CN111910760A - Construction method of integral counterweight type pretensioning method prestress tensioning platform - Google Patents
Construction method of integral counterweight type pretensioning method prestress tensioning platform Download PDFInfo
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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
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
- B28B23/04—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members the elements being stressed
- B28B23/043—Wire anchoring or tensioning means for the reinforcements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0029—Moulds or moulding surfaces not covered by B28B7/0058 - B28B7/36 and B28B7/40 - B28B7/465, e.g. moulds assembled from several parts
- B28B7/0032—Moulding tables or similar mainly horizontal moulding surfaces
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/01—Flat foundations
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Abstract
The construction method of the prestressed tensioning table with the integral counterweight type pretensioning method is characterized by comprising the following steps of: a. b, pre-tensioning method prestress tensioning table base foundation construction, b, prestress tensioning table base front end tensioning steel structure construction, c, prestress tensioning table base front end tensioning steel structure construction, d, prestress tensioning table construction, e prestress tensioning table bottom film installation, and f, prestress table base and tensioning table construction acceptance check. The invention has the advantages of scientific and reasonable construction steps of the prestress tensioning platform, tight structure of each component, convenient manufacture, capability of ensuring that the phenomena of uneven settlement and deviation of prestress steel strands of the front-end tensioning part and the rear-end counterweight part are avoided, safer tensioning, better tensioning precision, easiness in local material obtaining of counterweight materials and reduction of engineering cost.
Description
Technical Field
The invention relates to a pretensioning method prestress tensioning table, in particular to a construction method of an integral counterweight type pretensioning method prestress tensioning table seat.
Background
At the present stage, governments in various places have certain requirements on building assembly rate, the development of the assembled structural building in China is actively promoted, and the pretensioning prestressed structural member is taken as an assembled member and has a very strong popularization prospect.
A common pretensioning prestressing pedestal is: pier type pedestal, slot type pedestal, steel die pedestal. The pier type pedestal is divided into a gravity type pedestal, a pile foundation framework type pedestal, a pedestal coaction type pedestal and a framework type pedestal. It is suitable for producing medium and small components, and has sufficient strength, rigidity and stability. Is not suitable for batch production of the ultra-long tensioning prestressed structure and the prestressed component.
The groove type pedestal can bear tension force and overturning moment and can be used as a steam maintenance groove after being covered. But the tensioning length of the groove type pedestal is 50-120 meters, so that the groove type pedestal is not suitable for mass production of prestressed components with the tensioning length of more than 150 meters.
The steel die bed seat is a bed seat which takes a template for manufacturing a component as a prestressed reinforcement anchoring support seat. The template has considerable rigidity, prestressed reinforcements can be placed on the template for tensioning, the template is mainly used on a factory production line, and the factory production line is difficult to have and has certain difficulty for a production line with the tensioning length of more than 200 meters.
Chinese patent CN201910061061.1A discloses a pretensioning prestressed pedestal construction method in 2019, 4.5.2019, wherein a groove type pedestal is adopted, the groove type pedestal comprises a gravity pier, a tensioning bracket, a pressure column, a tensioning beam and an anchoring beam, although the technical scheme solves unsafe factors existing in the design of the original pretensioning pedestal, the economic rationality of pedestal construction is ensured, the safety reliability and the economical efficiency of pretensioning pedestal construction are improved, the construction land is reduced, the construction efficiency is improved, the limitation of the groove type pedestal exists, large-scale components cannot be produced, large-scale and repeated production of prestressed components cannot be realized, and the length of the components cannot reach more than 250 meters.
The known benzene hydrogenation processes therefore suffer from the various inconveniences and problems described above.
Disclosure of Invention
The invention aims to provide a construction method of an ultra-long (150-250 m) integral counterweight type pretensioning method prestress tensioning platform.
Another objective of the present invention is to provide a construction method of an integral weight type pretensioning prestressed tensioning platform, which can produce the prefabricated members in a large scale, can produce the prefabricated members in a large scale repeatedly, and can improve the labor efficiency.
