CN111519814A - Large-span double-slope roof prestressed reinforcement bundle straining beam construction method - Google Patents
Large-span double-slope roof prestressed reinforcement bundle straining beam construction method Download PDFInfo
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- CN111519814A CN111519814A CN202010412616.5A CN202010412616A CN111519814A CN 111519814 A CN111519814 A CN 111519814A CN 202010412616 A CN202010412616 A CN 202010412616A CN 111519814 A CN111519814 A CN 111519814A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B7/00—Roofs; Roof construction with regard to insulation
- E04B7/02—Roofs; Roof construction with regard to insulation with plane sloping surfaces, e.g. saddle roofs
- E04B7/022—Roofs; Roof construction with regard to insulation with plane sloping surfaces, e.g. saddle roofs consisting of a plurality of parallel similar trusses or portal frames
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
- E04G21/121—Construction of stressing jacks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
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- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a construction method of a large-span double-slope roof prestressed reinforcement bundle straining beam, which comprises the following steps: blanking prestressed reinforcement → installing reinforcing steel of the anchoring section of the prestressed reinforcement bundle → paving reinforcing steel → tensioning the prestressed reinforcement bundle and monitoring stress → installing suspension column reinforcing steel → wrapping the prestressed reinforcement bundle with epoxy corrugated cloth → pouring and maintaining concrete. The large-span double-slope roof structure design adopts a combined structure of the folding beam and the tension beam, and the tension beam provided with the prestressed reinforcement bundles resists the horizontal thrust of the folding beam, so that the large-span double-slope roof structure is economical and reasonable. And after the prestressed steel bundles of the straining beam are tensioned, concrete and hanging column concrete are coated outside the straining beam section and poured. The invention does not use anchorage tensioning, and the construction operation is convenient; a DH3819 wireless static test system is adopted for stress monitoring in the tensioning process of the prestressed reinforcement bundle, test data are visual, and prestress establishment is accurate.
Description
Technical Field
The invention particularly relates to a construction method of a large-span double-slope roof prestressed reinforcement bundle straining beam.
Background
The double-slope roof structure is a covering structure covering the top of a building house, can be transported to a building site for installation after being prefabricated in a factory, can also be poured on a building construction site, and then is lifted to the roof of the building house for installation. The former has good construction conditions, and has more perfect equipment for construction in factories. The latter has better matching degree, but has poorer construction conditions, and lacks of sufficiently fine equipment for construction.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the defects of the prior art, the invention provides a construction process of a large-span double-slope roof prestressed reinforcement bundle tie beam.
The technical scheme is as follows: a construction method for a large-span double-slope roof prestressed reinforcement bundle straining beam is characterized by comprising the following steps: the method comprises the following steps: prestressed reinforcement blanking → prestressed reinforcement bundle anchoring section reinforcement installation → reinforcement laying → tensioning → prestressed reinforcement bundle tensioning and stress monitoring → suspension column reinforcement installation → prestressed reinforcement bundle outsourcing epoxy corrugated cloth → concrete pouring and maintenance; wherein:
and (3) tensioning the prestressed reinforcement bundles and monitoring stress: under the assistance of a chain block, a straight thread positive and negative thread is fastened to center and stretch the prestressed reinforcement bundle;
the prestressed reinforcement bundle adopts a DH3819 wireless static test system to monitor the stress and strain of the reinforcement, and the monitoring system mainly comprises a sensor part (strain gauge), a wireless static strain collector, a wireless communication strain controller and the like;
before the prestressed reinforcement bundle starts to be tensioned, polishing ribs of the prestressed threaded reinforcement, and attaching a strain gauge 4m away from a tensioning end joint; connecting the strain gauge with a wireless static strain collector, and connecting a wireless communication strain controller with a computer provided with a DH3819 wireless static test system through a USB interface;
using a chain block to center the prestressed reinforcement bundle, recording an initial strain reading at the moment, tensioning the prestressed reinforcement bundle, simultaneously fastening a tensioning end joint by using a positive and negative wire straight thread sleeve, observing whether an exposed screw head of the positive and negative wire straight thread joint exceeds two threads or not when the monitoring strain reading-the initial strain reading is not less than 20 mu, namely the calculated stress is not less than 20MPa during tensioning, if so, continuously tensioning the prestressed reinforcement bundle until the exposed screw head is not more than two threads, simultaneously controlling the monitoring calculated stress of the reinforcement to be not more than 30MPa, completing tensioning, and timely recording the strain reading and the tensioning construction record when the tensioning is completed.
