CN116411578A - Prestressed support steel structure based on large-span foundation pit engineering - Google Patents
Prestressed support steel structure based on large-span foundation pit engineering Download PDFInfo
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- CN116411578A CN116411578A CN202310677395.8A CN202310677395A CN116411578A CN 116411578 A CN116411578 A CN 116411578A CN 202310677395 A CN202310677395 A CN 202310677395A CN 116411578 A CN116411578 A CN 116411578A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 80
- 239000010959 steel Substances 0.000 title claims abstract description 80
- 238000010276 construction Methods 0.000 claims description 10
- 238000009434 installation Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
- E02D5/765—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor removable
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The invention discloses a prestressed support steel structure based on large-span foundation pit engineering, which comprises a first support plate, a first support block, a first movable seat, a first jacking screw, a first fixed seat, a second jacking screw, a second movable seat, an adjustable support arm, a second support plate, a second support block and the like; according to the invention, the inner hexagonal wrench is inserted into the inner hexagonal groove at the upper side of the adjusting head, so that the movable column can push the locking gear to move downwards and separate from the driven gear I and the driven gear II, and the inner hexagonal wrench drives the adjusting head to rotate so as to drive the supporting block I to prop against the center of the inner side of the supporting plate I and the supporting block II to prop against the center of the inner side of the supporting plate II, thereby improving the convenience of operation in operation; the locking gear arranged in the supporting mechanism can clamp the driven gear I and the driven gear II, so that the screw rod I and the screw rod II can not loosen during supporting operation, and the reliability and the stability of long-time supporting operation are improved.
Description
Technical Field
The invention relates to the technical field of buildings, in particular to a prestressed support steel structure based on large-span foundation pit engineering.
Background
Along with the continuous development of society, the science is continuously advanced, and people's building engineering technology is more and more mature, and in order to keep the stability of large-span foundation ditch, all adopted the supporting steel construction in keeping large-span foundation ditch construction, and current prestressing force formula supporting steel construction is single supporting steel construction, so not only the stress area is little, in addition also causes the deformation damage of backup pad easily, so need increase the quantity of supporting steel, but like this the cost of increasing the construction easily, also be unfavorable for the construction operation in addition.
Disclosure of Invention
The invention aims to solve the problems, namely to provide a prestressed support steel structure based on large-span foundation pit engineering, which solves the problems that the existing prestressed support steel structure is a single support steel structure, the stress area is small, deformation and damage of a support plate are easy to cause, the number of support steel is required to be increased, the construction cost is easy to increase, and the construction operation is also unfavorable.
In order to solve the problems, the invention provides a technical scheme that: the utility model provides a prestressing force type support steel construction based on large-span foundation ditch engineering which innovation point lies in: the device comprises a first supporting plate, a first supporting block, a supporting mechanism, a square steel body, a first adjustable supporting arm, a first movable seat, a first tightening screw, a first fixed seat, a second tightening screw, a second movable seat, a second adjustable supporting arm, a second supporting plate and a second supporting block; a supporting mechanism is arranged in the square steel body; the left end part of the supporting mechanism is fixedly connected with a first supporting block, the left side of the first supporting block is connected with the center of the right side of the first supporting plate, the right end part of the supporting mechanism is fixedly connected with a second supporting block, and the right side of the second supporting block is connected with the center of the left side of the second supporting plate; the central inside of the movable seat I is transversely and movably connected with the left outside of the square steel body, and the adjustable support arms I at the four corners of the left side of the movable seat I are connected with the four corners of the right side of the support plate I; the first fixing seat is fixedly connected to the left outside of the square steel body, a plurality of threaded holes are formed in the periphery of the first fixing seat, the first tightening screws are movably connected in the threaded holes, and the left end parts of the first tightening screws are connected with the right side of the movable seat; the inner part of the center of the second movable seat is transversely and movably connected with the outer part of the right side of the square steel body, and four corner positions of the right side of the second movable seat are connected with four corner positions of the left side of the second support plate through the second adjustable support arm; the second fixing seat is fixedly connected to the right side of the square steel body, a plurality of threaded holes are formed in the periphery of the second fixing seat, the second tightening screw is movably connected to the threaded holes, and the right end of the second tightening screw is connected to the left side of the second movable seat.
