Anchoring structure and construction method of fabricated laminated slab cantilever frame

Abstract

The application relates to the field of cantilevered scaffoldings, and particularly discloses an anchoring structure of an assembled laminated slab cantilevered scaffold and a construction method, wherein the anchoring structure comprises a profile steel fixedly arranged on a laminated slab and a pre-buried box pre-buried in the laminated slab, a U-shaped bolt is rotationally arranged in the pre-buried box, the profile steel is located between two screw rods of the U-shaped bolt, a lengthened bolt is detachably connected to the U-shaped bolt, one end of the lengthened bolt away from the screw rod is detachably connected to an upper pressing plate, a lower end surface of the upper pressing plate is abutted against an upper flange plate of the profile steel, and a lateral pressing mechanism is symmetrically arranged on both sides of a web plate of the profile steel and used for providing supporting force between the web plate of the profile steel and the screw rod on the same side. The U-shaped bolt is pre-buried in the laminated slab, the stability of the U-shaped bolt is improved, and the profile steel is laterally pressed by a jack, which is helpful to improve the stability of the profile steel anchoring.

Description

Technical Field

[0001] This application relates to the field of cantilever scaffolding construction, and in particular to an anchoring structure and construction method for a prefabricated composite slab cantilever scaffold. Background Technology

[0002] Construction scaffolding typically uses cantilevered steel frames, and U-bolts are a common method for anchoring the cantilevered steel. During construction, U-bolts are usually pre-embedded before pouring the cast-in-place layer on the composite slab, or holes are drilled in the composite slab to insert U-bolts.

[0003] Because the cast-in-place layer of the composite slab is relatively thin, if the U-bolts are pre-embedded in the cast-in-place layer, the stability of the U-bolts will be insufficient; while drilling will easily damage the composite slab and also affect the stability of the U-bolts, thus affecting the stability of the cantilever frame anchorage. Summary of the Invention

[0004] To address the issue of insufficient anchoring stability of cantilever scaffolds, this application provides an anchoring structure and construction method for prefabricated composite slab cantilever scaffolds.

[0005] The anchoring structure of the prefabricated composite slab cantilever frame provided in this application adopts the following technical solution:

[0006] An anchoring structure for a prefabricated composite slab cantilever frame includes:

[0007] The structural steel is fixedly installed on the composite slab;

[0008] An embedded box is embedded in the composite slab. Multiple embedded boxes are provided and are arranged at intervals along the extension direction of the steel section.

[0009] The U-bolt includes two screws and a connecting rod fixed between the two screws. The connecting rod passes through the opposite side walls of the embedded box and is rotatably disposed in the embedded box. The embedded box is provided with a locking component for locking the rotation angle of the connecting rod. The steel profile is located between the two screws.

[0010] An extended bolt is detachably connected to the end of the screw and is coaxial with the screw. An upper pressure plate is detachably connected to the end of the extended bolt away from the screw. The lower end face of the upper pressure plate abuts against the upper flange of the steel profile.

[0011] A lateral clamping mechanism is symmetrically arranged on both sides of the web of the steel profile to provide support force between the web of the steel profile and the screw on the same side.

[0012] Compared to the common method of pre-embedding U-bolts in the cast-in-place layer, this application uses a pre-embedded box in conjunction with U-bolts to pre-embed U-bolts before casting the composite slab. This improves the problem of poor stability of U-bolts caused by insufficient thickness of the cast-in-place layer, while avoiding damage to the composite slab caused by drilling. Compared to the common method of filling wooden wedges on both sides of the steel profile, this application uses a lateral clamping mechanism to apply supporting force between the web of the steel profile and the threaded rod on the same side. This helps to avoid problems such as incomplete filling of wooden wedges and lateral movement, thereby further improving the stability of the cantilever frame anchorage.

