CN114000656A - Partially unbonded grouting sleeve prefabricated assembly connecting structure and construction method - Google Patents
Partially unbonded grouting sleeve prefabricated assembly connecting structure and construction method Download PDFInfo
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- CN114000656A CN114000656A CN202111430337.2A CN202111430337A CN114000656A CN 114000656 A CN114000656 A CN 114000656A CN 202111430337 A CN202111430337 A CN 202111430337A CN 114000656 A CN114000656 A CN 114000656A
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- 238000010276 construction Methods 0.000 title claims abstract description 16
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 105
- 230000009471 action Effects 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 239000000565 sealant Substances 0.000 claims abstract description 13
- 239000004519 grease Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000000853 adhesive Substances 0.000 claims abstract description 8
- 230000001070 adhesive effect Effects 0.000 claims abstract description 8
- 230000001050 lubricating effect Effects 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 46
- 239000010959 steel Substances 0.000 claims description 46
- 230000002787 reinforcement Effects 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 30
- 210000002435 tendon Anatomy 0.000 claims description 21
- 238000004873 anchoring Methods 0.000 claims description 19
- 239000011440 grout Substances 0.000 claims description 18
- 230000035939 shock Effects 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims description 5
- 239000004567 concrete Substances 0.000 claims description 4
- 238000009415 formwork Methods 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 229910000975 Carbon steel Inorganic materials 0.000 description 3
- 229910001141 Ductile iron Inorganic materials 0.000 description 3
- 239000010962 carbon steel Substances 0.000 description 3
- 239000012943 hotmelt Substances 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 238000009417 prefabrication Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
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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
-
- 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
- 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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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to the technical field of bridge engineering, in particular to a partially unbonded grouting sleeve prefabricated assembly connecting structure and a construction method. The invention coats a layer of anti-corrosive lubricating grease on the outwards extending reinforcing steel bar of a bearing platform with a certain length in the grouting sleeve, coats the sleeve with a corresponding length, and uses flexible sealant to carry out water sealing treatment on two ends of the sleeve so as to enable the outwards extending reinforcing steel bar of the bearing platform in the grouting sleeve to form a reinforcing steel bar non-adhesive section with a certain length. The invention not only ensures the connection stress of the pier and the bearing platform under normal use, but also can improve the energy consumption capability of the pier through the sliding friction of the outward extending reinforcing steel bars of the bearing platform in the grouting sleeve under the action of an earthquake. Meanwhile, the whole system has the advantages of simple structure, convenience in construction, high economical efficiency and the like, and is 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 sleeve prefabricated assembly connecting structure and a construction method.
Background
With the application of the prefabrication and assembly technology to the bridge substructure, the connection structure of the splicing seams of the piers becomes a key technical problem when the section assembly piers are applied to a high earthquake danger area. The grouting sleeve connection can be used for connecting prefabricated assembled piers and bearing platforms, piers and capping beams or pier sections, and the connection mode is that reliable bonding is formed among the sleeve, the reinforcing steel bars and the grouting material to work after the grouting material is condensed and hardened. The bridge pier is one of the categories of prefabricated assembled connecting structures which are most widely applied at present, and the performance of the bridge pier under the earthquake directly influences the earthquake-resistant performance of the whole bridge pier. The existing research shows that under the action of earthquake, the bearing capacity of the prefabricated pier is similar to that of a cast-in-place pier, when the sleeve is arranged at the bottom of the pier, deformation is mainly concentrated at the position of the splicing seam, the displacement ductility of the sleeve is usually relatively low, and the application of the prefabricated spliced pier connected by the grouting sleeve in high earthquake risk areas is influenced.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a partially unbonded grouting sleeve prefabricated splicing connection structure and a construction method; the novel splicing connection mode can meet the connection requirement of the normal use performance of the prefabricated spliced pier, and can improve the energy dissipation capacity and certain self-resetting capacity of the pier under an earthquake by utilizing the friction between the outwards extending reinforcing steel bars of the bearing platform and the grouting material in the grouting sleeve and matching the unbonded prestressed reinforcing steel bars.
