Hoop type steel support adjustable head fastening device and using method thereof

Abstract

The invention relates to the field of foundation pit engineering, in particular to a hoop type steel support adjustable head fastening device and a using method thereof. Comprising a steel frame; the distance between the two main jacks is adjustable, the telescopic ends of the main jacks abut against the inner side of the movable head, and a driving mechanism used for driving the main jacks to move is arranged on the steel frame; the vertical jack is installed on the steel frame, and the telescopic end of the vertical jack is vertically downward and used for pressing the steel wedge block into the gap between the steel support and the adjustable head; and the jack pump station is arranged on the steel frame and is connected with the main jack and the vertical jack. The device has the beneficial effects that by arranging the vertical jack, manual knocking on the steel wedge block is avoided, the wedging force of the steel wedge block can be guaranteed, then it is guaranteed that the gap formed by the movable head and the steel support after jacking and stretching is completely filled with the steel wedge block, and the axial force of the steel support meets the construction requirement.

Description

Technical Field

[0001] The present invention relates to the field of foundation pit engineering, and in particular to a clamp-type steel support movable head fastening device and a use method thereof. Background Art

[0002] Currently, the steel wedges in the steel support joints used in foundation pit projects need to be hammered in manually. Due to varying strengths among workers, it's difficult to ensure the steel wedges completely fill the gap between the extended joint and the steel support. This can cause eccentric compression of the steel support or retraction of the joint after the jacks for extending the joint are unloaded. This can lead to excessive deformation of the foundation pit retaining structure or instability of the steel support, compromising pit safety.

[0003] Therefore, the present invention provides a clamp-type steel support movable head fastening device and a method of using the same. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a clamp-type steel support active head fastening device and a method of use thereof, so as to solve the problem that the steel wedge blocks in the existing steel support active head need to be knocked in manually, making it difficult to ensure that the steel wedge blocks completely fill the gap formed between the active head and the steel support after the top extension.

[0005] The technical solution to achieve the above purpose is:

[0006] The present invention provides a clamp-type steel support active head fastening device, wherein the connecting shaft of the active head is inserted into the steel support and the insertion length is adjustable, and a steel wedge is inserted into the gap between the active head and the steel support. The fastening device comprises:

[0007] A steel frame, the bottom of which is provided with a plurality of spaced arc-shaped limit plates, the bottom of which is formed with an arc-shaped groove for fitting with the outer surface of the steel support;

[0008] Two main jacks are provided at the bottom of the steel frame. The two main jacks are located on both sides of the movable head and the distance between them is adjustable. The main jacks are used to push the inner side of the movable head so that the movable head extends from the steel support. The steel frame is provided with a driving mechanism for driving the main jacks to move;

[0009] A vertical jack mounted on the steel frame, the telescopic end of the vertical jack being directed vertically downward to press the steel wedge down into the gap between the steel support and the movable head;

[0010] A jack pump station is arranged on the steel frame, and the jack pump station is connected to the main jack and the vertical jack.

[0011] Furthermore, the driving mechanism includes two transverse jacks mounted on the bottom of the steel frame and a main jack mounting bracket mounted on the telescopic end of the transverse jacks, the main jacks being mounted on the main jack mounting bracket and perpendicular to the transverse jacks, and the transverse jacks being connected to the jack pump station;

[0012] The bases of the two transverse jacks are coaxially connected and the extension directions of the telescopic ends are opposite, so that the two main jacks on both sides of the movable head can approach each other or move away from each other.

[0013] Furthermore, it also includes two arc-shaped hoop plates, which are respectively hinged to the two ends of one of the arc-shaped limiting plates. The inner sides of the two arc-shaped hoop plates are arc-shaped and are used to fit the outer surface of the steel support. The two arc-shaped hoop plates are spliced ​​with the arc-shaped limiting plates to form a circular hole on the inner side that wraps around the outer surface of the steel support, thereby temporarily fixing the steel frame and the steel support.

[0014] The two arc-shaped hoop plates are drivingly connected to the driving mechanism.

