CN108532835B - Longitudinal cracking restraining device for pre-tensioned prestressed concrete beam and construction method thereof - Google Patents
Longitudinal cracking restraining device for pre-tensioned prestressed concrete beam and construction method thereof Download PDFInfo
- Publication number
- CN108532835B CN108532835B CN201810233078.6A CN201810233078A CN108532835B CN 108532835 B CN108532835 B CN 108532835B CN 201810233078 A CN201810233078 A CN 201810233078A CN 108532835 B CN108532835 B CN 108532835B
- Authority
- CN
- China
- Prior art keywords
- prestressed
- pretensioned
- composite material
- reinforcing
- spring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
The invention discloses a longitudinal cracking restraining device for a pretensioned prestressed concrete beam and a construction method thereof, wherein the device comprises a plurality of local reinforcing devices, and each local reinforcing device comprises a spring hoop and a reinforcing rib; the spring hoop is sleeved on the prestressed tendon, the reinforcing rib is connected with the spring hoop and the prestressed tendon, and the local reinforcing devices are fixed on the hoop to form the device. The construction method comprises preparing a pedestal and coating isolation paint; binding a reinforcement cage, installing a spring hoop, penetrating a reinforcement bundle, and tensioning a prestressed rib; fixedly connecting the reinforcing rib with the prestressed rib and the spring band to form a local reinforcing device; binding the formed local integral structure on the stirrups through a plurality of iron wires to form an integral structure; pouring concrete, curing, releasing the prestressed reinforcing steel, demoulding and discharging. The device has simple structure and is beneficial to large-scale production; the expansion stress of the prestressed reinforcement can be effectively restrained, the expansion of the crack at the end part of the prestressed concrete is controlled, the effect is obvious, and the application prospect is good.
Description
Technical Field
The invention belongs to a building structure device, and particularly relates to a longitudinal cracking restraining device for a pretensioned prestressed concrete beam and a construction method thereof.
Background
The process flow of the pretensioned prestressed concrete construction generally comprises the steps of preparing a pedestal, brushing an isolating agent, laying prestressed tendons, tensioning, binding transverse tendons according to side molds, pouring concrete, maintaining, loosening the prestressed tendons, demolding, discharging from a groove and stacking. The end of the prestressed concrete beam can cause the end of the concrete to crack due to the shrinkage and radial expansion of the prestressed tendons after expansion, longitudinal cracks along the beam body can occur, the reinforcing steel bars of the beam body can be corroded and longitudinally split, and the safety of the bridge is endangered.
Therefore, it is necessary to design a longitudinal crack-inhibiting device for prestressed concrete to solve the above problems.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the longitudinal crack inhibiting device for the pretensioned prestressed concrete beam and the construction method thereof are simple in structure, low in cost and capable of effectively restraining the longitudinal crack expansion of the pretensioned prestressed concrete beam.
The technical scheme is as follows: a longitudinal cracking restraining device for a pretensioned prestressed concrete beam comprises pretensioned prestressed tendons, spring hoops, reinforcing ribs and hoops; the spring hoop is sleeved on the pretensioned prestressing tendon, the reinforcing rib is fixed on the stirrup, and the pretensioned prestressing tendon and the spring hoop are sleeved with a plurality of reinforcing ribs and stirrups.
Preferably, the reinforcing rib is a group of FRP composite material sheets or a group of steel bar net plates or a group of FRP composite material sheets and steel bar net plates.
Preferably, the steel mesh plate comprises a steel mesh and a pair of oval annular steel bars fixed to opposite sides of the steel mesh.
Preferably, the FRP composite sheet is square, one end of the FRP composite sheet is open, two ends adjacent to the open end are provided with deep notches, the notches are U-shaped notches, the opening of the U-shaped notch is communicated with the open end of the FRP composite sheet, and the bottom of the U-shaped notch extends to the other end opposite to the open end; the outer edges of the two U-shaped notches are provided with opposite connecting holes close to the opening, and a plurality of holes are formed in the flat plate between the two U-shaped notches.
Preferably, the group of FRP composite material thin plates are arranged up and down and connected at the opening end through iron wires.
Preferably, the device comprises a plurality of pairs of FRP composite material sheets, three pairs of pretensioned prestressing tendons and three pairs of spring hoops, wherein the spring hoops and the pretensioned prestressing tendons are fixedly connected to the bottoms of four U-shaped notches and the butt joints of two notches of each pair of FRP composite material sheets respectively.
