Multifunctional platform for pile foundation construction

Abstract

The pile foundation construction multifunctional platform comprises a support frame, reinforcing plates are fixed to the inner wall of the support frame in the circumferential direction at intervals, lifting seats used for being connected with a crane are arranged at the top ends of the reinforcing plates, and positioning units used for centering and positioning a reinforcement cage are arranged on the lifting seats; the stabilizing seats are circumferentially arranged on the outer wall of the support frame, and stabilizing cylinders are fixedly connected to the top ends of the stabilizing seats; the lifting plate is arranged at the top end of the support frame and can slide on the stabilizing cylinder when the support frame is hoisted to move downwards after the support frame coincides with the center of a pile hole. By arranging the support frame and the centering adjusting mechanism, the centering adjusting mechanism can clamp the inner wall of a pile hole, the center of the support frame can coincide with the center of the pile hole before a reinforcement cage is placed, and then the possibility is provided for accurate positioning of the reinforcement cage.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building technology, in particular to a pile foundation construction multifunctional platform. BACKGROUND

[0002] In the process of building construction, pile foundation needs to be used, in the pile foundation construction, the reinforcement cage needs to be put into the pile hole, and then the concrete is poured into the pile hole, so as to fix the pile foundation. First, the pile foundation construction platform is placed above the pile hole by the crane and surrounds the pile hole, and then the reinforcement cage is put into the pile hole through the pile foundation construction platform, but the central axis of the hoisted pile foundation construction platform is easy to be eccentric with the central axis of the pile hole, and then the centering positioning of the reinforcement cage through the pile foundation construction platform will cause the deviation of the center of the reinforcement cage and the center of the pile hole, which will cause the inaccurate positioning of the reinforcement cage, and then will affect the construction quality. SUMMARY

[0003] The purpose of the present application is to solve the above problems, and to provide a pile foundation construction multifunctional platform which realizes the concentricity of the construction platform and the pile hole.

[0004] In order to solve the above technical problems, the present application adopts the following technical scheme: a pile foundation construction multifunctional platform, comprising: A support frame, the inner wall of the support frame is circumferentially spaced and fixed with a reinforcing plate, the top end of the reinforcing plate is provided with a lifting seat for connecting with a crane, and the lifting seat is provided with a positioning unit for centering positioning of the reinforcement cage; One or more than one stabilizing seat is circumferentially arranged on the outer wall of the support frame, and the top end of the stabilizing seat is fixed with a stabilizing cylinder; A lifting plate is arranged at the top end of the support frame and slides on the stabilizing cylinder when the support frame is lifted and moved downward after the support frame and the center of the pile hole coincide; A centering adjusting mechanism is arranged at the bottom end of the lifting plate and used for adjusting the coincidence of the center of the support frame and the center of the pile hole after moving into the pile hole.

[0005] Further, the lifting plate comprises a support plate arranged at the center of the support frame for connecting the centering adjusting mechanism, and a sliding plate circumferentially and equally spaced detachably arranged on the support plate and slidingly sleeved on the outer wall of the stabilizing cylinder.

[0006] Further, the centering adjusting mechanism comprises a double-shaft motor arranged at the top end of the support plate, one of the output shafts of the double-shaft motor is connected with a lead screw below the support plate, a threaded block of rectangular structure is threadedly sleeved on the lead screw, and a rod connecting unit is circumferentially arranged on the outer wall of the threaded block and slidingly connected with the support plate.

[0007] Further, the rod connecting unit comprises a notch formed in the outer wall of the threaded block, a swing rod is connected in the notch, one end of the swing rod away from the screw rod is provided with a push rod for clamping the inner wall of the pile hole, the push rod is connected with one end of the swing rod through an axis, the top end of the push rod is fixedly connected with a T-shaped sliding rod, and the bottom end of the supporting plate is provided with a slide way which is in abutment with the T-shaped sliding rod and slides.

