CN101831875A - Precast assembly process of prestressed concrete cylindrical hollow pier - Google Patents
Precast assembly process of prestressed concrete cylindrical hollow pier Download PDFInfo
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- CN101831875A CN101831875A CN 201010195412 CN201010195412A CN101831875A CN 101831875 A CN101831875 A CN 101831875A CN 201010195412 CN201010195412 CN 201010195412 CN 201010195412 A CN201010195412 A CN 201010195412A CN 101831875 A CN101831875 A CN 101831875A
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Abstract
The invention relates to a precast assembly process of a prestressed concrete cylindrical hollow pier. The traditional process has the defects that construction period is longer, the cast-in-situ construction is greatly influenced by environment, and the construction quality can not be controlled easily. The precast assembly process of the prestressed concrete cylindrical hollow pier, which is provided by the invention, mainly comprises the following ten steps of: preparing a precast component, casting a bearing platform in situ, installing a transition section, installing a standard section, installing a pier top section, stretching a prestressed thick steel bar and anchoring at the part of a stretching and anchoring construction groove, grouting, casting concrete at the part of the prestressed stretching and anchoring construction groove at the upper end of the pier top section, protecting the anchoring end of the prestressed thick steel bar in a sealing way, and the like. The invention can save a large number of building materials, fully exert the action of high-strength materials and simultaneously shorten the construction period, is beneficial to quality control, and has high construction efficiency.
Description
Technical field
The present invention relates to the design and the technical field of construction of highway bridge bridge pier, be specifically related to the design and the construction technology of uniform section cylinder bridge pier, further relate to a kind of precast assembly process of prestressed concrete cylindrical hollow pier.
Background technology
At present, the column type pier of domestic highway bridge adopts solid section mostly, and material adopts ordinary reinforced concrete, and its construction technology mainly adopts cast-in-place on the spot method.The main shortcoming of this traditional handicraft is: long, cast-in-place on the spot construction of construction period is subjected to the influence of environment big, construction quality is wayward.With the Urban Bridge is example, after finishing foundation construction, in the follow-up construction of bridge pier, each operation all need be carried out (assembling reinforcement, arrangement template, fluid concrete, form removal, health etc.) at the scene, finish in the pier stud construction, after concrete reaches certain intensity, can carry out the construction of superstructure, this is a restriction to the higher project of construction period; Simultaneously, because the cast-in-site construction need take bigger place, this technological process is a very adverse influence to crowded day by day urban traffic system.Being example with marine bridge construction again, if adopt the job practices of cast-in-site, will be very big to the input of interim operation platform, suspension bridge; Owing to be subjected to the influence of morning and evening tides, typhoon, cast-in-site also is disadvantageous to duration control simultaneously.
Based on above reason, at sea in the bridge construction, begun to adopt the precast assembly technology at present, technology commonly used at present is such: at the joint of prefabricated component reserved steel bar, after prefabricated component lifting put in place, adopt method such as welding to make reinforcing bar connection, cast-in-place concrete wet joint then.The advantage of this method is the advanced technologies that has adopted this energy of precast assembly to improve marine bridge construction quality and shortened the construction period, but this technology is in traditional wet joint worker method that remains of the joint of prefabricated component employing---field Welding reserved steel bar, cast joint concrete.This job practices is welded at the scene and poured into a mould still needs to set up corresponding operation platform in the concrete process of joint, and after construction, still to carry out the maintenance of certain hour to the concrete structure of back cast, be unfavorable for concrete Quality Control and raising efficiency of construction and reduction of erection time.
Summary of the invention
The present invention will provide a kind of precast assembly process of prestressed concrete cylindrical hollow pier, is unfavorable for quality control, efficiency of construction problem low and long in time limit with what overcome that prior art exists.
A kind of precast assembly process of prestressed concrete cylindrical hollow pier comprises the steps: successively
One, prepare precast segment:
The cross section is circular hollow pier stud: comprise two kinds of changeover portion and standard paragraphs, wherein an end of changeover portion is provided with installation step, and the two ends of standard paragraphs are provided with installation step;
Solid pier top section, a section lower end, pier top be provided with can with the nested installation step that cooperates of installation step on the standard paragraphs, the outer ring of upper end is provided with the prestressed stretch-draw anchor construction groove of annular;
Be vertically arranged with the preformed hole of up/down perforation in the annular wall of said hollow pier stud, section relevant position, pier top also is provided with the preformed hole of up/down perforation longitudinally, the uniform setting on the ring section of hollow pier stud and pier top section of described preformed hole; An end of preformed hole is provided with the connector preformed groove in the said standard paragraphs;
Two, cast-in-site cushion cap, the preformed groove of the good annular of construction on cushion cap, pre-buried good prestressed thick reinforcement in cushion cap;
Three, changeover portion is installed: installation step one end of changeover portion is made progress, prestressed thick reinforcement penetrates the preformed hole in changeover portion 1 annular wall, the lower end of changeover portion is arranged in the preformed groove, and the slit between preformed groove and the changeover portion root sidewall is filled with cement mortar;
Four, the corresponding position of connector preformed groove in standard paragraphs connects prestressed thick reinforcement with connector;
Five, installation code section: prestressed thick reinforcement is penetrated preformed hole in the standard paragraphs annular wall, the nested cooperation of installation step of the installation step of standard paragraphs lower end and changeover portion upper end;
Six, repeat " step 4 and five ", until installing all standard paragraphs;
Seven, pier top section is installed: prestressed thick reinforcement penetrates the preformed hole in the section of pier top, the installation step of section lower end, pier top and nested cooperation of installation step of standard paragraphs upper end;
Eight, stretch-draw prestressing force bar reinforcement and in the place's anchoring of stretch-draw anchor construction groove;
Nine, mud jacking;
Ten, at the prestressed stretch-draw anchor construction groove place of section upper end, pier top fluid concrete, close and protect is carried out in the anchoring termination of prestressed thick reinforcement.