[0015] Furthermore, it also includes:

[0016] Two sliders, with sliding grooves vertically opened on both sides of the arc-shaped limit plate hinged to the arc-shaped hoop plate, the two sliders are respectively located in the corresponding sliding grooves, and a steel strand is provided on the top of the slider, and the other end of the steel strand is connected to the telescopic end of the horizontal jack;

[0017] Two steel chains have slots on both sides of the corresponding arc-shaped limit plates to connect the slide groove with the outside world. One side of the slider is provided with an extension section extending to the outside world through the slot. One end of the two steel chains is connected to the corresponding extension section, and the other end is connected to the outside of the corresponding arc-shaped clamp plate.

[0018] Furthermore, a latch is provided at the bottom of the two sliders, and the latch is slidably disposed in the slide groove;

[0019] The tops of the two arc-shaped hoop plates are provided with sockets for the latch to be inserted.

[0020] Furthermore, two fixed pulleys and two universal pulleys are provided at the bottom of the steel frame. The two fixed pulleys are respectively located in the sliding grooves of the corresponding arc-shaped limit plates, and the two universal pulleys are respectively located on one side of the transverse jack. One end of the steel strand passes around the fixed pulley and the universal pulley and then is connected to the transverse jack.

[0021] Furthermore, it also includes a jack control system and an axial force monitoring system. The axial force monitoring system is used to monitor the axial force of the steel support in real time. The jack control system is used to control the vertical jack, drive mechanism and main jack, and receive axial force data from the axial force monitoring system to adjust the thrust of the main jack and vertical jack according to the axial force data so that the steel support reaches the set axial force.

[0022] The present invention also provides a method for using a clamp-type steel support active head fastening device, which specifically includes the following steps:

[0023] S1. After the steel support is installed at the construction location, provide hoisting equipment and use the hoisting equipment to hoist the fastening device to the top of the steel support, and make the arc-shaped groove of the arc-shaped limit plate fit the outer surface of the steel support;

[0024] S2. Determine the set axial force of the steel support based on the support force required by the foundation pit retaining structure;

[0025] S3. Adjust the distance between the two main jacks through the driving mechanism so that the two main jacks are moved between the steel support and the movable head;

[0026] S4. Start the two main jacks to push the movable head so that the movable head extends out from the steel support, then gradually increase the axial force of the main jacks. After the axial force of the steel support reaches the set axial force, lock the main jacks;

[0027] S5. After the last steel wedge is inserted into the gap between the joint and the steel support, the vertical jack is activated, and the telescopic end of the vertical jack is extended to press the steel wedge downward. After the steel wedge is pressed into place, the axial force of the vertical jack is maintained unchanged to continuously apply pressure to the steel wedge. After the pressure application time is reached, the telescopic end of the vertical jack is retracted.

[0028] S6. Contract the telescopic end of the main jack and monitor the axial force of the steel support in real time. If the axial force of the steel support remains unchanged, it is determined that the steel support and the movable head are tightened. Otherwise, repeat the above steps S4 and S5 until the telescopic end of the main jack is contracted again and the axial force of the steel support remains unchanged.

[0029] Furthermore, the fastening device further comprises two arc-shaped hoop plates hingedly connected to both ends of one of the arc-shaped limiting plates, and the inner sides of the arc-shaped hoop plates are arc-shaped;

[0030] After the fastening device is hoisted to the top of the steel support, the angles of the two arc-shaped clamping plates are adjusted through the driving mechanism so that the arc-shaped clamping plates and the arc-shaped limit plates are spliced ​​together to form a circular hole on the inner side that wraps around the outer surface of the steel support, thereby temporarily fixing the fastening device to the steel support.

[0031] Furthermore, the fastening device further includes a jack control system and an axial force monitoring system. In steps S4 to S6, the axial force monitoring system monitors the axial force of the steel support in real time to determine whether the axial force of the steel support reaches the set axial force, and the jack control system receives the axial force monitored by the axial force monitoring system.

