Steel truss lifting device and method of use

Abstract

The application discloses a steel truss lifting device and a use method, and belongs to the technical field of steel truss lifting, and comprises a supporting cylinder, a hydraulic jack, an upper anchorage device, a lower anchorage device, a steel strand, a multi-way hydraulic valve and a hydraulic pump, the bottom wall of a jacking cylinder is sealingly and slidably connected in a ring-shaped hydraulic cylinder, and the bottom wall of the jacking cylinder and the ring-shaped hydraulic cylinder form a first hydraulic space; the lower anchorage device is located above a through hole; the ring-shaped hydraulic cylinder is arranged at the top end of the supporting cylinder, and the upper anchorage device is installed at the top end of the jacking cylinder; the steel strand is fixedly connected with a steel truss; the upper anchorage device and the lower anchorage device can clamp the steel strand; the first hydraulic space, the upper anchorage device and the lower anchorage device are in communication with a pipeline of the multi-way hydraulic valve, and the multi-way hydraulic valve is connected with the hydraulic pump. The application continuously lifts the steel truss through the continuous cylinder unloading of the hydraulic jack, the upper anchorage device and the lower anchorage device, and the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of steel truss lifting, and particularly relates to a steel truss lifting device and a use method. BACKGROUND

[0002] The lifting method of the steel truss mainly includes high-altitude assembly method, integral installation method, high-altitude sliding method and jack lifting method. Among them, the jack lifting method is a common construction method, and its basic principle is to use a hydraulic jack to lift the steel truss step by step. After each stroke is completed, the steel truss needs to be fixed through a temporary support structure, and then the jack is retracted to reset, and the next round of lifting operation is performed. Due to the limited stroke of the jack, the lifting height is small each time, and the cycle operation of lifting-supporting-resetting needs to be performed frequently, resulting in low construction efficiency, especially in the construction of large-span steel trusses, which takes longer. And each time after lifting, the support structure needs to be adjusted or replaced manually, which not only increases the labor intensity, but also easily causes safety hazards due to improper operation. It is urgent for technical personnel in the field to provide a steel truss lifting device which can realize continuous lifting of the steel truss by using the continuous cylinder reversal of the jack to improve work efficiency. SUMMARY

[0003] Therefore, the present application provides a steel truss lifting device and a use method to solve the above problems.

[0004] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0005] A steel truss lifting device, comprising: a support cylinder, a hydraulic jack, an upper anchor device, a lower anchor device, a steel strand, a multi-way hydraulic valve and a hydraulic pump, the hydraulic jack comprising a ring-shaped hydraulic cylinder and a lifting cylinder, the bottom wall of the lifting cylinder being sealingly and slidably connected in the ring-shaped hydraulic cylinder, the bottom wall of the lifting cylinder and the ring-shaped hydraulic cylinder forming a first hydraulic space; a through hole is provided in the center of the bottom wall of the support cylinder, and the lower anchor device is fixedly arranged on the bottom wall of the support cylinder and located above the through hole; the ring-shaped hydraulic cylinder is fixedly arranged at the top end of the support cylinder, and the upper anchor device is fixedly installed at the top end of the lifting cylinder; the steel strand is fixedly connected with the steel truss through the upper anchor device, the hydraulic jack, the lower anchor device and the through hole, and the upper anchor device and the lower anchor device can clamp the steel strand; the first hydraulic space, the upper anchor device and the lower anchor device are in pipeline communication with the multi-way hydraulic valve, and the multi-way hydraulic valve is in pipeline communication with the hydraulic pump.

[0006] Further, the bottom wall of the ring-shaped hydraulic cylinder is provided with a first hydraulic passage, one end of the first hydraulic passage being in communication with the first hydraulic space, and the other end being in pipeline communication with the multi-way hydraulic valve.

[0007] Further, the lower anchorage device comprises a lower support column, a lower circular shell and a lower wedge-shaped clamp, a first disc is arranged on the sidewall of the lower support column, a first flange is arranged at the bottom end of the lower circular shell, the first disc is in sealing sliding connection with the inner wall of the lower circular shell, and the first flange is in sealing sliding connection with the sidewall of the lower support column; the first flange, the sidewall of the lower support column, the first disc and the inner wall of the lower circular shell form a second hydraulic space; the bottom wall of the annular hydraulic cylinder is provided with a second hydraulic passage; the first flange is provided with a third hydraulic passage, and the third hydraulic passage is in communication with the second hydraulic space; the third hydraulic passage, the second hydraulic passage and the multi-way hydraulic valve are in pipeline communication; a pair of the lower wedge-shaped clamps are installed on the inner top wall of the lower circular shell, the lower support column is provided with a lower wedge-shaped groove, and the lower wedge-shaped clamp is matched with the lower wedge-shaped groove; the steel strand is fixedly connected with the steel truss by penetrating through the lower circular shell, the pair of lower wedge-shaped clamps and the lower wedge-shaped groove, and the lower wedge-shaped clamp matched with the lower wedge-shaped groove can clamp the steel strand.

