CN107882357B - Steel structure support frame with supporting point adjusting and auxiliary supporting functions - Google Patents

Abstract

The invention discloses a steel structure support frame with support point adjusting and auxiliary supporting functions, which comprises a main support frame, wherein an auxiliary support frame is arranged in the main support frame, the lower end of the auxiliary support frame is provided with a position fixing device, the upper end of the auxiliary support frame is provided with a supporting device, the side end of the main support frame is provided with the auxiliary supporting device, the position fixing device consists of a positioning hole, a circular through hole, a screw rod and a fixing nut, the supporting device consists of a small-sized fixing bearing, a rotating shaft, a gear, a screwing block, a rectangular bayonet, a rectangular clamping block, a supporting seat, a screw hole and a fastening screw, and the auxiliary supporting device consists of a groove, a supporting rod, a circular long groove, a positioning pin, a reset spring, a rectangular sliding groove, a rectangular sliding block. The invention has the advantages of simple structure and strong practicability.

Description

Steel structure support frame with supporting point adjusting and auxiliary supporting functions

Technical Field

The invention relates to the field of steel structure support frames, in particular to a steel structure support frame with support point adjusting and auxiliary supporting functions.

Background

The steel structure has the characteristics of light dead weight, high strength, good ductility, strong earthquake resistance and the like, and on the traditional building site, a steel support frame is usually adopted to be connected with the civil structure and the ground in a supporting way, but the service life of the traditional steel support frame is greatly shortened due to unidirectional linear stress; when a plurality of steel supports are used for connecting a civil structure and ground supports, the supporting points of the steel supports are stressed differently due to the deformation of the civil structure in the forming process, so that certain steel supports are damaged due to overlarge stress, and the steel supports are inconvenient to assemble and disassemble, so that the steel supports with the supporting point adjusting and auxiliary supporting functions are required, and the service life of the steel supports is greatly prolonged by additionally arranging the supporting rods to convert the one-way straight line stress into two-point stress; the supporting device is arranged, so that the stress of the supporting point of the steel supporting frame can be adjusted at any time in the using process of the steel supporting frame, the problem that some steel supporting frames are damaged due to overlarge stress is solved, and the steel supporting frame is convenient to assemble and disassemble, so that the burden of workers is greatly reduced.

Disclosure of Invention

The invention aims to solve the problems and designs a steel structure support frame with support point adjusting and auxiliary supporting functions.

The technical scheme of the invention is that the steel structure support frame with the support point adjusting and auxiliary supporting functions comprises a main support frame, an auxiliary support frame is arranged in the main support frame, the upper end part of the auxiliary support frame penetrates through the upper end of the main support frame to extend out, a position fixing device is arranged at the lower end of the auxiliary support frame, a supporting device is arranged at the upper end part of the auxiliary support frame, an auxiliary supporting device is arranged at the side end of the main support frame, the position fixing device consists of a plurality of positioning holes which are uniformly formed in the outer walls of the two sides of the main support frame at equal intervals along the height direction of the main support frame, a circular through hole which is formed in the lower end of the auxiliary support frame corresponding to the positioning holes, a screw rod which penetrates through the positioning holes and the circular through hole and a fixing nut which is sleeved at the two ends of the screw rod, the supporting, A driving rotating shaft and a driven rotating shaft which are respectively arranged between the small-sized fixed bearings, a driving gear and a driven gear which are respectively sleeved on the driving rotating shaft and the driven rotating shaft, a twisting block which is fixedly arranged at the end, where one end of the driving rotating shaft penetrates through the inner wall of the auxiliary supporting frame and extends out, a rectangular bayonet which is arranged at the upper end surface of the auxiliary supporting frame along the width direction and corresponds to the middle position between the driving gear and the driven gear, a rectangular clamping block which extends into the middle position between the driving gear and the driven gear through the rectangular bayonet, a supporting seat which is arranged at the upper end of the rectangular clamping block, screw holes which are respectively arranged at the outer walls at the two sides of the upper end of the auxiliary supporting frame and correspond to the rectangular clamping block, and a fastening screw which is screwed into the screw holes, wherein the auxiliary supporting device is composed of a groove which is arranged at a certain length on the outer, One end of the positioning pin is arranged in the circular long groove, the other end of the positioning pin can penetrate through the outer port of the circular long groove to extend out, a reset spring is arranged between the bottom of the circular long groove and the positioning pin, a rectangular sliding groove is arranged on the outer wall of two sides of the supporting rod and is close to the outer port of the circular long groove, the rectangular sliding groove is arranged in the rectangular sliding groove and can slide along the length direction of the rectangular sliding groove, an L-shaped round hole which is arranged at one end of the rectangular sliding groove, which is close to the circular long groove, and is communicated with the inner bottom surface of the circular long groove, a steel wire line, one end of the steel wire line, which is fixedly connected with the rectangular sliding block, the other end of the steel wire line, which penetrates through the L-shaped round hole and extends, the supporting rod is inserted into the positioning groove through the positioning pin, so that an auxiliary supporting effect is achieved.

