CN111827091A - Prefabricated assembled hollow pier connected through prestress and construction method - Google Patents

Prefabricated assembled hollow pier connected through prestress and construction method Download PDF

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Publication number
CN111827091A
CN111827091A CN202010606644.0A CN202010606644A CN111827091A CN 111827091 A CN111827091 A CN 111827091A CN 202010606644 A CN202010606644 A CN 202010606644A CN 111827091 A CN111827091 A CN 111827091A
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CN
China
Prior art keywords
embedded
steel bars
tenon
segment
cap
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010606644.0A
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Chinese (zh)
Inventor
孙树礼
苏伟
张帅
张雷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Railway Design Corp
China State Railway Group Co Ltd
Original Assignee
China Railway Design Corp
China State Railway Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by China Railway Design Corp, China State Railway Group Co Ltd filed Critical China Railway Design Corp
Priority to CN202010606644.0A priority Critical patent/CN111827091A/en
Publication of CN111827091A publication Critical patent/CN111827091A/en
Pending legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/02Piers; Abutments ; Protecting same against drifting ice
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/20Concrete, stone or stone-like material
    • E01D2101/24Concrete
    • E01D2101/26Concrete reinforced
    • E01D2101/28Concrete reinforced prestressed

Abstract

The invention provides a prefabricated assembled hollow pier connected through prestress and a construction method, and relates to the technical field of bridge construction. The hollow pier sequentially comprises a foundation, a bottom section, a middle section and a top cap section from bottom to top, wherein the top of the foundation is provided with a connecting tenon, the side surface of the connecting tenon is provided with a connecting tenon shear key, and embedded steel bars are arranged around the connecting tenon; the bottom sets up inner wall shear force key and reinforcing bar pre-buried pore when the end section is prefabricated, inner wall shear force key and tenon shear force key mutually correspond, fill high-strength concrete in the middle of the two, reinforcing bar pre-buried pore and the pre-buried reinforcing bar one-to-one on basis, during the construction, penetrate the pre-buried reinforcing bar in the reinforcing bar pre-buried pore, the grout of reperfusion connecting reinforcement is carried out the anchor, when end section atress, pre-buried reinforcing bar, between inner wall shear force key and the high-strength concrete, common atress between high-strength concrete and the tenon shear force key, make both form wholly. The technical problem that the existing joint between the sections is connected only through the full-length prestress and does not meet the requirement when the stress of the joint is large is solved.

Description

Prefabricated assembled hollow pier connected through prestress and construction method
Technical Field
The invention relates to the technical field of bridge construction, in particular to a prefabricated assembled hollow pier connected through prestress and a construction method.
Background
At present, the construction of piers by a prefabrication and assembly method represents the trend of bridge construction towards industrialization and intellectualization, and the application is gradually increased in recent years; the hollow pier is the most common pier type, has the advantages of high rigidity, high adaptability and the like, and the hollow pier section is light in weight, is relatively suitable for being built by a prefabricated assembly method and has more applications in domestic and foreign highways and sea-crossing bridges.
