CN114892874A - A kind of containment long-span dome and its construction method - Google Patents

Abstract

The invention relates to a large-span dome of a containment shell, comprising a first pouring section, a pouring layer and a second pouring section. The first pouring section is connected to the concrete corbel and forms an included angle with the concrete corbel; the pouring section The layer is arc-shaped, one end is connected to the first pouring section, and its arc direction is toward the side close to the ground and extends away from the first pouring section; the number of the second pouring section is at least one, At least one of the second pouring sections is connected to the side of the pouring layer away from the ground, is attached to the second pouring section, and is connected to the first pouring section; the first pouring section is connected to the second pouring section. An annular main beam is arranged at the connection between the pouring section and the pouring layer. The invention also provides a construction method for a large-span dome of a containment shell, and the use of the large-span dome of a containment shell and the construction method of the invention can reduce the construction of scaffolding during the construction process.

Description

Containment long-span dome and construction method thereof

technical field

The invention belongs to the field of design and construction of building structures, in particular to a containment large-span dome and a construction method thereof.

Background technique

The outer containment dome of the nuclear power plant is arranged directly above the inner containment dome of the reactor building. It has the characteristics of small construction and operation space, large span, large thickness, and self-heavy weight. It is a dangerous project exceeding a certain scale. Greater construction risk and construction difficulty.

At present, in nuclear power projects, the traditional construction method of full-floor scaffolding is generally adopted. The erection and dismantling of the scaffolding requires a lot of materials, labor and construction time; and the inner shell is spherical, and the problem of personnel passage is relatively prominent, resulting in the inner shell. There is no reliable working plane, and a temporary platform needs to be set up. The concrete construction load is directly transmitted to the inner shell dome, which affects the safety of the inner dome. Moreover, the construction of the inner dome and the outer shell dome has cross operations, which requires the removal of the scaffolding work in the middle, which seriously affects the construction period.

Therefore, there is a need for a large-span containment dome and a construction method that is less affected by the working environment, has a small amount of engineering, and has low construction costs.

SUMMARY OF THE INVENTION

In view of the defects existing in the prior art, the purpose of the present invention is to provide a large-span dome of a containment and a construction method thereof to reduce the cumbersome degree of construction.

In order to achieve the above purpose, the technical scheme adopted in the present invention is: a large-span dome of a containment shell includes a first pouring section, a pouring layer and a second pouring section, and the first pouring section is connected to the concrete corbel, and is connected with the concrete. The corbel is at an included angle; the pouring layer is in an arc shape, one end is connected to the first pouring section, and its arc direction is toward the side close to the ground and extends away from the first pouring section; the first pouring section is The number of the second pouring sections is at least one, and at least one of the second pouring sections is connected to the side of the pouring layer away from the ground, is attached to the second pouring section, and is connected to the first pouring section; the An annular main beam is arranged at the connection between the first pouring section, the second pouring section and the pouring layer.

Further, the number of the second pouring sections is multiple, and the annular main beams are arranged between the plurality of second pouring sections.

Further, the annular main beam is provided with connecting ties to prevent the annular main beam from falling off after pouring.

Further, the connecting tie bars are connected by welding or sleeve connection.

Further, distribution steel bars are also arranged at the pouring layer.

Further, shear studs are also provided on the second pouring section to prevent the concrete from slipping at the connection.

Further, dome steel bars are also provided on the first pouring section and the second pouring section to increase the safety of use after pouring.

Further, the annular main beam is H-beam.

Further, the welding is connected to the connection between the first pouring section, the pouring layer and the second pouring section.

The invention also provides a construction method for a large-span dome of a containment shell, which comprises the steps of: hoisting and fixing the steel formwork for the construction of the dome as a whole; arranging an annular main beam at the construction joint, and setting a connecting tie at the annular main beam; binding Dome steel bars, and pour the first pouring section to form the first section of concrete; set distribution steel bars at the pouring layer, and pour the pouring layer; set shear studs and connecting ties at the second pouring section; bind the dome steel bars , pour the second section of concrete.

The effect of the present invention is that the construction of scaffolding can be canceled in the construction process through the form of segmented pouring of the first pouring section, the pouring layer and the second pouring section, and the traditional construction method overcomes the large amount of construction work and the high construction risk of scaffolding. , cross operation and other shortcomings, ensure the construction safety of the steel formwork, improve the on-site construction efficiency, avoid cross operation, and shorten the construction period.

