CN214312353U

CN214312353U - Box girder model for verifying adaptability of prestressed duct grouting material

Info

Publication number: CN214312353U
Application number: CN202023019640.7U
Authority: CN
Inventors: 舒本安; 杨腾宇; 李永铃; 邱冰; 郭立贤; 马云龙; 孙韬; 邱文俊; 李白云; 李林琛; 焦元
Original assignee: Foshan Communications Technology Co ltd
Current assignee: Foshan Communications Technology Co ltd
Priority date: 2020-12-14
Filing date: 2020-12-14
Publication date: 2021-09-28
Anticipated expiration: 2030-12-14

Abstract

The utility model discloses a case roof beam model for verifying prestressed duct mud jacking adaptability, including case roof beam model body, reinforcing bar, bellows and steel strand wires, the reinforcing bar passes through the ligature and forms steel reinforcement framework, steel reinforcement framework fixes this is internal for the case roof beam model, the bellows passes through the ligature to be fixed in the steel reinforcement framework, case roof beam model body is pour by the structural material of hardening that can condense and is formed, steel strand wires penetrate in the bellows. The utility model discloses can press the environment that thick liquids were located in the low-cost simulation entity case roof beam to verify novel thick liquids performance.

Description

Box girder model for verifying adaptability of prestressed duct grouting material

Technical Field

The utility model relates to a novel pressure slurry's capability test device technical field especially relates to a case beam model for verifying prestressing force pore canal pressure slurry adaptability.

Background

In the existing building engineering, the prestressed duct grouting material is usually poured into a corrugated pipe in a prestressed box girder, and not only plays a role in connecting prestressed tendons and girder body concrete, but also plays a role in protecting the prestressed tendons. Novel pressure thick liquids there is great difference in the environment of environment and the actual prestressing force case roof beam in the bellows that the performance test experimentation was located, the performance that the experiment was surveyed is unlikely exactly the performance of reality, about 50 ten thousand yuan of 30 meters C60 concrete case roof beam cost now, if directly pour into the pressure thick liquids that have a problem into the entity case roof beam, the adaptability of pressure thick liquids in the bellows is relatively poor, can lead to inside filling degree that appears of bellows not up to standard, pressure thick liquids bleeding, produce defect problems such as a large amount of gas pockets, finally make whole piece roof beam inefficacy abandonment, cause huge economic loss.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a case roof beam model for verifying prestressing force pore canal mud jacking material adaptability is provided, the environment that the mud jacking material was located in can simulation entity case roof beam with the low cost to verify novel mud jacking material performance.

In order to solve the technical problem, the utility model provides a box girder model for verifying adaptability of prestressed duct grouting material, which comprises a box girder model body, reinforcing steel bars, corrugated pipes and steel stranded wires; the reinforcing bar passes through the ligature and forms framework of steel reinforcement, framework of steel reinforcement is fixed this is internal to the case roof beam model, the bellows passes through the ligature to be fixed in the framework of steel reinforcement, the formation is pour by the structural material that can condense the sclerosis to the case roof beam model body, steel strand wires penetrate in the bellows.

Further, the corrugated pipe comprises a first corrugated pipe and a second corrugated pipe, one end of the first corrugated pipe is bent downwards, the other end of the first corrugated pipe is bent upwards, and two ends of the second corrugated pipe are bent upwards.

Further, the first corrugated pipe is S-shaped, and the second corrugated pipe is concave arc-shaped.

Further, the corrugated pipe is a plastic pipe or a metal pipe.

Furthermore, the steel reinforcement framework comprises an upper through long rib, a lower through long rib and stirrups, the stirrups are rectangular, four sides of the stirrups are perpendicular to the upper through long rib and the lower through long rib, and the upper side and the lower side of the stirrups are respectively bound and connected with the upper through long rib and the lower through long rib.

Furthermore, the number of the upper through long ribs is more than three, the number of the lower through long ribs is consistent with that of the upper through long ribs, and the number of the stirrups is more than three.