[0008] Further, the upper anchorage device comprises an upper support column, an upper circular shell and an upper wedge-shaped clamp, a second disc is arranged on the sidewall of the upper support column, a second flange is arranged at the bottom end of the upper circular shell, the second disc is in sealing sliding connection with the inner wall of the upper circular shell, and the second flange is in sealing sliding connection with the sidewall of the upper support column; the second flange, the sidewall of the upper support column, the second disc and the inner wall of the upper circular shell form a third hydraulic space; the second flange is provided with a fourth hydraulic passage, and the fourth hydraulic passage is in communication with the third hydraulic space; the fourth hydraulic passage and the multi-way hydraulic valve are in pipeline communication; a pair of the upper wedge-shaped clamps are installed on the inner top wall of the upper circular shell, the upper support column is provided with an upper wedge-shaped groove, and the upper wedge-shaped clamp is matched with the upper wedge-shaped groove; the steel strand is fixedly connected with the steel truss by penetrating through the upper circular shell, the pair of upper wedge-shaped clamps and the upper wedge-shaped groove, and the upper wedge-shaped clamp matched with the upper wedge-shaped groove can clamp the steel strand.

[0009] Further, the steel strand is provided in plurality, and the number of the upper wedge-shaped clamps and the lower wedge-shaped clamps, and the number of the upper wedge-shaped grooves and the lower wedge-shaped grooves are the same as that of the steel strand.

[0010] A method for using a steel truss lifting device, comprising the following steps:

[0011] S1. Fixing the steel truss lifting device on the support platform, and the steel strand is in communication with the steel truss by penetrating through the upper anchorage device, the jack, the lower anchorage device and the support cylinder;

[0012] S2. The hydraulic pump supplies oil to the third hydraulic space through the multi-way hydraulic valve, the upper circular shell moves downward relative to the upper support column, and the upper wedge-shaped clamp moves into the upper wedge-shaped groove to clamp the steel strand; the hydraulic pump pumps oil out of the second hydraulic space through the multi-way hydraulic valve, the lower circular shell moves upward relative to the lower support column, the pressure in the second hydraulic space is kept constant, and the lower wedge-shaped clamp moves upward from the lower wedge-shaped groove to release the steel strand;

[0013] S3. The hydraulic pump supplies oil to the first hydraulic space through the multi-way hydraulic valve, the jacking cylinder moves upward relative to the annular hydraulic cylinder, the jacking cylinder jacks up the upper support column, and the steel truss is lifted through the clamping of the upper wedge-shaped clamp on the steel strand;

[0014] S4. The hydraulic pump supplies oil to the second hydraulic space through the multi-way hydraulic valve, the lower circular shell moves downward relative to the lower support column, and the lower wedge-shaped clamp moves into the lower wedge-shaped groove to clamp the steel strand;

[0015] S5. The hydraulic pump pumps oil out of the third hydraulic space through the multi-way hydraulic valve, the upper circular shell moves upward relative to the upper support column, the pressure in the third hydraulic space is kept constant, and the upper wedge-shaped clamp moves upward from the upper wedge-shaped groove to release the steel strand;

[0016] S6. The hydraulic pump pumps oil out of the first hydraulic space through the multi-way hydraulic valve, the jacking cylinder moves downward relative to the annular hydraulic cylinder, and the jacking cylinder moves downward along the steel strand with the upper anchor device until the bottom wall of the jacking cylinder is in close contact with the bottom wall of the annular hydraulic cylinder;

[0017] S7. Repeat S2-S6 to continuously lift the steel truss through the continuous cylinder reversal of the hydraulic jack, the upper anchor device and the lower anchor device.

