CN112359889B - Foundation slab reinforcement reverse construction method - Google Patents
Foundation slab reinforcement reverse construction method Download PDFInfo
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- CN112359889B CN112359889B CN202011115818.XA CN202011115818A CN112359889B CN 112359889 B CN112359889 B CN 112359889B CN 202011115818 A CN202011115818 A CN 202011115818A CN 112359889 B CN112359889 B CN 112359889B
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- 238000010276 construction Methods 0.000 title claims abstract description 23
- 230000002787 reinforcement Effects 0.000 title claims abstract description 20
- 239000004567 concrete Substances 0.000 claims abstract description 43
- 229910000831 Steel Inorganic materials 0.000 claims description 33
- 239000010959 steel Substances 0.000 claims description 33
- 230000003014 reinforcing effect Effects 0.000 claims description 15
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 13
- 238000001514 detection method Methods 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 2
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 230000009466 transformation Effects 0.000 abstract description 3
- 238000009435 building construction Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000007788 roughening 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
- 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
- E04G23/0229—Increasing or restoring the load-bearing capacity of building construction elements of foundations or foundation walls
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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
- E04G23/024—Increasing or restoring the load-bearing capacity of building construction elements of basement floors
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Foundations (AREA)
- Working Measures On Existing Buildindgs (AREA)
Abstract
The invention relates to a foundation slab reinforcement reverse construction method, which belongs to the technical field of house building construction and structural reinforcement transformation. And then pouring concrete in the pit slot, and finally installing a new bearing column. The invention effectively solves the problem of difficult installation when the positions of the new structural column and the old structural column conflict, and improves the construction efficiency. But also the integrity of the concrete at the bottom of the structural column is improved, and the safety is improved.
Description
Technical Field
The invention relates to the technical field of house building construction and structural reinforcement transformation, in particular to a foundation slab reinforcement reverse construction method.
Background
With the acceleration of urban construction updating speed, part of old buildings can not meet functional requirements, underground space transformation and foundation reinforcement projects are more and more, and the application of the reverse construction method construction technology is more and more extensive. However, the following two problems may occur during the foundation reinforcement process:
firstly, the bearing column (box type steel column) of a new structure is positioned to be partially overlapped with the bearing column (concrete column) of an old structure, the existing of the old structure column influences the construction of the new structure column, and the direct dismantling of the old structure column can damage a structure balance system and influence the structure safety.
Secondly, the reinforcement of the foundation slab needs to be completed before the old structural columns are dismantled, and the old structural columns affect the reinforcement and concrete pouring of the foundation slab.
Disclosure of Invention
The invention aims to provide a foundation slab reinforcement reverse construction method to solve the technical problems that the existing old structural columns affect the reinforcement integrity of the foundation slab and positioning conflicts between new and old structural columns cannot be constructed.
In order to solve the technical problem, the invention provides a foundation slab reinforcement reverse construction method, which comprises the following steps:
binding new foundation slab steel bars on the top of an original foundation slab, and reserving a section of interval between the new foundation slab steel bars and an original bearing column;
step two, pouring concrete on the top of the original foundation slab to form a new foundation slab, reserving pit slots around the original bearing column during pouring, and enabling one end of the reinforcing steel bars of the new foundation slab, which is close to the original bearing column, to exceed the new foundation slab to form reinforcing steel bar joints;
thirdly, after the concrete reaches a certain strength, arranging temporary steel supports around the original bearing column and at the top of the new foundation bottom plate, and carrying out back jacking on the original bearing column;
step four, dismantling the original bearing column and the original foundation bottom plate right below the pit slot;
fifthly, pouring concrete again at the position of the original foundation slab right below the pit slot;
step six, after the concrete reaches a certain strength, binding a reinforcing mesh in the pit groove, and connecting the reinforcing mesh with a reinforcing joint;
seventhly, placing an embedded part on the top of the reinforcing mesh in the pit groove and leveling;
step eight, pouring concrete in the pit slot;
and step nine, after the concrete reaches a certain strength, hoisting the new bearing column to the position of the original bearing column, and welding the new bearing column with the embedded part.