Further, the blanking of the prestressed reinforcement: when the tensile stress of the prestressed reinforcement bundle reaches 20MPa, the elongation of the prestressed reinforcement bundle is 2.68 mm; when the tensile stress of the prestressed reinforcement bundle reaches 30MPa, the elongation of the prestressed reinforcement bundle is 4.00 mm; and the lengths of two straight sections at the tensioning position of the prestressed reinforcement bundle are deducted by 5mm respectively so as to ensure the connection specification of the straight thread sleeve.
Further, the installation of the prestressed reinforcement bundle anchoring section steel bars: positioning the prestressed reinforcement bundle anchoring section steel bars according to the size of a construction drawing during installation, and fixing the prestressed reinforcement bundle anchoring section steel bars with the column steel bars through electric welding by using a short steel bar frame; the straight thread sleeve joint part is effectively fixed by adopting a perforated template; the construction joint is reserved at the joint of the roof folding beam and the prestressed reinforcement bundle draw beam.
Further, the steel bar laying: installing prestressed steel bundles after the prestressed steel bundle straining beam bottom plate is paved, wherein the installation is performed from two ends to the middle at the same time, and whether the working length meets the requirement or not is checked after the installation; in the laying construction, the construction is carried out according to a design drawing, and the position is determined by marking on the prestressed reinforcement bundle straining beam bottom die.
Further, the tensioning: the prestressed reinforcement bundles adopt a symmetrical tensioning sequence, and the section of the member is tensioned from bottom to top in principle.
Further, the suspension post rib is installed: when the roof is partially constructed, the longitudinal bars of the suspension post are reserved in advance, concrete is poured together with the steel bar bundle outer-covering structure, and the main bars of the suspension post
Hook the lower part at the root
And (7) reinforcing steel bars.
Further, the prestressed reinforcement bundle is wrapped with epoxy corrugated cloth: after the construction of the prestressed reinforcement bundles is completed, the reinforcement bundles are tightly wrapped by epoxy corrugated cloth, and the epoxy corrugated cloth is firmly bound by iron wires at intervals of 1 m.
Further, the concrete pouring and curing: a small concrete delivery pump is adopted for pouring, the concrete is compacted by an inserted vibrator, and the vibrator cannot impact a reinforcing steel bar and a template in the concrete vibrating process; the joint part of the straight thread sleeve is a key part and is compacted by vibration of a vibrating rod with the small diameter phi 30.
Has the advantages that: the large-span double-slope roof structure design adopts a combined structure of the folding beam and the tension beam, and the tension beam provided with the prestressed reinforcement bundles resists the horizontal thrust of the folding beam, so that the large-span double-slope roof structure is economical and reasonable. And after the prestressed steel bundles of the straining beam are tensioned, concrete and hanging column concrete are coated outside the straining beam section and poured. Compared with the common prestressed concrete member, the prestressed concrete member does not need to be tensioned by an anchorage device, and is convenient to construct and operate; a DH3819 wireless static test system is adopted for stress monitoring in the tensioning process of the prestressed reinforcement bundle, test data are visual, and prestress establishment is accurate.
Drawings
FIG. 1 is a schematic view of the WKL6 lower prestressed reinforcement tie beam of the present invention;
FIG. 2 is a schematic view of the WKL7 lower prestressed reinforcement tie beam of the present invention;
FIG. 3 is a schematic cross-sectional view of the present invention;
FIG. 4 is a schematic view of the process of construction of prestressed reinforcement bundles according to the present invention;
FIG. 5 is a schematic view of the present invention showing the fixation of the tendons to the joint area;
fig. 6 is a schematic view of a prestressed reinforcement bundle tensioning sequence according to the present invention;
fig. 7 is a schematic view of the centering and tensioning of the prestressed reinforcement bundles according to the present invention;
FIG. 8 is a schematic view of the strain gage mounting location of the present invention;
FIG. 9 is a schematic view of the connection between the strain gauge of the present invention and a wireless static strain collector;
FIG. 10 is a schematic view of a straight threaded box connection of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art without inventive faculty based on the embodiments described herein are intended to fall within the scope of the present invention.