The invention relates to a partially unbonded grouting sleeve prefabricated splicing connection structure, which coats a layer of anticorrosive lubricating grease on a bearing platform overhanging steel bar with a certain length in a grouting sleeve, coats a sleeve with a corresponding length externally, and uses flexible sealing glue to carry out water sealing treatment on the upper end and the lower end of the sleeve so as to enable the bearing platform overhanging steel bar in the grouting sleeve to form a steel bar unbonded section with a certain length. The invention not only ensures the connection stress of the pier and the bearing platform under normal use, but also can improve the energy consumption capability of the pier through the sliding friction of the outward extending reinforcing steel bars of the bearing platform in the grouting sleeve under the action of an earthquake. Meanwhile, the partial unbonded grouting sleeve prefabricated assembling connection structure has the advantages of simple structure, convenience in construction, high economical efficiency and the like, and is convenient to popularize and apply.
The purpose of the invention can be realized by the following technical scheme:
the invention provides a partially unbonded grouting sleeve prefabricated assembly connecting structure which is fixed in a pier and a bearing platform from top to bottom and comprises main pier reinforcements, outward extending reinforcing steel bars of the bearing platform, a sleeve, a grouting sleeve and unbonded prestressed reinforcing steel bars,
the grouting sleeve is arranged at the bottom of the pier; the upper part of the grouting sleeve is a main reinforcing steel bar section of a pier of the grouting sleeve, and the lower part of the grouting sleeve is an outward extending reinforcing steel bar section of a bearing platform of the grouting sleeve; the main bridge pier ribs are inserted into the main bridge pier rib sections of the grouting sleeves; grouting material is introduced into the grouting sleeve;
the upper part of the outwards extending reinforcing steel bar of the bearing platform is a reinforcing steel bar non-bonding section, and the lower part of the outwards extending reinforcing steel bar of the bearing platform is a reinforcing steel bar bonding section; the reinforcing steel bar non-bonding section and a section of reinforcing steel bar bonding section of the cushion cap overhanging reinforcing steel bar are inserted into the grouting sleeve cushion cap overhanging reinforcing steel bar section, and the other end of the cushion cap overhanging reinforcing steel bar is pre-embedded in the cushion cap;
the outside of the non-adhesive section of the reinforcing steel bar is sleeved with a sleeve to form the non-adhesive section in the grouting sleeve;
the unbonded prestressed tendon is positioned in the center of the bridge pier and penetrates through the bridge pier;
under the action of seismic load of the pier, the unbonded section in the grouting sleeve allows the overhanging steel bars of the bearing platform to slide in the grouting sleeve, the overall rigidity is reduced by the sliding generated between the overhanging steel bars of the bearing platform and the grouting material to realize vibration isolation, and the shock absorption is realized by the friction energy dissipation effect between the overhanging steel bars of the bearing platform and the grouting material; the unbonded prestressed ribs and the unbonded sections in the grouting sleeve are arranged to provide restoring force for piers, so that residual deformation is reduced, and the condition that the outward extending reinforcing steel bars of the bearing platform in the grouting sleeve only slide and cannot be pulled out under the action of an earthquake is ensured.
In one embodiment of the invention, the main pier reinforcement and the outer extension reinforcement have the same diameter.
In one embodiment of the present invention, a pad layer is provided on the bottom of the pier and the top of the cap.
In one embodiment of the invention, the unbonded prestressed tendon penetrates through the center positions of the pier, the cushion layer and the bearing platform from top to bottom; the unbonded prestressed tendon is provided with a non-stretching anchoring end in the bearing platform, and the middle part is not grouted.
In one embodiment of the present invention, the grouting sleeve is provided in plurality along an outer edge of the pier.
In one embodiment of the invention, a grout outlet is arranged on the side surface of the upper end of a main reinforcement section of a grouting sleeve pier of the grouting sleeve, and a grout pressing outlet is arranged on the side surface of the lower end of an overhanging reinforcement section of a grouting sleeve bearing platform of the grouting sleeve.
In one embodiment of the invention, the grout sleeve comprises a full grout sleeve or a half grout sleeve.
In one embodiment of the invention, the grout sleeve is selected from the group consisting of a ductile iron sleeve, a premium carbon steel sleeve, a low alloy high strength structural steel sleeve, an alloy structural steel sleeve, or a machined sleeve.
In one embodiment of the invention, the minimum inner diameter of the grouting sleeve is preferably 40mm larger than the diameter of the outside steel bar of the bearing platform.
In one embodiment of the invention, the length of the steel bar bonding section of the pile cap overhanging steel bar inserted into the grouting sleeve is more than or equal to 4 times the diameter of the pile cap overhanging steel bar;
preferably, the length of the bonding section of the pile cap overhanging steel bar inserted into the grouting sleeve is 6 times of the diameter of the pile cap overhanging steel bar.
