, dividing the thickened outer wall (1) to be constructed into bin sections along the horizontal direction;
thirdly, constructing the thickened outer wall (1) layer by layer from bottom to top according to the selected bin section, removing concrete at the joint of the original structural floor slab (4) on the upper layer and the thickened outer wall (1) to be constructed to form a concrete removing area (8), wherein the width of the concrete removing area is equal to the section thickness of the thickened outer wall (1), and reinforcing steel bars of the original structural floor slab (4) are reserved;
fourthly, binding the thickened outer wall steel bars (5) on the layer, enabling the vertical steel bars of the thickened outer wall steel bars (5) to penetrate through the concrete removing area (8) of the original structural floor slab (4) on the upper layer, and reserving the length connected with the thickened outer wall steel bars (5) on the upper layer; when meeting the original structural beam (9) in the binding process of the thickened outer wall reinforcing steel bars (5), the thickened outer wall reinforcing steel bars are broken at the original structural beam (9), and reinforcing steel bars (10) are arranged on the periphery of the original structural beam (9);
fifthly, pre-burying a ground anchor counter-pulling screw rod (6) in the thickened outer wall (1) to be constructed, wherein the bottom end of the ground anchor counter-pulling screw rod (6) is connected with a steel bar in the original structure outer wall (7); if the template support (3) is erected on the foundation slab, the ground anchor counter-pulling screw (6) is pre-embedded in the construction process of the foundation slab;
sixthly, supporting a template (2) and a template support (3) on the single side of the inner side of the thickened outer wall (1) to be constructed, and connecting the top end of the ground anchor counter-pulling screw rod (6) with the template support (3); the inner side of the template support is reinforced by adopting a mode that the triangular inclined support and the single-side screw are simultaneously stressed;
seventhly, pouring concrete of the thickened outer wall (1) of the layer between the original structure outer wall (7), the template (2), the original structure floor (4) of the layer and the original structure floor (4) of the upper layer;
eighthly, pouring concrete in a concrete removing area (8) of the original structural floor slab (4) on the upper layer;
step nine, repeating the step three to the step eight to finish the construction of the thickened outer wall (1) of the bin section;
and step ten, repeating the step two to the step nine, and finishing the construction of the thickened outer walls (1) of all the bin sections.
2. The existing basement structure-based external wall section-enlarging reinforcing construction method according to claim 1, wherein the method comprises the following steps: and in the second step, the width of the thickened outer wall (1) to be constructed of each bin section is the same as the interval between two adjacent original structural beams (9).
3. The existing basement structure-based external wall section-enlarging reinforcing construction method according to claim 1, wherein the method comprises the following steps: and selecting the bin sections by adopting a bin skipping method in the third step.
4. The existing basement structure-based external wall section-enlarging reinforcing construction method according to claim 1, wherein the method comprises the following steps: and step eight, pouring concrete in the concrete removing area (8) by adopting a mould lifting method.
5. The existing basement structure-based external wall section-enlarging reinforcing construction method according to claim 1, wherein the method comprises the following steps: the concrete poured in the seventh step and the eighth step is micro-expansive concrete, and the strength of the concrete is higher than that of the concrete of the original structure outer wall (7) by one level.
6. The existing basement structure-based external wall section-enlarging reinforcing construction method according to claim 1, wherein the method comprises the following steps: in the fourth step, before the thickened external wall reinforcing steel bars (5) are bound, the surface of the external wall (7) of the original structure is roughened, and an interface agent is sprayed.
7. The existing basement structure-based external wall section-enlarging reinforcing construction method according to claim 1, wherein the method comprises the following steps: the interval between the original structure floor (4) and the thickened outer wall (1) at the periphery of the concrete removing area (8) is not less than 200 mm.
8. The existing basement structure-based external wall section-enlarging reinforcing construction method according to claim 1, wherein the method comprises the following steps: the template (2) is an aluminum alloy template, and the template support (3) is a triangular inclined support system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011111755.0A CN112376636B (en) | 2020-10-16 | 2020-10-16 | Reinforcing construction method for increasing cross section of outer wall based on existing basement structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011111755.0A CN112376636B (en) | 2020-10-16 | 2020-10-16 | Reinforcing construction method for increasing cross section of outer wall based on existing basement structure |
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| CN112376636A CN112376636A (en) | 2021-02-19 |
| CN112376636B true CN112376636B (en) | 2022-01-28 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107859352A (en) * | 2017-11-23 | 2018-03-30 | 中铁建设集团南方工程有限公司 | Consolidation process construction at skyscraper different strength concrete bean column node |
| CN108716283A (en) * | 2018-08-23 | 2018-10-30 | 杭州江润科技有限公司 | The construction method of big section cast-in-situ steel reinforced concrete construction of inclined column structure |
| CN109403632A (en) * | 2018-12-08 | 2019-03-01 | 上海宝冶集团有限公司 | A kind of ground-connecting-wall crown beam and superstructure connection construction method |
| CN109610881A (en) * | 2018-12-19 | 2019-04-12 | 中建三局第建设工程有限责任公司 | Prestressed girder underpins disconnected column construction method in a kind of existing tier building transformation |
| CN111395745A (en) * | 2020-03-16 | 2020-07-10 | 中国建筑第四工程局有限公司 | Basement outer wall single-face formwork supporting system and construction method thereof |
-
2020
- 2020-10-16 CN CN202011111755.0A patent/CN112376636B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107859352A (en) * | 2017-11-23 | 2018-03-30 | 中铁建设集团南方工程有限公司 | Consolidation process construction at skyscraper different strength concrete bean column node |
| CN108716283A (en) * | 2018-08-23 | 2018-10-30 | 杭州江润科技有限公司 | The construction method of big section cast-in-situ steel reinforced concrete construction of inclined column structure |
| CN109403632A (en) * | 2018-12-08 | 2019-03-01 | 上海宝冶集团有限公司 | A kind of ground-connecting-wall crown beam and superstructure connection construction method |
| CN109610881A (en) * | 2018-12-19 | 2019-04-12 | 中建三局第建设工程有限责任公司 | Prestressed girder underpins disconnected column construction method in a kind of existing tier building transformation |
| CN111395745A (en) * | 2020-03-16 | 2020-07-10 | 中国建筑第四工程局有限公司 | Basement outer wall single-face formwork supporting system and construction method thereof |
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