Connection node between double-web H-shaped steel and precast concrete slab

Abstract

The present invention discloses a double-web H-shaped steel and a connection node with a concrete precast panel. The key points of the technical solution are that it includes two flange plates and two webs, the two flange plates are parallel to each other, the two webs are parallel to each other, and the webs are vertically fixed between the two flange plates; the two webs and the two flange plates form a cavity. The H-shaped steel can reduce the amount of material used and has good integrity. The connection node of the double-web H-shaped steel and the concrete precast panel connects the precast panel to the steel structure through lateral connecting ribs, a first reinforcing connecting rod and post-cast concrete, which effectively improves the integrity and seismic resistance of the connection node.

Description

Technical Field

[0001] The invention relates to a steel section in a building, in particular to a connection node between a double-web H-shaped steel section and a concrete prefabricated slab. Background Art

[0002] At present, my country's construction industry is in a period of transformation and development, and prefabricated buildings are the development trend of the construction industry in the future. At present, H-shaped steel is often used as steel columns and steel beams in steel structure prefabricated buildings, but when H-shaped steel is used for long spans, the cross-sectional size is often increased to meet the force performance. In particular, when H-shaped steel is used as a steel beam, it is necessary to increase the thickness of the bottom flange plate and the height of the web to enhance its bending resistance, and increase the thickness of the web to enhance its shear and torsion resistance. However, this measure of increasing the cross-section and increasing the thickness will increase the weight of the H-shaped steel itself. When calculating the force, its deadweight needs to be taken into account, so it is necessary to further increase the cross-section. When the H-shaped steel size designed is used in the building, the utilization rate of the steel is low, resulting in material waste; in addition, the increase in the height of the web will cause the H-shaped steel to decrease in stability, and for H-shaped steel with a higher height, temporary reinforcement is required to prevent overturning during the installation process, which reduces construction efficiency and increases safety risks. Summary of the invention

[0003] An object of the present invention is to provide a double-web H-shaped steel, which can reduce material consumption and has good integrity.

[0004] Another object of the present invention is to provide a connection node between a double-web H-shaped steel and a concrete precast panel, which has a firm connection and good earthquake resistance.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A double-web H-shaped steel comprises two flange plates and two web plates, wherein the two flange plates are parallel to each other, the two web plates are parallel to each other, and the web plate is vertically fixed between the two flange plates; the two web plates and the two flange plates form a cavity.

[0007] By adopting the above technical solution, the double web has better torsional resistance and better overall rigidity than the H-shaped steel with a single web in the prior art; when the total thickness of the double web is the same as that of the single web, the same bending resistance can be achieved, and the setting of the double web can reduce the height of the web under the same conditions, thereby reducing the amount of steel used.

[0008] Preferably, at least one flange plate is provided with a plurality of through holes, and the through holes are located within the cavity.

[0009] By adopting the above technical solution, when pouring concrete at the construction site, the concrete can simultaneously enter the cavity of the double-web H-shaped steel, thereby improving the connection between the double-web H-shaped steel and the external concrete and making the overall structure more solid.

[0010] Preferably, it also includes a first reinforcing connecting rod; the two flange plates are the first flange plate and the second flange plate; the first reinforcing connecting rod passes through the through hole on the first flange plate, one end of the first reinforcing connecting rod is vertically fixed to the second flange plate, and the other end is exposed from the first flange plate.

[0011] By adopting the above technical solution, the connection between the double-web H-shaped steel and the external concrete is further strengthened.

[0012] Preferably, the web is a corrugated web, that is, the web is in a sinusoidal shape along the length direction of the H-shaped steel.

[0013] By adopting the above technical solution, the bending resistance, torsional resistance and buckling resistance of the double-web H-shaped steel are improved.

[0014] Preferably, the cavity is filled with concrete.

[0015] By adopting the above technical solution, the bending resistance, torsion resistance and fire resistance of the double-web H-shaped steel are improved, and the corrosion protection problem of the steel surface in the cavity is solved.