Description of drawings

Fig. 1 is the sectional structure schematic diagram of a kind of containment long-span dome of the present invention;

Figure 2 is a schematic diagram of the positional relationship between the dome construction steel formwork and the reinforcing bars;

Fig. 3 is a flow chart of steps of a construction method for a large-span dome of a containment.

Description of reference numbers:

10. The first pouring section; 20. The pouring layer; 30. The second pouring section;

21. Distribution steel bars; 31. Shear studs; 40. Circumferential main beams; 41. Connecting ties; 42. Dome steel bars.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

As shown in Figures 1-3, the present invention provides a large-span containment dome, which includes a first pouring section 10, a pouring layer 20 and a second pouring section 30. The first pouring section 10 is connected to the concrete corbel, And it forms an angle with the concrete corbel to form an effective lateral support for subsequent pouring. The pouring layer 20 is arc-shaped, one end is connected to the first pouring section 10 , and its arc direction is toward the side close to the ground and extends away from the first pouring section 10 . The number of the second pouring sections 30 is at least one, and the at least one second pouring section 30 is connected to the side of the pouring layer 20 away from the ground, all of which are attached to the side of the pouring layer 20 that is far away from the ground, and are connected to the first pouring section 10, Circumferential main beams 40 are provided at the connection between the first pouring section 10 and the pouring layer 20 and the second pouring section 30 to increase the connection strength between the first pouring section 10 and the second pouring section 30 and the pouring layer 20 .

It can be understood that the first pouring section 10, the pouring layer 20 and the second pouring section 30 are the skeleton of the dome, which can be connected as a whole, and then hoisted and connected to the concrete corbel, or it can be first connected with the concrete corbel, and then connected to the concrete corbel. Connect in sequence.

It can be understood that the first pouring section 10, the pouring layer 20 and the second pouring section 30 are all composed of construction steel formwork, such as arc-shaped steel plates, profiled steel main beams, secondary beams and other components. The specific composition method and composition structure depends on the dome structure. Depends.

It can be understood that the number of the second pouring sections 30 is determined according to the pouring load. When the load is small, there may be one second pouring section 30. Preferably, the number of the second pouring sections 30 is multiple.

It can be understood that when the number of the second pouring sections 30 is multiple, the plurality of second pouring sections 30 are connected in sequence and are all connected to the side of the pouring layer 20 away from the ground. One of the first pouring sections 10 is connected to the first pouring section 10 .

Further, there are a plurality of second pouring sections 30 , and an annular main beam 40 is arranged between the plurality of second pouring sections 30 .

Further, connecting ties 41 are provided at the circumferential main beams 40 to prevent the circumferential main beams 40 from falling off after pouring.

Further, the connecting tie bars 41 are connected by means of threaded sleeves or welding.

It can be understood that the connecting tie bars 41 can be of any structure, as long as it can achieve the effect of preventing the hoop girder 40 from falling off after pouring.

Further, distributed reinforcement bars 21 are provided at the pouring layer 20, and the distribution reinforcement bars 21 are arranged to have greater bearing capacity after pouring.

Further, the second pouring section 30 is also provided with shear studs 31 , and by setting the shear studs 31 , the concrete at the connection is prevented from slipping.

Further, the first pouring section 10 and the second pouring section 30 are also provided with dome steel bars 42, and the dome steel bars 42 are provided to increase the safety of use after pouring.

It can be understood that the circumferential main beam 40 is an H-shaped steel, which is disposed at the construction joint by welding.

It can be understood that the construction joint is the connection between the first pouring section 10 and the pouring layer, the first pouring section 10 and the second pouring section 30 and a plurality of second pouring sections 30 .

In the present invention, after the steel structures of the first pouring section 10, the pouring layer 20, the second pouring section 30 and the circumferential main beam 40 are prefabricated, they are hoisted as a whole, fixed on the concrete corbels in the above-mentioned manner, and then used Concrete the first pouring section 10 to form the first section of concrete, then pour the concrete layer to form the pouring layer 20, and finally pour at least one second section pouring section 30 to complete the construction of the long-span dome of the containment.

The present invention also provides a construction method of a large-span dome, comprising the steps of:

S1, the overall hoisting fixed dome construction steel formwork;

Specifically, after the prefabrication of the construction steel formwork of the dome, including the arc-shaped steel plate, the main beam of profiled steel, the secondary beam, etc., is completed, it is fixed on the concrete corbel as a whole by means of hoisting.

Taking a specific example as an illustration, after the prefabrication of the first pouring section, the pouring layer, the second pouring section and the circumferential girder is completed, one end of the first pouring section is connected to the concrete corbel, and the other end is connected to the pouring layer and the third section. The second pouring section is to complete the connection and fixation of each construction steel formwork of the dome.

