CN113550595B - Bonded prestress construction process for skirt house frame beam construction - Google Patents
Bonded prestress construction process for skirt house frame beam construction Download PDFInfo
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- CN113550595B CN113550595B CN202110848040.1A CN202110848040A CN113550595B CN 113550595 B CN113550595 B CN 113550595B CN 202110848040 A CN202110848040 A CN 202110848040A CN 113550595 B CN113550595 B CN 113550595B
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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
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/04—Mats
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/08—Members specially adapted to be used in prestressed constructions
- E04C5/12—Anchoring devices
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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
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
-
- 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
- E04G21/122—Machines for joining reinforcing bars
- E04G21/123—Wire twisting tools
-
- 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
- E04G2021/128—Prestressing each strand of a cable one by one to the same tension
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a construction process with bonding prestress for skirt house frame beam construction, which comprises the following steps: a, assembling a first anchor backing plate with a fixed end of a bonding prestressed rib and a corresponding first anchor device, conveying corrugated pipes and steel wire ropes to a laying part, wherein each steel wire rope is correspondingly provided with the first anchor backing plate, each first anchor backing plate is correspondingly provided with the first anchor device, the first anchor devices are used for anchoring the end parts of the steel wire ropes to the corresponding first anchor backing plates, all the first anchor backing plates are arranged along the spherical surface, supporting a bottom die of a frame beam of a skirt house, and binding common steel bars of the beam; b, laying a corrugated pipe, penetrating a steel wire rope, fixing the corrugated pipe, installing an exhaust hole and tensioning end nodes with bonding prestressed tendons; c, binding reinforcing steel bars at the tensioning end, supporting beam side molds and plate bottoms, and laying floor reinforcing steel bars; d, pouring concrete, erecting tensioning equipment, tensioning the prestressed reinforcing steel after the concrete reaches the tensioning strength, and grouting in the corrugated pipe after tensioning is correct; e, sealing the anchor by concrete at the end part of the prestressed tendon. The construction process has the advantages of simple steps, convenient operation and good effect.
Description
Technical Field
The invention relates to the field of building construction, in particular to a construction process with bonding prestress for skirt house frame beam construction.
Background
Because the skirt house frame beam has large span and large load, in order to improve the bearing capacity and control deflection and cracks, adhesive prestressed tendons can be configured as required; in the existing fixed end node structure with bonding prestressed tendons, a plurality of steel wire ropes are sleeved in a corrugated pipe, the end part of the corrugated pipe is connected with an anchor backing plate, and all the steel wire ropes are anchored on the anchor backing plate through a group anchor anchorage device; the existing fixed end node structure with the bonded prestressed tendons is anchored intensively, when the prestressed tendons are subsequently released, the prestressed tendons can cause large concentrated stress to the structure around the anchor backing plate, and the structure around the anchor backing plate is cracked and damaged seriously, so that the skirt house frame beam does not reach the standard, and therefore a new bonded prestressed construction process for skirt house frame beam construction is needed.
Disclosure of Invention
The invention aims to: aiming at the problems that the existing fixed end node structure with the bonded prestressed tendon in the prior art is anchored intensively, and the prestressed tendon can cause larger concentrated stress to the structure around the anchor backing plate when the prestressed tendon is subsequently released, and the structure around the anchor backing plate is cracked and damaged seriously, so that the skirt house frame beam cannot reach the standard, the bonded prestressed construction process for skirt house frame beam construction is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a bonded prestress construction process for skirt house frame beam construction comprises the following steps:
A. the steel wire rope fixing device comprises a plurality of steel wire rope fixed length materials with bonded prestressed ribs, a first anchor backing plate with a bonded prestressed rib fixed end and a corresponding first anchor device, a corrugated pipe with bonded prestressed ribs and a steel wire rope, wherein the steel wire rope is transported to a laying part, each steel wire rope is correspondingly provided with one first anchor backing plate, each first anchor backing plate is correspondingly provided with one first anchor device, each first anchor device is used for anchoring the end part of the steel wire rope to the corresponding first anchor backing plate, all the first anchor backing plates are arranged along a spherical surface, a skirt house frame beam bottom die is arranged, and common beam steel bars are bound;
B. laying the corrugated pipe, penetrating the steel wire rope, fixing the corrugated pipe, installing an exhaust hole and stretching end nodes with bonded prestressed tendons;
C. binding the reinforcing steel bars at the tensioning end, supporting the beam side mold and the slab bottom, and laying the reinforcing steel bars of the floor slab;
D. pouring concrete, erecting tensioning equipment, tensioning the prestressed tendons after the concrete reaches the tensioning strength, and grouting in the corrugated pipe after tensioning is correct;