[0016] Preferably, prestressed steel bars or prestressed steel strands having the same length direction as the double web H-shaped steel are provided in the cavity near the flange plate.

[0017] By adopting the above technical solution, the bending resistance of the double-web H-shaped steel is enhanced, saving the investment in steel plate materials.

[0018] Preferably, a second reinforcing connecting rod is further included, and the second reinforcing connecting rod is located in the cavity and vertically fixed to the inner surface of the flange plate.

[0019] By adopting the above technical solution, the shear resistance of the concrete in the cavity is improved.

[0020] Preferably, a third reinforcing connecting rod is further included, and the third reinforcing connecting rod is vertically fixed to the outer surface of the flange plate.

[0021] By adopting the above technical solution, the connection between the double-web H-shaped steel and the external poured concrete is further improved.

[0022] A connection node between a double-web H-shaped steel and a concrete precast slab, comprising two precast slabs and the double-web H-shaped steel as claimed in the claim; the two precast slabs are located on the same side of the first flange plate of the double-web H-shaped steel, a first post-cast strip is formed between the two precast slabs, and concrete is poured in the first post-cast strip; lateral connecting ribs are arranged on the end surface of the precast slab close to the first post-cast strip, a part of the lateral connecting ribs is embedded in the precast slab, and a part of the lateral connecting ribs extends out of the precast slab; the lateral connecting ribs of the two precast slabs and the first reinforcing connecting rod of the double-web H-shaped steel are connected to each other.

[0023] By adopting the above technical solution, the integrity and earthquake resistance of the connection node are better.

[0024] Preferably, two ends of one of the flange plates are bent outward to form a clamping plate, and the double-web H-shaped steel is arranged on the top surface of the prefabricated wall panel, and the two clamping plates clamp the prefabricated wall panel.

[0025] By adopting the above technical solution, the structure strengthens the connection between the double-web H-shaped steel and the prefabricated wall panels, making the overall structure of the prefabricated wall panels, H-shaped steel and prefabricated floor slabs more solid.

[0026] Preferably, the outer side surfaces of the two flange plates or one of the flange plates are fixedly connected with connecting steel bars; the double-web H-shaped steel is arranged above the prefabricated wall panel; a second post-cast strip is arranged between the top surface of the prefabricated wall panel and the bottom surface of the double-web H-shaped steel; embedded steel bars are arranged on the top of the prefabricated wall panel, and the part of the embedded steel bars extending out of the prefabricated wall panel is fixedly connected with the connecting steel bars; through holes are opened on the upper and lower flange plates of the double-web H-shaped steel; the concrete in the cavity is connected with the concrete in the second post-cast strip through the through holes.

[0027] By adopting the above technical solution, the second post-cast strip strengthens the connection between the H-shaped steel and the prefabricated wall panel.

[0028] Preferably, the end of the connecting steel bar is provided with an enlarged head, and the embedded steel bar and the connecting steel bar are connected with a sleeve.

[0029] By adopting the above technical solution, the sleeve connection not only reduces the welding operation on site, but also makes the connection more reliable.

[0030] In summary, the present invention has the following beneficial effects:

[0031] 1. Double web H-shaped steel uses less steel, has light weight and high rigidity;

[0032] 2. Pouring concrete into the cavity further improves the rigidity and fire resistance of the double-web H-shaped steel, saves steel, and solves the problem of corrosion protection on the surface of the steel in the cavity;

[0033] 3. The setting of the first reinforcing connecting rod and the through hole on the flange plate strengthens the connection between the concrete in the cavity and the external concrete;

[0034] 4. Prestressed steel bars or prestressed steel strands will greatly improve the tensile strength, further save the amount of steel and reduce the deadweight;

[0035] 5. The setting of double-layer corrugated webs improves the bending, torsional and buckling resistance of double-web H-shaped steel;

