CN115126016A - Construction method for connecting underpinned beam and existing pier - Google Patents
Construction method for connecting underpinned beam and existing pier Download PDFInfo
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- CN115126016A CN115126016A CN202210900515.1A CN202210900515A CN115126016A CN 115126016 A CN115126016 A CN 115126016A CN 202210900515 A CN202210900515 A CN 202210900515A CN 115126016 A CN115126016 A CN 115126016A
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- 238000010276 construction Methods 0.000 title claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 50
- 239000010959 steel Substances 0.000 claims abstract description 50
- 238000009424 underpinning Methods 0.000 claims abstract description 45
- 238000005553 drilling Methods 0.000 claims abstract description 32
- 239000003292 glue Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000004873 anchoring Methods 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 239000007943 implant Substances 0.000 claims abstract description 4
- 210000002105 tongue Anatomy 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 description 8
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 7
- 238000005336 cracking Methods 0.000 description 6
- 210000002435 tendon Anatomy 0.000 description 5
- 238000005266 casting Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D37/00—Repair of damaged foundations or foundation structures
-
- 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
- E02D5/22—Piles
- E02D5/64—Repairing piles
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention provides a construction method for connecting a underpinned beam and an existing pier, which comprises the following steps: chiseling a plurality of uniformly arranged tongue-and-grooves on the side surface of an existing bridge pier bearing platform; drilling the rabbet to obtain a plurality of bar planting holes, detecting the positions of the existing steel bars in the existing pier bearing platform by using a steel bar detector during drilling, and adjusting the positions of the drilled holes if conflicts exist so as to avoid the existing steel bars; step three, after the bar planting holes are finished, cleaning the bar planting holes by using a brush and clean compressed air; pouring bar-planting glue into the bar-planting holes, selecting connecting bars, extending one ends of the connecting bars into the bar-planting holes, hammering the connecting bars to implant the connecting bars, and anchoring the other ends of the connecting bars on the underpinned bars; and fifthly, pouring concrete of the underpinned beam after the bar-planting glue forms strength. The construction method has simple procedures and easy construction, and solves the technical problems that the underpinning beam is not connected with the existing bridge pile sufficiently and is easy to cause safety accidents.
Description
Technical Field
The invention relates to the technical field of pile foundation underpinning construction, in particular to a underpinning beam and existing pier connection construction method.
Background
With the demand of economic development in China, the demand of urban traffic increases suddenly, the original ground traffic design cannot completely meet the traffic of residents, and the application of underground traffic is gradually popularized. In the process of constructing the underground railway, the ground surface building is inevitably influenced, particularly, the pile foundations of the building are radially arranged in the route selection of the tunnel, and at the moment, the load borne by the part of the pile foundations needs to be transmitted to the pile foundations outside the tunnel construction range through a newly-built underpinning structure by adopting a pile foundation underpinning technology.
In the existing pile foundation underpinning construction process, the connection steel bars are implanted into the old bearing platform, the construction convenience is mainly considered, usually, a plurality of steel bar implanting holes are drilled in the same operation direction and steel bars are implanted, then a plurality of steel bar implanting holes are drilled in the other operation direction and the steel bars are implanted until the steel bar implanting on the whole old bearing platform is completed, the implanted steel bars are not anchored with the underpinning steel bars in the underpinning beam, the construction method has large influence on the structural strength and the stability of the pile foundation, and safety accidents are easy to occur. Therefore, a new technical solution is needed to solve at least one of the above problems.
Disclosure of Invention
In view of the above disadvantages, an object of the present invention is to provide a method for connecting a underpinning girder with an existing bridge pier, which aims to solve the technical problems that the connection between the underpinning girder and the existing bridge pile is not secure enough and is easy to cause safety accidents.
