CN116575753B - Method for dismantling underground structure by combining pile anchor support and main body structure - Google Patents
Method for dismantling underground structure by combining pile anchor support and main body structure Download PDFInfo
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- CN116575753B CN116575753B CN202310833077.6A CN202310833077A CN116575753B CN 116575753 B CN116575753 B CN 116575753B CN 202310833077 A CN202310833077 A CN 202310833077A CN 116575753 B CN116575753 B CN 116575753B
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- anchor
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- tensioning
- foundation pit
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000013461 design Methods 0.000 claims abstract description 11
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 22
- 239000010959 steel Substances 0.000 claims description 22
- 238000009412 basement excavation Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 238000004458 analytical method Methods 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 abstract description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 238000003466 welding Methods 0.000 abstract 1
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- 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
- E04G23/08—Wrecking of buildings
-
- 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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a method for dismantling an underground structure by combining a pile anchor support and a main body structure, which comprises the following steps: s1, determining the anchor rod position according to a foundation pit design drawing, taking a side wall hole of a structure formed by the anchor rod position as an anchor disc installation hand hole, enabling the cut anchor rod to expose the end head, and installing an end head anchor disc; s2, mounting brackets and end plates; welding a pedestal on the inner side of the end plate; installing an anchor disc for fixing; s3, installing a jack, a shaft force meter and an anchor disc for tensioning; s4, determining the stretching force of the anchor rod during foundation pit design, starting a jack, and stretching the anchor rod; s5, dismantling the underground structure, and backfilling the foundation pit. The invention omits the re-application of the supporting structure, and is lower in carbon and economical; the calculation and analysis are simple and convenient, and no additional deformation is generated in the theoretical dismantling process; the method has no influence on the ground, does not influence pedestrians and traffic on the ground, and solves the difficult problem of inconvenient construction in narrow places in cities.
Description
Technical Field
The invention relates to the technical field of underground structure dismantling, in particular to a method for dismantling an underground structure by combining a pile anchor support and a main body structure.
Background
The development of underground space has been greatly developed at present, the construction technology of underground structures is also mature, the development of underground space in developed countries and developed areas is earlier, and part of urban underground structures cannot meet the urban planning requirements at present, so that the underground structures need to be dismantled, the building envelope can be reserved, but the internal structures of the underground structures need to be dismantled.
The design of the pile anchor supporting underground structure can adopt a mode of combining a supporting structure with a main body structure, the anchor head of the anchor rod is required to be cut off before the side wall of the main body structure is constructed, and the anchor rod does not play a role any more. When the structure is dismantled, supporting measures are needed, and internal supporting can be added again, but the structure is uneconomical and time-consuming. The anchor head of the anchor rod is cut, so that the anchor rod cannot be used, and the anchor rod is re-installed, so that the problems are also solved.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a method for dismantling an underground structure by combining a pile anchor support and a main body structure.
The invention adopts the following technical scheme to realize the aim: a method for dismantling an underground structure by combining a pile anchor support and a main body structure comprises the following steps:
s1, determining the anchor rod position according to a foundation pit design drawing, taking a side wall hole of a structure formed by the anchor rod position as an anchor disc installation hand hole, enabling the cut anchor rod to expose the end head, and installing an end head anchor disc;
the end anchor disc penetrates into two inhaul cables in advance, is clamped by a clamping piece, penetrates the anchor rod into an anchor bar hole in the middle of the end anchor disc, and is clamped by the clamping piece;
s2, mounting a bracket, mounting a steel purlin closely attached to the side wall of the structure, placing the purlin on the bracket, and mounting an end plate at the position of the anchor rod;
the end plate is provided with holes, so that a inhaul cable can conveniently pass through the holes and is welded and fixed with the steel purlin, and a pedestal is welded on the inner side of the end plate;
the anchor disc for fixing is installed, the clamping piece is not placed, the inhaul cable can slide freely in the anchor rib hole, and the anchor disc for fixing is fixed on the pedestal;
s3, installing a jack, a shaft force meter and an anchor disc for tensioning;
s4, determining the stretching force of the anchor rod during foundation pit design, starting a jack, and stretching the anchor rod;
re-tensioning the anchor rod to a tensioning control load of the anchor rod when the foundation pit is excavated, and performing secondary tensioning after ten days to eliminate prestress loss;
after the secondary tensioning is completed, locking the inhaul cable on the anchor disc for fixing by using a clamping piece, removing the jack, the axial force meter and the anchor disc for tensioning, and cutting redundant inhaul cables;
s5, dismantling an underground structure, and backfilling a foundation pit;
dismantling the interior of the underground structure, wherein the underground structure comprises a bottom plate, a floor slab, a middle wall body and upright posts;
and backfilling the foundation pit in a layered manner, and compacting the foundation pit in a layered manner.