Examples
The comprehensive building of the embodiment comprises a gymnasium and a report hall, wherein the gymnasium and the report hall are arranged on roofs WKL6 and WKL7, the span of the beams is 27 meters, prestressed reinforcement bundle draw beams are arranged below the gymnasium and the report hall as shown in figures 1-3, and a reinforcement section characteristic table of the prestressed reinforcement bundle draw beams is detailed in a table 1.
TABLE 1 prestressed reinforcement bundle straining beam reinforcement section characteristic table
Prestressed reinforcement bundle straining beam is adopted
The screw steel bar has the concrete strength grade of C30. The design requires that roof concrete is poured after the roof beam, the roof plate reinforcing steel bars and the prestressed reinforcement bundles are bound, the prestressed reinforcement bundles are tensioned after the strength of the concrete reaches 100% of the design strength, the stress of the prestressed reinforcement bundles is controlled to be 20 MPa-30 MPa, and the concrete wrapped outside the prestressed reinforcement bundles and the hanging column concrete are poured after the roof beam plate template and the support are disassembled. The prestressed reinforcement bundle is connected by adopting a straight thread sleeve, and the middle tensioning end is connected by adopting a positive and negative thread sleeve.
The main construction method of the prestressed reinforcement beam straining beam is as follows, wherein the flow of the prestressed reinforcement beam construction method is shown in fig. 4.
1 blanking of prestressed reinforcement
When the tensile stress of the prestressed reinforcement bundle reaches 20MPa, the elongation of the prestressed reinforcement bundle
△L＝·L/Eg＝20×26.818×103/(2×105)＝2.68mm
When the tensile stress of the prestressed reinforcement bundle reaches 30MPa, the elongation of the prestressed reinforcement bundle
△L＝·L/Eg＝30×26.818×103/(2×105)＝4.00mm
According to actual site construction experience, the lengths of two straight sections at the tensioning position of the prestressed reinforcement bundle are deducted by 5mm respectively so as to ensure the connection specification of the straight thread sleeve.
2 installation of prestressed reinforcement bundle anchoring section steel bars
And when the prestressed reinforcement bundle anchoring section steel bars are installed, the prestressed reinforcement bundle anchoring section steel bars are positioned according to the size of a construction drawing, and are fixed with the column steel bars in an electric welding mode through the short steel bar frame stand, so that the prestressed reinforcement bundle anchoring section steel bars are ensured to be perpendicular to the frame column steel bars. The straight thread sleeve joint part is effectively fixed by adopting a perforated template, see figure 5, so that the deviation of the prestressed reinforcement bundles caused by the vibration of the roof pouring concrete is prevented. The construction joint is reserved at the joint of the roof folding beam and the prestressed reinforcement bundle draw beam.
3 laying of steel bars
And mounting the prestressed reinforcement bundles after the prestressed reinforcement bundle straining beam bottom plate is paved. Installation should be done simultaneously from both ends towards the middle. After the installation, whether the working length meets the requirements or not should be checked for adjustment and replacement.
In the laying construction, construction personnel are required to carry out construction strictly according to design drawings, the positions of the prestressed reinforcement bundle straining beam bottom dies are determined by marking, the position deviation of the reinforcements is effectively solved, the horizontal deviation of the reinforcements meets the requirements, and the mutual penetration and distortion of the reinforcements in two directions are avoided.
4 tensioning
The prestressed reinforcement bundles adopt a symmetrical tensioning sequence, and the section of the member is tensioned from bottom to top in principle. As shown in fig. 6, the tendons were tensioned from No. 1 to No. 12 in this order.
5 prestressed reinforcement bundle tensioning and stress monitoring
In consideration of the limitation of a construction site and the danger of high-altitude operation, the centering and tensioning of the prestressed reinforcement bundles are carried out by adopting the straight thread positive and negative wire fastening under the assistance of the chain block, and the figure 7 is shown. Compared with other tools, the chain block has the following advantages: 1. the volume is small, the weight is light, and the carrying is convenient; 2. the hand pulling force is small, and the operation is safe; 3. no power supply is required.
And the prestress steel bar bundle is subjected to steel bar stress strain monitoring by a third-party detection unit by adopting a DH3819 wireless static test system. The monitoring system mainly comprises a sensor part (strain gauge), a wireless static strain collector, a wireless communication strain controller and the like.
