CN101324086A - Construction method of large-span box variable cross-section reinforcement concrete arch - Google Patents

Construction method of large-span box variable cross-section reinforcement concrete arch Download PDF

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Publication number
CN101324086A
CN101324086A CNA2008103031909A CN200810303190A CN101324086A CN 101324086 A CN101324086 A CN 101324086A CN A2008103031909 A CNA2008103031909 A CN A2008103031909A CN 200810303190 A CN200810303190 A CN 200810303190A CN 101324086 A CN101324086 A CN 101324086A
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China
Prior art keywords
arch
donor
concrete
construction method
variable cross
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Pending
Application number
CNA2008103031909A
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Chinese (zh)
Inventor
施锦飞
张公义
倪金华
单采杰
杨发兵
谭文成
闵学军
曾纪根
陈小茹
罗琼英
李慧
钟燕
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China Construction Second Engineering Bureau Co Ltd
Third Construction Engineering Co Ltd of China Construction Second Engineering Bureau Co Ltd
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China Construction Second Engineering Bureau Co Ltd
Third Construction Engineering Co Ltd of China Construction Second Engineering Bureau Co Ltd
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Priority to CNA2008103031909A priority Critical patent/CN101324086A/en
Publication of CN101324086A publication Critical patent/CN101324086A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a large-span box-shaped variable-section reinforced concrete arch construction method, comprising the steps as follows: after the foundation construction is completed, an arch springing bearing platform is formed by concrete pouring on the foundation; subsequently, an arch body supporting frame foundation construction is carried out; on the foundation of the arch body supporting frame, the arch body supporting frames are symmetrically arranged between two arch springings; on the arch body supporting frame, arch body external formwork bottom plates are symmetrically arranged from two ends of the arch springings to the center of the arch body at the same time; the bottom reinforcement of the arch body is binded on the upper surface of the external formwork bottom plate; subsequently, the arch body formworks are installed; the concrete is poured by sections from the two ends to the middle of the arch simultaneously; finally, the concrete used for sealing the arch is poured; when the formworks are removed, the formworks are removed symmetrically from the center to the two ends of the arch springing simultaneously; finally, the concrete curing of the arch body is carried out. The construction method of the invention solves the construction technical problem of large-span reinforced concrete hollow variable-section arch.

Description

Construction method of large-span box variable cross-section reinforcement concrete arch
(1) technical field
The present invention relates to a kind of job practices of reinforced concrete arch.
(2) background technology
The arch non-uniform beam structure of large span is mainly used in bridge construction in the actual engineering; It almost is blank that the arch non-uniform beam structure of large span is used in sports palace building, the large-scale conference and exhibition center public building, if and domes are arranged in the traditional architecture, generally all adopt steel work, main cause is that large-span steel-reinforced concrete arch difficulty of construction is too big, the construction cost height, requirement quality height, but for some arch public buildings that specific (special) requirements arranged such as the outer natural effect that requires to occur clear-water concrete etc., the reinforced concrete structure of so just having to adopt decorated.The concrete construction technology and the domestic rawness still of work progress of the hollow variable cross-section arch of large span can be used for reference.
(3) summary of the invention
The purpose of this invention is to provide a kind of construction method of large-span box variable cross-section reinforcement concrete arch, solve the technical problem of large span hollow steel bar concrete arch construction.
