CN113123221A - Prefabricated assembled hollow pier based on UHPC joint and construction method - Google Patents
Prefabricated assembled hollow pier based on UHPC joint and construction method Download PDFInfo
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- CN113123221A CN113123221A CN202010030426.7A CN202010030426A CN113123221A CN 113123221 A CN113123221 A CN 113123221A CN 202010030426 A CN202010030426 A CN 202010030426A CN 113123221 A CN113123221 A CN 113123221A
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 68
- 238000010276 construction Methods 0.000 title claims abstract description 39
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 229
- 239000010959 steel Substances 0.000 claims abstract description 229
- 230000002787 reinforcement Effects 0.000 claims abstract description 38
- 239000004567 concrete Substances 0.000 claims abstract description 29
- 239000007787 solid Substances 0.000 claims description 36
- 230000003014 reinforcing effect Effects 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000007788 roughening Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000009417 prefabrication Methods 0.000 claims description 2
- 238000005056 compaction Methods 0.000 abstract description 4
- 210000001503 joint Anatomy 0.000 description 38
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000011178 precast concrete Substances 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229920006335 epoxy glue Polymers 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- -1 prestressed tendons Substances 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000004826 seaming Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 210000002435 tendon Anatomy 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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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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Abstract
A prefabricated hollow pier assembled based on UHPC seam and construction method thereof, having pier stud and base, the said pier stud is the hollow pier stud, the said pier stud is from the bottom to the top to make up of pier bottom segment, intermediate segment, top cap segment sequentially, the pier bottom segment locates at the top of base, pre-buried steel bar joint between pier bottom segment and base, between pier bottom segment and intermediate segment, intermediate segment and top cap segment, the steel bar joint is equipped with the reinforcement stirrup outside, post-cast UHPC seam realizes the connection, the invention makes the steel bar joint between the segments position, connect simply, the seam height is reduced apparently, the seam concrete consumption is small; the segment construction tolerance is large, and the precision requirement is low; the joints are free from vibration, self-compaction is convenient for pouring, and the construction is simple; the assembled pier has excellent overall performance, strong seam durability, quick assembly, short field operation time and high efficiency.
Description
Technical Field
The invention relates to the field of bridge construction, in particular to a prefabricated assembled hollow pier based on UHPC joints and a construction method.
Background
The construction of the segmental prefabricated assembled pier is one of the bridge rapid construction technologies, is applied to the municipal engineering of roads and the sea-crossing long bridge engineering at home and abroad, particularly the sea-crossing engineering, has poor construction conditions and is difficult in reinforcement binding, concrete pouring and maintenance, and has great advantages by adopting the prefabricated assembled construction. The hollow pier is one of the most basic pier types in the pier structure, has the advantages of high rigidity, light segment weight and the like, and is applied to prefabricated assembled piers.
At present, the segment prefabricated assembly type hollow pier is assembled by adopting two methods of post-cast concrete joint or prestress connection, wherein the post-cast concrete joint means that segments are prefabricated in a factory, a straight-line or U-shaped steel bar joint is reserved on a connecting surface of the segments, a section of post-cast concrete joint is arranged between the segments, the steel bar joint is reserved by field butt welding or binding, and then concrete is post-cast to realize the connection between the prefabricated segments. The main disadvantages of this solution are as follows:
1. the steel bar joints are difficult to align and connect, the steel bars need to be welded in a butt joint mode one by adopting the welding of the straight-line-shaped steel bars, the steel bars are difficult to align accurately, and the welding process is complex; the U-shaped steel bar binding joint needs to be provided with stronger reinforcing steel bars. Meanwhile, the segment inner joint steel bars need to be reserved with longer length, and are inconvenient to manufacture.
2. The post-cast concrete seam needs highly high, for realizing that post-cast concrete wraps up in and passes power to the bond of reinforcing bar, and need stagger between the reinforcing bar joint, the seam height generally need be by more than 35 times of connecting reinforcement diameter, greatly increased the height of seam, cause post-cast concrete large in quantity.
3. The post-cast concrete joint needs vibration and maintenance, the concrete construction process is complex, the strength of the joint surface between the post-cast concrete joint and the precast concrete is low, shrinkage cracks are easy to cause, the cracks can become corrosion channels, and the structural durability is influenced.
4. The post-cast concrete joint has the working procedures of steel bar alignment connection and the like, so that the concrete pouring amount is large, the joint operation time is slightly long, and the efficiency is slightly low.
The segment prefabricated assembled hollow pier prestress connection means that segments are prefabricated in a factory, a thick steel bar or a high-strength steel bar and the like are adopted for on-site splicing, after the segments are assembled, the thick steel bar or the high-strength steel bar is tensioned on the segments, and connection and force transmission between the segments are realized through prestress, wherein the scheme has the following main defects:
1. the segment manufacturing accuracy requirement is high, must match completely between each segment, and the construction tolerance is little, generally sets up 2 ~ 3 mm's epoxy glue between the segment, and thickness is less, is unfavorable for the adjustment of segment joint face error, has increased the construction degree of difficulty to the great cross-section of size.