[0032] In step S6, the jack control system contracts the telescopic end of the main jack. When the axial force of the steel support received by the jack control system becomes smaller, the telescopic end of the main jack is extended again to make the axial force of the steel support reach the set axial force again, and then the vertical jack is restarted, and the downward force and pressure time of the vertical jack are increased to make the steel wedge block more firm; if the axial force of the steel support received by the jack control system remains unchanged, the telescopic end of the main jack is contracted again.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] By setting up a vertical jack, manual hammering of the steel wedges can be avoided, so that the force of the steel wedges can be guaranteed, thereby ensuring that the steel wedges completely fill the gap formed by the extended active head and the steel support, and the axial force of the steel support meets the construction requirements.

[0035] By setting up a transverse jack, the main jack and the arc-shaped hoop plate can be moved outward from the steel support and rotated upward, which is convenient for installation and construction.

[0036] By setting up the arc-shaped hoop plate, it is possible to prevent the steel frame from moving upward when the vertical jack on the steel frame presses down the steel wedge block, causing the vertical jack to fail in pressing down the steel wedge block.

[0037] By setting up a jack control system and an axial force monitoring system, the axial forces of the main jack and the vertical jack can be automatically adjusted according to the steel support axial force collected by the axial force monitoring system to ensure that the steel support axial force meets the construction requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The present invention is a front cross-sectional view of a clamp-type steel support movable head fastening device in an installed state.

[0039] Figure 2 This is a front cross-sectional view of a clamp-type steel support active head fastening device of the present invention in a state where a steel wedge is pressed down.

[0040] Figure 3 The figure is a side sectional view of a clamp-type steel support movable head fastening device of the present invention in a state where a steel wedge block is pressed down.

[0041] Legend: 1. Flexible head; 2. Steel support; 3. Main jack; 4. Horizontal jack; 5. Vertical jack; 6. Main jack fixing frame; 7. Vertical jack fixing beam; 8. Steel frame; 9. Hook; 10. Balance weight; 11. Jack pump station; 12. Arc limit plate; 13. Steel wedge; 14. Slot; 15. Universal pulley; 16. Fixed pulley; 17. Steel strand; 18. Slide; 19. Slider; 20. Pin; 21. Steel chain; 22. Arc clamp plate; 23. Socket; 24. Jack control system; 25. Axial force monitoring system. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0043] See Figure 1 The present invention provides a clamp-type steel support active head fastening device and a method of using the same, which solves the problem that the steel wedges in the existing steel support active head need to be knocked in manually, making it difficult to ensure that the steel wedges completely fill the gap formed between the active head and the steel support after extension.

[0044] By setting up a vertical jack, manual hammering of the steel wedges can be avoided, so that the force of the steel wedges can be guaranteed, thereby ensuring that the steel wedges completely fill the gap formed by the extended active head and the steel support, and the axial force of the steel support meets the construction requirements.

[0045] By setting up a transverse jack, the main jack and the arc-shaped hoop plate can be moved outward from the steel support and rotated upward, which is convenient for installation and construction.

[0046] By setting up the arc-shaped hoop plate, it is possible to prevent the steel frame from moving upward when the vertical jack on the steel frame presses down the steel wedge block, causing the vertical jack to fail in pressing down the steel wedge block.

[0047] By setting up a jack control system and an axial force monitoring system, the axial forces of the main jack and the vertical jack can be automatically adjusted according to the steel support axial force collected by the axial force monitoring system to ensure that the steel support axial force meets the construction requirements.

[0048] The following describes a clamp-type steel support movable head fastening device and its use method in conjunction with the accompanying drawings.

[0049] See Figure 1 , showing a front cross-sectional view of the installation state of a clamp type steel support movable head fastening device of the present invention. Figure 2 , showing a front cross-sectional view of a clamp-type steel support active head fastening device of the present invention in a state where a steel wedge is pressed down. Figure 3 , showing a side sectional view of a clamp type steel support active head fastening device of the present invention pressing down the steel wedge block. Figures 1 to 3, a clamp-type steel support movable head fastening device and a method of using the same are described in the present invention.

