CN111910667A - Construction method of split counterweight and integral counterweight combined pre-tensioning method prestress tensioning platform - Google Patents
Construction method of split counterweight and integral counterweight combined pre-tensioning method prestress tensioning platform Download PDFInfo
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
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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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- 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
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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
Abstract
A split counterweight and integral counterweight combined pretensioning method prestress tensioning platform construction method is characterized by comprising the following steps: 1) a construction method of a split counterweight type pretensioning method prestress tensioning table, 2) a construction method of an integral counterweight type pretensioning method prestress tensioning table, wherein a counterweight part of a prestress tensioning table seat and a tensioning end part of the front end of the prestress tensioning table seat are arranged on the same raft foundation. The construction method of the split counterweight and integral counterweight combined pretensioned prestressing tensioning table has the advantages that the construction method of the split counterweight and integral counterweight combined pretensioned prestressing tensioning table is scientific and reasonable in design, strong in operability and suitable for installation and manufacture on a construction site, and the split and integral design idea and the steel structure assembly form achieve the advantages that a pier-type pedestal can not be used for producing large-scale components and can repeatedly produce prestressed components in large batch, the tensioning length of the prestressed components can reach more than 250 meters, and a steel structure part is dismantled for recycling after the engineering is finished.
Description
Technical Field
The invention relates to a pretensioning method prestress tensioning table, in particular to a construction method of a pretensioning method prestress tensioning table combining split counterweight and integral counterweight.
Background
At the present stage, governments in various places have certain requirements on building assembly rate, countries develop assembly type structures, and pretensioning prestressed structural members serve as one of the assembly type members, so that the assembly type structure 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, and the groove type pedestal comprises a gravity pier, a tensioning corbel, 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, the prestressed components cannot be produced in large batch and repeatedly, and the length cannot reach more than 250 meters.
Therefore, the construction method of the pre-tensioning pre-stressed tensioning table has various inconveniences and problems.
Disclosure of Invention
The invention aims to provide a safe and reliable construction method of a split counterweight and integral counterweight combined pretensioning method prestress tensioning table.
In order to achieve the purpose, the technical solution of the invention is as follows:
a split counterweight and integral counterweight combined pretensioning method prestress tensioning platform construction method is characterized by comprising the following steps:
1) the construction method of the split counterweight pre-tensioning method pre-stressed tensioning platform is characterized by comprising the following steps of:
a. split counterweight type pretensioning method tensioning pedestal counterweight foundation construction
The counterweight foundation of the split counterweight type pretensioning tensioning pedestal is a reinforced concrete raft, three-level steel phi 14@150 and double-layer bidirectional, wherein bottom plate steel bars are placed on the bottom steel bars of the beam, C35 concrete is poured and maintained;
b. split counterweight type pre-tensioning method for tensioning part of pile foundation at front end of pedestal
Firstly, constructing a connecting pipe pile of the same pile foundation and a bearing platform, then constructing a pile core reinforcement cage, and pouring and curing C35 concrete after the reinforcement cage is installed;
c. split counterweight type pre-tensioning method for tensioning upper part of foundation at front end of pedestal
The method comprises the following steps of (1) carrying out construction on steel bars on the upper part and the lower part of a foundation by tensioning the front end of a tensioning pedestal by a split counterweight type pretensioning method, pouring C35 concrete after the installation of the steel bars is finished, and maintaining;
d. construction of counterweight part of split counterweight type pretensioning tensioning pedestal
The method comprises the steps that a counterweight part of a split counterweight type pretensioning tensioning pedestal is backfilled and tamped with original soil, then a bidirectional reinforced concrete terrace is constructed, then a counterweight fence is installed on the terrace, after a steel supporting frame is assembled, a waste template is fixed in the frame, and broken stones are filled in a combined fence;
e. the split counterweight type pretensioning method tensioning pedestal prestress front end tensioning steel structure part is constructed by connecting a dual-channel steel and a steel anchor rope with a counterweight part; the steel column is anchored by adopting a high-strength bolt and connected with a steel beam, and a gap between the steel column and the foundation is filled with micro-expansion concrete;
f. partial construction of stretch-draw stands
The part of the cushion layer of the tensioning table is a concrete cushion layer, longitudinal stressed steel bars of the tensioning table are arranged, and the tie bars are arranged in a quincunx shape by three-level steel phi 8@400 of the tensioning table and pedestal tie bars; firstly pouring concrete in the area I according to a plane drawing of a tensioning platform, and watering, pouring and curing;
g. installation of bottom die of prestress tensioning table
The bottom die of the prestress tensioning table is provided with a bottom die of a channel steel bottom die which is reversely spliced into a main beam and a secondary frame beam;
h. 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 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 formed, 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 of upper. 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 split counterweight type and integral counterweight type pretensioning method prestress tensioning platform can be further realized by adopting the following technical measures.