[0008] Further, the stabilizing cylinder is provided with a displacement prevention mechanism for fixing the support frame when the support frame is placed on the ground, the displacement prevention mechanism comprises a threaded rod which is rotatably installed at the top end of the stabilizing cylinder, the top end of the threaded rod is connected with a gear, a through hole is formed in the stabilizing seat, and a plug rod which is used for being inserted into the ground is threadedly sleeved on the threaded rod and slidably inserted into the stabilizing cylinder and penetrates through the through hole.

[0009] Further, the inner wall of the stabilizing cylinder is fixedly connected with symmetrically arranged limiting plates, the outer wall of the plug rod is provided with limiting grooves in abutment with the limiting plates and sliding, and the bottom end of the plug rod is in a conical structure.

[0010] Further, the stabilizing cylinder is provided with a displacement prevention mechanism for fixing the support frame when the support frame is placed on the ground, the displacement prevention mechanism comprises a threaded rod which is rotatably installed at the top end of the stabilizing cylinder, the top end of the threaded rod is connected with a gear, a through hole is formed in the stabilizing seat, and a plug rod which is used for being inserted into the ground is threadedly sleeved on the threaded rod and slidably inserted into the stabilizing cylinder and penetrates through the through hole.

[0011] Further, the locking unit comprises a fixing frame which is arranged at the top end of the sliding plate and is sleeved on the outer portion of the stabilizing cylinder, symmetrically formed accommodating grooves in the inner wall of the fixing frame, a locking block which is in abutment with the inner portion of the accommodating groove and extends into the lock hole, and a spring which is used for connecting the locking block with the inner wall of the accommodating groove.

[0012] Further, the other output shaft of the double-shaft motor is provided with an adjusting piece which is used for adjusting the rotation of the gear after the lock hole is connected with the locking block, the adjusting piece comprises a fixing ring which is installed on the other output shaft of the double-shaft motor, a gear ring which is concentrically sleeved on the outer portion of the fixing ring and is meshingly connected with the gears, and a fixing rod which is circumferentially arranged between the outer wall of the fixing ring and the inner wall of the gear ring.

[0013] Further, the positioning unit comprises an electric push rod which is installed on the hanging seat, and the output shaft of the electric push rod is connected with a positioning plate which is used for clamping and positioning the reinforcement cage.

[0014] Compared with the prior art, the present application has the beneficial effects as follows: the present application, by being provided with the support frame, the lifting plate, the stabilizing seat, the stabilizing cylinder and the centering adjusting mechanism, facilitates the centering adjusting mechanism to hold and center the inner wall of the pile hole, so that the center of the support frame is coincided with the center of the pile hole before the placement of the reinforcement cage, which provides the possibility for the accurate positioning of the reinforcement cage; the design of the anti-displacement mechanism facilitates the insertion and fixing of the insertion rods with the ground, improves the connection stability of the support frame with the ground, avoids the displacement of the support frame when the reinforcement cage is placed, and further provides convenience for the later construction of the reinforcement cage; the design of the locking unit fixes the height of the supporting plate, provides stability for the connection of the adjusting member with the plurality of gears, and facilitates the simultaneous insertion of the plurality of insertion rods into the ground and the disconnection of the push rod from the clamping of the inner wall of the pile hole when the double-shaft motor controls the adjusting member to work, and the disconnection of the connection between the supporting plate and the sliding plate facilitates the taking out of the centering adjusting mechanism inside the pile hole, and provides convenience for the placement of the reinforcement cage in the pile hole. BRIEF DESCRIPTION OF DRAWINGS

[0015] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the application, and together with the description of the exemplary embodiments of the application given below, make an explanation of the application complete, and are not intended to limit the application unduly. In the drawings: Figure 1 It is a perspective view of an embodiment of the present application from one angle.

[0016] Figure 2 It is another perspective view of an embodiment of the present application from another angle.

[0017] Figure 3 It is a sectional view of Figure 1 .

[0018] Figure 4 It is a connection diagram of the lifting plate, the centering adjusting mechanism and the adjusting member.

[0019] Figure 5 It is a sectional view of Figure 4 .