[0013] Furthermore, the composite slab is pre-embedded with a plurality of parallel transverse reinforcing bars and a plurality of parallel longitudinal reinforcing bars, the transverse reinforcing bars being orthogonal to the longitudinal reinforcing bars. The composite slab is also pre-embedded with a plurality of truss bars, the extension directions of the longitudinal reinforcing bars and the truss bars being parallel to the extension direction of the steel section.

[0014] The transverse reinforcement, longitudinal reinforcement, and truss reinforcement together form the skeleton of the composite slab.

[0015] Furthermore, the bottom of the embedded box is fixedly provided with multiple vertical support bars, and a transverse support bar is fixedly connected between two adjacent vertical support bars. Both the vertical support bars and the transverse support bars are tied to the truss bars with tie wire.

[0016] This allows for a fixed connection between the embedded box and the truss reinforcement, which helps prevent the embedded box from shifting during the pouring of the composite slab and also helps improve the stability of the embedded box in the composite slab.

[0017] Furthermore, both the transverse and longitudinal reinforcing bars pass through the gap between the embedded box and the transverse support bar, and both the transverse and longitudinal reinforcing bars are tied to the vertical support bar with tie wire.

[0018] This further improves the stability of the embedded box fixed in the composite plate.

[0019] Furthermore, the locking assembly includes at least two sets of clamping members fixedly disposed on the inner side wall of the pre-embedded box for clamping the connecting rod, and multiple sets of the clamping members are distributed on both sides of the connecting rod.

[0020] Multiple clamping components clamp the connecting rod on both sides to lock the rotation angle of the connecting rod.

[0021] Furthermore, the clamping member includes an upper clamping plate and a lower clamping plate fixed to the inner side wall of the pre-embedded box. Both the upper clamping plate and the lower clamping plate are elastic and a gap is provided between them to accommodate the connecting rod.

[0022] The flexible upper and lower clamps clamp the connecting rod, thereby locking the rotation angle of the connecting rod; when it is necessary to rotate the connecting rod, simply move the upper clamp away from the connecting rod to release the lock.

[0023] Furthermore, the laminated plate is provided with a receiving groove for accommodating the screw.

[0024] Rotating the screw allows it to be housed in the receiving slot, reducing the space occupied by the screw and thus facilitating the transportation and storage of the laminated plate.

[0025] Furthermore, the screw is threadedly connected to a threaded sleeve, which is threadedly connected to the extended bolt; the lateral clamping mechanism includes a jack, one end of which is rotatably connected to the threaded sleeve and the other end abuts against the web of the steel section.

[0026] The U-bolt is made of a split bolt, which extends the thread of the U-bolt by using an extension bolt and a threaded sleeve. Both the extension bolt and the threaded sleeve can be disassembled, recycled and reused, which helps to reduce the waste caused by the later cutting of the pre-embedded U-bolt.

[0027] Furthermore, one end of the jack is fixedly connected to a bearing sleeved on the threaded sleeve, and the other end is fixedly connected to an abutment block abutting against the web of the steel profile.

[0028] One end of the jack is rotatably connected to the threaded sleeve via a bearing, and the other end is stably pressed against the web of the steel section via an abutment block, which helps to improve the stability of the jack's pressing against the steel section.

[0029] This application provides a construction method for the anchoring structure of a prefabricated composite slab cantilever frame, including the following steps:

[0030] Step 1: Fix the embedded box: First, position and place the truss reinforcement, then place the embedded box with U-bolts. Tie the vertical and horizontal support bars at the bottom of the embedded box to the truss reinforcement with tie wire. Pass the horizontal and vertical reinforcement bars through the gap between the embedded box and the horizontal support bars and tie them firmly. Then, put the plastic sleeve on the screw rod and rotate the U-bolt to make the screw rod parallel to the composite plate.