For achieving the above object, the present invention adopts following technical scheme:
A kind of construction method of large-span box variable cross-section reinforcement concrete arch, its step is as follows:
Step 1, after foundation construction finished, cast arch springing cushion cap and arch springing carried out the foundation construction of donor bracing frame then on the basis;
Step 2 on the donor bracing frame basis, symmetry is set up the donor bracing frame between two arch springings, and is reinforced bridging in the donor bracing frame outside;
Step 3, on the donor bracing frame, simultaneously to the external baffle plate of the donor symmetrical mounting arch of central authorities, the secondary joist inner face is close in the mold bottom plate outside from the arch springing two ends, and the secondary joist outside is near the cross bar of donor bracing frame;
Step 4, on mold bottom plate, colligation donor bottom reinforcement bars, the bottom longitudinal reinforcement adopts the arc that matches with the donor radian;
Step 5, mounting arch phantom plate, it is in proper order: an arch heelpiece piece, baffle plate in the mounting arch, Eight characters template in the arch of installation internal mold side plate and corner is tied up donor side reinforcing bar, and mounting arch external mold side plate is installed internal mold top plate, ties up arch vault reinforcing bar, and the external mold top board is installed; Main joist is close to the external mold side plate outside and internal mold side plate inboard respectively, and secondary joist is close to the external mold top board outside and internal mold top plate inboard respectively, is close to the main joist external surface and establishes horizontal back cord, and be close to the perpendicular back cord of horizontal back cord arranged outside; Between the heel inside and outside the arch end, vault and the arch side, connect split bolt, connect flower hurdle bolt between the split bolt at two arch sidewall middle parts;
Step 6 to medial section fluid concrete simultaneously, is sealed the arch concrete pouring from the two ends of arch at last;
Step 7 is from donor mediad arch springing two ends symmetry stripping;
Step 8 is carried out the donor concrete curing.
Described large-span box variable cross-section reinforcement concrete arch is two or more, between two arches reinforced concrete truss is set, as the linking beam of two arches.
In the above-mentioned steps 1, the foundation construction of donor bracing frame is at first carried out original soil to the place and is rolled, then the back-up sand gravel, pouring concrete on sand gravel again, the concrete pouring maintenance finishes, and tests its intensity, and intensity is descended the step construction after reaching the foundation bearing capacity design load of donor bracing frame.
In the above-mentioned steps 2, the donor bracing frame comprises vertical rod and cross bar.
In the above-mentioned steps 3, between the external mold top board at donor middle part, leave portable plate, insert as concrete feed opening and vibrating head and smash the hole, when concrete casting so far during the piece template, this piece template of envelope nail.
In the above-mentioned steps 4, the donor bottom reinforcement bars is installed comb template die plate at the constuction joint place, apart from constuction joint 250mm place, the reinforcing bar posting is installed.
In the above-mentioned steps 5, arch external mold side plate is taked the formwork method of two side form bag bed dies, and under arch external mold side plate and arch mold bottom plate cross-stitch lumps of wood bar is set.
In the above-mentioned steps 5, whole donor middle position sidewall external mold side plate adopts the mold method of two-way pair of back cord, promptly is close to the main joist external surface and establishes two horizontal back cords, and be close to horizontal back cord arranged outside one perpendicular back cord.
In the above-mentioned steps 6, be drilled with steam vent at the middle part of interior baffle plate, treat the concrete casting via hole after, with stopper that this steam vent is stifled tight.
In the above-mentioned steps 7, stripping is torn external mold top board and the external mold side plate of arch in the exterior sheathing earlier open, after tear the arch inner formword open, tear mold bottom plate at last open; When tearing the arch inner formword open, tear Eight characters template in the arch up and down earlier open, tear arch internal mold side plate then open, last internal mold top plate, require donor side and end face concrete strength 〉=2.4MPa during form removal, when removing inner formword, concrete strength 〉=10MPa, when removing mold bottom plate, concrete strength need reach donor structure design intensity.
Compared with prior art the present invention has following characteristics and beneficial effect:
The present invention is applied to the public building field with the large-span concrete arch structure, rational in infrastructure, weight reduction, solved the constructing technology problem of the hollow variable cross-section concrete arch of large span, not only reduced difficulty of construction, also reduced construction cost, improved workmanship, constructional materials can be reused by secondary.The steel concrete donor can reach the effect of clear-water concrete, need not plaster after the form removal, as finishing, only do simple cleaning after, i.e. the water white concrete protective liquid of section's spary.
