A steel support movable head device which is easy to disassemble and has a safety locking function

Abstract

The present invention discloses a steel support active head device which is easy to disassemble and has a safety locking function, including a plug-in buckle plate, the top center of the plug-in buckle plate is fixed with a jack and a lifting cylinder in sequence from the inside to the outside, the top of the lifting cylinder is fixedly connected to the bottom of the lifting cylinder end seat, the lifting section of the jack passes through the lifting cylinder end seat and is fixedly connected to the bottom of the movable plate located above it, the top surface of the movable plate is fixedly connected with a support plate, and also includes a fixed pad that is movably connected to the plug-in buckle plate; the surface of the fixed pad is provided with a plurality of mutually parallel tenons, the head ends of one side of the plurality of tenons are step-shaped structures, and there is a gap between the bottom surface of the step and the surface of the fixed pad; the bottom surface of the plug-in buckle plate is provided with a plurality of concentric circular ring-shaped pressing plates, the plurality of circles of pressing plates are opened from one end to the other end to form slots matching the number of tenons, and the bottom of the pressing plate at the other end of the slot is provided with an insertion eye. The device is easy to disassemble and has a safety locking function, and can realize rapid overall disassembly and assembly.

Description

Technical Field

[0001] The invention relates to a steel support active head device, in particular to a steel support active head device which is easy to disassemble and assemble and has a safety locking function. Background Art

[0002] In the field of foundation pit engineering, steel supports account for a large proportion. Steel supports are recyclable, easy to install, and have a short construction period. As the connection point between the steel support and the enclosure system, the performance of the flexible head directly determines the safety of the steel support structure. Currently, the flexible heads commonly used for jacking are mostly welded to connect the waist beam and the support at both ends, and lack the necessary force protection measures. When an accident occurs to the jack, the force on the flexible head is damaged, which brings serious consequences. The on-site welding of the flexible head requires high welding technology, and the quality is difficult to guarantee, and the on-site operation is difficult. Summary of the invention

[0003] The object of the present invention is to provide a steel support active head device which is easy to disassemble and has a safety locking function. The device is easy to disassemble and has a safety locking function, and can realize rapid overall disassembly and assembly.

[0004] The technical solution of the present invention is as follows: a steel support active head device which is easy to disassemble and has a safety locking function, comprises a plug-in buckle plate, a jack and a lifting cylinder are fixed in sequence from the inside to the outside at the center of the top surface of the plug-in buckle plate, the top of the lifting cylinder is fixedly connected to the bottom surface of the lifting cylinder end seat, the lifting section of the jack passes through the lifting cylinder end seat and is fixedly connected to the bottom of the movable plate located above it, the top surface of the movable plate is fixedly connected to the support plate, and also comprises a fixed pad plate which is movably engaged with the plug-in buckle plate; a plurality of mutually parallel tenons are arranged on the surface of the fixed pad plate, the head ends of one side of the plurality of tenons are step-shaped structures, and there is a gap between the bottom surface of the step and the surface of the fixed pad plate; a plurality of concentric circular pressure plates are arranged on the bottom surface of the plug-in buckle plate, the plurality of pressure plates are opened from one end to the other end to form slots whose number matches the tenons, and an insertion eye is arranged on the bottom of the pressure plate at the other end of the slot.

[0005] In the aforementioned steel support active head device which is easy to disassemble and has a safety locking function, the top and bottom surfaces of the movable plate are fixed with locking bolts of short rods and locking bolts of long rods in corresponding circular arrays. After the locking bolts of the short rod pass through the support plate, the top surface thereof is fixed by a locking nut, and after the locking bolts of the long rod pass through the end seat of the jacking cylinder, both ends thereof are fixed by locking nuts.

[0006] In the aforementioned steel support active head device which is easy to disassemble and has a safety locking function, the bottom edge of the end seat of the jacking cylinder is provided with a ring array of stiffening plates, which are fixed together with the outer wall of the jacking cylinder.

[0007] In the aforementioned steel support movable head device which is easy to disassemble and has a safety locking function, there are three tenons, and a protrusion is provided at the rear of the middle tenon's step-shaped structure; a guard plate extending inward is provided on the inner side wall of the innermost circle pressure plate away from the open end of the slot.

[0008] In the aforementioned steel support movable head device which is easy to disassemble and has a safety locking function, a reinforcing plate is fixedly connected to the bottom of the movable plate, and the reinforcing plate is fixedly connected to the top of the lifting section of the jack.

