A prefabricated stiffened beam structure and method

Abstract

The present invention relates to the technical field of construction engineering, and discloses a precast stiffened beam structure and method, including an I-beam, a first precast slab, a second precast slab, a flat plate, anchor bars, anchor bolts and insertion plates. After the flat plate of the present invention is subjected to pressure, at this time, the flat plate not only transmits force through the anchor bars, but also has an I-beam arranged inside the flat plate, and at this time, the I-beam will also transmit force, thereby reducing the possibility of stress concentration. And when the stress propagates into the first precast slab and the second precast slab, the grouting cavity between the first precast slab and the second precast slab is grouted synchronously during grouting, so the first precast slab and the second precast slab will be connected more tightly. And there are anchor bolts connected between the first precast slab and the second precast slab. Therefore, when subjected to external extrusion, the concrete between the first precast slab and the second precast slab is stable, which can reduce the possibility of cracks, so the bearing capacity of the building can be improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering, and specifically relates to a precast stiff beam structure and method. Background Art

[0002] In the long-term engineering practice application, many insurmountable drawbacks have gradually emerged in traditional reinforced concrete beams.

[0003] Under the action of vertical loads, especially in high-rise buildings or heavy industrial buildings, the loads transferred from the floor slab to the beam are large and complexly distributed. The existing simple laying connection method only relies on a certain anchorage length of the bottom reinforcement of the floor slab on the beam to achieve force transfer, which is difficult to ensure uniform and effective force transfer, easily causes local stress concentration, leads to premature cracks at the connection part between the beam and the floor slab, weakens the structural integrity, and affects the bearing capacity of the building.

[0004] In view of this, the present invention is specifically proposed. Summary of the Invention

[0005] To solve the technical problem that under the action of vertical loads, especially in high-rise buildings or heavy industrial buildings, the loads transferred from the floor slab to the beam are large and complexly distributed. The existing simple laying connection method only relies on a certain anchorage length of the bottom reinforcement of the floor slab on the beam to achieve force transfer, which is difficult to ensure uniform and effective force transfer, easily causes local stress concentration, leads to premature cracks at the connection part between the beam and the floor slab, weakens the structural integrity, and affects the bearing capacity of the building, the basic concept of the technical solution adopted by the present invention is:

[0006] A precast stiff beam structure includes an I-beam, a first precast slab, a second precast slab, a flat plate, anchor bars, anchor bolts, and a plug plate.

[0007] The first precast slab is L-shaped, the bottom of the I-beam is lapped on the first precast slab, and the height of the I-beam is higher than that of the first precast slab;

[0008] The second precast slab is Z-shaped, the side wall of the first precast slab is closely attached to the side wall of the second precast slab, the cavity formed by the first precast slab and the second precast slab is U-shaped, and grout is poured inside the cavity. The height of the second precast slab is higher than that of the first precast slab;

[0009] The flat plate is placed above the first precast slab and the second precast slab, and the first precast slab and the second precast slab are integrally cast and connected with the flat plate. The inner cavity of the flat plate is integrally cast with the upper surface of the I-beam;

[0010] Anchor bars are integrally cast inside the first precast slab and the second precast slab, and the other ends of the anchor bars are cast in the flat plate;

[0011] The anchor screw horizontally penetrates through the first precast slab and the second precast slab, and an anchor nut is installed at the end of the anchor screw;

[0012] A grouting cavity is formed at the bottom of the first precast slab. The insertion plate is movably inserted into the grouting cavity. One end of the insertion plate is provided with a connecting plate, and the connecting plate is attached to the surface of the anchor nut. The other end of the insertion plate is provided with a synchronous plate. A rocker arm is rotatably installed on the synchronous plate. A sealing block is installed at the end of the rocker arm. The sealing block is slidably arranged on an inlet formed on the surface of the first precast slab, and the inlet is communicated with the grouting cavity. A sliding plate is installed on the side wall of the sealing block, and a clamping block is installed on the sliding plate. The clamping block corresponds to a clamping groove formed on the side wall of the second precast slab.

