Welding-free assembled partially covered steel-concrete composite component and construction method

Abstract

The present invention discloses a weld-free assembled partially covered steel-concrete composite component and a construction method thereof. The composite component comprises a steel frame body, wherein the steel frame body is composed of an upper flange at an upper portion, a lower flange at a lower portion, and a web connecting the upper and lower flanges, wherein the web divides the space between the upper flange and the lower flange into two left and right cavities, wherein the left and right cavities are used to place concrete precast parts, wherein a reinforcement skeleton is pre-embedded in the concrete precast parts, a part of the reinforcement skeleton extends out of the concrete precast parts and forms an upper tie hook that can be hooked with the upper flange and a lower tie hook that can be hooked with the lower flange at the upper and lower ends respectively; a group of pre-placed concrete precast parts opposite to each other in the cavities on both sides of the web are fastened and connected to the web as a whole via fasteners.

Description

Technical Field

[0001] The present invention belongs to the technical field of civil engineering composite structures, and in particular relates to an assembled partially covered steel-concrete composite component free of welding parts and a construction method thereof. Background Art

[0002] In recent years, with the increasingly prominent contradictions such as overcapacity in the steel industry and imbalance in supply and demand in the sand and gravel market, and the aging population leading to a continuous decrease in the number of workers in the construction industry and rising labor costs, relevant departments have continued to increase their efforts to promote prefabricated steel structure buildings. In 2020, the Ministry of Housing and Urban-Rural Development and other departments pointed out in the "Several Opinions on Accelerating the Development of New Building Industrialization" that it is necessary to vigorously develop steel structure buildings. The partially coated steel-concrete composite structure is a composite structure in which concrete is coated between the outer contours of the main steel parts of the open section and the main steel parts and concrete are subjected to force together. It has the advantages of high degree of prefabrication and assembly of steel structures, superior seismic performance, and green environmental protection. It has greater rigidity and better fire and corrosion resistance than steel structures. It is currently widely used in practical engineering in Zhejiang, Shanghai, Anhui, Liaoning and other places.

[0003] Traditional partially encapsulated steel-concrete composite components generally have connectors welded on the steel frame. However, the welding defects, stress concentration and residual tensile stress introduced by the welded connectors make the partially encapsulated steel-concrete composite components extremely sensitive to fatigue loads, which can easily lead to brittle fatigue failure without signs, seriously threatening the safety of the structure. In addition, traditional partially encapsulated steel-concrete composite components require the steel frame to be manufactured first, and then the concrete on both sides is processed separately, which takes a long time to manufacture. Moreover, wet concrete pouring operations can easily lead to corrosion of the steel frame. Therefore, it is urgent to propose an assembled partially encapsulated steel-concrete composite component that does not require welding parts and a construction method thereof. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art and provide an assembled partially clad steel-concrete composite component without welding parts that can effectively improve processing efficiency and service life.

[0005] The technical problem to be solved can be implemented through the following technical solutions.

[0006] A weld-free assembled partially covered steel-concrete composite component, which is characterized by including:

[0007] A steel frame body, the steel frame body is composed of an upper flange, a lower flange and a web connecting the upper and lower flanges, the web divides the space between the upper flange and the lower flange into two left and right cavities, the left and right cavities are used to place concrete precast parts, a reinforcement skeleton is embedded in the concrete precast parts, a part of the reinforcement skeleton extends out of the concrete precast parts and forms an upper tie hook that can be hooked with the upper flange and a lower tie hook that can be hooked with the lower flange at the upper and lower ends respectively;

[0008] A group of prefabricated concrete parts which are arranged opposite to each other in the cavities at both sides of the web are fastened and connected to the web as a whole via fasteners.

[0009] Furthermore, the web is arranged perpendicularly to the upper flange and the lower flange.

[0010] Preferably, the main body of the reinforcement skeleton is a butterfly-shaped connecting piece, and the upper and lower wing tips of the butterfly wings on both sides of the butterfly structure respectively form the upper tie hook and the lower tie hook.