[0020] Figure 6 It is a structural schematic diagram of the support frame.

[0021] Figure 7 It is an engagement connection diagram of the gear ring and the gear of the present application.

[0022] Figure 8 It is a sectional view of Figure 7 .

[0023] Figure 9 It is an enlarged structural schematic diagram of A in Figure 8 .

[0024] In the diagram: 1. Support frame; 2. Reinforcing plate; 3. Hanger; 4. Through hole; 5. Stabilizer; 6. Stabilizer cylinder; 7. Support plate; 8. Slide plate; 9. Dual-axis motor; 10. Lead screw; 11. Threaded block; 12. Swing rod; 13. Push rod; 14. Notch; 15. T-shaped slide rod; 16. Slide track; 17. Fixing frame; 18. Locking hole; 19. Threaded rod; 20. Limiting plate; 21. Insert rod; 22. Limiting groove; 23. Receiving groove; 24. Locking block; 25. Spring; 26. Gear; 27. Fixing ring; 28. Fixing rod; 29. ​​Gear ring; 30. Electric push rod; 31. Positioning plate; 32. Rotating shaft. Detailed Implementation

[0025] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0028] like Figures 1-9 As shown, the present invention provides a multi-functional platform for pile foundation construction, comprising: The inner wall of the support frame 1 is fixed with reinforcing plates 2 which are circumferentially spaced, and the top end of each reinforcing plate 2 is provided with a lifting seat 3 for connecting with a crane, and the lifting seat 3 is provided with a positioning unit for centrally positioning the reinforcement cage; One or more than one stabilizing seat 5 is circumferentially arranged on the outer wall of the support frame 1, and the top end of the stabilizing seat 5 is fixed with a stabilizing cylinder 6; A lifting plate is arranged at the top end of the support frame 1 and will slide on the stabilizing cylinder 6 when the support frame 1 is lifted and moved downward after the support frame 1 and the center of the pile hole coincide; A central adjustment mechanism is arranged at the bottom end of the lifting plate and is used to adjust the coincidence of the center of the support frame 1 and the center of the pile hole after moving into the pile hole.

[0029] In use, the lifting rope of the crane is connected with the lifting seat 3 to achieve the suspension of the support frame 1 and make it hang above the pile hole where the reinforcement cage is to be placed, but when the support frame 1 is placed on the ground, the central axis of the support frame 1 and the central axis of the pile hole are not in a straight line, so the central adjustment mechanism is arranged to suspend the central adjustment mechanism when the crane suspends the support frame 1, and the crane stops working when the central adjustment mechanism moves into the pile hole and the support frame 1 has not yet contacted the ground, and then the central adjustment mechanism acts to clamp the inner wall of the pile hole to achieve the coincidence of the center of the pile hole, and then the central axis of the support frame 1 and the central axis of the pile hole coincide, and then the crane is started, and the clamping of the central adjustment mechanism on the inner wall of the pile hole will make the support frame 1 stably move downward and be placed on the ground, and the stabilizing cylinder 6 will slide on the lifting plate during the downward movement of the support frame 1, which facilitates the support frame 1 to be concentric with the pile hole when it falls on the ground, so that the design effectively realizes the operation of the coincidence of the center of the support frame 1 and the center of the pile hole before the reinforcement cage is placed, thereby providing convenience and improving the quality of the later construction of the reinforcement cage.

[0030] It should be noted that the lifting plate includes a support plate 7 arranged at the center of the support frame 1 for connecting the central adjustment mechanism, and a slide plate 8 which is circumferentially and equally spaced detachably arranged on the support plate 7 and slidably sleeved on the outer wall of the stabilizing cylinder 6. Through the detachable design of the slide plate 8 and the support plate 7, the connection between the slide plate 8 and the support plate 7 can be disconnected after the support frame 1 and the center of the pile hole are aligned and before the reinforcement cage is placed, the slide plate 8 is taken out, and the slide plate 8 drives the central adjustment mechanism to move out of the pile hole, which provides the possibility for placing the reinforcement cage into the pile hole, and it should be noted that the support plate 7 and the slide plate 8 are connected by bolts.

