CN112267373A - Partially unbonded grouting corrugated pipe prefabricated assembly connecting structure and construction method - Google Patents
Partially unbonded grouting corrugated pipe prefabricated assembly connecting structure and construction method Download PDFInfo
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- CN112267373A CN112267373A CN202011010735.4A CN202011010735A CN112267373A CN 112267373 A CN112267373 A CN 112267373A CN 202011010735 A CN202011010735 A CN 202011010735A CN 112267373 A CN112267373 A CN 112267373A
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- corrugated pipe
- main
- pier
- unbonded
- sleeve
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- 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
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/162—Connectors or means for connecting parts for reinforcements
- E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
- E04C5/165—Coaxial connection by means of sleeves
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/18—Spacers of metal or substantially of metal
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a partially unbonded grouting corrugated pipe prefabricated assembly connecting structure and a construction method, wherein the partially unbonded grouting corrugated pipe prefabricated assembly connecting structure comprises main ribs, metal corrugated pipes and sleeves, wherein the end parts of the main ribs are required to be anchored in a bearing platform or a capping beam; the metal corrugated pipe is pre-buried in the bearing platform or the capping beam, and dense fillers are pressed and filled in the metal corrugated pipe to realize anchoring connection with the main ribs; the main rib close to a certain length of the joint side in the metal corrugated pipe is coated with anti-corrosion lubricating grease, the sleeve with the corresponding length is sleeved outside the metal corrugated pipe, the two ends of the sleeve are subjected to water seal treatment by using flexible sealant, and the sleeve is fixed by adopting a spring clamp before pouring of a pier, so that a main rib non-bonding section is formed on the main rib. Compared with the prior art, the method can relieve stress concentration at the joint, prolong the yield length of the main reinforcement around the joint, improve the ductility and energy consumption capability of the prefabricated assembled pier, reduce the strain rate of the main reinforcement at the joint and improve the fatigue performance; the whole connecting structure is simple in construction, easy to operate, high in economical efficiency and convenient to popularize and apply.
Description
Technical Field
The invention relates to the technical field of bridge engineering, in particular to a partially unbonded grouting corrugated pipe prefabricated assembling connecting structure and a construction method.
Background
For the prefabricated assembled bridge, the performance of the connection between prefabricated parts is one of the most direct and key factors influencing the static and dynamic response of the bridge structure. The traditional grouting metal corrugated pipe connecting structure is favored by domestic and foreign scholars due to the characteristics of quick construction, good performance and low manufacturing cost, and is adopted by a plurality of construction units due to higher tolerance error.
However, based on the pseudo-static test and the vibration table test of the traditional grouting metal corrugated pipe connecting structure, the results show that: the plastic hinge length at the bottom of the prefabricated assembled pier connected by the traditional grouting metal corrugated pipe is smaller than that of a cast-in-place pier, and deformation is mainly concentrated at the joint position, so that the ductility and energy consumption of the prefabricated assembled pier connected by the grouting metal corrugated pipe are lower than those of the cast-in-place pier, and the prefabricated assembled pier connected by the grouting metal corrugated pipe is not suitable for being applied to piers in medium and high intensity earthquake regions.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a prefabricated assembly connecting structure and a construction method of a partially unbonded grouting corrugated pipe.
The purpose of the invention can be realized by the following technical scheme:
the invention discloses a partial unbonded grouting corrugated pipe prefabricated assembly connecting structure, which comprises main ribs, metal corrugated pipes and sleeves, wherein the concrete steps are as follows:
the end part of the main pier rib needs to be anchored in a bearing platform or a capping beam;
the metal corrugated pipe is pre-buried in the bearing platform or the capping beam, and dense fillers are pressed and filled in the metal corrugated pipe to realize anchoring connection with the main ribs;
the sleeve pipe cover is located on the main muscle, in the pier hoist and mount process, the main muscle is inserted corrugated metal pipe, the sleeve pipe is whole to be located corrugated metal pipe or the part extends to corrugated metal pipe outside, and main muscle unbonded section is in near seam crossing after pier hoist and mount are accomplished to this constitutes main muscle unbonded section on the main muscle for near main muscle strain evenly distributed of seam crossing.