2. The prestress adopts a coarse steel bar or a high-strength steel bar, the prestress needs to be tensioned, the requirements of prestress tensioning and grouting processes are high, the risk of loss and even failure exists in the later stage of the prestress, and the connection form has poor ductility and insufficient energy consumption and is not suitable for high-earthquake areas.
3. The overall quality control difficulty of the prestressed connection is high, the requirements on durability of the used connecting materials such as prestressed tendons, epoxy resin glue and the like are high, and the requirements on protective measures are high when the prestressed connection is applied to severe corrosion environments such as cross-sea engineering and the like.
Disclosure of Invention
The invention provides a prefabricated assembled hollow pier based on UHPC seams and a construction method, aims to solve the problems in the prior art, and provides the prefabricated assembled hollow pier which is simple and rapid in construction, high in efficiency, good in anti-seismic performance and long in service life and the construction method.
The technical scheme adopted by the invention for solving the problems is as follows:
the utility model provides a hollow pier is assembled in prefabrication based on UHPC seam has pier stud and base, the pier stud is hollow pier stud, its characterized in that: the pier column sequentially comprises a pier bottom section, a middle section and a top cap section from bottom to top, the pier bottom section is positioned at the top of the base, steel bar joints are embedded between the pier bottom section and the base, between the pier bottom section and the middle section and between the middle section and the top cap section, reinforcing stirrups are arranged outside the steel bar joints, connecting steel bars are pre-embedded in the base, the pier bottom section, the middle section and the top cap section, the solid section is arranged at the bottom of the pier bottom section, the hollow section is arranged at the top of the pier bottom section, the solid section of the pier bottom section is connected with the base, the hollow section of the pier bottom section is connected with the middle section, the solid section steel bar of the pier bottom section is pre-embedded at the top of the base, and binding a steel reinforcement cage on the solid section steel bar of the embedded pier bottom section, wherein the solid section steel bar of the pier bottom section and the steel reinforcement cage are positioned in the solid section of the pier bottom section and are fixedly connected with the solid section of the pier bottom section through on-site concrete pouring.
The embedded connecting steel bar in base, pier bottom segment, middle segment, top cap segment partly is inboard connecting steel bar, and partly is outside connecting steel bar, the bottom of pier bottom segment, middle segment, top cap segment is equipped with support column and backplate, and the height that highly is greater than the embedded steel bar of support column connects, the backplate sets up at the mound wall outward flange, prefabricates jointly with the segment, the inboard of backplate is followed to pier bottom segment, middle segment, top cap segment inside wall extension to the edge of pier bottom segment, middle segment, top cap segment inside wall.
An upper embedded steel plate is embedded in the support column, a lower embedded steel plate is embedded in the lower section corresponding to the support column, and the connecting steel plate is welded to the upper embedded steel plate and the lower embedded steel plate through splicing seams.
And cushion pads are respectively arranged at the positions corresponding to the support columns at the tops of the base, the pier bottom sections and the middle sections.
Pre-buried inboard connecting reinforcement and outside connecting reinforcement, both length difference, inboard connecting reinforcement are located base, pier base segment section, middle section, top cap segment inboard, and outside connecting reinforcement is located base, pier base segment section, middle section, top cap segment's the outside, and pre-buried certain length in base, pier base segment section, middle section, top cap segment, inboard connecting reinforcement and outside connecting reinforcement plane position crisscross distribution each other, but the reinforcing bar joint length requirement overlap joint that inboard connecting reinforcement and outside connecting reinforcement reserved.
Furthermore, the embedded inner side connecting steel bars and the embedded outer side connecting steel bars can be connected together through the short steel bars to form U-shaped arrangement.
The middle sections are standard middle sections, the number of the middle sections is multiple, steel bar joints are embedded between the standard middle sections and the standard middle sections, reinforcing stirrups are bound outside the steel bar joints, and connection is achieved through post-pouring UHPC joints.
The top of base is equipped with the waterstop, the bottom of pier base festival section is equipped with support column and backplate, is equipped with the waterstop notch on the backplate, the waterstop notch cooperatees with the waterstop and uses, the size shape phase-match of waterstop notch and waterstop.
Furthermore, pier base section outwards local thickening plays crashproof protective structure's effect.
Furthermore, the connection between the base and the pier bottom segment, between the pier bottom segment and the middle segment, between the middle segments and between the middle segment and the top cap segment is realized by pouring UHPC joints, the upper parts of the UHPC joints are provided with slopes, and the UHPC joints are poured and discharged from the slopes, so that the pouring and compactness are facilitated.
