CN113123610B - Construction method of large-span roof steel truss structure - Google Patents

Abstract

The invention relates to the field of building construction, and specifically discloses a construction method for a large-span roof steel truss structure, comprising the following steps: 1), installation of a jacking device; 2), jacking operation; 3), adjusting the jacking process; 5), the anti-falling measures are carried out; 6), the anti-overturning measures are carried out; 7), the jacking device is reset; Due to the lack of efficiency and stability, it is impossible to efficiently and safely complete the lifting of the super-height steel truss.

Description

A construction method of large-span roof steel truss structure

technical field

The invention relates to the technical field of building construction, and specifically discloses a construction method of a large-span roof steel truss structure.

Background technique

The steel truss itself can adapt to the distribution of bending moment and shear force inside the structure. Because the tension and compression forces in the horizontal direction achieve self-balance, the whole structure does not generate horizontal thrust on the support, so it is widely used in the field of construction. The installation of steel trusses is mostly hoisting. When installing steel trusses by hoisting, a wide and unobstructed space is required. At the same time, traction control of the steel trusses is required to ensure the lifting accuracy of the steel trusses, and can also prevent the steel truss from colliding with the wall, causing The steel truss and the wall are damaged; and the steel truss is installed by the jacking method, which does not require a wide and unobstructed space. At the same time, the installation accuracy of the jacking is higher, and there is no need for manual traction.

The jacking installation method generally uses a large-stroke hydraulic cylinder for the jacking operation, but the jacking height of the large-stroke hydraulic cylinder is smaller than the installation height of the hoisting method, and the jacking operation of the super-height roof steel truss is often incompetent.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a construction method for a large-span roof steel truss structure, so as to solve the shortcomings of the existing roof steel truss jacking construction method such as small jacking height, poor efficiency and stability, etc., and cannot efficiently and safely complete the super-height roof steel truss jacking. The problem.

In order to achieve the above object, the basic scheme of the present invention is:

A construction method for a large-span roof steel truss structure, comprising the following steps:

1) Installation of the jacking device: place the jacking device in the correct installation position, and fix the base to the ground; install the steel truss in the installation groove of the support seat, and fix the steel truss on the support seat;

2), jacking operation: energize the second electromagnet on the lower support frame, use the second electromagnet on the lower support frame to fix the lower support frame and the support column; start the hydraulic cylinder to lift the support seat and the steel truss together At the same time, the hydraulic cylinder also pushes the upper support frame to move upward; when the stroke distance of the hydraulic cylinder reaches the maximum, the second electromagnet on the upper support frame is energized, and the upper support frame is energized by the second electromagnet on the upper support frame. It is fixed with the support column, so that the output end of the hydraulic cylinder is fixed, and then the second electromagnet of the lower support frame is powered off, and the cylinder body of the hydraulic cylinder is driven to move upward through the automatic reset of the hydraulic cylinder, thereby driving the lower support frame to move upward. ; When the cylinder of the hydraulic cylinder is reset, power off the second electromagnet of the upper support frame, energize the second electromagnet of the lower support frame, fix the lower support frame again, and start the hydraulic cylinder to connect the support base and the support base again. The steel truss is jacked up; this cycle repeats until the steel truss is jacked up to the installation height, close the hydraulic cylinder, keep the second electromagnet on the upper support frame and the lower support frame continuously energized to ensure that the upper support frame, the lower support frame and the support Stable connection between columns;

3) Adjustment of the lifting process: by adjusting the reset distance of the hydraulic cylinder block, to ensure that the lifting stroke of the hydraulic cylinder reaches the maximum when the steel truss is lifted to the installation height, and the distance between the upper support frame and the lower support frame at this time When the support plate is expanded to the vertical state, the support plate pushes the connecting shaft to contact the support column, and the slot on the connecting shaft is engaged with the support column. The first electromagnet is used to fix the connecting shaft and the support column, and the upper support frame and the lower support frame are supported by the support plate, so as to prevent the upper support frame from falling, and also strengthen the connection stability with the support column;

4) Adjustment of jacking height range: if the height of the support column is not enough to reach the installation height of the steel truss, install the threaded rod of the spare support column in the threaded hole at the top of the existing support column to lengthen the support column;

5) Anti-fall measures are carried out: the upward movement of the upper support frame drives the connecting rod of the weekly measurement to move upward, and the connecting rod and the anti-overturning cylinder undergo relative displacement, thereby driving the limit block at the end of the connecting rod to slide up in the limit groove , the limit block is in contact with the arc-shaped end face of the limit pin during the sliding process, so as to squeeze and push the limit pin to slide into the chute, so that the limit block can pass the limit pin; when the limit block passes the limit pin Afterwards, the limit pin is reset under the action of the return spring, and is in contact with the bottom of the limit block, so that the limit block can only slide upward, that is, the connecting rod can only be limited to slide upward, forming a support for the upper support frame, preventing the upper support frame fall suddenly

6) Carry out anti-overturning measures: when the steel truss is raised to the installation height, rotate the anti-overturning cylinder, the limit block slides into the fixed groove from the limit groove, and the limit block is limited by the fixed groove to prevent the limit The block continues to move, thereby fixing the connecting rod, that is, forming a stable connection between the upper support frame and the base, preventing the upper support frame and the support column from overturning or loosening, causing the steel truss to overturn or shake, affecting the installation of the steel truss;