[0050] like Figures 1 to 3 As shown, the present invention is a clamp-type steel support active head fastening device, the connecting shaft of the active head 1 is inserted into the steel support 2 and the insertion length is adjustable, and a steel wedge 13 is inserted into the gap between the active head 1 and the steel support 2. The fastening device includes:

[0051] A steel frame 8, the bottom of which is provided with a plurality of spaced arc-shaped limiting plates 12, the bottom of which is formed with an arc-shaped groove for fitting with the outer surface of the steel support 2;

[0052] Two main jacks 3 are provided at the bottom of the steel frame 8. The two main jacks 3 are located on both sides of the movable head 1 and the distance between them is adjustable. The main jacks 3 are used to push the inner side of the movable head 1 so that the movable head 1 extends from the steel support 2. The steel frame 8 is provided with a driving mechanism for driving the main jacks 3 to move;

[0053] A vertical jack 5 is mounted on the steel frame 8, and the telescopic end of the vertical jack 5 is vertically downwardly used to press the steel wedge 13 down into the gap between the steel support 2 and the movable head 1;

[0054] A jack pump station 11 is provided on the steel frame 8 , and the jack pump station 11 is connected to the main jack 3 and the vertical jack 5 .

[0055] Specifically, the steel frame 8 is assembled and welded from steel materials. A vertical jack fixing beam 7 is horizontally arranged on the steel frame 8, and the vertical jack 5 is fixed to the jack fixing beam 7. A push plate is provided at the end of the movable head 1, and a stiffening rib is provided between the push plate and the connecting shaft for reinforcement. By making the position of the main jack 3 adjustable, the distance between the main jack 3 and the steel support 2 is adjusted to the farthest before the fastening device is hoisted onto the steel support 2, thereby preventing the main jack 3 from colliding with the steel support 2 during hoisting.

[0056] In a specific embodiment, the driving mechanism includes two transverse jacks 4 mounted on the bottom of the steel frame 8 and a main jack mounting frame 6 mounted on the telescopic end of the transverse jacks 4. The main jack 3 is mounted on the main jack mounting frame 6 and is perpendicular to the transverse jacks 4. The transverse jacks 4 are connected to the jack pump station 11.

[0057] The bases of the two transverse jacks 4 are coaxially connected and the extension directions of the telescopic ends are opposite, so that the two main jacks 3 on both sides of the movable head 1 can move closer to or farther away from each other.

[0058] In one embodiment, the structure further includes two curved hoop plates 22, each hinged to the ends of one of the curved limiting plates 12. The inner sides of the two curved hoop plates 22 are curved to fit against the outer surface of the steel support 2. The two curved hoop plates 22 are joined with the curved limiting plate 12 to form a circular hole on the inner side that wraps around the outer surface of the steel support 2, thereby temporarily securing the steel frame 8 to the steel support 2. The two curved hoop plates 22 are drivably connected to the drive mechanism. The provision of the curved hoop plates 22 temporarily secures the steel frame 8 to the steel support 2, preventing the steel frame 8 from upward displacement when the vertical jack 5 presses down on the steel wedge 13, thereby preventing the steel wedge 13 from failing to press down properly.

[0059] Specifically, there are three arc-shaped limiting plates 12 , and two arc-shaped hoop plates 22 are hinged to the arc-shaped limiting plate 12 in the middle.

[0060] In a specific embodiment, it also includes:

[0061] Two sliders 19, a sliding groove 18 is vertically opened on both sides of the arc-shaped limit plate 12 hinged to the arc-shaped hoop plate 22, and the two sliders 19 are respectively located in the corresponding sliding grooves 18. The top of the slider 19 is provided with a steel strand 17, and the other end of the steel strand 17 is connected to the telescopic end of the transverse jack 4;

[0062] Two steel chains 21 and corresponding arc-shaped limit plates 12 are provided with slots on both sides to connect the slide 18 with the outside world. One side of the slider 19 is provided with an extension section extending to the outside world through the slot. One end of the two steel chains 21 is connected to the corresponding extension section, and the other end is connected to the outer side of the corresponding arc-shaped clamp plate 22.

[0063] In one embodiment, a latch 20 is provided at the bottom of the two sliders 19 , and the latch 20 is slidably disposed in the slide groove 18 ;

[0064] The tops of the two arc-shaped hoop plates 22 are provided with sockets 23 for the latch 20 to be inserted into.