A construction method of a prefabricated assembled hollow pier based on UHPC joints is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
the method comprises the following steps: constructing a base at a preset place, embedding connecting steel bars in the base, embedding solid section steel bars of a pier bottom section, binding a steel reinforcement cage on the embedded solid section steel bars of the pier bottom section, installing a water stop belt positioned at the top of the base, and chiseling a connecting region of the top of the base and the solid section of the pier bottom section;
step two: prefabricating a pier bottom section in a factory, chiseling a connecting area, arranging a cushion pad on the top of the base corresponding to the support column and the guard plate, and hoisting the pier bottom section to be spliced with the base and supporting the pier bottom section on the cushion pad; aligning the pier bottom section waterstop notch with a waterstop on the base, and tightly pressing the waterstop through gravity to finish the installation of a waterstop structure; aligning connecting steel bars pre-buried in a pier bottom section with connecting steel bars pre-buried in a base, arranging the connecting steel bars in a staggered manner, binding reinforcing stirrups outside the connecting steel bars in the horizontal direction, erecting inner side templates on the side walls of joints, fixing the side templates on the inner walls of the upper and lower sections, forming a post-pouring joint area together with guard plate structures on the upper and lower sections and the pier wall, pouring UHPC (ultra high performance concrete) and maintaining;
step three: pouring concrete of the solid section of the pier bottom, and maintaining;
step four: prefabricating a middle section in a factory, chiseling the area where the middle section is connected with the pier bottom section, arranging a cushion pad at the top of the pier bottom section corresponding to a support column and a guard plate of the middle section, hoisting the middle section, splicing with the pier bottom section and supporting on the cushion pad; welding the upper embedded steel plate and the lower embedded steel plate through a connecting steel plate; aligning the connecting steel bars pre-buried in the middle section with the connecting steel bars pre-buried in the pier bottom section, arranging the connecting steel bars in a staggered manner, binding reinforcing stirrups outside the connecting steel bars along the horizontal direction, erecting a joint template, pouring UHPC in the joints, and maintaining;
step five: prefabricating a top cap section in a factory, roughening the area where the top cap section is connected with the middle section, arranging a cushion pad at the top of the middle section corresponding to a support column and a protection plate of the top cap section, hoisting the top cap section, splicing with the middle section and supporting on the cushion pad; welding the upper embedded steel plate and the lower embedded steel plate through a connecting steel plate; aligning the connecting steel bars pre-buried in the top cap segment with the connecting steel bars pre-buried in the middle segment, arranging the connecting steel bars in a staggered manner, binding reinforcing stirrups outside the connecting steel bars along the horizontal direction, erecting a joint template, pouring UHPC in the joints, and maintaining;
step six: and after the UHPC is poured into all the joints and the maintenance is finished, removing the construction auxiliary measures, and finishing the construction of the prefabricated spliced hollow pier based on the UHPC joints.
A construction method of a prefabricated assembled hollow pier based on UHPC joints is characterized by comprising the following steps: when a plurality of middle sections need to be added, a step b is added between the fourth step and the fifth step, the middle sections are prefabricated in a factory, the connecting area between the middle sections is roughened, a cushion pad is arranged at the top of the middle section at the lower part and the corresponding part of the supporting column and the protecting plate of the middle section at the upper part, the middle section at the upper part is hoisted, and the middle section at the upper part is spliced with the middle section at the lower part and is supported on the cushion pad; and aligning the connecting steel bars pre-buried in the middle section of the lower part with the connecting steel bars pre-buried in the middle section of the upper part, arranging the connecting steel bars in a staggered manner, binding reinforcing stirrups outside the connecting steel bars along the horizontal direction, erecting a joint template, pouring UHPC in the joint, and maintaining.
The invention has the beneficial effects that:
1. connecting steel bar joints are embedded in the joints of the prefabricated sections, the steel bar joints are short in length and staggered on the plane, and the steel bars do not need to be aligned one by one during assembly, so that the positioning and embedding of the steel bars are facilitated; the steel bars are indirectly lapped through the UHPC, the steel bars do not need to be welded in a butt joint mode, the steel bars are simple and reliable in connection, and the construction difficulty is obviously reduced;
2. the post-cast UHPC concrete joint has small height, the requirement can be met generally by the lap length which is about 10 times of the diameter of the connected steel bar, and the concrete pouring square amount is small; the segment manufacturing precision requirement is low, the segments do not need to be manufactured in a matching mode, the segment short-line method is high in manufacturing speed, manufacturing deviation among the segments can be adjusted through post-cast joints, the segment short-line method is particularly suitable for avoiding construction error accumulation when the section is large in section, and the integral line shape and elevation of the spliced pier are easy to guarantee;
3. the post-cast UHPC concrete can realize vibration-free, self-leveling and self-compaction, and the joints provide templates by using the structure, so that the joint is not influenced by severe weather and is convenient to pour and maintain;
4, the UHPC has good volume stability, high tensile strength, small later drying shrinkage and high connection strength with a precast concrete interface, and can avoid shrinkage cracks; the UHPC has strong self-durability, compact internal structure and good durability of post-cast joints, and is particularly suitable for severe corrosive environments such as cross-sea engineering and the like;
the UHPC has high self-strength, and the reliable connection is formed between the reinforcing steel bars through stronger anchoring action, so that the effective force transmission of the reinforcing steel bars between the segments is realized, the integral performance of the assembled pier is excellent, the assembled pier can be applied to high-seismic areas, and the application range is wider;
6. the lower part of the section of the prefabricated section is provided with a support column, the height of the support column is greater than that of the embedded steel bar joint, and the section can be temporarily supported by the support column when stored in a factory without influencing the embedded steel bar joint; when the sections are spliced, the supporting column can be used as a temporary supporting structure of the upper section, a temporary jack or an external supporting structure is not needed, and construction is convenient; the support column can be used as a shear key tooth on the section, and the shearing resistance between the sections is enhanced.