7) Reset the jacking device: after the steel truss is installed, pull out the fixed block in the slot, turn the anti-overturning cylinder in the same direction again, the limit block slides into the slot from the fixed slot, and the limit block is inserted into the slot. The groove can move up and down freely, that is, the connecting rod can move freely in the anti-overturning cylinder, thereby loosening the support to the upper support frame; close the second electromagnet on the upper support frame and the first electromagnet on the connecting shaft, and start the When the hydraulic cylinder is reset, the cylinder body of the hydraulic cylinder does not move, and the output end of the hydraulic cylinder drives the upper support frame and the support base to move down; when the hydraulic cylinder is reset, the second electromagnet on the upper support frame is activated and the lower support is closed. The second electromagnet on the frame fixes the upper support frame and loosens the lower support frame; start the hydraulic cylinder again, the output end of the hydraulic cylinder is fixed at this time, and the hydraulic cylinder pushes the cylinder body of the hydraulic cylinder and the lower support frame downward Move; when the hydraulic cylinder reaches the limit stroke, start the second electromagnet on the lower support frame again and close the second electromagnet on the upper support frame, and drive the hydraulic cylinder to reset, repeat the cycle until the upper support frame and the lower support frame Reset; after the upper support frame and the lower support frame are reset, rotate the anti-overturning cylinder in the opposite direction, so that the limit block slides into the limit groove through the bottom fixing groove, and abuts against the bottom end of the bottom limit pin to complete the reset .

Beneficial effects: When the steel truss structure is jacked up by this construction method, its jacking height is increased. Compared with the fixed jacking stroke of the existing jacking method, the jacking height of this method is higher, and it can be applied to super-height The lifting operation of the steel truss; in addition, the method has anti-overturning and anti-falling measures, so that the stability performance is stronger during the lifting process, and the construction efficiency is improved.

A self-extracting high-steel truss jacking device comprises a base, on which four rectangularly distributed support columns are fixed, the support columns are all vertically arranged, and a rectangular upper support frame and a lower support frame are slidably connected to the support columns; A hydraulic cylinder is arranged on the lower support frame, the output end of the hydraulic cylinder is flush with the top of the upper support frame, and a strut is fixed between the output end of the hydraulic cylinder and the upper support frame, and a support seat for placing the steel truss is fixed at the top of the upper support frame ; The end side walls of the opposite ends of the upper support frame and the lower support frame are hinged with support plates, and a connection shaft is hinged between the opposite support plates, and there is a height difference between adjacent connection shafts; both ends of the connection shaft are provided with A card slot engaged with the support column is provided with a first electromagnet; the lower support frame and the upper support frame are both provided with a second electromagnet fitted with the support column.

The second electromagnet on the lower support frame is used to fix the lower support frame and the support column, and the support base and the steel truss are lifted together by the hydraulic cylinder. At the same time, the hydraulic cylinder also pushes the upper support frame to move upward; when the lifting distance of the hydraulic cylinder is When the maximum is reached, the upper support frame and the support column are fixed by the second electromagnet on the upper support frame, so as to fix the output end of the hydraulic cylinder, and the second electromagnet of the lower support frame is powered off. The reset drives the cylinder body of the hydraulic cylinder to move upward, thereby driving the lower support frame to move upward; when the cylinder body of the hydraulic cylinder is reset, the second electromagnet of the upper support frame is powered off, and the second electromagnet of the lower support frame is energized, Fix the lower support frame again, and start the hydraulic cylinder to lift the support base and the steel truss again until the steel truss is lifted to the installation height.

By adjusting the reset distance of the hydraulic cylinder block, it is ensured that the lifting stroke of the hydraulic cylinder reaches the maximum when the steel truss is lifted to the installation height, and the distance between the upper support frame and the lower support frame at this time reaches the maximum, so that the two When the support plate is expanded to the vertical state, the support plate pushes the connecting shaft to contact the support column, the slot on the connecting shaft is clamped on the support column, and the first electromagnet is used to connect the connecting shaft. It is fixed with the support column, and the upper support frame and the lower support frame are supported by the support plate, and the connection stability with the support column is also strengthened.

Beneficial effects: 1. Through the cooperation between the lower support frame, the upper support frame and the hydraulic cylinder, the lower support frame and the upper support frame can move up alternately, so that the steel truss can continue to ascend along the support column, and the hydraulic cylinder The length of the jacking stroke is increased to the length of the support column. Compared with the fixed jacking stroke of the existing jacking device, the jacking height of the device is higher, and it can be applied to the jacking operation of the super-height steel truss;

2. Compared with the installation method of hoisting steel trusses, this device requires less space, reduces environmental requirements, and improves the scope of use; in addition, there is no need to manually pull the steel truss during the jacking process, ensuring the top of the steel truss. While improving the accuracy, the labor is greatly reduced.