Further, anchor bar holes are arranged on the end anchor disc, and the directions of the two anchor bar holes at the end part and the anchor bar hole in the middle part are opposite, so that the two anchor bar holes are respectively used for clamping a inhaul cable and an anchor rod.
Further, the bracket is welded by I-steel and steel plate, and is fixed on the side wall of the structure by rivets.
Furthermore, the steel purlin is formed by processing I-steel.
Further, steel plates are welded at the end plate positions as stiffening plates.
And step S3, specifically, a jack is arranged on the anchor disc for fixing, an axial force meter is arranged at the end part of the jack, the anchor disc for tensioning is arranged, the clamping piece is used for clamping a inhaul cable, and the axial force meter and the anchor disc for tensioning are tightly pressed by the jack.
The beneficial effects of the invention are as follows: the invention provides the support in the construction process of removing the underground structure by using the original anchor rod, thereby omitting the re-construction of the support structure and being lower in carbon and economical; because the dismantling is the reverse process of construction and the supporting position is unchanged, the calculation and analysis are simple and convenient, and no additional deformation is generated in the theoretical dismantling process; the construction method provided by the invention has no influence on the ground, does not influence pedestrians and traffic on the ground, and solves the problem of inconvenient construction in narrow places in cities.
Drawings
FIG. 1 is a schematic cross-sectional view of a pile anchor support structure according to the present invention;
FIG. 2 is a schematic view of a pile anchor during tensioning of the anchor rod according to the present invention;
FIG. 3 is a schematic illustration of the axial measurement of a pile during tensioning of a bolt according to the present invention;
FIG. 4 is a schematic view of the post-tensioning pile anchor according to the present invention;
FIG. 5 is a schematic diagram of the axial measurement of the pile anchor after tensioning according to the present invention;
FIG. 6 is a schematic illustration of the connection of the end anchor disc to the cable and the anchor rod of the present invention;
in the figure: 1-guard piles; 2-anchor rod; 3-structure side walls; 4-floor slab; 5-a bottom plate; 6-end anchor disc; 7-inhaul cables; 8-an anchor disc for fixing; 9, an anchor disc for stretching; 10-steel purlin; 11-stiffening plates; 12-brackets; 13-end plates; 14-a pedestal; 15-jack; 16-an axial force meter; 17-anchor disc mounting hand holes; 18-clamping pieces; 19-anchor bar holes;
the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Detailed Description
The invention is further illustrated by the following examples:
as shown in fig. 1 to 6, a method for removing an underground structure by combining a pile anchor support and a main structure comprises the following specific steps:
s1, determining the position of an anchor rod 2 according to a foundation pit design drawing, taking a hole formed in a side wall 3 of a structure formed by the anchor rod 2 as an anchor disc mounting hand hole 17, enabling the cut anchor rod 2 to be exposed out of the end, and mounting an end anchor disc 6;
anchor bar holes 19 are arranged on the end anchor disc 6, and the directions of the two anchor bar holes 19 at the end part are opposite to the directions of the anchor bar holes 19 at the middle part, so that the two anchor bar holes are respectively used for clamping the inhaul cable 7 and the anchor rod 2;
two inhaul cables 7 are penetrated in advance, clamped by clamping pieces 18, the anchor rod 2 is penetrated into anchor bar holes 19 in the middle of the end head anchor disc 6, and clamped by the clamping pieces 18;
s2, mounting a bracket 12, mounting a steel purlin 10 close to the structural side wall 3, placing the purlin on the bracket 12, and mounting an end plate 13 at the position of the anchor rod 2;
the bracket 12 is welded by I-steel and steel plates and is fixed on the structural side wall 3 by rivets;
the end plate 13 is provided with a hole, so that the inhaul cable 7 can conveniently pass through and be welded and fixed with the steel purlin 10, and a pedestal 14 is welded on the inner side of the end plate 13;
the steel purlin 10 is processed by adopting I-steel, and a steel plate is welded at the position of the end plate 13 to serve as a stiffening plate 11;