7. An upper embedded steel plate is embedded in the support column, a lower embedded steel plate is embedded in the position, corresponding to the support column, of the lower section, a connecting steel plate is welded to the upper embedded steel plate and the lower embedded steel plate, and the connecting steel plate serves as an anti-overturning and stabilizing measure for the sections in the assembling construction process through splicing seams and strengthens the shearing resistance among the sections in the operation stage. 8. The guard plate structure is arranged around the segment, the guard plate structure and the lower segment can be used as a template of a post-cast joint after being assembled, and a template is not required to be additionally erected outside the pier stud when joint concrete is poured; the guard plate structure provides protection for the stressed steel bars, and the structural durability is enhanced; meanwhile, a certain construction protection effect is achieved, the influence of external severe weather is avoided, and a favorable operation environment is provided for the interior of the structure.
9. After the segments are in place, the joint construction only needs to carry out the processes of binding stirrups and pouring concrete, does not need to butt joint the reinforcements one by one, installing reinforcing reinforcements, pouring a large amount of common concrete and vibrating maintenance, and simultaneously does not need the processes of coating epoxy resin glue, installing and tensioning prestressed bundles, grouting pipelines and the like, and the joint site operation time is short and the efficiency is high.
Drawings
FIG. 1 is a schematic elevational view of the present invention;
FIG. 2 is a schematic view of the base structure of the present invention;
FIG. 3 is a schematic structural view of the cross-section of FIGS. 2IV-IV of the present invention;
fig. 4 is a schematic structural view of a pier base segment according to the present invention;
FIG. 5 is a schematic structural view of the cross-section of FIGS. 4III-III of the present invention;
FIG. 6 is a schematic view of the construction of an intermediate section according to the present invention;
FIG. 7 is a schematic structural view of the cross-section of FIGS. 6II-II of the present invention;
FIG. 8 is a schematic structural view of a top cap segment of the present invention;
FIG. 9 is a schematic structural view of the cross-section of FIGS. 8I-I of the present invention;
FIG. 10 is a schematic structural view of a spliced section (III-IV section joint) of a pier base section and a base according to the present invention;
FIG. 11 is a schematic structural view of a splicing section (I-II section seam) of the top cap section and the middle section of the present invention.
Fig. 12 is a schematic elevation structure of another embodiment of the present invention.
Wherein: 1. a base; 2. a pier bottom segment; 3. an intermediate section; 4. a top cap segment; 7. reinforcing the stirrup; UHPC seaming; 91. solid section steel bars of the pier bottom sections; 92. a reinforcement cage; 93. embedding steel bars in the pier bottom solid section segment; 10. a solid section; 11. a water stop; 12. a waterstop notch; 51. connecting reinforcing steel bars on the inner side; 52. connecting reinforcing steel bars on the inner side; 53. connecting reinforcing steel bars on the inner side; 54. connecting reinforcing steel bars on the inner side; 61. connecting the outside with a steel bar; 62. connecting the outside with a steel bar; 63. connecting the outside with a steel bar; 21. a support pillar; 31. a support pillar; 41 support columns; 22. a guard plate; 32. a guard plate; 42. a guard plate; 71. steel plates are pre-embedded; 72. lower pre-buried steel plates; 73. and connecting the steel plates.
Detailed Description
The invention is further described below with reference to the accompanying drawings and specific examples.
