CN110700618B

CN110700618B - Building prestress reinforcement construction method

Info

Publication number: CN110700618B
Application number: CN201911029639.1A
Authority: CN
Inventors: 韩松; 李文刚; 王元富; 陈耀井; 刘汉有; 戴邵雷; 谭成
Original assignee: Shanghai Horse Construction Co ltd
Current assignee: Shanghai Horse Construction Co ltd
Priority date: 2019-10-28
Filing date: 2019-10-28
Publication date: 2021-10-01
Anticipated expiration: 2039-10-28
Also published as: CN110700618A

Abstract

The invention discloses a construction method for building prestress reinforcement, which comprises the following steps: (1) mounting a prestressed carbon fiber tensioning device on the surface of a building structure, and pre-tensioning a tensioning cable; (2) coating adhesive cement on the surface of the concrete structure and sticking a passive stress tensioning reinforcing member; (3) after the adhesive cement is solidified and the tensile force of the tensile cable is unloaded, the adhesive cement is coated on the tensile cable and the tensile cable is formally tensioned. By adopting the technical scheme, the construction method for building prestress reinforcement completes the tension of the passive stress tension reinforcement member by tensioning the prestress carbon fiber tension cable, so that the construction process is simplified, the construction preparation and installation time is saved, and the purpose of saving the construction period is achieved.

Description

Building prestress reinforcement construction method

Technical Field

The invention relates to a construction method for building prestress reinforcement, belonging to the technical field of building construction.

Background

With the development of construction industry, the prestress technology is widely applied. The fiber composite material has gradually become a trend to replace reinforcing steel bars as tension members in reinforcement due to high strength and corrosion resistance, and the prestressed concrete technology can effectively delay and inhibit the occurrence of concrete structure cracks. Concrete reinforcement methods can be divided into two categories: an active reinforcement mode and a passive reinforcement mode. The conventional reinforcing modes of the fiber composite material, namely the carbon fiber cloth and the carbon fiber plate belong to passive reinforcement, and the prestressed carbon fiber plate is actively reinforced. The active reinforcement method has the outstanding advantage that the utilization rate of materials can be effectively improved. The tensile strength of the carbon fiber plate is far higher than that of concrete and reinforcing steel bars, so that the carbon fiber plate deforms greatly when exerting the strength of the carbon fiber plate, when the reinforcing steel bars yield or the concrete is damaged, the strength of the carbon fiber plate is not fully exerted, the strength of the carbon fiber plate can be exerted in advance by the prestressed carbon fiber plate, the utilization rate is greatly improved, the deflection deformation of the structure can be reduced while the strength and the rigidity of the structure are effectively increased, and cracks can be reduced and sealed. The conventional passive reinforcement method only plays a role in reinforcement after the load borne by the original component is increased, and the active reinforcement is like a prestressed tendon in a prestressed concrete system, so that the force can be actively applied to the original component, and the working state of the original structure is changed to achieve the purpose of reinforcement.

The common prestressed carbon fiber tensioning device comprises a fixed end base, a tensioning end base, a fixed end anchor block, a tensioning end anchor block and a carbon fiber tensioning cable, wherein the tensioning cable can be divided into a carbon fiber plate and carbon fiber cloth according to different forms, and can be in a strip shape, a strip shape or a column shape. When reinforcing, firstly, the tension cable must be pre-tensioned, the tension force is unloaded after pre-tensioning is finished, and then the tension cable is coated with a glue layer for formal tensioning. The pretensioning is a process of system balance and stability, the stress concentration points in the whole system are dissipated by graded pretensioning, the waste of a glue layer and interface pollution caused by sudden failure in formal gluing and tensioning are avoided, and the pretensioning device also has the effect of testing a reinforcing device, and is prevented from being damaged and difficult to process in formal tensioning after gluing.