Before the prestressed reinforcement bundle starts to be tensioned, the ribs of the prestressed threaded reinforcement are polished smooth, and the strain gauge is attached to the position 4m away from the tensioning end joint, as shown in figure 8. The strain gauge is connected with the wireless static strain collector in a connection mode shown in figure 9, and the wireless communication strain controller is connected with a computer provided with a DH3819 wireless static test system through a USB interface.
Using a chain block to perform prestressed reinforcement bundle centering, recording an initial strain reading at the moment, tensioning the prestressed reinforcement bundle, simultaneously fastening a tensioning end joint by using a positive and negative wire straight thread sleeve, and referring to a connection schematic diagram of the positive and negative wire straight thread sleeve of fig. 10 until the monitoring strain reading-the initial strain reading is more than or equal to 20 mu, namely the calculated stress is more than or equal to 20MPa (the elastic modulus of the steel bar is 2 × 10) during tensioning5MPa), observing whether the exposed screw head of the positive and negative screw thread straight thread joint exceeds two threads. If the stress exceeds two threads, the prestressed reinforcement bundle is continuously tensioned until the exposed screw threads are not larger than two threads, and meanwhile, the stress is controlled to be monitored and calculated to be not larger than 30MPa, and tensioning is finished. And timely recording strain reading and tension construction record when tension is finished.
6 hanging column rib installation
When the roof part is constructed, the suspension post longitudinal ribs are reserved in advance, and concrete is poured together with the steel bar bundle outer-covering structure. Main reinforcement of suspension post
Hook the lower part at the root
And (7) reinforcing steel bars.
7 prestressed reinforcement bundle externally-wrapped epoxy corrugated cloth
After the construction of the prestressed steel bar bundles is completed, the steel bar bundles are wrapped and compacted by epoxy corrugated cloth. The distance between the epoxy corrugated cloth is firmly bound by iron wires every 1 m, so that the epoxy corrugated cloth does not play a due role in the pouring and vibrating processes of the outer wrapping concrete.
8 concrete pouring and curing
Because the prestressed reinforcement beam concrete is constructed after the roof concrete is poured, the pump truck cannot be used for pouring the reinforcement beam concrete, and a small concrete delivery pump is adopted for pouring on site.
The concrete is compacted by using an inserted vibrator. In the concrete vibrating process, special attention should be paid to the fact that the vibrator cannot impact the reinforcing steel bars and the formwork so as to avoid slurry leakage or reinforcing steel bar displacement. The straight thread sleeve joint part is the key part, because the reinforcing bar is intensive, the pouring is smash difficult, should use minor diameter (phi 30) vibrting spear to vibrate closely to cause this position concrete to vibrate unreasonably and appear quality defects such as honeycomb, pitted surface.
The concrete should be maintained to prevent the concrete from generating temperature shrinkage cracks.
The construction of the prestressed reinforcement bundle in the invention is characterized by comprising the following steps:
1 blanking, stacking and transferring of reinforcing steel bars
According to the condition of the prestressed reinforcement bundle straining beam and the construction site, the reinforcement adopts on-site blanking. The blanking is performed with paying-off and cutting according to the blanking length and the blanking mode required in the construction process, and the elongation value of the tension section of the prestressed reinforcement bundle and the error value caused by the straight thread sleeve need to be noticed so as to ensure the accuracy of the blanking length of the reinforcement. The finished steel bars with the fed materials cannot be abraded.
And (5) sticking length labels on the fed steel bars, stacking the steel bars according to length classification, and hanging length labels. The reinforcing steel bar stacking site is close to the structure and the tower crane as far as possible, so that the transportation is facilitated.
2 double control of prestressed reinforcement beam tensioning process "
In the process of tensioning the prestressed reinforcement bundle, the stress of the reinforcement bundle is controlled to be between 20MPa and 30MPa, the exposed screw threads on two sides of the middle positive and negative thread straight thread sleeve are controlled not to exceed two screw threads, the thread heads of the reinforcement are pressed against each other at the central position of the sleeve, and no gap exists between the reinforcement and the connecting sleeve.
3 roof beam column node treatment
Because four rows of prestressed steel bundles are arranged at the nodes of the roof beam and the roof column, and the roof beam and the roof column steel bars and the embedded pipelines are added, the node structure is very complex, and the construction is difficult and key in the project. During construction, the relation among all construction processes is coordinated, and roof girder waist bars, two rows of steel bars, embedded pipelines and the like meet the anchoring requirement of the prestressed steel bar bundles as much as possible.