[0031] Step 2: Pour concrete to construct the composite slab;

[0032] Step 3: Install the composite plate: hoist the composite plate to the predetermined position, rotate the U-bolt to make the screw orthogonal to the composite plate, and lock the angle of the U-bolt by locking the locking assembly, and then remove the plastic sleeve on the screw;

[0033] Step 4: Casting the cast-in-place layer: Cast the cast-in-place layer on the surface of the composite slab, then install the pads on the surface of the cast-in-place layer, and then hoist the steel sections to the predetermined position;

[0034] Step 5: Vertically fix the steel section: Connect the threaded sleeve and the extension bolt to the screw in sequence, and then fix the upper pressure plate to the extension bolt so that the upper pressure plate presses against the upper flange of the steel section;

[0035] Step 6: Laterally fix the steel section: Install and adjust the jack so that its end is pressed against the web of the steel section;

[0036] Step 7: Install scaffolding;

[0037] Step 8: Dismantle the scaffolding: After the construction is completed, dismantle the scaffolding, and then remove the top pressure plate, extension bolts, jacks and threaded sleeves;

[0038] Step 9: If the end of the screw is higher than the leveling layer, the screw can be cut.

[0039] In summary, this application includes at least one of the following beneficial technical effects:

[0040] 1. Compared with the common method of pre-embedding U-bolts in the cast-in-place layer, this application uses a pre-embedded box in conjunction with U-bolts to pre-embed U-bolts before casting the composite slab, which improves the problem of poor stability of U-bolts caused by insufficient thickness of the cast-in-place layer, and avoids damage to the composite slab caused by drilling.

[0041] 2. Compared with the currently common method of filling wooden wedges on both sides of the steel profile, this application uses a lateral clamping mechanism to apply a supporting force between the web of the steel profile and the bolt on the same side, which helps to avoid problems such as incomplete filling of wooden wedges and lateral movement, thereby further improving the stability of the cantilever frame anchorage;

[0042] 3. This application adopts a split bolt, which extends the thread of the U-bolt by using an extended bolt and a threaded sleeve. Both the extended bolt and the threaded sleeve can be disassembled, recycled and reused, which helps to reduce the waste caused by the later cutting of the pre-embedded U-bolt. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application;

[0044] Figure 2 This is a schematic diagram of the composite plate and the embedded U-bolts in the embodiments of this application;

[0045] Figure 3 This is a schematic diagram of the embedded box and U-bolt in the embodiments of this application;

[0046] Figure 4 This is a cross-sectional schematic diagram of the composite plate in the embodiments of this application;

[0047] Figure 5 This is a cross-sectional view of the composite plate from another angle in an embodiment of this application.

[0048] Reference numerals: 1-Composite slab; 11-Transverse reinforcement; 12-Longitudinal reinforcement; 13-Truss reinforcement; 14-Receiving groove; 2-Steel section; 3-Embedded box; 31-Vertical support reinforcement; 32-Transverse support reinforcement; 33-Upper clamping plate; 34-Lower clamping plate; 4-U-bolt; 41-Threaded rod; 42-Connecting rod; 51-Threaded sleeve; 52-Extended bolt; 53-Nut; 54-Washer; 55-Plate; 56-Upper pressure plate; 6-Jack; 61-Scissor lift bracket; 62-Drive shaft; 63-Fixing rod; 64-Bearing; 65-Abutment block. Detailed Implementation

[0049] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0050] This application discloses an anchoring structure for a prefabricated composite slab cantilever frame. (Refer to...) Figure 1 and Figure 2 The anchoring structure of the prefabricated composite slab cantilever frame includes a steel section 2 fixedly installed on the composite slab 1; multiple embedded boxes 3 are pre-embedded in the composite slab 1, and the multiple embedded boxes 3 are arranged at equal intervals along the extension direction of the steel section 2.

[0051] Reference Figure 2 and Figure 3 A U-bolt 4 is installed in the embedded box 3. The U-bolt 4 includes two screws 41 and a connecting rod 42 fixed between the two screws 41. The connecting rod 42 passes through the opposite side walls of the embedded box 3 and is rotatably disposed in the embedded box 3. The embedded box 3 is provided with a locking assembly for locking the rotation angle of the connecting rod 42. (Refer to...) Figure 1 The steel section 2 is located between the two screws 41.

