CN113482239B - High-performance concrete permanent formwork square steel pipe combination beam and manufacturing method thereof - Google Patents

Abstract

The invention discloses a high-performance concrete permanent formwork square steel tube combined beam which consists of a high-performance concrete permanent formwork, a square steel tube and plain concrete, and solves the problems that a large amount of manpower, material resources and time cost are consumed in construction site formwork engineering, and the traditional formwork is discarded after being used to cause waste and the like. The invention provides a manufacturing method of a high-performance concrete permanent template square steel pipe composite beam, which is beneficial to improving the integral rigidity of the beam and the stress performance of a structure. The prefabricated square steel tube is used for replacing a tension steel bar and a sheared stirrup in a traditional steel reinforcement cage, the prefabricated square steel tube and an outer-layer high-performance concrete formwork are integrally cast together to form a permanent formwork of the composite beam, and only plain concrete is poured into the frame in the subsequent field construction. The method for connecting the combined continuous beam only needs to transport the permanent formwork to the site, connect the permanent formwork by using the connecting piece, the bolt and the nut before pouring the plain concrete, and then use cement mortar to plug the preformed hole of the outer formwork and trowel the preformed hole.

Description

A high-performance concrete permanent formwork square steel pipe composite beam and its manufacturing method

technical field

The invention belongs to the technical field of composite beams, in particular to a high-performance concrete permanent formwork square steel pipe composite beam and a manufacturing method thereof.

Background technique

From the perspective of traditional building construction techniques, the main construction steps of concrete structure buildings are: three steps: supporting formwork, binding steel bars, and pouring concrete; traditional formwork selection, usually made of wood and steel; wooden and steel formwork In the process of use, support is often required in advance, and it must be dismantled after the concrete pouring is completed. The process of support and dismantling often requires a lot of manpower and material resources, resulting in higher construction costs.

In recent years, China's economic level and construction technology have been continuously improved, and the construction industry is also advancing steadily; green buildings have become the main theme of the current era; among them, prefabricated components are more in line with the requirements of green buildings; the present invention belongs to assembled integral structural components, The formwork is made of high-performance concrete. The prefabrication of the formwork is completed in the factory, and square steel pipes are embedded inside it. Square steel pipes are used instead of ordinary steel cages. The on-site construction only needs to pour plain concrete; before pouring concrete for traditional formwork, Brushing waste engine oil on the formwork surface will not only affect the appearance quality of the structure to a certain extent, but also have a certain influence on the bonding between the concrete and the external plaster, which is easy to hollow out; compared with the traditional formwork, the permanent formwork in the present invention: On the one hand, the permanent formwork and the post-cast concrete can realize common stress, coordinate deformation, increase the stiffness of the beam, and achieve the purpose of improving the mechanical performance of the structure; on the other hand, the use of permanent formwork can save the process of dismantling the formwork and save a lot of The realization of green construction has important research and practical significance for the rapid advancement and implementation of construction industrialization.

The formwork project in the site construction requires a lot of manpower and material resources, which is a major cost item of construction; the cost of the formwork project accounts for more than half of the entire construction project; therefore, the formwork project affects the cost and cost of the entire project. Construction period; the high-performance concrete permanent formwork square steel pipe composite beam can realize factory production, the installation is simple and does not need to be disassembled during the construction process, and the degree of mechanization is high; the application of this type of formwork to actual projects can reduce on-site assembly operations, shorten the construction period, and reduce project costs. , Promote the industrialization of the concrete structure construction process, in line with the environmental protection requirements of green construction.

Up to now, our country is undergoing an important stage of economic system transformation and vigorous development of science and technology; the construction industry must keep up with the pace of development of the times, adapt to the situation, develop and update the original concept, change the original production mode, transform production results; combined with the current situation, it is of great significance to promote the development of the construction industry to industrialization; Realize the requirements of "four sections and one environmental protection"; and the main signs of construction industrialization are scientific organization and management, standardized architectural design, factory production of components and parts, and mechanization of construction; China's construction industrialization is moving towards a new process, which further improves the level of China's construction construction, and finally the beautiful vision is realized, and the level of science and technology moves to a higher level!