[0031] It should be noted that the centering adjusting mechanism comprises a double-shaft motor 9 arranged at the top end of the support plate 7, one output shaft of the double-shaft motor 9 is connected with a lead screw 10 located below the support plate 7, the lead screw 10 is threadedly sleeved with a threaded block 11 of a rectangular structure, and the outer wall of the threaded block 11 is circumferentially provided with a rod connecting unit in sliding connection with the support plate 7. In this way, by starting the forward rotation of the double-shaft motor 9, the double-shaft motor 9 drives the rotation of the lead screw 10, and the threaded connection between the lead screw 10 and the threaded block 11 enables the rod connecting unit to act, so that the rod connecting unit clamps the inner wall of the pile hole, realizes the centering adjustment of the centering adjusting mechanism, and further provides the possibility for the centering of the support frame 1 and the pile hole.

[0032] It should be noted that the rod connecting unit comprises a notch 14 formed in the outer wall of the threaded block 11, the notch 14 is axially connected with an oscillating rod 12, the end of the oscillating rod 12 away from the lead screw 10 is provided with a push rod 13 for clamping the inner wall of the pile hole, the end of the push rod 13 is connected with the end of the oscillating rod 12 through a rotating shaft 32, the top end of the push rod 13 is fixedly connected with a T-shaped sliding rod 15, and the bottom end of the support plate 7 is formed with a slide 16 in abutting sliding connection with the T-shaped sliding rod 15. In this way, when the double-shaft motor 9 rotates forward, the lead screw 10 rotates to realize the downward movement of the threaded block 11 and drives the oscillating rod 12 to oscillate, the oscillating rod 12 pushes the push rod 13 to move laterally, the push rod 13 drives the T-shaped sliding rod 15 to slide in the slide 16, the four push rods 13 are expanded outward, the four push rods 13 clamp the inner wall of the pile hole, the centering adjustment is realized, the center of the support frame 1 is adjusted, the central axis of the support frame 1 is coaxial with the central axis of the pile hole, and the possibility of accurate positioning of the later-placed reinforcement cage in the pile hole is provided.

[0033] It should be noted that the stabilizing cylinder 6 is provided with a displacement prevention mechanism for fixing the support frame 1 when the support frame 1 is placed on the ground, the displacement prevention mechanism comprises a threaded rod 19 rotatably installed at the top end of the stabilizing cylinder 6, the top end of the threaded rod 19 is connected with a gear 26, a through hole 4 is formed in the stabilizing seat 5, and a plug rod 21 is threadedly sleeved on the threaded rod 19, slidably inserted into the stabilizing cylinder 6 and penetrates through the through hole 4 for insertion into the ground. In this way, when the gear 26 rotates, it drives the threaded rod 19 to rotate, and through the threaded connection between the slide 16 and the plug rod 21, the plug rod 21 slides downward on the inner wall of the stabilizing cylinder 6, so that the plug rod 21 is inserted into the ground, the positioning of the support frame 1 is realized, the displacement of the support frame 1 during the placement of the reinforcement cage is effectively avoided, and the stability of the later construction of the reinforcement cage is provided.

[0034] It should be noted that the inner wall of the stabilizing cylinder 6 is fixedly connected with the limiting plates 20 arranged symmetrically, the outer wall of the inserting rod 21 is provided with the limiting grooves 22 for the sliding of the limiting plates 20, and the bottom end of the inserting rod 21 is of a conical structure. In this way, the sliding operation of the limiting plates 20 and the limiting grooves 22 facilitates the stable lifting of the inserting rod 21, and facilitates the insertion of the inserting rod 21 into the ground to fix the support frame 1, thereby effectively avoiding the displacement of the support frame 1 on the ground.

[0035] It should be noted that the two sides of the stabilizing cylinder 6 are symmetrically provided with the lock holes 18, and the top end of the sliding plate 8 is provided with the locking unit for being connected with the lock holes 18 when the support frame 1 is placed on the ground. In this way, the connection of the locking unit and the lock holes 18 makes the gear 26 act and the inserting rod 21 inserted into the ground possible.