[0036] 6. The connection nodes between the double-web H-shaped steel and the precast concrete slabs make the connection between the precast floor slabs and the steel structure as well as the precast wall panels more solid, making the overall building structure more earthquake-resistant. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is the overall schematic diagram of the double web H-beam;

[0038] Figure 2 It is a cross-sectional view of a double-web H-beam with a cavity filled with concrete;

[0039] Figure 3 It is a schematic diagram of a double-web H-shaped steel structure provided with a first reinforcing connecting rod and prestressed steel bars;

[0040] Figure 4 It is a schematic diagram of a double-web H-shaped steel structure provided with a second reinforcing connecting rod and a third reinforcing connecting rod; Figure 5 It is a schematic diagram of the structure of the double-belly corrugated plate H-beam (partially cut away);

[0041] Figure 6 It is an overall schematic diagram of the connection node between the double-web H-shaped steel and the concrete precast slab; Figure 7 It is the cross-section of the connection node after pouring concrete;

[0042] Figure 8 It is a schematic diagram of the structure of a double-web H-shaped steel with a clamping plate; Fig. 9 It is a structural schematic diagram of the double-web H-shaped steel and the prefabricated wall panel being clamped together;

[0043] Fig.10 It is a schematic diagram of the connection nodes between the double-web H-shaped steel and the prefabricated wall panels and prefabricated floor slabs; Fig.11 It is a schematic diagram of the structure of a double web H-shaped steel with connecting steel bars;

[0044] Fig.12 It is a schematic diagram of the structure in which the double-web H-shaped steel and the prefabricated wall panel are connected through the second post-cast strip; Fig.13 It is a schematic diagram of the connection node where the reinforcing connecting ribs are set;

[0045] Fig.14 It is a schematic diagram of the node in the second post-cast zone where the connecting steel bar and the embedded steel bar are connected by sleeves;

[0046] Fig.15 It is an overall schematic diagram of the connection node between the double-web H-shaped steel with the second post-cast strip and the prefabricated wall panels and prefabricated floor slabs;

[0047] Fig.16 It is a structural schematic diagram of a square tube with through holes;

[0048] Fig.17 It is a structural schematic diagram of the cylinder in the shrink-type steel bar connection sleeve; Fig.18 It is a schematic diagram of the end face of the shrinkage;

[0049] Fig.19 It is a schematic diagram of the matching between the sleeve and the connecting steel bar;

[0050] Fig. 20 It is a schematic diagram of the connection relationship between the shrink-type steel bar connection sleeve and the prefabricated column; Fig.21 It is a schematic diagram of the structure in which the sleeve is connected to two steel bars in a vertical state;

[0051] Fig. 22 It is a schematic diagram of the structure extending outward into the card-type sleeve;

[0052] Fig.23 It is an assembly diagram of the externally extending clip-type sleeve and the connecting steel bar.

[0053] In the figure, 1, flange plate; 11, first flange plate; 12, second flange plate; 13, through hole; 14, snap-in plate; 15, connecting steel bar; 16, reinforcing connecting rib; 2, web plate; 3, cavity; 41, first reinforcing connecting rod; 42, second reinforcing connecting rod; 43, third reinforcing connecting rod; 5, prestressed steel bar; 6, cylinder; 61, necking; 611, transition cone surface; 62, grouting hole; 64, barrier element; 65, snap-in block; 651, snap-in hole; 66, spring piece; 7, precast wall panel; 71, embedded steel bar; 8, corrugated web; 9, precast floor slab; 91, lateral connecting rib; 101, sleeve; 102, connecting rib; 103, enlarged head; 104, first post-cast strip; 105, second post-cast strip. DETAILED DESCRIPTION

[0054] The present invention is further described in detail below in conjunction with the accompanying drawings. The same parts are represented by the same reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper", "lower", "bottom" and "top" used in the following description refer to directions in the accompanying drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0055] Embodiment 1:

[0056] like Figure 1As shown, a double-web H-shaped steel comprises two flange plates 1 and two web plates 2. The two flange plates 1 are parallel to each other, the two web plates 2 are parallel to each other, and the web plates 2 are vertically fixed between the two flange plates 1; the two web plates 2 and the two flange plates 1 form a cavity 3. The two flange plates 1 are a first flange plate 11 and a second flange plate 12. Compared with the H-shaped steel with a single web plate 2 in the prior art, the double web plate 2 has better torsion resistance and better overall rigidity. When the total thickness of the double-layer web plate 2 is the same as that of the single-layer web plate 2, the same bending resistance can be achieved, and the setting of the double-layer web plate 2 can reduce the height of the web plate 2 under the same conditions, thereby reducing the amount of steel used.

[0057] like Figure 2 As shown, further, concrete is poured into the cavity 3. The concrete poured into the cavity 3 makes the double-web H-shaped steel have the performance of steel tube concrete, which not only improves the bending and torsion resistance of the double-web H-shaped steel, but also solves the corrosion problem of the steel surface in the cavity 3. In addition, the double-web H-shaped steel poured with concrete has better fire resistance than the existing H-shaped steel, and prolongs the fire resistance time.

[0058] The double-web H-shaped steel is directly processed in the factory, and the concrete in the cavity 3 can be directly poured in the factory or at the construction site.

[0059] Because when the double-web H-shaped steel is used as a steel beam or steel column, concrete is often poured on the side of one flange plate 1, or concrete is poured around it. Therefore, in order to facilitate the pouring of concrete at the construction site, the concrete can be simultaneously poured into the cavity 3 of the double-web H-shaped steel. Therefore, Figure 1 As shown, a plurality of through holes 13 are provided on at least one flange plate 1 , and the through holes 13 are located within the cavity 3 .

[0060] The provision of the through holes 13 enables the concrete in the cavity 3 of the double-web H-shaped steel to be connected to the concrete outside thereof as a whole, further improving the connection between the double-web H-shaped steel and the external concrete, making the overall structure more solid.

[0061] like Figure 3 As shown, in order to further strengthen the connection between the double web H-shaped steel and the external concrete, a first reinforcing connecting rod 41 may be provided; the first reinforcing connecting rod 41 passes through the through hole 13 on the first flange plate 11, one end of the first reinforcing connecting rod 41 is vertically fixed to the second flange plate 12, and the other end is exposed from the first flange plate 11. The first reinforcing connecting rod 41 may be an ordinary steel bar or a bolt. The first reinforcing connecting rod 41 is preferably processed into one piece with the double web H-shaped steel in a factory.

[0062] like Figure 3As shown, in order to further enhance the bending resistance of the double web H-shaped steel, a prestressed steel bar 5 or prestressed steel strand with the same length direction as the double web H-shaped steel can be arranged in the cavity 3 near the flange plate 1. The prestressed steel bar 5 or prestressed steel strand is also processed into one piece with the double web H-shaped steel in the factory. The anchoring of the prestressed steel bar 5 or steel strand is divided into the following two situations:

[0063] If the cavity 3 is not filled with concrete before the double-web H-shaped steel leaves the factory, end plates may be provided at both ends of the double-web H-shaped steel, and the prestressed steel bars 5 or prestressed steel strands are anchored on the end plates.

[0064] If the cavity 3 has been poured with concrete before the double-web H-shaped steel leaves the factory, the two ends of the prestressed steel bars 5 or steel strands are tensioned in the factory first, and then the concrete is poured. When the concrete strength reaches the requirement, the tensioning devices at both ends are released to make the prestressed steel bars 5 or steel strands form a whole with the concrete in the cavity 3.

[0065] like Figure 4 As shown, in order to improve the shear resistance of the concrete in the cavity 3 , a second reinforcing connecting rod 42 is arranged in the cavity 3 . The second reinforcing connecting rod 42 may be a stud vertically welded to the inner surface of the flange plate 1 .