Further, the length of the main rib unbonded section is 8-10 times of the diameter of the main rib.
Further, the non-bonding section of the main rib is coated with an anti-corrosion lubricating grease layer. Increase the non-adhesive performance and improve the corrosion resistance.
Furthermore, flexible sealant is arranged on the inner walls of the two ends of the sleeve to form water seal structures at the two ends.
Further, the flexible sealant is a paste sealant or a hot melt sealant.
Further preferably, the flexible sealant is a polyurethane sealant, a silicone sealant, for example.
Further, the dense filler is high-strength shrinkage-free cement mortar or ultrahigh-performance concrete.
Furthermore, a slurry outlet and a slurry pressing port are formed in the metal corrugated pipe, and after the main ribs are inserted into the metal corrugated pipe, the compact filler is pressed in through the slurry outlet and the slurry pressing port.
Further preferably, the sleeve may partially extend to the outside of the metal bellows to the pier plastic hinge region. And the main reinforcement in the plastic hinge area of the pier is subjected to non-bonding treatment, so that the damage condition of concrete in the plastic hinge area is reduced.
Furthermore, spring clamps are arranged at two ends of the sleeve, so that the sleeve is positioned on the main rib. The spring clamp is made by wrapping a layer of anti-skidding rubber layer outside the spring steel wire, and cuts off the straight line segment after the sleeve is positioned, so that the main reinforcement can enter the metal corrugated pipe conveniently.
Furthermore, the length of the anchor section of the main rib is not suitable to be less than 24 times of the diameter of the main rib, and the inner diameter of the metal corrugated pipe is preferably 40mm larger than the diameter of the main rib.
Furthermore, the inner diameter of the sleeve is slightly larger than the maximum diameter of the main rib, the length can be determined according to design requirements, and the manufacturing material can be steel or plastic.
Further, the metal corrugated pipe can be a steel strip corrugated pipe, a galvanized metal corrugated pipe or a steel pipe pressed corrugated pipe.
The construction method of the prefabricated assembled connecting structure of the partial unbonded grouting corrugated pipe comprises the following steps of:
s1: coating anti-corrosion lubricating grease on the preset position of the processed main rib, sleeving a sleeve with a corresponding length outside, performing water seal treatment on two ends of the sleeve by using flexible sealant, and fixing the sleeve by using a spring clamp;
s2: processing stirrups and binding a pier reinforcement cage, erecting a formwork and pouring pier concrete, maintaining for 15-35 days, pouring a bearing platform of a pre-embedded metal corrugated pipe, and splicing the bearing platform and a pile foundation;
s3: and hoisting the bridge pier above the bearing platform, inserting the main bridge pier ribs into the embedded metal corrugated pipes and centering, finally grouting into the metal corrugated pipes, and completing the assembly of the bridge pier and the capping beam for the frame pier or the bent frame pier.
Compared with the prior art, the invention has the following technical advantages:
1) under the effect of earthquake power, pier bottom and double column mound, framed bent pier mound top forms the plasticity hinge, pier and cushion cap, pier and bent cap junction seam open gradually, the pier owner muscle that traditional grout corrugated metal pipe connects reaches the yield rapidly, and main muscle is broken or core concrete conquassation appears along with the increase of horizontal force, and this technical scheme is because main muscle sets up behind the unbonded section, the reinforcing bar distributes comparatively evenly in this region meeting an emergency, the stress concentration of seam crossing has been alleviated, and the yield length extension of main muscle, therefore have better ductility performance and power consumption ability, the existence of unbonded section simultaneously can also reduce the main muscle percentage of strain in this region, the main muscle risk of taking place fatigue failure has been reduced.