As shown in fig. 1-11, a prefabricated assembled hollow pier based on UHPC joint comprises a pier stud and a base 1, the pier stud is a hollow pier stud, the pier stud is sequentially composed of a pier bottom section 2, a middle section 3 and a top cap section 4 from bottom to top, the pier bottom section 2 is located at the top of the base 1, steel bar joints are embedded between the pier bottom section 2 and the base 1, between the pier bottom section 2 and the middle section 3, and between the middle section 3 and the top cap section 4, reinforcing stirrups 7 are arranged outside the steel bar joints, connecting steel bars are embedded in the base 1, the pier bottom section 2, the middle section 3 and the top cap section 4, the bottom of the pier is a solid section 10, the top is a hollow section, the solid section 10 of the pier bottom section is connected with the base 1, the hollow section of the pier bottom section is connected with the middle section 3, the solid section 91 of the pier bottom section is embedded at the top of the base 1, and binding a reinforcement cage 92 on the solid section steel bar 91 of the embedded pier bottom section, wherein the solid section steel bar 91 of the pier bottom section and the reinforcement cage 92 are positioned in the solid section 10 of the pier bottom section and are fixedly connected with the solid section 10 of the pier bottom section through on-site concrete pouring. The pier bottom segment is locally thickened towards the outside, and the anti-collision protection structure is achieved.
Connecting steel bars pre-embedded in the base 1, the pier bottom section 2, the middle section 3 and the top cap section 4 are respectively an inner side connecting steel bar 51, an inner side connecting steel bar 52, an inner side connecting steel bar 53, an inner side connecting steel bar 54, an outer side connecting steel bar 61, an outer side connecting steel bar 62 and an outer side connecting steel bar 63, the inner side connecting steel bar 52 and the inner side connecting steel bar 53 respectively penetrate through the pier bottom section 2 and the middle section 3, and one ends of the inner side connecting steel bar 51 and the inner side connecting steel bar 54 are pre-embedded in the base 1 and the top cap section 4 respectively, wherein the lengths of the inner side connecting steel bar 51 and the inner side connecting steel bar 54; outside connecting reinforcement 61 is located 1 top of base, and the bottom of the section 2 at the bottom of the mound, middle section 3, top cap section 4 is pre-buried outside connecting reinforcement 62 respectively, and the top of the section 2 at the bottom of the mound, middle section 3 is pre-buried outside connecting reinforcement 63 respectively, and outside connecting reinforcement 61, outside connecting reinforcement 62, outside connecting reinforcement 63 are located base 1 and the section 2 at the bottom of the mound, the section 2 and middle section 3 at the bottom of the mound, the seam crossing of middle section 3 and top cap section 4 respectively. The connection between the base and the pier bottom segment, between the pier bottom segment and the middle segment, between the middle segments and between the middle segment and the top cap segment is realized by pouring UHPC joints, the upper parts of the UHPC joints are provided with slopes, and UHPC is poured and grouted from the slopes. The embedded inner side connecting steel bars and the embedded outer side connecting steel bars can be connected together through the short steel bars to form U-shaped arrangement.
The bottom of the pier bottom section 2 is provided with a support column 21 and a guard plate 22, the bottom of the middle section 3 is provided with a support column 31 and a guard plate 32, the bottom of the top cap section 4 is provided with a support column 41 and a guard plate 42, the height of the support column 21, the support column 31 and the support column 41 is greater than the height of the embedded steel bar joint, the guard plate is arranged at the inner edge of the pier wall, the support column 21, the support column 31 and the support column 41 respectively extend to the edge of the inner side of the pier bottom section, the middle section and the inner side wall of the top cap section along the inner side of the guard plate 22, the guard plate 32 and the guard plate 42, and the cushion pads (not shown) are respectively arranged at the positions corresponding to the. An upper embedded steel plate 71 is embedded in the support column 21, a lower embedded steel plate 72 is embedded in the position, corresponding to the support column, of the lower section, and a connecting steel plate 73 is welded to the upper embedded steel plate 71 and the lower embedded steel plate 72 through splicing seams.
The inner connecting steel bars 51, the inner connecting steel bars 52, the inner connecting steel bars 53, the inner connecting steel bars 54, the outer connecting steel bars 61, the outer connecting steel bars 62 and the outer connecting steel bars 63 are different in length, the inner connecting steel bars 51, the inner connecting steel bars 52, the inner connecting steel bars 53 and the inner connecting steel bars 54 are respectively positioned on the inner sides of the base 1, the pier bottom section 2, the middle section 3 and the top cap section 4, the outer connecting steel bars 61, the outer connecting steel bars 62 and the outer connecting steel bars 63 are respectively positioned on the outer sides of the base 1, the pier bottom section 2, the middle section 3 and the top cap section 4, the inner connecting steel bars 51, the inner connecting steel bars 52, the inner connecting steel bars 53, the inner connecting steel bars 54 and the outer connecting steel bars 61, the outer connecting steel bars 62 and the outer connecting steel bars 63 are pre-embedded in the base, the pier bottom section, the middle section and, the joint lengths of the steel bars reserved by the inner connecting steel bar 51, the inner connecting steel bar 52, the inner connecting steel bar 53 and the inner connecting steel bar 54, the outer connecting steel bar 61, the outer connecting steel bar 62 and the outer connecting steel bar 63 can be overlapped.