[0011] Preferably, the butterfly structure of the butterfly connector is provided with connecting holes at the chest and abdomen, and a through hole is opened on the plate surface of the web facing the connecting hole, and the fastener connects two relative precast concrete parts pre-installed in the cavities on both sides to the steel frame body through the connecting hole and the through hole.

[0012] Preferably, the reinforcement skeleton in the cavity on one side of the web is composed of a plurality of skeleton units connected as a whole via connectors.

[0013] Preferably, the connecting member is one or more ribs embedded in the precast concrete member; the ribs are tied together with the main body of the rib skeleton (ie, the skeleton unit).

[0014] Another technical problem to be solved by the present invention is to provide a construction method for the aforementioned weld-free assembled partially covered steel-concrete composite member, the method comprising the following steps:

[0015] S1. Making reinforcement skeleton;

[0016] S2. Place the reinforcement skeleton in the formwork, pour concrete, and respectively make concrete prefabricated parts to be placed in the cavities on both sides of the web; when pouring concrete, reserve operation holes at the fastener connection locations;

[0017] S3. Drill penetration holes for fastener connection and fixing at equal intervals on the web of the steel frame body;

[0018] S4, placing the precast concrete parts made in S2 in the cavities on the left and right sides of the web respectively, so that the upper tie hook and the lower tie hook of the reinforcement skeleton are hooked on the upper flange and the lower flange of the steel frame body respectively, and the precast concrete parts on both sides are connected and fastened to the web by fasteners;

[0019] S5. Pour high-strength grouting material into the reserved operation holes of the precast concrete parts on both sides and fill them up.

[0020] Furthermore, the reinforcement skeleton is an FRP part or a stainless steel part.

[0021] Furthermore, the high-strength grouting material is a high-strength slightly expansive cement-based grouting material with a strength grade not less than C85.

[0022] Further, in S2, the inner contour of the template is adapted to the contour of the cavity between the flange and the web of the steel frame body.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The butterfly connectors, longitudinal reinforcements and steel frames are not welded, which significantly improves fatigue performance and extends fatigue life;

[0025] (2) The butterfly connector is made of FRP or stainless steel, which improves the durability of the connector;

[0026] (3) The precast concrete on the left and right sides can constrain the buckling deformation of the web of the steel beam and the inward buckling deformation of the flange, and the butterfly connector can constrain the outward buckling deformation of the flange of the steel beam, ensuring the coordinated work between different components and effectively improving the bearing capacity of the entire prefabricated partially covered steel-concrete composite component;

[0027] (4) The left precast concrete, right precast concrete and steel frame are made separately to prevent the steel frame from being rusted due to wet concrete operation; the three can be processed and manufactured at the same time, which improves the processing efficiency;

[0028] (5) Steel frames, left-side precast concrete, right-side precast concrete, butterfly connectors, longitudinal reinforcement, bolts, and nuts can all be industrially processed and manufactured, which improves processing efficiency and quality and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a cross-sectional view of the assembled partially covered steel-concrete composite component without welding parts provided by the present invention;

[0031] Figure 2It is a detailed partial elevation view of the assembled partially clad steel-concrete composite component without welding parts provided by the present invention;

[0032] Figure 3 It is an elevation view of the assembled partially clad steel-concrete composite component without welding parts provided by the present invention;

[0033] Figure 4 It is a construction flow chart of the assembled partially clad steel-concrete composite component without welding parts provided by the present invention.

[0034] In the figure: 1 - steel frame; 11 - upper flange; 12 - lower flange; 13 - web; 14 - penetration hole;

[0035] 2 – precast concrete on the left; 3 – precast concrete on the right;

[0036] 4——butterfly-shaped connector; 41——upper tie hook; 42——lower tie hook;

[0037] 5——longitudinal reinforcement (rib); 6——bolts; 7——nuts; 8——high-strength grouting material. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. According to the following description, the purpose, technical solutions and advantages of the present invention will become clearer. It should be noted that the described embodiments are preferred embodiments of the present invention, but not all embodiments.