[0013] As a preferred embodiment of the present invention, through holes are formed on the surface of the I-beam, and the through holes are used to communicate the chambers on both sides of the I-beam. A guiding groove is formed at the bottom of the first precast slab. The size of the guiding groove is adapted to the bottom size of the I-beam, and the I-beam is lapped on the guiding groove. The I-beam is made of Q355B steel.

[0014] As a preferred embodiment of the present invention, the upper surfaces of the first precast slab and the second precast slab are flush with each other. A liquid injection port is formed on the first precast slab, and the liquid injection port is communicated with the cavity formed by the first precast slab and the second precast slab. Both the first precast slab and the second precast slab are precast with concrete.

[0015] As a preferred embodiment of the present invention, the bottom of the second precast slab is lower than the bottom of the first precast slab. A drip line is arranged at the bottom of the second precast slab. The opposite surfaces of the first precast slab and the second precast slab are adhesively bonded to each other.

[0016] As a preferred embodiment of the present invention, a bent head is arranged at the top of the anchor bar, and the bent head is cast in the slab. Binding wires are installed between adjacent anchor bars.

[0017] As a preferred embodiment of the present invention, a sliding sleeve is slidably sleeved on the anchor screw. The sliding sleeve is arranged between the anchor nut and the first precast slab. The sliding sleeve is connected to the connecting plate. An inner groove is formed on the back surface of the first precast slab, and the size of the inner groove is adapted to the size of the sliding sleeve and the connecting plate.

[0018] As a preferred embodiment of the present invention, an insertion rod is installed at the end of the insertion plate located inside the grouting cavity. The end of the insertion rod is horizontally corresponding to a jack formed on the surface of the second precast slab. The size of the insertion rod is adapted to the size of the jack, and the surface of the jack is chamfered.

[0019] As a preferred embodiment of the present invention, a fixing block is installed on the grouting cavity, a tension spring is installed on the fixing block, the other end of the tension spring is installed on the side wall of the synchronous plate, and the stretching direction of the tension spring and the moving direction of the inserting plate are on the same straight line.

[0020] As a preferred embodiment of the present invention, the rocker arm is in an inclined state, the height of the end of the rocker arm closer to the second precast slab is higher than the height of the other end, a limiting rod is movably inserted through the sealing block, one end of the limiting rod is fixedly installed on the side wall of the grouting cavity, a chute is opened on the side wall of the second precast slab, the clamping groove is opened on the end face of the chute, and the sliding plate is slidably arranged on the chute.

[0021] As a preferred embodiment of the present invention, a construction method of a precast stiffened beam structure is as follows:

[0022] Step 1: Prepare the first precast slab and the second precast slab, pour one end of the anchor bar on the surfaces of the first precast slab and the second precast slab, and the other end of the anchor bar is exposed outside.

[0023] Step 2: Flush-joint the first precast slab and the second precast slab, place an I-beam in the chamber surrounded by the first precast slab and the second precast slab, insert an anchor bolt between the first precast slab and the second precast slab, and perform a locking operation by rotating the anchor nut on the anchor bolt.

[0024] Step 3: During the rotation of the anchor nut, the connecting plate is extruded to move, the connecting plate drives the inserting plate to move, the synchronous plate on the inserting plate drives the sealing block to move towards the center through the rocker arm, and finally the clamping block on the sealing block is inserted into the clamping groove of the second precast slab, finally completing the tight connection of the first precast slab and the second precast slab, and after the sealing block moves, the sealing block slides out from the inlet of the grouting cavity and opens the inlet.

[0025] Step 4: Partition plates are arranged at both ends of the space surrounded by the first precast slab and the second precast slab, and then grouting operation is carried out on the internal chamber. Part of the slurry will flow along the inlet to the grouting cavity, so that the first precast slab and the second precast slab are connected together, and the other part of the slurry will fill the chamber surrounded by the first precast slab and the second precast slab. After the slurry cools and solidifies, the partition plates are disassembled. At this time, the first precast slab, the second precast slab and the I-beam are tightly connected together.

[0026] Step 5: Install a casting mold on the structure cast in Step 4, and grout inside. After grouting, a flat plate is formed. At this time, the flat plate is connected into a whole with the I-beam, the first precast slab, the second precast slab and the anchor bar.