The prefabricated assembled hollow pier is most commonly connected by adopting a prestress method, and all the sections are bonded by adopting epoxy resin glue. When the sections are bonded through epoxy resin glue, prepressing is generally needed during splicing, certain pressure is applied to the epoxy resin glue between joints to ensure the bonding effect, and auxiliary facilities are often needed to be installed; when the segments are spliced, temporary locking measures are often required to be set so as to ensure the stability of the segments in the installation process; a solid section is often required to be arranged at the bottom of the hollow pier, and the splicing difficulty between the solid section and a foundation is high; meanwhile, the joint between the segments is connected only through the full-length prestress and often does not meet the requirement when the stress of the joint is large.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a prefabricated assembled hollow pier connected through prestress and a construction method thereof, so as to solve the prior technical problem that the existing segment-to-segment connection only through the full-length prestress often does not meet the requirement when the joint is stressed greatly.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a prefabricated assembled hollow pier connected through prestress, which comprises a foundation, a bottom section, a middle section and a top cap section from bottom to top, and also comprises: the top of the foundation is provided with a connecting tenon, the connecting tenon and the foundation are integrally cast, the side surface of the connecting tenon is provided with a connecting tenon shear key, and the periphery of the connecting tenon is provided with embedded steel bars; when the bottom section is stressed, the embedded steel bars, the inner wall shear keys and the high-strength concrete, and the high-strength concrete and the connecting tenon shear keys are stressed together to form a whole between the bottom section and the foundation; when the bottom section is prefabricated, a bottom section anchoring block is arranged at the top, a bottom section pre-embedded hole and bottom section thick steel bars are arranged in the bottom section anchoring block, and the bottom section thick steel bars extend out of the top of the bottom section for a certain length; when the middle section is prefabricated, a middle section lower anchoring block is arranged at the bottom, a middle section lower embedded hole channel is arranged in the middle section lower anchoring block, a middle section upper anchoring block is arranged at the top, and a middle section upper embedded hole channel is arranged in the middle section upper anchoring block; when the top cap section is prefabricated, a top cap section anchoring block is arranged at the bottom, and a top cap section pre-embedding hole channel is arranged in the top cap section anchoring block; the foundation, the bottom section, the middle section and the top cap section are pre-embedded with prestressed pipelines, and are connected by penetrating through long prestressed bundles, so that the connection performance among the sections is ensured; the full-length prestressed tendon comprises a prestressed tendon anchoring end and a prestressed tendon tensioning end, wherein the prestressed tendon anchoring end is arranged in the foundation and is connected through a self-locking anchorage device, the full-length prestressed tendon penetrates through the top end of the foundation and then is locked in the foundation, and the tensioning end at the top end of the top cap section is tensioned to seal the anchor with the prestressed tendon.
In any of the above technical solutions, further, the bottom section and the middle section are connected by a bottom section thick steel bar, the middle sections and the middle section and the top cap section are connected by a middle section thick steel bar, and during assembling, each thick steel bar is constructed first, and then the full-length prestressed bundles are constructed.
In any of the above technical solutions, further, the anchor blocks are dispersedly arranged on the inner side of the pier wall of each segment, and are prefabricated together with each segment, and the positions of the anchor blocks between adjacent prefabricated segments correspond to each other.
In any of the above technical solutions, further, the pore channels are pre-embedded in each anchor block, and the pre-embedded pore channels between adjacent segments correspond to each other.
In any of the above technical solutions, further, the upper and lower ends of each anchor block are thick steel bar tensioning ends or anchor ends.
In any of the above technical solutions, further, the planes and the height directions of the connecting tenon shear keys and the inner wall shear keys are staggered with each other, and the extending lengths of the shear keys are overlapped with each other by a certain length.
In any of the above technical solutions, further, the embedded steel bars on the foundation extend into the embedded hole of the bottom segment, and the embedded hole of the bottom segment is filled with grouting material.
The invention provides a construction method of a prefabricated assembled hollow pier connected through prestress, which is characterized by comprising the following steps:
firstly, constructing a foundation, prefabricating a bottom section, a middle section and a top cap section to be assembled;
secondly, laying high-strength mortar at the bottom joint on the top surface of the foundation, hoisting the bottom section for mounting by a mortar sitting method, penetrating embedded steel bars into embedded steel bar channels, injecting grouting slurry of the embedded steel bar channels, pouring high-strength concrete between the connecting tenon and the inner wall of the bottom section, and filling gaps between the shear keys of the connecting tenon and the shear keys of the inner wall with the high-strength concrete;
laying an intermediate joint epoxy resin adhesive on the top surface of the intermediate section, hoisting the intermediate section, penetrating a lower embedded pore passage of the intermediate section into the bottom section thick steel bar, tensioning the bottom section thick steel bar, and constructing an intermediate section seal anchor;
laying an intermediate joint epoxy resin adhesive on the top surface of the lower intermediate section, hoisting the upper intermediate section, enabling lower pre-buried pore passages of the upper intermediate section to correspond to the upper pre-buried pore passages of the lower intermediate section one by one, penetrating intermediate section thick steel bars, tensioning the intermediate section thick steel bars, and constructing intermediate section sealing anchors;
laying middle joint epoxy resin glue on the top surface of the middle section, hoisting the top cap section, enabling the pre-buried pore channels of the top cap section to correspond to the pre-buried pore channels on the middle section one by one, penetrating the thick steel bars of the middle section, tensioning the thick steel bars of the middle section, and constructing the top cap section sealing anchor;
step six, sequentially penetrating full-length prestressed bundles into the top cap segment, the middle segment, the bottom segment and pre-embedded prestressed pipelines in the foundation from the top end of the top cap segment, tensioning from a tensioning end at the top end of the top cap segment, and sealing the anchor;
and seventhly, performing pipeline grouting on the pipeline with the long prestressed bundles and the embedded pore canals of the coarse steel bars.