E. and (5) sealing the anchor by concrete at the end part of the prestressed tendon.
By adopting the construction process with bonding prestress for the skirt house frame beam construction, all the steel wire ropes in the prestressed tendons are dispersedly anchored through the first anchor backing plate and the corresponding first anchorage device, so that the problem of stress concentration on the skirt house frame beam structure around the first anchor backing plate after tension releasing is avoided; all the first anchor backing plates are arranged along a spherical surface, namely the bearing surfaces of all the first anchor backing plates are propped by an imaginary sphere, so that the bearing is more uniform, and the stability of an anchoring structure is facilitated; the bonded prestress construction process for the skirt house frame beam construction is simple in steps, convenient to operate and good in effect.
Preferably, first anchor backing plate includes backing plate body, through-hole and cell body, the through-hole is located backing plate body centroid department, the through-hole is used for wire rope passes the backing plate body, the cell body connect in backing plate body one side, just the tank bottom intercommunication of cell body the through-hole, wire rope can pass the through-hole gets into the cell body, the cell body is used for setting first ground tackle.
Further preferably, the base plate body and the groove body are integrally formed members.
Further preferably, a chamfer is arranged between the base plate body and the groove body, so that the structural performance is enhanced, and the deformation of the base plate body is reduced.
Preferably, the end part of the corrugated pipe is a sealing end, so that cement paste is prevented from being poured into the corrugated pipe when concrete is poured.
Further preferably, the end of the bellows is provided with a filler to form the sealed end.
Preferably, the first anchor is a clip anchor.
Preferably, the stretch-draw end node includes second anchor backing plate, second ground tackle, a plurality of reinforcing bar net piece and reserves the beard muscle, the second anchor backing plate passes through the horn tube and connects the bellows, all wire rope passes through the second ground tackle anchor in the second anchor backing plate, the second anchor backing plate is located the reinforcing bar net piece with in the steel reinforcement cage that the reservation beard muscle formed, after the prestressing tendons stretch-draw, pour the post-cast concrete among the stretch-draw end node.
Further preferably, the post-cast concrete is micro-expansion fine aggregate concrete.
Further preferably, the second anchor is a grouser anchor.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
according to the bonded prestress construction process for the skirt house frame beam construction, all the steel wire ropes in the prestressed tendons are dispersedly anchored through the first anchor backing plate and the corresponding first anchorage device, so that the problem of stress concentration on the skirt house frame beam structure around the first anchor backing plate after tension releasing is avoided; all the first anchor backing plates are arranged along a spherical surface, namely the bearing surfaces of all the first anchor backing plates are propped by an imaginary sphere, so that the bearing is more uniform, and the stability of an anchoring structure is facilitated; the construction process with the bonding prestress for the skirt house frame beam construction is simple in steps, convenient to operate and good in effect.
Drawings
FIG. 1 is a schematic flow chart of the construction process with bonding prestress for the construction of the skirt house frame beam according to the invention;
FIG. 2 is a schematic view of the structure of the fixed end of the skirt frame beam with the bonded prestressed tendons;
FIG. 3 is a schematic view of the construction of the first anchor pad;
fig. 4 is a schematic diagram of the structure of the skirt frame beam with the bonded prestressed tendon tensioning end.