Preferably, the specific structure of the supporting mechanism comprises a first telescopic steel tube, a first fixed nut, a first guide hole, a first screw rod, an adjusting head, a movable column, a driving gear, a second guide hole, a second screw rod, a second fixed nut, a second telescopic steel tube, a second driven gear, a locking gear, a sliding block, a spring, a groove and a first driven gear; the first guide hole is formed in the left center of the square steel body; the first screw is movably connected to the center of the right side of the guide hole, and the driven gear I is fixedly connected to the outer part of the right side of the first screw; the outer part of the telescopic steel tube I is transversely and movably connected with the inner part of the guide hole I, the left end part of the telescopic steel tube I is fixedly connected with a support block I, the right opening part of the telescopic steel tube I is fixedly connected with a fixing nut I, and the fixing nut I is connected with a screw rod I; the second guide hole is formed in the right center of the square steel body; the first screw is movably connected to the center of the left side of the guide hole II, and the outer part of the left side of the first screw is fixedly connected with the driven gear II; the outer part of the second telescopic steel tube is transversely and movably connected to the inner part of the second guide hole, the end part of the right side of the second telescopic steel tube is fixedly connected with a second supporting block, the opening part of the left side of the second telescopic steel tube is fixedly connected with a second fixing nut, and the second fixing nut is connected with the first screw rod; the driving gear is movably connected to the upper side of the inside of the center of the square steel body, the center of the upper side of the driving gear is fixedly connected with an adjusting head, and the tooth parts on the left side and the right side of the driving gear are respectively connected with the upper sides of the driven gear I and the driven gear II; the groove is formed in the bottom surface of the central inner part of the square steel body; the outer part of the sliding block is vertically and movably connected inside the groove, and the top of the sliding block is fixedly connected with a locking gear; the tooth parts at the left side and the right side of the locking gear are respectively connected with the lower sides of the driven gear I and the driven gear II; the bottom of the movable column is fixedly connected to the center of the top of the locking gear, and the outer part of the upper side of the movable column is respectively and movably connected to the central holes of the driving gear and the adjusting head.
Preferably, the screw thread of the first screw is opposite to the screw thread of the second screw.
Preferably, the first guide hole and the second guide hole are rectangular guide holes.
Preferably, an inner hexagonal groove is formed in the center of the upper side of the adjusting head.
Preferably, the second adjustable support arm is consistent with the first adjustable support arm in structure, and the specific structure of the first adjustable support arm comprises a first installation seat, a first ball groove, a first fixed cover, a first ball body, a first connecting arm, a first locking nut, a first stud, a connecting seat, a second stud, a second locking nut, a second connecting arm, a second ball body, a second fixed cover, a second installation seat and a second ball groove; a first ball groove is formed in the lower side of the mounting seat; the ball body I is movably connected in the ball groove I through the fixed cover I; the upper end part of the connecting arm I is fixedly connected with the ball I, and a threaded hole arranged in the center of the lower side of the connecting arm I is connected with the stud I; the outer part of the first stud is movably connected with a first locking nut, and the end part of the lower side of the stud is fixedly connected with the upper side of the connecting seat; a second ball groove is formed in the upper side of the second mounting seat; the second ball body is movably connected inside the second ball groove through the second fixed cover; the end part of the lower side of the second connecting arm is fixedly connected with the second ball body, and a threaded hole arranged in the center of the upper side of the second connecting arm is connected with the second stud; the second stud is externally and movably connected with a second locking nut, and the upper end part of the second stud is fixedly connected with the lower side of the connecting seat.
Preferably, the outer parts of the lower side and the upper side of the connecting arm are respectively provided with a rotation stopping clamping surface.
Preferably, the center of the connection seat is provided with an adjusting through hole.
Preferably, the outer side end surfaces of the first support block and the second support block are respectively provided with anti-skid patterns.
The invention has the beneficial effects that:
(1) The invention has the advantages of reasonable and simple structure, low production cost and convenient installation, and the inner hexagonal wrench is inserted into the inner hexagonal groove at the upper side of the adjusting head, so that the movable column can push the locking gear to move downwards to be separated from the driven gear I and the driven gear II, the adjusting head is driven by the inner hexagonal wrench to rotate so as to drive the supporting block I to prop against the center of the inner side of the supporting plate I and the supporting block II to prop against the center of the inner side of the supporting plate II, and the convenience of operation is improved.
(2) According to the invention, the first jacking screw and the second jacking screw are screwed, so that the first four adjustable supporting arms can respectively jack the inner side four corners of the first supporting plate and the second four adjustable supporting arms can respectively jack the inner side four corners of the second supporting plate, deformation and damage generated during supporting operation of the first supporting plate and the second supporting plate are avoided, and the stability of supporting operation is improved.