The invention has the beneficial effects that:
the invention provides a precast assembled hollow pier connected by prestress and a construction method thereof, which can obtain the following effects:
1. arranging local prestressed thick steel bars between the prefabricated sections, and prepressing the epoxy resin adhesive through the prestressed thick steel bars to ensure the bonding effect;
2. the sections are temporarily locked through the pre-fabricated inter-section prestressed thick steel bars, so that the stability of the sections in the installation process is ensured, and other auxiliary facilities are not required to be installed;
3. the connection between the segments is ensured by the combined action of the full-length prestress arranged on the pier wall of the hollow pier and the local prestress arranged between the segments; the local prestress strengthens the spliced seam, so that the stress at the seam is safer and more reliable, the local prestress utilizes the thick steel bars in the construction process, the combination of permanent facilities and temporary measures is realized, and the cost is saved;
4. the splicing seam between the bottom section and the foundation is stressed greatly, the foundation is provided with the connecting tenon, the shear key and the embedded steel bar, the shear key of the inner wall and the high-strength concrete, and the shear key of the connecting tenon are stressed together with the bottom section to form a whole.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic elevation structure view of a prefabricated assembled hollow pier connected by prestress according to an embodiment of the present invention;
fig. 2 is a schematic view of a foundation structure of a prefabricated assembled hollow pier connected by prestress according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a bottom section of a prefabricated assembled hollow pier connected by prestress according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a middle section of a prefabricated assembled hollow pier connected by prestress according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a top cap segment of a prefabricated assembled hollow pier connected by prestress according to an embodiment of the present invention;
fig. 6 is a bottom joint assembly schematic diagram of a prefabricated assembled hollow pier connected through prestress according to an embodiment of the present invention;
fig. 7 is a schematic view of the assembly of a middle joint of a prefabricated hollow pier connected by prestress according to an embodiment of the present invention.
Icon:
1-a base;
101-embedding reinforcing steel bars;
102-a joint shear key;
103-connecting tenon;
2-a bottom segment;
201-embedding a pore channel in a reinforcing steel bar;
202-inner wall shear key;
203-high strength concrete;
204-bottom segment anchor block;
205-bottom segment pre-buried pore channel;
206-bottom section thick steel bars;
3-an intermediate section;
301-intermediate segment lower anchor block;
302-pre-embedding pore canals below the middle section;
303-middle section sealing anchor;
304-an upper anchor block of the middle section;
305-pre-burying pore canals on the middle section;
306-middle section heavy steel bars;
4-a top cap segment;
401-top cap segment anchor block;
402-top cap segment pre-buried tunnels;
403-top cap segment sealing;
5-bottom seam;
6-middle joint;
7-prestressed pipe;
8-full length prestressed tendons;
801-prestressed tendon anchoring end;
802-prestressed tendon stretching end;
803-pre-stressed tendon sealing anchor;
9-grouting the pipeline;
10-grouting material.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
As shown in fig. 1 to 5, the corresponding schematic diagrams of the structure of the prefabricated assembled hollow pier connected by the prestress provided by the embodiment of the present invention are further described with reference to fig. 1 to 5, and the specific scheme is as follows:
hollow pier is assembled in prefabrication through prestressing force connection that this embodiment provided includes by down and on in proper order including basis 1, end section 2, middle section 3 and top cap section 4, still includes: the top of the foundation 1 is provided with a connecting tenon 103, the connecting tenon 103 and the foundation 1 are integrally cast, the side surface of the connecting tenon 103 is provided with a connecting tenon shear key 102, and the periphery of the connecting tenon 103 is provided with embedded steel bars 101; when the bottom section 2 is prefabricated, the thickness of the inner side wall of the bottom is locally thickened, the side face of the thickened part is provided with an inner wall shear key 202, a steel bar embedded hole 201 is arranged in the thickened part, the inner wall shear key 202 corresponds to the connecting tenon shear key 102, high-strength concrete 203 is filled between the inner wall shear key 202 and the connecting tenon shear key, the steel bar embedded hole 201 corresponds to the embedded steel bars 101 on the foundation 1 one by one, during construction, the embedded steel bars 101 penetrate into the steel bar embedded hole 201, connecting steel bar slurry is poured for anchoring, and when the bottom section 2 is stressed, the embedded steel bars 101, the inner wall shear key 202 and the high-strength concrete 203, and the high-strength concrete 203 and the connecting tenon shear key 102 are stressed together, so that the bottom section; when the bottom section 2 is prefabricated, a bottom section anchoring block 204 is arranged at the top, a bottom section pre-buried hole 205 and bottom section thick steel bars 206 are arranged in the bottom section anchoring block 204, and the bottom section thick steel bars 206 extend out of the top of the bottom section 2; when the middle section 3 is prefabricated, a middle section lower anchoring block 301 is arranged at the bottom, a middle section lower embedded hole channel 302 is arranged in the middle section lower anchoring block 301, a middle section upper anchoring block 304 is arranged at the top, and a middle section upper embedded hole channel 305 is arranged in the middle section upper anchoring block 304; when the top cap section 4 is prefabricated, a top cap section anchoring block 401 is arranged at the bottom, and a top cap section pre-embedding hole channel 402 is arranged in the top cap section anchoring block 401; the foundation 1, the bottom section 2, the middle section 3 and the top cap section 4 are pre-embedded with prestressed pipelines 7 which are connected by penetrating through long prestressed bundles 8, so that the connection performance among the sections is ensured; generally, the prestressed tendon 8 comprises prestressed tendon anchoring ends 0 and 8 and a prestressed tendon tensioning end 802, wherein the prestressed tendon anchoring end 801 of the prestressed tendon is arranged in the foundation 1 and is connected through a self-locking anchorage device, the prestressed tendon 8 penetrates through the top end and then is locked in the foundation 1, the tensioning end at the top end of the top cap segment 4 is tensioned, and the prestressed tendon seals the anchor 803.
According to the prefabricated assembled hollow pier connected through the prestress, the local prestress thick steel bars are arranged between the prefabricated sections, and the epoxy resin adhesive is pre-pressed through the prestress thick steel bars, so that the bonding effect is guaranteed; the sections are temporarily locked through the pre-fabricated inter-section prestressed thick steel bars, so that the stability of the sections in the installation process is ensured, and other auxiliary facilities are not required to be installed; the connection between the segments is ensured by the combined action of the full-length prestress arranged on the pier wall of the hollow pier and the local prestress arranged between the segments; the local prestress strengthens the spliced seam, so that the stress at the seam is safer and more reliable, the local prestress utilizes the thick steel bars in the construction process, the combination of permanent facilities and temporary measures is realized, and the cost is saved; the stress of the splicing seam between the bottom section 2 and the foundation 1 is large, the connecting tenon 103, the shear key and the embedded steel bar 101 are arranged on the foundation 1, and when the bottom section 2 is stressed, the embedded steel bar 101, the inner wall shear key 202 and the high-strength concrete 203, and the high-strength concrete 203 and the connecting tenon shear key 102 are stressed together, so that the two form a whole.
Besides, the concrete structure of the hollow pier of the embodiment further includes the following contents:
the alternative of this embodiment is that, bottom section 2 and middle section 3 are connected through bottom section thick steel bar 206, and middle section 3 is connected each other and middle section 3 and top cap section 4 through middle section thick steel bar 306, and each thick steel bar is constructed earlier during the assembly, and then full length prestressing tendons 8 are constructed.