[0066] like Figure 4 As shown, in order to improve the connection between the double-web H-shaped steel and the external poured concrete, a third reinforcing connecting rod 43 is vertically welded on the outer surface of the flange plate 1. The third reinforcing connecting rod 43 can be a steel bar or a bolt.

[0067] like Figure 5 As shown, preferably, the web 2 can be a corrugated web 8, that is, the web 2 is in a sinusoidal shape along the length direction of the H-beam, and the two corrugated webs 8 can be symmetrically arranged. This arrangement can further improve the bending, torsion and buckling resistance of the double-web H-beam.

[0068] Embodiment 2:

[0069] like Figure 6 and Figure 7 As shown, a connection node between a double-web H-shaped steel and a concrete precast slab comprises two precast slabs 9 and a double-web H-shaped steel; the double-web H-shaped steel comprises a through hole 13 and a first reinforcing connecting rod 41; the two precast slabs 9 are located on the same side of the first flange plate 11 of the double-web H-shaped steel, a first post-casting strip 104 is formed between the two precast slabs 9, and concrete is poured in the first post-casting strip 104; a lateral connecting rib 91 is arranged on the end face of the precast slab 9 close to the first post-casting strip 104, a part of the lateral connecting rib 91 is embedded in the precast slab 9, and a part of the lateral connecting rib 91 extends out of the precast slab 9; the lateral connecting rib 91 of the two precast slabs 9 and the first reinforcing connecting rod 41 of the double-web H-shaped steel are connected to each other.

[0070] In existing prefabricated buildings, the connection nodes between prefabricated panels and steel structures are generally connected by bolts or partial welding, which has disadvantages such as loose connection, poor seismic resistance and poor integrity. In this connection node, the prefabricated floor slabs 9 are connected by lateral connecting ribs 91 and post-cast concrete, and the prefabricated floor slabs 9 and the double-web H-shaped steel are connected by a first reinforcing connecting rod 41 and post-cast concrete, which effectively improves the integrity and seismic resistance of the connection node.

[0071] It should be pointed out that the connection node is not limited to the technical measures mentioned in the above part of the embodiment, and the prestressed steel bar 5, the second reinforcing connecting rod 42 and the third reinforcing connecting rod 43 in the first embodiment can also be used in combination.

[0072] Embodiment three:

[0073] like Figure 8 As shown, a double-web H-shaped steel is different from the first embodiment in that two ends of one flange plate 1 are bent outward to form a clamping plate 14.

[0074] like Fig. 9 As shown, a connection node between a double-web H-shaped steel and a concrete precast panel includes a precast wall panel 7 and the double-web H-shaped steel described in this embodiment. The double-web H-shaped steel is arranged on the top surface of the precast wall panel 7, and two clamping plates 14 clamp the precast wall panel 7.

[0075] This structure strengthens the connection between the double-web H-shaped steel and the prefabricated wall panel 7, making the structure more solid.

[0076] like Fig.10 As shown, the two structures in the second embodiment and this embodiment can also be combined to form a connection node among the prefabricated wall panel 7, the double-web H-shaped steel and the prefabricated floor slab 9, so that the building is more solid and has better earthquake resistance.

[0077] Embodiment 4:

[0078] The difference from the third embodiment is that, Fig.11 As shown, the bottom of the steel beam is not provided with a clamping plate 14, but a connecting steel bar 15 is vertically provided. Fig.12 As shown, a second post-casting strip 105 is arranged between the top surface of the prefabricated wall panel 7 and the bottom surface of the double-web H-shaped steel; a pre-embedded steel bar 71 is arranged on the top of the prefabricated wall panel 7, and the part of the pre-embedded steel bar 71 extending out of the prefabricated wall panel 7 is fixedly connected to the connecting steel bar 15, which can be welded. In order to facilitate the concrete pouring of the second post-casting strip 105, through holes 13 are opened on the upper and lower flange plates 1 of the double-web H-shaped steel, and the concrete in the cavity is connected to the concrete of the second post-casting strip 105 through the through holes 13.