The utility model discloses a supporting device, including main tributary strut, auxiliary support frame, spout, auxiliary support frame, main tributary strut, auxiliary support frame upper end position, the main tributary strut is outside, the mutual corresponding position of main tributary strut inner chamber both sides wall just has opened a set of spout respectively along its direction of height certain distance, the auxiliary support frame accessible the spout inserts main tributary strut inner chamber, auxiliary support frame length is greater than the spout height.

The twisting blocks are hexagonal prisms, so that the operation of a wrench is facilitated, the rectangular fixture blocks respectively correspond to two side faces of the driving gear and the driven gear, a plurality of tooth grooves are uniformly formed in the rectangular fixture blocks along the height direction of the driving gear and the driven gear at equal intervals, and gear teeth outside the driving gear and the driven gear can be meshed with the tooth grooves.

The length of the groove is slightly larger than that of the supporting rod, the supporting rod can be completely placed into the groove along the length direction of the supporting rod, when the upper end part of the supporting rod is positioned in the groove, the positioning pin can be inserted into the positioning groove, and the upper end part of the supporting rod and the bottom of the groove are in mutual contact support.

The fixed end of the return spring is fixedly arranged on the inner bottom surface of the circular long groove, the telescopic end of the return spring is fixedly arranged on the inner end part of the positioning pin, the outer end part of the circular long groove slightly extends inwards for a certain distance, the inner end part of the positioning pin slightly extends outwards for a certain distance, and the positioning pin cannot fall off from the circular long groove.

The outer wall of the main support frame is provided with a small tool box, and small maintenance equipment is placed in the small tool box.

The supporting rod can be a telescopic rod, and the steel wire is made of a metal material with high tensile strength.

The main support frame, the auxiliary support frame and the support rod are made of steel materials.

The positions of the grooves and the positions of the sliding grooves formed in the main supporting frame are not in conflict, and the thickness of the grooves can be set to be 5-10 cm.

The main supporting frame and the lower end parts of the supporting rods are designed into ladder shapes, the cross section area of the supporting ends is smaller than that of the upper ends and the supporting ends are placed in a ladder shape, and a plurality of slideways are arranged on the cross section of the supporting ends at equal intervals along the width of the cross section.

The steel structure support frame with the support point adjusting and auxiliary supporting functions, which is manufactured by the technical scheme of the invention, changes the one-way straight line stress into two-point stress by additionally arranging the support rod, thereby greatly prolonging the service life of the steel structure support frame; the supporting device is arranged, so that the stress of the supporting point of the steel supporting frame can be adjusted at any time in the using process of the steel supporting frame, the problem that some steel supporting frames are damaged due to overlarge stress is solved, and the steel supporting frame is convenient to assemble and disassemble, so that the burden of workers is greatly reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of the steel structure support frame with supporting point adjustment and auxiliary supporting functions according to the present invention;

FIG. 2 is a schematic view of the position fixing device according to the present invention;

FIG. 3 is a side view of the support device of the present invention;

FIG. 4 is a front view of the support device of the present invention;

FIG. 5 is a schematic view of the structure of the auxiliary supporting device of the present invention;

in the figure, 1, a main supporting frame; 2. an auxiliary support frame; 3. a position fixing device; 4. a support device; 5. positioning holes; 6. a circular through hole; 7. a screw; 8. a small fixed bearing; 9. a driving rotating shaft; 10. a driven rotating shaft; 11. a driving gear; 12. a driven gear; 13. twisting the block; 14. a rectangular bayonet; 15. a rectangular fixture block; 16. a supporting seat; 17. a screw hole; 18. tightening the screw; 19. a groove; 20. a support bar; 21. a circular long groove; 22. positioning pins; 23. a return spring; 24. a rectangular chute; 25. a rectangular slider; 26. an L-shaped circular hole; 27. a steel wire; 28. a pulley block; 29. positioning a groove; 30. fixing a nut; 31. and an auxiliary supporting device.