Optionally, a connecting cylinder is circumferentially distributed around the lower support frame on the base, an end of the connecting cylinder is rotatably connected with an anti-overturning cylinder of a coaxial line, a connecting rod is axially slidably connected in the anti-overturning cylinder, and the connecting rod is connected with the upper part. The side walls corresponding to the support frame are hinged, and the end of the connecting rod is evenly fixed with limit blocks in the circumferential direction; a number of limit grooves along its axial direction are opened in the anti-overturning cylinder, and the limit blocks are slidably connected in the limit grooves, and the limit grooves A number of chutes facing the connecting rod are evenly opened in the chute, and limit pins are slidably connected in the chute, a return spring is fixed between the limit pins and the chute, and the end face of the limit pins is arc-shaped; The wall is provided with a number of arc-shaped fixing grooves, the fixing grooves are concentric with the anti-overturning cylinder, and the bottom surface of the fixing groove is parallel to the top surface of the corresponding limit pin; the anti-overturning cylinder is provided with a number of slots along the axis direction, and the slots pass through the corresponding The end of the slot is fixed, and a fixing block is arranged in the slot.

The upward movement process of the upper support frame drives the connecting rod of the peripheral measurement to move upward, and the connecting rod and the anti-overturning cylinder undergo relative displacement, thereby driving the limit block at the end of the connecting rod to slide upward in the limit groove. During the sliding process of the limit block Contact with the arc end face of the limit pin, so as to squeeze and push the limit pin to slide into the chute, so that the limit block can pass the limit pin; when the limit block passes the limit pin, the limit pin is in the return spring. It resets under the action of the switch, and abuts against the bottom of the limit block, so that the limit block can only slide upward, that is, the connecting rod can only be limited to slide upward, forming a support for the upper support frame and preventing the upper support frame from falling suddenly.

When the steel truss is lifted to the installation height, rotate the anti-overturning cylinder, the limit block slides into the fixed groove from the limit groove, and the limit block is limited by the fixed groove to prevent the limit block from continuing to move, thereby connecting the connecting rod. Fix it, that is, to form a stable connection between the upper support frame and the base, to prevent the upper support frame and the support column from overturning or loosening, causing the steel truss to overturn or shake, affecting the installation of the steel truss.

After the steel truss is installed, pull out the fixing block in the slot, turn the anti-overturning cylinder in the same direction again, and the limit block slides into the slot from the fixing slot, so that the connecting rod is released, and the connecting rod is no longer aligned. The support frame is supported, so that the upper support frame can move; when the upper support frame and the lower support frame are reset, the anti-overturning cylinder is rotated in the opposite direction, so that the limit block slides into the limit groove through the bottom fixing groove, and is connected with the most The bottom ends of the bottom limit pins touch each other to complete the reset, which is convenient for the next use.

Beneficial effect: In this solution, through the cooperation between the limit slot, the limit pin and the limit block, the connecting rod can only move upward in the upward movement process of the upper support frame, which forms a support for the upper support frame at this time. Prevent the sudden fall of the upper support frame and play an anti-fall effect; after the steel truss is raised to the required height, the anti-overturning cylinder is rotated, and the connecting rod is fixed by the cooperation between the fixing groove and the limit block, and the connecting cylinder is used. 、Anti-overturning cylinder and connecting rod form support and fix between the base and the upper support frame, and convert the lateral force on the upper support frame into a tensile force on the base while preventing falling, preventing the device from shaking or tilting It can prevent the upper support frame and the steel truss from overturning.

Optionally, there are four second electromagnets on the lower support frame and the upper support frame, the second electromagnet is annular, and the second electromagnet is coaxial with the corresponding support column, and the inner wall of the second electromagnet is A rubber layer is fixed on the upper part to be in contact with the support column.

The annular second electromagnet increases the contact area between the second electromagnet and the support column, increases the adsorption force between the second electromagnet and the support column, and improves the relationship between the lower support frame, the upper support frame and the support column. and the rubber layer increases the frictional force between the second electromagnet and the support column, preventing the second electromagnet from being adsorbed on the support column and causing relative sliding.

Optionally, a mounting plate is fixed at the bottom of the lower support frame, and the hydraulic cylinder is fixed at the center of the mounting plate.

A fixed connection is formed between the hydraulic cylinder and the lower support frame through the mounting plate.

Optionally, reinforcing ribs are fixed between the inner wall of the lower support frame and the mounting plate.

The connection between the mounting plate and the lower support frame is increased by reinforcing ribs to prevent the mounting plate from falling.

Optionally, the support base is provided with a horizontally arranged installation groove, and both ends of the installation groove penetrate through the support base.

The steel truss is placed in the installation slot and then fixed, which can effectively prevent the steel truss from breaking away from the support seat during the jacking process.

Optionally, the top end of the support column is provided with a coaxial threaded hole, and the bottom end of the support column is fixed with a threaded rod matched with the threaded hole.

The height of the support column is not enough to reach the installation height of the steel truss, then install the threaded rod of the spare support column in the threaded hole at the top of the existing support column, and lengthen the support column to increase the liftable height of the device and further improve the the height of the device to the steel truss.

Other advantages, objects, and features of the present invention will be set forth in the description that follows, and will be apparent to those skilled in the art based on a study of the following, to the extent that is taught in the practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the following description.