[0079] Furthermore, if Fig.13As shown, a reinforcing connecting rib 16 is vertically provided through the upper and lower through holes 13 , and the reinforcing connecting rib 16 may be a bolt or an ordinary steel bar.

[0080] like Fig.14 As shown, the end of the embedded steel bar 71 extending out of the prefabricated wall panel 7 is provided with an enlarged head 103, and the end of the connecting steel bar 15 is provided with an enlarged head 103 (not shown in the figure), and the embedded steel bar 71 and the connecting steel bar 15 are connected with a sleeve 101. (The structure and connection method of the enlarged head 103 and the sleeve 101 are introduced in the last paragraph of the article)

[0081] Similarly, if Fig.15 As shown, the two structures in the second embodiment and this embodiment are combined to form a connection node among the prefabricated wall panel 7, the double-web H-shaped steel and the prefabricated floor slab 9, so that the building is more solid and has better earthquake resistance.

[0082] In addition, if Fig.16 As shown, the double-web H-shaped steel mentioned above can be replaced by a square steel tube, which can also achieve the corresponding effect. The two vertical tube walls of the square steel tube can be used as two webs 2.

[0083] Introduction to sleeve structure and its connection method:

[0084] The sleeve 101 can be a shrink-fitting steel bar sleeve or an outward extending clamping piece sleeve.

[0085] (Since the connecting steel bars 15 and the embedded steel bars 71 mentioned above are both provided with enlarged heads 103, the connecting steel bars 102 mentioned below represent the above two types of steel bars for description. The components on both sides of the sleeve 101 are described by taking the prefabricated wall panel 7 as an example)

[0086] Shrink type steel sleeve:

[0087] like Fig.17 As shown, the shrinkage type steel sleeve includes a cylinder 6 and a shrinkage 61 integrally connected to both ends of the cylinder 6. The cylinder 6 is provided with a plurality of evenly distributed grouting holes 62 to facilitate the cement slurry to flow into the cylinder 6; Fig.18 The constriction 61 is a circular opening, the inner wall of the constriction 61 is a conical surface, and the larger end of the conical surface faces the inside of the cylinder 6; Fig.19 The connection structure of the shrinkage type steel bar sleeve is composed of a connecting rib 102 and a cylinder 6. One end of the connecting rib 102 is embedded and fixedly connected to the inside of the prefabricated wall panel 7, and the other end is exposed outside the prefabricated wall panel 7 and is integrally connected with an enlarged head 103 at the end away from the prefabricated wall panel 7. The radial dimension of the outer wall of the enlarged head 103 is larger than the radial dimension of the outer wall of the connecting rib 102 and smaller than the radial dimension of the inner wall of the shrinkage 61. The enlarged head 103 can extend into the interior of the cylinder 6 from the shrinkage 61.

[0088] like Fig. 20As shown, after the cement slurry flows into the cylinder 6 from the grouting hole 62 and solidifies to form concrete, the enlarged head 103 can be fixed inside the cylinder 6 to limit the connecting ribs 102 at both ends of the cylinder 6 from moving away from each other and pulling out the cylinder 6, thereby Fig. 20 The rectangular block structure at one end of the middle connecting rib 102 away from the cylinder 6 is a schematic diagram of the prefabricated wall panel 7) to improve the connection strength between the two prefabricated wall panels 7. The end of the enlarged head 103 close to the connecting rib 102 is in the shape of a truncated cone, and the end of the enlarged head 103 close to the prefabricated wall panel 7 is smaller than the other end; for the convenience of description, the conical surface of the necking 61 is defined as a transition conical surface 611, and the necking 61 and the end of the cylinder 6 are integrally connected through the transition conical surface 611. After the connecting rib 102 is subjected to the force in the direction of pulling out the cylinder 6, the truncated cone squeezes the concrete, and the concrete will squeeze the force (such as Fig. 20 The direction indicated by the arrow F in the figure is a schematic diagram of the direction of the force) is transmitted to the transition conical surface 611. The reaction force generated by the transition conical surface 611 has a radial component on the enlarged head 103, and the enlarged head 103 is pressed radially. Therefore, the transition conical surface 611 can make the cylinder 6 and the concrete inside bear a larger load, thereby improving the connection strength between the connecting rib 102 and the enlarged head 103 and the cylinder 6.