In order to achieve the technical purpose and achieve the technical requirements, the invention adopts the technical scheme that:
a construction method for connecting a underpinned beam with an existing pier comprises the following steps:
chiseling a plurality of uniformly arranged tongues and grooves on the side surface of an existing bridge pier bearing platform;
drilling at the concave-convex positions of the grooves and tongues to obtain a plurality of bar planting holes, detecting the positions of the existing steel bars in the existing bridge pier bearing platform by using a steel bar detector during drilling, and adjusting the positions of the drilled holes if collision exists so as to avoid the existing steel bars;
step three, after the bar planting holes are finished, cleaning the bar planting holes by using a brush and clean compressed air;
step four, pouring bar-planting glue into the bar-planting holes, selecting connecting bars, extending one ends of the connecting bars into the bar-planting holes, hammering the connecting bars to implant the connecting bars, and anchoring the other ends of the connecting bars on the underpinning bars;
and fifthly, pouring concrete of the underpinned beam after the bar-planting glue forms strength.
Preferably, in the second step, during drilling, drilling is performed at two positions with different heights, opposite to each other, of the existing pier bearing platform, and the height difference between the two positions is not less than 100 mm.
And as a preferred technical scheme, in the step two, simultaneous or continuous drilling on the same side of the existing pier bearing platform is avoided during drilling, simultaneous drilling on adjacent or opposite holes is avoided, and the structure of the existing pier bearing platform is prevented from being damaged due to simultaneous impact on the same side of the existing pier bearing platform.
As the preferred technical scheme, the bar planting holes are arranged in a staggered mode according to a quincunx shape, and after connecting steel bars are implanted into the bar planting holes, the bar planting holes are connected with the underpinning beam more firmly and better in continuity.
As the preferred technical scheme, the distance between adjacent bar planting holes is not less than 5 the diameter of the bar planting holes, and the distance between the bar planting holes is not too small, so that not only are connecting steel bars wasted, but also stress is too concentrated, and the risk of cracking is increased.
According to the preferable technical scheme, the distance between the rib planting holes and the edge line of the existing pier bearing platform is not less than 2.5, and the corners of the existing pier bearing platform are prevented from being damaged.
As the preferred technical scheme, the bar planting holes are formed along four side surfaces of the existing pier bearing platform, so that the connection strength of the underpinning beam and the connecting steel bars is further improved.
As the preferred technical scheme, the connecting reinforcing steel bars and one end anchored by the underpinning reinforcing steel bars are provided with bent parts, the bent parts hook the underpinning reinforcing steel bars, the connecting reinforcing steel bars are connected with the underpinning reinforcing steel bars more firmly, and the strength of the underpinning beam is improved.
As the preferred technical scheme, the underpinning reinforcing steel bars are arranged around the existing pier bearing platform, the structure is more reasonable, the overall strength is higher after pouring, and the impact resistance is better.
As an optimal technical scheme, the bar planting glue adopts A-level bar planting glue, the formed strength is higher, and the connecting steel bars are firmer after being implanted.
The invention has the beneficial effects that:
in order to improve the strength of the underpinned beam after casting, the connecting steel bars and the underpinned steel bars in the underpinned beam are anchored and then cast, so that the underpinned beam after casting has higher strength, better connecting strength with the existing bridge pier and enhanced integral impact resistance.