Description of drawings

1 is a schematic structural diagram of an embodiment of the present invention;

2 is a front view of an embodiment of the present invention;

3 is a schematic structural diagram of an upper support frame and a lower support frame in an embodiment of the present invention;

4 is a longitudinal cross-sectional view of a support column in an embodiment of the present invention;

Fig. 5 is the structural schematic diagram of the anti-overturning cylinder in the embodiment of the present invention;

Fig. 6 is the longitudinal sectional view of the anti-overturning cylinder in the embodiment of the present invention;

Fig. 7 is the enlarged schematic diagram of A place in Fig. 6;

FIG. 8 is a schematic structural diagram of a connecting rod in an embodiment of the present invention.

Detailed ways

The following is further described in detail by specific embodiments:

The reference signs in the drawings include: base 1, support column 2, lower support frame 3, upper support frame 4, hydraulic cylinder 5, support rod 6, support seat 7, support plate 8, connecting shaft 9, card slot 10 , the first electromagnet 11, the second electromagnet 12, the connecting cylinder 13, the anti-overturning cylinder 14, the connecting rod 15, the limit block 16, the limit groove 17, the chute 18, the limit pin 19, the return spring 20, the fixed Slot 21 , slot 22 , fixing block 23 , installation slot 24 , installation plate 25 , reinforcing rib 26 , threaded hole 27 , threaded rod 28 , and steel truss 29 .

Example

As shown in Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, Figure 5, Figure 7 and Figure 8:

A construction method for a large-span roof steel truss structure, comprising the following steps:

1) Installation of the jacking device: place the jacking device in the correct installation position, and fix the base 1 on the ground; install the steel truss 29 in the installation groove 24 of the support seat 7, and fix the steel truss 29 on the support seat 7 superior;

2), jacking operation: energize the second electromagnet 12 on the lower support frame 3, and use the second electromagnet 12 on the lower support frame 3 to fix the lower support frame 3 and the support column 2; The support base 7 is lifted together with the steel truss 29, and the hydraulic cylinder 5 also pushes the upper support frame 4 to move upward; when the stroke distance of the hydraulic cylinder 5 reaches the maximum, the second electromagnet 12 on the upper support frame 4 is energized, The upper support frame 4 and the support column 2 are fixed by the second electromagnet 12 on the upper support frame 4, so as to fix the output end of the hydraulic cylinder 5, and then the second electromagnet 12 of the lower support frame 3 is powered off. The automatic reset of the hydraulic cylinder 5 drives the cylinder body of the hydraulic cylinder 5 to move upward, thereby driving the lower support frame 3 to move upward; when the cylinder body of the hydraulic cylinder 5 is reset, the second electromagnet 12 of the upper support frame 4 is powered off, and the The second electromagnet 12 of the lower support frame 3 is energized, the lower support frame 3 is fixed again, and at the same time, the hydraulic cylinder 5 is started to lift the support base 7 and the steel truss 29 again; this cycle repeats until the steel truss 29 is lifted to the installation height, close the hydraulic cylinder 5, keep the second electromagnet 12 on the upper support frame 4 and the lower support frame 3 continuously energized, and ensure the stable connection between the upper support frame 4, the lower support frame 3 and the support column 2;

3) Adjustment of the lifting process: By adjusting the reset distance of the hydraulic cylinder 5, it is ensured that the lifting stroke of the hydraulic cylinder 5 reaches the maximum when the steel truss 29 is lifted to the installation height. At this time, the upper support frame 4 and the lower support frame are The distance between 3 reaches the maximum, so that the support plate 8 between the two is expanded to a vertical state. When the support plate 8 is expanded to a vertical state, the support plate 8 pushes the connection shaft 9 to contact the support column 2, and the connection shaft 9 The upper card slot 10 is clamped on the support column 2, the first electromagnet 11 is used to fix the connecting shaft 9 and the support column 2, and the upper support frame 4 and the lower support frame 3 are supported by the support plate 8 to prevent the upper support frame 4 and the lower support frame 3. The support frame 4 falls, and the connection stability with the support column 2 is also strengthened;

4), jacking height range adjustment: jacking height range adjustment: if the height of the support column 2 is not enough to reach the installation height of the steel truss 29, then install the threaded rod 28 of the spare support column 2 on the top of the existing support column 2 In the threaded hole 27, the support column 2 is lengthened;

5), anti-fall measures are carried out: the upward movement of the upper support frame 4 drives the connecting rod 15 of the weekly measurement to move upward, and the connecting rod 15 and the anti-overturning cylinder 14 are relatively displaced, thereby driving the limit block 16 at the end of the connecting rod 15 to move upward. The limit slot 17 slides upward, and the limit block 16 contacts the arc-shaped end face of the limit pin 19 during the sliding process, thereby squeezing and pushing the limit pin 19 to slide into the chute 18, so that the limit block 16 can pass through Limiting pin 19; when the limiting block 16 passes the limiting pin 19, the limiting pin 19 is reset under the action of the return spring 20, and abuts against the bottom of the limiting block 16, so that the limiting block 16 can only slide upwards, that is Restricting the connecting rod 15 to only slide upwards to form support for the upper support frame 4 to prevent the upper support frame 4 from falling suddenly;

