CN116641321A - Supporting and protecting method for existing viaduct pier stud close to deep foundation pit - Google Patents
Supporting and protecting method for existing viaduct pier stud close to deep foundation pit Download PDFInfo
- Publication number
- CN116641321A CN116641321A CN202310873699.1A CN202310873699A CN116641321A CN 116641321 A CN116641321 A CN 116641321A CN 202310873699 A CN202310873699 A CN 202310873699A CN 116641321 A CN116641321 A CN 116641321A
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- cylindrical steel
- support
- foundation pit
- deep foundation
- pier stud
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims description 73
- 239000010959 steel Substances 0.000 claims description 73
- 238000009434 installation Methods 0.000 claims description 17
- -1 polytetrafluoroethylene Polymers 0.000 claims description 11
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 11
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 11
- 238000004080 punching Methods 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 9
- 230000002787 reinforcement Effects 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
Landscapes
- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The application relates to the field of bridge pier columns, in particular to a protection method for existing viaduct pier column supports close to a deep foundation pit. Compared with the traditional pier stud protection method, the pier stud protection method has the advantages of small occupied space, short period and low cost, overcomes the influence of the restriction of surrounding environment, reduces the influence on the bridge structure to the greatest extent, reduces the maintenance cost and improves the working efficiency.
Description
Technical Field
The application relates to the field of bridge pier columns, in particular to a supporting and protecting method for existing viaduct pier columns close to a deep foundation pit.
Background
In recent years, with the synchronous rising of the automobile conservation amount and national economy, urban construction is rapidly developed, and the phenomenon of unreasonable planning may exist in the early stage of urban construction, so that a series of construction activities such as deep foundation pit excavation and the like are usually carried out beside a viaduct in the urban construction at present, and the reinforcement work of an overhead bridge pier column is particularly important during the deep foundation pit excavation. The existing viaduct pier stud reinforcing methods are various, but have the defects of high cost, long period, large influence on bridge structures, large occupied space, construction restriction by surrounding environment and low reliability and durability.
Disclosure of Invention
The application provides a method for protecting the support of the existing viaduct pier stud close to a deep foundation pit, which aims to solve the defects in the prior art.
The application is realized by the following technical scheme:
a supporting and protecting method for existing viaduct pier stud near deep foundation pit comprises the following steps,
step one: measuring and placing points on the installation positions of the cylindrical steel supports on the original bearing platforms of the viaduct pier columns; the number of the cylindrical steel supports is four, and the cylindrical steel supports surround the pier column for a circle;
step two: prefabricating a flange plate B which is the same as a flange plate A at the lower end of the cylindrical steel support in advance, wherein bolt hole positions of the flange plate B correspond to those of the flange plate A one by one, punching is carried out on an original bearing platform according to the prefabricated bolt hole positions of the flange plate B, and an anchor rod is required to be inserted and fixed immediately after punching of one hole; the four flange plates B are fixed on the original bearing platform according to the method;
step three: symmetrically fixing triangular brackets on two sides of an installation point of the cylindrical steel support respectively, wherein the triangular brackets are fixed on an original bearing platform through expansion bolts; the triangular bracket comprises three supporting rods, the upper ends of the three supporting rods are connected with a horizontal plate, and a hoist is fixed in the middle of the lower surface of the horizontal plate; prefabricating a cylindrical steel support, fixing a flange plate A at the bottom of the cylindrical steel support, and symmetrically welding two lifting lugs on the side surface of the upper part of the cylindrical steel support; respectively connecting transmission chains of hoisting hoists at two sides with lifting lugs at two sides of a cylindrical steel support, erecting the cylindrical steel support through the hoisting hoists, and fixing a flange A and a flange B together; in the process of erecting and fixing the four cylindrical steel supports, H-shaped steel beams are applied between the adjacent cylindrical steel supports;
step four: shoulder beams are erected on two cylindrical steel supports along the width direction of the bridge, and the length direction of the shoulder beams is along the width direction of the bridge; after the shoulder beam is placed at the installation position, the shoulder beam and the cylindrical steel support are spot-welded together;
step five: fixing a plurality of jacks on the shoulder beams, and sticking polytetrafluoroethylene supports on end covers at the top ends of the jacks; and pressing the jack, and stopping pressing when the polytetrafluoroethylene support contacts with the bottom of the bridge.
As a preferable scheme:
preferably, in the second step, the installation position of the cylindrical steel support avoids the original pile foundation position.
Preferably, in the second step, the punching depth is 300mm, and the hole diameter is 20mm.
Preferably, in the second step, the diameter of the bolt hole of the flange plate B is 21mm.