[0052] Reference Figure 1 An extension bolt 52 is detachably connected to the end of the screw 41. The extension bolt 52 is coaxial with the screw 41. An upper pressure plate 56 is detachably connected to the end of the extension bolt 52 away from the screw 41. The lower end face of the upper pressure plate 56 abuts against the upper flange of the steel section 2. Lateral clamping mechanisms are symmetrically arranged on both sides of the web of the steel section 2 to provide support force between the web of the steel section 2 and the screw 41 on the same side.

[0053] Compared to the currently common method of pre-embedding U-bolts 4 in the cast-in-place layer, this application uses a pre-embedded box 3 in conjunction with U-bolts 4 to pre-embedding U-bolts 4 before casting the composite slab 1, which improves the problem of poor stability of U-bolts 4 caused by insufficient thickness of the cast-in-place layer, and avoids damage to the composite slab 1 caused by drilling.

[0054] Compared to the common method of fixing steel section 2 by inserting wooden wedges on both sides, this application uses a lateral clamping mechanism to apply a supporting force between the web of steel section 2 and the screw 41 on the same side, which helps to avoid problems such as incomplete insertion of wooden wedges and lateral movement, thereby further improving the stability of the cantilever frame anchorage.

[0055] Reference Figure 2 The composite slab 1 contains multiple parallel transverse reinforcing bars 11 and multiple parallel longitudinal reinforcing bars 12, with the transverse reinforcing bars 11 orthogonal to the longitudinal reinforcing bars 12. The composite slab 1 also contains multiple truss reinforcing bars 13, with the longitudinal reinforcing bars 12 and the truss reinforcing bars 13 extending parallel to the extension direction of the steel section 2. The transverse reinforcing bars 11, longitudinal reinforcing bars 12, and truss reinforcing bars 13 together form the skeleton of the composite slab 1.

[0056] Reference Figure 3 , Figure 4 and Figure 5 Vertical support bars 31 are fixedly installed at the four corners of the bottom of the pre-embedded box 3. A horizontal support bar 32 is fixedly connected between two adjacent vertical support bars 31. Both the vertical support bars 31 and the horizontal support bars 32 are tied to the truss bars 13 with tie wire.

[0057] Furthermore, referring to Figure 4 and Figure 5 Both the transverse reinforcing bars 11 and the longitudinal reinforcing bars 12 pass through the gap between the embedded box 3 and the transverse support bar 32. Both the transverse reinforcing bars 11 and the longitudinal reinforcing bars 12 are tied to the vertical support bar 31 with tie wire.

[0058] In this way, the embedded box 3 can be fixedly connected to the frame of the composite slab 1, which helps to prevent the embedded box 3 from shifting during the pouring of the composite slab 1, and also helps to improve the stability of the embedded box 3 in the composite slab 1.

[0059] To facilitate the installation of U-bolts 4 into the embedded box 3, the embedded box 3 can adopt a modular structure.

[0060] To lock the rotation angle of the U-bolt 4 in the embedded box 3, refer to Figure 3 The locking assembly includes at least two sets of clamping members fixedly disposed on the inner side wall of the pre-embedded box 3 for clamping the connecting rod 42, with multiple sets of clamping members distributed on both sides of the connecting rod 42. In this embodiment, four sets of clamping members are provided, with two sets of clamping members respectively disposed on both sides of the connecting rod 42.

[0061] Specifically, refer to Figure 3 The clamping components include an upper clamping plate 33 and a lower clamping plate 34 fixed to the inner side wall of the pre-embedded box 3. Both the upper clamping plate 33 and the lower clamping plate 34 are elastic and a gap is provided between them to accommodate the connecting rod 42.