the anchor disc 8 for fixing is installed, the clamping piece 18 is not placed, the guy rope 7 can slide freely in the anchor rib hole 19, and the anchor disc 8 for fixing is fixed on the pedestal 14;
s3, a jack 15 is arranged on the anchor disc 8 for fixing, an axial force meter 16 is arranged at the end part of the jack 15, the anchor disc 9 for tensioning is arranged, the clamping piece 18 is used for clamping the inhaul cable 7, and the axial force meter 16 and the anchor disc 9 for tensioning are tightly jacked by the jack 15;
s4, determining the stretching force of the anchor rod 2 during foundation pit design, starting the jack 15, and stretching the anchor rod 2;
re-tensioning the anchor rods 2 to the tensioning control load of the anchor rods 2 in the foundation pit excavation design, and performing secondary tensioning after ten days to eliminate prestress loss;
after the secondary tensioning is completed, the stay rope 7 is locked by a clamping piece 18 on the anchor disc 8 for fixing, the jack 15, the axial force meter 16 and the anchor disc 9 for tensioning are removed, and the redundant stay rope 7 is cut;
s5, dismantling the interior of the underground structure, wherein the underground structure comprises a floor slab 4, a bottom plate 5, a middle wall body and upright posts;
and backfilling the foundation pit in a layered manner, and compacting the foundation pit in a layered manner.
While the invention has been described above by way of example, it will be apparent that the invention is not limited to the above embodiments, but is intended to be within the scope of the invention, as long as various modifications of the method concepts and technical solutions of the invention are adopted, or as long as modifications are directly applicable to other applications without modification.
Claims (5)
1. The method for dismantling the underground structure by combining the pile anchor support and the main body structure is characterized by comprising the following steps of:
s1, determining the position of an anchor rod (2) according to a foundation pit design drawing, taking a hole formed in a side wall (3) of a structure formed by the anchor rod (2) as an anchor disc mounting hand hole (17), enabling the cut anchor rod (2) to expose out of an end head, and mounting an end head anchor disc (6);
the end anchor disc (6) penetrates into two inhaul cables (7) in advance, is clamped by a clamping piece (18), penetrates the anchor rod (2) into an anchor rib hole (19) in the middle of the end anchor disc (6), and is clamped by the clamping piece (18);
anchor bar holes (19) are arranged on the end anchor disc (6), and the two anchor bar holes (19) at the end are opposite to the anchor bar holes (19) at the middle part and are respectively used for clamping the inhaul cable (7) and the anchor rod (2);
s2, installing a bracket (12), installing a steel purlin (10) close to the structural side wall (3), placing the purlin on the bracket (12), and installing an end plate (13) at the position of the anchor rod (2);
the end plate (13) is provided with holes, so that a guy cable (7) can conveniently pass through and is welded and fixed with the steel purlin (10), and a pedestal (14) is welded on the inner side of the end plate (13);
the anchor disc (8) for fixing is arranged, the clamping piece (18) is not put, the guy rope (7) can slide freely in the anchor rib hole (19), and the anchor disc (8) for fixing is fixed on the pedestal (14);
s3, installing a jack (15), a shaft force meter (16) and an anchor disc (9) for tensioning;
s4, determining the stretching force of the anchor rod (2) in the foundation pit design, starting the jack (15), and stretching the anchor rod (2);
re-tensioning the anchor rod (2) to a tensioning control load of the anchor rod (2) in the foundation pit excavation design, and performing secondary tensioning after ten days to eliminate prestress loss;
after the secondary tensioning is finished, the stay rope (7) is locked by a clamping piece (18) on the anchor disc (8) for fixing, the jack (15), the axial force meter (16) and the anchor disc (9) for tensioning are removed, and the redundant stay rope (7) is cut;
s5, dismantling an underground structure, and backfilling a foundation pit;
the interior of the underground structure is dismantled, and the underground structure comprises a bottom plate (5), a floor slab (4), a middle wall body and upright posts;
and backfilling the foundation pit in a layered manner, and compacting the foundation pit in a layered manner.