[0018] The beneficial effects of the present application are:

[0019] The present application controls the oil supply and pumping of the first hydraulic space in the hydraulic jack, the second hydraulic space in the lower anchor device, and the third hydraulic space in the upper anchor device through the multi-way hydraulic valve, realizes the continuous cylinder reversal of the hydraulic jack, the upper anchor device and the lower anchor device, and continuously lifts the steel truss through the continuous cylinder reversal of the hydraulic jack, the upper anchor device and the lower anchor device, thereby improving the work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to explain the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative work on the basis of the provided drawings.

[0021] Figure 1 It is a structural schematic diagram of a steel truss lifting device.

[0022] Figure 2 It is a use state of a steel truss lifting device Figure One .

[0023] Figure 3 It is a use state of a steel truss lifting device Figure Two .

[0024] Figure 4 It is a use state of a steel truss lifting device Figure Three .

[0025] Figure 5 It is a use state of a steel truss lifting device Figure Four .

[0026] Figure 6 It is a use state of a steel truss lifting device Figure Five .

[0027] In the figure, the following:

[0028] 10-supporting cylinder, 11-via hole, 20-hydraulic jack, 21-ring-shaped hydraulic cylinder, 211-first hydraulic passage, 212-second hydraulic passage, 22-jacking cylinder, 30-upper anchorage device, 31-upper supporting column, 311-second disc, 312-upper wedge-shaped groove, 32-upper circular shell, 321-second flange, 3211-fourth hydraulic passage, 33-upper wedge-shaped clamping piece, 40-lower anchorage device, 41-lower supporting column, 411-first disc, 412-lower wedge-shaped groove, 42-lower circular shell, 421-first flange, 4211-third hydraulic passage, 43-lower wedge-shaped clamping piece, 50-steel strand, 60-multi-way hydraulic valve, 70-hydraulic pump, 80-first hydraulic space, 90-second hydraulic space, 100-third hydraulic space, 110-steel truss. DETAILED DESCRIPTION

[0029] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0030] Embodiment 1

[0031] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application. Figures 1-6 The present application provides a steel truss lifting device, comprising: a support cylinder 10, a hydraulic jack 20, an upper anchor device 30, a lower anchor device 40, a steel strand 50, a multi-way hydraulic valve 60 and a hydraulic pump 70, the hydraulic jack 20 comprises an annular hydraulic cylinder 21 and a jacking cylinder 22, the bottom wall of the jacking cylinder 22 is sealingly and slidably connected in the annular hydraulic cylinder 21, and the bottom wall of the jacking cylinder 22 and the annular hydraulic cylinder 21 form a first hydraulic space 80; a through hole 11 is arranged in the center of the bottom wall of the support cylinder 10, the lower anchor device 40 is fixedly arranged on the bottom wall of the support cylinder 10 and located above the through hole 11; the annular hydraulic cylinder 21 is fixedly arranged at the top end of the support cylinder 10, and the upper anchor device 30 is fixedly installed at the top end of the jacking cylinder 22; the steel strand 50 is fixedly connected with a steel truss 110 by passing through the upper anchor device 30, the hydraulic jack 20, the lower anchor device 40 and the through hole 11, and the upper anchor device 30 and the lower anchor device 40 can clamp the steel strand 50; the first hydraulic space 80, the upper anchor device 30 and the lower anchor device 40 are in pipeline communication with the multi-way hydraulic valve 60, and the multi-way hydraulic valve 60 is in pipeline communication with the hydraulic pump 70, specifically, the hydraulic pump 70 controls the hydraulic jack 20, the upper anchor device 30 and the lower anchor device 40 through the multi-way hydraulic valve 60, like a single pump of a excavator simultaneously controlling an arm cylinder, a stick cylinder and a bucket cylinder through a multi-way valve.

[0032] The bottom wall of the annular hydraulic cylinder 21 is provided with a first hydraulic passage 211, one end of the first hydraulic passage 211 is in communication with the first hydraulic space 80, and the other end is in pipeline communication with the multi-way hydraulic valve 60.