The present invention goes for the construction of various camber lines, the hollow steel bar concrete arch of span above hundred meters, can be widely used in the construction in various public buildings, particularly large-scale gymnasium, exhibition hall.
(4) description of drawings
The present invention will be further described in detail below in conjunction with accompanying drawing.
Fig. 1 is an embodiment of the invention structural representation.
Fig. 2 is an embodiment of the invention stereogram.
Fig. 3 is that embodiment of the invention donor template is installed drawing in side sectional elevation.
Reference numeral: baffle plate, 5-internal mold top plate, 6-internal mold side plate, 7-internal mold Eight characters plate, 8-split bolt, 9-flower hurdle bolt, 10-reinforced concrete truss, 11-donor, the perpendicular back cord of 12-, the horizontal back cord of 13-, 14-vertical rod, 15-arch springing, 16-secondary joist, 17-main joist, 18-cross bar, 19-bridging, 20-basis, 21-arch springing cushion cap, 22-donor bracing frame basis, 23-lumps of wood bar in 1-mold bottom plate, 2-external mold top board, 3-external mold side plate, the 4-.
(5) specific embodiment
Embodiment is referring to Fig. 1～shown in Figure 3, and Fig. 1 is the present embodiment structural representation, and Fig. 2 is the present embodiment schematic perspective view, and referring to Fig. 1, Fig. 2, present embodiment is made up of two symmetrical donors, connects by truss between the donor.Donor is a box variable cross-section concrete structure.Referring to Fig. 3, for present embodiment donor template is installed drawing in side sectional elevation.The donor template is made up of mold bottom plate 1, external mold top board 2, external mold side plate 3, interior baffle plate 4, internal mold top plate 5, internal mold side plate 6, internal mold Eight characters plate 7.Be close to the donor side form and be provided with main joist, main joist is close to the external mold side plate outside and internal mold side plate inboard respectively; Be close to donor bed die and backform and be provided with secondary joist, secondary joist is close to the external mold top board outside and internal mold top plate inboard respectively; Be close to the main joist external surface and establish horizontal back cord, and be close to the perpendicular back cord of horizontal back cord arranged outside; Between the heel inside and outside the arch end, vault and the arch side, connect split bolt, connect flower hurdle bolt between the split bolt at two arch sidewall middle parts.
The concrete work progress of wall scroll arch is as follows in the present embodiment:
Step 1, after basis 20 constructions finished, cast arch springing cushion cap 21 and arch springing 15 on the basis carried out 22 constructions of donor bracing frame basis then; In the above-mentioned steps 1,22 constructions of donor bracing frame basis are at first carried out original soil to the place and are rolled, then the back-up sand gravel, pouring concrete on sand gravel again, the concrete pouring maintenance finishes, and tests its intensity, and intensity is descended the step construction after reaching the foundation bearing capacity design load of donor bracing frame 14.
Step 2 on the donor bracing frame basis 22, symmetry is set up the donor bracing frame between two arch springings, and is reinforced bridging 19 in the donor bracing frame outside; In the above-mentioned steps 2, the donor bracing frame all is φ 48 * 3.5 steel tube fastener scaffolds, and setting up width under every arch is 1.8m, vertical rod advance 1.2m, and array pitch is middle 0.8m, both sides 0.48m, and step pitch is 1.5m, and the donor bracing frame comprises vertical rod 14 and cross bar 18.
Step 3, on the donor bracing frame, simultaneously to the external baffle plate 1 of the donor symmetrical mounting arch of central authorities, secondary joist 16 inner faces are close in mold bottom plate 1 outside from the arch springing two ends, and secondary joist 16 outsides are near the cross bar 18 of donor bracing frame; In the above-mentioned steps 3, between the external mold top board 2 at donor middle part, leave portable plate, insert as concrete feed opening and vibrating head and smash the hole, when concrete casting so far during the piece template, this piece template of envelope nail.