(3) The locking gear arranged in the supporting mechanism can clamp the driven gear I and the driven gear II, so that the screw rod I and the screw rod II can not loosen during supporting operation, and the reliability and the stability of long-time supporting operation are improved.
(4) The adjustable support arm I and the adjustable support arm II are arranged in the invention, and the length can be respectively adjusted according to the requirements, thereby bringing great convenience for the support use.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic cross-sectional view of fig. 1.
Fig. 3 is a schematic structural view of the supporting mechanism.
Fig. 4 is a schematic structural view of the first adjustable support arm.
1-a first supporting plate; 2-a first supporting block; 3-a supporting mechanism; 4-square steel body; 5-an adjustable support arm I; 6-a movable seat I; 7-pushing up the first screw; 8-a first fixing seat; 9-a second fixing seat; 10-pushing up the second screw; 11-a second movable seat; 12-an adjustable support arm II; 13-a second supporting plate; 14-a second supporting block; 31-a first telescopic steel tube; 32-fixing the first nut; 33-guide hole one; 34-screw one; 35-an adjustment head; 36-a movable column; 37-a drive gear; 38-a second guide hole; 39-screw II; 310-fixing a second nut; 311-a telescopic steel tube II; 312-driven gear two; 313-locking gear; 314-a slider; 315-spring; 316-groove; 317-driven gear one; 51-mount I; 52-ball groove I; 53-fixed cover one; 54-sphere one; 55-connecting arm I; 56-first lock nut; 57-stud one; 58-connecting seats; 59-a second stud; 510-locking a second nut; 511-connecting arm two; 512-sphere two; 513-a fixed cover II; 514-second mounting seat; 515-ball groove two.
Detailed Description
As shown in fig. 1 and 2, the following technical solutions are adopted in this embodiment: a prestressed support steel structure based on large-span foundation pit engineering comprises a first support plate 1, a first support block 2, a support mechanism 3, a square steel body 4, an adjustable support arm 5, a first movable seat 6, a first tightening screw 7, a first fixed seat 8, a second fixed seat 9, a second tightening screw 10, a second movable seat 11, an adjustable support arm 12, a second support plate 13 and a second support block 14; a supporting mechanism 3 is arranged in the square steel body 4; the left end part of the supporting mechanism 3 is fixedly connected with a first supporting block 2, the left side of the first supporting block 2 is connected with the center of the right side of the first supporting plate 1, the right end part of the supporting mechanism 3 is fixedly connected with a second supporting block 14, and the right side of the second supporting block 14 is connected with the center of the left side of the second supporting plate 13; the inside of the center of the movable seat I6 is transversely and movably connected with the outside of the left side of the square steel body 4, and the four corner positions of the left side of the movable seat I6 are respectively connected with the four corner positions of the right side of the supporting plate I1 by the adjustable supporting arms I5; the inside of the first fixing seat 8 is fixedly connected to the outside of the left side of the square steel body 4, a plurality of threaded holes are formed in the periphery of the first fixing seat 8, the threaded holes are movably connected with a first jacking screw 7, and the left end part of the first jacking screw 7 is connected with the right side of the first movable seat 6; the inside of the center of the second movable seat 11 is transversely and movably connected with the outside of the right side of the square steel body 4, and four corner positions on the right side of the second movable seat 11 are connected with four corner positions on the left side of the second support plate 13 through the second adjustable support arm 12; the inside fixed connection of fixing base two 9 is outside in square steel body 4 right side, the inside is equipped with the screw hole of several around fixing base two 9, and all swing joint has a tight screw two 10 in the screw hole, and tight screw two 10 right side tip all links to each other with movable seat two 11 left side.