[0062] The upper clamping plate 33 and the lower clamping plate 34 can be made of elastic iron or plastic sheets. To improve the stability of clamping, anti-slip structures such as anti-slip textures can be provided on the surfaces of the upper clamping plate 33 and the lower clamping plate 34 that contact the connecting rod 42 to increase the friction between the upper clamping plate 33 and the lower clamping plate 34 and the connecting rod 42.

[0063] The elastic upper clamping plate 33 and lower clamping plate 34 clamp the connecting rod 42, thereby locking the rotation angle of the connecting rod 42; when it is necessary to rotate the connecting rod 42, the upper clamping plate 33 is moved away from the connecting rod 42, which can release the lock of the connecting rod 42.

[0064] Reference Figure 2 and Figure 5 The composite plate 1 has a receiving groove 14 for accommodating the screw 41.

[0065] Rotating the U-bolt 4 allows the screw 41 to be housed in the receiving groove 14, which reduces the space occupied by the screw 41, thus facilitating the transportation and storage of the composite plate 1.

[0066] Reference Figure 1 A pad 55 is laid on the composite plate 1, and the end of the screw 41 passes through the pad 55. A threaded sleeve 51 is threadedly connected to the end of the screw 41, and the threaded sleeve 51 is threadedly connected to the extension bolt 52. A nut 53 is threadedly connected to the end of the extension bolt 52, and a washer 54 is placed between the nut 53 and the upper pressure plate 56. By tightening the nut 53, the upper pressure plate 56 can be pressed against the upper flange of the steel section 2.

[0067] This application adopts a split bolt, which extends the thread 41 of the U-bolt 4 by using an extension bolt 52 and a threaded sleeve 51. Both the extension bolt 52 and the threaded sleeve 51 can be disassembled, recycled and reused, which helps to reduce the waste caused by the later cutting of the pre-embedded U-bolt 4.

[0068] Reference Figure 1 The lateral clamping mechanism includes jacks 6 disposed on both sides of the web of the steel section 2. Each jack 6 includes a scissor lift bracket 61 and a drive shaft 62 for driving the extension and retraction of the scissor lift bracket 61. One end of the jack 6 is fixedly connected to a bearing 64 sleeved on a threaded sleeve 51, and the other end is fixedly connected to an abutment block 65 abutting against the web of the steel section 2. At the end of the steel section 2, a fixing rod 63 is connected between the two drive shafts 62.

[0069] Rotating the drive shaft 62 causes the scissor lift bracket 61 to extend and retract, thereby providing support between the jack 6 and the web of the steel section 2 and the screw 41 on the same side. The abutment block 65 increases the contact area between the end of the jack 6 and the web of the steel section 2, which helps to improve the stability of the jack 6 abutting the steel section 2. After the jack 6 is adjusted, the two drive shafts 62 at the end of the steel section 2 are fixed by the fixing rod 63, which further improves the stability of the jack 6 abutting the steel section 2.

[0070] This application also discloses a construction method for the anchoring structure of a prefabricated composite slab cantilever frame, including the following steps:

[0071] Step 1: Fixing the embedded box 3: First, position and place the truss reinforcement 13, then place the embedded box 3 equipped with U-bolts 4. Tie the vertical support 31 and horizontal support 32 at the bottom of the embedded box 3 to the truss reinforcement 13 with tie wire. Pass the horizontal reinforcement 11 and the longitudinal reinforcement 12 through the gap between the embedded box 3 and the horizontal support 32, and tie them firmly to the vertical support 31 at the bottom of the embedded box 3. Then, put a plastic sleeve on the screw 41. The plastic sleeve can protect the screw 41 during the pouring process. Then rotate the U-bolt 4 to make the screw 41 parallel to the composite plate 1.

[0072] Step 2: Pour concrete to create composite slab 1, cure it, mark it and store it. The part of the screw 41 that contacts the concrete forms a receiving groove 14.