Drawings
FIG. 1 is a flow chart of a construction process according to an embodiment of the present invention;
FIG. 2 is a block diagram of one embodiment provided by the present invention;
FIG. 3 is a cross-sectional view taken along line I-I of FIG. 2;
FIG. 4 is a sectional view II-II of FIG. 2;
FIG. 5 is a block diagram of a tongue and groove of one embodiment provided by the present invention;
FIG. 6 is a structural view of a connecting bar according to an embodiment of the present invention;
in fig. 1 to 6, 1, an existing pier cap; 101. a tongue-and-groove; 102. planting tendon holes; 2. underpinning the beam; 3. connecting reinforcing steel bars; 301. a bending section; 4. and (5) underpinning the steel bars.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if the terms "top", "bottom", "left", "right", "front", "back", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description of the present invention, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms described above will be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1 to 6, the present invention provides a method for constructing a underpinned girder connected to an existing pier, comprising the steps of:
firstly, chiseling a plurality of uniformly arranged grooves and tongues 101 on the side surface of an existing bridge pier bearing platform 1, wherein the grooves and tongues 101 are transversely arranged, and the grooves and tongues 101 enhance the direct combination degree and the bond coating effect of the underpinning beam 2 and the existing bridge pier bearing platform 1, so that the underpinning beam 2 is more tightly connected with the existing bridge pier bearing platform 1 after pouring;
drilling holes in the concave-convex positions of the rabbet 101 by using an electric impact drill to obtain a plurality of bar planting holes 102, namely drilling holes in the concave parts or the convex parts of the rabbet 101, detecting the positions of the existing steel bars in the existing bridge pier bearing platform 1 by using a steel bar detector during drilling, and adjusting the drilling positions if collision exists so as to avoid the existing steel bars, wherein the rabbet 101 plays a role of reinforcing bars during drilling, so that cracks around holes are prevented from being diffused, and the surface quality after drilling is improved;
step three, after the bar planting holes 102 are finished, cleaning the bar planting holes 102 by using a brush and clean compressed air;
pouring bar-planting glue into the bar-planting holes 102, selecting connecting steel bars 3, extending one ends of the connecting steel bars 3 into the bar-planting holes 102, hammering the connecting steel bars 3 to implant the connecting steel bars 3, anchoring the other ends of the connecting steel bars 3 to underpinned steel bars 4, arranging underpinned steel bars 4 in underpinned beams 2, and anchoring the connecting steel bars 3 and the underpinned steel bars 4 to form a firmer and more stable steel bar network by the connecting steel bars 3 and the underpinned steel bars 4, wherein the strength of the whole poured beam is higher, the impact resistance is better, and further, one ends of the connecting steel bars 3, which are far away from the bar-planting holes 102, are coated with the bar-planting glue and anchored with the underpinned steel bars 4 by the bar-planting glue;
and fifthly, pouring concrete of the underpinning beam 2 after the bar-planting glue forms strength, and wrapping the existing pier bearing platform 1 by the underpinning beam 2.
The construction method effectively improves the construction step sequence of the underpinning beam 2 connected with the existing bridge pier, makes the specifications for the reinforcing rib step, provides guarantee for the safety of underpinning of the pile foundation, and solves the technical problems that the underpinning beam 2 is not safe enough to be connected with the existing bridge pier and safety accidents are easy to occur.
As shown in fig. 1 to 6, in some embodiments, during drilling in the second step, drilling is performed at two positions with different heights on two opposite sides of the existing pier bearing platform 1, wherein the height difference between the two positions is not less than 100mm, and further, during drilling in the second step, simultaneous or continuous drilling on the same side of the existing pier bearing platform 1 is avoided, and simultaneous drilling of adjacent or opposite holes is avoided.
In the prior art, a plurality of bar planting holes 102 are usually drilled and steel bars are implanted in the same operation direction, then a plurality of bar planting holes 102 are drilled and steel bars are implanted in the other operation direction, so that the defects are great, the surface impact force on the existing pier bearing platform 1 is too large by construction on the same side, resonance is easily formed on the same side, the problems of surface cracking, falling and the like are easily caused, and the structure of the existing pier bearing platform 1 is seriously damaged, therefore, the drilling is further carried out on two sides opposite to the existing pier bearing platform 1, the stress of the existing pier bearing platform 1 is more balanced, the risk of surface cracking of the existing pier bearing platform 1 is greatly reduced, the positions of holes on one side and the other side are at different heights to form a height difference, the risk of internal cracking is increased when the drilling is carried out at the same height, and the internal cracking caused by the drilling can be prevented by forming the height difference, and the height difference is not less than 100mm, if the height difference is less than 100mm, the existing pier bearing platform 1 can not crack due to a large probability in actual operation, after repeated research, the problem that the existing pier bearing platform 1 can not crack as long as the height difference is not less than 100mm is found, and then the numerical value of the height difference is specifically determined according to the design requirements of the number of the connecting steel bars 3 and the like.