Preferably, in the step one, before binding the reinforcing steel bars of the new foundation slab, the top of the original foundation slab is roughened, and an interface agent is sprayed.
Preferably, after the top of the original foundation slab is roughened, the steel bars are planted into the original foundation slab, and the steel bars are partially exposed.
Preferably, when concrete is poured on the top of the original foundation slab in the second step, the concrete vibrating points are arranged in a quincunx shape, the concrete is vibrated according to the sequence of four sides and the middle, and then the concrete is cured.
Preferably, in the third step, flaw detection is carried out after the original bearing column is jacked back, and a flaw detection report is issued to ensure the construction quality of the temporary steel support.
Preferably, the reinforcing steel bars of the original foundation slab are reserved when the original foundation slab right below the pit slot is removed in the fourth step.
Preferably, the concrete poured on the top of the original foundation slab is C40 concrete, and the concrete poured on the position of the original foundation slab right below the pit slot and the concrete poured in the pit slot are both C60 concrete.
Preferably, the connection mode of the reinforcing steel bar net and the reinforcing steel bar joint in the sixth step is fusion welding.
Preferably, the embedded part comprises an anchor plate and anchor bars connected to the bottom of the anchor plate.
Preferably, the new bearing column is a box-type steel column.
Compared with the prior art, the invention has the characteristics and beneficial effects that: the foundation slab reinforcement reverse construction method effectively solves the problem of difficult installation when the positions of the new structural column and the old structural column conflict, and improves the construction efficiency. But also the integrity of the concrete at the bottom of the structural column is improved, and the safety is improved.
Drawings
Fig. 1 is a schematic diagram of reserved pits and reserved steel bar joints around an original structural column.
Fig. 2 is a schematic view of the original foundation slab removed from the original support pillar and directly below the pit.
FIG. 3 is a schematic diagram of the completion of the reinforcing reverse construction of the foundation slab.
FIG. 4 is a schematic plan view of an embedment.
The attached drawings are marked as follows: 1-original foundation slab, 2-new foundation slab steel bars, 3-original bearing column, 4-new foundation slab, 5-pit slot, 6-steel bar joint, 7-new bearing column, 8-embedded part, 81-anchor plate and 82-anchor bar.
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 foundation slab reinforcement reverse construction method, which comprises the following steps:
firstly, roughening the top of the original foundation slab 1 and spraying an interface agent. After the top of the original foundation slab 1 is roughened, the steel bars are planted into the original foundation slab 1, and the steel bars are partially exposed. Binding new foundation slab reinforcing steel bars 2 on the top of the original foundation slab 1, and reserving a section of interval between the new foundation slab reinforcing steel bars 2 and the original bearing column 3.
And step two, pouring C40 concrete on the top of the original foundation slab 1 to form a new foundation slab 4, and reserving pit slots 5 around the original bearing column 3 during pouring. When concrete is poured on the top of the original foundation slab 1, the concrete vibrating points are arranged in a quincunx shape, and are vibrated according to the sequence of four sides and the middle, and then the concrete is cured. And one end of the new foundation slab steel bar 2 close to the original bearing column 3 exceeds the new foundation slab 4 to form a steel bar joint 6, and the reserved steel bar joint 6 is convenient for being connected with a steel bar mesh in the following process, as shown in figure 1.
And step three, after the concrete reaches a certain strength, arranging temporary steel supports around the original bearing column 3 and at the top of the new foundation bottom plate 4, and carrying out back jacking on the original bearing column 3. And (4) performing flaw detection after jacking, and issuing a flaw detection report to ensure the construction quality of the temporary steel support.
And step four, dismantling the original bearing column 3 and the original foundation slab 1 right below the pit 5. And (3) when the original foundation slab 1 right below the pit 5 is removed, the reinforcing steel bars of the original foundation slab 1 are reserved, as shown in fig. 2.