In order to achieve the purpose, the technical solution of the invention is as follows:
the construction method of the prestressed tensioning table with the integral counterweight type pretensioning method is characterized by comprising the following steps of:
a. pre-tensioning method prestress tensioning base foundation construction
The foundation of the prestress tensioning platform base is a reinforced concrete raft, the reinforcing steel bars of the raft are arranged in a double-layer bidirectional mode, and the reinforcing steel bars of the bottom plate of the raft are placed on the reinforcing steel bars at the bottom of the anchoring beam; the raft plate is provided with a cushion layer which is a concrete foundation cushion layer; the upper part of the foundation at the front end of the tensioning platform is provided with reinforcing steel bars, C40 concrete is poured after the reinforcing steel bars are installed, water is sprayed for maintenance, broken stones are backfilled in the middle of the foundation, a concrete terrace is poured on the upper part of the foundation, the anchoring beam is arranged at the middle bottom of the counterweight part of the raft foundation and longitudinally extends along the same direction as the raft foundation, the lower longitudinal stress reinforcing steel bars of the raft foundation are arranged on the upper parts of the lower reinforcing steel bars of the anchoring beam and are perpendicular to the lower reinforcing steel bars of the anchoring beam, the upper longitudinal reinforcing steel bars of the raft foundation penetrate through the inside of the anchoring beam and are perpendicular to the anchoring beam, the anchoring beam and the raft foundation are simultaneously poured with concrete, after the concrete is molded, the anchoring beam and the raft foundation are combined into a whole, and the anchoring beam and the raft foundation jointly bear the upward tension. Namely, the anchoring beam actually plays a role in anchoring finish rolling deformed steel bars or steel anchor cables and bears upward tension together with the raft foundation;
b. construction of tensioning steel structure at front end of prestress tensioning platform
The tension steel structure at the front end of the prestress tension table base is provided with a connecting steel beam, and the connecting steel beam and the steel anchor cable are connected with the counterweight part; a plurality of steel upright posts are anchored by high-strength bolts and connected with steel beams, and gaps between the steel upright posts and the foundation are filled with longitudinal steel bars of 5 three-level steels phi 8@100 and 17-C40 micro-expansion concrete; the steel upright post is anchored with the upper part of the tensioning front end foundation through a T-shaped connecting plate and an embedded anchor bolt;
c. construction of tensioning steel structure at front end of prestress tensioning platform
The steel beam of the tension steel structure at the front end of the prestress tension table base is a connecting beam, and the connecting beam is connected with the counterweight part by matching double-channel steel with a steel anchor cable; the steel upright posts are anchored by high-strength bolts and connected with steel beams, and gaps between the steel columns and the foundation are filled with longitudinal steel bars, 5 three-level steel phi 8@100 and 17-C40 micro-expansion concrete; the steel column is anchored with the upper part of the tensioning front end foundation through a T-shaped connecting plate and an embedded anchor bolt;
d. prestressed tensioning platform construction
The prestressed tensioning table cushion layer is a C15 concrete cushion layer, the cushion layer foundation steel bars are arranged in a double-layer bidirectional mode, the tie bars are tensioning table tie bars, the tie bars are provided with bidirectional draw hooks and arranged in a quincunx mode, and the tensioning table foundation concrete is 300-thick C50 concrete; after the tie bars are bound, reserving construction joints, pouring concrete according to the plane of the tensioning platform, watering, pouring and curing, pouring concrete of a tensioning and lifting post-pouring belt and the front end C50 of the pedestal, and watering and curing;
e installation of prestressed stretch-draw bench basement membrane
The bottom film of the channel steel of the prestress tensioning table is provided with a main beam and a secondary frame beam which are spliced reversely, and the bottom film of the channel steel is a secondary beam bottom film reversely; the primary beam, the secondary frame beam and the secondary beam bottom membrane are fixed by using angle steel as a beam position template bottom support and an angle steel template lower side support;
f. construction acceptance of prestressed pedestal and tensioning table
After the construction of the prestress pedestal and the tensioning platform is finished, the examination and acceptance are organized, and the settlement and deformation of the pedestal and the deformation of the tensioning platform are observed according to the standard and drawing requirements.
The construction method of the integral counterweight type pretensioning method prestress tensioning platform can be further realized by adopting the following technical measures.
The method of any preceding claim, wherein the reinforced concrete raft is a C40 reinforced concrete raft of 23-600 mm thickness.
In the above method, the material of the steel column is H800X350X14X 16.
The method, wherein the number of the steel columns for connecting the steel beams is determined according to the number of the tension lines.
By adopting the technical scheme, the construction method of the integral counterweight type pretensioning method prestress tensioning platform has the following advantages:
1. the construction steps of the prestress tensioning platform are scientific and reasonable, and each component has a tight structure and is convenient to manufacture;
2. the integral counterweight type pretensioning method prestress tensioning platform uniformly arranges the counterweight part of the tensioning pedestal and the tensioning end part at the front end of the pedestal on the same raft foundation, so that the uneven settlement of the front end tensioning part and the rear end counterweight part caused by two different foundation forms is avoided, the deformation of the front end steel structure part is avoided, and the phenomena of anchor release and deviation of prestress steel strands in the front end tensioning prestress process are avoided;
3. the tensioning is safer, the tensioning precision is better, the counterweight material is easy to be obtained from local materials, and the engineering cost is reduced;
4. the construction method of the prestress tensioning table is more suitable for geological conditions and can be constructed on the basis of geological conditions such as a weak subjacent layer.