2) The unbonded section is arranged on the main rib in the metal corrugated pipe, so that the ductility and the energy consumption of the pier can be improved, the fatigue performance of the main rib is improved, and meanwhile, the construction process is simple, easy to operate, high in economy and convenient to popularize and apply.
Drawings
Fig. 1 is a schematic structural view of the present invention used at the junction of a single pier and a cap.
Fig. 2 is a cross-sectional view of a pier section i-i.
FIG. 3 is a sectional view of the top surface II-II of the platform.
Fig. 4 is a detailed view of a partially unbonded grouted bellows construction.
Fig. 5 is a structural view of arrangement of spring clips at two ends of a sleeve.
Reference numbers in the figures: the structure comprises a main rib 1, a sleeve 2, a metal corrugated pipe 3, a stirrup 4, a pier 5, a bearing platform 6, a spring clamp 7, a main rib unbonded section 8 and a main rib bonded section 9.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Examples
In the embodiment of the invention, the preparation before construction is as follows: and cleaning the construction site according to a design drawing, and organizing construction materials, machinery and personnel in place.
The invention discloses a prefabricated assembly connecting structure of a part of unbonded grouting corrugated pipes, which comprises main ribs 1, metal corrugated pipes 3 and sleeves 2, and is shown in figure 1. This embodiment not only can improve the ductility ability and the power consumption ability of pier through setting up the unbonded section to the main muscle in the corrugated metal pipe, improves main muscle fatigue performance, and the simultaneous working process is simple, easily operates, and economic nature is strong, facilitate promotion and application.
One end of the main reinforcement 1 is anchored in the bearing platform or the cover beam. The metal corrugated pipe 3 is pre-embedded in a bearing platform or a cover beam, and dense filler is filled in the metal corrugated pipe 3 to realize anchoring connection with the main bar 1. When the concrete material is selected, the dense filler is high-strength non-shrinkage cement mortar or ultrahigh-performance concrete. The metal corrugated pipe 3 is provided with a slurry outlet and a slurry pressing port, and the main rib 1 is inserted into the metal corrugated pipe 3 and then is pressed in through the slurry outlet and the slurry pressing port to realize the pressing-in of the dense filler. When the type is selected specifically, the length of the anchoring section of the main rib 1 is not smaller than 24 times of the diameter of the main rib, and the inner diameter of the metal corrugated pipe is 40mm larger than the diameter of the main rib. The length of the main rib unbonded section 8 is 8-10 times of the diameter of the main rib 1. The main rib unbonded section 8 is coated with an anticorrosion lubricating grease layer, so that the unbonded performance is improved, and the anticorrosion performance is improved. In specific implementation, flexible sealant is arranged on the inner walls of the two ends of the casing 2 to form water seal structures at the two ends. The flexible sealant is paste sealant or hot melt sealant, such as polyurethane sealant or silicone sealant. The metal corrugated pipe 3 may be a steel strip corrugated pipe, a galvanized metal corrugated pipe or a steel pipe pressed corrugated pipe.
2 covers of sleeve pipe are located on the main muscle 1, 5 hoist and mount in-process of pier, main muscle 1 inserts corrugated metal pipe 3, 2 whole are located corrugated metal pipe 3 or the part extends to corrugated metal pipe 3 outsidely, 5 hoist and mount of pier are accomplished back main muscle unbonded section 8 and are in near seam crossing to this constitutes main muscle unbonded section 8 on main muscle 1, see figure 4, make near seam crossing main muscle 1 meet an emergency evenly distributed, 2 parts of sleeve pipe extend to 3 outsides of corrugated metal pipe to pier plasticity hinge district, do not bondless processing to pier plasticity hinge district main muscle, alleviate the damage condition of plasticity hinge district concrete. The sleeve 2 is provided with spring clips 7 at both ends, see fig. 5, to position the sleeve 2 on the main bar 1. The spring clamp 7 is made by wrapping a layer of anti-slip rubber layer outside the spring steel wire, and cuts off the straight line segment after the positioning of the sleeve is finished, so that the main reinforcement can enter the metal corrugated pipe conveniently. When the type is specifically selected, the inner diameter of the sleeve 2 is slightly larger than the maximum diameter of the main reinforcement 1, the length can be determined according to design requirements, and the manufacturing material can be steel or plastic.