Concrete pouring at the node of the beam column is also the key point of construction, and the dense steel bars at the node require that the concrete must be poured compactly, and also protect the reinforcing steel bar bundles from shifting due to the impact of the vibrating bar, so that the bar falling position is properly reserved for the vibrating bar when the bar is tied.
4 installation and removal of formworks and supports
The roof beam side die can be installed after the prestressed reinforcement bundles are laid. If the roof beam side mold is installed before the prestressed reinforcement bundles are laid, the steel bars at the anchoring section of the prestressed reinforcement bundles cannot be effectively fixed, and the steel bars at the anchoring section are displaced when concrete is poured. The installation of the frame beam side die after the prestressed steel bar bundles are laid, adjusted and positioned is guaranteed, and the method is very important for guaranteeing the quality and the working efficiency of steel bar burying.
The prestressed reinforcement bundle anchoring section is a place with the largest stress in the whole member prestress application process, and a template at the place needs to be tightly blocked, so that local slurry leakage at the position in the concrete pouring process is prevented, and local cracks with overlarge concentrated stress in the tensioning process are prevented. In order to ensure the blocking quality of the prestressed reinforcement bundle anchoring section template, the template can be blocked by splicing small templates.
In conclusion, the construction of the prestressed reinforcement bundle of the present invention has not only the commonness of the ordinary reinforced concrete structure but also its own characteristics. In the construction process, the quality is required to be improved from each project link of the steel bar, the template and the concrete, so that the superiority of the prestressed reinforcement bundle is fully exerted.
Claims (8)
1. A construction method for a large-span double-slope roof prestressed reinforcement bundle straining beam is characterized by comprising the following steps: the method comprises the following steps: prestressed reinforcement blanking → prestressed reinforcement bundle anchoring section reinforcement installation → reinforcement laying → tensioning → prestressed reinforcement bundle tensioning and stress monitoring → suspension column reinforcement installation → prestressed reinforcement bundle outsourcing epoxy corrugated cloth → concrete pouring and maintenance; wherein:
and (3) tensioning the prestressed reinforcement bundles and monitoring stress: under the assistance of a chain block, a straight thread positive and negative thread is fastened to center and stretch the prestressed reinforcement bundle;
the prestressed reinforcement bundle adopts a DH3819 wireless static test system to monitor the stress and strain of the reinforcement, and the monitoring system mainly comprises a sensor part (strain gauge), a wireless static strain collector, a wireless communication strain controller and the like;
before the prestressed reinforcement bundle starts to be tensioned, polishing ribs of the prestressed threaded reinforcement, and attaching a strain gauge 4m away from a tensioning end joint; connecting the strain gauge with a wireless static strain collector, and connecting a wireless communication strain controller with a computer provided with a DH3819 wireless static test system through a USB interface;
using a chain block to center the prestressed reinforcement bundle, recording an initial strain reading at the moment, tensioning the prestressed reinforcement bundle, simultaneously fastening a tensioning end joint by using a positive and negative wire straight thread sleeve, observing whether an exposed screw head of the positive and negative wire straight thread joint exceeds two threads or not when the monitoring strain reading-the initial strain reading is not less than 20 mu, namely the calculated stress is not less than 20MPa during tensioning, if so, continuously tensioning the prestressed reinforcement bundle until the exposed screw head is not more than two threads, simultaneously controlling the monitoring calculated stress of the reinforcement to be not more than 30MPa, completing tensioning, and timely recording the strain reading and the tensioning construction record when the tensioning is completed.
2. The construction method of the large-span double-slope roof prestressed reinforcement tie beam according to claim 1, characterized in that: blanking the prestressed reinforcement: when the tensile stress of the prestressed reinforcement bundle reaches 20MPa, the elongation of the prestressed reinforcement bundle is 2.68 mm; when the tensile stress of the prestressed reinforcement bundle reaches 30MPa, the elongation of the prestressed reinforcement bundle is 4.00 mm; and the lengths of two straight sections at the tensioning position of the prestressed reinforcement bundle are deducted by 5mm respectively so as to ensure the connection specification of the straight thread sleeve.