[0009] Beneficial effects of the present invention: Compared with the prior art, the present invention has the following convenient advantages:

[0010] (1) In the whole device, the waist beam and the steel support can be connected together through the device by horizontally clamping the fixed pad and the plug-in buckle plate. The installation and disassembly are very convenient, the process is simple, and the on-site installation work is reduced;

[0011] (2) The main parts of the flexible head are all independently mechanically connected and can be disassembled and re-used at any time;

[0012] (3) In addition to the connection and support by the jack, the end seat of the jacking cylinder and the movable plate are also provided with locking bolts distributed in a circular array. The locking bolts on both sides of the end seat of the jacking cylinder are locked by locking nuts to form a force locking structure to prevent the support structure from failing and causing accidents after the jack fails.

[0013] (4) Corresponding flexible joints can be prefabricated according to different specifications, which is suitable for factory production and building modular construction sites. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 It is a schematic diagram of the exploded structure of the device of the present invention;

[0015] Attached Figure 2 It is a schematic diagram of the combined structure of the device of the present invention;

[0016] Attached Figure 3 It is a structural schematic diagram of the fixed pad of the present invention;

[0017] Attached Figure 4 It is a structural schematic diagram of the plug-in buckle plate of the present invention;

[0018] Attached Figure 5 It is a structural schematic diagram of the jacking cylinder of the present invention;

[0019] Attached Figure 6 It is a structural schematic diagram of the movable plate and the supporting plate;

[0020] Attached Figure 7 It is a structural schematic diagram of the jack and the movable plate.

[0021] Figure numerals: 1-waist beam, 2-fixed pad, 3-insertion and hanging buckle plate, 4-lifting cylinder, 5-jack, 6-lifting cylinder end seat, 7-movable plate, 8-support plate, 9-steel support, 10-stiffening plate, 11-locking bolt, 12-locking nut, 13-tenon, 14-pressure plate, 15-slot, 16-eye, 17-guard plate, 18-bump, 19-reinforcement plate. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0023] Embodiment of the present invention: A steel support movable head device which is easy to disassemble and has a safety locking function, as shown in the attached Figure 1-7 As shown, it includes: a plug-in buckle plate 3, a jack 5 and a jacking cylinder 4 are welded and fixed in sequence from the inside to the outside at the center of the top surface of the plug-in buckle plate 3, the top of the jacking cylinder 4 is welded and fixedly connected to the bottom surface of the jacking cylinder end seat 6, the jacking section of the jack 5 passes through the through hole in the center of the jacking cylinder end seat 6 and is fixedly connected to the bottom of the movable plate 7 located above the jacking cylinder end seat 6, the top surface of the movable plate 7 is fixedly connected to the support plate 8, and also includes a fixed pad 2 that is movably connected to the plug-in buckle plate 3; the surface of the fixed pad 2 is provided with a plurality of mutually parallel tenons 13, as shown in the attached Figure 3 As shown. The surface of the fixed pad 2 in the embodiment of the present invention is provided with three mutually parallel tenons 13. The three tenons 13 extend from one end of the fixed pad 2 to the other end, and one end of the three tenons 13 is a step-shaped structure, and there is a gap between the bottom surface of the step-shaped structure and the surface of the fixed pad 2; the bottom surface of the plug-in buckle plate 3 is provided with two circles of concentric circular pressure plates 14. The multi-circle pressure plate 14 is grooved from one end to the other end, and its number and size match the tenons 13. The groove at one end of the multi-circle pressure plate 14 completely penetrates the pressure plate to form a slot 15, and the other end only has a groove at the bottom of the pressure plate to form an insertion eye 16.

[0024] The method for installing and locking the movable head using the above device includes the following steps:

[0025] First, the bottom surface of the fixing pad 2 is welded and fixed to the surface of the waist beam 1, so that the tenon 13 on the surface of the fixing pad 2 is arranged vertically, and the mortise 16 is located at the upper part. The steel support 9 is welded and fixed to the surface of the support plate 8.

[0026] Then, the steel support 9 with the main device is connected to the waist beam 1 by hoisting or other means. When connecting, align the tenon 13 with the slot 15, insert it into the slot 15 from the open end of the slot 15, so that the step-shaped structure at the head end of the tenon 13 is inserted into the insertion hole 16. When the two are pressed tightly and moved up and down, the plug-in buckle plate 3 and the fixed pad 2 can be combined together.

[0027] After the steel support 9 is connected to the waist beam 1, the lifting section of the jack 5 can be controlled to push upward through the lifting section, thereby pushing the movable plate 7, the support plate 8 and the steel support 9 to the required height.