Step 4, on mold bottom plate 1, colligation donor bottom reinforcement bars, the bottom longitudinal reinforcement adopts the arc that matches with donor 11 radians; In the above-mentioned steps 4, just prepare by construction section during the reinforcing bar blanking, longitudinal reinforcement is made into arc (matching with the donor radian) entirely.The whole cold extrusions of lengthways main steel bar joint.Outer stirrup is made into two " ∏ " fonts and adopts overlap welding, and joint staggers in adjacent stirrup, and the piece-ups of same section are no more than 50%; The tie wire head must not stretch to concrete surface, and reinforcing bar binding finishes, and the reinforcement cover cushion block must be tied; The donor bottom reinforcement bars is installed comb template die plate at the constuction joint place, apart from constuction joint 250mm place, the reinforcing bar posting is installed.
Step 5, mounting arch phantom plate, according to template schematic cross-sectional view mounting arch phantom plate shown in Figure 3, it is in proper order: an arch heelpiece piece, baffle plate 4 in the mounting arch, the interior Eight characters template 7 of arch of internal mold side plate 6 and corner is installed, tie up donor side reinforcing bar, mounting arch external mold side plate 3 is installed internal mold top plate 5, tie up arch vault reinforcing bar, external mold top board 2 is installed; Main joist is close to the external mold side plate outside and internal mold side plate inboard respectively, and secondary joist is close to the external mold top board outside and internal mold top plate inboard respectively, is close to the main joist external surface and establishes horizontal back cord, and be close to the perpendicular back cord of horizontal back cord arranged outside; Between the heel inside and outside the arch end, vault and the arch side, connect split bolt, connect flower hurdle bolt between the split bolts at two arch sidewalls middle parts, can adjust the clear distance of two side.In the above-mentioned steps 5, arch external mold side plate 3 is taked the formwork method of two side form bag bed dies, and under arch external mold side plate 3 and arch mold bottom plate 1 cross-stitch lumps of wood bar 23 is set.
Whole donor middle position sidewall external mold side plate 3 adopts the mold method of two-way pair of back cord, promptly is close to the main joist external surface and establishes two horizontal back cords 13, and be close to horizontal back cord 13 arranged outside one perpendicular back cord 12.All templates of arch all are prefabricated into semiproduct at the scene, transport to just assembling on the bracing frame, so both can improve the speed of formwork, also stereotype plate can be recycled, and reduce spillage of material.
When donor construction during to the middle part (arch axis line and horizontal angle are less than 30 °) of arch, can be outside the top without template, more convenient like this concrete casting and vibrating.
Step 6, donor concreting, its basic norm is still the principle of adhering to " symmetry ".Concreting branch group carries out synchronously for this reason.Donor construction flowing water section segmentation principle:
(1) the segmentation position should make donor support force symmetry, all even distortion is minimum;
(2) donor section construction seam should be considered truss and avoid the arch rib scope, makes things convenient for template to install and the dismounting of arch inner formword;
(3) joint face of each section must be vertical with the arch axis line;
(4) concreting order, necessary two arches from bottom to top, carry out synchronously simultaneously along axis direction segmentation symmetry.
Donor construction flowing water section is divided: be along the segmentation of arch axis direction, first constuction joint is at the arch springing place, and all the other constuction joints are arranged on the stiffening rib lower end of arch, and the most central one section (also being the highest one section) is envelope arch section, the about 2m of length.To medial section fluid concrete simultaneously, seal the arch concrete pouring from the two ends of arch at last.For preventing bubble so that honeycomb not to occur because of exhaust does not freely cause concrete surface in the concreting process, arrange the venthole (@1200mm of φ 16 in the drilled in middle one of inner bottom plating); In concreting process, allow concrete grout emerge from the hole, treat the concrete casting via hole, see when last hole emits cement paste, can be this steam vent is stifled tight with stopper.The envelope arch time will be selected in daily mean temperature and build near the time when average temperature of the whole year.