The middle section 3 is a standard middle section, the number of the middle sections is multiple, a steel bar joint is embedded between the standard middle section and the standard middle section, a reinforcing stirrup 10 is bound outside the steel bar joint, and connection is realized through post-pouring UHPC seams.
The top of base 1 is equipped with waterstop 11, the bottom of pier base festival section is equipped with support column 21 and backplate 22, is equipped with waterstop notch 12 on the backplate 22, waterstop notch 12 and the matched use of waterstop 11, the big or small shape phase-match of waterstop notch 12 and waterstop 11.
The guard plates 22, 32 and 42 are provided with a circumferential concrete plate on the outer sides of the prefabricated pier bottom section, the middle section and the top cap section, and are prefabricated together with the pier bottom section, the middle section and the top cap section.
The reinforcement stirrup 10 is formed by splicing a pier bottom section, a middle section and a top cap section in place and is used for hooping the horizontal steel bars of the embedded inner side connecting steel bars and the embedded outer side connecting steel bars on the two sides of the sections.
The UHPC joint is formed by casting in situ to realize the connection of reinforced bars and concrete among segments, the material is ultra-high performance concrete, the upper part of the ultra-high performance concrete can be provided with a certain oblique angle, and the connection area of a component and the UHPC joint is subjected to roughening treatment.
The ultra-high performance concrete (UHPC) is a cement-based composite material with ultra-high mechanical property and ultra-high durability, has excellent properties of ultra-high compressive and tensile strength, high toughness, low permeability, high volume stability and the like, can realize the characteristics of vibration-free, self-leveling, self-compaction and the like, has high connection strength with precast concrete, has strong bond and anchoring capability to reinforcing steel bars, can realize force transfer between the reinforcing steel bars by setting smaller lap joint length of the reinforcing steel bars, and further meets the stress requirements of bending resistance, shearing resistance and the like of joint connection.
A construction method of a prefabricated assembled hollow pier based on UHPC joint comprises the following steps,
the method comprises the following steps: constructing a base at a preset place, embedding connecting steel bars in the base, embedding solid section steel bars of a pier bottom section, binding a steel reinforcement cage on the embedded solid section steel bars of the pier bottom section, installing a water stop belt positioned at the top of the base, and chiseling a connecting region of the top of the base and the solid section of the pier bottom section;
step two: prefabricating a pier bottom section in a factory, chiseling a connecting area, arranging a cushion pad on the top of a base corresponding to a support column and a guard plate, and hoisting the pier bottom section to be spliced with the base and support the pier bottom section on the cushion pad; aligning the pier bottom section waterstop notch with a waterstop on the base, and tightly pressing the waterstop through gravity to finish the installation of a waterstop structure; aligning connecting steel bars pre-buried in a pier bottom section with connecting steel bars pre-buried in a base, arranging the connecting steel bars in a staggered manner, binding reinforcing stirrups outside the connecting steel bars in the horizontal direction, erecting side templates on the side walls of joints, fixing the side templates on the inner walls of the upper and lower sections, forming a post-pouring joint area together with guard plate structures on the upper and lower sections and the pier wall, pouring UHPC (ultra high performance concrete) and maintaining;
step three: pouring concrete of the solid section of the pier bottom, and maintaining;
step four: prefabricating a middle section in a factory, chiseling the area where the middle section is connected with the pier bottom section, arranging a cushion pad at the top of the pier bottom section corresponding to a support column and a guard plate of the middle section, hoisting the middle section, splicing with the pier bottom section and supporting on the cushion pad, and welding an upper embedded steel plate and a lower embedded steel plate through a connecting steel plate; aligning the connecting steel bars pre-buried in the middle section with the connecting steel bars pre-buried in the pier bottom section, arranging the connecting steel bars in a staggered manner, binding reinforcing stirrups outside the connecting steel bars along the horizontal direction, erecting a joint template, pouring UHPC in the joints, and maintaining;
step five: prefabricating a top cap section in a factory, roughening the area where the top cap section is connected with a middle section, arranging a cushion pad at the top of the middle section corresponding to a support column and a protection plate of the top cap section, hoisting the top cap section, splicing the top cap section with the middle section and supporting the top cap section on the cushion pad, and welding an upper embedded steel plate and a lower embedded steel plate through a connecting steel plate; aligning the connecting steel bars pre-buried in the top cap segment with the connecting steel bars pre-buried in the middle segment, arranging the connecting steel bars in a staggered manner, binding reinforcing stirrups outside the connecting steel bars along the horizontal direction, erecting a joint template, pouring UHPC in the joints, and maintaining;
step six: and after the UHPC is poured into all the joints and the maintenance is finished, removing the construction auxiliary measures, and finishing the construction of the prefabricated spliced hollow pier based on the UHPC joints.