[0073] Step 3: Install composite plate 1: Hoist composite plate 1 to the predetermined position, rotate U-bolt 4 so that screw 41 is orthogonal to composite plate 1, and lock the angle of U-bolt 4 by locking assembly, and then remove the plastic sleeve on screw 41;

[0074] Step 4: Casting the cast-in-place layer: Cast the cast-in-place layer on the surface of the composite slab 1 and cure it. After the concrete strength reaches 10MPa, install the pad 55 on the surface of the cast-in-place layer, and then hoist the steel section 2 to the predetermined position.

[0075] Step 5: Vertically fix the steel section 2: Connect the threaded sleeve 51 and the extension bolt 52 to the screw 41 in sequence, and then fix the upper pressure plate 56 to the extension bolt 52 so that the upper pressure plate 56 presses against the upper flange of the steel section 2.

[0076] Step 6: Laterally fix the steel section 2: Install and adjust the jack 6 so that its end abuts against the abutment block 65 tightly against the web of the steel section 2;

[0077] Step 7: Install scaffolding: Install scaffolding after the floor slab structure reaches 20MPa;

[0078] Step 8: Dismantle the scaffolding: After the construction is completed, dismantle the scaffolding, and then remove the top pressure plate 56, extension bolt 52, jack 6 and threaded sleeve 51;

[0079] Step 9: If the end of the screw 41 is higher than the leveling layer, the screw 41 can be cut.

[0080] The implementation principle of the anchoring structure and construction method of the prefabricated composite slab cantilever frame in this application embodiment is as follows: First, the pre-embedded box 3 with U-bolts 4 is fixedly connected to the skeleton steel bars of the composite slab 1, and then the composite slab 1 is poured to realize the pre-embedding of U-bolts 4 in the composite slab 1; after the composite slab 1 is hoisted to the predetermined position, the cast-in-place layer is poured, and then the steel section 2 is hoisted to the predetermined position. Threaded sleeve 51, extension bolt 52 and upper pressure plate 56 are connected to the screw rod 41 in sequence so that the upper pressure plate 56 is pressed against the upper flange of the steel section 2 to vertically fix the steel section 2; finally, the jack 6 is installed and adjusted so that the jack 6 provides support force between the web of the steel section 2 and the screw rod 41 on the same side to laterally fix the steel section 2.

[0081] Compared to the currently common method of pre-embedding U-bolts 4 in the cast-in-place layer, this application uses a pre-embedded box 3 in conjunction with U-bolts 4 to pre-embedding U-bolts 4 before casting the composite slab 1, which improves the problem of poor stability of U-bolts 4 caused by insufficient thickness of the cast-in-place layer, and avoids damage to the composite slab 1 caused by drilling.

[0082] Compared to the common method of filling wooden wedges on both sides of the steel section 2, this application uses a lateral clamping mechanism to apply a supporting force between the web of the steel section 2 and the screw 41 on the same side, which improves the problems of incomplete filling of wooden wedges and lateral movement, thereby further improving the stability of the cantilever frame anchorage.

[0083] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An anchoring structure for a prefabricated composite slab cantilever frame, characterized in that: include: The structural steel is fixedly installed on the composite slab; An embedded box is embedded in the composite slab. Multiple embedded boxes are provided and are arranged at intervals along the extension direction of the steel section. The U-bolt includes two screws and a connecting rod fixed between the two screws. The connecting rod passes through the opposite side walls of the embedded box and is rotatably disposed in the embedded box. The embedded box is provided with a locking component for locking the rotation angle of the connecting rod. The profile is located between the two screws. The composite plate is provided with a receiving groove for accommodating the screws. An extended bolt is detachably connected to the end of the screw and is coaxially arranged with the screw. An upper pressure plate is detachably connected to the end of the extended bolt away from the screw. The lower end face of the upper pressure plate abuts against the upper flange of the profile. A threaded sleeve is threadedly connected to the screw, and the threaded sleeve is threadedly connected to the extended bolt. A lateral clamping mechanism is symmetrically arranged on both sides of the web of the steel profile to provide support force between the web of the steel profile and the screw on the same side. The lateral clamping mechanism includes a jack, one end of which is rotatably connected to the threaded sleeve and the other end abutting against the web of the steel profile. One end of the jack is fixedly connected to a bearing sleeved on the threaded sleeve and the other end is fixedly connected to an abutting block abutting against the web of the steel profile.