Preferably, the length of the spring band is greater than the anchoring length of the pretensioned tendons.
In another embodiment of the present invention, a construction method of a longitudinal crack suppression device for a pretensioned prestressed concrete beam includes the steps of:
(1) preparing a pedestal, and coating isolation paint;
(2) binding a reinforcement cage, installing a spring hoop, and tensioning the reinforcement to form a pretensioned prestressing tendon; (3) fixedly connecting the reinforcing rib with the pretensioned prestressing tendon and the spring band to form a local integral structure;
(4) the formed local integral structure is bound on the stirrups through a plurality of iron wires to form the integral structure.
(5) Pouring concrete, curing, releasing the pretensioned prestressing tendons, demoulding and discharging.
Further, when the reinforcing ribs in the step (3) are FRP composite material sheets, symmetrically embedding the 2 FRP composite material sheets into the pretensioned prestressing ribs and the spring hoops from the side faces of the pretensioned prestressing ribs and the spring hoops through the notches, and binding and connecting through a plurality of connecting holes which penetrate through the sheets from top to bottom through iron wires to form a local whole;
and (3) when the reinforcing ribs are the reinforcing steel bar net plate in the step (3), respectively surrounding 2 steel wires on the pretensioned prestressed ribs of the upper flange and the lower flange to form an elliptical ring-shaped reinforcing steel bar, and binding the prefabricated steel wire mesh on the elliptical ring-shaped reinforcing steel bar through a plurality of iron wires to form a local whole.
Has the advantages that: compared with the prior art, the longitudinal cracking restraining device for the pretensioned prestressed concrete beam and the construction method thereof have the advantages that the device is simple in structure, the whole device is formed by connecting a plurality of parts through iron wires, construction is convenient, and large-scale production is facilitated; the device has more overall holes, does not influence the concrete integrity of the beam body, and has low material consumption and low cost; the design is flexible in engineering application, the sizes of the FRP composite material thin plate and the steel wire mesh and the sizes of holes can be adjusted at will according to the size of a structural test piece, the pouring of cement mortar is not influenced, the expansion stress of prestressed reinforcements can be restrained effectively, the expansion of cracks at the end part of prestressed concrete is controlled, the effect is obvious, and the use prospect is good.
Drawings
Fig. 1 is a schematic sectional view of a prestressed concrete girder according to example 1 of the present invention;
FIG. 2 is a schematic view of the installation of FRP composite sheet with spring band, pretensioned tendons and tendons;
FIG. 3 is a schematic view of two FRP composite sheets mounted with spring hoops, pretensioned tendons and stirrups;
FIG. 4 is a schematic view of a spring band construction;
FIG. 5 is a schematic view of a sheet structure of FRP composite material;
fig. 6 is a schematic sectional view of a prestressed concrete girder according to example 2 of the present invention;
FIG. 7 is a schematic view of the elliptical ring structure with spring band, pretensioned tendons and stirrup installation;
fig. 8 is a schematic view of a rebar grid structure;
fig. 9 is a schematic diagram of a steel wire mesh structure.
Detailed Description
The present invention is further illustrated by the following figures and specific examples, which are to be understood as illustrative only and not as limiting the scope of the invention, which is to be given the full breadth of the appended claims and any and all equivalent modifications thereof which may occur to those skilled in the art upon reading the present specification.
A longitudinal crack suppression device for a pretensioned prestressed concrete beam comprises a pretensioned prestressed rib 1, a spring hoop 2, a reinforcing rib and a hoop 3; the spring hoop is sleeved on the pretensioned prestressing tendon, the reinforcing rib is fixed on the stirrup, and the pretensioned prestressing tendon and the spring hoop are sleeved with a plurality of reinforcing ribs and stirrups. The reinforcing ribs are a group of FRP composite material thin plates 5 or a group of steel bar net plates or a group of FRP composite material thin plates and steel bar net plates. The steel bar net plate comprises a steel wire mesh 8 and a pair of elliptical ring-shaped steel bars fixed on opposite sides of the steel wire mesh.
Example 1:
as shown in fig. 1, a longitudinal crack-suppressing device for a pretensioned prestressed concrete beam includes a pretensioned prestressed tendon 1, a spring hoop 2, an FRP composite material sheet 5, and a stirrup 3. The spring hoop is sleeved on the pretensioned prestressing tendon, the FRP composite material sheet is sleeved on the spring hoop of the pretensioned prestressing tendon, and then the FRP composite material sheet is fixed on the hoop through an iron wire and fixed with the concrete beam 4.