In the method, the split counterweight type pretensioning tensioning pedestal counterweight foundation reinforced concrete raft is a reinforced concrete raft with the thickness of 400 mm.
In the method, the tubular pile at the front end of the split counterweight type pretensioning tensioning table is a plurality of PHC phi 500mm tubular piles.
The method, wherein the number of the steel columns for connecting the steel beams is determined according to the number of the tension lines.
In the above method, the material of the steel column is H800X350X14X 16.
By adopting the technical scheme, the construction method of the split counterweight and integral counterweight combined pretensioned prestressing tensioning table has the following advantages:
1. the construction method of the split counterweight and integral counterweight combined pretensioning method prestress tensioning platform is scientific and reasonable in design and strong in operability;
2. the engineering quality is safe and reliable, and the method is suitable for installation and manufacturing on a construction site;
3. the split type and integral design idea and the steel structure assembly form that the pier-type pedestal does not have can produce large-scale components and can produce prestressed components in a large batch and repeatedly, the tensioning length of the prestressed components can reach more than 250 meters, and the steel structure part is dismantled for recycling after the project is finished.
Drawings
FIG. 1 is a schematic structural view of a split counterweight pretensioned prestressed concrete pedestal according to an embodiment of the present invention;
FIG. 2 is a schematic view of the counterweight base of FIG. 1;
FIG. 3 is a schematic structural view of a bottom mold of the tension table of FIG. 1;
FIG. 4 is a front elevational schematic view of the counterweight frame of FIG. 1;
FIG. 5 is a schematic plan view of the tensioning station of FIG. 1;
FIG. 6 is a schematic view of an embodiment of the present invention of an integrally weighted pretensioned prestressed concrete foundation;
FIG. 7 is a schematic structural view of a bottom mold of the tension table of FIG. 6;
FIG. 8 is a front elevational view of the counterweight frame of FIG. 6;
fig. 9 is a schematic view of the construction sequence of the tensioning table concrete in fig. 6.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example 1
The invention discloses a construction method of a split counterweight and integral counterweight combined pretensioned prestressing tensioning table, which comprises the following steps:
a construction method of a split counterweight pre-tensioning prestressed tensioning platform, please refer to fig. 1-5, comprising the following steps:
1. constructing a counterweight foundation part 1 of a split counterweight type pretensioning tensioning pedestal: the foundation 23 is a 400mmC35 reinforced concrete raft, three-level steel phi 14@150, double-layer and bidirectional, and bottom plate steel bars are placed on the steel bars at the bottom of the beam; the anchoring beam is 700X700, the upper stressed steel bar is 35-the upper longitudinal stressed steel bar three-level steel 6 phi 20, 36-the anchor cable beam stirrup three-level steel phi 10@100, 37-the lower longitudinal stressed steel bar three-level steel 6 phi 20, 38-the anchoring plate 200X200X16 steel plate anchoring end, after the installation of the steel bar is finished, C35 concrete is poured and maintained.
2. The construction of a part of pile foundation 2 at the front end of the split counterweight type pretensioning method tensioning pedestal is as follows: firstly constructing 25-5 PHC phi 500 tubular piles, then constructing 26-pile core reinforcement cages (the same pile foundation and pile cap connecting method) 6 three-level steel phi 18, extending into the piles to 1500, anchoring into the beams to 800, hooping three-level steel phi 8@200, 24-pile core concrete bottom plates to form round steel plates with the thickness of 4, and then pouring C35 concrete and maintaining.
3. The construction of the upper part of the foundation of the tensioning part at the front end of the split counterweight type pretensioning method tensioning pedestal is as follows: 27-100 thick C15 concrete of cushion layer, the shape of upper foundation (designed by designer), 48-front end tension lifting part foundation longitudinal stress steel bar three-level steel phi 16@200 of foundation lower reinforcing steel bar, 21-front end tension part foundation subsection reinforcing steel bar three-level steel phi 8@200 of distribution reinforcing steel bar, 49-pile foundation and upper foundation connecting reinforcing steel bar three-level steel 4 phi 25, 28-tension pedestal longitudinal stress steel bar three-level steel phi 16@200, 18-M24 anchor bolt (connecting steel upright post and tension front end concrete are arranged along the axis of anchor post), 20-M30 tension post pre-embedded anchor bolt, after the steel bar is installed, pouring C35 concrete and maintaining.