As shown in fig. 1-6, in some embodiments, the tendon-embedding holes 102 are arranged in a staggered manner in a quincunx manner, after the connection tendons 3 are embedded in the tendon-embedding holes 102, the connection with the underpinning beam 2 is firmer, taking the first row on the left as an example, the first row is composed of a plurality of tendon-embedding holes 102 which are uniformly and linearly arranged, the second row adjacent to the first row is composed of a plurality of tendon-embedding holes 102 which are uniformly and linearly arranged, the first row and the second row are arranged in a staggered manner, the tendon-embedding holes 102 behind are repeatedly arranged according to the rule of the first row and the second row, the number of the tendon-embedding holes 102 in the first row is 1 more than that of the tendon-embedding holes 102 in the second row, so that 5 tendon-embedding holes 102 in every three rows form a quincunx manner, so that the tendon network formed by the connection tendons 3 has a reasonable stress structure, the connection strength with the underpinning beam 2 after being poured, and the overall impact resistance is stronger.
As shown in fig. 1 to 6, in some embodiments, the distance between adjacent tendon-embedding holes 102 is not less than 5 diameters of the tendon-embedding holes 102, and the distance between the tendon-embedding holes 102 is not too small, which not only wastes the connecting steel bars 3, but also causes too concentrated stress, which increases the risk of cracking.
As shown in fig. 1 to 6, in some embodiments, the distance between the tendon-embedded holes 102 and the edge line of the existing pier bearing platform 1 is not less than 2.5, the diameter of the tendon-embedded holes 102 is a rectangular structure, four corners of the existing pier bearing platform 1 are easily damaged by impact during drilling, and the edge line between the connecting steel bars 3 and the existing pier bearing platform 1 is not less than 2.5, the diameter of the tendon-embedded holes 102 is ensured to be not damaged during drilling, so that the corners of the existing pier bearing platform 1 are not damaged.
As shown in fig. 1 to 6, in some embodiments, the grade a bar-planting glue is adopted as the bar-planting glue, and the grade a bar-planting glue meets the requirements of the germanium glue fixation specification for automobile structure engineering, i.e., JGT 340-2011.
As shown in fig. 1 to 6, in some embodiments, the tendon-embedded holes 102 are disposed along four sides of the existing pier cap 1, the existing pier cap 1 is a rectangular parallelepiped structure, and four sides of the existing pier cap are in contact with the underpinning beam 2, so that the tendon-embedded holes 102 are disposed on four sides of the existing pier cap and the connecting tendons 3 are embedded in the existing pier cap.
Further, connecting reinforcement 3 with the one end of underpinning 4 anchor of reinforcing bar is equipped with kink 301, kink 301 catches on underpinning reinforcing bar 4, and kink 301 buckles and catches on underpinning reinforcing bar 4 around underpinning reinforcing bar 4, and kink 301 scribbles the bar planting and glues, can show promotion anchor effect, connects inseparabler, underpinning reinforcing bar 4 centers on existing pier cushion cap 1 sets up, and underpinning reinforcing bar 4 forms the rectangle structure like this, surrounds existing pier cushion cap 1, and existing pier cushion cap 1 is more with the joint strength of underpinning roof beam 2 after the pouring, and the wholeness is better, and difficult separation after the pouring can not cause phenomenons such as staggered floor to make bulk strength higher, impact resistance is better.
The above examples are given for the purpose of illustrating the invention in a clear and non-limiting manner, and it will be apparent to those skilled in the art that many more modifications and variations can be made in the above-described embodiments without departing from the spirit and scope of the invention.
Claims (10)
1. A construction method for connecting a underpinned beam with an existing pier is characterized by comprising the following steps:
chiseling a plurality of uniformly arranged tongues and grooves on the side surface of an existing bridge pier bearing platform;
drilling at the concave-convex positions of the grooves and tongues to obtain a plurality of bar planting holes, detecting the positions of the existing steel bars in the existing bridge pier bearing platform by using a steel bar detector during drilling, and adjusting the positions of the drilled holes if collision exists so as to avoid the existing steel bars;
step three, after the bar planting holes are finished, cleaning the bar planting holes by using a brush and clean compressed air;
step four, pouring bar-planting glue into the bar-planting holes, selecting connecting bars, extending one ends of the connecting bars into the bar-planting holes, hammering the connecting bars to implant the connecting bars, and anchoring the other ends of the connecting bars on the underpinning bars;
and fifthly, pouring concrete of the underpinned beam after the bar-planting glue forms strength.