Contents of the invention

In order to solve the waste of wooden formwork and steel formwork in traditional construction, formwork engineering in traditional on-site construction consumes a lot of manpower, material resources, and time, and the turnover rate of formwork is low and construction efficiency is low. The invention provides a high-efficiency Performance concrete permanent formwork square steel pipe composite beam and its manufacturing method, the method can make the permanent formwork and the post-cast concrete realize joint stress and coordinated deformation, and achieve the purpose of improving the mechanical performance of the structure; it can also save the process of dismantling the formwork, saving Removing a lot of labor costs, material costs and time costs to achieve green construction can improve the efficiency of building construction and is suitable for industrialized large-scale production. It has important research and practical significance for the rapid advancement and implementation of building industrialization.

Technical solutions

A high-performance concrete permanent formwork square steel pipe composite beam and its manufacturing method (see accompanying drawing 1 of the specification), the high-performance concrete permanent formwork square steel pipe composite beam is composed of high-performance concrete permanent formwork 1, square steel pipes in the permanent formwork 2. The interior is filled with plain concrete 3. In order to save costs, the high-performance concrete 1 inside the permanent formwork is replaced with ordinary washed river sand and 400 mesh heavy calcium carbonate; the permanent formwork is composed of Composed of high-performance concrete U-shaped formwork and square steel pipe. The square steel pipe is embedded in the high-performance concrete U-shaped formwork. It is poured together with the U-shaped formwork during production. The thickness of the high-performance concrete formwork is 20mm. The edge of the top plate of the square steel pipe 20mm from the edge of the side panel of the high concrete U-shaped formwork; the present invention uses a square steel pipe to replace the common reinforcement cage, and the bottom plate of the square steel pipe is a complete rectangular plate; the side panels of the square steel pipe are equidistantly provided with rectangular holes, and the holes The width is the same as the hole spacing; the top plate of the square steel pipe is equally spaced and the side plate holes are dislocated to open square holes; the interior of the composite beam is filled with plain concrete.

The present invention also relates to a combined continuous connection method of high-performance concrete permanent formwork square steel pipes (see accompanying drawing 2 of the specification), the connection structure of combined continuous beams includes: high-performance concrete permanent formwork 1, square steel pipes 2 in the permanent formwork, Internally filled plain concrete 3, square steel pipe connector 4, bolt hole 5, bolt hole 5' corresponding to the schematic diagram, and reserved hole for the outer permanent formwork (opening holes for the inner square steel pipe and the outer high concrete) 6; the main method It is a connection method in which prefabricated connectors are embedded into the square steel pipes at the ends of two composite beams, the bolt rods are inserted into the reserved holes of plain concrete and the bolt holes of the connectors, and then the two ends of the bolt rods are tightened with bolt nuts ;The connectors are prefabricated by the factory, using square steel pipes, and 8 bolt holes are equally spaced on the four plates of the connectors; The height and width of the nut are intercepted; the hole diameter of the nut matches the diameter of the bolt shank.

As a preferred technical solution of the present invention, when making the connectors of the high-performance concrete permanent formwork square steel pipe composite continuous beam, each plate surface is designed to use 8 bolt holes according to the force requirements.

A high-performance concrete permanent formwork square steel pipe composite beam and a manufacturing method thereof, comprising the following steps:

The first step is to prepare the high-performance concrete required in the permanent formwork of the outer layer of the composite beam, and analyze the mechanical properties of the high concrete specimens for compressive strength and flexural strength to obtain the best mix ratio; in the traditional configuration method, use Quartz sand, quartz powder, the present invention considers cost, replaces quartz sand with washed river sand, and replaces quartz powder with 400 mesh heavy calcium carbonate powder; the replaced material is similar in nature to the raw material, and can greatly reduce the cost;

The second step is to determine the size of the square steel pipe, and determine the height and width of the square steel pipe according to the size of the composite beam;

The third step is to calculate the thickness of the square steel pipe bottom plate by designing the bending moment borne by the composite beam (the square steel pipe bottom plate is equivalent to replacing the bending steel bar);

The fourth step is to order square steel pipes, and order square steel pipes according to the height, width, thickness and beam length of square steel pipes;

The fifth step is to calculate the number of openings and opening spacing of the square steel pipe web by designing the shear force borne by the composite beam (the square steel pipe web is equivalent to replacing the shear stirrup);