[0027] The present invention has the following beneficial effects compared with the prior art:

[0028] After the flat plate of the present invention is subjected to pressure, the flat plate not only transmits force through the anchor bars at this time, but also I-beams are arranged inside the flat plate, and the I-beams will also transmit force at this time, thereby reducing the possibility of stress concentration. And when the stress propagates into the first precast slab and the second precast slab, the grouting cavity between the first precast slab and the second precast slab is grouted synchronously during grouting, so the first precast slab and the second precast slab will be connected more tightly. And there are anchor bolts connecting the first precast slab and the second precast slab. Therefore, when subjected to external extrusion, the concrete between the first precast slab and the second precast slab is stable, and the possibility of cracks can be reduced. Therefore, the bearing capacity of the building can be improved as a whole.

[0029] The following further describes in detail the specific implementation manners of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In the drawings:

[0031] Figure 1 is a structural schematic diagram of a precast stiffened beam structure Figure 1 ;

[0032] Figure 2 is a structural schematic diagram of a precast stiffened beam structure Figure 2 ;

[0033] Figure 3 is a cross-sectional view of the flat plate of a precast stiffened beam structure;

[0034] Figure 4 is a structural schematic diagram of a precast stiffened beam structure after pouring;

[0035] Figure 5 is a structural diagram of the installation position of the anchor bars of a precast stiffened beam structure;

[0036] Figure 6 is a structural connection diagram of the anchor bars of a precast stiffened beam structure;

[0037] Figure 7 is a three-dimensional view of the second precast slab of a precast stiffened beam structure;

[0038] Figure 8 is a cross-sectional view of the connection between the first precast slab and the second precast slab of a precast stiffened beam structure.

[0039] In the figure: 1, I-beam; 11, through hole; 2, first precast slab; 21, guiding groove; 211, liquid injection port; 3, second precast slab; 31, drip line; 4, flat plate; 5, anchor bar; 51, bent head; 52, binding wire; 6, anchor bolt; 61, anchor nut; 7, plug board; 71, connecting plate; 711, sliding sleeve; 712, inner groove; 72, plug rod; 721, jack; 73, synchronous plate; 731, fixing block; 732, tension spring; 74, sealing block; 741, limiting rod; 742, rocker arm; 743, sliding plate; 744, clamping block; 745, clamping groove; 746, sliding groove; 75, grouting cavity; 751, inlet. Detailed implementation mode

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0041] Embodiment 1:

[0042] As Figures 1 to 8 shown, a precast stiffened beam structure includes an I-beam 1, a first precast slab 2, a second precast slab 3, a flat plate 4, an anchor bar 5, an anchor bolt 6 and a plug board 7.

[0043] The first precast slab 2 is L-shaped, the bottom of the I-beam 1 is lapped on the first precast slab 2, and the height of the I-beam 1 is higher than that of the first precast slab 2; the second precast slab 3 is 1-shaped, the side wall of the first precast slab 2 is closely attached to the side wall of the second precast slab 3, the cavity formed by the first precast slab 2 and the second precast slab 3 is U-shaped, and grout is poured inside the cavity. The height of the second precast slab 3 is higher than that of the first precast slab; the flat plate 4 is placed above the first precast slab 2 and the second precast slab 3, and the first precast slab 2 and the second precast slab 3 are integrally cast and connected with the flat plate 4, and the inner cavity of the flat plate 4 is integrally cast with the upper surface of the I-beam 1; Anchor bars 5 are integrally cast inside the first precast slab 2 and the second precast slab 3, and the other ends of the anchor bars 5 are cast in the flat plate 4; The anchor bolts 6 horizontally penetrate through the first precast slab 2 and the second precast slab 3, and anchor nuts 61 are installed at the ends of the anchor bolts 6;

[0044] A grouting cavity 75 is formed at the bottom of the first precast slab 2. The insertion plate 7 is movably inserted into the grouting cavity 75. One end of the insertion plate 7 is provided with a connecting plate 71, and the connecting plate 71 is attached to the surface of the anchoring nut 61. The other end of the insertion plate 7 is provided with a synchronous plate 73. A rocker arm 742 is rotatably installed on the synchronous plate 73. A sealing block 74 is installed at the end of the rocker arm 742. The sealing block 74 is slidably arranged on an inlet 751 formed on the surface of the first precast slab 2, and the inlet 751 is communicated with the grouting cavity 75. A sliding plate 743 is installed on the side wall of the sealing block 74, and a clamping block 744 is installed on the sliding plate 743. The clamping block 744 corresponds to a clamping groove 745 formed on the side wall of the second precast slab 3.