Step 7 is from donor mediad arch springing two ends symmetry stripping; In the above-mentioned steps 7, stripping is torn external mold top board 2 and the external mold side plate 3 of arch in the exterior sheathing earlier open, after tear the arch inner formword open, tear mold bottom plate 1 at last open; When tearing the arch inner formword open, tear Eight characters template 7 in the arch up and down earlier open, tear arch internal mold side plate 6 then open, last internal mold top plate 5, require donor side and end face concrete strength 〉=2.4MPa during form removal, when removing inner formword, concrete strength 〉=10MPa, when removing mold bottom plate 1, concrete strength need reach donor structure design intensity.
Step 8 is carried out the donor concrete curing.
Above-mentioned large-span box variable cross-section reinforcement concrete arch is two or more, between two arches reinforced concrete truss is set, as the linking beam of two arches.When two arches of construction, symmetry is carried out simultaneously.The construction of each truss structure is carried out to truss center symmetry simultaneously from truss and donor junction, and the construction of whole truss must the while symmetry be carried out from the arch springing truss to vault place truss.Be guaranteeing the resistance to overturning of supporting frame, remove bracing frame, establish vertically and outside the horizontal bridging by the 6m spacing, setting up laterally many row's steel pipe frames under by the truss projection in the middle of two arches, as the formwork-support of truss, also is the frame that links of donor bracing frame.
More than be exemplary embodiments of the present invention, enforcement of the present invention more than that.

Claims (10)

1. construction method of large-span box variable cross-section reinforcement concrete arch is characterized in that step is as follows:
Step 1, after basis (20) construction finished, cast arch springing cushion cap (21) and arch springing (15) on the basis carried out donor bracing frame basis (22) construction then;
Step 2 goes up on donor bracing frame basis (22), symmetry is set up the donor bracing frame between two arch springings, and reinforces bridging (19) in the donor bracing frame outside;
Step 3, on the donor bracing frame, simultaneously to the donor central authorities external baffle plate of symmetrical mounting arch (1), secondary joist (16) inner face is close in mold bottom plate (1) outside from the arch springing two ends, and secondary joist (16) outside is near the cross bar (18) of donor bracing frame;
Step 4, on mold bottom plate (1), colligation donor bottom reinforcement bars, the bottom longitudinal reinforcement adopts the arc that matches with donor (11) radian;
Top board (5) is tied up arch vault reinforcing bar, and external mold top board (2) is installed; Main joist (17) is close to external mold side plate (3) outside and internal mold side plate (6) inboard respectively, secondary joist (16) is close to external mold top board (2) outside and internal mold top plate (5) inboard respectively, be close to the main joist external surface and establish horizontal back cord (13), and be close to the perpendicular back cord (12) of horizontal back cord (13) arranged outside; Between the heel inside and outside the arch end, vault and the arch side, connect split bolt (8), connect flower hurdle bolt (9) between the split bolt at two arch sidewall middle parts;
Step 6 to medial section fluid concrete simultaneously, is sealed the arch concrete pouring from the two ends of arch at last;
Step 7 is from donor mediad arch springing two ends symmetry stripping;
Step 8 is carried out the donor concrete curing.
2. construction method of large-span box variable cross-section reinforcement concrete arch according to claim 1, it is characterized in that: described large-span box variable cross-section reinforcement concrete arch is two or more, between two arches, reinforced concrete truss is set, as the linking beam of two arches.
3. construction method of large-span box variable cross-section reinforcement concrete arch according to claim 1, it is characterized in that: in the above-mentioned steps 1, donor bracing frame basis (22) construction is at first carried out original soil to the place and is rolled, back-up sand gravel then, pouring concrete on sand gravel again, the concrete pouring maintenance finishes, and tests its intensity, and intensity is descended the step construction after reaching the foundation bearing capacity design load of donor bracing frame (14).