Preferably, in the third step, the hoisting block is a chain block or an electric block.
Preferably, in the third step, a limiting iron chain is fixed between the bottom ends of the supporting rods.
Preferably, the upper end of the supporting rod is provided with a connecting sheet, the position of the horizontal plate, which downwards corresponds to the supporting rod, is provided with two fixing sheets, the connecting sheet and the fixing sheets are respectively provided with a round hole, a screw rod penetrates through the round holes, and two ends of the screw rod are fixed through nuts.
Preferably, in the third step, the distance between the lifting lug and the top end of the cylindrical steel support is 2m.
Preferably, in the fifth step, the polytetrafluoroethylene support is adhered to the top end cover of the jack by using NSH super-strong structural adhesive.
Compared with the prior art, the application has the beneficial effects that: compared with the traditional pier column protection method, the pier column is supported and protected by the cylindrical steel support in a limited space, the reinforcement mode occupies small space, the influence of the restriction of surrounding environment is overcome, the reinforcement method is short in period and low in cost, the influence on a bridge structure is reduced to the greatest extent, the maintenance cost is reduced, and the working efficiency is improved.
Drawings
FIG. 1 is a schematic view of a longitudinal section structure of the application after installation;
FIG. 2 is a schematic view of the structure of a pair of cylindrical steel support measuring points in the step of the application;
FIG. 3 is a schematic view of the structure of the triangular bracket upright cylindrical steel support of the present application;
FIG. 4 is a schematic view of the structure of the tripod of the present application;
fig. 5 is an enlarged view of the joint of the support rods according to the present application.
In the figure, 1 original pile foundation, 2 pier stud, 3 original bearing platform, 4 cylindrical steel support, 5 flange plate A,6 triangular bracket, 7 support rod, 8 horizontal plate, 9 hoist, 10 lifting lug, 11 driving chain, 12H shaped steel girder, 13 shoulder beam, 14 jack, 15 limiting iron chain, 16 connecting sheet, 17 fixing sheet, 18 screw rod, 19 nut, 20 bridge, 21 polytetrafluoroethylene support.
Detailed Description
The following specific embodiments of the present application are provided, and it should be noted that the present application is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical scheme of the present application fall within the protection scope of the present application.
The application discloses a supporting and protecting method for an existing viaduct pier stud adjacent to a deep foundation pit, which comprises the following steps of:
step one: measuring the placement point and determining the installation position of the cylindrical steel support 4
Firstly, four cylindrical steel supports 4 are required to be distributed on an original bearing platform 3 of a viaduct pier stud 2 around the pier stud 2 in a circle, the installation positions of the cylindrical steel supports 4 are measured and placed according to design requirements, the installation positions of the cylindrical steel supports 4 are determined, and as shown in figure 2, the installation positions of the cylindrical steel supports 4 avoid the original pile foundation 1 position as far as possible. After the installation position of the cylindrical steel support 4 is determined, marking is performed.
Step two: flange plate B is installed
In order to prevent the deviation of installation, simultaneously also in order to simple to operate, prefabricated in advance and the same ring flange B of terminal surface ring flange A5 under the drum steel support 4, ring flange B's bolt hole site and ring flange A5's bolt hole site one-to-one, but ring flange B's bolt hole diameter is less than ring flange A5's bolt hole diameter 1mm.
According to the bolt hole site condition of prefabricated ring flange B, punch original cushion cap 3, the depth of punching 300mm, hole diameter 20mm, in every punching is done the bolt hole of ring flange B and the hole of punching is fixed with the stock insertion immediately, prevents to appear punching the deviation when carrying out next hole and beat and establish, causes the installation difficulty. The four flanges B are fixedly arranged on the original bearing platform 3 according to the method. The diameter of the bolt hole of the flange plate B is preferably 21mm.
Step three: fixedly mounted cylindrical steel support 4
The triangular supports 6 are symmetrically fixed on two sides of the installation point of the cylindrical steel support 4 respectively, each triangular support 6 comprises three supporting rods 7, the upper ends of the three supporting rods 7 are connected with a horizontal plate 8, and lifting hoists 9 are fixed in the middle of the lower surface of the horizontal plate 8, and the lifting hoists 9 can be chain hoists or electric hoists.
The tripod 6 is fixed on the original bearing platform 3 through expansion bolts, and in order to make the tripod 6 more stable, it is preferable that a limiting iron chain 15 is fixed between the bottom ends of the adjacent supporting rods 7 to prevent the tripod 6 from moving.