[0045] After the flat plate 4 of the present invention is subjected to pressure, at this time, the flat plate 4 not only transmits force through the anchor bars 5, but also an I-beam 1 is arranged inside the flat plate. At this time, the I-beam 1 will also transmit force, thereby reducing the possibility of stress concentration. And when the stress propagates into the first precast slab 2 and the second precast slab 3, the grouting cavity 75 between the first precast slab 2 and the second precast slab 3 is grouted synchronously during grouting. Therefore, the first precast slab 2 and the second precast slab 3 will be connected more tightly. And an anchoring screw rod 6 is connected between the first precast slab 2 and the second precast slab 3. Therefore, when subjected to external extrusion, the concrete between the first precast slab 2 and the second precast slab 3 is stable, which can reduce the possibility of cracks. Therefore, overall, the bearing capacity of the building can be improved.

[0046] As Figures 1 to 8 shown, in the specific embodiment, through holes 11 are formed on the surface of the I-beam 1. The through holes 11 are used to communicate the chambers on both sides of the I-beam 1. The through holes 11 facilitate the flow of the grouting liquid. A guiding groove 21 is formed at the bottom of the first precast slab 2. The size of the guiding groove 21 is adapted to the bottom size of the I-beam 1, and the I-beam 1 is lapped on the guiding groove 21. The guiding groove 21 facilitates the installation of the I-beam 1. The I-beam is made of Q355B steel. The material of the I-beam 1 ensures that it has sufficient structural strength.

[0047] As Figures 1 to 8 shown, further, the upper surfaces of the first precast slab 2 and the second precast slab 3 are flush with each other. A liquid injection port 211 is formed on the first precast slab 2. The liquid injection port 211 is communicated with the cavity formed by the first precast slab 2 and the second precast slab 3. Both the first precast slab 2 and the second precast slab 3 are precast with concrete. The liquid injection port 211 facilitates the injection of grouting liquid into the first precast slab 2 and the second precast slab 3.

[0048] Embodiment 2:

[0049] Based on Embodiment 1, the difference from this embodiment is: As Figures 1 to 8As shown in the figure, the bottom of the second precast slab 3 is lower than that of the first precast slab 2. A drip line 31 is provided at the bottom of the second precast slab 3. The drip line prevents water flow such as rainwater from entering the building interior and protects the wall from erosion and damage. The opposite surfaces of the first precast slab 2 and the second precast slab 3 are adhesively bonded to achieve the purpose of preliminary fixation.

[0050] As Figures 1 to 8 shown in the figure, in the specific implementation, a bent head 51 is provided at the top of the anchor bar 5. The bent head 51 can increase the connection area and improve the structural strength of the connection part. The bent head 51 is cast and set in the flat plate 4. Binding wires 52 are installed between adjacent anchor bars 5. The binding wires 52 facilitate controlling the distance between the anchor bars 5, making the connection part have a relatively high structural strength.

[0051] As Figures 1 to 8 shown in the figure, further, a sliding sleeve 711 is sleeved on the anchor bolt 6. The sliding sleeve 711 is placed between the anchor nut 61 and the first precast slab 2. The sliding sleeve 711 is connected to the connecting plate 71. An inner groove 712 is formed on the back surface of the first precast slab 2. The dimensions of the inner groove 712 are adapted to those of the sliding sleeve 711 and the connecting plate 71. During the rotation of the anchor nut 61, the anchor nut 61 can squeeze the sliding sleeve 711. At this time, the sliding sleeve 711 moves along the anchor bolt 6, and the sliding sleeve 711 drives the connecting plate 71 to move. Finally, the connecting plate 71 can be embedded into the inner groove 712, reducing the occupied space.