Further, when the length of the steel strand is greater than or equal to 400mm, the maximum force total elongation of the steel strand is greater than or equal to 3.5%; when the initial load of the steel strand is 70% of the actual maximum force of the steel strand, the 1000-hour stress relaxation rate of the steel strand is less than or equal to 2.5%; and when the initial load of the steel strand is 80% of the actual maximum force of the steel strand, the 1000-hour stress relaxation rate of the steel strand is less than or equal to 4.5%.

Furthermore, the diameter of the corrugated pipe is 5-10 cm, the diameter of the steel bar is 8-20 mm, and the length of the steel strand is greater than or equal to that of the corrugated pipe.

Further, the structural material capable of setting and hardening is concrete or cement mortar.

Further, the box girder model is a cuboid, the length of the box girder model is more than 3 meters, the width of the box girder model is more than 50 centimeters, and the height of the box girder model is more than 60 centimeters.

Implement the utility model discloses, can press the environment that thick liquids were located in the low-cost simulation entity case roof beam:

the reinforcing bar passes through the ligature and forms framework of steel reinforcement, framework of steel reinforcement fixes this is internal for the case roof beam model, the bellows passes through the ligature to be fixed in the framework of steel reinforcement, the case roof beam model body is pour by the structural material that can condense the sclerosis and forms, steel strand wires penetrate in the bellows, and then realize making the model that can simulate entity case roof beam with the low cost.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings. It is only noted that the invention is intended to be limited to the specific forms set forth herein, including any reference to the drawings, as well as any other specific forms of embodiments of the invention.

Referring to fig. 1, the utility model provides a box girder model for verifying adaptability of prestressed duct grouting material, which comprises a box girder model body 1, reinforcing steel bars 2, a corrugated pipe 3 and steel strands 4; the reinforcing steel bar 2 forms a reinforcing steel bar framework through binding, the reinforcing steel bar framework is fixed in the box girder model body 1, the corrugated pipe 3 is fixed in the reinforcing steel bar framework through binding, the box girder model body 1 is formed by pouring structural materials capable of condensing and hardening, the steel strand 4 penetrates into the corrugated pipe 3, and then the model capable of simulating the solid box girder is manufactured with low cost.

The bellows 3 includes a first bellows 31 and a second bellows 32, the first bellows 31 having one end bent downward and the other end bent upward, and the second bellows 32 having both ends bent upward. The first bellows 31 has an S-shape, and the second bellows 32 has a concave arc shape. The shape of the two corrugated pipes 3 fully considers the arrangement characteristics of prestressed corrugated pipes in the box girder in actual engineering, the downward arc part of the first corrugated pipe 31 can simulate the corrugated pipe at the hogging moment area in a cast-in-place girder, and the second corrugated pipe 32 can simulate the corrugated pipe in a prefabricated small box girder. The corrugated pipe 3 is a plastic pipe or a metal pipe, and the diameter of the corrugated pipe 3 is 5-10 cm and is consistent with that of a corrugated pipe used in actual engineering.

In order to simulate the steel reinforcement framework in the actual engineering, also avoid simultaneously the steel reinforcement framework takes place deformation and leads to when pouring 3 shapes of bellows change, steel reinforcement framework is led to the length muscle, the length muscle is led to in the lower part by the upper portion that quantity is more than three and the stirrup is constituteed, the stirrup is the rectangle, the four sides of stirrup all with the length muscle is led to in the upper portion with the length muscle is led to in the lower part is perpendicular, the upper and lower both sides of stirrup respectively with the length muscle is led to in the upper portion with the length muscle is led to in the lower part ligature connection, and then forms firm steel reinforcement framework.

The diameter of the steel bar 2 is 8-20 mm, and preferably, the steel bar 2 meets the requirements of a steel bar bending and reverse bending test method for reinforced concrete YB/T5126-2003, and the quality of the steel bar 2 is ensured under the condition of further reducing the cost through bending and reverse bending tests.