In the embodiment of the invention, the stirrup 4 is a hot-rolled ribbed steel bar, and the end part of the stirrup is made into a 135-degree hook.
The construction method of the prefabricated assembling connection structure of the partial unbonded grouting corrugated pipe in the embodiment comprises the following steps:
s1: coating anti-corrosion lubricating grease on the preset position of the processed main rib 1, coating a sleeve 2 with a corresponding length outside, performing water sealing treatment on two ends of the sleeve 2 by using flexible sealant, and fixing the sleeve 2 by using a spring clamp 7;
s2: processing stirrups 4 and binding a reinforcement cage of a pier 5, referring to fig. 2 and fig. 3, pouring concrete of the pier 5 by a formwork to form a main reinforcement bonding section 9, maintaining for 15-35 days, pouring a bearing platform 6 with a metal corrugated pipe 3 embedded, and assembling the bearing platform 6 with a pile foundation;
s3: and hoisting the pier 5 above the bearing platform 6, inserting the main pier rib 1 into the embedded metal corrugated pipe 3 and centering, and finally grouting into the metal corrugated pipe 3 to assemble the pier and the capping beam for the frame pier or the bent frame pier.
Under the effect of earthquake power, pier bottom and double column mound, framed bent pier mound top forms the plasticity hinge, pier and cushion cap, pier and bent cap junction seam open gradually, the pier owner muscle that traditional grout corrugated metal pipe connects reaches the yield rapidly, and main muscle is broken or core concrete conquassation appears along with the increase of horizontal force, and this technical scheme is because main muscle sets up behind the unbonded section, the reinforcing bar distributes comparatively evenly in this region meeting an emergency, the stress concentration of seam crossing has been alleviated, and the yield length extension of main muscle, therefore have better ductility performance and power consumption ability, the existence of unbonded section simultaneously can also reduce the main muscle percentage of strain in this region, the main muscle risk of taking place fatigue failure has been reduced.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. The utility model provides a connection structure is assembled in prefabrication of part unbonded grout bellows which characterized in that includes:
the end part of the main pier rib (1) is anchored in the bearing platform or the capping beam;
the metal corrugated pipe (3) is embedded in the bearing platform or the cover beam, and dense fillers are filled in the metal corrugated pipe (3) in a pressing mode to realize anchoring connection with the main ribs (1);
sleeve pipe (2), the cover is located on main muscle (1), pier (5) hoist and mount in-process, main muscle (1) are inserted corrugated metal pipe (3), sleeve pipe (2) are all located corrugated metal pipe (3) or the part extends to pier (5) plasticity hinge district, and main muscle unbonded area (8) are in near seam crossing after pier (5) hoist and mount are accomplished to this constitutes main muscle unbonded area (8) on main muscle (1) for near main muscle (1) of seam crossing meet an emergency evenly distributed.
2. The partially unbonded grouting corrugated pipe prefabrication and assembly connecting structure of claim 1, wherein the length of the main rib unbonded section (8) is 8-10 times of the diameter of the main rib (1).
3. The prefabricated assembly connecting structure of the partially unbonded grouting corrugated pipe as claimed in claim 1, wherein the main rib unbonded section (8) is coated with an anticorrosive grease layer.
4. The partially unbonded grouting corrugated pipe prefabrication and assembly connecting structure as claimed in claim 1, wherein flexible sealant is arranged on the inner walls of the two ends of the sleeve (2) to form water sealing structures at the two ends.