[0065] In a specific embodiment, two fixed pulleys 16 and two universal pulleys 15 are provided at the bottom of the steel frame 8. The two fixed pulleys 16 are respectively located in the sliding grooves of the corresponding arc-shaped limit plates 12, and the two universal pulleys 15 are respectively located on one side of the transverse jack 4. One end of the steel strand 17 passes around the fixed pulley 16 and the universal pulley 15 and then is connected to the transverse jack 4.

[0066] Specifically, when the latch 20 is fully inserted into the socket 23, the steel chain 21 is in a relaxed state. As the latch 20 gradually moves upward, the upper end of the steel chain 21 is pulled upward by the slider 19. When the latch 20 is completely disengaged from the socket 23, the steel chain 21 is in a taut state, and as the latch 20 continues to move upward, the steel chain 21 can pull the curved hoop plate 22 to rotate. Accordingly, when the inner side of the curved hoop plate 22 is completely in contact with the outer surface of the steel support 2, the lower end of the latch 20 is flush with the top of the curved hoop plate 22, allowing the latch 20 to more easily insert into the socket 23 at the top of the curved hoop plate 22 as it continues to descend.

[0067] In a specific embodiment, it also includes a jack control system 24 and an axial force monitoring system 25. The axial force monitoring system is used to monitor the axial force of the steel support 2 in real time. The jack control system 24 is used to control the vertical jack, the drive mechanism and the main jack, and receive the axial force data from the axial force monitoring system 25 to adjust the thrust of the main jack 3 and the vertical jack 5 according to the axial force data so that the steel support 2 reaches the set axial force. The jack control system and the axial force monitoring system are installed on the steel frame 8, and the jack control system 24 is connected to the axial force monitoring system 25. The axial force monitoring system 25 includes a plurality of axial force strain gauges provided on the outer surface of the steel support 2, and a plurality of axial force strain gauges are distributed on both sides of the steel support, so that the measurement is more accurate.

[0068] Specifically, a plurality of hooks 9 are provided on the top of the steel frame 8 for the lifting equipment to lift the steel frame 8. A balancing weight 10 is provided on the steel frame 8 so that the lifting equipment can keep the steel frame 8 balanced when lifting the steel frame 8.

[0069] Specifically, a slot 14 is provided on the top of the connecting shaft of the movable head 1 , and the steel wedge 13 is inserted into the slot 14 .

[0070] The present invention also provides a method for using a clamp-type steel support active head fastening device, which specifically includes the following steps:

[0071] S1. After the steel support 2 is installed at the construction location, provide hoisting equipment and use the hoisting equipment to hoist the fastening device to the top of the steel support 2, and make the arc-shaped groove of the arc-shaped limit plate 12 fit the outer surface of the steel support 2;

[0072] S2. Determine the set axial force of steel support 2 according to the supporting force required by the foundation pit retaining structure;

[0073] S3, adjusting the distance between the two main jacks 3 through the driving mechanism, so that the two main jacks 3 are moved between the steel support 2 and the movable head 1;

[0074] S4, start the two main jacks 3 to push the movable head 1 so that the movable head 1 extends from the steel support 2, then gradually increase the axial force of the main jacks 3. After the axial force of the steel support 2 reaches the set axial force, lock the main jacks 3;

[0075] S5. After the last steel wedge 13 is inserted into the gap between the movable head 1 and the steel support 2, the vertical jack 5 is started, and the telescopic end of the vertical jack 5 is extended to press the steel wedge 13 downward. After the steel wedge 13 is pressed into place, the vertical jack 5 maintains the axial force unchanged to continuously apply pressure to the steel wedge 13, and after the pressure application time is reached, the telescopic end of the vertical jack 5 is retracted;

[0076] S6. Contract the telescopic end of the main jack 3 and monitor the axial force of the steel support 2 in real time. If the axial force of the steel support 2 remains unchanged, it is determined that the steel support 2 and the movable head 1 are fastened. Otherwise, repeat the above steps S4 and S5 until the axial force of the steel support 2 remains unchanged when the telescopic end of the main jack 3 is contracted.