2. A method of demolishing an underground structure in combination with a main structure, a pile anchor support according to claim 1, characterized in that the brackets (12) are welded from i-steel and steel plates and are fastened to the side walls (3) of the structure by rivets.
3. A method of demolishing an underground structure in combination with a pile anchor support and a main structure according to claim 2, characterized in that the steel purlin (10) is machined from i-steel.
4. A method of demolishing a pile anchor support combined with a main structure according to claim 3, characterized in that steel plates are welded as stiffening plates (11) at the end plate (13) locations.
5. The method for removing the underground structure by combining the pile anchor support and the main body structure according to claim 4, wherein the step S3 is characterized in that a jack (15) is arranged on the anchor disc (8) for fixing, an axial force meter (16) is arranged at the end part of the jack (15), the anchor disc (9) for tensioning is arranged, the clamping piece (18) is used for clamping the inhaul cable (7), and the axial force meter (16) and the anchor disc (9) for tensioning are tightly supported by the jack (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310833077.6A CN116575753B (en) | 2023-07-10 | 2023-07-10 | Method for dismantling underground structure by combining pile anchor support and main body structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310833077.6A CN116575753B (en) | 2023-07-10 | 2023-07-10 | Method for dismantling underground structure by combining pile anchor support and main body structure |
Publications (2)
| Publication Number | Publication Date |
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| CN116575753A CN116575753A (en) | 2023-08-11 |
| CN116575753B true CN116575753B (en) | 2023-09-05 |
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| CN202310833077.6A Active CN116575753B (en) | 2023-07-10 | 2023-07-10 | Method for dismantling underground structure by combining pile anchor support and main body structure |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140042371A (en) * | 2012-09-28 | 2014-04-07 | 정웅희 | The installation structure for the aritificial wall of the nature stone shape to use anchor |
| CN107447756A (en) * | 2017-09-25 | 2017-12-08 | 西南石油大学 | A kind of constructing device for compensating prestressd anchor cable loss and compensation construction method |
| CN109056810A (en) * | 2018-09-19 | 2018-12-21 | 中铁二院工程集团有限责任公司 | The transverse direction that open cut or lid dig underground main structure below existing building digs construction and its construction method |
| CN111945725A (en) * | 2020-08-04 | 2020-11-17 | 北京市政建设集团有限责任公司 | Prestress intelligent applying system and method for anchor cable supporting structure |
| CN111945724A (en) * | 2020-08-04 | 2020-11-17 | 北京市政建设集团有限责任公司 | Anchor cable supporting structure with large-diameter reinforcement rod body and intelligent prestress application method |
| CN115217112A (en) * | 2022-08-10 | 2022-10-21 | 中建七局第二建筑有限公司 | Deep foundation pit construction method |
-
2023
- 2023-07-10 CN CN202310833077.6A patent/CN116575753B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140042371A (en) * | 2012-09-28 | 2014-04-07 | 정웅희 | The installation structure for the aritificial wall of the nature stone shape to use anchor |
| CN107447756A (en) * | 2017-09-25 | 2017-12-08 | 西南石油大学 | A kind of constructing device for compensating prestressd anchor cable loss and compensation construction method |
| CN109056810A (en) * | 2018-09-19 | 2018-12-21 | 中铁二院工程集团有限责任公司 | The transverse direction that open cut or lid dig underground main structure below existing building digs construction and its construction method |
| CN111945725A (en) * | 2020-08-04 | 2020-11-17 | 北京市政建设集团有限责任公司 | Prestress intelligent applying system and method for anchor cable supporting structure |
| CN111945724A (en) * | 2020-08-04 | 2020-11-17 | 北京市政建设集团有限责任公司 | Anchor cable supporting structure with large-diameter reinforcement rod body and intelligent prestress application method |
| CN115217112A (en) * | 2022-08-10 | 2022-10-21 | 中建七局第二建筑有限公司 | Deep foundation pit construction method |
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| CN116575753A (en) | 2023-08-11 |
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