[0052] Example 3:

[0053] Based on Example 2, the difference from this example is that as Figures 1 to 8 shown in the figure, a plug rod 72 is installed at the end of the plug board 7 located inside the grouting cavity 75. The end of the plug rod 72 is horizontally corresponding to the jack 721 formed on the surface of the second precast slab 3. The dimensions of the plug rod 72 are adapted to those of the jack 721, and the surface of the jack 721 is chamfered. When the connecting plate 71 moves, the connecting plate 71 can drive the plug board 7 to move. The plug rod 72 at the end of the plug board 7 can be inserted into the jack 721, preliminarily connecting the first precast slab 2 and the second precast slab 3 together.

[0054] As Figures 1 to 8As shown in the figure, in the specific implementation manner, a fixing block 731 is installed on the grouting cavity 75, a tension spring 732 is installed on the fixing block 731, and the other end of the tension spring 732 is installed on the side wall of the synchronous plate 73. The stretching direction of the tension spring 732 and the moving direction of the insertion plate 7 are on the same straight line. The rocker arm 742 is in an inclined state, the height of the end of the rocker arm 742 close to the second precast slab 3 is higher than the height of the other end. A limiting rod 741 is movably inserted through the sealing block 74. One end of the limiting rod 741 is fixedly installed on the side wall of the grouting cavity 75. A chute 746 is provided on the side wall of the second precast slab 3, and a clamping groove 745 is opened on the end face of the chute 746. A sliding plate 743 is slidably arranged on the chute 746. When the insertion plate 7 moves, the insertion plate 7 can drive the synchronous plate 73 to slide. The length of the synchronous plate 73 from the fixing block 731 becomes longer. At this time, the tension spring 732 is stretched, and the initial position of the synchronous plate 73 is limited by the tension spring 732. When the synchronous plate 73 slides, the rocker arm 742 on the synchronous plate 73 drives the sealing block 74 to move towards the center. At this time, the sealing block 74 can move downward along the limiting rod 741. Finally, the sliding plate 743 on the side wall of the sealing block 74 slides on the chute 746, and the clamping block 744 on the sliding plate 743 can be inserted into the clamping groove 745, and finally the fixing operation of the first precast slab 2 and the second precast slab 3 is completed.

[0055] The present invention also discloses a construction method for a precast stiffened beam structure, and the steps are as follows:

[0056] Step 1: Prepare the first precast slab 2 and the second precast slab 3, pour one end of the anchor bar 5 on the surfaces of the first precast slab 2 and the second precast slab 3, and the other end of the anchor bar 5 is exposed outside.

[0057] Step 2: Butt-join the first precast slab 2 and the second precast slab 3, place the I-beam 1 in the chamber formed by the first precast slab 2 and the second precast slab 3, and insert the anchor bolt 6 between the first precast slab 2 and the second precast slab 3, and perform a locking operation by rotating the anchor nut 61 on the anchor bolt 6.

[0058] Step 3: During the rotation of the anchor nut 61, the pressing connection plate 71 moves, the connection plate 71 drives the insertion plate 7 to move, the synchronous plate 73 on the insertion plate 7 drives the sealing block 74 to move towards the center through the rocker arm 742. Finally, the clamping block 744 on the sealing block 74 is inserted into the clamping groove 745 of the second precast slab 3, and finally the tight connection between the first precast slab 2 and the second precast slab 3 is completed. After the sealing block 74 moves, the sealing block 74 slides out from the inlet 751 of the grouting cavity 75, and the inlet 751 is opened.

[0059] Step 4: Partition plates are arranged at both ends of the space enclosed by the first precast slab 2 and the second precast slab 3, and then grouting operation is carried out into the internal chamber. Part of the grout will flow along the inlet 751 to the grouting chamber 75, so that the first precast slab 2 and the second precast slab 3 are connected together. Another part of the grout will fill the chamber enclosed by the first precast slab 2 and the second precast slab 3. After the grout cools and solidifies, the partition plates are disassembled. At this time, the first precast slab 2, the second precast slab 3 and the I-beam 1 are tightly connected together;

[0060] Step 5: A casting mold is installed on the structure cast in Step 4, and grouting is carried out into it. After the grouting is completed, a flat plate 4 is formed. At this time, the flat plate 4 will be connected as a whole with the I-beam 1, the first precast slab 2, the second precast slab 3 and the anchor bars 5.