4. Constructing a counterweight part 3 of the split counterweight type pretensioning tensioning pedestal: the method comprises the steps of firstly constructing 6-700-thick original soil backfill and tamping, then constructing a 100-thick three-level steel phi 8@200 bidirectional reinforced concrete terrace, then installing a counterweight fence on the terrace, 7-lower-end fine deformed steel bar anchoring, 8-lower-end 25# b channel steel, 9-16# b channel steel @400, 10-upper-end fine deformed steel bar anchoring and 11-upper-end 25# b channel steel, assembling a steel supporting frame, fixing 39-12-18 mm-thick waste templates in the frame, and filling 12-broken stone in a combined fence.
5. And (3) constructing a tensioning steel structure part 4 at the prestress front end of the split counterweight type pretensioning tensioning pedestal: 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.
6. And (3) construction of a tensioning platform part 5: the cushion layer is 27-100 thick C15 concrete cushion layer and 34-tensioning platform 50mm thick C15 concrete
A cushion layer; the front end of the longitudinal stressed steel bar of the tensioning table is 28-the third-level steel phi 16@200 of the longitudinal stressed steel bar of the tensioning table seat, and the rear end of the longitudinal stressed steel bar of the tensioning table is 31-the third-level steel phi 10@200 of the longitudinal stressed steel bar of the tensioning table seat; the front end of the distribution steel bar of the stretching table is 29-stretching table and the three-level steel phi 8@200 of the horizontal distribution steel bar of the pedestal; the tie bars are arranged in a quincunx shape by a 30-tensioning platform and a pedestal tie bar three-level steel phi 8@400 bidirectional draw hook; and 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, spraying water, pouring and curing, pouring 46-stretching and lifting post-cast strip and pedestal front end C50 concrete 28 days later, and spraying water for curing.
7. 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.
8. 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.
Secondly, the technical scheme of the integral counterweight pre-tensioning method prestress tensioning platform is shown in fig. 6-9, and the method 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 20 and erection reinforcement third-level steel 4 phi 16; the cushion layer is a 57-50 thick C15 concrete foundation cushion layer; the method comprises the steps of firstly, stretching a platform to form a top foundation 600 thick C40 reinforced concrete, stressed steel bars 59-a top foundation C40 reinforced concrete stressed steel bar three-level steel 14@150, distributed steel bars 60-a top foundation C40 reinforced concrete distributed steel bar three-level steel 10@150, pouring C40 concrete after the installation of the steel bars is finished, watering and maintaining, backfilling 58-gravel tamping in the middle of the foundation, and pouring a 22-100 thick C20 concrete terrace on the top.
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.
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. And 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, spraying water, pouring and curing, pouring 46-stretching and lifting post-cast strip and pedestal front end C50 concrete 28 days later, and spraying water for 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.
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.
Wherein: the pedestal counterweight part is suitable for a raft foundation, the front end tensioning part adopts an independent foundation or an integral pile foundation as an integral raft foundation, the counterweight part adopts channel steel, finish rolling deformed steel bar, a template and other forms for combination, the counterweight part is installed on the counterweight foundation, masonry, sand or soil are filled inside the counterweight part, the front end tensioning part adopts H-shaped steel for assembly, the counterweight part is connected with the rear counterweight part through a steel cable or finish steel, the tensioning field concrete part adopts C50 high-strength concrete and is closely connected with the pedestal front end, the resistance of the pedestal front end tensioning part is improved, the bottom die of the precast beam in the tensioning field adopts a channel steel back-buckling form, and the forming effect and the anti-damage capability of the bottom of the precast beam. When the specific size in the drawing is that the steel strand is more than or equal to 200 and 250 meters of tensioning length, the specific size is designed by a designer according to the actual engineering situation.
The invention has substantive characteristics and obvious technical progress, the construction method of the split counterweight and integral counterweight combined pretensioning method prestress tensioning table of the invention is completely different from a groove type pedestal and a steel mold pedestal in stress action and shape, can be divided into the range of a pier type pedestal, but is different from a gravity type, a table top working action type, a framework type and a pile foundation framework type, the invention combines the advantages of the gravity type, the pile foundation framework type and the table top coaction type, moves the counterweight part to the upper part of the ground, adopts a steel structure assembly form, realizes the installation and manufacture suitable for a construction site, avoids the complex procedures of underground construction and precipitation, can save the cost, and adopts a split and integral design idea and a steel structure assembly form to produce large-scale components which the pier type pedestal does not have, the prestressed member can be produced in large batch and repeatedly, the tensioning length of the prestressed member can reach more than 250 meters, and the steel structure part is dismantled for recycling after the engineering is finished. The method is suitable for wider geological conditions, such as the existence of weak hypo-bedding and other geological conditions.