Detailed Description

The invention is described in detail below with reference to the accompanying drawings, and as shown in fig. 1-5, a steel structure support frame with support point adjusting and auxiliary supporting functions comprises a main support frame 1, an auxiliary support frame 2 is arranged in the main support frame 1, the upper end of the auxiliary support frame 2 extends out of the upper end of the main support frame 1, a position fixing device 3 is arranged at the lower end of the auxiliary support frame 2, a supporting device 4 is arranged at the upper end of the auxiliary support frame 2, an auxiliary supporting device 31 is arranged at the side end of the main support frame 1, the position fixing device 3 is composed of a plurality of positioning holes 5 uniformly arranged on the outer wall of the two sides of the main support frame 1 at equal intervals along the height direction of the main support frame, a circular through hole 6 arranged at the lower end of the auxiliary support frame 2 corresponding to the positioning hole 5, a screw rod 7 penetrating through the positioning hole, the supporting device 4 is composed of a group of small-sized fixed bearings 8 which are respectively arranged on two side walls of an inner cavity at the upper part of the auxiliary supporting frame 2 along two ends of the width direction and corresponding positions with each other, a driving rotating shaft 9 and a driven rotating shaft 10 which are respectively arranged between the small-sized fixed bearings 8, a driving gear 11 and a driven gear 12 which are respectively sleeved on the driving rotating shaft 9 and the driven rotating shaft 10, a screwing block 13 which is fixedly arranged at one end of the driving rotating shaft 9 and penetrates through the inner wall of the auxiliary supporting frame 2 and extends out of the end, a rectangular bayonet 14 which is arranged at the upper end surface of the auxiliary supporting frame 2 along the width direction and corresponding to the middle position between the driving gear 11 and the driven gear 12, a rectangular clamping block 15 which extends into the middle position between the driving gear 11 and the driven gear 12 through the rectangular bayonet 14, a supporting seat 16 which is arranged at the upper end of the rectangular clamping block 15, screw holes 17, the auxiliary supporting device 31 is composed of a groove 19 which is formed in the outer wall of one side end of the main supporting frame 1 and has a certain length along the height direction, a supporting rod 20 which is arranged in the groove 19, a circular long groove 21 which is formed in the upper end of the supporting rod 20 and corresponds to the inner wall directions of two sides of the groove 19, a positioning pin 22 which is arranged in the circular long groove 21 and has one end capable of penetrating through the outer port of the circular long groove 21 and extending out, a return spring 23 which is arranged between the bottom of the circular long groove 21 and the positioning pin 22, a rectangular sliding groove 24 which is formed in the outer wall of two sides of the supporting rod 20 and is close to the outer port of the circular long groove 21 and has a certain distance along the length direction of the supporting rod 20, a rectangular sliding block 25 which has a lower end part arranged in the rectangular sliding groove 24 and is capable of sliding along the length direction of the rectangular sliding groove 24, an L-shaped round hole 26 which is formed in The support device comprises a connected steel wire 27, a pulley block 28 arranged in the inner cavity of the L-shaped round hole 26 and used for transitionally supporting the steel wire 27, and a plurality of positioning grooves 29 uniformly formed on two side walls of the groove 19 corresponding to the positions of the positioning pins 22 and at equal intervals along the length direction of the positioning pins, wherein the support rod 20 is inserted into the positioning grooves 29 through the positioning pins 22 so as to realize the auxiliary supporting function; two side walls of the inner cavity of the main support frame 1 correspond to each other and are respectively provided with a group of sliding chutes at certain distances along the height direction, the auxiliary support frame 2 can be inserted into the inner cavity of the main support frame 1 through the sliding chutes, the length of the auxiliary support frame 2 is greater than the height of the sliding chutes, and the upper end part of the auxiliary support frame 2 is positioned outside the main support frame 1; the screwing block 13 is in a hexagonal prism shape, so that the operation of a wrench is facilitated, the rectangular fixture blocks 15 respectively correspond to two side surfaces of the driving gear 11 and the driven gear 12, a plurality of tooth grooves are uniformly formed in the height direction of the driving gear 11 and the driven gear 12 at equal intervals, and gear teeth outside the driving gear 11 and the driven gear 12 can be meshed with the tooth grooves; the length of the groove 19 is slightly greater than that of the support rod 20, the support rod 20 can be completely placed in the groove 19 along the length direction, when the upper end part of the support rod 20 is positioned in the groove 19, the positioning pin 22 can be inserted into the positioning groove 29, and the upper end part of the support rod 20 is in contact with the bottom of the groove 19 for supporting; the fixed end of the return spring 23 is fixedly arranged with the inner bottom surface of the circular long groove 21, the telescopic end of the return spring 23 is fixedly arranged with the inner end of the positioning pin 22, the outer end of the circular long groove 21 slightly extends inwards for a certain distance, the inner end of the positioning pin 22 slightly extends outwards for a certain distance, and the positioning pin 22 cannot fall off from the circular long groove 21; the outer wall of the main support frame 1 is provided with a small tool box, and small maintenance equipment is placed in the small tool box; the support rod 20 can be a telescopic rod, and the steel wire 27 is made of a metal material with higher tensile strength; the main support frame 1, the auxiliary support frame 2 and the support rod 20 are made of steel materials; the position of the groove 19 is not in conflict with the position of a sliding groove arranged in the main support frame 1, and the thickness of the groove 19 can be set to be 5-10 cm; the lower end parts of the main support frame 1 and the support rod 20 are designed to be ladder-shaped, the cross section area of the support end is smaller than that of the upper end, the support end is placed in a ladder shape, and a plurality of slideways are arranged on the cross section of the support end at equal intervals along the width of the support end.