And step five, pouring C60 concrete again at the position of the original foundation slab 1 right below the pit 5.
And step six, after the concrete reaches a certain strength, binding a reinforcing mesh in the pit 5, and connecting the reinforcing mesh with the reinforcing joint 6. The connection mode of the reinforcing mesh and the reinforcing joint 6 is the fusion welding of the upper bars.
And step seven, placing the embedded parts 8 on the tops of the reinforcing meshes in the pit 5 and leveling. The embedment 8 includes anchor plates 81 and anchor bars 82 attached to the bottom of the anchor plates 81, as shown in FIG. 4.
And step eight, pouring C60 concrete in the pit 5.
And step nine, after the concrete reaches a certain strength, hoisting the new bearing column 7 to the position of the original bearing column 3, and welding the new bearing column 7 and the embedded part 8, as shown in fig. 3. The new bearing column 7 is a box-type steel column.
Specifically, taking a certain project as an example, the original bearing column 3 is a reinforced concrete column with the diameter of 800mm, and the new bearing column 7 is a box-type steel column with the diameter of 800mm x 800 mm. The edge of the pit 5 is 3400mm away from the original bearing column, namely the pit 5 is 1600mm long, 1600mm wide and 800mm high. The reserved steel bar joint 6 is 300mm long. The anchor plate 81 is a square with the side length of 1000mm, the thickness of the anchor plate 81 is 60mm, and the model of the anchor bar 82 is HRB400 phi 20. The spacing between adjacent anchor bars 82 is 200mm, and the distance between the edge anchor bars 82 and the edge of the anchor plate 81 is 100 mm. The new foundation slab steel bars 2 and the steel bar meshes in the pit 5 are all HRB400 phi 32 steel bars.
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 (5)
1. A foundation slab reinforcement reverse construction method is characterized by comprising the following steps:
firstly, before binding a new foundation slab reinforcing steel bar (2), chiseling the top of an original foundation slab (1), and spraying an interface agent; after the top of the original foundation slab (1) is roughened, planting bars into the original foundation slab (1), and exposing the steel bars; binding new foundation bottom plate steel bars (2) at the top of the original foundation bottom plate (1), and reserving a section of interval between the new foundation bottom plate steel bars (2) and the original bearing column (3); step two, pouring concrete on the top of the original foundation slab (1) to form a new foundation slab (4), reserving pit slots (5) around the original bearing column (3) during pouring, and enabling one end of a new foundation slab steel bar (2) close to the original bearing column (3) to exceed the new foundation slab (4) to form a steel bar joint (6); when concrete is poured on the top of the original foundation slab (1), concrete vibrating points are arranged in a quincunx shape, and are vibrated according to the sequence of four sides and the middle, and then the concrete is cured;
thirdly, after the concrete reaches a certain strength, arranging temporary steel supports around the original bearing column (3) and at the top of the new foundation bottom plate (4), and carrying out back jacking on the original bearing column (3); performing flaw detection after the original bearing column (3) is jacked back, and issuing a flaw detection report to ensure the construction quality of the temporary steel support;
fourthly, dismantling the original bearing column (3) and the original foundation bottom plate (1) right below the pit slot (5); the reinforcing steel bars of the original foundation bottom plate (1) are reserved when the original foundation bottom plate (1) right below the pit slot (5) is removed;
fifthly, pouring concrete again at the position of the original foundation slab (1) right below the pit slot (5);
step six, binding a reinforcing mesh in the pit groove (5) after the concrete reaches a certain strength, and connecting the reinforcing mesh with a reinforcing joint (6);
seventhly, placing an embedded part (8) on the top of the reinforcing mesh in the pit slot (5) and leveling;
step eight, pouring concrete in the pit groove (5);
and step nine, after the concrete reaches a certain strength, hoisting the new bearing column (7) to the position of the original bearing column (3), and welding the new bearing column (7) and the embedded part (8).