The sixth step is to open holes on the top plate of the square steel pipe. According to the opening position of the web plate of the square steel pipe, open holes at the staggered positions of the top plate and web of the square steel pipe (to avoid the penetration effect of three-sided openings and affect the mechanical properties);

The seventh step is to mix the high-performance concrete, and use the horizontal shaft forced mixer to mix the high-performance concrete used in the interior;

The eighth step is to support the outer formwork of the high-performance concrete permanent formwork and the inner formwork of the bottom slab, and pour the bottom slab of the high-performance concrete permanent formwork

The ninth step is to use a high-frequency vibrator to fully build high-performance concrete for the permanent formwork floor;

The tenth step, after the bottom plate of the high concrete formwork is poured and reaches a certain strength, the inner mold of the bottom plate is removed, the bottom plate of the square steel pipe is centered on the bottom plate of the high concrete formwork, and the web hole of the square steel pipe is sealed inside the steel pipe with a wooden formwork. The square steel pipe web is used as the inner formwork of the side panel of the high concrete formwork, and the side panel of the permanent formwork of the high concrete formwork is poured;

The eleventh step is to use a high-frequency vibrator to fully build high-performance concrete on the side panels of the permanent formwork;

In the twelfth step, maintain the high-performance concrete formwork, the permanent formwork described in the present invention is different from the properties of ordinary plain concrete, and needs to be demolished and maintained in advance;

The thirteenth step, when the high concrete formwork reaches a certain strength, mix plain concrete and pour plain concrete into it;

The fourteenth step is to maintain the composite beam member;

A method for continuously connecting high-performance concrete permanent formwork square steel pipes, comprising the following steps:

The first step is to repeat the above composite beam manufacturing method and insert the prefabricated connectors into the square steel pipe of the left beam before pouring the plain concrete inside;

The second step is to put the square steel pipe of the right beam on the connecting piece;

The third step is to align the aperture centers of the 8 bolt holes on the connector with the aperture centers of the reserved holes of the outer permanent formwork of the left and right beams;

The fourth step is to intercept the corresponding length of the bolt rod to penetrate the outer permanent formwork, penetrate the connecting piece, pass through the connecting piece, and pass out the permanent formwork;

The fifth step is to tighten the two ends of the bolt rod with the bolt nut;

The sixth step is to use cement mortar to seal and smooth the reserved holes of the outer permanent formwork;

The seventh step is to mix plain concrete and pour plain concrete into it;

The eighth step is to maintain the composite beam members.

Beneficial effects: Compared with the prior art, the square steel pipe composite beam using high-performance concrete permanent formwork and its manufacturing method according to the present invention has the following technical effects:

1. The use of high-performance concrete permanent formwork square steel pipe composite beams and its manufacturing method described in the present invention can solve the problem of waste of wooden formwork and steel formwork in traditional construction, reduce construction waste, and meet the needs of green construction. Requirements to reduce environmental pollution;

2. The use of high-performance concrete permanent formwork square steel pipe composite beams of the present invention and its manufacturing method can solve the problem that formwork engineering consumes a large amount of manpower, material resources and time in traditional on-site construction, and the permanent formwork can be integrated with plain concrete on the spot Eliminate the process of dismantling the formwork, save a lot of labor costs, material costs and time costs, and are suitable for industrialized large-scale production;

3. The high-performance concrete permanent formwork square steel pipe composite beam and its manufacturing method described in the present invention can solve the problems of low formwork turnover utilization rate and low construction efficiency. Transportation to the construction site only completes the steps of pouring plain concrete, which greatly improves the construction efficiency;

4. The high-performance concrete permanent formwork square steel pipe composite beam and its manufacturing method according to the present invention can improve the mechanical properties of the beam; before the traditional formwork is poured, the surface of the formwork must be brushed with waste engine oil, which not only has a certain structural appearance quality It also has a certain influence on the bonding between concrete and external plastering, and it is easy to hollow out; compared with traditional formwork, permanent formwork and post-cast concrete can achieve joint force, coordinate deformation, and improve the rigidity of the beam , to achieve the purpose of improving the mechanical performance of the structure;

5. The use of high-performance concrete permanent formwork square steel pipe composite beam and its manufacturing method according to the present invention can improve the quality of the project; since the prefabricated formwork is prefabricated in the factory, it bears less uncontrollable factors, which reduces the on-site construction to a certain extent The resulting error improves the construction accuracy and helps to enhance the quality of the building;

6. A prefabricated connection method of the present invention when using high-performance concrete permanent formwork square steel pipe combined continuous beam construction, the method is simple, the technical requirements for on-site construction are low, and the construction efficiency and construction quality can be improved.