In one embodiment of the invention, the length of the abutment overhanging steel bar inserted into the grouting sleeve is 10 times the diameter of the abutment overhanging steel bar.
In one embodiment of the invention, the main pier rib and the grouting sleeve are connected through grouting material anchoring.
In one embodiment of the invention, a layer of anti-corrosion grease is coated outside the non-bonded section of the reinforcing steel bar, a sleeve is sleeved on the non-bonded section of the reinforcing steel bar, and the upper end and the lower end of the sleeve are subjected to water sealing treatment by using flexible sealant.
In one embodiment of the invention, the flexible sealant comprises a paste sealant or a hot melt sealant.
The second purpose of the invention is to provide a construction method of the prefabricated assembled connecting structure of the partial unbonded grouting sleeve, which comprises the following steps:
(S1) binding a pier reinforcement cage, connecting a pier main reinforcement with a grouting sleeve, pouring pier body concrete by a formwork, reserving an unbonded prestressed reinforcement hole channel, and maintaining for 28 days;
(S2) constructing a bearing platform, wherein corrosion-resistant lubricating grease is coated at the non-bonded sections of reinforcing steel bars of the outwards extending reinforcing steel bars of the bearing platform, which are connected with grouting sleeves in piers, sleeves with corresponding lengths are sleeved outside the non-bonded sections, flexible sealing glue is used for performing water sealing treatment on the upper end and the lower end of each sleeve, the sleeves are fixed by spring clamps, and simultaneously non-bonded prestressed ribs and non-tensioned anchoring ends are pre-embedded in the bearing platform;
(S3) removing the spring clamp, hoisting the pier to the position above the bearing platform, inserting the outward extending reinforcing steel bars of the bearing platform into the grouting sleeve, enabling the unbonded prestressed reinforcing steel bars to penetrate through the reserved hole of the pier body, sequentially injecting grouting materials into the grouting sleeve after the pier is installed by a mortar setting method, completing connection after the unbonded prestressed reinforcing steel bars are hardened, and finally tensioning and anchoring the unbonded prestressed reinforcing steel bars at the top of the pier.
In one embodiment of the present invention, the sleeve is fixed by a spring clip before bridge abutment erection.
In one embodiment of the invention, the spring clip is formed by wrapping a rubber layer with a non-slip function around the spring wire.
Under the normal use condition, the reinforcing bar bonding section that the overhanging reinforcing bar of cushion cap inserts more than or equal to 4 times overhanging reinforcing bar diameter of cushion cap in the grout sleeve can provide sufficient bonding anchor effect for the normal atress of pier is assembled in the prefabrication. Under the action of an earthquake, the traditional grouting sleeve is connected with the pier bottom of the pier to form a plastic hinge, the joint of the pier bottom and the bearing platform is gradually opened, and finally, the damage form of the steel bar breaking is mainly used. After the unbonded section is arranged in the grouting sleeve, the phenomenon of slippage of the outwards extending reinforcing steel bars of the bearing platform provided with the unbonded section during earthquake is allowed due to the reduction of the anchoring length of the reinforcing steel bars. Therefore, the overall rigidity is reduced by debonding the overhanging steel bars of the bearing platform and the grouting material under the action of earthquake, the dynamic characteristic of the structure is changed, and the purpose of shock insulation is realized; the sliding friction between the outward extending steel bars of the bearing platform and the grouting material provides friction-type energy consumption for the bridge pier, and shock absorption is realized; the arrangement of the unbonded prestressed tendons provides effective restoring force for pier bodies of piers, reduces residual deformation, and ensures that the bearing platform overhanging steel bars in the grouting sleeve only slide and cannot be pulled out under the action of an earthquake; and the combination of the unbonded prestressed tendons and the outward extending reinforcing steel bars of the bearing platform ensures that the strength of the grouting sleeve connected with the outward extending reinforcing steel bars of the bearing platform is reduced and is not too large after the outward extending reinforcing steel bars of the bearing platform are debonded, thereby ensuring the ductility of the structure. The overall design concept of the scheme is not the equivalent cast-in-place design of the traditional grouting sleeve connected pier, but is close to the design concept of a self-resetting system.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the partially unbonded grouting sleeve prefabricated assembly connecting structure, the reinforcing steel bar bonding section with the diameter which is larger than or equal to 4 times of the diameter of the overhanging reinforcing steel bar of the bearing platform is inserted into the grouting sleeve, so that a sufficient bonding anchoring effect can be provided for the normal stress of the prefabricated assembly pier;
(2) according to the partially unbonded grouting sleeve prefabricated splicing connection structure, after the unbonded section is arranged in the grouting sleeve, the phenomenon that the outwards extending reinforcing steel bars of the bearing platform in the grouting sleeve slide relative to the grouting material in the grouting sleeve during an earthquake is allowed due to the reduction of the anchoring length of the reinforcing steel bars.