[0089] Compared with the existing grouting sleeve, this sleeve does not require a separate grouting operation. Instead, when pouring concrete, the concrete slurry enters the cylinder 6 to complete the connection of the connecting ribs 102. The operation is more convenient and does not require special grouting materials, saving costs. In addition, since this solution relies on pressure transmission, the connection is more reliable than the grouting sleeve that relies on the bonding and bite between the grouting material and the steel bar.

[0090] The shape of the constriction 61 can be circular, square, long strip, oval or other shapes, and the cross section of the enlarged head 103 is adapted to the shape of the constriction 61. In order to effectively transmit the pressure of the enlarged head 103 to the cylinder 6 through the concrete, the size of the constriction 61 can be 1-5 mm larger than the size of the enlarged head 103, preferably 2-3 mm.

[0091] like Fig.21 As shown, when two vertical steel bars are connected, in order to more conveniently temporarily fix the sleeve 101 at the joint position of the two connecting bars 102 before pouring concrete, so as not to slip off, a blocking element 64 is fixedly connected to the middle position of the inner wall of the cylinder 6 to prevent the enlarged head 103 from penetrating the sleeve 101. The blocking element 64 can be a disc plate located in the middle of the cylinder 6. Further, in order to allow the cement slurry to flow freely in the cylinder 6, the blocking element 64 is set in a hollow ring shape, and the inner diameter of the ring is smaller than the diameter of the enlarged head 103. Alternatively, the blocking element 64 can also be a rod member arranged along the radial direction of the cylinder 6.

[0092] Extending into the card-type sleeve:

[0093] like Fig. 22 and Fig.23 As shown, the externally extending card-type sleeve includes a cylinder 6, a card block 65, and a spring 66. Both ends of the cylinder 6 are provided with card holes 651 for the card block 65 to be inserted, and the cylinder 6 is provided with a grouting hole 62. One end of the spring 66 is connected to the outer side of the cylinder 6.

[0094] The other end of the spring piece 66 is fixedly connected to one end of the clamping block 65 located outside the cylinder 6.

[0095] One end of the connecting rib 102 is fixedly connected with an enlarged head 103, the radial dimension of which is larger than that of the connecting rib 102, and the enlarged head 103 can be inserted into the cylinder 6 from the port of the cylinder 6. During the insertion process, the enlarged head 103 pushes the clamping block 65 to move in a direction away from the central axis of the cylinder 6, driving the spring sheet 66 to undergo elastic deformation. After the enlarged head 103 passes over the clamping block 65, the spring sheet 66 gradually recovers its deformation and is inserted into the cylinder 6 to reset, thereby limiting the enlarged head 103 from being pulled out of the cylinder 6.

[0096] When concrete is poured into the post-casting strip around the cylinder 6, cement slurry can flow into the cylinder 6 from the two ports of the cylinder 6 and the grouting holes 62. After the cement slurry solidifies, solid concrete is formed, which fixes the connecting bars 102 inside the cylinder 6, thereby realizing the connection of the two connecting bars 102.

[0097] In addition, it should be pointed out that the sleeve can adopt the four sleeve-related utility model patents submitted by the applicant on April 8, 2018, with application numbers 201810306670.4, 201810307419.X, 201810307420.2 and 201810307967.2 respectively.