[0036] It should be noted that the locking unit comprises the fixed frame 17 arranged at the top end of the sliding plate 8 and sleeved on the outside of the stabilizing cylinder 6, the accommodating grooves 23 symmetrically provided in the inner wall of the fixed frame 17, the locking blocks 24 slidingly arranged in the accommodating grooves 23 and extending into the lock holes 18, and the springs 25 for connecting the locking blocks 24 with the inner wall of the accommodating grooves 23. In this way, since the end of the locking block 24 is in contact with the outer wall of the stabilizing cylinder 6, the spring 25 is in a compressed state. When the sliding plate 8 drives the fixed frame 17 to slide on the stabilizing cylinder 6, the locking block 24 is inserted into the lock hole 18 through the elastic force of the spring 25 after the locking block 24 is aligned with the lock hole 18, thereby realizing the connection of the sliding plate 8 and the stabilizing cylinder 6 and the fixation of the height of the supporting plate 7.

[0037] It should be noted that the other output shaft of the double-shaft motor 9 is provided with the adjusting member for adjusting the rotation of the gear 26 after the lock hole 18 is connected with the locking block 24. The adjusting member comprises the fixed ring 27 mounted on the other output shaft of the double-shaft motor 9, the gear ring 29 concentrically sleeved on the outside of the fixed ring 27 and engaged with the gears 26, and the fixed rods 28 circumferentially arranged between the outer wall of the fixed ring 27 and the inner wall of the gear ring 29. In this way, after the locking block 24 is fixed with the lock hole 18, the gear ring 29 is engaged with the gear 26, which improves the connection stability of the gear ring 29 and the gear 26. Then, the double-shaft motor 9 is started in reverse rotation, the fixed ring 27 is driven to rotate by the double-shaft motor 9, the gear ring 29 is driven to rotate by the fixed rods 28, which facilitates the rotation of the gears 26 and provides power for the inserting rod 21 to be inserted into the ground. At the same time, the reverse rotation of the double-shaft motor 9 causes the plurality of push rods 13 to move close to the lead screw 10 and disconnect the clamping of the inner wall of the pile foundation, thereby facilitating the pulling of the supporting plate 7 to drive the centering adjusting mechanism to move out of the pile hole.

[0038] It should be noted that the positioning unit comprises an electric push rod 30 mounted on the hanging seat 3, and the output shaft of the electric push rod 30 is connected with a positioning plate 31 for clamping and positioning the reinforcement cage. In this way, when the support plate 7 is disconnected from the sliding plate 8, the staff lifts the support plate 7, the support plate 7 drives the centering adjusting mechanism to move upward, and the gear ring 29 is disconnected from the gear 26, at the same time, the centering adjusting mechanism is separated from the pile hole, effectively providing the possibility of placing the reinforcement cage in the pile hole.

[0039] It is apparent to a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but rather that it can be implemented in other embodiments without deviating from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all respects as illustrative and not restrictive, the scope of the application being defined by the appended claims rather than by the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A multi-functional platform for pile foundation construction, comprising a support frame (1), wherein reinforcing plates (2) are fixedly fixed circumferentially on the inner wall of the support frame (1), and each reinforcing plate (2) is provided with a lifting seat (3) for connecting to a crane at its top end, and the lifting seat (3) is provided with a positioning unit for centering the reinforcing cage, characterized in that: include: One or more stabilizers (5) are circumferentially arranged on the outer wall of the support frame (1), and a stabilizer cylinder (6) is fixedly connected to the top of each stabilizer (5). The lifting plate is set at the top of the support frame (1) and will slide on the stabilizing cylinder (6) when the support frame (1) is hoisted down after the support frame (1) coincides with the center of the pile hole. The centering adjustment mechanism is located at the bottom of the lifting plate and is used to adjust the center of the support frame (1) to coincide with the center of the pile hole after the plate is moved into the pile hole.