Description of drawings

The drawings constituting a part of this application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention.

Fig. 1 is a schematic diagram of the overall appearance of a composite beam using a high-performance concrete permanent formwork square steel pipe composite beam according to the present invention.

Fig. 2 is a left sectional view of a composite beam using a high-performance concrete permanent formwork square steel composite beam according to the present invention.

Fig. 3 is a front sectional view (cut inside) of a composite beam using a high-performance concrete permanent formwork square steel pipe composite beam according to the present invention.

Fig. 4 is a front sectional view of a composite beam using a high-performance concrete permanent formwork square steel pipe composite beam according to the present invention (cutting the web of the steel pipe).

Fig. 5 is a top sectional view of a composite beam using a high-performance concrete permanent formwork square steel pipe composite beam according to the present invention.

Fig. 6 is a three-dimensional schematic view of the connectors of the continuous beam combined with high-performance concrete permanent formwork square steel pipes according to the present invention.

Fig. 7 is a top sectional view of the joint of the composite continuous beam using the high-performance concrete permanent formwork square steel pipe composite continuous beam according to the present invention.

Fig. 8 is a top view of the joint of the continuous beam using the high-performance concrete permanent formwork square steel pipe combined continuous beam according to the present invention.

Fig. 9 is a top sectional view of the connecting piece of the composite continuous beam using the high-performance concrete permanent formwork square steel pipe according to the present invention.

Fig. 10 is a front sectional view of the joint of the composite continuous beam using the high-performance concrete permanent formwork square steel pipe composite continuous beam according to the present invention.

Fig. 11 is a front view of the joint of the composite continuous beam using the high-performance concrete permanent formwork square steel pipe composite continuous beam according to the present invention.

Fig. 12 is a front sectional view of the connecting piece of the continuous beam combined with the high-performance concrete permanent formwork square steel pipe according to the present invention.

Explanation of reference signs: 1-high-performance concrete permanent formwork, 2-square steel pipe, 3-plain concrete, 4-connector, 5-bolt hole, 5'-corresponding bolt hole, 6-reserved hole in the outer permanent formwork.

Detailed ways

The specific embodiment of the present invention is described in further detail below in conjunction with accompanying drawing:

1. Prepare the high-performance concrete required in the outer permanent formwork of composite beams:

Prepare the high-performance concrete required in the permanent formwork of the outer layer of the composite beam, and conduct experiments on the compressive strength and flexural strength of the high-concrete specimens to analyze its mechanical properties to obtain the best mix ratio; traditional configuration methods use quartz sand, quartz In this invention, for cost considerations, the quartz sand is replaced with washed river sand, and the quartz powder is replaced with 400 mesh heavy calcium carbonate powder; the replaced material is similar in nature to the raw material, and can greatly reduce the cost; after multiple adaptations , and finally get the best fit as shown in Table 1;

Table 1 Mix ratio of high performance concrete

Compression test: Three 100mm cube test blocks were made with high-performance concrete, and the compressive strength of the cubes was measured using a hydraulic servo testing machine; the average compressive strength of high-performance concrete was 129.85MPa; 100mm cubes were made with ordinary concrete There are three test blocks, and the average compressive strength of ordinary concrete test blocks is 28.25MPa; it can be seen that the compressive strength of high-performance concrete is much higher than that of ordinary mixed concrete;

Flexural test: High-performance concrete and ordinary concrete were used to make prism specimens of 100mm×100mm×400mm, and the flexural strength of high-grade concrete was obtained through four-point bending tests. The average value of the flexural strength was 12.51MPa. The average flexural strength of concrete is 5.52MPa.