In order to properly adjust the inclination angle of the support rod 7 of the tripod 6, preferably, the upper end of the support rod 7 is hinged with the horizontal plate 8, specifically, a connecting sheet 16 is arranged at the upper end of the support rod 7, two fixing sheets 17 are arranged at the position of the horizontal plate 8, which corresponds to the support rod 7 downwards, round holes are formed in the connecting sheet 16 and the fixing sheets 17, a screw 18 penetrates through the round holes, and two ends of the screw 18 are fixed through nuts 19. Therefore, the inclination of the supporting rod 7 can be properly adjusted according to the construction condition, the upper end of the supporting rod 7 is fixed by using the nut 19 after the adjustment, and then the limiting iron chain 15 is fixed between the lower ends of the supporting rod 7, and the limiting iron chain 15 is used by using a common iron chain.
The cylindrical steel support 4 is prefabricated in a factory, the prefabricated cylindrical steel support 4 is a cylindrical steel column, a flange A5 is fixed at the bottom of the cylindrical steel support 4, two lifting lugs 10 are symmetrically welded on the side face of the upper part of the cylindrical steel support 4, and the distance between the lifting lugs 10 and the top end of the cylindrical steel support 4 is preferably 2m. The lifting lug 10 is made of round steel and can bear a pulling force of about 5 tons.
The transmission chains 11 of the hoisting hoists 9 at the two sides are respectively connected with the lifting lugs 10 at the two sides, the hoisting hoists 9 work, the cylindrical steel support 4 is slowly lifted and erected, the flange plate A5 is aligned with the flange plate B, and the flange plate A5 and the flange plate B are fixed together. The other three cylindrical steel supports 4 are erected and fixed in the same construction sequence. In the process of erecting and fixing the four cylindrical steel supports 4, horizontal H-shaped steel beams 12 are needed to be applied between the adjacent cylindrical steel supports 4 in time, the H-shaped steel beams 12 are positioned at the middle upper part of the cylindrical steel supports 4, the cylindrical steel supports 4 are vertical, and the four H-shaped steel beams connect the four cylindrical steel supports 4 into a whole to prevent the cylindrical steel supports 4 from toppling over.
Step four: shoulder beam 13 mounting
In the third step, the cylindrical steel supports 4 are formed integrally with each other, so that the stability is high, at this time, two shoulder beams 13 can be erected by using the cylindrical steel supports 4, and the shoulder beams 13 are arranged along the width direction of the bridge 20, so that the shoulder beams 13 are erected on the two cylindrical steel supports 4 along the width direction of the bridge 20, and two shoulder beams 13 are erected in total. Before erection, the shoulder beams 13 are tested, so that the bearing capacity of 5 tons of single shoulder beam 13 can be ensured, after the shoulder beam 13 passes the test, the shoulder beam 13 is pulled up, the shoulder beam 13 is placed between the two cylindrical steel supports 4, and the length direction of the shoulder beam 13 is along the width direction of the bridge 20. After the shoulder beam 13 is placed on the cylindrical steel support 4, the shoulder beam 13 and the cylindrical steel support 4 are spot welded together.
Step five: mounting jack 14
A plurality of jacks 14 are fixed on the shoulder beams 13, and polytetrafluoroethylene supports 21 are stuck on end covers at the top ends of the jacks 14. Preferably, NSH super strong structural adhesive is used to adhere the polytetrafluoroethylene support 21 to the top end cap of the jack 14. The jack 14 is pressed, and the pressing is stopped when the polytetrafluoroethylene support 21 at the upper end of the jack 14 is contacted with the bottom of the bridge 20.
The reinforcement mode of the application occupies small space, can finish the reinforcement work of the application on the original bearing platform 3 of the pier stud 2, is not influenced by the surrounding environment, has short reinforcement period and low cost, and basically has no influence on the original bridge structure. When a series of construction activities such as deep foundation pit excavation are performed beside the viaduct, if the bridge 20 generates downward pressure, the polytetrafluoroethylene support 21, the jack 14, the shoulder beam 13 and the cylindrical steel support 4 can disperse and bear the force, so that the pressure on the original pier column 2 of the bridge 20 is greatly reduced, and the original pier column 2 is protected.
After a series of construction activities such as deep foundation pit excavation and the like performed beside the viaduct are finished, the device is dismantled.
The above embodiment is only one of the preferred embodiments of the present application, and the ordinary changes and substitutions made by those skilled in the art within the scope of the present application should be included in the scope of the present application.