The invention is characterized in that the steel structure support frame with the support point adjusting and auxiliary supporting functions comprises a main support frame, an auxiliary support frame is arranged in the main support frame, the upper end part of the auxiliary support frame extends out of the upper end of the main support frame, a position fixing device is arranged at the lower end of the auxiliary support frame, a supporting device is arranged at the upper end part of the auxiliary support frame, an auxiliary supporting device is arranged at the side end of the main support frame, the position fixing device consists of a plurality of positioning holes which are uniformly formed in the outer wall of the two sides of the main support frame at equal intervals along the height direction of the main support frame, a circular through hole which is formed in the lower end of the auxiliary support frame corresponding to the positioning holes, a screw rod penetrating through the positioning holes and the circular through hole, and fixing nuts sleeved at the two ends of the screw rod, the supporting device consists of a group, A driving gear and a driven gear respectively sleeved on the driving rotating shaft and the driven rotating shaft, a twisting block fixedly arranged at one end of the driving rotating shaft, which penetrates through the inner wall of the auxiliary supporting frame and extends out of the extending end, a rectangular bayonet arranged at the upper end surface of the auxiliary supporting frame along the width direction and corresponding to the middle position between the driving gear and the driven gear, a rectangular clamping block extending into the middle position between the driving gear and the driven gear through the rectangular bayonet, a supporting seat arranged at the upper end of the rectangular clamping block, screw holes respectively arranged at the outer walls of two sides of the upper end of the auxiliary supporting frame and corresponding to the positions of the rectangular clamping block, and a set screw screwed into the screw holes A reset spring arranged between the bottom of the round long groove and the positioning pin, a rectangular sliding groove arranged on the outer wall of two sides of the supporting rod and close to the outer port of the round long groove and having a certain distance along the length direction of the supporting rod, a rectangular sliding block with the lower end part positioned in the rectangular sliding groove and capable of sliding along the length direction of the rectangular sliding groove, an L-shaped round hole arranged on one end of the rectangular sliding groove close to the round long groove and communicated with the inner bottom surface of the round long groove, a steel wire with one end fixedly connected with the rectangular sliding block and the other end penetrating through the L-shaped round hole and extending into the inner cavity of the round long groove and connected with the end part of the positioning pin, a pulley block arranged in the inner cavity of the L-shaped round hole and used for the transition support of the steel wire, and a plurality of, thereby greatly prolonging the service life of the steel support frame; the supporting device is arranged, so that the stress of the supporting point of the steel supporting frame can be adjusted at any time in the using process of the steel supporting frame, the problem that some steel supporting frames are damaged due to overlarge stress is solved, and the steel supporting frame is convenient to assemble and disassemble, so that the burden of workers is greatly reduced.