2. Making the permanent formwork of the high-performance concrete permanent formwork square steel pipe composite beam

Step 1: Determine the height and width of the square steel pipe according to the size of the composite beam;

The width of square steel pipe in the present invention=beam width-both sides plate thickness (2*20=40mm), the height of square steel pipe=beam height-bottom side template thickness (20mm)-protective layer thickness (20mm);

Step 2: Calculate the thickness of the square steel pipe bottom plate by designing the bending moment borne by the composite beam (the square steel pipe bottom plate is equivalent to replacing the bending steel bar);

Through the design of the bending moment of the composite beam, the type of the bottom steel plate is determined, and the thickness of the bottom steel plate is adjusted to equivalently replace the bending steel bar, so as to obtain the thickness of the bottom steel plate of the square steel pipe;

Step 3: Order square steel pipes; order square steel pipes according to the height, width, thickness and beam length of the square steel pipes;

Step 4: Calculate the number of openings and opening spacing of the square steel pipe web by designing the shear force borne by the composite beam (the square steel pipe web is equivalent to replacing the shear stirrups);

The most economical opening size (number of openings and opening spacing) of the square steel pipe web is obtained by designing the shear force borne by the composite beam; the square steel pipe web is the same type and thickness as the bottom steel plate, and the square steel pipe web is used When replacing the shear stirrups, the shear bearing capacity of the web surface of the entire square steel pipe is much greater than the design value of the shear bearing capacity, so it is necessary to open holes on the web surface of the square steel pipe for the purpose of saving steel and strengthening the steel pipe web. The bonding effect between the slab and the outer high-performance concrete;

Step 5: Open the top plate of the square steel pipe; according to the opening position of the web of the square steel pipe, open the hole at the staggered position of the opening of the top plate of the square steel pipe and the web (to avoid the penetration effect of the three-sided opening, which affects the mechanical properties);

The hole size and position of the upper steel plate of the square steel pipe are dislocated according to the hole position of the side panel to prevent the three-sided openings of the steel pipe from having a penetration effect at the same position, thereby affecting the mechanical properties of the square steel pipe; the top plate of the square steel pipe is opened , it can not only facilitate the pouring and vibration of plain concrete, but also save steel and reduce costs. This method kills two birds with one stone;

Step 6: mixing high-performance concrete; using a horizontal shaft forced mixer to mix the high-performance concrete used in the system;

High-performance concrete is prone to uneven mixing during the mixing process, and has high cohesion, so new mixers such as horizontal shaft forced mixers should be used during the mixing process;

Step 7: Support the outer formwork of the permanent formwork of high concrete and the inner formwork of the base plate, and pour the base plate of the permanent formwork of high performance concrete

Step 8: Use high-frequency vibrators to fully build high-performance concrete for the permanent formwork floor;

Step 9: After the bottom plate of the high concrete formwork is poured and reaches a certain strength, remove the inner mold of the bottom plate, center the bottom plate of the square steel pipe on the bottom plate of the high concrete formwork, seal the web hole of the square steel pipe inside the steel pipe with a wooden formwork, and use a square The steel pipe web is used as the inner formwork of the side panel of the high concrete formwork, and the side panel of the high concrete permanent formwork is poured;

Step 10: Use a high-frequency vibrator to fully build high-performance concrete on the side panels of the permanent formwork;

Step 11: Maintain high-performance concrete formwork;

The high-performance concrete used in the present invention is different from ordinary concrete in terms of shrinkage and creep properties, so attention should be paid to the maintenance process during construction, especially the early stage wet curing process; for the combination described in the present invention The permanent formwork of the beam needs to be removed and maintained in advance; the curing time should not be less than 14 days. During the curing period, the internal temperature of the concrete should be less than or equal to 750°C, and the temperature difference between the inside and outside of the specimen should be controlled not to exceed 250°C; water should be collected for early wet curing The way of spraying can avoid excessive temperature difference between inside and outside of the concrete, which will cause cracks in the concrete.

3. The inner core of the composite beam is poured with plain concrete

The ordinary concrete of the inner core of the composite beam described in the present invention, the concrete strength grade is selected by the actual design bearing capacity requirement;

In the ordinary concrete pouring process of the inner core of the composite beam described in the present invention, when the concrete is poured into the mould, the impact formwork cannot be poured concentratedly, and the concrete must be poured within five hours; the duration of vibration should make the concrete surface produce laitance, without Bubbles, until the concrete does not sink; wait until the concrete is finally set, cover the beam surface with a plastic film to reduce water loss, and regularly water to ensure humidity, and perform a loading test after 28 days of curing.