Drawings
FIG. 1 is a schematic structural diagram of an integral counterweight pretensioned prestressing force tensioning pedestal according to an embodiment of the present invention;
FIG. 2 is a schematic view of a bottom mold assembly according to an embodiment of the present invention;
FIG. 3 is a schematic front elevation view of a counterweight frame according to an embodiment of the invention;
fig. 4 is a schematic view of a concrete construction sequence of the tensioning table according to the embodiment of the invention.
In the figure: 1-pedestal foundation part, 3-pedestal counterweight part, 4-pedestal front end tension steel structure part, 5-tension table part, 55-foundation raft plate double-layer bidirectional three-level steel phi 14@150, 56-200X200X16 steel plate anchoring end, 37-anchor rope beam lower part steel bar three-level steel 6 phi 20 and erection steel bar three-level steel 4 phi 16,57-50 thick C15 concrete foundation cushion layer, 23-600 mm thick C40 reinforced concrete raft plate, three-level steel 14@150, double-layer bidirectional, bottom plate steel bars are placed on beam bottom steel bars, 36-anchoring beam stirrup three-level steel 10@100, 35-anchor rope beam upper part steel bar three-level steel 6 phi 20, 7-finish rolling threaded steel anchoring, 8-25# b, 39-12-18 mm thick waste templates, 12-gravel filling, 9-16# b channel steel @400, 13-anchoring an anchor rope or a finish rolling screwed pipe into an anchoring beam, a 54-double 25# a channel steel fixed connecting beam, a 14-H800X350X14X16 connecting beam, a 15-M30 high-strength bolt for anchoring, a 16-H800X 350X14X16 tensioning steel upright post, 59-tensioning front end upper foundation C40 reinforced concrete stressed steel bar three-level steel 14@150, 20-M30 embedded tensioning steel post, an anchor bolt, a 22-100 thick C20 concrete terrace, 58-gravel tamping, 60-tensioning front end upper foundation C40 reinforced concrete distribution reinforced steel bar three-level steel 10@150, 17-grouting material sealing, 33-pedestal front end construction joint, 30-tensioning platform tie bar, three-level steel phi 8@400 bidirectional drag hook, quincunx arrangement, 34-tensioning platform C15 concrete 50 thick cushion layer, 61-tensioning platform reinforced steel bar two-level three-level steel bar phi 200, 62-tensioning platform 300 thick C50 concrete, 40-20# b channel steel bottom film, 41-L50X5 angle steel @ beam position template bottom support, 42-25# a channel steel bottom film, 43-L30X3 angle steel @ beam position template bottom support, 44-L50X5 angle steel template lower side support, 45-expansion bolts M16 bottom mold fixing bolts, 46-tensioning platform rear casting belt, 47-plane tensioning and lifting construction joint, 52-I area C50 concrete tensioning platform concrete pouring and 53-II area C50 concrete tensioning platform concrete pouring.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example 1
Referring to fig. 1, fig. 1 is a schematic structural diagram of an integral counterweight pretensioned prestressing tensioning pedestal according to an embodiment of the present invention.
The invention relates to a construction method of an integral counterweight type pretensioning method prestress tensioning platform, which comprises the following steps:
1. the foundation part 1 of the integral counterweight pre-tensioning method prestress tensioning base is constructed: the foundation is a C40 reinforced concrete raft with the thickness of 23-600 mm, and three-level steel 14@150, and is double-layer and bidirectional, and the bottom plate steel bars are placed on the bottom steel bars of the beam; the anchoring beam is 600X1200, 36-anchoring beam stirrup third-level steel 10@100, 35-anchor cable beam upper part reinforcing steel bar third-level steel 6 phi 20, 37-anchor cable beam lower part reinforcing steel bar third-level steel 6 phi 20mm and erection reinforcement third-level steel 4 phi 16; the cushion layer is a C15 concrete foundation cushion layer with the thickness of 57-50 mm; the method comprises the steps of firstly, stretching a platform to form a C40 reinforced concrete foundation with the thickness of 600mm on the upper portion of the front end of the stretching platform, stressed steel bars 59-C40 reinforced concrete stressed steel bar three-level steel 14@150 on the upper portion of the front end of the stretching platform, distributed steel bars 60-C40 reinforced concrete distributed steel bar three-level steel 10@150 on the upper portion of the front end of the stretching platform, pouring C40 concrete after the steel bars are installed, performing water spraying maintenance, backfilling 58-gravel tamping on the middle portion of the foundation, and pouring a C20 concrete terrace with the thickness of 22-100mm on the upper portion.