[0028] When removing the support, first release the pressure of the jack 5, separate the support plate 8 from the steel support 9, and separate the main device from the steel support 9, and then separate the main device from the waist beam 1 according to the reverse operation of the combination of the plug-in buckle plate 3 and the fixed pad 2. After the main device is recovered, it will be kept for next use.

[0029] The top surface of the movable plate 7 is welded and fixed with a locking bolt 11 of a short rod in an annular array, and the bottom surface thereof is welded and fixed with a locking bolt 11 of a long rod in an annular array. The support plate 8 is provided with a through hole in an annular array matching the number of the locking bolts 11 of the short rod, and the jacking cylinder end seat 6 is provided with a through hole in an annular array matching the number of the locking bolts 11 of the long rod. After the locking bolt 11 of the short rod passes through the through hole of the support plate 8, its top surface is fixed by a locking nut 12, thereby fixing the movable plate 7 and the support plate 8 together. After the locking bolt 11 of the long rod passes through the through hole of the jacking cylinder end seat 6, the two ends of the top and bottom surfaces of the jacking cylinder end seat 6 are fixed by two locking nuts 12. The support function of the movable plate 7 and its upper components is achieved by the locking bolt 11 of the long rod. During use, after the steel support 9 is connected to the waist beam 1, the locking nuts 12 on the locking bolts 11 of the long rods on both sides of the jacking cylinder end seat 6 are loosened by a certain pitch, and then the jack 5 pushes the movable plate 7 to drive the locking bolts 11 of the long rods to move upward to the required height, and then the locking nuts 12 on the locking bolts 11 of the long rods on both sides of the jacking cylinder end seat 6 are locked. The locking bolts 11 of the long rods play a major supporting role.

[0030] When removing the support, first release the pressure from the jack 5, and then loosen the locking nut 12 on the locking bolt 11 of the long rod.

[0031] The bottom edge of the lifting cylinder end seat 6 is provided with a ring array of stiffening plates 10, which are welded and fixed to the outer wall of the lifting cylinder 4. The lifting cylinder end seat 6 is the main pressure-bearing component, and its pressure-bearing capacity can be improved by arranging the stiffening plates 10.

[0032] There are three tenons 13, and a protrusion 18 is provided at the rear of the step-shaped structure of the middle tenon 13; a guard plate 17 extending inward is provided on the inner side wall of the innermost circle pressure plate 14 away from the opening end of the slot 15. After the tenon 13 is completely inserted into the slot 15, the protrusion 18 is just located below the guard plate 17 and is wrapped by the guard plate 17. The guard plate 17 and the protrusion 18 are used in combination to further limit the displacement of the fixing pad 2 and the plug-in buckle plate 3 in the vertical direction.

[0033] The bottom of the movable plate 7 is fixedly connected with a reinforcing plate 19, and the reinforcing plate 19 is fixedly connected to the top of the lifting section of the jack 5. The contact area between the lifting section of the jack 5 and the bottom surface of the movable plate 7 is increased to avoid excessive local pressure.

[0034] During the use of the device of the present invention, only the fixed pad 2 and the support plate 8 are connected to the waist beam 1 and the steel support 9 by welding. The ports connected to the fixed pad 2 and the support plate 8 are mechanically connected in a manner that is easy to load and unload, which greatly improves the efficiency and quality of on-site installation.

[0035] Stress verification of main connection positions:

[0036] Assumptions are made on the material specifications of the above device. Assumptions: Waist beam 1, H400x400x13x21 double waist beam; fixed pad 2, bottom plate Φ600t30 steel plate; plug-in buckle plate 3, bottom plate Φ700t30 steel plate; jacking cylinder 4, Φ400t20 steel cylinder, with end seat on the top; movable plate 7, bottom plate Φ700t20 steel plate; support plate 8, Φ800t16 steel plate. The verification contents are as follows:

[0037] (1) Shear force verification at the bump 18:

[0038] When the support is only connected to the movable head, the projection 18 bears the shear force caused by the gravity of the adjacent section support.

[0039] Assume that the protrusion 18 is connected to the tenon 13 by welding, the fillet weld width is 8mm, and the weld length is 110mm. Assume that the steel support 9 is a steel pipe with a diameter of 600 and a wall thickness of 12, and the adjacent section length is 10m. The verification is as follows:

[0040] Fillet weld resistance:

[0041] Shear force at bump 18: Q = 1.35·ρ·g·L = 1.35·172.7·10·5 = 23.4 kN

[0042] The resistance of the fillet weld at the convex block 18 is much greater than the shear force, and the shear force calculation of the active joint meets the requirements;

[0043] (2) Calculation of bending moment at 13 mortise and tenon joints:

[0044] When the support is only connected to the movable head, the bending moment at the connection caused by the weight of the support is borne by the tenon of the tenon 13.