Further, when the foundation 1 and the bottom section 2 are assembled, the foundation 1 is connected with the bottom section 2 through a bottom joint 5 mortar setting method, the bottom joint 5 is made of high-strength mortar, the embedded steel bars 101 penetrate through the steel bar embedded hole channels 201, grouting is carried out, and high-strength concrete 203 is poured between the connecting tenon 103 and the inner wall of the bottom section 2.
In addition, the bottom section 2 is connected with the middle section 3 through a middle joint 6 when being assembled, the middle joint 6 adopts epoxy resin glue, the middle section lower anchoring block 302 penetrates into the bottom section thick steel bar 206, and the thick steel bar is tensioned; middle section 3 links to each other through middle seam 6 when assembling with middle section 3, middle section 3 and hood section 4, and middle seam 6 adopts epoxy glue, counterpoints the pre-buried pore of adjacent section each other, stretch-draw coarse reinforcement.
The alternative of this embodiment is that the anchor blocks are dispersedly arranged on the inner side of the pier wall of the segment, and are prefabricated together with the segment, and the positions of the anchor blocks between the adjacent prefabricated segments correspond to each other.
The optional scheme of this embodiment is, pre-buried pore in the anchor piece, and the pre-buried pore between adjacent each section corresponds each other to the smooth and easy penetration of thick reinforcing bar.
An alternative to this embodiment is that the upper and lower ends of the anchor block are rebar tensioning or anchoring ends.
An alternative of this embodiment is that the plane and the height direction of the connecting tenon shear key 102 and the inner wall shear key 202 are staggered, and the extending lengths of the shear keys overlap each other by a certain length, and the length is determined according to circumstances and is not described herein again.
The alternative of this embodiment is that, embedded steel bar 101 on basis 1 stretches into and reserves in the pre-buried pore of bottom segment 2, and the pre-buried pore of bottom segment 2 is filled with mud jacking 10.
The construction method of the prefabricated assembled hollow pier connected through the prestress comprises the following steps:
firstly, constructing a foundation 1, prefabricating a bottom section 2, a middle section 3 and a top cap section 4 to be assembled;
secondly, paving high-strength mortar at the bottom joint 5 on the top surface of the foundation 1, hoisting the bottom section 2 for mounting by a mortar sitting method, penetrating the embedded steel bars 101 into the steel bar embedded channels 201, injecting the steel bar embedded channel 201 grouting material 10, pouring high-strength concrete 203 between the connecting tenon 103 and the inner wall of the bottom section 2, and filling gaps between the connecting tenon shear keys 102 and the inner wall shear keys 202 with the high-strength concrete 203;
step three, paving an epoxy resin adhesive of a middle joint 6 on the top surface of the middle section 3, hoisting the middle section 3, penetrating the lower anchoring block 302 of the middle section into the thick reinforcing steel bar 206 of the bottom section, tensioning the thick reinforcing steel bar 206 of the bottom section, and constructing a middle section sealing anchor 303;
fourthly, laying epoxy resin glue of a middle joint 6 on the top surface of the lower middle section 3, hoisting the upper middle section 3, enabling the lower anchoring blocks 302 of the upper middle section to correspond to the pre-buried ducts 305 on the lower middle section one by one, penetrating the thick steel bars 306 of the middle section, tensioning the thick steel bars 306 of the middle section, and constructing a sealing anchor 303 of the middle section;
laying epoxy resin glue of a middle joint 6 on the top surface of the middle section 3, hoisting the top cap section 4, enabling the top cap section pre-embedded pore passages 402 to correspond to the pre-embedded pore passages 305 on the middle section one by one, penetrating the middle section thick steel bars 306, tensioning the middle section thick steel bars 306, and constructing a top cap section seal anchor 403;
step six, sequentially penetrating full-length prestressed bundles 8 into pre-buried prestressed pipelines 7 in the top cap section 4, the middle section 3, the bottom section 2 and the foundation 1 from the top end of the top cap section 4, and tensioning and sealing the anchor from a tensioning end at the top end of the top cap section 4;
and seventhly, performing pipeline grouting 9 in the pipeline with the long prestressed bundles 8 and the pre-buried pore canals of the coarse steel bars.