Because the pre-tensioned tension force is unloaded finally, if the pre-tensioned tension force is applied to other common carbon fiber cloth or carbon fiber plates which are stuck to the surface of the concrete in a passive reinforcement mode, the common carbon fiber cloth or carbon fiber plates can have prestress, and the method is a method for better converting the carbon fiber material in the passive reinforcement mode into the carbon fiber material in the active reinforcement mode.

Disclosure of Invention

Therefore, an object of the present invention is to provide a construction method for prestressed reinforcement of a building, which can convert a carbon fiber material from a passive reinforcement method to an active reinforcement method.

In order to achieve the purpose, the construction method for building prestress reinforcement comprises the following steps: the method comprises the following steps that (1) a prestress carbon fiber tensioning device is installed on the surface of a building structure, and a tensioning cable is pretensioned; (2) coating adhesive cement on the surface of a building structure and sticking a passive stress tensioning reinforcing member; (3) and after the adhesive cement is solidified, unloading the tensile force of the tensile cable, coating the adhesive cement on the tensile cable and performing formal tension on the tensile cable.

The stretching cable comprises a plurality of stretching wires which are distributed in parallel.

And in the step 3, after the mucilage is solidified, unloading the tensile force of part of the tensile cables in batches, coating the mucilage on the tensile cables with the unloaded tensile force, and then performing formal tensioning until all the tensile cables are tensioned formally.

The passive stress tensioning and reinforcing members are multiple and are arranged at intervals with the tensioning cables.

The building structure includes a building flexural or compression member for bearing load forces during use.

In the step 1, the stress state of the member is adjusted by pre-tensioning the tension cable, so that the member deforms in the direction opposite to the load acting force.

The formal tension amplitude of the tension cable is 40-60% of the design tension amount; the pre-tensioning amplitude is 120-150% of the design tensioning amount.

The building comprises a concrete structure building, a steel frame structure building, a wood structure building or a stone structure building.

The passive stress tensioning and reinforcing member comprises carbon fiber cloth, a carbon fiber plate or bonded steel.

By adopting the technical scheme, the construction method for building prestress reinforcement completes the tensioning of the common passive stress tensioning reinforcement member by tensioning the prestress carbon fiber tensioning cable, so that the construction process is simplified, the construction preparation and installation time is saved, and the purpose of saving the construction period is achieved.

Drawings

Fig. 1 is a schematic distribution diagram of a tension cable and a passive stress tension reinforcement member in an embodiment of a construction method for building prestress reinforcement according to the present invention.

Fig. 2 is a schematic diagram of step 1 of applying the building prestress reinforcement construction method to the reverse arch construction of a building flexural member.

Fig. 3 is a schematic view of step 2 of the reverse arch construction.

Fig. 4 is a schematic view of step 4 of the reverse arch construction.

Detailed Description

The invention is described in further detail below with reference to the figures and the detailed description.

The invention relates to a construction method for building prestress reinforcement, which comprises the following steps: (1) mounting a prestressed carbon fiber tensioning device on the surface of a building structure, and pre-tensioning a tensioning cable; (2) coating adhesive cement on the surface of a building structure and sticking a passive stress tensioning reinforcing member; (3) and after the adhesive cement is solidified, unloading the tensile force of the tensile cable, coating the adhesive cement on the tensile cable and performing formal tension on the tensile cable. The buildings include concrete structure buildings, steel frame structure buildings, wood structure buildings or stone structure buildings. The passive stress tensioning reinforcing member comprises carbon fiber cloth, a carbon fiber plate or bonded steel and the like.

And the tensioning cable of each specification has a corresponding limit tensioning amount. In the long-term use process of the prestressed carbon fiber tension cable, in order to reserve enough safety margin, the allowable design tension amount of the tension cable is only 40% -60% of the limit tension amount, but the tension amount can temporarily reach about 80% of the limit tension amount under the construction working condition. Therefore, by pre-tensioning the prestressed carbon fiber tensioning cable, the pre-tensioning amplitude is 120% -150% of the designed tensioning amount, the building structure can be stressed and deformed, a common passive stress tensioning reinforcing member is adhered in a deformed state, after the mortar is solidified, the tensioning force of the tensioning cable is unloaded, the stress generated by the pre-tensioning on the building structure can be transferred to the adhered common passive stress tensioning reinforcing member, so that the common passive stress tensioning reinforcing member also has the tensioning effect, then the tensioning cable is formally tensioned, the formally tensioned tensioning amount is 40% -60% of the designed tensioning amount, therefore, the tensioning effect of the tensioning cable and the adhered passive stress tensioning reinforcing member can be realized by only tensioning the tensioning cable, the construction process is simplified, the construction preparation and the installation time can be saved, the purpose of saving the construction period is achieved.