In the invention, the auxiliary support frame arranged in the main support frame can move up and down along the sliding groove arranged in the main support frame, and the position fixing device of the auxiliary support frame is realized by the screw rod penetrating through the positioning holes arranged on the outer walls of the two sides of the main support frame, the round through hole arranged at the lower end of the auxiliary support frame and the fixing nuts at the two ends of the screw rod. The utility model discloses a rectangular fixture block, including auxiliary stay frame, the piece is twisted to the workman, and the piece is twisted through the initiative pivot and is driven the driving gear function, driving gear and driven gear cooperation, and the teeth of a cogwheel and through the tooth's socket intermeshing that rectangular fixture block both sides end was equipped with of rectangle buckle male to it reciprocates to drive rectangular fixture block. The supporting seat at the upper end of the rectangular clamping block is used as a supporting point, and the position of the rectangular clamping block is fixed through the fastening screws arranged on the two sides of the upper end of the auxiliary supporting frame. An auxiliary supporting device is arranged at one side end of the main supporting frame, the end of the supporting rod is inserted into the groove, and the positioning pin in the round long groove formed in the end of the supporting rod can be inserted into the positioning groove formed in the two side walls of the groove under the action of the reset spring, so that the supporting rod plays an auxiliary supporting role. The rectangular sliding blocks in the rectangular sliding grooves formed in the two side ends of the supporting rod move backwards, and the positioning pins can be driven by the steel wire lines to come out of the positioning grooves, so that supporting points of the supporting rod can be adjusted, and the supporting rod can be detached.

The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.

Claims (10)