As shown in fig. 3, the specific structure of the supporting mechanism 3 includes a first telescopic steel tube 31, a first fixed nut 32, a first guide hole 33, a first screw 34, an adjusting head 35, a movable column 36, a driving gear 37, a second guide hole 38, a second screw 39, a second fixed nut 310, a second telescopic steel tube 311, a second driven gear 312, a locking gear 313, a sliding block 314, a spring 315, a groove 316 and a first driven gear 317; the first guide hole 33 is formed in the left center of the square steel body 4; the first screw rod 34 is movably connected to the center of the right side of the first guide hole 33, and a driven gear 317 is fixedly connected to the outer part of the right side of the first screw rod 34; the outer part of the first telescopic steel tube 31 is transversely and movably connected to the inner part of the first guide hole 33, the left end part of the first telescopic steel tube 31 is fixedly connected with a first supporting block 2, the right opening of the first telescopic steel tube 31 is fixedly connected with a first fixing nut 32, and the first fixing nut 32 is connected with a first screw 34; the second guide hole 38 is formed in the right center of the square steel body 4; the first screw rod 34 is movably connected to the center of the left side of the second guide hole 38, and a second driven gear 312 is fixedly connected to the outer part of the left side of the first screw rod 34; the outer part of the second telescopic steel tube 311 is transversely and movably connected inside the second guide hole 38, the right end part of the second telescopic steel tube 311 is fixedly connected with the second supporting block 14, the left opening of the second telescopic steel tube 311 is fixedly connected with the second fixing nut 310, and the second fixing nut 310 is connected with the first screw rod 34; the driving gear 37 is movably connected to the upper side of the inside of the center of the square steel body 4, the adjusting head 35 is fixedly connected to the center of the upper side of the driving gear 37, and the tooth parts on the left side and the right side of the driving gear 37 are respectively connected with the upper sides of the driven gear I317 and the driven gear II 312; the groove 316 is formed on the bottom surface of the central inner part of the square steel body 4; the outside of the sliding block 314 is vertically and movably connected inside the groove 316, and a locking gear 313 is fixedly connected to the top of the sliding block 314; the left and right side teeth of the locking gear 313 are respectively connected with the lower sides of the driven gear I317 and the driven gear II 312; the bottom of the movable column 36 is fixedly connected to the center of the top of the locking gear 313, and the outer part of the upper side of the movable column 36 is movably connected to the central holes of the driving gear 37 and the adjusting head 35 respectively.
Wherein the screw thread of the screw one 34 is opposite to the screw thread of the screw two 39; the first guide hole 33 and the second guide hole 38 are rectangular guide holes; the adjusting head 35 is provided with a hexagonal groove in the center of the upper side, so that the adjusting head 35 is conveniently driven to rotate by an inner hexagonal wrench.
As shown in fig. 4, the second adjustable support arm 12 is identical to the first adjustable support arm 5 in structure, and the specific structure of the first adjustable support arm 5 includes a first mounting seat 51, a first ball groove 52, a first fixed cover 53, a first ball 54, a first connecting arm 55, a first locking nut 56, a first stud 57, a first connecting seat 58, a second stud 59, a second locking nut 510, a second connecting arm 511, a second ball 512, a second fixed cover 513, a second mounting seat 514, and a second ball groove 515; the lower side of the first mounting seat 51 is provided with a first ball groove 52; the first ball body 54 is movably connected inside the first ball groove 52 through the first fixed cover 53; the upper end part of the first connecting arm 55 is fixedly connected with the first ball 54, and a threaded hole arranged in the center of the lower side of the first connecting arm 55 is connected with the first stud 57; the outer part of the first stud 57 is movably connected with a first locking nut 56, and the end part of the lower side of the first stud 57 is fixedly connected with the upper side of a connecting seat 58; a second ball groove 515 is formed in the upper side of the second mounting seat 514; the second ball 512 is movably connected inside the second ball groove 515 through a second fixed cover 513; the end part of the lower side of the second connecting arm 511 is fixedly connected with the second ball 512, and a threaded hole arranged in the center of the upper side of the second connecting arm 511 is connected with the second stud 59; the second stud 59 is movably connected with a second locking nut 510, and the upper end of the second stud 59 is fixedly connected with the lower side of the connecting seat 58.
The outer parts of the lower side of the first connecting arm 55 and the upper side of the second connecting arm 511 are respectively provided with a rotation stopping clamping surface, so that the first connecting arm 55 and the second connecting arm 511 can not rotate when the length is adjusted; the center of the connecting seat 58 is provided with an adjusting through hole, so that a club can be conveniently inserted into the through hole to drive the connecting seat 58 to rotate; the outer side end surfaces of the first supporting block 2 and the second supporting block 14 are respectively provided with anti-skid patterns, so that no displacement is generated after supporting.