[0033] The lower anchorage device 40 comprises a lower support column 41, a lower circular housing 42 and a lower wedge-shaped clamp 43, a first disc 411 is arranged on the side wall of the lower support column 41, a first flange 421 is arranged at the bottom end of the lower circular housing 42, the first disc 411 is in sealing sliding connection with the inner wall of the lower circular housing 42, and the first flange 421 is in sealing sliding connection with the side wall of the lower support column 41; the first flange 421, the side wall of the lower support column 41, the first disc 411 and the inner wall of the lower circular housing 42 form a second hydraulic space 90; the bottom wall of the annular hydraulic cylinder 21 is provided with a second hydraulic passage 212; a third hydraulic passage 4211 is arranged on the first flange 421, and the third hydraulic passage 4211 is in communication with the second hydraulic space 90; the third hydraulic passage 4211, the second hydraulic passage 212 and the multi-way hydraulic valve 60 are in pipeline communication; a pair of lower wedge-shaped clamps 43 are installed on the inner top wall of the lower circular housing 42, a lower wedge-shaped groove 412 is arranged on the lower support column 41, and the lower wedge-shaped clamp 43 is matched with the lower wedge-shaped groove 412; the steel strand 50 is fixedly connected with the steel truss 110 by penetrating through the lower circular housing 42, the pair of lower wedge-shaped clamps 43 and the lower wedge-shaped groove 412, and the lower wedge-shaped clamp 43 and the lower wedge-shaped groove 412 can clamp the steel strand 50.

[0034] The upper anchorage device 30 comprises an upper support column 31, an upper circular housing 32 and an upper wedge-shaped clamp 33, a second disc 311 is arranged on the side wall of the upper support column 31, a second flange 321 is arranged at the bottom end of the upper circular housing 32, the second disc 311 is in sealing sliding connection with the inner wall of the upper circular housing 32, and the second flange 321 is in sealing sliding connection with the side wall of the upper support column 31; the second flange 321, the side wall of the upper support column 31, the second disc 311 and the inner wall of the upper circular housing 32 form a third hydraulic space 100; a fourth hydraulic passage 3211 is arranged on the second flange 321, and the fourth hydraulic passage 3211 is in communication with the third hydraulic space 100; the fourth hydraulic passage 3211 and the multi-way hydraulic valve 60 are in pipeline communication; a pair of upper wedge-shaped clamps 33 are installed on the inner top wall of the upper circular housing 32, an upper wedge-shaped groove 312 is arranged on the upper support column 31, and the upper wedge-shaped clamp 33 is matched with the upper wedge-shaped groove 312; the steel strand 50 is fixedly connected with the steel truss 110 by penetrating through the upper circular housing 32, the pair of upper wedge-shaped clamps 33 and the upper wedge-shaped groove 312, and the upper wedge-shaped clamp 33 and the upper wedge-shaped groove 312 can clamp the steel strand 50.

[0035] Optionally, in an embodiment, the steel strand 50 is provided in plurality, the number of the pairs of the upper wedge-shaped clamp 33 and the lower wedge-shaped clamp 43, and the number of the upper wedge-shaped groove 312 and the lower wedge-shaped groove 412 are the same as that of the steel strand 50, the plurality of steel strands 50 improves the pulling force of a single lifting point, and the steel truss 110 with greater weight can be lifted.

[0036] Embodiment 2

[0037] A method for using a steel truss lifting device, comprising the following steps:

[0038] S1. Fixing the steel truss lifting device on the support platform, and the steel strand 50 is communicated with the steel truss 110 through the upper anchor device 30, the jack 20, the lower anchor device 40 and the support cylinder 10;

[0039] S2. The hydraulic pump 70 supplies oil to the third hydraulic space 100 through the multi-way hydraulic valve 60, the upper circular shell 32 moves downward relative to the upper support column 31, and the upper wedge-shaped clamping piece 33 moves into the upper wedge-shaped groove 312 to clamp the steel strand 50; the hydraulic pump 70 pumps oil from the second hydraulic space 90 through the multi-way hydraulic valve 60, the lower circular shell 42 moves upward relative to the lower support column 41, the hydraulic pressure in the second hydraulic space 90 is kept constant, and the lower wedge-shaped clamping piece 43 moves upward from the lower wedge-shaped groove 412 to release the steel strand 50;

[0040] S3. The hydraulic pump 70 supplies oil to the first hydraulic space 80 through the multi-way hydraulic valve 60, and the jacking cylinder 22 moves upward relative to the annular hydraulic cylinder 21, the jacking cylinder 22 jacks up the upper support column 31, and the steel truss 110 is lifted through the clamping of the steel strand 50 by the upper wedge-shaped clamping piece 33;

[0041] S4. The hydraulic pump 70 supplies oil to the second hydraulic space 90 through the multi-way hydraulic valve 60, and the lower circular shell 42 moves downward relative to the lower support column 41, and the lower wedge-shaped clamping piece 43 moves into the lower wedge-shaped groove 412 to clamp the steel strand 50;