2. And (3) constructing a counterweight part 3 of the integral counterweight type pretensioning method prestress tensioning base: installing a counterweight fence on the foundation of the integral counterweight pre-tensioning method prestress tensioning pedestal, 7-lower-end fine thread steel anchoring, 8-lower-end 25# b channel steel, 9-16# b channel steel @400, 10-upper-end fine thread steel anchoring, 11-upper-end 25# b channel steel, after assembling a steel supporting frame, fixing a 39-12-18 mm thick waste template in the frame, and filling 12-broken stone in a combined enclosure. Fig. 3 is a schematic front elevation view of a counterweight frame according to an embodiment of the invention.
3. And (3) carrying out construction on a steel structure tensioning part 4 at the front end of the integral counterweight type pretensioning method prestress tensioning platform: the steel beam is a 14-H800X350X14X16 connecting beam, and is connected with the counterweight part by adopting 54-double 25# channel steel and 13-steel anchor cables; the steel upright is a 16-H800X 350X14X16 tension steel upright, and is connected with a steel beam by adopting 15-M30 high-strength bolt anchoring, and a gap between the steel column and a foundation is filled with 19-gap longitudinal steel bars, 5 three-level steel phi 8@100 and 17-C40 micro-expansion concrete; the steel column is anchored with the upper part of the base of the tensioning front end through a T-shaped connecting plate with the thickness of 50-20mm and an 18-M24 embedded anchor bolt; the number of the steel beams and the steel columns is determined according to the layout number of the tension lines, the project is 25 lines, and the distance between the steel beams and the steel columns is 400mm of the width of a main beam, 400mm of a secondary frame beam and 250mm of a secondary beam.
4. And (3) constructing an integral counterweight type pretensioning method prestress tensioning platform part 5: the cushion layer is a 34-tensioning platform C15 concrete 50 thick cushion layer; the basic steel bar is 61-tensioning table steel bar double-layer bidirectional three-level steel phi 10@200, the tie bar is 30-tensioning table tie bar, the three-level steel phi 8@400 bidirectional draw hook is arranged in a quincunx shape, and the basic concrete is 62-tensioning table 300-thick C50 concrete. After the steel bars are bound, reserving 47-construction joints according to a plan view, pouring 52-I area C50 concrete according to a plan view of a tensioning platform, sprinkling water, pouring and curing, pouring 46-tensioning and lifting post-pouring belt and pedestal front end C50 concrete 28 days later, and sprinkling water, curing and curing
5. Mounting a bottom film of a prestress tensioning table: the bottom films of 40-20# b channel steel are reversely spliced into the bottom films of the main beam and the secondary frame beam; the bottom film of the 42-25# a channel steel is a secondary beam bottom film in the reverse direction; the main beam, the secondary frame beam and the secondary beam bottom film are fixed through a 41-L50X5 angle steel @ beam position template bottom support, a 43-L30X3 angle steel @ beam position template bottom support and a 44-L50X5 angle steel template lower side support. Fig. 2 is a schematic view of installation of a bottom mold in the embodiment of the present invention, and fig. 4 is a schematic view of a concrete construction sequence of a tension table in the embodiment of the present invention.
6. After the construction of the prestress pedestal and the tensioning platform is finished, the examination and acceptance are organized, and the settlement and deformation of the pedestal and the deformation of the tensioning platform are observed according to the standard and drawing requirements.
The invention has substantive characteristics and obvious technical progress, the invention is a construction method of split counterweight type and integral counterweight type pretensioning method prestress tensioning table, the counterweight part of the pedestal is suitable for the raft foundation, the tensioning part at the front end adopts an independent foundation or an integral pile foundation to form the raft foundation, the counterweight part adopts channel steel, finish rolling screw steel, templates and other forms to combine and is installed on the counterweight foundation, masonry, sand or soil are filled in the counterweight foundation, the tensioning part at the front end adopts H-shaped steel to assemble and is connected with the counterweight part at the rear part through a steel cable or finish steel, the concrete part of the tensioning field adopts C50 high-strength concrete which is tightly connected with the front end of the pedestal, the resistance of the tensioning part at the front end of the pedestal is improved, the bottom die of the precast beam of the tensioning field adopts a channel steel reverse buckling form, and the forming effect and the damage resistance.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Accordingly, all equivalents are intended to fall within the scope of the invention, which is defined in the claims.