In summary, according to the structure of the prefabricated hollow pier connected by the prestress and the construction method thereof provided by the embodiment, the full-length prestress is arranged on the pier wall of the hollow pier, the local prestress is arranged between the segments, the connection between the segments is formed by the full-length prestress and the local prestress, and the local prestress simultaneously meets the assembly requirement in the construction process; because the bottom joint 5 is stressed greatly, the foundation 1 is provided with the embedded steel bars 101 and the connecting tenons 103, so that the stress requirement is met; the joint structure has strong joint of the segment splicing seam, less construction auxiliary facilities, simple assembly between the segment and the foundation 1 and capability of meeting the stress requirement of the joint.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (8)

1. The utility model provides a hollow pier is assembled in prefabrication through prestressing force connection, by down and on in proper order including basis (1), bottom segment (2), middle segment (3) and top cap segment (4), its characterized in that still includes:
the top of the foundation (1) is provided with a connecting tenon (103), the connecting tenon (103) and the foundation (1) are integrally poured, the side surface of the connecting tenon (103) is provided with a connecting tenon shear key (102), and embedded steel bars (101) are arranged around the connecting tenon (103);
when the bottom section (2) is prefabricated, the thickness of the inner side wall of the bottom is locally thickened, an inner wall shear key (202) is arranged on the side surface of the thickened part, a steel bar pre-embedded pore passage (201) is arranged inside the thickened part, the inner wall shear key (202) and the connecting tenon shear key (102) are mutually corresponding, high-strength concrete (203) is filled between the inner wall shear key and the connecting tenon shear key, the steel bar pre-buried pore canals (201) correspond to the pre-buried steel bars (101) on the foundation (1) one by one, penetrating the embedded steel bars (101) into the steel bar embedded pore canal (201), then pouring connecting steel bar slurry for anchoring, when the bottom section (2) is stressed, the embedded steel bars (101), the space between the inner wall shear key (202) and the high-strength concrete (203), and the space between the high-strength concrete (203) and the connecting tenon shear key (102) are stressed together, so that the bottom section (2) and the foundation (1) are integrated;
when the bottom section (2) is prefabricated, a bottom section anchoring block (204) is arranged at the top, a bottom section pre-embedded hole channel (205) and bottom section thick steel bars (206) are arranged in the bottom section anchoring block (204), and the bottom section thick steel bars (206) extend out of the top of the bottom section (2).
When the middle section (3) is prefabricated, a middle section lower anchoring block (301) is arranged at the bottom, a middle section lower embedded hole channel (302) is arranged in the middle section lower anchoring block (301), a middle section upper anchoring block (304) is arranged at the top, and a middle section upper embedded hole channel (305) is arranged in the middle section upper anchoring block (304);
when the top cap segment (4) is prefabricated, a top cap segment anchoring block (401) is arranged at the bottom, and a top cap segment pre-buried duct (402) is arranged in the top cap segment anchoring block (401);
the foundation (1), the bottom section (2), the middle section (3) and the top cap section (4) are pre-embedded with prestressed pipelines (7) and are connected by penetrating through long prestressed tendons (8), so that the connection performance among the sections is ensured; the full-length prestressed tendon (8) comprises a prestressed tendon anchoring end (801) and a prestressed tendon tensioning end (802), wherein the prestressed tendon anchoring end (801) is arranged in the foundation (1) and is connected through a self-locking anchorage device, the full-length prestressed tendon (8) penetrates through the top end of the foundation (1) and then is locked in the foundation (1), tensioning is carried out through the tensioning end at the top end of the top cap segment (4), and the prestressed tendon sealing anchor (803) is sealed.
2. The precast assembled hollow pier connected by prestress according to claim 1, wherein the bottom segment (2) and the middle segment (3) are connected by bottom segment thick steel bars (206), the middle segments (3) are connected by middle segment thick steel bars (306), and the middle segment (3) and the coping segment (4) are connected by middle segment thick steel bars (306), and the thick steel bars are constructed firstly and then the full length prestress beam (8) is constructed during assembling.