[0039] The present invention provides a weld-free assembled partially covered steel-concrete composite component, comprising a steel frame 1, wherein the steel frame 1 is composed of an upper flange 11, a lower flange 12, and a web 13 connecting the upper and lower flanges, wherein the web 13 is arranged vertically with the upper and lower flanges, and a through hole 14 (through hole) as an assembly hole is provided on the plate surface of the web 13, and the frame-shaped steel frame 1 is divided into two left and right cavities by the web 13 (see Figure 1From a perspective of the invention, two relative concrete precast parts are placed in the cavity on opposite sides of the web 13, and a reinforcement skeleton is embedded in each of the concrete precast parts. The reinforcement skeleton of the present invention is preferably composed of a frame body with a butterfly-shaped connector 4 as the main body, and the upper and lower wing tips of the butterfly wings on both sides of the butterfly structure are respectively provided with an upper tie hook 41 that can be hooked with the upper flange 11 and a lower tie hook 42 that can be hooked with the lower flange 12, and each butterfly-shaped connector 4 is provided with two groups of four such hooked tie hooks (including two symmetrical upper tie hooks 41 and two symmetrical lower tie hooks 42). The chest and abdomen of the butterfly structure are provided with a connecting hole that is directly opposite to the penetration hole 14, and the two such butterfly connectors 4 on both sides of the web 13 are connected through a fastening connector (such as the bolt 6 and nut 7 in the figure), thereby connecting the two relative concrete precast parts pre-set in the cavities on both sides to the frame body of the steel frame.

[0040] Among them, in order to provide stability, the upper and lower parts can also be fastened together by a rib (such as the longitudinal rib 5 in the figure) to connect multiple butterfly connectors 4 arranged on one side of the web 13 (the butterfly connector here can be regarded as a skeleton unit), thereby improving the performance of the rib skeleton and enhancing the strength and stability.

[0041] The precast concrete parts on both sides of the web 13 are respectively the left precast concrete 2 and the right precast concrete 3. During precasting, an operation hole needs to be reserved on the concrete component. After the concrete component is pre-set and fastened to the steel frame by fastening connectors, high-strength grouting material 8 is poured in the operation hole to fill it.

[0042] Among them, the butterfly connector 4 is made of FRP or stainless steel; the width of the butterfly connector 4 and the spacing between adjacent butterfly connectors (referring to the spacing between adjacent butterfly connectors arranged on one side of the web 13) are not less than 100mm; the middle through hole is a reserved connection hole, and the tie hook is set at the end.

[0043] In addition, the longitudinal reinforcement 5 (ribs) is made of steel bars or FRP bars.

[0044] In addition, it should be particularly noted that the precast concrete part mentioned in the present invention can be regarded as a precast unit including a reinforcement skeleton, and sometimes a plurality of such units can also be regarded as a precast concrete part.

[0045] The following is a construction method of the assembled partially covered steel-concrete composite member without welding parts of the present invention, which specifically includes the following steps:

[0046] S1. Make a customized butterfly connector 4, and tie the butterfly connector 4 and the longitudinal reinforcement 5 to form a reinforcement skeleton;

[0047] S2. Place the reinforcement skeleton in the formwork and pour concrete to produce precast concrete 2 on the left and precast concrete 3 on the right; the inner contour of the formwork is consistent with the cavity contour between the flange and the web of the steel frame 1; when pouring concrete, reserve an operation hole at the connection hole of the butterfly connector 4.

[0048] S3. Drill penetration holes 14 at equal intervals on the web of the steel frame 1; the diameter of the penetration holes is not less than 10 mm and not more than 20 mm, and the spacing between the penetration holes (referring to the spacing between the penetration holes of two adjacent butterfly connectors) is not less than 100 mm.