[0098] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A connection node between a double-web H-shaped steel and a precast concrete slab, characterized in that: The double-web H-shaped steel comprises two flange plates (1) and two web plates (2), wherein the two flange plates (1) are parallel to each other, the two web plates (2) are parallel to each other, and the web plate (2) is vertically fixed between the two flange plates (1); the two web plates (2) and the two flange plates (1) form a cavity (3), and concrete is poured into the cavity (3); at least one flange plate (1) is provided with a plurality of through holes (13), and the through holes (13) are located within the cavity (3); The double-web H-shaped steel comprises a first reinforcing connecting rod (41); the two flange plates (1) are a first flange plate (11) and a second flange plate (12); the first reinforcing connecting rod (41) passes through a through hole (13) on the first flange plate (11); The connection node comprises two precast floor slabs (9), the two precast floor slabs (9) are located on the same side of the first flange plate (11) of the double-web H-shaped steel, a first post-cast strip (104) is formed between the two precast floor slabs (9), and concrete is poured in the first post-cast strip (104); a lateral connecting rib (91) is arranged on the end surface of the precast floor slab (9) close to the first post-cast strip (104), a part of the lateral connecting rib (91) is pre-buried in the precast floor slab (9), and a part of the lateral connecting rib (91) protrudes out of the precast floor slab (9); the lateral connecting ribs (91) of the two precast floor slabs (9) and the first reinforcing connecting rod (41) of the double-web H-shaped steel are connected to each other; The connection node also includes a prefabricated wall panel (7), the outer side surfaces of the two flange panels (1) or one of the flange panels (1) are fixedly connected with connecting steel bars (15); the double-web H-shaped steel is arranged above the prefabricated wall panel (7); a second post-cast strip (105) is arranged between the top surface of the prefabricated wall panel (7) and the bottom surface of the double-web H-shaped steel; embedded steel bars (71) are arranged on the top of the prefabricated wall panel (7), and the part of the embedded steel bars (71) extending out of the prefabricated wall panel is fixedly connected with the connecting steel bars (15); through holes (13) are provided on the upper and lower flange panels (1) of the double-web H-shaped steel, and the first reinforcing connecting rod (41) vertically penetrates the upper and lower through holes (13), and the through holes (13) surround the circumference of the first reinforcing connecting rod (41); and the concrete in the cavity (3) is connected with the concrete in the second post-cast strip (105) through the through holes (13).

2. The connection node between a double-web H-shaped steel and a precast concrete slab according to claim 1, characterized in that: The web (2) is a corrugated web (8), that is, the web (2) is in the shape of a sine curve along the length direction of the H-shaped steel.

3. The connection node between a double-web H-shaped steel and a precast concrete slab according to claim 1, characterized in that: Prestressed steel bars (5) or prestressed steel strands having the same length direction as the double web H-shaped steel are arranged in the cavity (3) near the flange plate (1).

4. The connection node between a double-web H-shaped steel and a precast concrete slab according to claim 1, characterized in that: It also includes a second reinforcing connecting rod (42), which is located in the cavity (3) and is vertically fixed to the inner surface of the flange plate (1).

5. The connection node between a double-web H-shaped steel and a precast concrete slab according to claim 1, characterized in that: It also includes a third reinforcing connecting rod (43), which is vertically fixed to the outer surface of the flange plate (1).

6. The connection node between a double-web H-shaped steel and a precast concrete slab according to claim 1, characterized in that: An enlarged head (103) is provided at the end of the connecting steel bar (15).

7. The connection node between the double-web H-shaped steel and the precast concrete slab according to claim 1, characterized in that: The end of the embedded steel bar (71) extending out of the prefabricated wall panel (7) is provided with an enlarged head (103), the end of the connecting steel bar is provided with an enlarged head (103), and the embedded steel bar (71) and the connecting steel bar (15) are connected by a sleeve (101).

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