5. The partially unbonded grouting corrugated pipe prefabrication and assembly connecting structure as claimed in claim 1, wherein the flexible sealant is a paste sealant or a hot melt sealant.
6. The partially unbonded grouting corrugated pipe prefabrication and assembly connecting structure as claimed in claim 1, wherein the dense filler is high-strength shrinkage-free cement mortar or ultrahigh-performance concrete.
7. The partially unbonded grouting corrugated pipe prefabrication and assembly connecting structure as claimed in claim 6, wherein a grout outlet and a grout pressing outlet are formed in the metal corrugated pipe (3), and after the main rib (1) is inserted into the metal corrugated pipe (3), the pressing-in of the dense filler is realized through the grout outlet and the grout pressing outlet.
8. The partially unbonded grouting corrugated pipe prefabrication and assembly connecting structure as claimed in claim 1, wherein the anchoring section length of the main pier rib (1) is not less than 24 times of the diameter of the main pier rib (1), and the inner diameter of the metal corrugated pipe is preferably 40mm larger than the diameter of the main pier rib (1).
9. The partially unbonded grouting corrugated pipe prefabrication and assembly connecting structure as claimed in claim 1, wherein spring clamps are arranged at two ends of the sleeve (2) to position the sleeve (2) on the main rib (1).
10. A construction method for a partially unbonded grouting corrugated pipe prefabricated assembling connection structure is characterized by comprising the following steps:
s1: coating anti-corrosion lubricating grease on the preset position of the processed main rib (1), sleeving a sleeve (2) with a corresponding length outside, performing water sealing treatment on two ends of the sleeve (2) by using flexible sealant, and fixing the sleeve (2) by using a spring clamp (7);
s2: processing stirrups (4), binding a reinforcement cage of the pier (5), erecting a formwork, pouring concrete of the pier (5), maintaining for 15-35 days, pouring a bearing platform (6) of the embedded metal corrugated pipe (3), and splicing the bearing platform (6) and a pile foundation;
s3: hoisting the pier (5) to the position above the bearing platform (6), inserting the main pier ribs (1) into the pre-embedded metal corrugated pipe (3) and centering, and finally grouting into the metal corrugated pipe (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010735.4A CN112267373A (en) | 2020-09-23 | 2020-09-23 | Partially unbonded grouting corrugated pipe prefabricated assembly connecting structure and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011010735.4A CN112267373A (en) | 2020-09-23 | 2020-09-23 | Partially unbonded grouting corrugated pipe prefabricated assembly connecting structure and construction method |
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| Publication Number | Publication Date |
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| CN112267373A true CN112267373A (en) | 2021-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011010735.4A Pending CN112267373A (en) | 2020-09-23 | 2020-09-23 | Partially unbonded grouting corrugated pipe prefabricated assembly connecting structure and construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113373798A (en) * | 2021-05-14 | 2021-09-10 | 同济大学 | Prefabricated assembled pier and connecting method thereof |
| CN113882283A (en) * | 2021-08-29 | 2022-01-04 | 北京工业大学 | Existing pier seismic transformation construction method based on low-damage concept |
| CN114000656A (en) * | 2021-11-29 | 2022-02-01 | 同济大学 | Partially unbonded grouting sleeve prefabricated assembly connecting structure and construction method |
-
2020
- 2020-09-23 CN CN202011010735.4A patent/CN112267373A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113373798A (en) * | 2021-05-14 | 2021-09-10 | 同济大学 | Prefabricated assembled pier and connecting method thereof |
| CN113373798B (en) * | 2021-05-14 | 2022-09-20 | 同济大学 | Prefabricated assembled pier and connecting method thereof |
| CN113882283A (en) * | 2021-08-29 | 2022-01-04 | 北京工业大学 | Existing pier seismic transformation construction method based on low-damage concept |
| CN114000656A (en) * | 2021-11-29 | 2022-02-01 | 同济大学 | Partially unbonded grouting sleeve prefabricated assembly connecting structure and construction method |
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