The FRP composite material sheet comprises a plurality of groups, and each group is sleeved on the pretensioned prestressing tendons and the spring hoops at intervals to form a layered structure.
As shown in fig. 2 to 5, the FRP composite sheet is square, one end of the FRP composite sheet is open, two ends adjacent to the open end are provided with deep notches, the notches are U-shaped notches, the openings of the U-shaped notches are communicated with the open end of the composite sheet, and the bottoms of the U-shaped notches extend to the other end opposite to the open end. The outer edges of the two U-shaped notches are provided with opposite connecting holes close to the opening, and a plurality of large holes are formed in the flat plate between the two U-shaped notches.
The spring hoop is sleeved on the pretensioned prestressing tendon and is at a certain distance from the end of the pretensioned prestressing tendon, and the length of the spring hoop is slightly greater than the anchoring length of the pretensioned prestressing tendon. The U-shaped groove openings of the two FRP composite material thin plates are butted up and down, and iron wires 6 penetrate through the corresponding connecting holes to fixedly connect the upper FRP composite material thin plate and the lower FRP composite material thin plate. The bottom of each U-shaped notch is provided with a pretensioned prestressing tendon with a spring hoop, and the joint of the two U-shaped notches is provided with a pretensioned prestressing tendon with a spring hoop. The pretensioned prestressing tendons, the spring hoops, the FRP composite material thin plates and the hoops are connected through a plurality of iron wires.
Preferably, the longitudinal crack suppression device for the pretensioned prestressed concrete beam adopts the spring hoop, and the spring hoop is sleeved on the pretensioned prestressed tendon, and the length of the spring hoop is slightly greater than the anchoring length of the pretensioned prestressed tendon, so that the expansion of the micro cracks at the end part of the concrete beam caused by the expansion force of the pretensioned prestressed tendon is effectively restrained. Secondly, the thin plate in the device is made of FRP composite materials which have the characteristics of light weight, hardness, high mechanical strength, corrosion resistance and the like. Not only can the cracking of prestressed concrete beam tip effectively controlled, can use in acid, alkali, chlorine salt and humid environment for a long time moreover, improve the life of structure, FRP belongs to artifical material moreover, can adopt different structural shape according to the engineering needs, and the design is nimble, construction convenience. The upper end and the lower end of the FRP composite material sheet are provided with deep notches, so that the FRP composite material sheet can be installed from the side surface of the prestressed tendon by the early tensioning method, and the construction is convenient.
During installation: the spring hoop is installed at a certain distance at the end part of the steel bar, then the steel bar is tensioned to form a pre-tensioning prestressed rib, the FRP composite material thin plate is provided with a notch and a hole, the pre-tensioning prestressed rib and the spring hoop are symmetrically installed on the side face, 2 FRP composite material thin plates are tightly connected through iron wires, and finally the FRP composite material thin plate is bound on the stirrup through a plurality of iron wires to form an integral structure.
Example 2:
as shown in fig. 6 to 9, a longitudinal crack-suppressing apparatus for a pretensioned prestressed concrete beam includes a pretensioned prestressed tendon 1, a spring band 2, a net sheet of steel reinforcement, and a stirrup 3. The spring hoop is sleeved on the pretensioned prestressing tendons, the steel bar mesh plate comprises a steel wire mesh 8 and an elliptical annular steel bar 7, and the pretensioned prestressing tendons are fixed at two ends and in the middle of the elliptical annular steel bar respectively. The prefabricated steel wire mesh is connected to the elliptical ring-shaped steel bar through an iron wire in a binding mode and then fixed to the stirrup through the iron wire.
The steel bar net plate comprises a plurality of groups, and each group is sleeved on the pretensioned prestressing tendons and the spring hoops at intervals to form a layered structure.
During installation: after the reinforcement cage is formed, 2 steel wires are respectively bound with the pretensioned prestressing tendons of the upper flange and the lower flange to form an elliptical annular reinforcement, a prefabricated steel wire mesh is placed in the middle of the steel wire mesh, the steel wire mesh is bound and connected with the elliptical annular reinforcement through a plurality of steel wires, and finally the steel wire mesh is bound on the stirrups through a plurality of steel wires to form an integral structure.