3. The precast split hollow pier connected by prestress according to claim 1, wherein the anchor blocks are dispersedly arranged inside the pier wall of each segment, and precast together with the segments, and the positions of the anchor blocks between the adjacent precast segments correspond to each other.
4. The precast assembled hollow pier connected by prestress according to claim 1, wherein the pre-buried pore passages in each anchor block correspond to the pre-buried pore passages between adjacent segments.
5. The precast split hollow pier connected by prestress according to claim 1, wherein the upper and lower ends of each anchor block are a thick steel bar tension end or an anchor end.
6. The precast assembled hollow pier connected through prestress according to claim 1, wherein the plane and height directions of the connecting tenon shear key (102) and the inner wall shear key (202) are staggered with each other, and the extending lengths of the shear keys are overlapped with each other by a certain length.
7. The precast assembled hollow pier connected through the prestress according to claim 1, wherein the embedded steel bars (101) on the foundation (1) extend into the embedded hole channels (205) reserved in the bottom sections, and the embedded hole channels (205) of the bottom sections are filled with grouting material (10).
8. A construction method of a prefabricated assembled hollow pier connected through prestress is characterized by comprising the following steps:
firstly, constructing a foundation (1), prefabricating a bottom section (2), a middle section (3) and a top cap section (4) to be assembled;
secondly, paving high-strength mortar at a bottom joint (5) on the top surface of the foundation (1), hoisting the bottom section (2) for installation by a mortar sitting method, penetrating embedded steel bars (101) into a steel bar embedded hole channel (201), injecting a steel bar embedded hole channel (201) grouting material (10), pouring high-strength concrete (203) between the connecting tenon 103 and the inner wall of the bottom section (2), and filling gaps between the connecting tenon shear keys (102) and the inner wall shear keys (202) with the high-strength concrete (203);
laying epoxy resin glue of an intermediate joint (6) on the top surface of the intermediate section (3), hoisting the intermediate section (3), penetrating a lower embedded pore passage (302) of the intermediate section into the bottom section thick steel bar (206), tensioning the bottom section thick steel bar (206), and constructing an intermediate section seal anchor (303);
fourthly, laying epoxy resin glue of a middle joint (6) on the top surface of the lower middle section (3), hoisting the upper middle section (3), enabling lower embedded ducts (302) of the upper middle section to correspond to upper embedded ducts (305) of the lower middle section one by one, penetrating middle section thick steel bars (306), tensioning the middle section thick steel bars (306), and constructing a middle section seal anchor (303);
laying epoxy resin glue of a middle joint (6) on the top surface of the middle section (3), hoisting the top cap section (4), enabling the top cap section pre-embedded pore passages (402) to correspond to the pre-embedded pore passages (305) on the middle section one by one, penetrating middle section coarse steel bars (306), tensioning the middle section coarse steel bars (306), and constructing a top cap section sealing anchor (403);
penetrating full-length prestressed bundles (8) into the top cap section (4), the middle section (3), the bottom section (2) and a pre-buried prestressed pipeline (7) in the foundation (1) in sequence from the top end of the top cap section (4), and tensioning and sealing the anchor from a tensioning end at the top end of the top cap section (4);
and seventhly, grouting the pipeline (9) in the pipeline with the long prestressed tendons (8) and the pre-buried pore canals of the coarse steel bars.
CN202010606644.0A 2020-06-29 2020-06-29 Prefabricated assembled hollow pier connected through prestress and construction method Pending CN111827091A (en)

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CN202010606644.0A CN111827091A (en) 2020-06-29 2020-06-29 Prefabricated assembled hollow pier connected through prestress and construction method

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Application Number Priority Date Filing Date Title
CN202010606644.0A CN111827091A (en) 2020-06-29 2020-06-29 Prefabricated assembled hollow pier connected through prestress and construction method

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Publication Number Publication Date
CN111827091A true CN111827091A (en) 2020-10-27

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