[0061] The implementation principle of a precast stiffened beam structure and method of the present invention is as follows:

[0062] The operator first needs to prepare the first precast slab 2 and the second precast slab 3, pour one end of the anchor bar 5 on the surfaces of the first precast slab 2 and the second precast slab 3, and the other end of the anchor bar 5 is exposed outside. Then the operator makes a flat joint of the first precast slab 2 and the second precast slab 3, places the I-beam 1 in the chamber enclosed by the first precast slab 2 and the second precast slab 3, and inserts the anchor screw 6 between the first precast slab 2 and the second precast slab 3. By rotating the anchor nut 61 on the anchor screw 6 for locking operation, the first precast slab 2 and the second precast slab 3 can be closely attached together.

[0063] During the rotation of the anchor nut 61, the anchor nut 61 can squeeze the sliding sleeve 711. At this time, the sliding sleeve 711 moves along the anchor screw 6, and the sliding sleeve 711 drives the connecting plate 71 to move. Finally, the connecting plate 71 can be embedded into the inner groove 712, reducing the occupied space. When the connecting plate 71 moves, the connecting plate 71 can drive the inserting plate 7 to move, and the inserting rod 72 at the end of the inserting plate 7 can be inserted into the inserting hole 721, so that the first precast slab 2 and the second precast slab 3 are preliminarily connected together.

[0064] When the plug plate 7 moves, the plug plate 7 can drive the synchronous plate 73 to slide, and the length of the synchronous plate 73 from the fixed block 731 becomes longer. At this time, the tension spring 732 is stretched, and the initial position of the synchronous plate 73 is limited by the tension spring 732. When the synchronous plate 73 slides, the rocker arm 742 on the synchronous plate 73 drives the sealing block 74 to move toward the center. At this time, the sealing block 74 can move downward along the limiting rod 741, and finally the slide plate 743 of the side wall of the sealing block 74 slides on the slide groove 746, and the block 744 on the slide plate 743 can be inserted into the slot 745, finally completing the fixing operation of the first prefabricated plate 2 and the second prefabricated plate 3, and after the sealing block 74 moves, the sealing block 74 slides out from the inlet 751 of the grouting chamber 75, and at this time, the internal chamber of the grouting chamber 75 and the chamber formed by the first prefabricated plate 2 and the second prefabricated plate 3 are connected to each other.

[0065] Next, the operator needs to install baffles (not shown in the figure) at both ends of the space enclosed by the first precast panel 2 and the second precast panel 3, and then perform grouting operations into the internal chamber, wherein a portion of the slurry will flow along the inlet 751 to the grouting chamber 75, so that the structures such as the plug plate 7 and the block 744 connected inside the first precast panel 2 and the second precast panel 3 are cast together. At this time, the plug plate 7 is equivalent to a reinforcing rib, which ensures that the first precast panel 2 and the second precast panel 3 are stably connected together. Under the condition of later stress, the concrete wrapped around the I-beam 1 in the first precast panel 2 and the second precast panel 3 is not easy to crack, thereby improving the bearing capacity, and the other portion of the slurry will fill the chamber enclosed by the first precast panel 2 and the second precast panel 3, and finally the first precast panel 2, the second precast panel 3 and the I-beam 1 are tightly connected together to form a whole. When the slurry cools and solidifies, the baffle is removed.

[0066] Finally, the operator installs the casting mold on the cast structure and injects grout into the interior. After the injection, a flat plate 4 is formed. At this time, the flat plate 4 is connected to the I-beam 1, the first precast plate 2, the second precast plate 3 and the anchor bar 5 to form a whole. After the flat plate 4 is subjected to pressure, the flat plate 4 at this time not only transmits force through the anchor bar 5, but also transmits force because the I-beam 1 is also arranged inside the flat plate 4, thereby reducing the possibility of stress concentration. The force transmitted by the I-beam 1 will be transmitted to the concrete in the chamber surrounded by the first precast plate 2 and the second precast plate 3, wherein the first precast plate 2 and the second precast plate 3 can squeeze and fix the above concrete, thereby reducing the possibility of cracking and improving the overall bearing capacity of the beam.