(3) According to the partially unbonded grouting sleeve prefabricated assembly connecting structure, the relative sliding between the extending reinforcing steel bars of the bearing platform and the grouting material under the action of an earthquake reduces the overall rigidity, the dynamic characteristic of the structure is changed, and the purpose of shock insulation is achieved; the sliding friction between the outward extending steel bars of the bearing platform and the grouting material provides friction-type energy consumption for the bridge pier, and shock absorption is realized;
(4) according to the partially unbonded grouting sleeve prefabricated assembly connecting structure, the unbonded prestressed ribs and the unbonded sections in the grouting sleeve are arranged to provide effective restoring force for piers, so that residual deformation is reduced, the residual deformation of the prefabricated assembly piers is smaller than that of common reinforced concrete piers provided with the unbonded prestressed ribs, and the extending reinforcing steel bars of the bearing platform in the grouting sleeve only slide and cannot be pulled out under the earthquake action; and the combination of the unbonded prestressed tendons and the main pier tendons ensures that the strength of the grouting sleeve connected with the main pier tendons is not reduced to be too large after the main pier tendons are debonded, and the ductility of the structure is ensured.
(5) The partially unbonded grouting sleeve prefabricated splicing connection structure has the advantages of simple structure, convenience in construction, high economy and the like, and is convenient to popularize and apply.
Drawings
FIG. 1 is a schematic view of the overall structure of a partially unbonded grouting sleeve prefabricated assembly connection structure of the invention;
FIG. 2 is a cross-sectional view of a pier in the overall structural schematic diagram of the partially unbonded grouting sleeve prefabricated assembly connecting structure of the invention, taken along the line I-I;
FIG. 3 is a schematic view of a grouting sleeve structure in a partially unbonded grouting sleeve prefabricated assembly connection structure according to the invention;
FIG. 4 is a schematic view of an overhanging steel bar of a bearing platform in a partially unbonded grouting sleeve prefabricated assembly connection structure of the invention;
reference numbers in the figures: 1 is a main bridge pier rib; 2, outwards extending reinforcing steel bars of the bearing platform; 3 is a sleeve; 4, a grouting sleeve; 5 is a cushion layer; 6 is a pier; 7 is a bearing platform; 8 is a spring clip; 9 is a reinforcing steel bar bonding section; 10 is a reinforcing steel bar non-adhesive section; 11 is an unbonded prestressed tendon; 12 are non-tensioned anchor ends.
Detailed Description
The invention provides a partially unbonded grouting sleeve prefabricated assembly connecting structure which is fixed in a pier and a bearing platform from top to bottom and comprises main pier reinforcements, outwards extending reinforcing steel bars of the bearing platform, a sleeve, a grouting sleeve and unbonded prestressed reinforcements,
the grouting sleeve is arranged at the bottom of the pier; the upper part of the grouting sleeve is a main reinforcing steel bar section of a pier of the grouting sleeve, and the lower part of the grouting sleeve is an outward extending reinforcing steel bar section of a bearing platform of the grouting sleeve; the main bridge pier ribs are inserted into the main bridge pier rib sections of the grouting sleeves; grouting material is introduced into the grouting sleeve;
the upper part of the outwards extending reinforcing steel bar of the bearing platform is a reinforcing steel bar non-bonding section, and the lower part of the outwards extending reinforcing steel bar of the bearing platform is a reinforcing steel bar bonding section; the reinforcing steel bar non-bonding section and a section of reinforcing steel bar bonding section of the cushion cap overhanging reinforcing steel bar are inserted into the grouting sleeve cushion cap overhanging reinforcing steel bar section, and the other end of the cushion cap overhanging reinforcing steel bar is pre-embedded in the cushion cap;
the outside of the non-adhesive section of the reinforcing steel bar is sleeved with a sleeve to form the non-adhesive section in the grouting sleeve;
the unbonded prestressed tendon is positioned in the center of the bridge pier and penetrates through the bridge pier;
under the action of seismic load of the pier, the unbonded section in the grouting sleeve allows the overhanging steel bars of the bearing platform to slide in the grouting sleeve, the overall rigidity is reduced by the sliding generated between the overhanging steel bars of the bearing platform and the grouting material to realize vibration isolation, and the shock absorption is realized by the friction energy dissipation effect between the overhanging steel bars of the bearing platform and the grouting material; the unbonded prestressed ribs and the unbonded sections in the grouting sleeve are arranged to provide restoring force for piers, so that residual deformation is reduced, and the condition that the outward extending reinforcing steel bars of the bearing platform in the grouting sleeve only slide and cannot be pulled out under the action of an earthquake is ensured.