In order to meet the requirements in the Standard GB/T5224-2014 for prestressed concrete, when the length of the steel strand is greater than or equal to 400mm, the maximum force total elongation of the steel strand is greater than or equal to 3.5 percent; when the initial load of the steel strand is 70% of the actual maximum force of the steel strand, the 1000-hour stress relaxation rate of the steel strand is less than or equal to 2.5%; and when the initial load of the steel strand is 80% of the actual maximum force of the steel strand, the 1000-hour stress relaxation rate of the steel strand is less than or equal to 4.5%.

Preferably, the steel strand 4 is selected from one of the specification requirements of multi-wire large-diameter high-strength low-relaxation prestressed steel strand YB/T4428-2014, bridge finished prestressed steel strand JT/T861 2013, unbonded prestressed steel strand JG/T161 2016 and the like, and is consistent with the steel strand used in the actual engineering. The length of the steel strand 4 is greater than or equal to the length of the corrugated pipe 3, and is consistent with that in the actual engineering.

The box girder model is a cuboid, the length of the box girder model is greater than 3 meters, the width of the box girder model is greater than 50 centimeters, the height of the box girder model is greater than 60 centimeters, the internal structure of the box girder model is similar to that of a solid box girder, and the specific size of the box girder model can be selected according to actual needs. In order to further reduce the manufacturing costs without affecting the test, the settable hardening structural material is not limited to concrete, but cement mortar or other air-setting/hydraulic binders may be selected.

To sum up, adopt the utility model discloses but the environment that the thick liquids were located in the low-cost simulation entity case roof beam to verify the adaptability of novel thick liquids in the entity case roof beam, avoid the huge economic loss that leads to because of the entity case roof beam inefficacy that the adaptability problem caused.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications and decorations can be made without departing from the principle of the invention, and these modifications and decorations are also regarded as the protection scope of the present invention.

Claims

1. A box girder model for verifying adaptability of prestressed duct grouting material is characterized by comprising a box girder model body, a steel bar, a corrugated pipe and a steel strand;

the reinforcing bar passes through the ligature and forms framework of steel reinforcement, framework of steel reinforcement is fixed this is internal to the case roof beam model, the bellows passes through the ligature to be fixed in the framework of steel reinforcement, the formation is pour by the structural material that can condense the sclerosis to the case roof beam model body, steel strand wires penetrate in the bellows.

2. A box beam model according to claim 1, wherein the bellows comprises a first bellows and a second bellows, one end of the first bellows is bent downward and the other end is bent upward, and both ends of the second bellows are bent upward.

3. A box beam model according to claim 2 wherein the first bellows is S-shaped and the second bellows is concave arcuate.

4. A box girder model according to claim 3 wherein the corrugated pipe is a plastic pipe or a metal pipe.

5. The box girder model of claim 1, wherein the steel reinforcement framework comprises an upper through long rib, a lower through long rib and a stirrup, the stirrup is rectangular, four sides of the stirrup are perpendicular to the upper through long rib and the lower through long rib, and the upper side and the lower side of the stirrup are respectively connected with the upper through long rib and the lower through long rib in a binding manner.

6. The box girder model according to claim 5, wherein the number of the upper through-length ribs is three or more, the number of the lower through-length ribs is the same as the number of the upper through-length ribs, and the number of the stirrups is three or more.

7. The box beam model of claim 1, wherein when the length of the steel strand is greater than or equal to 400mm, the maximum total force elongation of the steel strand is greater than or equal to 3.5%;

when the initial load of the steel strand is 70% of the actual maximum force of the steel strand, the 1000-hour stress relaxation rate of the steel strand is less than or equal to 2.5%;

and when the initial load of the steel strand is 80% of the actual maximum force of the steel strand, the 1000-hour stress relaxation rate of the steel strand is less than or equal to 4.5%.

8. A box girder model according to any one of claims 1 to 7, wherein the diameter of the corrugated pipe is 5 to 10 cm, the diameter of the steel reinforcement is 8 to 20 mm, and the length of the steel strand is greater than or equal to the length of the corrugated pipe.

9. A box girder according to claim 1, wherein the setting-hardenable structural material is concrete or cement mortar.

10. A box girder model according to claim 1, wherein the box girder model is a rectangular parallelepiped having a length of more than 3 meters, a width of more than 50 cm and a height of more than 60 cm.