[0077] In a specific embodiment, the fastening device further includes two arc-shaped hoop plates 22 hinged to both ends of one of the arc-shaped limiting plates 12, and the inner side of the arc-shaped hoop plates 22 is arc-shaped;

[0078] After the fastening device is hoisted to the top of the steel support 2, the angles of the two arc-shaped clamping plates 22 are adjusted by the driving mechanism so that the arc-shaped clamping plates 22 are spliced ​​with the arc-shaped limiting plates 12 to form a circular hole on the inner side that wraps around the outer surface of the steel support 2, thereby temporarily fixing the hoisting device to the steel support 2.

[0079] In a specific embodiment, the fastening device further includes a jack control system and an axial force monitoring system. In steps S4 to S6, the axial force of the steel support 2 is monitored in real time by the axial force monitoring system to determine whether the axial force of the steel support 2 reaches the set axial force, and the jack control system receives the axial force monitored by the axial force monitoring system.

[0080] In step S6, the jack control system contracts the telescopic end of the main jack 3. When the jack control system receives that the axial force of the steel support 2 becomes smaller, the telescopic end of the main jack 3 is extended again to make the axial force of the steel support 2 reach the set axial force again, and then the vertical jack 5 is restarted, and the downward force and pressure time of the vertical jack 5 are increased to make the steel wedge block 13 more firm; if the jack control system 24 receives that the axial force of the steel support 2 remains unchanged, the telescopic end of the main jack 3 is contracted again.

[0081] The following describes in detail the use process and working principle of the clamp-type steel support active head fastening device of the present invention.

[0082] After the steel support 2 and the joint 1 are installed at the construction location, the fastening device is hoisted using the lifting equipment via the hook 9. The initial fastening device is then adjusted. The jack control system extends the telescopic end of the transverse jack 4, increasing the distance between the two main jacks 3. The steel strands 17 and steel chains 21 increase the distance between the two curved clamping plates 22. The fastening device is then hoisted to the top of the steel support 2, ensuring that the curved grooves of the curved stop plates 12 at the bottom of the steel frame 8 align with the outer surface of the steel support 2.

[0083] Then the jack control system 24 starts the two transverse jacks 4 through the jack pump station 11, causing the telescopic ends of the two transverse jacks 4 to contract, thereby driving the two main jacks 3 to approach each other through the main jack fixing frame 6 until they reach the jacking position.

[0084] When the telescopic end of the transverse jack 4 contracts, it pulls the corresponding ends of the two steel strands 17 closer together, causing the other ends of the strands 17 to drop. The slider 19, along with the steel strands 17, descends, and, via the steel chain 21, pulls the two curved clamping plates 22 closer together, lowering the latch 20. When the inner sides of the two curved clamping plates 22 are fully aligned with the outer surface of the steel support 2, the latch 20 continues to descend and gradually inserts into the socket 23 at the top of the curved clamping plates 22, preventing them from rotating.

[0085] After the last steel wedge 13 is manually inserted into the gap between the movable head 1 and the steel support 2, the jack control system starts the vertical jack 5 through the jack pump station 11, so that the telescopic end of the vertical jack 5 extends to press down the steel wedge 13, and after the steel wedge 13 is pressed into place, the vertical jack 5 maintains the axial force unchanged to continuously apply pressure to the steel wedge 13, and after the pressure application time is reached, the telescopic end of the vertical jack 5 is retracted.

[0086] Then the jack control system 25 contracts the telescopic end of the main jack 3 through the jack pump station 11. When the axial force monitoring system 25 detects that the axial force inside the steel support 2 decreases, the jack control system 24 causes the telescopic end of the main jack 3 to push the movable head 1 again, and then restarts the vertical jack 5, increasing the downward force and pressure time of the vertical jack 5 to make the steel wedge block 13 more firm, and then contracts the telescopic end of the main jack 3 again. When the axial force monitoring system 25 detects that the axial force inside the steel support 2 remains unchanged, the telescopic end of the main jack 3 is completely contracted.

[0087] Then the telescopic end of the transverse jack 4 is extended to move the two main jacks 3 away from each other, and the pin 20 is pulled out from the socket 23 through the steel strand 17 and the slider 19, and the arc-shaped hoop plate 22 is driven to rotate through the steel chain 21.