In one embodiment of the invention, the main pier reinforcement and the outer extension reinforcement have the same diameter.
In one embodiment of the present invention, a pad layer is provided on the bottom of the pier and the top of the cap.
In one embodiment of the invention, the unbonded prestressed tendon penetrates through the center positions of the pier, the cushion layer and the bearing platform from top to bottom; the unbonded prestressed tendon is provided with a non-stretching anchoring end in the bearing platform, and the middle part is not grouted.
In one embodiment of the present invention, the grouting sleeve is provided in plurality along an outer edge of the pier.
In one embodiment of the invention, a grout outlet is arranged on the side surface of the upper end of a main reinforcement section of a grouting sleeve pier of the grouting sleeve, and a grout pressing outlet is arranged on the side surface of the lower end of an overhanging reinforcement section of a grouting sleeve bearing platform of the grouting sleeve.
In one embodiment of the invention, the grout sleeve comprises a full grout sleeve or a half grout sleeve.
In one embodiment of the invention, the grout sleeve is selected from the group consisting of a ductile iron sleeve, a premium carbon steel sleeve, a low alloy high strength structural steel sleeve, an alloy structural steel sleeve, or a machined sleeve.
In one embodiment of the invention, the minimum inner diameter of the grouting sleeve is preferably 40mm larger than the diameter of the outside steel bar of the bearing platform.
In one embodiment of the invention, the length of the steel bar bonding section of the pile cap overhanging steel bar inserted into the grouting sleeve is more than or equal to 4 times the diameter of the pile cap overhanging steel bar;
preferably, the length of the bonding section of the pile cap overhanging steel bar inserted into the grouting sleeve is 6 times of the diameter of the pile cap overhanging steel bar.
In one embodiment of the invention, the length of the abutment overhanging steel bar inserted into the grouting sleeve is 10 times the diameter of the abutment overhanging steel bar.
In one embodiment of the invention, the main pier rib and the grouting sleeve are connected through grouting material anchoring.
In one embodiment of the invention, a layer of anti-corrosion grease is coated outside the non-bonded section of the reinforcing steel bar, a sleeve is sleeved on the non-bonded section of the reinforcing steel bar, and the upper end and the lower end of the sleeve are subjected to water sealing treatment by using flexible sealant.
In one embodiment of the invention, the flexible sealant comprises a paste sealant or a hot melt sealant.
The second purpose of the invention is to provide a construction method of the prefabricated assembled connecting structure of the partial unbonded grouting sleeve, which comprises the following steps:
(S1) binding a pier reinforcement cage, connecting a pier main reinforcement with a grouting sleeve, pouring pier body concrete by a formwork, reserving an unbonded prestressed reinforcement hole channel, and maintaining for 28 days;
(S2) constructing a bearing platform, wherein corrosion-resistant lubricating grease is coated at the non-bonded sections of reinforcing steel bars of the outwards extending reinforcing steel bars of the bearing platform, which are connected with grouting sleeves in piers, sleeves with corresponding lengths are sleeved outside the non-bonded sections, flexible sealing glue is used for performing water sealing treatment on the upper end and the lower end of each sleeve, the sleeves are fixed by spring clamps, and simultaneously non-bonded prestressed ribs and non-tensioned anchoring ends are pre-embedded in the bearing platform;
(S3) removing the spring clamp, hoisting the pier to the position above the bearing platform, inserting the outward extending reinforcing steel bars of the bearing platform into the grouting sleeve, enabling the unbonded prestressed reinforcing steel bars to penetrate through the reserved hole of the pier body, sequentially injecting grouting materials into the grouting sleeve after the pier is installed by a mortar setting method, completing connection after the unbonded prestressed reinforcing steel bars are hardened, and finally tensioning and anchoring the unbonded prestressed reinforcing steel bars at the top of the pier.