Four, the present invention also includes a kind of connection method of high-performance concrete permanent formwork square steel tube combined continuous beam

The square steel pipe composite beam using high-performance concrete permanent formwork described in the present invention can be divided into two types according to the number of supports of the bending member; one is a simply supported beam, and the other is a continuous beam; simply supported beam It means that the two ends of the beam are placed on two supports, one end is hinged and the other end is fixed. In reality, it is a beam with only two ends supported on the column, and it is a single-span structure that mainly bears the bending distance; a continuous beam is a single-span structure with three or more The support can be simplified to a statically indeterminate structure calculation model, and there is also a beam supported by columns in the middle of the simply supported beam foundation; for simply supported beams, there is no need to consider the connection problem of the beams during construction, only the beams need to be lapped between two Just on the column; for the continuous beam, in addition to the support of the columns at both ends, there is often a main support in the middle of the span, so the connection problem of the continuous beam needs to be considered;

Step 1: Repeat the above-mentioned manufacturing method of the composite beam and insert the prefabricated connectors into the square steel pipe of the left beam before pouring the plain concrete inside;

Step 2: Put the square steel pipe of the right beam on the connecting piece;

Step 3: Align the aperture centers of the 8 bolt holes on the connector with the aperture centers of the reserved holes of the outer permanent template;

Step 4: Cut the corresponding length of the bolt rod and penetrate the outer permanent formwork, penetrate the connecting piece, pass through the connecting piece, and pass out the permanent formwork;

Step 5: Tighten both ends of the bolt rod with the bolt nut;

Step 6: Use cement mortar to seal and smooth the reserved holes of the outer permanent formwork;

Step 7: mixing plain concrete and pouring plain concrete inside;

Step 8: Maintain the composite beam member;

Description of the drawings of the connector of the present invention: Fig. 7-Fig. 9 respectively introduces the top view section of the continuous beam connection and the top view surface of the continuous beam connection from the top view direction of the continuous beam (the side showing the length and width of the beam) and the top view section of the connector, showing the position of the connector, the positional relationship of various materials at the connection, and the dimensional relationship between the connector and the continuous beam; Figure 10-Figure 12 is viewed from the front direction of the continuous beam (showing the length of the beam and the height side) respectively introduce the front section of the continuous beam joint, the front plane of the continuous beam joint and the front section of the connector, showing the location of the connector, the positional relationship of various materials at the joint and the connection Dimensional relationship with continuous beams;

The dimensional description of the connector of the present invention: the length a of the connector is valued according to the construction structure (a=3x spacing+2x margin); the width b' of the connector is valued according to the width b of the beam (b'= b-2x high concrete formwork thickness-2x square steel pipe thickness); the height h' of the connector is determined according to the beam height h (h'=2x square steel pipe thickness-plain concrete protective layer thickness-high concrete formwork thickness).

The specific embodiments described above have further described the purpose, technical solutions and beneficial effects of the present invention in detail; it should be understood that the above descriptions are only specific embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (5)