Above-mentioned standard paragraphs has multiple length selective, can be used in combination as required in the use.
In recent years, along with the continuous development of material science and the progress of bridge design technology, bridge pier structure develops towards the direction of light-duty, high-strength and rapid construction, design concept of the present invention resolves into the bridge pier pier shaft some light-duty parts exactly, concentrated prefabricated in factory or precast yard, the scene that transports to again is spliced into bridge pier.Compared with prior art, advantage of the present invention is:
1, saves constructional materials: satisfying under the prerequisite of structure stress, can reduce the use amount of concrete material, open circles stub with the 120cm diameter is an example, if adopt the wall thickness of 30cm, the concrete consumption in cross section is compared solid section can reduce about 25%, simultaneously because alleviating of pier shaft deadweight can reduce the engineering quantity of bottom pile foundation, the structure design of a kind of low-carbon (LC) of can yet be regarded as.
2, give full play to the effect of Materials with High Strength: pier shaft can adopt the concrete material of higher level, owing to adopted the prefabricated structure manufacture mode in workshop, the fraction height of strength on concrete material; Because adopted prestressed thick reinforcement, also can be the bearing capacity that pier shaft provides higher level simultaneously, there is precompression in pier shaft in addition, has reduced the generation in pier shaft crack, has improved durability of structures.
3, shorten the construction period: owing to adopted the prefabricated technology in workshop, can in the foundation pile of construction bottom, carry out the prefabricated of bridge pier simultaneously, after foundation pile construction finishes, can in the shortest time, finish the construction of bridge pier, be the time of the construction saves valuable on top.This is for being located in the economic and social benefit that Urban Bridge construction under the heavy traffic situation has highly significant.Same for the marine bridge construction that is subjected to wave and weather effect, this construction technology has remarkable advantages undoubtedly.
4, be beneficial to quality control: when carrying out Bridge Pier Construction according to traditional cast-in-site construction technology, need carry out assembling reinforcement at the construction field (site), settle operations such as template, fluid concrete, form removal, health, and the quality of cast-in-site construction often is subjected to the influence of external environment bigger, simultaneously because constructor's quantity is more, the construction plant scale is big, personnel's construction level is very different in addition, causes the work of site construction management and quality inspection comparatively heavy, and the difficulty of quality control on construction is big.The prefabricated technology in workshop then can overcome above-mentioned shortcoming fully, owing to adopted the pattern prefabricated, that batch production is produced of concentrating, all can control from construction equipment, material, personnel, technology etc., can improve workmanship significantly in strict accordance with unified qulity management system.
5, efficiency of construction height: in traditional cast-in-site work progress, the construction of bridge pier generally will be after the construction of pile foundation be finished, could begin to carry out, temporal sequencing has determined the two not carry out simultaneously, and this must cause the prolongation of duration and the reduction of efficiency of construction.The prefabricated technology in workshop then can be avoided this situation: owing to when the construction pile foundation, can begin the prefabricated work of bridge pier simultaneously, after foundation pile construction is finished, can finish the construction of bridge pier in the short period, create advantage for the top construction, saved the duration, improved efficiency of construction.
Description of drawings
Fig. 1 is an assembly structure schematic diagram of the present invention;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the structural representation of pier top section;
Fig. 4 is the structural representation of standard paragraphs;
Fig. 5 is the structural sections sectional schematic diagram that has installation step.