As shown in fig. 1, the tension cable 1 includes a plurality of cables which are distributed in parallel; the passive stress tensioning and reinforcing member 2 is provided in plurality and is arranged at an interval with the tensioning cable 1.

In the step 3, after the mortar is solidified, unloading the tensile force of all the tensile cables may cause the passive stress tensioning reinforcing member to be separated from the surface of the building due to the overlarge stress applied to the passive stress tensioning reinforcing member, so that the tensile force of part of the tensile cables, for example, one or more of the tensile cables, can be unloaded in batches, the mortar is coated on the tensile cables from which the tensile force is unloaded, and then the formal tensioning is performed, and then the operations are repeated on the other tensile cables until the formal tensioning is completed for all the tensile cables.

When the building structure comprises the building bending member 100 for bearing the load acting force during the use, as shown in fig. 2, in the step 1, the stress state of the building bending member 100 is adjusted by pre-tensioning the tension cable 1, so that the building bending member deforms in the direction opposite to the load acting force. As shown in fig. 3, a mortar is applied to the surface of the building structure 100 and the passive stress tension reinforcement member 2 is attached. As shown in fig. 4, after the cement is solidified, the tensile force of the tension cable 1 is unloaded, the cement is coated on the tension cable 1, and the tension cable is formally tensioned. The prestress tension and the reverse arch deformation can exceed the design strength limit value of the practical use of the reinforcing material under the construction working condition of limited conditions.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. The construction method for building prestress reinforcement is characterized by comprising the following steps of:

(1) mounting a prestressed carbon fiber tensioning device on the surface of a building structure, and pre-tensioning a tensioning cable;

(2) coating adhesive cement on the surface of a building structure and sticking a passive stress tensioning reinforcing member;

(3) after the adhesive cement is solidified, unloading the tensile force of the tensile cable, coating the adhesive cement on the tensile cable and performing formal tension on the tensile cable;

the tensioning cables comprise a plurality of tensioning cables which are distributed in parallel;

in the step 3, after the adhesive cement is solidified, the tension of part of the tension cables, namely one or more of the tension cables, is unloaded in batches, the tension cables with the tension removed are coated with the adhesive cement and then are tensioned formally, and then the operations are repeated on other tension cables until all tension cables are tensioned formally.

2. The building prestress reinforcement construction method according to claim 1, characterized in that: the passive stress tensioning and reinforcing members are multiple and are arranged at intervals with the tensioning cables.

3. The building prestress reinforcement construction method according to any one of claims 1 to 2, wherein: the building structure includes a building flexural or compression member for bearing load forces during use.

4. The building prestress reinforcement construction method according to claim 3, wherein: in the step 1, the stress state of the member is adjusted by pre-tensioning the tension cable, so that the member deforms in the direction opposite to the load acting force.

5. The building prestress reinforcement construction method according to any one of claims 1 to 2, wherein: the formal tension amplitude of the tension cable is 40-60% of the design tension amount; the pre-tensioning amplitude is 120-150% of the design tensioning amount.

6. The building prestress reinforcement construction method according to any one of claims 1 to 2, wherein: the building comprises a concrete structure building, a steel frame structure building, a wood structure building or a stone structure building.

7. The building prestress reinforcement construction method according to any one of claims 1 to 2, wherein: the passive stress tensioning and reinforcing member comprises carbon fiber cloth, a carbon fiber plate or bonded steel.