1. A steel structure support frame with supporting point adjustment and auxiliary support functions, comprising a main support frame (1), characterized in that the main support frame (1) is provided with an auxiliary support frame (2) and the The upper end of the auxiliary support frame (2) protrudes through the upper end of the main support frame (1), the lower end of the auxiliary support frame (2) is provided with a position fixing device (3), and the upper end of the auxiliary support frame (2) The main support frame (1) is provided with an auxiliary support device (31) at the side end, and the position fixing device (3) is formed by the outer walls on both sides of the main support frame (1). Several positioning holes (5) are evenly opened at equal distances along its height direction, circular through holes (6) and through positioning holes (5) are opened at the lower end of the auxiliary support frame (2) corresponding to the positioning holes (5) It is composed of the screw (7) of the circular through hole (6) and the fixing nuts (30) sleeved at both ends of the screw (7). A set of small fixed bearings (8) and a set of small fixed bearings (8) which are respectively provided on the two side walls along the two ends in the width direction and corresponding positions to each other, and a driving shaft (9) and a driven shaft (10) respectively provided between the small fixed bearings (8). ), the driving gear (11) and the driven gear (12) respectively sleeved on the driving shaft (9) and the driven shaft (10), and one end of the driving shaft (9) extends through the inner wall of the auxiliary support frame (2). The screw block (13) is fixedly provided at the protruding end and the upper end surface of the auxiliary support frame (2) is along its width direction and corresponding to the middle position between the driving gear (11) and the driven gear (12). The rectangular bayonet (14), the rectangular bayonet (15) extending into the middle position between the driving gear (11) and the driven gear (12) through the rectangular bayonet (14), the rectangular bayonet (15) provided on the upper end The support seat (16), the outer walls on both sides of the upper end of the auxiliary support frame (2) and corresponding to the position of the rectangular clamping block (15) are respectively provided with screw holes (17) and set screws (17) screwed into the screw holes (17). 18), the auxiliary support device (31) is formed by a groove (19) of a certain length and a groove (19) formed in the outer wall of one side of the main support frame (1) and along its height direction. Some support rods (20), the upper ends of the support rods (20) correspond to the circular long grooves (21) respectively opened in the direction of the inner walls on both sides of the groove (19), and one end is provided in the circular long groove (21) at the other end. A positioning pin (22) that can pass through the outer port of the circular long groove (21), a return spring (23), a support rod (20) provided between the bottom of the circular long groove (21) and the positioning pin (22) ) on the outer walls of both sides and close to the outer port of the long circular groove (21), a rectangular chute (24) with a certain distance along the length of the support rod (20) is opened, and the lower end is located in the rectangular chute (24) and can be The rectangular slider (25) sliding in the length direction of the rectangular chute (24), and the L-shaped circular hole connected to the inner bottom surface of the circular elongated slot (21) is opened at one end of the rectangular chute (24) near the circular elongated slot (21). (26), one end is fixedly connected with the rectangular slider (25), and the other end passes through the L-shaped round hole (26) The steel wire (27) extending into the inner cavity of the circular long groove (21) and connected to the end of the positioning pin (22), and the inner cavity of the L-shaped circular hole (26) for the transition support of the steel wire (27). The pulley block (28) and the two side walls of the groove (19) correspond to the position of the positioning pin (22) and are formed by a plurality of positioning grooves (29) that are evenly opened at equal distances along its length direction, and the support rod (20) passes through the positioning grooves (29). The pin (22) is inserted into the positioning groove (29) to achieve auxiliary support. 2. A steel structure support frame with supporting point adjustment and auxiliary support functions according to claim 1, characterized in that the two side walls of the inner cavity of the main support frame (1) correspond to each other and along its height A set of chutes are respectively opened at a certain distance in the direction, the auxiliary support frame (2) can be inserted into the inner cavity of the main support frame (1) through the chutes, and the length of the auxiliary support frame (2) is longer than that of the chutes The upper end of the auxiliary support frame (2) is located outside the main support frame (1). 3. A steel structure support frame with supporting point adjustment and auxiliary support functions according to claim 1, characterized in that the screw block (13) is configured as a hexagonal prism, which is convenient for wrench operation, and the rectangular The clamping blocks (15) correspond to the two sides of the driving gear (11) and the driven gear (12) respectively and are evenly spaced with a plurality of tooth slots along the height direction thereof. The driving gear (11) and the driven gear (12) ) outer teeth may intermesh with the tooth slots. 4. A steel structure support frame with supporting point adjustment and auxiliary support functions according to claim 1, characterized in that the length of the groove (19) is slightly larger than the length of the support rod (20), so The support rod (20) can be completely put into the groove (19) along its length direction, and when the upper end of the support rod (20) is located in the groove (19), the positioning pin (22) It can be inserted into the positioning groove (29), and the upper end of the support rod (20) and the bottom of the groove (19) contact and support each other. 5. A steel structure support frame with supporting point adjustment and auxiliary support functions according to claim 1, characterized in that the fixed end of the return spring (23) is inside the circular long groove (21). The bottom surface is fixedly arranged, the telescopic end of the return spring (23) is fixedly arranged with the inner end of the positioning pin (22), the outer end of the circular long groove (21) slightly extends inward for a certain distance, and the positioning pin (22) The inner end extends slightly outward for a certain distance, and the positioning pin (22) cannot fall off from the circular long groove (21). 6 . A steel structure support frame with supporting point adjustment and auxiliary support functions according to claim 1 , wherein a small tool box is provided on the outer wall of the main support frame ( 1 ), and the small tool box Place small maintenance equipment inside. 7. A steel structure support frame with supporting point adjustment and auxiliary support functions according to claim 1, characterized in that the support rod (20) can be a telescopic rod, and the steel wire (27) is made of a telescopic rod. Made of metal material with high tensile strength. 8. A steel structure support frame with supporting point adjustment and auxiliary support functions according to claim 1, characterized in that the main support frame (1), the auxiliary support frame (2) and the support rod (20) ) is made of steel material. 9 . The steel structure support frame with supporting point adjustment and auxiliary support functions according to claim 1 , wherein the groove ( 19 ) is located at the position of the main support frame ( 1 ). The positions of the chutes do not conflict with each other, and the thickness of the groove (19) can be set to 5-10cm. 10. A steel structure support frame with supporting point adjustment and auxiliary support functions according to claim 1, wherein the main support frame (1) and the lower end of the support rod (20) are set as Trapezoidal shape, the cross-sectional area of the support end is smaller than that of the upper end, and the cross-sectional area of the support end is placed in a ladder shape, and the cross-section of the support end is provided with several slideways at equal distances along its width.

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