6) Carry out anti-overturning measures: when the steel truss 29 is lifted to the installation height, the anti-overturning cylinder 14 is rotated, the limit block 16 is slid into the fixed groove 21 from the limit groove 17, and the limit block is moved by the fixed groove 21. 16 to limit to prevent the limit block 16 from continuing to move, thereby fixing the connecting rod 15, that is, to form a stable connection between the upper support frame 4 and the base 1, to prevent the upper support frame 4 and the support column 2 from overturning or loosening, causing steel Overturning or shaking of the truss 29 affects the installation of the steel truss 29;

7) Reset the jacking device: after the steel truss is installed, pull out the fixed block in the slot, turn the anti-overturning cylinder in the same direction again, the limit block slides into the slot from the fixed slot, and the limit block is inserted into the slot. The groove can move up and down freely, that is, the connecting rod can move freely in the anti-overturning cylinder, thereby loosening the support to the upper support frame; close the second electromagnet on the upper support frame and the first electromagnet on the connecting shaft, and start the When the hydraulic cylinder is reset, the cylinder body of the hydraulic cylinder does not move, and the output end of the hydraulic cylinder drives the upper support frame and the support base to move down; when the hydraulic cylinder is reset, the second electromagnet on the upper support frame is activated and the lower support is closed. The second electromagnet on the frame fixes the upper support frame and loosens the lower support frame; start the hydraulic cylinder again, the output end of the hydraulic cylinder is fixed at this time, and the hydraulic cylinder pushes the cylinder body of the hydraulic cylinder and the lower support frame downward Move; when the hydraulic cylinder reaches the limit stroke, start the second electromagnet on the lower support frame again and close the second electromagnet on the upper support frame, and drive the hydraulic cylinder to reset, repeat the cycle until the upper support frame and the lower support frame Reset; after the upper support frame and the lower support frame are reset, rotate the anti-overturning cylinder in the opposite direction, so that the limit block slides into the limit groove through the bottom fixing groove, and abuts against the bottom end of the bottom limit pin to complete the reset .

When the steel truss structure is jacked up by this construction method, the jacking height is increased. Compared with the fixed jacking stroke of the existing jacking method, the jacking height of this method is higher, and it can be applied to the super-height steel truss. Lifting operation; in addition, the method has anti-overturning and anti-falling measures, the stability is stronger during the lifting process, and the construction efficiency is improved.

A self-extracting high-steel truss jacking device involved in a construction method for a large-span roof steel truss structure includes a base 1, on which four rectangularly distributed support columns 2 are fixed, and the support columns 2 are all vertically arranged. The support column 2 is slidably connected with a rectangular upper support frame 4 and a lower support frame 3; the lower support frame 3 is provided with a hydraulic cylinder 5, the output end of the hydraulic cylinder 5 is flush with the top of the upper support frame 4, and the output of the hydraulic cylinder 5 A strut 6 is fixed between the end and the upper support frame 4, and a support seat 7 for placing the steel truss 29 is fixed at the top of the upper support frame 4; Plate 8, a connecting shaft 9 is hinged between the opposite support plates 8, and there is a height difference between adjacent connecting shafts 9; A first electromagnet 11 is arranged in the slot 10 ; a second electromagnet 12 is arranged on both the lower support frame 3 and the upper support frame 4 and is fitted with the support column 2 .

The second electromagnet 12 on the lower support frame 3 is energized, and the second electromagnet 12 on the lower support frame 3 is used to fix the lower support frame 3 and the support column 2; the hydraulic cylinder 5 is activated to connect the support base 7 and the steel truss 29 At the same time, the hydraulic cylinder 5 also pushes the upper support frame 4 to move upward; when the stroke distance of the hydraulic cylinder 5 reaches the maximum, the second electromagnet 12 on the upper support frame 4 is energized, and the The second electromagnet 12 fixes the upper support frame 4 and the support column 2, thereby fixing the output end of the hydraulic cylinder 5, and then the second electromagnet 12 of the lower support frame 3 is powered off, and is driven by the automatic reset of the hydraulic cylinder 5. The cylinder body of the hydraulic cylinder 5 moves upward, thereby driving the lower support frame 3 to move upward; when the cylinder body of the hydraulic cylinder 5 is reset, the second electromagnet 12 of the upper support frame 4 is powered off, and the second electromagnet 12 of the lower support frame 3 is powered off. The electromagnet 12 is energized, the lower support frame 3 is fixed again, and the hydraulic cylinder 5 is activated to lift the support base 7 and the steel truss 29 again; this cycle repeats until the steel truss 29 is lifted to the installation height, and the hydraulic cylinder 5 is closed. Keep the second electromagnets 12 on the upper support frame 4 and the lower support frame 3 continuously energized to ensure stable connection between the upper support frame 4 , the lower support frame 3 and the support column 2 .