3. The construction method of the large-span double-slope roof prestressed reinforcement tie beam according to claim 1, characterized in that: and (3) installing the steel bars of the prestressed steel bar bundle anchoring section: positioning the prestressed reinforcement bundle anchoring section steel bars according to the size of a construction drawing during installation, and fixing the prestressed reinforcement bundle anchoring section steel bars with the column steel bars through electric welding by using a short steel bar frame; the straight thread sleeve joint part is effectively fixed by adopting a perforated template; the construction joint is reserved at the joint of the roof folding beam and the prestressed reinforcement bundle draw beam.
4. The construction method of the large-span double-slope roof prestressed reinforcement tie beam according to claim 1, characterized in that: and (3) laying steel bars: installing prestressed steel bundles after the prestressed steel bundle straining beam bottom plate is paved, wherein the installation is performed from two ends to the middle at the same time, and whether the working length meets the requirement or not is checked after the installation; in the laying construction, the construction is carried out according to a design drawing, and the position is determined by marking on the prestressed reinforcement bundle straining beam bottom die.
5. The construction method of the large-span double-slope roof prestressed reinforcement tie beam according to claim 1, characterized in that: tensioning: the prestressed reinforcement bundles adopt a symmetrical tensioning sequence, and the section of the member is tensioned from bottom to top in principle.
6. The construction method of the large-span double-slope roof prestressed reinforcement tie beam according to claim 1, characterized in that: the hanging column rib is installed: when the roof is partially constructed, the longitudinal bars of the suspension post are reserved in advance, concrete is poured together with the steel bar bundle outer-covering structure, and the main bars of the suspension post
Hook the lower part at the root
And (7) reinforcing steel bars.
7. The construction method of the large-span double-slope roof prestressed reinforcement tie beam according to claim 1, characterized in that: and the prestressed reinforcement bundles are wrapped with epoxy corrugated cloth: after the construction of the prestressed reinforcement bundles is completed, the reinforcement bundles are tightly wrapped by epoxy corrugated cloth, and the epoxy corrugated cloth is firmly bound by iron wires at intervals of 1 m.
8. The construction method of the large-span double-slope roof prestressed reinforcement tie beam according to claim 1, characterized in that: pouring and maintaining the concrete: a small concrete delivery pump is adopted for pouring, the concrete is compacted by an inserted vibrator, and the vibrator cannot impact a reinforcing steel bar and a template in the concrete vibrating process; the joint part of the straight thread sleeve is a key part and is compacted by vibration of a vibrating rod with the small diameter phi 30.
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| CN202010412616.5A CN111519814A (en) | 2020-05-15 | 2020-05-15 | Large-span double-slope roof prestressed reinforcement bundle straining beam construction method |
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| CN202010412616.5A CN111519814A (en) | 2020-05-15 | 2020-05-15 | Large-span double-slope roof prestressed reinforcement bundle straining beam construction method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101029519A (en) * | 2007-03-23 | 2007-09-05 | 北京城建集团有限责任公司 | Method for installing large-span two-way prestressed cable |
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| CN106522561B (en) * | 2016-11-02 | 2018-12-14 | 中建八局第三建设有限公司 | Stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip |
| CN109440929A (en) * | 2018-11-13 | 2019-03-08 | 贵州建工集团第六建筑工程有限责任公司 | A kind of prefabricated traction construction method of installation of roof system stressed arch-bar high-altitude tensioning |
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2020
- 2020-05-15 CN CN202010412616.5A patent/CN111519814A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101029519A (en) * | 2007-03-23 | 2007-09-05 | 北京城建集团有限责任公司 | Method for installing large-span two-way prestressed cable |
| KR20110070424A (en) * | 2009-12-18 | 2011-06-24 | 재단법인 포항산업과학연구원 | Steel roof system having tensioning apparatus |
| CN106522561B (en) * | 2016-11-02 | 2018-12-14 | 中建八局第三建设有限公司 | Stretch-draw construction method in large-span concrete Vierendeel girder bonded prestress post-cast strip |
| CN109440929A (en) * | 2018-11-13 | 2019-03-08 | 贵州建工集团第六建筑工程有限责任公司 | A kind of prefabricated traction construction method of installation of roof system stressed arch-bar high-altitude tensioning |
Non-Patent Citations (1)
| Title |
|---|
| 徐剑、祝伟、陈欢: "大跨度双坡式屋面预应力钢筋束拉梁施工技术", 《建筑学研究前沿》 * |
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Application publication date: 20200811 |
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