2. The multi-functional platform for pile foundation construction as described in claim 1, characterized in that: The lifting plate includes a support plate (7) located at the center of the support frame (1) for connecting the centering adjustment mechanism and a sliding plate (8) detachably mounted on the support plate (7) and slidably sleeved on the outer wall of the stabilizing cylinder (6) at equal intervals around the periphery.

3. The multi-functional platform for pile foundation construction as described in claim 2, characterized in that: The centering adjustment mechanism includes a dual-axis motor (9) located at the top of the support plate (7). One of the output shafts of the dual-axis motor (9) is connected to a lead screw (10) located below the support plate (7). A rectangular threaded block (11) is threaded onto the lead screw (10). A rod connecting unit that is slidably connected to the support plate (7) is provided on the outer wall of the threaded block (11).

4. The multi-functional platform for pile foundation construction as described in claim 3, characterized in that: The rod connection unit includes a notch (14) on the outer wall of the threaded block (11), and a swing rod (12) is axially connected inside the notch (14). The end of the swing rod (12) away from the screw (10) is provided with a push rod (13) for clamping the inner wall of the pile hole. One end of the push rod (13) is connected to one end of the swing rod (12) through a rotating shaft (32). A T-shaped slide rod (15) is fixedly connected to the top of the push rod (13). A slide rail (16) is provided at the bottom of the support plate (7) to slide in contact with the T-shaped slide rod (15).

5. The multi-functional platform for pile foundation construction as described in claim 1, characterized in that: The stabilizing cylinder (6) is provided with an anti-displacement mechanism for fixing the support frame (1) when it is placed on the ground. The anti-displacement mechanism includes a threaded rod (19) rotatably installed on the top of the stabilizing cylinder (6). A gear (26) is connected to the top of the threaded rod (19). A through hole (4) is opened on the stabilizing seat (5). A plug rod (21) is threaded on the threaded rod (19) and slides through the inside of the stabilizing cylinder (6) and through the through hole (4) for insertion with the ground.

6. The multi-functional platform for pile foundation construction as described in claim 5, characterized in that: The inner wall of the stabilizing cylinder (6) is fixed with symmetrically arranged limiting plates (20), and the outer wall of the insert rod (21) is provided with a limiting groove (22) for the limiting plates (20) to slide against each other. The bottom end of the insert rod (21) is a conical structure.

7. The multi-functional platform for pile foundation construction as described in claim 3, characterized in that: The stabilizing cylinder (6) has symmetrically provided lock holes (18) on both sides, and the top of the sliding plate (8) is provided with a locking unit for connecting with the lock holes (18) when the support frame (1) is placed on the ground.

8. The multi-functional platform for pile foundation construction as described in claim 7, characterized in that: The locking unit includes a fixed frame (17) disposed on the top of the slide plate (8) and sleeved on the outside of the stabilizing cylinder (6), a receiving groove (23) symmetrically opened on the inner wall of the fixed frame (17), a locking block (24) that fits and slides inside the receiving groove (23) and extends into the lock hole (18), and a spring (25) for connecting the locking block (24) with the inner wall of the receiving groove (23).

9. The multi-functional platform for pile foundation construction as described in claim 8, characterized in that: The other output shaft of the dual-axis motor (9) is provided with an adjusting component for adjusting the rotation of the gear (26) after the lock hole (18) is connected to the locking block (24). The adjusting component includes a fixing ring (27) installed on the other output shaft of the dual-axis motor (9). A gear ring (29) that meshes with a plurality of gears (26) is concentrically sleeved on the outside of the fixing ring (27). A fixing rod (28) is circumferentially arranged between the outer wall of the fixing ring (27) and the inner wall of the gear ring (29).

10. The multi-functional platform for pile foundation construction as described in claim 1, characterized in that: The positioning unit includes an electric push rod (30) mounted on the hanger (3), and the output shaft of the electric push rod (30) is connected to a positioning plate (31) for clamping and positioning the steel cage.

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