Claims (4)
1. The construction method of the prestressed tensioning table with the integral counterweight type pretensioning method is characterized by comprising the following steps of:
a. pre-tensioning method prestress tensioning base foundation construction
The foundation of the prestress tensioning platform base is a reinforced concrete raft, the reinforcing steel bars of the raft are arranged in a double-layer bidirectional mode, and the reinforcing steel bars of the bottom plate of the raft are placed on the reinforcing steel bars at the bottom of the anchoring beam; the raft plate is provided with a cushion layer which is a concrete foundation cushion layer; arranging steel bars in the upper part of the foundation at the front end of the tensioning platform, pouring C40 concrete after the installation of the steel bars, watering and curing, backfilling broken stones in the middle of the foundation, pouring a concrete terrace on the upper part, wherein the anchoring beam is arranged at the middle bottom of the counterweight part of the raft foundation and longitudinally extends along with the raft foundation, the longitudinal stress steel bar at the lower part of the raft foundation is arranged at the upper part of the steel bar at the lower part of the anchoring beam, and is vertical to the reinforcing steel bars at the lower part of the anchoring beam, the longitudinal reinforcing steel bars at the upper part of the raft foundation penetrate through the inside of the anchoring beam, the anchoring beam is vertical to the anchoring beam, concrete is poured on the anchoring beam and the raft foundation at the same time, after the concrete is formed, the anchoring beam and the raft foundation are combined into a whole, the anchoring beam and the raft foundation bear the upward tension of the upper anchoring finish rolling deformed steel or steel anchor cable together, namely, the anchoring beam actually plays a role in anchoring finish rolling deformed steel bars or steel anchor cables and bears upward tension together with the raft foundation;
b. construction of tensioning steel structure at front end of prestress tensioning platform
The tension steel structure at the front end of the prestress tension table base is provided with a connecting steel beam, and the connecting steel beam and the steel anchor cable are connected with the counterweight part; a plurality of steel upright posts are anchored by high-strength bolts and connected with steel beams, and gaps between the steel upright posts and the foundation are filled with longitudinal steel bars of 5 three-level steels phi 8@100 and 17-C40 micro-expansion concrete; the steel upright post is anchored with the upper part of the tensioning front end foundation through a T-shaped connecting plate and an embedded anchor bolt;
c. construction of tensioning steel structure at front end of prestress tensioning platform
The steel beam of the tension steel structure at the front end of the prestress tension table base is a connecting beam, and the connecting beam is connected with the counterweight part by matching double-channel steel with a steel anchor cable; the steel upright posts are anchored by high-strength bolts and connected with steel beams, and gaps between the steel columns and the foundation are filled with longitudinal steel bars, 5 three-level steel phi 8@100 and 17-C40 micro-expansion concrete; the steel column is anchored with the upper part of the tensioning front end foundation through a T-shaped connecting plate and an embedded anchor bolt;
d. prestressed tensioning platform construction
The prestressed tensioning table cushion layer is a C15 concrete cushion layer, the cushion layer foundation steel bars are arranged in a double-layer bidirectional mode, the tie bars are tensioning table tie bars, the tie bars are provided with bidirectional draw hooks and arranged in a quincunx mode, and the tensioning table foundation concrete is 300-thick C50 concrete; after the tie bars are bound, reserving construction joints, pouring concrete according to the plane of the tensioning platform, watering, pouring and curing, pouring concrete of a tensioning and lifting post-pouring belt and the front end C50 of the pedestal, and watering and curing;
e installation of prestressed stretch-draw bench basement membrane
The bottom film of the channel steel of the prestress tensioning table is provided with a main beam and a secondary frame beam which are spliced reversely, and the bottom film of the channel steel is a secondary beam bottom film reversely; the primary beam, the secondary frame beam and the secondary beam bottom membrane are fixed by using angle steel as a beam position template bottom support and an angle steel template lower side support;
f. construction acceptance of prestressed pedestal and tensioning table
After the construction of the prestress pedestal and the tensioning platform is finished, the examination and acceptance are organized, and the settlement and deformation of the pedestal and the deformation of the tensioning platform are observed according to the standard and drawing requirements.
2. The construction method of the integral weight type pretensioning prestressed tensioning platform according to claim 1, wherein the reinforced concrete raft is a C40 reinforced concrete raft 23-600 mm thick.
3. The method for constructing the prestressed tensioning table by using integral weight type pretensioning method according to claim 1, wherein the steel upright is made of H800X350X14X 16.
4. The construction method of an integral weight type pretensioned prestressing tension table according to claim 1, wherein the number of the steel columns for connecting the steel beams is determined according to the number of the tension line arrangements.
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