1. A high-performance concrete permanent formwork square steel pipe composite beam is characterized in that: the high-performance concrete permanent formwork square steel pipe composite beam is made of high-performance concrete permanent formwork (1), square steel pipes (2) in the permanent formwork, The interior is filled with plain concrete (3), and the high-performance concrete of the permanent formwork replaces crushed stone aggregate with ordinary washed river sand and 400 mesh heavy calcium carbonate; the high-performance concrete permanent formwork (1) is U-shaped Formwork, the square steel pipe is embedded in the U-shaped formwork, and is poured together with the U-shaped formwork during production; the thickness of the high-performance concrete permanent formwork (1) is 20mm, and the edge of the top plate of the square steel pipe is the distance from the edge of the side plate of the U-shaped formwork 20mm; the bottom plate of the square steel pipe is a complete rectangular plate; the web of the square steel pipe is equidistantly provided with rectangular holes, and the opening width is the same as the hole spacing; the top plate of the square steel pipe is equidistantly provided with square A hole; the interior of the high-performance concrete permanent template (1) is filled with plain concrete (3). 2. A kind of high-performance concrete permanent formwork square steel pipe composite beam according to claim 1, characterized in that: the composite beam is a composite continuous beam, and the connection structure of the composite continuous beam comprises: square steel pipe type connectors ( 4), the bolt hole (5), the corresponding bolt hole (5'), the reserved hole of the outer permanent formwork (6), the inner square steel pipe (2) and the outer high-performance concrete permanent formwork (1) are opened together; all The connection method of the combined continuous beams includes: using prefabricated connectors to embed in the square steel pipes at the ends of the two composite beams, passing the bolt rods through the reserved holes (6) of the outer permanent formwork and the bolt holes of the connectors, and then using Tighten both ends of the bolt rod with nuts; the connector is prefabricated by the factory and adopts a square steel pipe type, and 8 bolt holes are equally spaced on the four plates of the connector; the 16 bolt rods are divided into two groups, 8 in each group , and its length is intercepted according to the height and width of the composite beam; the hole diameter of the nut matches the diameter of the bolt rod. 3. A high-performance concrete permanent formwork square steel composite beam according to claim 2, characterized in that 8 bolt holes are used for each plate surface of the connector designed according to the force requirements. 4. A manufacturing method based on the high-performance concrete permanent formwork square steel pipe composite beam described in any one of claims 1-3, characterized in comprising the following steps: The first step is to prepare the high-performance concrete required in the permanent formwork of the outer layer of the composite beam, and analyze the mechanical properties of the high-performance concrete specimens for compressive strength and flexural strength to obtain the best mix ratio; replace the quartz sand Wash river sand with water, and replace quartz powder with 400 mesh heavy calcium carbonate powder; The second step is to determine the size of the square steel pipe, and determine the height and width of the square steel pipe according to the size of the composite beam; The third step is to calculate the thickness of the square steel pipe bottom plate by designing the bending moment borne by the composite beam; The fourth step is to order square steel pipes, and order square steel pipes according to the height, width, thickness and beam length of square steel pipes; The fifth step is to calculate the opening number and opening spacing of the square steel pipe web by designing the shear force borne by the composite beam; The sixth step is to open a hole on the top plate of the square steel pipe. According to the opening position of the web plate of the square steel pipe, open the hole at the staggered position of the top plate of the square steel pipe and the web hole; The seventh step is to mix the high-performance concrete, and use the horizontal shaft forced mixer to mix the high-performance concrete used; In the 8th step, support the outer formwork of the high-performance concrete permanent formwork (1) and the inner formwork of the base plate, and pour the base plate of the high-performance concrete permanent formwork (1); In the ninth step, the high-frequency vibrator is used to fully vibrate the high-performance concrete of the permanent formwork (1) bottom plate of high-performance concrete; In the tenth step, after the bottom plate of the high-performance concrete permanent formwork (1) has been poured and reaches a certain strength, the inner mold of the bottom plate is removed, and the bottom plate of the square steel pipe is centered on the bottom plate of the permanent high-performance concrete formwork (1), and the web of the square steel pipe The hole is sealed with a wooden formwork inside the steel pipe, and the square steel pipe web is used as the inner formwork of the side panel of the high-performance concrete permanent formwork (1), and the side panel of the high-performance concrete permanent formwork (1) is poured; In the eleventh step, a high-frequency vibrator is used to fully vibrate the high-performance concrete of the side panel of the high-performance concrete formwork (1); The twelfth step is to maintain the high-performance concrete permanent formwork (1), and the high-performance concrete permanent formwork (1) needs to be demolished and maintained in advance; In the thirteenth step, when the high-performance concrete permanent formwork (1) reaches a certain strength, mix plain concrete (3) and pour plain concrete (3) into it; The fourteenth step is to maintain the composite beam member. 5. A method for making a high-performance concrete permanent formwork square steel pipe composite beam according to claim 4, characterized in that: when the composite beam is a composite continuous beam, its connecting steps include: The first step is to embed the prefabricated connectors into the square steel pipes of the left beam before pouring plain concrete (3) inside; The second step is to put the square steel pipe of the right beam on the connecting piece; In the third step, align the aperture centers of the 8 bolt holes on the connector with the aperture centers of the reserved holes (6) of the outer layer permanent templates of the left and right beams; The fourth step is to intercept the corresponding length of the bolt rod to pass through the outer permanent formwork; The fifth step is to tighten the two ends of the bolt rod with nuts; The sixth step is to use cement mortar to seal and smooth the reserved holes of the outer permanent formwork; The seventh step is to mix the plain concrete (3) and pour the plain concrete (3) inside it; The eighth step is to maintain the composite beam members.

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