In one embodiment of the present invention, the sleeve is fixed by a spring clip before bridge abutment erection.
In one embodiment of the invention, the spring clip is formed by wrapping a rubber layer with a non-slip function around the spring wire.
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
The embodiment provides a partially unbonded grouting sleeve prefabricated splicing connection structure.
As shown in fig. 1-4, a partially unbonded grouting sleeve prefabricated assembly connecting structure comprises a main pier reinforcement 1 and a cushion cap overhanging reinforcement 2 which need to be anchored and connected, a sleeve 3 for performing unbonded treatment on the cushion cap overhanging reinforcement 2, and a grouting sleeve 4 pre-buried at the bottom of a pier 6.
The bottom of the pier 6 and the top of the bearing platform 7 are provided with cushion layers 5, and the pier 6, the cushion layers 5 and the bearing platform 7 are sequentially arranged from top to bottom;
the prefabricated assembly connecting structure of the partial unbonded grouting sleeve is fixed on the pier 6, the cushion layer 5 and the bearing platform 7;
the upper part of the grouting sleeve 4 is a main reinforcing steel bar section of a grouting sleeve pier, and the lower part of the grouting sleeve 4 is an outward extending reinforcing steel bar section of a grouting sleeve bearing platform; the pier main rib 1 is inserted into the pier main rib section of the grouting sleeve; grouting material is filled into the grouting sleeve 4;
the upper part of the outwards extending reinforcing steel bar 2 of the bearing platform is provided with a reinforcing steel bar non-bonding section 10, and the lower part is provided with a reinforcing steel bar bonding section 9; the reinforcing steel bar non-bonding section 10 and a section of reinforcing steel bar bonding section 9 of the cushion cap overhanging reinforcing steel bar 2 are inserted into the grouting sleeve cushion cap overhanging reinforcing steel bar section; the other end of the out-extending steel bar 2 of the bearing platform is embedded in the bearing platform 7; the sleeve 3 is sleeved outside the reinforcement unbonded section 10 to form an unbonded section in the grouting sleeve 4; the unbonded prestressed tendon 11 is positioned at the center of the pier 6 and penetrates through the center of the pier 6, the cushion layer 5 and the bearing platform 7 from top to bottom; the unbonded prestressed tendon 11 is provided with a non-stretching anchoring end 12 in the bearing platform 7, and no grouting is performed in the middle.
A plurality of grouting sleeves 4 are arranged along the outer edge of the pier 6; a grout outlet is formed in the side face of the upper end of a main reinforcing steel bar section of a grouting sleeve pier of the grouting sleeve 4, and a grout pressing port is formed in the side face of the lower end of an overhanging reinforcing steel bar section of a grouting sleeve bearing platform of the grouting sleeve 4; the length of the reinforcing steel bar bonding section 9 of the extending reinforcing steel bar of the bearing platform inserted into the grouting sleeve 4 is more than or equal to 4 times of the diameter of the extending reinforcing steel bar of the bearing platform. The grouting sleeve 4 comprises a full grouting sleeve or a half grouting sleeve; the grouting sleeve 4 is selected from a nodular cast iron sleeve, a high-quality carbon steel sleeve, a low-alloy high-strength structural steel sleeve, an alloy structural steel sleeve or a machining sleeve; after the main bridge pier ribs 1 are inserted into the grouting sleeves, grouting material is poured from the grouting opening at the lower part until the grouting material overflows from the grouting opening at the upper part, and connection and anchoring are completed;
coating a layer of anticorrosive lubricating grease on the reinforcement unbonded section 10 of the cushion cap overhanging reinforcement 2, sleeving a sleeve 3 with a corresponding length outside, performing water seal treatment on the upper end and the lower end of the sleeve 3 by using flexible sealing glue, and fixing by using a spring clamp 8 before assembling the pier 6 so as to enable the cushion cap overhanging reinforcement 2 in the grouting sleeve 4 to form the reinforcement unbonded section 10 with a certain length; the flexible sealant comprises a paste sealant or a hot-melt sealant; the length of the outward extending steel bar 2 of the bearing platform inserted into the grouting sleeve 4 is 10 times of the diameter of the outward extending steel bar 2 of the bearing platform; the minimum inner diameter of the grouting sleeve 4 is preferably 40mm larger than the diameter of the support platform overhanging steel bar 2.