2. The foundation slab reinforcement reverse construction method according to claim 1, characterized in that: the concrete poured on the top of the original foundation slab (1) is C40 concrete, and the concrete poured at the position of the original foundation slab (1) right below the pit slot (5) and the concrete poured in the pit slot (5) are both C60 concrete.
3. The foundation slab reinforcement reverse construction method according to claim 1, characterized in that: and in the sixth step, the connection mode of the reinforcing steel bar net and the reinforcing steel bar joint (6) is the welding of the melting groove edge.
4. The foundation slab reinforcement reverse construction method according to claim 1, characterized in that: the embedded part (8) comprises an anchor plate (81) and anchor bars (82) connected to the bottom of the anchor plate (81).
5. The foundation slab reinforcement reverse construction method according to claim 1, characterized in that: the new bearing column (7) is a box-type steel column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011115818.XA CN112359889B (en) | 2020-10-19 | 2020-10-19 | Foundation slab reinforcement reverse construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011115818.XA CN112359889B (en) | 2020-10-19 | 2020-10-19 | Foundation slab reinforcement reverse construction method |
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| Publication Number | Publication Date |
|---|---|
| CN112359889A CN112359889A (en) | 2021-02-12 |
| CN112359889B true CN112359889B (en) | 2022-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011115818.XA Expired - Fee Related CN112359889B (en) | 2020-10-19 | 2020-10-19 | Foundation slab reinforcement reverse construction method |
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| CN (1) | CN112359889B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105604344A (en) * | 2016-02-28 | 2016-05-25 | 叶香竹 | Reinforcing method of cracked interior wall |
| CN105735382A (en) * | 2016-03-11 | 2016-07-06 | 上海建工二建集团有限公司 | Temporary underpinning structure of existing structure foundation and construction method of temporary underpinning structure |
| CN106638506A (en) * | 2015-07-07 | 2017-05-10 | 苏州汇诚智造工业设计有限公司 | Construction method of stilling pool base slab reinforcing structure |
| CN107574834A (en) * | 2017-10-11 | 2018-01-12 | 天脊煤化工集团股份有限公司 | A kind of old basic transformation reinforcement means of power machine |
| CN109723064A (en) * | 2018-12-28 | 2019-05-07 | 中国二十冶集团有限公司 | Ensure the interim retaining wall column and its construction method of enlarging deep pit monitor |
| CN110284726A (en) * | 2019-06-28 | 2019-09-27 | 中国一冶集团有限公司 | The reinforced construction method of concrete frame trestle |
| CN110805078A (en) * | 2019-11-14 | 2020-02-18 | 中机中联工程有限公司 | Rear-mounted rock foundation expansion and reinforcement construction method |
-
2020
- 2020-10-19 CN CN202011115818.XA patent/CN112359889B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106638506A (en) * | 2015-07-07 | 2017-05-10 | 苏州汇诚智造工业设计有限公司 | Construction method of stilling pool base slab reinforcing structure |
| CN105604344A (en) * | 2016-02-28 | 2016-05-25 | 叶香竹 | Reinforcing method of cracked interior wall |
| CN105735382A (en) * | 2016-03-11 | 2016-07-06 | 上海建工二建集团有限公司 | Temporary underpinning structure of existing structure foundation and construction method of temporary underpinning structure |
| CN107574834A (en) * | 2017-10-11 | 2018-01-12 | 天脊煤化工集团股份有限公司 | A kind of old basic transformation reinforcement means of power machine |
| CN109723064A (en) * | 2018-12-28 | 2019-05-07 | 中国二十冶集团有限公司 | Ensure the interim retaining wall column and its construction method of enlarging deep pit monitor |
| CN110284726A (en) * | 2019-06-28 | 2019-09-27 | 中国一冶集团有限公司 | The reinforced construction method of concrete frame trestle |
| CN110805078A (en) * | 2019-11-14 | 2020-02-18 | 中机中联工程有限公司 | Rear-mounted rock foundation expansion and reinforcement construction method |
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| Publication number | Publication date |
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| CN112359889A (en) | 2021-02-12 |
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