2. The anchoring structure of the prefabricated composite slab cantilever frame according to claim 1, characterized in that: The composite slab has multiple parallel transverse reinforcing bars and multiple parallel longitudinal reinforcing bars embedded in it. The transverse reinforcing bars are orthogonal to the longitudinal reinforcing bars. The composite slab also has multiple truss bars embedded in it. The extension directions of the longitudinal reinforcing bars and the truss bars are parallel to the extension direction of the steel section.

3. The anchoring structure of the prefabricated composite slab cantilever frame according to claim 2, characterized in that: The bottom of the pre-embedded box is fixedly provided with multiple vertical support bars, and a horizontal support bar is fixedly connected between two adjacent vertical support bars. Both the vertical support bars and the horizontal support bars are tied to the truss bars with tie wire.

4. The anchoring structure of the prefabricated composite slab cantilever frame according to claim 3, characterized in that: Both the transverse and longitudinal reinforcing bars pass through the gap between the embedded box and the transverse support bar, and both the transverse and longitudinal reinforcing bars are tied to the vertical support bar with tie wire.

5. The anchoring structure of the prefabricated composite slab cantilever frame according to claim 1, characterized in that: The locking assembly includes at least two sets of clamping members fixedly disposed on the inner side wall of the pre-embedded box for clamping the connecting rod, and multiple sets of the clamping members are distributed on both sides of the connecting rod.

6. The anchoring structure of the prefabricated composite slab cantilever frame according to claim 5, characterized in that: The clamping component includes an upper clamping plate and a lower clamping plate fixed to the inner side wall of the pre-embedded box. Both the upper clamping plate and the lower clamping plate are elastic and a gap is provided between them to accommodate the connecting rod.

7. A construction method for the anchoring structure of the prefabricated composite slab cantilever frame according to any one of claims 1-6, characterized in that: Includes the following steps: Step 1: Fix the embedded box: First, position and place the truss reinforcement, then place the embedded box with U-bolts, tie the vertical and horizontal support bars at the bottom of the embedded box to the truss reinforcement with tie wire, pass the horizontal and vertical reinforcement bars through the gap between the embedded box and the horizontal support bars respectively, and tie them firmly, finally put the plastic sleeve on the screw rod, rotate the U-bolt to make the screw rod parallel to the composite plate; Step 2: Cast the composite slab; Step 3: Install the composite plate: hoist the composite plate to the predetermined position, rotate the U-bolt to make the screw orthogonal to the composite plate, and lock the angle of the U-bolt by locking the locking assembly, and then remove the plastic sleeve on the screw; Step 4: Casting the cast-in-place layer: Cast the cast-in-place layer on the surface of the composite slab, then install the pads on the surface of the cast-in-place layer, and then hoist the steel sections to the predetermined position; Step 5: Vertically fix the steel section: Connect the threaded sleeve and the extension bolt to the screw in sequence, and then fix the upper pressure plate to the extension bolt so that the upper pressure plate presses against the upper flange of the steel section; Step 6: Laterally fix the steel section: Install and adjust the jack so that its end is pressed against the web of the steel section; Step 7: Install scaffolding; Step 8: Dismantle the scaffolding: After the construction is completed, dismantle the scaffolding, and then remove the top pressure plate, extension bolts, jacks and threaded sleeves; Step 9: If the end of the screw is higher than the leveling layer, the screw can be cut.

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