Under the action of earthquake load, the unbonded section in the grouting sleeve 4 of the pier 6 allows the outward extending steel bar 2 of the bearing platform to slide in the grouting sleeve 4, the overall rigidity is reduced by the sliding generated between the outward extending steel bar 2 of the bearing platform and the grouting material to realize vibration isolation, and the friction energy dissipation effect between the outward extending steel bar 2 of the bearing platform and the grouting material realizes shock absorption; the unbonded prestressed ribs 11 and the unbonded sections in the grouting sleeve 4 are arranged to provide restoring force for the piers 6, so that residual deformation is reduced, and the condition that the cushion cap overhanging steel bars 2 in the grouting sleeve 4 only slide and cannot be pulled out under the action of an earthquake is ensured.
Example 2
The embodiment provides a construction method for a partially unbonded grouting sleeve prefabricated splicing connection structure.
A construction method for a partially unbonded grouting sleeve prefabricated splicing connection structure comprises the following steps:
(S1) binding a pier reinforcement cage, connecting the pier main reinforcement 1 with the grouting sleeve 4, pouring pier body concrete of a pier 6 by using a formwork, reserving a hole channel of the unbonded prestressed reinforcement 11, and maintaining for 28 days;
(S2) constructing a bearing platform 7, wherein anticorrosion lubricating grease is coated on the non-bonded section 10 of the reinforcing steel bar of the bearing platform overhanging reinforcing steel bar 2 connected with the grouting sleeve 4 in the pier 6, the sleeve 3 with the corresponding length is sleeved outside, the upper end and the lower end of the sleeve 3 are subjected to water sealing treatment by flexible sealing glue, the sleeve 3 is fixed by a spring clamp 8, and the non-bonded prestressed bar 11 and the non-tensioned anchoring end 12 are pre-embedded in the bearing platform 7;
(S3) removing the spring clamp 8, hoisting the pier 6 to the position above the bearing platform, inserting the outward extending reinforcing steel bar 2 of the bearing platform into the grouting sleeve 4, enabling the unbonded prestressed tendon 11 to penetrate through the reserved hole of the pier body, sequentially injecting grouting material into the grouting sleeve 4 after the pier 6 is installed by a setting grouting method, completing connection after the unbonded prestressed tendon is hardened, and finally tensioning and anchoring the unbonded prestressed tendon 11 at the top of the pier 6.
In this embodiment, preparation before construction: and cleaning the construction site according to a design drawing, and organizing construction materials, machinery and personnel in place.
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. A partially unbonded grouting sleeve prefabricated assembly connecting structure is fixed in a pier (6) and a bearing platform (7) from top to bottom and is characterized by comprising main pier reinforcements (1), outward extending reinforcing steel bars (2) of the bearing platform, a sleeve (3), a grouting sleeve (4) and unbonded prestressed reinforcements (11),
the grouting sleeve (4) is arranged at the bottom of the pier (6); the upper part of the grouting sleeve (4) is a main steel bar section of a grouting sleeve pier, and the lower part of the grouting sleeve is an outward extending steel bar section of a grouting sleeve bearing platform; the pier main rib (1) is inserted into the pier main rib section of the grouting sleeve; grouting material is introduced into the grouting sleeve (4);
the upper part of the outwards extending reinforcing steel bar (2) of the bearing platform is provided with a reinforcing steel bar non-bonding section (10), and the lower part of the outwards extending reinforcing steel bar is provided with a reinforcing steel bar bonding section (9); a reinforcing steel bar non-bonding section (10) and a reinforcing steel bar bonding section (9) of the cushion cap overhanging reinforcing steel bar (2) are inserted into the grouting sleeve cushion cap overhanging reinforcing steel bar section, and the other end of the cushion cap overhanging reinforcing steel bar (2) is pre-embedded in the cushion cap (7);
the sleeve (3) is sleeved outside the non-adhesive section (10) of the reinforcing steel bar to form the non-adhesive section in the grouting sleeve (4);
the unbonded prestressed tendon (11) is positioned at the center of the pier (6) and penetrates through the pier (6);
under the action of earthquake load, the unbonded section in the grouting sleeve (4) of the pier (6) allows the bearing platform overhanging steel bar (2) to slide in the grouting sleeve (4), the overall rigidity is reduced by the sliding generated between the bearing platform overhanging steel bar (2) and the grouting material to realize vibration isolation, and the friction energy dissipation effect between the bearing platform overhanging steel bar (2) and the grouting material realizes shock absorption; the unbonded prestressed ribs (11) and the unbonded sections in the grouting sleeve (4) are arranged to provide restoring force for the piers (6), so that residual deformation is reduced, and the condition that the cushion cap overhanging steel bars (2) in the grouting sleeve (4) only slide and cannot be pulled out under the action of an earthquake is ensured.