By adjusting the reset distance of the cylinder body of the hydraulic cylinder 5, it is ensured that the lifting stroke of the hydraulic cylinder 5 reaches the maximum when the steel truss 29 is lifted to the installation height, and the distance between the upper support frame 4 and the lower support frame 3 at this time reaches the maximum, Thereby, the support plate 8 between the two is unfolded to the vertical state. When the support plate 8 is unfolded to the vertical state, the support plate 8 pushes the connecting shaft 9 to contact the support column 2, and the card slot 10 on the connecting shaft 9 is engaged in the vertical state. On the support column 2, the connecting shaft 9 and the support column 2 are fixed by the first electromagnet 11, and the upper support frame 4 and the lower support frame 3 are supported by the support plate 8, and the connection with the support column 2 is also strengthened. stability.

1. In this scheme, through the cooperation between the lower support frame 3, the upper support frame 4 and the hydraulic cylinder 5, the lower support frame 3 and the upper support frame 4 can be moved up alternately, so that the steel truss 29 can move up along the support column 2. Continue upward, and increase the length of the jacking stroke of the hydraulic cylinder 5 to the length of the support column 2. Compared with the fixed jacking stroke of the existing jacking device, the jacking height of this device is higher, and it can be applied to ultra-high steel The lifting operation of the truss 29;

2. Compared with the installation method of hoisting the steel truss 29, the space required by the device is smaller, which reduces the environmental requirements and increases the scope of use; in addition, there is no need to manually pull the steel truss 29 during the lifting process. The lifting accuracy of 29 greatly reduces labor.

Optionally, a connecting cylinder 13 is circumferentially distributed around the lower support frame 3 on the base 1 , the end of the connecting cylinder 13 is rotatably connected with a coaxial anti-overturning cylinder 14 , and the anti-overturning cylinder 14 is axially slidably connected with a connection. The rod 15, the connecting rod 15 is hinged with the side wall corresponding to the upper support frame 4, and the limit block 16 is evenly fixed in the circumferential direction at the end of the connecting rod 15; The position block 16 is slidably connected in the limit groove 17 . The limit groove 17 is evenly provided with a number of sliding grooves 18 facing the connecting rod 15 . The sliding grooves 18 are all slidably connected to the limiting pins 19 , and the limiting pins 19 and the sliding grooves 18 are slidably connected. A reset spring 20 is fixed between them, and the end face of the limit pin 19 is arc-shaped; the side wall of the chute 18 is provided with a number of arc-shaped fixing grooves 21. The bottom surface of 21 is parallel to the top surface of the corresponding limit pin 19; the anti-overturning cylinder 14 is provided with a plurality of slots 22 along the axis direction, the slots 22 penetrate the end of the corresponding fixing slot 21, and the slot 22 is provided with a fixing block 23 .

The upward movement process of the upper support frame 4 drives the connecting rod 15 of the peripheral measurement to move upward, and the connecting rod 15 and the anti-overturning cylinder 14 are relatively displaced, thereby driving the limit block 16 at the end of the connecting rod 15 to slide upward in the limit groove 17, The limit block 16 is in contact with the arc-shaped end surface of the limit pin 19 during the sliding process, so as to squeeze and push the limit pin 19 to slide into the chute 18, so that the limit block 16 can pass the limit pin 19; After the block 16 passes the limit pin 19, the limit pin 19 is reset under the action of the return spring 20, and abuts against the bottom of the limit block 16, so that the limit block 16 can only slide upward, that is, the connecting rod 15 can only be limited to slide upward. , to form support for the upper support frame 4 to prevent the upper support frame 4 from falling suddenly.

When the steel truss 29 is lifted to the installation height, the anti-overturning cylinder 14 is rotated, and the limit block 16 is slid into the fixed groove 21 from the limit groove 17, and the limit block 16 is limited by the fixed groove 21 to prevent the limit block. 16 continues to move, thereby fixing the connecting rod 15, that is, forming a stable connection between the upper support frame 4 and the base 1, preventing the upper support frame 4 and the support column 2 from overturning or loosening, causing the steel truss 29 to overturn or shake, affecting the steel truss 29. Installation of truss 29.

After the steel truss 29 is installed, the fixing block 23 in the slot 22 is pulled out, and the anti-overturning cylinder 14 is rotated in the same direction again. open, the connecting rod 15 no longer supports the upper support frame 4, so that the upper support frame 4 can move; when the upper support frame 4 and the lower support frame 3 are reset, the anti-overturning cylinder 14 is rotated in the opposite direction, so that the limit block 16 is The bottommost fixing slot 21 slides into the limiting slot 17 and abuts against the bottom end of the bottommost limiting pin 19 to complete the reset and facilitate the next use.

In this solution, through the cooperation between the limit slot 17 , the limit pin 19 and the limit block 16 , the connecting rod 15 can only move upward during the upward movement of the upper support frame 4 . Form a support to prevent the upper support frame 4 from falling suddenly, and play an anti-fall effect; and after the steel truss 29 is lifted to the required height, the anti-overturning cylinder 14 is rotated, and the matching between the fixing groove 21 and the limit block 16 is used. The connecting rod 15 is fixed, and the connecting cylinder 13, the anti-overturning cylinder 14, and the connecting rod 15 are used to form support and fixation between the base 1 and the upper support frame 4. The force is converted into a tensile force on the base 1 to prevent the device from shaking or overturning, so as to prevent the upper support frame 4 and the steel truss 29 from overturning.