It can be understood that the connection method can be any method such as screw, welding, snap connection, etc., as long as it can be fixed.

S2, set up circumferential main beams at the construction joints, and set up connecting ties at the circumferential main beams;

Specifically, after the overall construction steel formwork of the dome is hoisted and fixed, a circumferential main beam is set at the construction joint to strengthen each section connecting the overall construction formwork, such as the first pouring section, the pouring layer and the second pouring section.

Connecting tie bars are set by threaded sleeves or welding to prevent the construction steel formwork at the construction gap from being pulled off after pouring and causing the hoop girder to fall off.

S3, bind the dome steel bars, and pour the first pouring section to form the first section of concrete;

Specifically, after setting the girder in the construction gap and setting up the connecting tie bars, the dome steel bars are bound on the first pouring section 10, and the first pouring section is poured first to form the first concrete section, and then the first concrete section is formed. Lateral support for the steel formwork of the pour layer and the second pour section.

S4, set distribution steel bars at the pouring layer, and pour the pouring layer;

Specifically, by arranging and distributing steel bars to the surface of the pouring layer, and then pouring, a steel formwork with greater bearing capacity is formed.

S5, set shear studs and connecting ties at the second pouring section;

Specifically, shear studs are arranged on the surface of the radial section steel main beam of the second pouring section to prevent the concrete from slipping at the interface of the construction joint after pouring, and connecting ties are arranged at the circumferential main beam on the second pouring section , to prevent the annular main beam at the construction joint from falling off after pouring.

S6, tie the dome steel bars, and pour the second section of concrete;

Specifically, after the above steps are completed, the second pouring section is bound with dome steel bars and poured to form the second section of concrete.

It can be seen from the above-mentioned embodiments that the present invention can be used in the construction of the outer safety large-span dome of the nuclear power plant, in view of the characteristics of small construction operable space, large span, large thickness and self-heavy weight, etc., the construction of scaffolding is omitted, and there is no need for temporary Build a platform to reduce workload. .

The device described in the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can obtain other embodiments according to the technical solutions of the present invention, which also belong to the technical innovation scope of the present invention.

Claims (10)

1. a containment shell large-span dome, is characterized in that, comprises: a first pouring section, a pouring layer and a second pouring section, the first pouring section is connected to the concrete corbel and forms an included angle with the concrete corbel; The pouring layer is arc-shaped, and one end is connected to the first pouring section, and its arc direction is toward the side close to the ground, and extends in a direction away from the first pouring section; The number of the second pouring section is at least one, and at least one second pouring section is connected to the side of the pouring layer away from the ground, is fitted with the second pouring section, and is connected to the first pouring section ; An annular main beam is arranged at the connection between the first pouring section, the second pouring section and the pouring layer. 2. a kind of containment long-span dome as claimed in claim 1 is characterized in that: The number of the second pouring sections is multiple, and the annular main beams are arranged between the plurality of the second pouring sections. 3. a kind of containment long-span dome as claimed in claim 1 is characterized in that: The annular main beam is provided with connecting ties to prevent the annular main beam from falling off after pouring. 4. a kind of containment long-span dome as claimed in claim 3 is characterized in that: The connecting tie bars are connected by welding or sleeve connection. 5. a kind of containment long-span dome as claimed in claim 1 is characterized in that: Distributed steel bars are also arranged at the pouring layer. 6. a kind of containment long-span dome as claimed in claim 1 is characterized in that: The second pouring section is also provided with shear studs to prevent the concrete from slipping at the connection. 7. a kind of containment long-span dome as claimed in claim 1 is characterized in that: The first pouring section and the second pouring section are also provided with dome steel bars to increase the safety of use after pouring. 8. a kind of containment long-span dome as claimed in claim 1 is characterized in that: The annular main beam is H-section steel. 9. a kind of containment long-span dome as claimed in claim 1 is characterized in that: The annular main beam is connected to the connection between the first pouring section, the pouring layer and the second pouring section by welding. 10. a construction method of containment large-span dome, is characterized in that, comprises the steps: The overall hoisting and fixing of the dome construction steel formwork; Circumferential main beams are set at the construction joints, and connecting ties are set at the circumferential main beams; Bind the dome steel bars and pour the first pouring section to form the first section of concrete; Distributed steel bars are arranged at the pouring layer, and the pouring layer is poured; Set shear studs and connecting ties at the second pouring section; The dome steel bars are tied and the second section of concrete is poured.

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