The use state of the invention is as follows: the invention has reasonable and simple structure, low production cost and convenient installation, when in use, firstly, the inner hexagonal wrench is inserted into the inner hexagonal groove at the upper side of the adjusting head 35, so that the movable column 36 pushes the locking gear 313 to move downwards to be separated from the driven gear 317 and the driven gear 312, the inner hexagonal wrench drives the adjusting head 35 to rotate so as to drive the supporting block 2 to tightly press the center of the inner side of the supporting plate 1 and the supporting block 14 to tightly press the center of the inner side of the supporting plate 13, thereby improving the convenience of operation, and then the pressing screw 7 and the pressing screw 10 are tightly pressed, thereby enabling the four adjustable supporting arms 5 to respectively press the inner four corners of the supporting plate 1, enabling the four adjustable supporting arms 12 to respectively press the inner four corners of the supporting plate 13, avoiding deformation damage to be generated when the supporting plate 1 and the supporting plate 13 are supported, further improving the stability of supporting operation, and the locking gear 313 arranged in the supporting mechanism 3 can tightly clamp the driven gear 317 and the driven gear 312, thereby ensuring that the screw 34 and the screw 39 are not loose when the supporting operation is performed, and the length of the supporting arms is required to be adjusted for a long time, and the stability is greatly improved, and the reliability is brought to the stability when the supporting mechanism is required to be adjusted.
The control mode of the invention is controlled by manual starting or by the existing automation technology, the wiring diagram of the power element and the supply of the power source are common knowledge in the field, and the invention is mainly used for protecting the mechanical device, so the invention does not explain the control mode and the wiring arrangement in detail.
In the description of the invention, it should be understood that the terms "coaxial," "bottom," "one end," "top," "middle," "another end," "upper," "one side," "top," "inner," "front," "center," "two ends," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, or be integrated; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms in the invention will be understood by those of ordinary skill in the art.
While the basic principles and main features of the invention and advantages of the invention have been shown and described, it will be understood by those skilled in the art that the invention is not limited by the foregoing embodiments, which are described in the foregoing description merely illustrate the principles of the invention, and that various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined in the appended claims and their equivalents.
Claims (9)
1. The utility model provides a prestressing force type support steel construction based on large-span foundation ditch engineering which characterized in that: the device comprises a first supporting plate (1), a first supporting block (2), a supporting mechanism (3), a square steel body (4), an adjustable supporting arm (5), a first movable seat (6), a first tightening screw (7), a first fixed seat (8), a second fixed seat (9), a second tightening screw (10), a second movable seat (11), a second adjustable supporting arm (12), a second supporting plate (13) and a second supporting block (14);
a supporting mechanism (3) is arranged inside the square steel body (4);
the left end part of the supporting mechanism (3) is fixedly connected with a first supporting block (2), the left side of the first supporting block (2) is connected with the right center of the first supporting plate (1), the right end part of the supporting mechanism (3) is fixedly connected with a second supporting block (14), and the right side of the second supporting block (14) is connected with the left center of the second supporting plate (13);
the center inside of the movable seat I (6) is transversely and movably connected to the left outside of the square steel body (4), and the four corner positions of the left side of the movable seat I (6) are respectively connected with the four corner positions of the right side of the support plate I (1) through the adjustable support arms I (5);
the inside of the first fixing seat (8) is fixedly connected to the outside of the left side of the square steel body (4), a plurality of threaded holes are formed in the periphery of the first fixing seat (8), a first jacking screw (7) is movably connected in each threaded hole, and the left end part of the first jacking screw (7) is connected with the right side of the first movable seat (6);
the inside of the center of the second movable seat (11) is transversely and movably connected with the outside of the right side of the square steel body (4), and four corners of the right side of the second movable seat (11) are connected with four corners of the left side of the second support plate (13) through the second adjustable support arm (12);
the fixing seat II (9) is fixedly connected to the right side of the square steel body (4), a plurality of threaded holes are formed in the periphery of the fixing seat II (9), the jacking screw II (10) is movably connected to the threaded holes, and the right side end of the jacking screw II (10) is connected with the left side of the movable seat II (11).