Wherein, the steel wire material is thin and soft, can form different shapes according to the engineering requirement, and the construction is convenient. And secondly, the steel wire material has good plasticity and tensile strength, so that the expansion of micro cracks at the beam end can be effectively restrained, longitudinal cracks are generated, and the bearing capacity of the structure can be improved to a certain degree.
Preferably, the longitudinal crack suppression device for the two pretensioned prestressed concrete beams can combine the FRP composite material thin plate and the steel wire mesh, combine the advantages of the FRP composite material and the steel wire mesh, and can also be used as a protection device.
The device not only can effectively restrain the development of the micro-cracks at the end part of the pretensioned prestressed concrete, but also is convenient to construct. Because the expansion force of the end part of the pretensioned prestressed tendon is larger in a certain range, the spring hoops are arranged around the pretensioned prestressed tendon, and the length of the spring hoops is slightly larger than the anchoring length of the pretensioned prestressed tendon, so that the expansion of the micro-cracks at the end part of the prestressed concrete beam caused by the expansion force of the pretensioned prestressed tendon is effectively controlled. All be equipped with great hole in the middle of FRP combined material sheet metal and the reinforcing bar net like this both save material, when pouring concrete, can not lead to the jam of cement mortar and form that the beam-ends portion is mostly fine aggregate, reduces the quality of roof beam moreover. The FRP composite material thin plate and the steel bar net plate of the two devices are all installed close to the stirrups, are bound and connected with the stirrups through a plurality of iron wires to form an integral structure, prevent the problems that the reinforcing effect is poor and the like due to the separation of cement mortar and a framework in the process of pouring concrete, and are convenient to construct and operate.
The construction method of the longitudinal cracking suppression device for the pretensioned prestressed concrete beam comprises the following steps:
(1) preparing a pedestal, and coating isolation paint;
(2) binding a reinforcement cage, installing a spring hoop, and tensioning the reinforcement to form a pretensioned prestressing tendon;
(3) fixedly connecting the reinforcing ribs with the pretensioned prestressing tendons and the spring hoops, and finally binding the reinforcing ribs with the hoops by using iron wires to form a local integral structure;
when the reinforcing ribs are FRP composite material sheets, the 2 FRP composite material sheets are symmetrically embedded into the pretensioned prestressing tendons and the spring hoop from the side faces of the pretensioned prestressing tendons and the spring hoop through notches, and are bound and connected through a plurality of connecting holes which penetrate through the sheet from top to bottom through iron wires to form a local whole;
when the reinforcing ribs are the reinforcing steel bar mesh plate, 2 steel wires are respectively wound on the pretensioned prestressed ribs on the upper flange and the lower flange to form an elliptical ring-shaped reinforcing steel bar, and the prefabricated steel wire mesh is bound on the elliptical ring-shaped reinforcing steel bar through a plurality of steel wires to form a local whole. The prestressed tendons on the upper side of the concrete section are called upper flange prestressed tendons, and the prestressed tendons on the lower side of the concrete section are called lower flange prestressed tendons.
(4) The formed local integral structure is bound on the stirrups through a plurality of iron wires to form the integral structure.
(5) Pouring concrete, curing, releasing the pretensioned prestressing tendons, demoulding and discharging. The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the spirit and scope of the invention.
Claims (3)
1. The utility model provides a longitudinal cracking suppression device of pretensioning method prestressed concrete roof beam which characterized in that: the device comprises a pretensioned prestressing tendon (1), a spring hoop (2), a reinforcing rib and a hoop (3); the spring hoop is sleeved on the pretensioned prestressing tendon, the reinforcing rib is fixed on the stirrup, and the pretensioned prestressing tendon and the spring hoop are sleeved with a plurality of reinforcing ribs and stirrups;
the reinforcing ribs are a group of FRP composite material sheets (5) or a group of FRP composite material sheets and a reinforcing steel bar net plate;
the steel bar net plate comprises a steel wire mesh (8) and a pair of elliptical ring-shaped steel bars (7) fixed on the opposite sides of the steel wire mesh;
the FRP composite material thin plate is square, one end of the FRP composite material thin plate is open, two ends adjacent to the open end are provided with deep notches, the notches are U-shaped notches, the openings of the U-shaped notches are communicated with the open end of the FRP composite material thin plate, and the bottoms of the U-shaped notches extend to the other end opposite to the open end; opposite connecting holes are formed in the outer edges of the two U-shaped notches close to the opening, and a plurality of holes are formed in the flat plate between the two U-shaped notches;
the group of FRP composite material thin plates are arranged up and down and connected at the opening end through an iron wire (6);
the device comprises a plurality of groups of FRP composite material thin plates, three pairs of pretensioning prestressed ribs and three pairs of spring hoops, wherein the spring hoops and the pretensioning prestressed ribs are respectively and fixedly connected with the bottoms of four U-shaped notches and the butt joints of two notches of each group of FRP composite material thin plates.