Optionally, there are four second electromagnets 12 on the lower support frame 3 and the upper support frame 4, the second electromagnets 12 are annular, and the second electromagnets 12 are coaxial with the corresponding support columns 2. , a rubber layer is fixed on the inner wall of the second electromagnet 12 in contact with the support column 2 .

The annular second electromagnet 12 increases the contact area between the second electromagnet 12 and the support column 2, increases the adsorption force between the second electromagnet 12 and the support column 2, improves the lower support frame 3, the upper The connection stability between the support frame 4 and the support column 2; and the rubber layer increases the friction between the second electromagnet 12 and the support column 2, preventing the second electromagnet 12 from being adsorbed on the support column 2. relative sliding.

Optionally, a mounting plate 25 is fixed at the bottom of the lower support frame 3 , and the hydraulic cylinder 5 is fixed at the center of the mounting plate 25 .

The hydraulic cylinder 5 forms a fixed connection with the lower support frame 3 through the mounting plate 25 .

Optionally, reinforcing ribs 26 are fixed between the inner wall of the lower support frame 3 and the mounting plate 25 .

The connection between the mounting plate 25 and the lower support frame 3 is increased by the reinforcing ribs 26 to prevent the mounting plate 25 from falling.

Optionally, the support base 7 is provided with a horizontally arranged installation groove 24 , and both ends of the installation groove 24 penetrate through the support base 7 .

The steel truss 29 is placed in the installation groove 24 and then fixed, which can effectively prevent the steel truss 29 from detaching from the support base 7 during the lifting process.

Optionally, the top end of the support column 2 is provided with a coaxial threaded hole 27 , and the bottom end of the support column 2 is fixed with a threaded rod 28 matched with the threaded hole 27 .

The height of the support column 2 is not enough to reach the installation height of the steel truss 29, then the threaded rod 28 of the spare support column 2 is installed in the threaded hole 27 at the top of the existing support column 2, and the support column 2 is lengthened to increase the device The lifting height of the device further increases the lifting height of the steel truss 29 by the device.

The above descriptions are only embodiments of the present invention, and common knowledge such as well-known specific structures and characteristics in the solution are not described too much here. It should be pointed out that for those skilled in the art, some modifications and improvements can be made without departing from the structure of the present invention. These should also be regarded as the protection scope of the present invention, and these will not affect the implementation of the present invention. Effects and applicability of the present invention.

Claims (8)