4. construction method of large-span box variable cross-section reinforcement concrete arch according to claim 1 is characterized in that: in the above-mentioned steps 2, the donor bracing frame comprises vertical rod (14) and cross bar (18).
5. construction method of large-span box variable cross-section reinforcement concrete arch according to claim 1, it is characterized in that: in the above-mentioned steps 3, between the external mold top board (2) at donor middle part, leave portable plate, as concrete feed opening and the slotting hole of smashing of vibrating head, when concrete casting so far during the piece template, this piece template of envelope nail.
6. construction method of large-span box variable cross-section reinforcement concrete arch according to claim 1 is characterized in that: in the above-mentioned steps 4, the donor bottom reinforcement bars is installed comb template die plate at the constuction joint place, apart from constuction joint 250mm place, the reinforcing bar posting is installed.
7. construction method of large-span box variable cross-section reinforcement concrete arch according to claim 1, it is characterized in that: in the above-mentioned steps 5, arch external mold side plate (3) is taked the formwork method of two side form bag bed dies, and under arch external mold side plate (3) and arch mold bottom plate (1) cross-stitch lumps of wood bar (23) is set.
8. construction method of large-span box variable cross-section reinforcement concrete arch according to claim 1, it is characterized in that: in the above-mentioned steps 5, whole donor middle position sidewall external mold side plate (3) adopts the mold method of two-way pair of back cord, promptly be close to the main joist external surface and establish two horizontal back cords (13), and be close to horizontal back cord (13) arranged outside one perpendicular back cord (12).
9. construction method of large-span box variable cross-section reinforcement concrete arch according to claim 1 is characterized in that: in the above-mentioned steps 6, be drilled with steam vent at the middle part of interior baffle plate, treat the concrete casting via hole after, with stopper that this steam vent is stifled tight.
10. construction method of large-span box variable cross-section reinforcement concrete arch according to claim 1, it is characterized in that: in the above-mentioned steps 7, stripping is torn external mold top board (2) and the external mold side plate (3) of arch in the exterior sheathing earlier open, after tear the arch inner formword open, tear mold bottom plate (1) at last open; When tearing the arch inner formword open, tear Eight characters template (7) in the arch up and down earlier open, tear arch internal mold side plate (6) then open, last internal mold top plate (5), require donor side and end face concrete strength 〉=2.4MPa during form removal, when removing inner formword, concrete strength 〉=10MPa, when removing mold bottom plate (1), concrete strength need reach donor structure design intensity.
CNA2008103031909A 2008-07-29 2008-07-29 Construction method of large-span box variable cross-section reinforcement concrete arch Pending CN101324086A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102409852A (en) * 2011-09-30 2012-04-11 中国二十二冶集团有限公司 Construction method for wood formwork with bigger circular structure by taking reinforcing steel bar as lateral rear edge
CN106906897A (en) * 2017-03-31 2017-06-30 安徽金鹏建设集团股份有限公司 A kind of construction method of skyscraper Liang Shi structural transition layers
CN109736449A (en) * 2019-01-11 2019-05-10 杭州江润科技有限公司 Stiffness structure bean column node and construction method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102409852A (en) * 2011-09-30 2012-04-11 中国二十二冶集团有限公司 Construction method for wood formwork with bigger circular structure by taking reinforcing steel bar as lateral rear edge
CN102409852B (en) * 2011-09-30 2013-10-23 中国二十二冶集团有限公司 Construction method for wood formwork with bigger circular structure by taking reinforcing steel bar as lateral rear edge
CN106906897A (en) * 2017-03-31 2017-06-30 安徽金鹏建设集团股份有限公司 A kind of construction method of skyscraper Liang Shi structural transition layers
CN109736449A (en) * 2019-01-11 2019-05-10 杭州江润科技有限公司 Stiffness structure bean column node and construction method

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Open date: 20081217