2. The partially unbonded grouting sleeve prefabricated assembly connecting structure as claimed in claim 1, wherein the bottom of the pier (6) and the top of the bearing platform (7) are provided with cushion layers (5).
3. The partially unbonded grouting sleeve prefabricated assembly connecting structure as claimed in claim 1, wherein the unbonded prestressed tendons (11) penetrate through the center positions of the pier (6), the cushion layer (5) and the bearing platform (7) from top to bottom; the unbonded prestressed tendons (11) are provided with non-tensioning anchoring ends (12) in the bearing platform (7), and the middle part is not grouted.
4. The partially unbonded grouting sleeve prefabricated assembly connecting structure as claimed in claim 1, wherein a grout outlet is formed in the side surface of the upper end of a main reinforcing steel bar section of a grouting sleeve pier of the grouting sleeve (4), and a grout pressing port is formed in the side surface of the lower end of an overhanging reinforcing steel bar section of a grouting sleeve bearing platform of the grouting sleeve (4).
5. The partially unbonded grouting sleeve prefabricated assembly connecting structure as claimed in claim 1, wherein the length of the reinforcing steel bar bonding section (9) of the pile cap overhanging reinforcement (2) inserted into the grouting sleeve (4) is greater than or equal to 4 times the diameter of the pile cap overhanging reinforcement (2).
6. The partially unbonded grouting sleeve prefabricated assembly connecting structure as claimed in claim 1, wherein the length of the protruding reinforcing steel bars (2) inserted into the grouting sleeve (4) is 10 times the diameter of the protruding reinforcing steel bars (2).
7. The partially unbonded grouting sleeve prefabricated assembly connecting structure as claimed in claim 1, wherein the main pier ribs (1) are connected with the grouting sleeves (4) through grouting material anchoring.
8. The partially unbonded grouting sleeve prefabricated assembly connecting structure as claimed in claim 1, wherein a layer of anti-corrosive grease is applied to the exterior of the unbonded reinforcing steel bar section (10), the sleeve (3) is sleeved on the partially unbonded grouting sleeve, and the upper end and the lower end of the sleeve (3) are subjected to water sealing treatment by using flexible sealants.
9. A construction method of the partially unbonded grouted sleeve prefabricated joined structure according to claim 1, comprising the steps of:
(S1) binding a steel reinforcement cage of the pier (6), connecting the main pier reinforcement (1) with the grouting sleeve (4), pouring concrete of the pier body of the pier (6) through a formwork, reserving a hole channel of the unbonded prestressed reinforcement (11), and maintaining for 28 days;
(S2) constructing a bearing platform (7), wherein anticorrosion lubricating grease is coated at a reinforcing steel bar unbonded section (10) of a bearing platform overhanging reinforcing steel bar (2) connected with a grouting sleeve (4) in a pier (6), a sleeve (3) with a corresponding length is sleeved outside the reinforcing steel bar unbonded section, flexible sealing glue is used for performing water sealing treatment on the upper end and the lower end of the sleeve (3), a spring clamp (8) is adopted to fix the sleeve (3), and an unbonded prestressed rib (11) and a non-tensioning anchoring end (12) are pre-embedded in the bearing platform (7) at the same time;
(S3) removing the spring clamp (8), hoisting the pier (6) to the upper side of the bearing platform (7), inserting the outward extending reinforcing steel bar (2) of the bearing platform into the grouting sleeve (4), penetrating the unbonded prestressed reinforcement (11) through the reserved hole of the pier body, installing the pier (6) through a seat grouting method, sequentially injecting grouting material into the grouting sleeve (4), completing connection after hardening of the grouting material, and finally tensioning and anchoring the unbonded prestressed reinforcement (11) at the top of the pier (6).
10. The construction method of the partially unbonded grouted sleeve prefabricated joined structure according to claim 9, wherein the sleeve (3) is fixed by the spring clip (8) before the bridge pier (6) is assembled.
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