The mark in the figure is: 1-steel wire rope, 2-corrugated pipe, 21-sealed end, 3-first anchor backing plate, 31-backing plate body, 32-through hole, 33-groove body, 34-chamfer, 4-first anchor, 5-second anchor backing plate, 6-second anchor, 7-reinforcing steel bar net piece, 8-reserved beard rib, and 9-post-cast concrete.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in fig. 1 to 4, the bonded prestressed construction process for the skirt-house frame beam construction according to the present invention includes the following steps:
A. the method comprises the following steps of (1) fixing a plurality of steel wire ropes (1) with bonded prestressed tendons, assembling an extrusion anchor with a fixed end of the bonded prestressed tendons, wherein the extrusion anchor comprises first anchor backing plates (3) and corresponding first anchorage devices (4), corrugated pipes (2) with the bonded prestressed tendons, and the steel wire ropes (1) are transported to a laying part, each steel wire rope (1) is correspondingly provided with one first anchor backing plate (3), each first anchor backing plate (3) is correspondingly provided with one first anchorage device (4), each first anchorage device (4) is used for anchoring the end part of each steel wire rope (1) to the corresponding first anchor backing plate (3), all the first anchor backing plates (3) are arranged along a spherical surface, and a skirt house frame beam bottom die is supported to bind common steel bars of the beam;
wherein, first anchor backing plate 3 includes backing plate body 31, through-hole 32 and cell body 33, through-hole 32 is located backing plate body 31 centroid department, through-hole 32 is used for wire rope 1 passes backing plate body 31, cell body 33 connect in backing plate body 31 one side, just the tank bottom intercommunication of cell body 33 through-hole 32, wire rope 1 can pass through-hole 32 gets into cell body 33, cell body 33 is used for setting up first ground tackle 4, backing plate body 31 with be equipped with chamfer 34 between cell body 33, strengthen the structural performance, reduce backing plate body 31 warp, prefers in this embodiment backing plate body 31 with cell body 33 is the integrated into one piece component, first ground tackle 4 is the splint formula anchor.
B. Binding control point high erection bars, laying the corrugated pipe 2, penetrating the steel wire rope 1, fixing the corrugated pipe 2, installing exhaust holes and tensioning end nodes with bonding prestressed bars; the method comprises the following specific steps:
b1, preparation before laying
Laying non-prestressed tendons: firstly, laying a non-prestressed reinforcement framework, and adopting a quick-release system for a floor slab template and a support in order to save the using amount of the template;
preparing an end die: according to the practical situation and the design requirement of the project, the embedded horn tube is fixed on the end mould before mould closing, so that the end mould is prepared in advance, and the size of the end mould is accurate;
preparing a frame stud: setting erection ribs at intervals of about 1.0m according to a design drawing, wherein the erection ribs are threaded reinforcing steel bars with the diameter of 12 mm;
blanking of the corrugated pipe 2: during blanking, the length of a joint between pipes is not less than 30cm, two ends of the joint are respectively screwed into the joints, the joints are sealed by using adhesive tapes, the pipe diameter of the connecting joint is larger than the diameter of the pipeline by one size, an exhaust hole is reserved in the corrugated pipe 2 and can be used as a grouting hole during multi-span, and the joints of the pipe fittings and the air outlet pipe are sealed by using sealing adhesive tapes so as to prevent slurry leakage;
blanking the prestressed tendon and assembling the fixed end extrusion anchor;
b2, laying the corrugated pipe 2
Erecting ribs by using a mounting rack: welding or binding the frame vertical bar and the stirrup firmly, wherein the position of the top surface of the frame vertical bar is determined by subtracting the radius of the corrugated pipe 2 from the rise from the plate bottom according to the center line of the prestressed bar shown in a drawing, and in order to ensure the rise accuracy and smooth curve of the prestressed bar, when the prestressed beam is constructed, the positioning bar is welded or bound firmly according to the requirement of the rise of the prestressed bar in a construction drawing and the position of the marked positioning bar;
installing a horn tube: installing the horn tube on an end die or a non-prestressed reinforcement framework according to the position shown by a design drawing;
penetrating the corrugated pipe 2: the corrugated pipe 2 is penetrated according to the drawing position, 4-5 persons are used for arranging along the two sides of the girder, the corrugated pipe 2 is penetrated from one end, after the pipes are completely penetrated, the two ends of the pipe are inserted into the positioned horn pipes, and the joint of the corrugated pipe 2 and the horn pipes is wound and sealed by using adhesive tapes, so that slurry leakage is avoided;
when the corrugated pipe 2 is laid, the corrugated pipe is strictly positioned according to the design drawing and the requirements of the construction scheme, and the size and the linear shape are ensured; the positioning of the horn tube needs to be accurate; the bellows 2 must be transversely arranged along a central line or be symmetrical to the central line, and S bending is not required; sealing all connecting parts such as the positions of the horn pipe and the corrugated pipe 2, the positions of reserved mounting group anchors at the tensioning end and the end heads of the exhaust holes, and sealing various joints by using adhesive tapes without slurry leakage; after laying and in the concrete pouring process, strictly preventing the corrugated pipe from being flattened and damaged, and strictly preventing the corrugated pipe 2 from being welded by gas;
and B3, the steel wire rope 1 adopts a method of beam splitting and multiple penetration, the steel wire rope 1 needs to be subjected to fixed-length blanking, the steel wire rope 1 is cut by using a grinding wheel saw and is not required to be cut by electric welding, the prestressed tendon penetrates from the fixed end to the tensioning end to avoid distortion, if the field fixed end does not have a tendon penetrating position, the corrugated pipe 2 and the prestressed tendon are assembled well firstly and are synchronously carried out with the non-prestressed tendon, and the electric welding is not required to be used after the steel wire rope 1 penetrates into a pore channel so as to avoid reducing the strength of the prestressed tendon.