2. The longitudinal crack-suppressing device for a pretensioned prestressed concrete beam according to claim 1, wherein: the length of the spring hoop is greater than the anchoring length of the pretensioned prestressing tendons.
3. A method of constructing a device for suppressing longitudinal cracking of pretensioned prestressed concrete according to any of claims 1 to 2, comprising the steps of:
(1) preparing a pedestal, and coating isolation paint;
(2) binding a reinforcement cage, installing a spring hoop, and tensioning the reinforcement to form a pretensioned prestressing tendon;
(3) fixedly connecting the reinforcing rib with the pretensioned prestressing tendon and the spring band to form a local integral structure; when the reinforcing ribs are FRP composite material sheets, the 2 FRP composite material sheets are symmetrically embedded into the pretensioned prestressing tendons and the spring hoop from the side faces of the pretensioned prestressing tendons and the spring hoop through the notches, and are bound and connected through a plurality of connecting holes which penetrate through the sheet from top to bottom through iron wires to form a local whole;
when the reinforcing ribs are the reinforcing steel bar net plate, 2 steel wires are respectively wound on the pretensioned prestressed ribs of the upper flange and the lower flange to form an elliptical annular reinforcing steel bar, and the prefabricated steel wire mesh is bound on the elliptical annular reinforcing steel bar through a plurality of steel wires to form a local whole;
(4) the formed local integral structure is bound on the stirrups through a plurality of iron wires to form the integral structure.
(5) Pouring concrete, curing, releasing the pretensioned prestressing tendons, demoulding and discharging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810233078.6A CN108532835B (en) | 2018-03-21 | 2018-03-21 | Longitudinal cracking restraining device for pre-tensioned prestressed concrete beam and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810233078.6A CN108532835B (en) | 2018-03-21 | 2018-03-21 | Longitudinal cracking restraining device for pre-tensioned prestressed concrete beam and construction method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108532835A CN108532835A (en) | 2018-09-14 |
| CN108532835B true CN108532835B (en) | 2021-04-27 |
Family
ID=63484394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810233078.6A Active CN108532835B (en) | 2018-03-21 | 2018-03-21 | Longitudinal cracking restraining device for pre-tensioned prestressed concrete beam and construction method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108532835B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2453907A1 (en) * | 1974-11-14 | 1976-05-26 | Bonatz Peter Prof Dr Ing | Concrete beam reinforcing element - with bottom horizontal cross rods bent round to spatial separator meshes |
| JPH05171807A (en) * | 1991-12-24 | 1993-07-09 | Taisei Corp | Assembling method of underground-girder reinforcement |
| CN101403212A (en) * | 2008-11-13 | 2009-04-08 | 中铁二局股份有限公司 | Construction method for pretensioned prestressing concrete simply supported T-beam |
| CN201695562U (en) * | 2010-06-21 | 2011-01-05 | 西安建筑科技大学 | Novel FRP composite rebar concrete slab |
| CN102296752A (en) * | 2011-06-09 | 2011-12-28 | 北京工业大学 | Galvanized welded steel wire mesh beam end structure and method for improving ductility of beam end bottom pressure zone |
| CN102418402A (en) * | 2010-09-28 | 2012-04-18 | 杨峰 | Pre-tensioned prestressed reinforced concrete precast beam |
| CN103088962A (en) * | 2012-08-16 | 2013-05-08 | 杨众 | Prestressed reinforced concrete precast beam based on pre-tensioning method |
| CN203905293U (en) * | 2014-04-22 | 2014-10-29 | 杨众 | Overhead weighbridge prestress prefabricate beam |
| CN204551219U (en) * | 2015-04-08 | 2015-08-12 | 福州大学 | The stage transverse prestress structure of oblique hinged precast hollow slab beam bridge |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107313552A (en) * | 2016-04-26 | 2017-11-03 | 辽宁工业大学 | A kind of FRP plate-concrete combination beam |
-
2018
- 2018-03-21 CN CN201810233078.6A patent/CN108532835B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2453907A1 (en) * | 1974-11-14 | 1976-05-26 | Bonatz Peter Prof Dr Ing | Concrete beam reinforcing element - with bottom horizontal cross rods bent round to spatial separator meshes |