When a plurality of middle sections need to be added, a step b is added between the fourth step and the fifth step, a plurality of middle sections are prefabricated in a factory, the connecting area between the middle sections is roughened, a cushion pad is arranged at the position, corresponding to the supporting column and the guard plate, of the middle section at the upper part on the top of the middle section at the lower part, the middle section at the upper part is hoisted, and the middle section at the lower part is spliced and supported on the cushion pad; and aligning the connecting steel bars pre-buried in the middle section of the lower part with the connecting steel bars pre-buried in the middle section of the upper part, arranging the connecting steel bars in a staggered manner, binding reinforcing stirrups outside the connecting steel bars along the horizontal direction, erecting a joint template, pouring UHPC in the joint, and maintaining.
By post-pouring UHPC at the joint through the structure, the positioning and connection of the inter-segment steel bar joint are simple, and the construction difficulty is obviously reduced; the height of the joint is obviously reduced, and the consumption of concrete is small; the segment construction tolerance is large, the precision requirement is low, and the manufacture is convenient; the joints are free from vibration, self-compaction is convenient for pouring, and the construction is simple; the assembly pier has excellent overall performance and can be suitable for high-earthquake areas; the seam has strong durability and is suitable for severe corrosive environments such as cross-sea engineering and the like. Meanwhile, the joints of the prefabricated assembled hollow pier based on the UHPC joints are assembled quickly, the field construction operation time is short, and the efficiency is high.
Claims (10)
1. The utility model provides a hollow pier is assembled in prefabrication based on UHPC seam has pier stud and base, the pier stud is hollow pier stud, its characterized in that: the pier column sequentially comprises a pier bottom section, a middle section and a top cap section from bottom to top, the pier bottom section is positioned at the top of the base, steel bar joints are embedded between the pier bottom section and the base, between the pier bottom section and the middle section and between the middle section and the top cap section, reinforcing stirrups are arranged outside the steel bar joints, connecting steel bars are pre-embedded in the base, the pier bottom section, the middle section and the top cap section, the solid section is arranged at the bottom of the pier bottom section, the hollow section is arranged at the top of the pier bottom section, the solid section of the pier bottom section is connected with the base, the hollow section of the pier bottom section is connected with the middle section, the solid section steel bar of the pier bottom section is pre-embedded at the top of the base, and binding a steel reinforcement cage on the solid section steel bar of the embedded pier bottom section, wherein the solid section steel bar of the pier bottom section and the steel reinforcement cage are positioned in the solid section of the pier bottom section and are fixedly connected with the solid section of the pier bottom section through on-site concrete pouring.
2. The prefabricated assembled hollow pier based on the UHPC joint, as claimed in claim 1, is characterized in that: the embedded connecting steel bar in base, pier bottom segment, middle segment, top cap segment partly is inboard connecting steel bar, and partly is outside connecting steel bar, the bottom of pier bottom segment, middle segment, top cap segment is equipped with support column and backplate, and the height that highly is greater than the embedded steel bar of support column connects, the support column extends to the edge of pier bottom segment, middle segment, top cap segment inside wall along the inboard of backplate to pier bottom segment, middle segment, top cap segment inside wall.
3. The prefabricated assembled hollow pier based on the UHPC joint, as claimed in claim 2, wherein: pre-buried inboard connecting reinforcement and outside connecting reinforcement, both length difference, inboard connecting reinforcement are located base, pier base segment section, middle section, top cap segment inboard, and outside connecting reinforcement is located base, pier base segment section, middle section, top cap segment's the outside, and pre-buried certain length in base, pier base segment section, middle section, top cap segment, inboard connecting reinforcement and outside connecting reinforcement plane position crisscross distribution each other, but the reinforcing bar joint length requirement overlap joint that inboard connecting reinforcement and outside connecting reinforcement reserved.
4. The prefabricated assembled hollow pier based on the UHPC joint, as claimed in claim 1, is characterized in that: the middle sections are standard middle sections, the number of the middle sections is multiple, steel bar joints are embedded between the standard middle sections and the standard middle sections, reinforcing stirrups are bound outside the steel bar joints, and connection is achieved through post-pouring UHPC joints.
5. The prefabricated assembled hollow pier based on the UHPC joint, as claimed in claim 4, wherein: the connection between the base and the pier bottom segment, between the pier bottom segment and the middle segment, between the middle segments and between the middle segment and the top cap segment is realized by pouring UHPC joints, the upper parts of the UHPC joints are provided with slopes, and UHPC is poured and grouted from the slopes.
6. The prefabricated assembled hollow pier based on the UHPC joint, as claimed in claim 1, is characterized in that: the top of base is equipped with the waterstop, the bottom of pier base festival section is equipped with support column and backplate, is equipped with the waterstop notch on the backplate, the waterstop notch cooperatees with the waterstop and uses, the size shape phase-match of waterstop notch and waterstop.