C. Binding a tensioning end reinforcing steel bar, a supporting beam side mold and a slab bottom, and laying a floor slab reinforcing steel bar; the method comprises the following specific steps:
the length (reserved tensioning length) of the prestressed tendon extending out of the horn tube is required to meet the tensioning requirement; the interface between the horn tube and the corrugated tube 2 and the interface between the exhaust hole and the corrugated tube 2 are sealed firmly by applying an adhesive tape, so that slurry leakage is avoided; the end parts of the corrugated pipes at the stretching end and the fixed end are firmly plugged by using fillers, so that cement paste is prevented from being poured into the corrugated pipes when concrete is poured; the prestressed tendons must be vertical to the outer surface of the horn tube, and a straight line section which is not less than 30cm is needed behind the bearing plate; binding steel bar net sheets 7 according to requirements after tensioning the tensioning ends of the prestressed tendons, and binding the steel bar net sheets 7 on each fixed end;
the end part of the corrugated pipe 2 is a sealing end 21, so that cement paste is prevented from being poured into the corrugated pipe 2 when concrete is poured, and the end part of the corrugated pipe 2 is provided with filler to form the sealing end 21.
D. Pouring concrete, erecting tensioning equipment, tensioning the prestressed reinforcing steel after the concrete reaches the tensioning strength, and grouting in the corrugated pipe 2 after tensioning is correct;
stretch-draw end node includes second anchor backing plate 5, second ground tackle 6, a plurality of reinforcing bar net piece 7 and reserves beard muscle 8, second anchor backing plate 5 is through the horn tube connection bellows 2, all wire rope 1 passes through 6 anchors of second ground tackle in second anchor backing plate 5, second anchor backing plate 5 is located reinforcing bar net piece 7 with in the reinforcing bar cage that reserves 8 formation of beard muscle, 6 anchor tackle of second ground tackle are group's anchor tackle.
E. Sealing the anchor by concrete at the end part of the prestressed tendon; after the prestressed tendons are tensioned, post-cast concrete 9 is poured in the tensioning end nodes, and in this embodiment, the post-cast concrete 9 is preferably C40 micro-expansion fine aggregate concrete.