[0045] There are three mortises in total, and their cross-sectional dimensions are 19*30 mm. The central mortise 13, which is subjected to the greatest force, is assumed to bear 1 / 2 of the bending moment.

[0046] Bending moment at connection:

[0047] Verification:

[0048]

[0049] Where: T is the tensile force caused by the bending moment on the central tenon 13, and N is the resistance of the material at the tenon joint. The bending moment force verification calculation at the tenon 13 is satisfied;

[0050] (2) Force verification of locking bolt 11:

[0051] After the jack 5 applies the preload, assuming that the jack 5 fails suddenly, the supporting axial force is completely borne by the locking bolt 11. Generally, the supporting axial force is less than 2000kN. The verification includes two aspects: locking nut 12 and locking bolt 11,

[0052] a. Calculation of locking nut 12:

[0053] Use 10.9 grade M27 high-strength nuts with a pre-tension force of P=290kN.

[0054] Nut tensile strength N = 15 0.8P = 15 0.8 290 = 3480 kN > 2000 kN

[0055] b. Calculation of locking bolt 11:

[0056] Assuming that the locking bolt 11 is of HRB400 grade strength and is calculated using Class A section in the steel structure, the lifting stroke of the jack is 300mm.

[0057] Stability of screw against axial compression The stability coefficient is 0.972.

[0058] After checking the forces on the locking bolt 11 and the locking nut 12, it was found that the forces on the locking bolt 11 could meet the requirements.

Claims

1. A steel support movable head device which is easy to disassemble and has a safety locking function, characterized in that: The invention comprises a plug-in buckle plate (3), a jack (5) and a lifting cylinder (4) are fixed in sequence from the inside to the outside at the center of the top surface of the plug-in buckle plate (3), the top of the lifting cylinder (4) is fixedly connected to the bottom surface of the lifting cylinder end seat (6), the lifting section of the jack (5) passes through the lifting cylinder end seat (6) and is fixedly connected to the bottom of a movable plate (7) located above it, the top surface of the movable plate (7) is fixedly connected to a support plate (8), and also comprises a fixed plate (8) movably connected to the plug-in buckle plate (3) The fixing pad (2) is provided with a plurality of mutually parallel tenons (13) on the surface of the fixing pad (2), the head ends of one side of the plurality of tenons (13) are step-shaped structures, and there is a gap between the bottom surface of the step and the surface of the fixing pad (2); the bottom surface of the plug-in buckle plate (3) is provided with a plurality of concentric circular pressure plates (14), the plurality of pressure plates (14) are opened from one end to the other end to form slots (15) whose number and size match the tenons (13), and the slots (15) are also The bottom of the pressure plate (14) at one end is provided with an insertion hole (16); the top and bottom surfaces of the movable plate (7) are fixed with a locking bolt (11) of a short rod and a locking bolt (11) of a long rod in a corresponding annular array; after the locking bolt (11) of the short rod passes through the support plate (8), its top surface is fixed by a locking nut (12); after the locking bolt (11) of the long rod passes through the end seat (6) of the jacking cylinder, its two ends are fixed by locking nuts (12); the insertion tenon The number of the tenons (13) is 3, and a protrusion (18) is provided at the rear of the step-shaped structure of the middle tenon (13); a guard plate (17) extending inward is provided on the inner side wall of the innermost circle pressure plate (14) away from the opening end of the slot (15), and the three tenons (13) extend from one end of the fixed pad (2) to the other end; after the tenon (13) is completely inserted into the slot (15), the protrusion (18) is located below the guard plate (17) and is wrapped by the guard plate (17).

2. The steel support movable head device which is easy to disassemble and has a safety locking function according to claim 1 is characterized in that: The bottom edge of the lifting cylinder end seat (6) is provided with a ring array of stiffening plates (10), and the stiffening plates (10) are fixed together with the outer wall of the lifting cylinder (4).

3. The steel support movable head device which is easy to disassemble and has a safety locking function according to claim 1 is characterized in that: The bottom of the movable plate (7) is fixedly connected with a reinforcing plate (19), and the reinforcing plate (19) is fixedly connected to the top of the lifting section of the jack (5).

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