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 (5)
1. A split counterweight and integral counterweight combined pretensioning method prestress tensioning platform construction method is characterized by comprising the following steps:
1) the construction method of the split counterweight pre-tensioning method pre-stressed tensioning platform is characterized by comprising the following steps of:
a. split counterweight type pretensioning method tensioning pedestal counterweight foundation construction
The counterweight foundation of the split counterweight type pretensioning tensioning pedestal is a reinforced concrete raft, three-level steel phi 14@150 and double-layer bidirectional, wherein bottom plate steel bars are placed on the bottom steel bars of the beam, C35 concrete is poured and maintained;
b. split counterweight type pre-tensioning method for tensioning part of pile foundation at front end of pedestal
Firstly, constructing a connecting pipe pile of the same pile foundation and a bearing platform, then constructing a pile core reinforcement cage, and pouring and curing C35 concrete after the reinforcement cage is installed;
c. split counterweight type pre-tensioning method for tensioning upper part of foundation at front end of pedestal
The method comprises the following steps of (1) carrying out construction on steel bars on the upper part and the lower part of a foundation by tensioning the front end of a tensioning pedestal by a split counterweight type pretensioning method, pouring C35 concrete after the installation of the steel bars is finished, and maintaining;
d. construction of counterweight part of split counterweight type pretensioning tensioning pedestal
The method comprises the steps that a counterweight part of a split counterweight type pretensioning tensioning pedestal is backfilled and tamped with original soil, then a bidirectional reinforced concrete terrace is constructed, then a counterweight fence is installed on the terrace, after a steel supporting frame is assembled, a waste template is fixed in the frame, and broken stones are filled in a combined fence;
e. construction of split counterweight type pretensioning method tensioning pedestal prestress front end tensioning steel structure part
The tensioning steel structure part at the prestress front end of the split counterweight type pretensioning method tensioning pedestal is connected with the counterweight part by adopting double channel steel and a steel anchor cable; the steel column is anchored by adopting a high-strength bolt and connected with a steel beam, and a gap between the steel column and the foundation is filled with micro-expansion concrete;
f. partial construction of stretch-draw stands
The part of the cushion layer of the tensioning table is a concrete cushion layer, longitudinal stressed steel bars of the tensioning table are arranged, and the tie bars are arranged in a quincunx shape by three-level steel phi 8@400 of the tensioning table and pedestal tie bars; firstly pouring concrete in the area I according to a plane drawing of a tensioning platform, and watering, pouring and curing;
g. installation of bottom die of prestress tensioning table
The bottom die of the prestress tensioning table is provided with a bottom die of a channel steel bottom die which is reversely spliced into a main beam and a secondary frame beam;
h. after the construction of the prestress pedestal and the tensioning table is finished, organizing and checking, and observing the settlement and deformation of the pedestal and the deformation of the tensioning table according to the standard and drawing requirements;
2) 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 split counterweight and integral counterweight combined pretensioning prestressed tensioning platform according to claim 1, wherein the split counterweight type pretensioning tensioning pedestal counterweight basic reinforced concrete raft is a reinforced concrete raft with a thickness of 400 mm.
3. The method for constructing a pre-tensioning pre-stressed tensioning table by combining a split counterweight and an integral counterweight according to claim 1, wherein the tensioning part of the tubular pile at the front end of the split counterweight pre-tensioning table is a plurality of PHC (prestressed high-strength concrete) phi 500mm tubular piles.
4. The construction method of the split counterweight and integral counterweight combined pretensioning prestressed tensioning table according to claim 1, wherein the number of the steel columns for connecting the steel beams is determined according to the layout number of the tensioning lines.
5. The construction method of the split counterweight and integral counterweight combined pretensioning prestressed tensioning platform as claimed in claim 1, wherein the steel upright is made of H800X350X14X 16.
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| CN112431217A (en) * | 2020-12-03 | 2021-03-02 | 上海二十冶建设有限公司 | Construction method of large skid-mounted cold box pile-free anti-seismic raft foundation |
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