2. The underpinning beam and existing pier connection construction method according to claim 1, wherein during drilling in the second step, drilling is performed at two positions with different heights on two opposite sides of the existing pier bearing platform, and the height difference between the two positions is not less than 100 mm.
3. The underpinning girder and existing pier connection construction method according to claim 1, wherein in the second step, during drilling, simultaneous or continuous drilling on the same side of the existing pier bearing platform is avoided, and simultaneous drilling on adjacent or opposite holes is avoided.
4. The method for constructing a connection between an underpinned girder and an existing pier as claimed in claim 1, wherein the tendon-planting holes are arranged in a quincunx staggered manner.
5. The construction method for connecting a underpinned beam and an existing pier as claimed in claim 4, wherein the distance between adjacent rib-embedded holes is not less than 5 rib-embedded holes.
6. The construction method for connecting the underpinned beam and the existing pier as claimed in claim 5, wherein the distance between the rib planting holes and the edge line of the existing pier bearing platform is not less than 2.5 rib planting hole diameters.
7. The method for constructing a bridge pier joint between an underpinned girder and an existing bridge pier as claimed in claim 1, wherein the tendon-embedded holes are formed along four side surfaces of the existing bridge pier abutment.
8. The method for constructing a connection between an underpinning beam and an existing pier as claimed in claim 7, wherein a bent portion is formed at one end of the connecting steel bar anchored to the underpinning steel bar, and the bent portion hooks the underpinning steel bar.
9. The method of claim 8, wherein the underpinning steel bars are arranged around the pier abutment.
10. The underpinning beam and existing pier connection construction method according to any one of claims 1-9, wherein the bar planting glue is A-grade bar planting glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210900515.1A CN115126016A (en) | 2022-07-28 | 2022-07-28 | Construction method for connecting underpinned beam and existing pier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210900515.1A CN115126016A (en) | 2022-07-28 | 2022-07-28 | Construction method for connecting underpinned beam and existing pier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115126016A true CN115126016A (en) | 2022-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210900515.1A Withdrawn CN115126016A (en) | 2022-07-28 | 2022-07-28 | Construction method for connecting underpinned beam and existing pier |
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| Country | Link |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105672347A (en) * | 2016-01-25 | 2016-06-15 | 济南轨道交通集团有限公司 | Structure of prefabricated pile-plate brackets for underpinning existing pile foundations through shield tunneling and construction method |
| CN109372011A (en) * | 2018-12-03 | 2019-02-22 | 中铁三局集团有限公司 | Large-volume prestressed beam underpinning structure and the method for carrying out pile foundation underpinning with the structure |
| CN209760290U (en) * | 2019-02-23 | 2019-12-10 | 重庆三峡学院 | Full-covering type pile foundation underpinning node |
| CN112411613A (en) * | 2020-10-30 | 2021-02-26 | 中铁五局集团有限公司 | Underpinning beam construction method in pile foundation underpinning construction |
-
2022
- 2022-07-28 CN CN202210900515.1A patent/CN115126016A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105672347A (en) * | 2016-01-25 | 2016-06-15 | 济南轨道交通集团有限公司 | Structure of prefabricated pile-plate brackets for underpinning existing pile foundations through shield tunneling and construction method |
| CN109372011A (en) * | 2018-12-03 | 2019-02-22 | 中铁三局集团有限公司 | Large-volume prestressed beam underpinning structure and the method for carrying out pile foundation underpinning with the structure |
| CN209760290U (en) * | 2019-02-23 | 2019-12-10 | 重庆三峡学院 | Full-covering type pile foundation underpinning node |
| CN112411613A (en) * | 2020-10-30 | 2021-02-26 | 中铁五局集团有限公司 | Underpinning beam construction method in pile foundation underpinning construction |
Non-Patent Citations (1)
| Title |
|---|
| 李棋: "《桥梁桩墩式基础加固处理关键技术研究》", 《山西建筑》, vol. 44, no. 33, pages 154 - 155 * |
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Application publication date: 20220930 |