1. a large-span roof steel truss structure construction method, is characterized in that: comprise the following steps: 1) Installation of the jacking device: place the jacking device in the correct installation position, and fix the base to the ground; install the steel truss in the installation groove of the support seat, and fix the steel truss on the support seat; 2), jacking operation: energize the second electromagnet on the lower support frame, use the second electromagnet on the lower support frame to fix the lower support frame and the support column; start the hydraulic cylinder to lift the support seat and the steel truss together At the same time, the hydraulic cylinder also pushes the upper support frame to move upward; when the stroke distance of the hydraulic cylinder reaches the maximum, the second electromagnet on the upper support frame is energized, and the upper support frame is energized by the second electromagnet on the upper support frame. It is fixed with the support column, so that the output end of the hydraulic cylinder is fixed, and then the second electromagnet of the lower support frame is powered off, and the cylinder body of the hydraulic cylinder is driven to move upward through the automatic reset of the hydraulic cylinder, thereby driving the lower support frame to move upward. ; When the cylinder of the hydraulic cylinder is reset, power off the second electromagnet of the upper support frame, energize the second electromagnet of the lower support frame, fix the lower support frame again, and start the hydraulic cylinder to connect the support base and the support base again. The steel truss is jacked up; this cycle repeats until the steel truss is jacked up to the installation height, close the hydraulic cylinder, keep the second electromagnet on the upper support frame and the lower support frame continuously energized to ensure that the upper support frame, the lower support frame and the support Stable connection between columns; 3) Adjustment of the lifting process: by adjusting the reset distance of the hydraulic cylinder block, to ensure that the lifting stroke of the hydraulic cylinder reaches the maximum when the steel truss is lifted to the installation height, and the distance between the upper support frame and the lower support frame at this time When the support plate is expanded to the vertical state, the support plate pushes the connecting shaft to contact the support column, and the slot on the connecting shaft is engaged with the support column. The first electromagnet is used to fix the connecting shaft and the support column, and the upper support frame and the lower support frame are supported by the support plate, so as to prevent the upper support frame from falling, and also strengthen the connection stability with the support column; 4) Adjustment of jacking height range: if the height of the support column is not enough to reach the installation height of the steel truss, install the threaded rod of the spare support column in the threaded hole at the top of the existing support column to lengthen the support column; 5) Anti-fall measures are carried out: the upward movement of the upper support frame drives the connecting rod of the weekly measurement to move upward, and the connecting rod and the anti-overturning cylinder undergo relative displacement, thereby driving the limit block at the end of the connecting rod to slide up in the limit groove , the limit block is in contact with the arc-shaped end face of the limit pin during the sliding process, so as to squeeze and push the limit pin to slide into the chute, so that the limit block can pass the limit pin; when the limit block passes the limit pin Afterwards, the limit pin is reset under the action of the return spring, and is in contact with the bottom of the limit block, so that the limit block can only slide upward, that is, the connecting rod can only be limited to slide upward, forming a support for the upper support frame, preventing the upper support frame fall suddenly 6) Carry out anti-overturning measures: when the steel truss is raised to the installation height, rotate the anti-overturning cylinder, the limit block slides into the fixed groove from the limit groove, and the limit block is limited by the fixed groove to prevent the limit The block continues to move, thereby fixing the connecting rod, that is, forming a stable connection between the upper support frame and the base, preventing the upper support frame and the support column from overturning or loosening, causing the steel truss to overturn or shake, affecting the installation of the steel truss; 7) Reset the jacking device: after the steel truss is installed, pull out the fixed block in the slot, turn the anti-overturning cylinder in the same direction again, the limit block slides into the slot from the fixed slot, and the limit block is inserted into the slot. The groove can move up and down freely, that is, the connecting rod can move freely in the anti-overturning cylinder, thereby loosening the support to the upper support frame; close the second electromagnet on the upper support frame and the first electromagnet on the connecting shaft, and start the When the hydraulic cylinder is reset, the cylinder body of the hydraulic cylinder does not move, and the output end of the hydraulic cylinder drives the upper support frame and the support base to move down; when the hydraulic cylinder is reset, the second electromagnet on the upper support frame is activated and the lower support is closed. The second electromagnet on the frame fixes the upper support frame and loosens the lower support frame; start the hydraulic cylinder again, the output end of the hydraulic cylinder is fixed at this time, and the hydraulic cylinder pushes the cylinder body of the hydraulic cylinder and the lower support frame downward Move; when the hydraulic cylinder reaches the limit stroke, start the second electromagnet on the lower support frame again and close the second electromagnet on the upper support frame, and drive the hydraulic cylinder to reset, repeat the cycle until the upper support frame and the lower support frame Reset; after the upper support frame and the lower support frame are reset, rotate the anti-overturning cylinder in the opposite direction, so that the limit block slides into the limit groove through the bottom fixing groove, and abuts against the bottom end of the bottom limit pin to complete the reset . 2. A self-extracting high-steel truss jacking device involved in a construction method for a large-span roof steel truss structure according to claim 1, characterized in that it comprises a base on which four rectangularly distributed supports are fixed. The column and the support column are arranged vertically, and the support column is slidably connected with a rectangular upper support frame and a lower support frame; the lower support frame is provided with a hydraulic cylinder, the output end of the hydraulic cylinder is flush with the top of the upper support frame, and the hydraulic cylinder A support rod is fixed between the output end and the upper support frame, and the top of the upper support frame is fixed with a support seat for placing the steel truss; the end side walls of the opposite ends of the upper support frame and the lower support frame are hinged with support plates, and the opposite support plates are connected to each other. A connecting shaft is hinged between the two connecting shafts, and there is a height difference between the adjacent connecting shafts; both ends of the connecting shaft are provided with a slot for engaging with the support column, and a first electromagnet is arranged in the slot; the lower support Both the frame and the upper support frame are provided with a second electromagnet that is fitted with the support column. 3. A self-extracting high-steel truss jacking device according to claim 2, characterized in that: a connecting cylinder is circumferentially distributed around the lower support frame on the base, and the end of the connecting cylinder is rotatably connected with a coaxial anti-corrosion The overturning cylinder is axially slidably connected with a connecting rod, the connecting rod is hinged with the side wall corresponding to the upper support frame, and the end of the connecting rod is evenly fixed with a limit block in the circumferential direction; The limit groove is slidably connected to the limit block, and a number of chutes facing the connecting rod are evenly opened in the limit groove. A return spring is fixed, and the end face of the limit pin is arc-shaped; the side wall of the chute is provided with a number of arc-shaped fixing grooves, the fixing groove and the anti-overturning cylinder are concentric, and the bottom surface of the fixing groove is parallel to the top surface of the corresponding limit pin The anti-overturning cylinder is provided with a plurality of slots along the axis direction, the slots run through the end of the corresponding fixing slot, and a fixing block is arranged in the slot. 4 . The self-extracting high-steel truss jacking device according to claim 3 , wherein the second electromagnets on the lower support frame and the upper support frame are four, and the second electromagnets are annular, 5 . The second electromagnet is coaxial with the corresponding support column, and a rubber layer is fixed on the inner wall of the second electromagnet to contact the support column. 5 . The self-extracting high-steel truss jacking device according to claim 4 , wherein a mounting plate is fixed at the bottom of the lower support frame, and the hydraulic cylinder is fixed at the center of the mounting plate. 6 . 6 . The self-extracting high-steel truss jacking device according to claim 5 , wherein reinforcing ribs are fixed between the inner wall of the lower support frame and the mounting plate. 7 . 7 . The self-extracting high-steel truss jacking device according to claim 6 , wherein the support base is provided with a horizontally arranged installation groove, and both ends of the installation groove penetrate through the support base. 8 . 8 . The self-extracting high-steel truss jacking device according to claim 7 , wherein the top end of the support column is provided with a coaxial threaded hole, and the bottom end of the support column is fixed with a threaded hole matching with the threaded hole. 9 . Threaded rod.

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