Claims

1. A prefabricated stiff beam structure, characterized in that: include: I-beam (1); A first prefabricated plate (2), the first prefabricated plate (2) is L-shaped, and the bottom of the I-beam (1) is overlapped on the first prefabricated plate (2); The second prefabricated plate (3) is in the shape of a letter "I", the side wall of the first prefabricated plate (2) is tightly fitted with the side wall of the second prefabricated plate (3), the cavity enclosed by the first prefabricated plate (2) and the second prefabricated plate (3) is in the shape of a U, and grout is poured inside the cavity; An anchoring screw (6), the anchoring screw (6) horizontally passing through the first prefabricated plate (2) and the second prefabricated plate (3), and an anchoring nut (61) is installed at the end of the anchoring screw (6); A plug plate (7), a grouting cavity (75) is provided at the bottom of the first prefabricated plate (2), the plug plate (7) is movably plugged into the grouting cavity (75), a connecting plate (71) is installed at one end of the plug plate (7), and the connecting plate (71) is in contact with the surface of the anchor nut (61), a synchronous plate (73) is installed at the other end of the plug plate (7), a rocker arm (742) is rotatably installed on the synchronous plate (73), a sealing block (74) is installed at the end of the rocker arm (742), the sealing block (74) is slidably arranged on an inlet (751) provided on the surface of the first prefabricated plate (2), and the inlet (751) and the grouting cavity (75) are communicated with each other, a sliding plate (743) is installed on the side wall of the sealing block (74), a clamping block (744) is installed on the sliding plate (743), and the clamping block (744) corresponds to a clamping groove (745) provided on the side wall of the second prefabricated plate (3).

2. A prefabricated stiff beam structure according to claim 1, characterized in that: The height of the I-beam (1) is higher than the height of the first prefabricated plate (2); a through hole (11) is provided on the surface of the I-beam (1), the through hole (11) is used to connect the chambers located on both sides of the I-beam (1); a guide groove (21) is provided on the bottom of the first prefabricated plate (2); the size of the guide groove (21) is adapted to the size of the bottom of the I-beam (1), and the I-beam (1) is overlapped on the guide groove (21); the I-beam is made of Q355B steel.

3. The prefabricated stiff beam structure according to claim 1, characterized in that: The upper surfaces of the first precast plate (2) and the second precast plate (3) are flush with each other, a liquid injection port (211) is provided on the first precast plate (2), and the liquid injection port (211) is communicated with a cavity surrounded by the first precast plate (2) and the second precast plate (3), the first precast plate (2) and the second precast plate (3) are both precast from concrete, and the height of the second precast plate (3) is higher than that of the first precast plate (2).

4. The prefabricated stiff beam structure according to claim 1, characterized in that: The bottom of the second prefabricated plate (3) is lower than the bottom of the first prefabricated plate (2), a drip line (31) is provided at the bottom of the second prefabricated plate (3), and the opposing surfaces of the first prefabricated plate (2) and the second prefabricated plate (3) are bonded to each other.

5. The prefabricated stiff beam structure according to claim 1, characterized in that: It also includes a flat plate (4), which is placed above the first precast plate (2) and the second precast plate (3), and the first precast plate (2) and the second precast plate (3) are cast together with the flat plate (4), and the inner cavity of the flat plate (4) and the upper surface of the I-beam (1) are cast together; and anchor bars (5), the first precast plate (2) and the second precast plate (3) are integrally cast with anchor bars (5), and the other end of the anchor bars (5) is cast in the flat plate (4); a bending head (51) is provided at the top of the anchor bar (5), and the bending head (51) is cast in the flat plate (4), and a binding wire (52) is installed between adjacent anchor bars (5).