Claims (9)
1. A supporting and protecting method for existing viaduct pier studs close to a deep foundation pit is characterized by comprising the following steps: comprises the steps of,
step one: measuring and placing points on the installation positions of the cylindrical steel supports on the original bearing platforms of the viaduct pier columns; the number of the cylindrical steel supports is four, and the cylindrical steel supports surround the pier column for a circle;
step two: prefabricating a flange plate B which is the same as a flange plate A at the lower end of the cylindrical steel support in advance, wherein bolt hole positions of the flange plate B correspond to those of the flange plate A one by one, punching is carried out on an original bearing platform according to the prefabricated bolt hole positions of the flange plate B, and an anchor rod is required to be inserted and fixed immediately after punching of one hole; the four flange plates B are fixed on the original bearing platform according to the method;
step three: symmetrically fixing triangular brackets on two sides of an installation point of the cylindrical steel support respectively, wherein the triangular brackets are fixed on an original bearing platform through expansion bolts; the triangular bracket comprises three supporting rods, the upper ends of the three supporting rods are connected with a horizontal plate, and a hoist is fixed in the middle of the lower surface of the horizontal plate; prefabricating a cylindrical steel support, fixing a flange plate A at the bottom of the cylindrical steel support, and symmetrically welding two lifting lugs on the side surface of the upper part of the cylindrical steel support; respectively connecting transmission chains of hoisting hoists at two sides with lifting lugs at two sides of a cylindrical steel support, erecting the cylindrical steel support through the hoisting hoists, and fixing a flange A and a flange B together; in the process of erecting and fixing the four cylindrical steel supports, H-shaped steel beams are applied between the adjacent cylindrical steel supports;
step four: shoulder beams are erected on two cylindrical steel supports along the width direction of the bridge, and the length direction of the shoulder beams is along the width direction of the bridge; after the shoulder beam is placed at the installation position, the shoulder beam and the cylindrical steel support are spot-welded together;
step five: fixing a plurality of jacks on the shoulder beams, and sticking polytetrafluoroethylene supports on end covers at the top ends of the jacks; and pressing the jack, and stopping pressing when the polytetrafluoroethylene support contacts with the bottom of the bridge.
2. The method for protecting the support of the existing viaduct pier stud adjacent to the deep foundation pit according to claim 1, wherein the method comprises the following steps: in the second step, the installation position of the cylindrical steel support avoids the original pile foundation position.
3. The method for protecting the support of the existing viaduct pier stud adjacent to the deep foundation pit according to claim 1, wherein the method comprises the following steps: in the second step, the punching depth is 300mm, and the hole diameter is 20mm.
4. The method for protecting the support of the existing viaduct pier stud adjacent to the deep foundation pit according to claim 1, wherein the method comprises the following steps: in the second step, the diameter of the bolt hole of the flange plate B is 21mm.
5. The method for protecting the support of the existing viaduct pier stud adjacent to the deep foundation pit according to claim 1, wherein the method comprises the following steps: in the third step, the hoisting hoist is a chain hoist or an electric hoist.
6. The method for protecting the support of the existing viaduct pier stud adjacent to the deep foundation pit according to claim 1, wherein the method comprises the following steps: in the third step, a limiting iron chain is fixed between the bottom ends of the supporting rods.
7. The method for protecting the support of the existing viaduct pier stud adjacent to the deep foundation pit according to claim 1, wherein the method comprises the following steps: the upper end of the supporting rod is provided with a connecting sheet, the position of the horizontal plate, which downwards corresponds to the supporting rod, is provided with two fixing sheets, the connecting sheet and the fixing sheets are respectively provided with a round hole, a screw rod penetrates through the round holes, and two ends of the screw rod are fixed through nuts.
8. The method for protecting the support of the existing viaduct pier stud adjacent to the deep foundation pit according to claim 1, wherein the method comprises the following steps: in the third step, the distance between the lifting lug and the top end of the cylindrical steel support is 2m.
9. The method for protecting the support of the existing viaduct pier stud adjacent to the deep foundation pit according to claim 1, wherein the method comprises the following steps: in the fifth step, NSH super strong structural adhesive is adopted to adhere the polytetrafluoroethylene support to the top end cover of the jack.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310873699.1A CN116641321A (en) | 2023-07-17 | 2023-07-17 | Supporting and protecting method for existing viaduct pier stud close to deep foundation pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310873699.1A CN116641321A (en) | 2023-07-17 | 2023-07-17 | Supporting and protecting method for existing viaduct pier stud close to deep foundation pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116641321A true CN116641321A (en) | 2023-08-25 |
Family
ID=87625013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310873699.1A Pending CN116641321A (en) | 2023-07-17 | 2023-07-17 | Supporting and protecting method for existing viaduct pier stud close to deep foundation pit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116641321A (en) |
-
2023
- 2023-07-17 CN CN202310873699.1A patent/CN116641321A/en active Pending
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