7. The prefabricated assembled hollow pier based on the UHPC joint, as claimed in claim 1, is characterized in that: an upper embedded steel plate is embedded in the support column, a lower embedded steel plate is embedded in the lower section corresponding to the support column, and the connecting steel plate is welded on the upper embedded steel plate and the lower embedded steel plate and passes through splicing seams between the sections.
8. The prefabricated assembled hollow pier based on the UHPC joint, as claimed in claim 7, wherein: the embedded inner side connecting steel bars and the embedded outer side connecting steel bars are connected together through the short steel bars to form U-shaped arrangement.
9. The construction method of the prefabricated assembled hollow pier based on the UHPC joint, as claimed in claim 1, is characterized in that: comprises the following steps of (a) carrying out,
the method comprises the following steps: constructing a base at a preset place, embedding connecting steel bars in the base, embedding solid section steel bars of a pier bottom section, binding a steel reinforcement cage on the embedded solid section steel bars of the pier bottom section, installing a water stop belt positioned at the top of the base, and chiseling a connecting region of the top of the base and the solid section of the pier bottom section;
step two: prefabricating a pier bottom section in a factory, chiseling a connecting area, arranging a cushion pad on the top of the base corresponding to the support column and the guard plate, and hoisting the pier bottom section to be spliced with the base and supporting the pier bottom section on the cushion pad; aligning the pier bottom section waterstop notch with a waterstop on the base, and tightly pressing the waterstop through gravity to finish the installation of a waterstop structure; aligning connecting steel bars pre-buried in a pier bottom section with connecting steel bars pre-buried in a base, arranging the connecting steel bars in a staggered manner, binding reinforcing stirrups outside the connecting steel bars in the horizontal direction, erecting side templates on the side walls of joints, fixing the side templates on the inner walls of the upper and lower sections, forming a post-pouring joint area together with guard plate structures on the upper and lower sections and the pier wall, pouring UHPC (ultra high performance concrete) and maintaining;
step three: pouring concrete of the solid section of the pier bottom, and maintaining;
step four: prefabricating a middle section in a factory, chiseling the area where the middle section is connected with the pier bottom section, arranging a cushion pad at the top of the pier bottom section corresponding to a support column and a guard plate of the middle section, hoisting the middle section, splicing with the pier bottom section and supporting on the cushion pad; welding the upper embedded steel plate and the lower embedded steel plate through a connecting steel plate; aligning the connecting steel bars pre-buried in the middle section with the connecting steel bars pre-buried in the pier bottom section, arranging the connecting steel bars in a staggered manner, binding reinforcing stirrups outside the connecting steel bars along the horizontal direction, erecting a joint template, pouring UHPC in the joints, and maintaining;
step five: prefabricating a top cap section in a factory, roughening the area where the top cap section is connected with a middle section, arranging a cushion pad at the top of the middle section corresponding to a support column and a protection plate of the top cap section, hoisting the top cap section, splicing the top cap section with the middle section and supporting the top cap section on the cushion pad, and welding an upper embedded steel plate and a lower embedded steel plate through a connecting steel plate; aligning the connecting steel bars pre-buried in the top cap segment with the connecting steel bars pre-buried in the middle segment, arranging the connecting steel bars in a staggered manner, binding reinforcing stirrups outside the connecting steel bars along the horizontal direction, erecting a joint template, pouring UHPC in the joints, and maintaining;
step six: and after the UHPC is poured into all the joints and the maintenance is finished, removing the construction auxiliary measures, and finishing the construction of the prefabricated spliced hollow pier based on the UHPC joints.
10. The construction method of the prefabricated assembled hollow pier based on the UHPC joint, as claimed in claim 9, is characterized in that: when a plurality of middle sections need to be added, a step b is added between the fourth step and the fifth step, the middle sections are prefabricated in a factory, the connecting area between the middle sections is roughened, a cushion pad is arranged at the top of the middle section at the lower part and the corresponding part of the supporting column and the protecting plate of the middle section at the upper part, the middle section at the upper part is hoisted, and the middle section at the upper part is spliced with the middle section at the lower part and is supported on the cushion pad; and aligning the connecting steel bars pre-buried in the middle section of the lower part with the connecting steel bars pre-buried in the middle section of the upper part, arranging the connecting steel bars in a staggered manner, binding reinforcing stirrups outside the connecting steel bars along the horizontal direction, erecting a joint template, pouring UHPC in the joint, and maintaining.
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| CN202010030426.7A CN113123221A (en) | 2020-01-10 | 2020-01-10 | Prefabricated assembled hollow pier based on UHPC joint and construction method |
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| CN202010030426.7A CN113123221A (en) | 2020-01-10 | 2020-01-10 | Prefabricated assembled hollow pier based on UHPC joint and construction method |
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