[0088] Remove the clamp-type steel support joint fastening device and move to the next steel support to be constructed.

[0089] The present invention has been described in detail above with reference to the embodiments of the accompanying drawings. A person skilled in the art can make various modifications to the present invention based on the above description. Therefore, certain details in the embodiments should not be construed as limiting the present invention. The scope of protection of the present invention shall be determined by the scope defined in the appended claims.

Claims

1. A clamp-type steel support active head fastening device, wherein the connecting shaft of the active head (1) is inserted into the steel support (2) and the insertion length is adjustable, and a steel wedge (13) is inserted into the gap between the active head (1) and the steel support (2), characterized in that: The fastening device comprises: a steel frame (8), a bottom of the steel frame (8) being provided with a plurality of spaced arc-shaped limiting plates (12), the bottom of the arc-shaped limiting plates (12) being formed with arc-shaped grooves for fitting with the outer surface of the steel support (2); Two main jacks (3) are provided at the bottom of the steel frame (8), the two main jacks (3) are respectively located on both sides of the movable head (1) and the distance between them is adjustable, the main jacks (3) are used to push the inner side of the movable head (1) so that the movable head (1) extends out from the steel support (2), and the steel frame (8) is provided with a driving mechanism for driving the main jacks (3) to move; A vertical jack (5) mounted on the steel frame (8), wherein the telescopic end of the vertical jack (5) is vertically downwardly used to press the steel wedge (13) down into the gap between the steel support (2) and the movable head (1); A jack pump station (11) is provided on the steel frame (8), and the jack pump station (11) is connected to the main jack (3) and the vertical jack (5).

2. The clamp-type steel support movable head fastening device according to claim 1, characterized in that: The driving mechanism comprises two transverse jacks (4) mounted on the bottom of the steel frame (8) and a main jack fixing frame (6) mounted on the telescopic end of the transverse jacks (4), the main jack (3) being mounted on the main jack fixing frame (6) and being perpendicular to the transverse jacks (4), and the transverse jacks (4) being connected to the jack pump station (11); The bases of the two transverse jacks (4) are coaxially connected and the extension directions of the telescopic ends are opposite, so that the two main jacks (3) can approach or move away from each other on both sides of the movable head (1).

3. The clamp-type steel support movable head fastening device according to claim 1, characterized in that: It also includes two arc-shaped hoop plates (22), which are respectively hinged to the two ends of one of the arc-shaped limiting plates (12), and the inner sides of the two arc-shaped hoop plates (22) are arc-shaped for fitting with the outer surface of the steel support (2), and the two arc-shaped hoop plates (22) are spliced ​​with the arc-shaped limiting plates (12) so that the inner sides form a circular hole wrapped around the outer surface of the steel support (2), thereby temporarily fixing the steel frame (8) and the steel support (2); The two arc-shaped hoop plates (22) are drivingly connected to the driving mechanism.

4. A clamp-type steel support movable head fastening device according to claim 2 or 3, characterized in that: Also includes: Two sliders (19), both sides of the arc-shaped limit plate (12) hinged to the arc-shaped hoop plate (22) are vertically provided with sliding grooves (18), the two sliders (19) are respectively located in the corresponding sliding grooves (18), the top of the slider (19) is provided with a steel strand (17), and the other end of the steel strand (17) is connected to the telescopic end of the transverse jack (4); Two steel chains (21) are provided with slots on both sides of the corresponding arc-shaped limiting plates (12) so that the slide groove (18) is connected to the outside world. One side of the slider (19) is provided with an extension section extending to the outside world through the slot. One end of the two steel chains (21) is connected to the corresponding extension section, and the other end is connected to the outer side of the corresponding arc-shaped hoop plate (22).

5. The clamp-type steel support movable head fastening device according to claim 4, characterized in that: A latch (20) is provided at the bottom of the two sliders (19), and the latch (20) is slidably disposed in the slide groove (18); The tops of the two arc-shaped hoop plates (22) are provided with sockets (23) for inserting the latch pins (20).