Description of reference numerals is as follows:
The 1-changeover portion, 2-standard paragraphs, 3-pier top section, 4-preformed hole, 5-prestressed thick reinforcement, 6-cushion cap, 7-preformed groove, 8-installation step, 9-connector preformed groove, 10-prestressed stretch-draw anchor construction groove.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
Referring to Fig. 1～Fig. 5, a kind of precast assembly process of prestressed concrete cylindrical hollow pier comprises the steps: successively
One, prepare precast segment:
The cross section is circular hollow pier stud: comprise 2 two kinds of changeover portion 1 and standard paragraphs, wherein an end of changeover portion 1 is provided with installation step 8, and the two ends of standard paragraphs 2 are provided with installation step 8;
Solid pier top section 3, section 3 lower ends, pier top be provided with can with the nested installation step that cooperates of installation step on the standard paragraphs 2, the outer ring of upper end is provided with the prestressed stretch-draw anchor construction groove 10 of annular;
Be vertically arranged with the preformed hole 4 of up/down perforation in the annular wall of said hollow pier stud, section relevant position, pier top also is provided with the preformed hole 4 of up/down perforation longitudinally, the uniform setting on the ring section of hollow pier stud and pier top section 3 of described preformed hole 4; An end of preformed hole 4 is provided with connector preformed groove 9(and is used for holding the connector bigger slightly than prestressed thick reinforcement external diameter in the said standard paragraphs 2);
Two, the cast-in-site cushion cap 6, the preformed groove 7 of the good annular of construction on cushion cap 6, pre-buried good prestressed thick reinforcement in cushion cap 6;
Three, changeover portion is installed: installation step 8 one ends of changeover portion 1 are made progress, prestressed thick reinforcement 5 penetrates the preformed hole 4 in changeover portion 1 annular wall, the lower end of changeover portion 1 is arranged in the preformed groove 7, and the slit between preformed groove 7 and the changeover portion 1 root sidewall is filled with cement mortar;
Four, the corresponding position of connector preformed groove 9 in standard paragraphs 2 connects prestressed thick reinforcement with connector;
Five, the installation code section 2: prestressed thick reinforcement 5 is penetrated preformed hole 4 in standard paragraphs 2 annular wall, the nested cooperation of installation step of the installation step of standard paragraphs 2 lower ends and changeover portion 1 upper end;
Six, repeat " step 4 and five ", until installing all standard paragraphs;
Seven, pier top section 3 is installed: prestressed thick reinforcement 5 penetrates the preformed hole 4 in the pier top section 3, the installation step of section 3 lower ends, pier top and nested cooperation of installation step of standard paragraphs 2 upper ends;
Eight, stretch-draw prestressing force bar reinforcement and in the 10 places anchoring of stretch-draw anchor construction groove;
Nine, mud jacking;
Ten, at prestressed stretch-draw anchor construction groove 10 place's fluid concretes of section 3 upper ends, pier top, close and protect is carried out in the anchoring termination of prestressed thick reinforcement 5.
Claims (2)
1. a precast assembly process of prestressed concrete cylindrical hollow pier comprises the steps: successively
One, prepare precast segment:
The cross section is circular hollow pier stud: comprise (2) two kinds of changeover portion (1) and standard paragraphs, wherein an end of changeover portion (1) is provided with installation step (8), and the two ends of standard paragraphs (2) are provided with installation step (8);
Solid pier top section (3), section (3) lower end, pier top are provided with and can go up the nested installation step that cooperates of installation step with standard paragraphs (2), and the outer ring of upper end is provided with the prestressed stretch-draw anchor construction groove (10) of annular;
Be vertically arranged with the preformed hole (4) of up/down perforation in the annular wall of said hollow pier stud, section relevant position, pier top also is provided with the preformed hole of up/down perforation (4) longitudinally, described preformed hole (4) uniform setting on the ring section of hollow pier stud and pier top section (3); An end of preformed hole (4) is provided with connector preformed groove (9) in the said standard paragraphs (2);
Two, cast-in-site cushion cap (6) is gone up the good annular preformed groove (7) of construction, pre-buried good prestressed thick reinforcement in cushion cap (6) at cushion cap (6);
Three, changeover portion is installed: installation step (8) one ends of changeover portion (1) are made progress, prestressed thick reinforcement (5) penetrates the preformed hole (4) in changeover portion (1) annular wall, the lower end of changeover portion (1) is arranged in the preformed groove (7), and the slit between preformed groove (7) and changeover portion (1) the root sidewall is filled with cement mortar;
Four, the corresponding position of connector preformed groove (9) in standard paragraphs (2) connects prestressed thick reinforcement with connector;
Five, installation code section (2): prestressed thick reinforcement (5) is penetrated preformed hole (4) in standard paragraphs (2) annular wall, the nested cooperation of installation step on the installation step of standard paragraphs (2) lower end and the changeover portion (1);
Six, repeat " step 4 and five ", until installing all standard paragraphs;
Seven, pier top section (3) is installed: prestressed thick reinforcement (5) penetrates the preformed hole (4) in the pier top section (3), the installation step of section (3) lower end, pier top and nested cooperation of installation step of standard paragraphs (2) upper end;
Eight, stretch-draw prestressing force bar reinforcement and locate anchoring at stretch-draw anchor construction groove (10);
Nine, mud jacking;
Ten, locate fluid concrete at the prestressed stretch-draw anchor construction groove (10) of pier top section (3) upper end, close and protect is carried out in the anchoring termination of prestressed thick reinforcement (5).
2. precast assembly process of prestressed concrete cylindrical hollow pier according to claim 1 is characterized in that: described standard paragraphs (2) has multiple length selective, can be used in combination as required in the use.
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| CN 201010195412 CN101831875A (en) | 2010-06-09 | 2010-06-09 | Precast assembly process of prestressed concrete cylindrical hollow pier |
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Open date: 20100915 |