6. The prefabricated stiff beam structure according to claim 1, characterized in that: A sliding sleeve (711) is slidably sleeved on the anchor screw (6); the sliding sleeve (711) is disposed between the anchor nut (61) and the first prefabricated plate (2); the sliding sleeve (711) and the connecting plate (71) are connected to each other; an inner groove (712) is provided on the back of the first prefabricated plate (2); the inner groove (712) and the sliding sleeve (711) and the connecting plate (71) are mutually adapted in size.

7. The prefabricated stiff beam structure according to claim 1, characterized in that: An insertion rod (72) is installed at the end of the insertion plate (7) located inside the grouting cavity (75), the end of the insertion rod (72) corresponds horizontally to the insertion hole (721) opened on the surface of the second prefabricated plate (3), the size of the insertion rod (72) matches the size of the insertion hole (721), and the surface of the insertion hole (721) is chamfered.

8. The prefabricated stiff beam structure according to claim 1, characterized in that: A fixing block (731) is mounted on the grouting cavity (75), a tension spring (732) is mounted on the fixing block (731), the other end of the tension spring (732) is mounted on the side wall of the synchronization plate (73), and the tension direction of the tension spring (732) and the moving direction of the plug plate (7) are both on the same straight line.

9. The prefabricated stiff beam structure according to claim 1, characterized in that: The rocker arm (742) is in an inclined state, the height of the connection between the rocker arm (742) and the synchronous plate (73) is higher than the height of the connection between the rocker arm (742) and the sealing block (74), a limit rod (741) is movably inserted and arranged inside the sealing block (74), one end of the limit rod (741) is fixedly mounted on the side wall of the grouting cavity (75), a slide groove (746) is provided on the side wall of the second prefabricated plate (3), the clamping groove (745) is provided on the end surface of the slide groove (746), and the slide plate (743) is slidably arranged on the slide groove (746).

10. A construction method for a prefabricated rigid beam structure, characterized in that: Applied to a prefabricated rigid beam structure as claimed in any one of claims 1 to 9, the construction method of the prefabricated rigid beam structure comprises the following steps: Step 1: preparing a first prefabricated plate (2) and a second prefabricated plate (3), casting one end of an anchor bar (5) inside the first prefabricated plate (2) and the second prefabricated plate (3), and exposing the other end of the anchor bar (5) to the outside; Step 2: The first prefabricated plate (2) and the second prefabricated plate (3) are flatly connected, and an I-beam (1) is placed in the cavity surrounded by the first prefabricated plate (2) and the second prefabricated plate (3), and an anchoring screw (6) is inserted between the first prefabricated plate (2) and the second prefabricated plate (3), and a locking operation is performed by rotating an anchoring nut (61) on the anchoring screw (6); Step 3: During the rotation of the anchor nut (61), the connecting plate (71) is squeezed to move, the connecting plate (71) drives the plug plate (7) to move, and the synchronous plate (73) on the plug plate (7) drives the sealing block (74) to move toward the center through the rocker arm (742), so that the clamping block (744) on the sealing block (74) is finally inserted into the clamping groove (745) of the second prefabricated plate (3), and finally the first prefabricated plate (2) and the second prefabricated plate (3) are tightly connected, and after the sealing block (74) moves, the sealing block (74) slides out from the inlet (751) of the grouting cavity (75), and the inlet (751) is opened; Step 4: barrier plates are arranged at both ends of the cavity surrounded by the first prefabricated plate (2) and the second prefabricated plate (3), and then grouting is performed into the surrounded cavity, wherein a portion of the slurry flows along the inlet (751) to the grouting cavity (75), so that the first prefabricated plate (2) and the second prefabricated plate (3) are connected together, and another portion of the slurry fills the cavity surrounded by the first prefabricated plate (2) and the second prefabricated plate (3). After the slurry cools and solidifies, the barrier plates are removed, and at this time, the first prefabricated plate (2), the second prefabricated plate (3) and the I-beam (1) are tightly connected together; Step 5: Install a casting mold on the structure cast in step 4, and inject grout into the interior. After the injection, a flat plate (4) is formed. At this time, the flat plate (4) is connected to the I-beam (1), the first precast plate (2), the second precast plate (3) and the anchor bar (5) to form a whole.

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