[0049] S4, place the left precast concrete 2 and the right precast concrete 3 in the cavities on the left and right sides of the steel frame web 13 respectively, make the tie hooks of the butterfly connector 4 hook the steel frame flange, pass the bolts 6 through the connection holes of the butterfly connectors 4 on both sides and the penetration holes of the steel frame 1 web, and tighten the nuts 7;

[0050] S5, pour high-strength grouting material 8 into the operation holes of the left precast concrete 2 and the right precast concrete 3 to fill them. The high-strength grouting material 8 is a high-strength micro-expansion cement-based grouting material with a strength grade not less than C85.

[0051] The above is only a description of the preferred embodiment of the present invention, and is not intended to limit the scope of protection of the present invention. Obviously, any technician familiar with the field can easily think of replacements or changes to obtain other embodiments based on the above embodiments, which should all be included in the scope of protection of the present invention.

Claims

1. A weld-free assembled partially covered steel-concrete composite component, characterized in that: include: A steel frame body, the steel frame body is composed of an upper flange, a lower flange and a web connecting the upper and lower flanges, the web divides the space between the upper flange and the lower flange into two left and right cavities, the left and right cavities are used to place concrete precast parts, a reinforcement skeleton is embedded in the concrete precast parts, a part of the reinforcement skeleton extends out of the concrete precast parts and forms an upper tie hook that can be hooked with the upper flange and a lower tie hook that can be hooked with the lower flange at the upper and lower ends respectively; A group of prefabricated concrete parts which are arranged opposite to each other in the cavities at both sides of the web are fastened and connected to the web as a whole via fasteners.

2. The weld-free assembled partially clad steel-concrete composite member according to claim 1, characterized in that: The web is arranged vertically to the upper flange and the lower flange.

3. The weld-free assembled partially clad steel-concrete composite member according to claim 1, characterized in that: The main body of the reinforcement frame is a butterfly-shaped connecting piece, and the upper and lower wing tips of the butterfly wings on both sides of the butterfly structure respectively form the upper tie hook and the lower tie hook.

4. The weld-free assembled partially clad steel-concrete composite member according to claim 3, characterized in that: The butterfly structure of the butterfly connector is provided with connecting holes at the chest and abdomen, and a through hole is opened on the plate surface of the web facing the connecting holes. The fastener connects two relative concrete prefabricated parts preset in the cavities on both sides to the steel frame body through the connecting holes and the through holes.

5. The weld-free assembled partially clad steel-concrete composite member according to claim 1, 3 or 4, characterized in that: The reinforcement frame in the cavity on one side of the web is connected as a whole by a plurality of frame units via connecting pieces.

6. According to the welding-free assembled partially clad steel-concrete composite component of claim 5, the connecting member is one or more ribs embedded in the precast concrete component; the ribs are tied together with the skeleton unit of the rib skeleton.

7. A construction method for the weld-free assembled partially covered steel-concrete composite member as claimed in any one of claims 1 to 6, characterized in that: The steps include: S1, making reinforcement skeleton; S2. Place the reinforcement skeleton in the formwork, pour concrete, and respectively make concrete prefabricated parts to be placed in the cavities on both sides of the web; when pouring concrete, reserve operation holes at the fastener connection locations; S3. Drill penetration holes for fastener connection and fixing at equal intervals on the web of the steel frame body; S4, placing the precast concrete parts made in S2 in the cavities on the left and right sides of the web respectively, so that the upper tie hook and the lower tie hook of the reinforcement skeleton are hooked on the upper flange and the lower flange of the steel frame body respectively, and the precast concrete parts on both sides are connected and fastened to the web by fasteners; S5. Pour high-strength grouting material into the reserved operation holes of the precast concrete parts on both sides and fill them up.

8. The construction method according to claim 7, characterized in that: The reinforcement skeleton is an FRP part or a stainless steel part.

9. The construction method according to claim 7, characterized in that: The high-strength grouting material is a high-strength slightly expansive cement-based grouting material with a strength grade not less than C85.

10. The construction method according to claim 7, characterized in that: In S2, the internal contour of the template is adapted to the contour of the cavity between the flange and the web of the steel frame.

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