2. The prestressed support steel structure based on large-span foundation pit engineering of claim 1, wherein: the concrete structure of the supporting mechanism (3) comprises a first telescopic steel tube (31), a first fixed nut (32), a first guide hole (33), a first screw rod (34), an adjusting head (35), a movable column (36), a driving gear (37), a second guide hole (38), a second screw rod (39), a second fixed nut (310), a second telescopic steel tube (311), a second driven gear (312), a locking gear (313), a sliding block (314), a spring (315), a groove (316) and a first driven gear (317);
the first guide hole (33) is formed in the left center of the square steel body (4);
the first screw rod (34) is movably connected to the center of the right side of the first guide hole (33), and a driven gear (317) is fixedly connected to the outer part of the right side of the first screw rod (34);
the outside of the first telescopic steel tube (31) is transversely and movably connected inside the first guide hole (33), the left end part of the first telescopic steel tube (31) is fixedly connected with the first supporting block (2), the right opening of the first telescopic steel tube (31) is fixedly connected with the first fixing nut (32), and the first fixing nut (32) is connected with the first screw rod (34);
the second guide hole (38) is formed in the right center of the square steel body (4);
the first screw rod (34) is movably connected to the left center of the second guide hole (38), and the left outer part of the first screw rod (34) is fixedly connected with the second driven gear (312);
the outer part of the second telescopic steel tube (311) is transversely and movably connected inside the second guide hole (38), the right end part of the second telescopic steel tube (311) is fixedly connected with a second supporting block (14), the left opening of the second telescopic steel tube (311) is fixedly connected with a second fixing nut (310), and the second fixing nut (310) is connected with the first screw rod (34);
the driving gear (37) is movably connected to the upper side of the inside of the center of the square steel body (4), an adjusting head (35) is fixedly connected to the center of the upper side of the driving gear (37), and the tooth parts on the left side and the right side of the driving gear (37) are respectively connected with the upper sides of the driven gear I (317) and the driven gear II (312);
the groove (316) is formed on the bottom surface of the central inner part of the square steel body (4);
the outside of the sliding block (314) is vertically and movably connected inside the groove (316), and a locking gear (313) is fixedly connected to the top of the sliding block (314);
the tooth parts at the left side and the right side of the locking gear (313) are respectively connected with the lower sides of the driven gear I (317) and the driven gear II (312);
the bottom of the movable column (36) is fixedly connected to the center of the top of the locking gear (313), and the outer part of the upper side of the movable column (36) is movably connected to the central holes of the driving gear (37) and the adjusting head (35) respectively.
3. The prestressed support steel structure based on large-span foundation pit engineering of claim 2, wherein: the screw thread of the screw rod I (34) is opposite to the screw thread of the screw rod II (39).
4. The prestressed support steel structure based on large-span foundation pit engineering of claim 2, wherein: the first guide hole (33) and the second guide hole (38) are rectangular guide holes.
5. The prestressed support steel structure based on large-span foundation pit engineering of claim 2, wherein: an inner hexagonal groove is formed in the center of the upper side of the adjusting head (35).
6. The prestressed support steel structure based on large-span foundation pit engineering of claim 1, wherein: the adjustable support arm II (12) is consistent with the adjustable support arm I (5), and the specific structure of the adjustable support arm I (5) comprises a mounting seat I (51), a ball groove I (52), a fixed cover I (53), a ball I (54), a connecting arm I (55), a locking nut I (56), a stud I (57), a connecting seat (58), a stud II (59), a locking nut II (510), a connecting arm II (511), a ball II (512), a fixed cover II (513), a mounting seat II (514) and a ball groove II (515);
a ball groove I (52) is formed in the lower side of the mounting seat I (51);
the first ball body (54) is movably connected inside the first ball groove (52) through the first fixed cover (53);
the upper end part of the first connecting arm (55) is fixedly connected with the first ball body (54), and a threaded hole arranged in the center of the lower side of the first connecting arm (55) is connected with the first stud (57);
the outer part of the first stud (57) is movably connected with a first locking nut (56), and the end part of the lower side of the first stud (57) is fixedly connected with the upper side of the connecting seat (58);
a second ball groove (515) is formed in the upper side of the second mounting seat (514);
the second ball body (512) is movably connected inside the second ball groove (515) through the second fixed cover (513);
the end part of the lower side of the second connecting arm (511) is fixedly connected with the second ball body (512), and a threaded hole arranged in the center of the upper side of the second connecting arm (511) is connected with the second stud (59);
the second stud (59) is externally and movably connected with a second locking nut (510), and the upper end part of the second stud (59) is fixedly connected with the lower side of the connecting seat (58).
7. The prestressed support steel structure based on large-span foundation pit engineering of claim 6, wherein: the lower side of the first connecting arm (55) and the upper side of the second connecting arm (511) are respectively provided with a rotation stopping clamping surface.
8. The prestressed support steel structure based on large-span foundation pit engineering of claim 6, wherein: the center of the connecting seat (58) is provided with a through hole for adjustment.
9. The prestressed support steel structure based on large-span foundation pit engineering of claim 1, wherein: and the outer side end surfaces of the first supporting block (2) and the second supporting block (14) are respectively provided with anti-skid patterns.
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