[0042] S5. The hydraulic pump 70 pumps oil from the third hydraulic space 100 through the multi-way hydraulic valve 60, and the upper circular shell 32 moves upward relative to the upper support column 31, the hydraulic pressure in the third hydraulic space 100 is kept constant, and the upper wedge-shaped clamping piece 33 moves upward from the upper wedge-shaped groove 312 to release the steel strand 50;

[0043] S6. The hydraulic pump 70 pumps oil from the first hydraulic space 80 through the multi-way hydraulic valve 60, and the jacking cylinder 22 moves downward relative to the annular hydraulic cylinder 21, and the jacking cylinder 22 moves downward along with the upper anchor device 30 and the steel strand 50 until the bottom wall of the jacking cylinder 22 is in close contact with the bottom wall of the annular hydraulic cylinder 21;

[0044] S7. Repeat S2-S6 to continuously lift the steel truss 110 through the continuous cylinder reversal of the hydraulic jack 20, the upper anchor device 30 and the lower anchor device 40.

[0045] The above merely describes the specific embodiments of the present application, and the common knowledge of the specific structure and characteristics in the scheme is not described in detail. It should be noted that, for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the description can be used to explain the content of the claims.

[0046] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0047] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steel truss lifting device, characterized by, Comprise: Supporting cylinder (10), hydraulic jack (20), upper anchor device (30), lower anchor device (40), steel strand (50), multi-way hydraulic valve (60) and hydraulic pump (70), the hydraulic jack (20) comprises annular hydraulic cylinder (21) and jacking cylinder (22), the bottom wall of the jacking cylinder (22) is sealed slidingly connected in the annular hydraulic cylinder (21), and the bottom wall of the jacking cylinder (22) forms a first hydraulic space (80) with the annular hydraulic cylinder (21);The bottom wall of the supporting cylinder (10) is provided with a through hole (11) in the center, the lower anchor device (40) is fixedly arranged on the bottom wall of the supporting cylinder (10) and located above the through hole (11);The annular hydraulic cylinder (21) is fixedly arranged at the top end of the supporting cylinder (10), and the upper anchor device (30) is fixedly installed at the top end of the jacking cylinder (22);The steel strand (50) passes through the upper anchor device (30), the hydraulic jack (20), the lower anchor device (40) and the through hole (11) and is fixedly connected with a steel truss (110), and the upper anchor device (30) and the lower anchor device (40) can clamp the steel strand (50);The first hydraulic space (80), the upper anchor device (30) and the lower anchor device (40) are all in pipeline communication with the multi-way hydraulic valve (60), and the multi-way hydraulic valve (60) is in pipeline communication with the hydraulic pump (70). The lower anchorage device (40) comprises a lower support column (41), a lower circular shell (42) and a lower wedge-shaped clamp (43), a first disc (411) is arranged on the side wall of the lower support column (41), a first flange (421) is arranged at the bottom end of the lower circular shell (42), the first disc (411) is in sealing sliding connection with the inner wall of the lower circular shell (42), and the first flange (421) is in sealing sliding connection with the side wall of the lower support column (41); the first flange (421), the side wall of the lower support column (41), the first disc (411) and the inner wall of the lower circular shell (42) form a second hydraulic space (90); the bottom wall of the annular hydraulic cylinder (21) is provided with a second hydraulic passage (212); the first flange (421) is provided with a third hydraulic passage (4211), the third hydraulic passage (4211) communicates with the second hydraulic space (90); the third hydraulic passage (4211), the second hydraulic passage (212) and the multi-way hydraulic valve (60) are in pipeline communication; a pair of the lower wedge-shaped clamps (43) are installed on the inner top wall of the lower circular shell (42), the lower support column (41) is provided with a lower wedge-shaped groove (412), and the lower wedge-shaped clamp (43) is matched with the lower wedge-shaped groove (412); the steel strand (50) is fixedly connected with the steel truss (110) through the lower circular shell (42), the pair of lower wedge-shaped clamps (43) and the lower wedge-shaped groove (412), and the lower wedge-shaped clamp (43) and the lower wedge-shaped groove (412) can clamp the steel strand (50).

2. A steel truss lifting device according to claim 1, characterised in that, The bottom wall of the annular hydraulic cylinder (21) is provided with a first hydraulic passage (211), one end of the first hydraulic passage (211) communicates with the first hydraulic space (80), and the other end communicates with the multi-way hydraulic valve (60) in pipeline.