By applying the construction process with bonding prestress for the skirt house frame beam construction, all the steel wire ropes 1 in the prestressed tendon are dispersedly anchored through the first anchor backing plate 3 and the corresponding first anchorage devices 4, so that the problem of stress concentration on the skirt house frame beam structure around the first anchor backing plate 3 after tension releasing is avoided; all the first anchor backing plates 3 are arranged along a spherical surface, namely the bearing surfaces of all the first anchor backing plates 3 are propped by an imaginary sphere, so that the bearing is more uniform, and the stability of an anchoring structure is facilitated; the construction process with the bonding prestress for the skirt house frame beam construction is simple in steps, convenient to operate and good in effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A bonded prestress construction process for skirt house frame beam construction is characterized by comprising the following steps:
A. the method comprises the steps that a plurality of steel wire ropes (1) with bonded prestressed tendons are made into fixed-length materials, first anchor backing plates (3) with fixed ends of the bonded prestressed tendons and corresponding first anchorage devices (4) are assembled, corrugated pipes (2) with the bonded prestressed tendons and the steel wire ropes (1) are transported to a laying part, each steel wire rope (1) is correspondingly provided with one first anchor backing plate (3), each first anchor backing plate (3) is correspondingly provided with one first anchorage device (4), each first anchorage device (4) is used for anchoring the end portions of the steel wire ropes (1) to the corresponding first anchor backing plates (3), all first anchor backing plates (3) are arranged along a spherical surface, the bearing surfaces of all first anchor backing plates (3) are propped against an imaginary sphere, a bottom die of a beam of a skirt house frame, and common reinforcing steel bars of a binding beam are supported;
B. laying the corrugated pipe (2), penetrating the steel wire rope (1), fixing the corrugated pipe (2), installing an exhaust hole and tensioning end nodes with bonded prestressed tendons;
C. binding the reinforcing steel bars at the tensioning end, supporting the beam side mold and the slab bottom, and laying the reinforcing steel bars of the floor slab;
D. pouring concrete, erecting tensioning equipment, tensioning the prestressed tendons after the concrete reaches the tensioning strength, and grouting in the corrugated pipe (2) after tensioning is correct;
E. sealing the anchor by concrete at the end part of the prestressed tendon;
first anchor backing plate (3) are including backing plate body (31), through-hole (32) and cell body (33), through-hole (32) are located backing plate body (31) centroid department, through-hole (32) are used for wire rope (1) passes backing plate body (31), cell body (33) connect in backing plate body (31) one side, just the tank bottom intercommunication of cell body (33) through-hole (32), wire rope (1) can pass through-hole (32) get into cell body (33), cell body (33) are used for setting up first ground tackle (4), backing plate body (31) with cell body (33) are the integrated into one piece component, backing plate body (31) with be equipped with chamfer (34) between cell body (33).
2. The bonded prestressed construction process for skirt house frame beam construction according to claim 1, characterized in that the end of the corrugated tube (2) is a sealed end (21).
3. The construction process with adhesive prestress for the frame beam of the skirt house according to claim 2, characterized in that the end of the corrugated pipe (2) is provided with filler to form the sealing end (21).
4. The bonded prestressed construction process for skirt house frame beam construction according to claim 1, characterized in that the first anchorage device (4) is a clip type anchorage device.
5. The bonded prestressed construction process for skirt house frame beam construction according to any one of claims 1-4, characterized in that the tension end nodes comprise a second anchor pad plate (5), a second anchorage device (6), a plurality of steel bar net sheets (7) and reserved beard bars (8), the second anchor pad plate (5) is connected with the corrugated pipe (2) through a horn tube, all the steel wire ropes (1) are anchored to the second anchor pad plate (5) through the second anchorage device (6), the second anchor pad plate (5) is arranged in a steel bar cage formed by the steel bar net sheets (7) and the reserved beard bars (8), and after the tension bars are tensioned, post-cast concrete (9) is poured into the tension end nodes.
6. The construction process with cohesive prestress for the construction of the skirt house frame beam according to claim 5, characterized in that the post-cast concrete (9) is micro-expanded fine-stone concrete.
7. The bonded prestressed construction process for skirt house frame beam construction according to claim 5, characterized in that said second anchorage device (6) is a group anchorage device.
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| CN202110848040.1A CN113550595B (en) | 2021-07-27 | 2021-07-27 | Bonded prestress construction process for skirt house frame beam construction |
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| CN201459716U (en) * | 2009-08-03 | 2010-05-12 | 天津市建筑科学研究院 | Retard-bonded or unbonded post-tensioned prestressing filling pile |
| JP5864900B2 (en) * | 2011-05-18 | 2016-02-17 | 岡部株式会社 | Existing foundation reinforcement method and existing foundation reinforcement structure |
| CN108951401A (en) * | 2017-05-20 | 2018-12-07 | 马鞍山平文锻造有限公司 | A kind of novel high-strength anchorage |
| CN110607841B (en) * | 2019-10-18 | 2021-10-15 | 中国建筑第八工程局有限公司 | Wind tunnel prestress construction process |
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