6. The clamp-type steel support movable head fastening device according to claim 4, characterized in that: Two fixed pulleys (16) and two universal pulleys (15) are provided at the bottom of the steel frame (8), the two fixed pulleys (16) are respectively located in the sliding grooves (18) of the corresponding arc-shaped limiting plates (12), and the two universal pulleys (15) are respectively located on one side of the transverse jack (4). One end of the steel strand (17) passes around the fixed pulley (16) and the universal pulley (15) and then is connected to the transverse jack (4).

7. The clamp-type steel support joint fastening device according to claim 1, characterized in that: It also includes a jack control system and an axial force monitoring system, wherein the axial force monitoring system is used to monitor the axial force of the steel support (2) in real time, and the jack control system is used to control the vertical jack (5), the driving mechanism, and the main jack (3), and receive axial force data from the axial force monitoring system to adjust the thrust of the main jack (3) and the vertical jack (5) according to the axial force data, so that the steel support (2) reaches the set axial force.

8. A method for using the clamp-type steel support active head fastening device according to claim 1, characterized in that: The specific steps include: S1. After the steel support (2) is installed at the construction location, a hoisting device is provided, and the fastening device is hoisted to the top of the steel support (2) using the hoisting device, and the arc-shaped groove of the arc-shaped limiting plate (12) is fitted to the outer surface of the steel support (2); S2. Determine the set axial force of the steel support (2) according to the supporting force required by the foundation pit retaining structure; S3, adjusting the distance between the two main jacks (3) through the driving mechanism, so that the two main jacks move between the steel support (2) and the movable head (1); S4, then start the two main jacks (3) to push the movable head (1) so that the movable head (1) extends from the steel support (2), then gradually increase the axial force of the main jacks (3), and after the axial force of the steel support (2) reaches the set axial force, lock the main jacks (3); S5. After the last steel wedge (13) is inserted into the gap between the movable head (1) and the steel support (2), the vertical jack (5) is started, so that the telescopic end of the vertical jack (5) extends to press down the steel wedge (13), and after the steel wedge (13) is pressed down into place, the vertical jack (5) maintains the axial force unchanged to continuously apply pressure to the steel wedge (13), and after the pressure application time is reached, the telescopic section of the vertical jack (5) is retracted; S6, the telescopic end of the main jack (3) is retracted, and the axial force of the steel support (2) is monitored in real time; if the axial force of the steel support (2) remains unchanged, it is determined that the steel support (2) and the movable head (1) are fastened, otherwise the above steps S4 and S5 are repeated until the axial force of the steel support (2) remains unchanged when the telescopic end of the main jack (3) is retracted.

9. The method for using the clamp-type steel support movable head fastening device according to claim 8, characterized in that: The fastening device further comprises two arc-shaped hoop plates (22) hingedly connected to both ends of one of the arc-shaped limiting plates (12), wherein the inner sides of the arc-shaped hoop plates (22) are arc-shaped; After the fastening device is hoisted to the top of the steel support (2), the angles of the two arc-shaped hoop plates (22) are adjusted by the driving mechanism so that the arc-shaped hoop plates (22) are spliced ​​with the arc-shaped limit plates (12) so that a circular hole is formed on the inner side to wrap around the outer surface of the steel support (2), thereby temporarily fixing the fastening device to the steel support (2).

10. The method for using the clamp-type steel support movable head fastening device according to claim 8, characterized in that: The fastening device also includes a jack control system and an axial force monitoring system. In steps S4 to S6, the axial force of the steel support (2) is monitored in real time by the axial force monitoring system to determine whether the axial force of the steel support (2) reaches the set axial force, and the jack control system receives the axial force monitored by the axial force monitoring system. In step S6, the jack control system contracts the telescopic end of the main jack (3). When the jack control system receives that the axial force of the steel support (2) becomes smaller, the telescopic end of the main jack (3) is extended again so that the axial force of the steel support (2) reaches the set axial force again, and then the vertical jack (5) is restarted, and the downward force and pressure time of the vertical jack (5) are increased to make the steel wedge (13) more secure; if the jack control system (24) receives that the axial force of the steel support (2) remains unchanged, the telescopic end of the main jack (3) is contracted again.

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