3. A steel truss lifting device according to claim 1, wherein, The upper anchorage device (30) comprises an upper support column (31), an upper circular shell (32) and an upper wedge-shaped clamp (33), a second disc (311) is arranged on the side wall of the upper support column (31), a second flange (321) is arranged at the bottom end of the upper circular shell (32), the second disc (311) is in sealing sliding connection with the inner wall of the upper circular shell (32), and the second flange (321) is in sealing sliding connection with the side wall of the upper support column (31); the second flange (321), the side wall of the upper support column (31), the second disc (311) and the inner wall of the upper circular shell (32) form a third hydraulic space (100); a fourth hydraulic passage (3211) is arranged on the second flange (321), the fourth hydraulic passage (3211) communicates with the third hydraulic space (100), and pipelines between the fourth hydraulic passage (3211) and the multi-way hydraulic valve (60) communicate; a pair of the upper wedge-shaped clamps (33) are installed on the inner top wall of the upper circular shell (32), an upper wedge-shaped groove (312) is arranged on the upper support column (31), and the upper wedge-shaped clamp (33) is matched with the upper wedge-shaped groove (312); the steel strand (50) is fixedly connected with a steel truss (110) through the upper circular shell (32), the pair of upper wedge-shaped clamps (33) and the upper wedge-shaped groove (312), and the upper wedge-shaped clamp (33) and the upper wedge-shaped groove (312) can clamp the steel strand (50).

4. A steel truss lifting device according to claim 3, characterised in that, The steel strand (50) is arranged in plurality, the number of the upper wedge-shaped clamps (33) and the lower wedge-shaped clamps (43) and the number of the upper wedge-shaped grooves (312) and the lower wedge-shaped grooves (412) are same as that of the steel strand (50).

5. A method of using a steel truss lifting device according to claim 3 or 4, characterised in that, The method comprises the following steps: S1. The steel truss lifting device is fixedly placed on the support platform, and the steel strand (50) passes through the upper anchorage device (30), the jack (20), the lower anchorage device (40) and the support cylinder (10) to communicate with the steel truss (110); S2. The hydraulic pump (70) supplies oil to the third hydraulic space (100) through the multi-way hydraulic valve (60), the upper circular shell (32) moves downward relative to the upper support column (31), drives the upper wedge-shaped clamp (33) to move into the upper wedge-shaped groove (312), and clamps the steel strand (50); the hydraulic pump (70) draws oil from the second hydraulic space (90) through the multi-way hydraulic valve (60), the lower circular shell (42) moves upward relative to the lower support column (41), the hydraulic pressure in the second hydraulic space (90) is kept constant, the lower wedge-shaped clamp (43) moves upward from the lower wedge-shaped groove (412), and the steel strand (50) is loosened. S3. Hydraulic pump (70) supplies oil to the first hydraulic space (80) through the multi-way hydraulic valve (60), the jacking cylinder (22) moves upward relative to the annular hydraulic cylinder (21), the jacking cylinder (22) jacks up the upper support column (31), through the clamping of the upper wedge-shaped clamping piece (33) to the steel strand (50), drives the lifting of the steel truss (110); S4. Hydraulic pump (70) supplies oil to the second hydraulic space (90) through the multi-way hydraulic valve (60), the lower circular housing (42) moves downward relative to the lower support column (41), drives the lower wedge-shaped clamping piece (43) to move into the lower wedge-shaped groove (412), clamps the steel strand (50); S5. Hydraulic pump (70) pumps oil out of the third hydraulic space (100) through the multi-way hydraulic valve (60), the upper circular housing (32) moves upward relative to the upper support column (31), keeps the hydraulic pressure in the third hydraulic space (100) constant, the upper wedge-shaped clamping piece (33) moves upward from the upper wedge-shaped groove (312), and the steel strand (50) is loosened; S6. Hydraulic pump (70) pumps oil out of the first hydraulic space (80) through the multi-way hydraulic valve (60), the jacking cylinder (22) moves downward relative to the annular hydraulic cylinder (21), the jacking cylinder (22) moves downward along with the upper anchor device (30) and the steel strand (50) until the bottom wall of the jacking cylinder (22) is in close contact with the bottom wall of the annular hydraulic cylinder (21); S7. Repeat S2-S6, through the continuous inversion of the hydraulic jack (20), the upper anchor device (30) and the lower anchor device (40), the continuous lifting of the steel truss (110) is realized.

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