| JPH05171807A (en) * | 1991-12-24 | 1993-07-09 | Taisei Corp | Assembling method of underground-girder reinforcement |
| CN101403212A (en) * | 2008-11-13 | 2009-04-08 | 中铁二局股份有限公司 | Construction method for pretensioned prestressing concrete simply supported T-beam |
| CN201695562U (en) * | 2010-06-21 | 2011-01-05 | 西安建筑科技大学 | Novel FRP composite rebar concrete slab |
| CN102418402A (en) * | 2010-09-28 | 2012-04-18 | 杨峰 | Pre-tensioned prestressed reinforced concrete precast beam |
| CN102296752A (en) * | 2011-06-09 | 2011-12-28 | 北京工业大学 | Galvanized welded steel wire mesh beam end structure and method for improving ductility of beam end bottom pressure zone |
| CN103088962A (en) * | 2012-08-16 | 2013-05-08 | 杨众 | Prestressed reinforced concrete precast beam based on pre-tensioning method |
| CN203905293U (en) * | 2014-04-22 | 2014-10-29 | 杨众 | Overhead weighbridge prestress prefabricate beam |
| CN204551219U (en) * | 2015-04-08 | 2015-08-12 | 福州大学 | The stage transverse prestress structure of oblique hinged precast hollow slab beam bridge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108532835A (en) | 2018-09-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4040980B2 (en) | Prestressed synthetic truss girder and manufacturing method thereof | |
| CN109339828B (en) | Tunnel prestress inverted arch structure and construction method thereof | |
| CN110206143B (en) | Construction method of post-tensioning prestressed assembly concrete frame structure | |
| RU2736929C1 (en) | Foldable fixed formwork from fabric reinforced concrete (frc) of prefabricated type and method of manufacturing thereof | |
| WO2011007990A2 (en) | Steel box girder bridge and method for constructing same | |
| KR101021854B1 (en) | Half precast composite slab and this production technique | |
| CN109057148A (en) | Ultra-high performance concrete is without regular reinforcement Prestressed U type beam and its construction method | |
| CN110004816B (en) | Corrugated steel web prestress UHPC combined box girder and construction method thereof | |
| CN214531150U (en) | Novel connection structure of superimposed sheet and cast-in-place roof beam | |
| CN104652430A (en) | Composite reinforcement partially prestressed concrete solid square pile and manufacturing method thereof | |
| CN104563103A (en) | Composite-reinforcement partially-prestressed concrete solid square pile and production method thereof | |
| KR101240581B1 (en) | End support apparatus using cross- shaped tendon anchorage plate, prestressed concrete beam, and construction method using the same | |
| AU2019101278A4 (en) | Prefabricated high-strength concrete combined pier structure and construction method thereof | |
| CN108532835B (en) | Longitudinal cracking restraining device for pre-tensioned prestressed concrete beam and construction method thereof | |
| CN110107019B (en) | Composite prefabricated floor slab for prefabricated building | |
| CN110409282B (en) | Non-web-rib prestressed self-maintenance composite beam based on permanent post-tensioned prestressed UHPC (ultra high performance concrete) nested template and construction method | |
| CN108824191B (en) | Construction process of group nail connecting device with corrugated sleeve | |
| CN105178165A (en) | Tension face layer compound-reinforced reinforced concrete continuous rigid frame bridge and construction method thereof | |
| CN113585620B (en) | Prestressed double-web steel reinforced concrete beam | |
| CN212530853U (en) | Reinforced structure of silo of cement plant | |
| CN206053123U (en) | A kind of civil air defense constructions and installations groove type plate of built-in retarded adhesive prestressed steel bar | |
| CN109610349B (en) | PC box girder web plate reinforcing structure with built-in obliquely-woven mesh and method | |
| CN112942659A (en) | Recycled concrete laminated slab containing prestressed FRP tendon fiber and manufacturing method thereof | |
| CN114033101A (en) | Full FRP (fiber reinforced plastic) rib reinforced seawater sea sand concrete high-ductility beam and application thereof | |
| CN209244093U (en) | Ultra-high performance concrete is without regular reinforcement Prestressed U type beam |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |