CN110952434B - Variable-span double-support large-displacement front end support transverse moving device and transverse moving method for trestle - Google Patents
Variable-span double-support large-displacement front end support transverse moving device and transverse moving method for trestle Download PDFInfo
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- CN110952434B CN110952434B CN201911259208.4A CN201911259208A CN110952434B CN 110952434 B CN110952434 B CN 110952434B CN 201911259208 A CN201911259208 A CN 201911259208A CN 110952434 B CN110952434 B CN 110952434B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D15/00—Movable or portable bridges; Floating bridges
- E01D15/10—Travelling bridges, i.e. roller bridges; Sliding bridges; Rotary cylinder bridges, i.e. rotating about longitudinal axis to invert and raise the road
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D15/00—Movable or portable bridges; Floating bridges
- E01D15/005—Movable bridges in general ; Constructional elements peculiar to movable bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D18/00—Bridges specially adapted for particular applications or functions not provided for elsewhere, e.g. aqueducts, bridges for supporting pipe-lines
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/005—Piers, trestles, bearings, expansion joints or parapets specially adapted for portable or sectional bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
Abstract
The invention discloses a variable-span double-support large-displacement front end support transverse moving device for a trestle, which comprises a trestle girder and basic upright posts with telescopic legs, wherein the inner side of each basic upright post is provided with a horizontal section, the horizontal sections of the two basic upright posts form a sleeve structure, a transverse moving hydraulic cylinder is respectively arranged between each basic upright post and a middle fixing frame, and the two basic upright posts can move left and right under the driving of the respective corresponding transverse moving hydraulic cylinders; the front end of each trestle girder is provided with a telescopic leg, and the telescopic legs and the sleeve structures are arranged in a staggered manner from front to back; and a hoop component is arranged below the front part of each trestle girder and is used for sleeving the outer wall of the horizontal section of the basic upright column at the corresponding side. Meanwhile, the invention also discloses a variable-span double-support large-displacement front end support transverse moving method for the trestle. Under the premise of guaranteeing that the support transverse moving device at the front end of the trestle bears the load reliably, one-time transverse moving is realized, and the transverse moving times and the transverse moving time of the trestle are effectively shortened, so that the tunnel construction efficiency is improved.
Description
Technical Field
The invention relates to the technical field of tunnel construction trestles, in particular to a front end support transverse moving device and a transverse moving method, wherein the front end support transverse moving device is mainly applied to a tunnel 24-meter construction trestle (but not limited thereto), has a double-acting support structure with variable left and right support spans and is suitable for different excavation ground environments, and has a single trestle girder structure large-displacement transverse moving function.
Background
With the completion of the survey work of the current Tibetan line in China and the improvement of the project start construction schedule, the construction of tunnel projects faces increasingly complex geological conditions. In the tunnel construction project, the trestle is one of the most critical devices, is positioned between the excavation surface and the concrete inverted arch pouring section, and is the only access way for all tunnel excavation devices and transportation devices to enter and exit. In the work progress, the landing stage not only need be along with the construction progress in tunnel, moves by oneself forward, and in the work progress, the landing stage often needs realize the sideslip motion to the left and right sides in the tunnel in addition, not only provides working space for the excavation of construction equipment, also can provide working space for other equipment. Therefore, the working efficiency of the trestle determines the tunneling efficiency of the tunnel and determines the period of tunnel construction.
In recent years, a trestle is a standard supporting device for tunnel construction under certain geological conditions, and has the functions of bearing, passing in and out a channel and rapidly moving towards two sides of a tunnel. However, in the trestle released by various manufacturers all over the country at present, the front end transverse frame adopts a fixed frame structure, namely, the span of the upright posts on two sides of the front end of the trestle is not variable; the distance between the main beams at two sides of the trestle is limited by the width necessary for the vehicle to enter and exit, and the whole width of the trestle is limited by the sectional dimension of the tunnel and the working range of excavating equipment, so that the distance between the inner side surface of the support upright at the front end of the trestle and the outer side surface of the main beam is not more than 0.4 m, namely the transverse moving distance of the whole structure of the main beam of the trestle at a single time is less than 0.4 m, the transverse moving distance required by the trestle in the construction process is usually more than 2 m, and the auxiliary support of the middle trolley is required to transversely move the front end support frame during each transverse moving motion, so that under the ideal condition of flat excavated ground, the cycle period of the single transverse moving is as long as 0.5 hour, and the time required by the distance of more than 2 m is not less than 2.5 hours. Therefore, the supporting cross sliding frame of the front end fixing structure of the existing trestle becomes a bottleneck condition for limiting the improvement of the working efficiency of the trestle and becomes an influencing factor for limiting the progress of tunnel construction.
Disclosure of Invention
The invention aims to provide the front end supporting device capable of realizing single large-distance transverse movement on the premise of ensuring the reliable bearing function of the trestle front end supporting transverse movement device, so that one-time transverse movement is realized, the transverse movement times and the transverse movement time of the trestle are effectively shortened, and the tunnel construction efficiency is improved.
Therefore, the technical scheme adopted by the invention is as follows: a variable-span double-support large-displacement front end support traversing device for a trestle comprises two trestle girders which are arranged in bilateral symmetry, wherein the two trestle girders are connected into an H-shaped middle fixing frame through sleeper beams, basic upright columns with telescopic legs are respectively arranged at the left side and the right side of the front part of the middle fixing frame, the inner side of each basic upright column is provided with a horizontal section, the horizontal sections of the two basic upright columns form a sleeve structure, a traversing hydraulic cylinder is respectively arranged between each basic upright column and the middle fixing frame, and the two basic upright columns can move left and right under the driving of the corresponding traversing hydraulic cylinders so as to realize distance adjustment; the front end of each trestle girder is provided with a telescopic leg, and the telescopic legs and the sleeve structures are arranged in a staggered manner from front to back; and a hoop component is arranged below the front part of each trestle girder and is used for sleeving the outer wall of the horizontal section of the basic upright column at the corresponding side.
Preferably, the telescopic legs arranged at the front end of the trestle girder comprise a lifting hydraulic cylinder, a universal ball hinge and supporting legs, the lifting hydraulic cylinder is arranged in the trestle girder, and the lower end of the lifting hydraulic cylinder is connected with the upper ends of the supporting legs through the universal ball hinge.
Further preferably, the staple bolt subassembly includes that transition support, rear end fixed bearing, rear end intermediate transition support enclose the frame in the middle of front end fixed bearing, the front end, transition support about the intermediate transition support of front end coincide and install in the place ahead of sleeve structure, hydraulic cylinder passes behind the intermediate transition support of front end fixed bearing, front end to through the lower surface of middle transition support of middle flange plate installation in the front end, overlap about transition support and install in the rear of sleeve structure in the middle of rear end fixed bearing, the rear end, the frame is located sleeve structure's below is enclosed to the bottom, and the bottom encloses the frame about both ends link to each other with the bottom of transition support in the middle of front end intermediate transition support, the middle transition support of rear end respectively.
Further preferably, a screw ejector rod horizontally penetrates through the middle transition support at the rear end, and the front end of the screw ejector rod abuts against the side wall of the horizontal section of the basic upright post.
Preferably, the end of the piston rod of the traversing hydraulic cylinder is hinged to the mounting seat of the vertical section of the basic upright, the middle front part of the cylinder barrel of the traversing hydraulic cylinder is hinged to the mounting seat of the girder of the trestle, the tail part of the cylinder barrel of the traversing hydraulic cylinder is hinged to the roller bracket with the roller at the bottom, and the roller is supported on the upper surface of the horizontal section of the basic upright on the corresponding side.
Preferably, the front side and the rear side of a cylinder barrel of the transverse hydraulic cylinder are respectively provided with a pin shaft mounting blind hole, a main beam of the trestle is provided with a front mounting seat and a rear mounting seat, and the cylinder barrel is connected with the corresponding mounting seats through cylinder barrel pin shafts; and a lubricating sleeve is arranged between the roller bracket and the cylinder barrel of the transverse hydraulic cylinder, so that the roller bracket can rotate around the axis of the cylinder barrel.
Further preferably, the horizontal section and the vertical section of the basic upright are cylinders, a built-in hydraulic cylinder and an upright telescopic sleeve are arranged in the vertical section, and the bottom of the upright telescopic sleeve is provided with a fixed lengthened supporting leg to jointly form a telescopic leg of the basic upright.
Meanwhile, the invention also discloses a variable-span double-support large-displacement front end support transverse moving method for the trestle, which comprises the variable-span double-support large-displacement front end support transverse moving device for the trestle, and comprises the following steps of:
firstly, a lifting hydraulic cylinder arranged in a main beam of a right trestle extends downwards, a supporting leg at the bottom of a piston rod is contacted with the ground, a telescopic leg of a basic upright column on the right side is folded upwards, and the self weight of the trestle structure is born by the lifting hydraulic cylinders arranged in the basic upright column on the left side and the main beam of the right trestle;
secondly, horizontally extending a traversing hydraulic cylinder between the right basic upright post and the main beam of the right trestle outwards to drive the right basic upright post to horizontally extend outwards, thereby changing the span between the left basic upright post and the right basic upright post;
thirdly, stretching the telescopic legs of the basic upright columns on the right side downwards to contact with the ground, and meanwhile, retracting the lifting hydraulic cylinders arranged in the main beams of the trestle on the right side upwards to separate from the ground, wherein the dead weight of the trestle is born by the basic upright columns which are stretched in the left and right sides in a span manner;
fourthly, horizontally retracting the transverse hydraulic cylinder between the right basic upright post and the right trestle girder inwards, horizontally extending the transverse hydraulic cylinder between the left basic upright post and the left trestle girder outwards, and matching the transverse hydraulic cylinder at the other end of the trestle in the length direction to act to realize the integral right transverse movement of the trestle girder;
fifthly, extending a lifting hydraulic cylinder built in the main beam of the left trestle downwards, contacting the ground by using a supporting leg at the bottom of the piston rod, and simultaneously retracting a telescopic leg of the left basic upright column upwards, wherein the dead weight of the trestle structure is born by the right basic upright column and the lifting hydraulic cylinder built in the main beam of the left trestle;
sixthly, horizontally retracting the transverse hydraulic cylinder between the left basic upright post and the left trestle girder inwards; and seventhly, the telescopic leg of the left basic upright column extends downwards to be in contact with the ground, and the telescopic leg of the left trestle main beam is lifted upwards to be separated from the ground.
The invention has the beneficial effects that: the device is focused around the problem of how to shorten the traverser moving time, under the reliable prerequisite of guaranteeing that the traverser moving device is supported to the landing stage front end, adopts three key measures: (1) adding horizontal sections on the inner sides of the two basic upright columns to form a sleeve structure, and adjusting the distance by combining the two transverse hydraulic cylinders; (2) the front end of each trestle girder is provided with a telescopic leg which is staggered with the sleeve structure in the front and back direction and is used as a support when the basic upright post moves transversely and an auxiliary support when the trestle is constructed; (3) the hoop assembly is integrated with the hoop assembly for ensuring transverse movement guiding and safety; the large-displacement transverse moving movement of the trestle is realized at one time, so that the technical bottleneck that the transverse moving time is long due to short distance and multiple transverse movements of the trestle is greatly shortened, and the restriction factor influencing the construction progress is solved.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a front view of the left and right base pillars.
Fig. 4 is a top view of fig. 3.
FIG. 5 is a front view of the installation of the traverse cylinder.
Fig. 6 is a top view of fig. 5.
Fig. 7 is a side view of the installation of the hydraulic lifting cylinder and hoop assembly.
Fig. 8 is a schematic diagram of the working process of the present invention.
Detailed Description
The present invention will be further explained by the following embodiments with reference to the drawings, wherein the tunnel length direction is taken as the front-back direction, and the tunnel width direction is taken as the left-right direction:
referring to fig. 1-7, the variable-span double-support large-displacement front end support traversing device for the trestle mainly comprises a basic upright post 1, a trestle girder 2, a sleeper beam 3, a traversing hydraulic cylinder 4, a hoop component 5, a lifting hydraulic cylinder 6, a universal ball hinge 7, a support leg 8, a spiral ejector rod 9, a roller 10, a roller support 11, a cylinder pin shaft 12, an upright post telescopic sleeve 13, a fixed lengthened support leg 14 and a lubricating sleeve 15.
Two landing stage girder 2 bilateral symmetry set up, and two landing stage girder 2 connect into the middle mount A of "H" shape by sleeper beam 3, and middle mount A is unanimous with landing stage length. A running board 16 is laid above the middle fixing frame A. The left and right sides of the front part of the middle fixing frame A are respectively provided with a basic upright post 1 with a telescopic leg. Basic upright posts 1 of the telescopic legs, main beams 2 of the trestle, sleeper beams 3 and running boards 16 are indispensable components of the trestle and are not described in detail herein.
The inside of each basic upright 1 is provided with a horizontal section 1a, so that the basic upright 1 consists of a horizontal section 1a and a vertical section 1 b. Preferably, the horizontal section 1a and the vertical section 1b are both cylindrical. A built-in hydraulic cylinder (not shown in the figure) and a stand column telescopic sleeve 13 are arranged in the vertical section 1b, and a fixed lengthened supporting leg 14 is arranged at the bottom of the stand column telescopic sleeve 13 to jointly form a telescopic leg of the basic stand column 1. The vertical section 1b and the upright post telescopic sleeve 13 form a sliding sleeve, and under the driving of the built-in hydraulic cylinder, the upright post telescopic sleeve 13 and the fixed lengthened supporting leg 14 move up and down relative to the vertical section 1b together to realize the telescopic effect.
The horizontal sections 1a of the two basic columns 1 form a sleeve structure B, so that the horizontal sections 1a of the two basic columns 1 are different in cross section.
A traversing hydraulic cylinder 4 is respectively arranged between each basic upright post 1 and the middle fixing frame A. The two basic upright columns 1 can move left and right under the driving of the corresponding transverse hydraulic cylinders 4, and the opposite movement or the back movement is realized, so that the distance between the two basic upright columns 1 is adjusted. When the hydraulic cylinder works, a piston rod of the left lateral moving hydraulic cylinder extends outwards to drive the left basic upright post to extend outwards relative to the right basic upright post; in a similar way, the piston rod of the right side transverse hydraulic cylinder extends outwards and can drive the right side basic upright post to extend outwards relative to the left side basic upright post, so that the function of increasing the span between the left and right side basic upright posts is realized, and the large-displacement transverse movement of the integral structure of the main beam of the trestle can be realized by a single time. When the span between the basic columns on the left side and the right side needs to be reduced, the piston rod is retracted.
Preferably, the end part of a piston rod of the traversing hydraulic cylinder 4 is hinged on a mounting seat of a vertical section 1b of the basic upright post 1, and the middle front part of a cylinder barrel of the traversing hydraulic cylinder 4 is hinged on a mounting seat of a main beam 2 of the trestle; because this sideslip pneumatic cylinder is longer, for avoiding appearing the tail and disturbing the phenomenon down, add the gyro wheel support of taking the gyro wheel at the cylinder afterbody. The tail part of the cylinder barrel of the transverse hydraulic cylinder 4 is hinged on a roller bracket 11, and the bottom of the roller bracket 11 is provided with a roller 10. The rollers 10 are supported on the upper surface of the horizontal section 1a of the base column 1 on the corresponding side. A lubricating sleeve 15 is preferably arranged between the roller bracket 11 and the cylinder barrel of the traversing hydraulic cylinder 4, so that the roller bracket 11 can rotate around the axis of the cylinder barrel, and the phenomenon of distortion of the cylinder barrel caused by uneven steel structure surface is avoided.
In addition, for convenient arrangement, the front side and the rear side of the cylinder barrel of the transverse hydraulic cylinder 4 are respectively provided with a pin shaft mounting blind hole, the girder 2 of the trestle is provided with a front mounting seat and a rear mounting seat, and the cylinder barrel is connected with the corresponding mounting seats through a cylinder barrel pin shaft 12.
As shown in fig. 7, the front end of each trestle girder 2 is provided with a telescopic leg, and is arranged in a staggered manner from front to back with respect to the sleeve structure B. Preferably, the telescopic leg arranged at the front end of the trestle girder 2 consists of a lifting hydraulic cylinder 6, a universal ball joint 7 and a supporting foot 8. The lifting hydraulic cylinder 6 is arranged in the trestle girder 2, and the lower end of the lifting hydraulic cylinder 6 is connected with the upper ends of the supporting legs 8 through universal ball joints 7; when a piston rod of the lifting hydraulic cylinder extends out, the universal ball hinge is contacted with the ground through the supporting leg and is used for bearing the dead weight of the trestle; and can adapt to the inside excavation ground of rugged and uneven tunnel through the mode of universal ball pivot.
And a hoop component 5 is arranged below the front part of each trestle girder 2 and is used for being sleeved on the outer wall of the horizontal section 1a of the basic upright post 1 at the corresponding side.
As shown in fig. 7, the hoop assembly 5 preferably comprises a front end fixing support 5a, a front end intermediate transition support 5b, a rear end fixing support 5c, a rear end intermediate transition support 5d and a bottom surrounding frame 5 e. The front end fixed support 5a and the front end middle transition support 5B are vertically overlapped and installed in front of the sleeve structure B. The lifting hydraulic cylinder 6 passes through the front end fixed support 5a and the front end middle transition support 5b and is arranged on the lower surface of the front end middle transition support 5b through the middle flange 6 a. The rear end fixed support 5c and the rear end middle transition support 5d are vertically overlapped and installed behind the sleeve structure B. The bottom enclosing frame 5e is positioned below the sleeve structure B, and the left end and the right end of the bottom enclosing frame 5e are respectively connected with the bottoms of the front-end middle transition support 5B and the rear-end middle transition support 5 d. Finally, trestle girder 2, front end fixing support 5a, transition support 5B in the middle of the front end, rear end fixing support 5c, transition support 5d in the middle of the rear end and bottom enclose frame 5e and enclose the periphery at sleeve structure B jointly, cramp sleeve structure B.
Preferably, a screw ejector rod 9 horizontally penetrates through the middle transition support 5d at the rear end, the front end of the screw ejector rod 9 is abutted against the side wall of the horizontal section 1a of the basic upright post 1, and the gap between the side face of the hoop component and the two side faces of the sleeve of the basic upright post is adjusted through the screw ejector rod, so that abnormal sound caused by looseness in the use process is avoided.
The single large-displacement front end supporting transverse moving device is mainly suitable for a single large-displacement front end supporting transverse moving device which is used for a 24-meter construction trestle of a tunnel and has a variable left and right supporting span and a double-acting supporting structure suitable for different excavation ground conditions; the beam between the left basic column and the right basic column is set to be a telescopic sleeve structure, the lower end face of a main beam of the trestle is respectively connected with an outer sleeve and an inner sleeve of the telescopic beam, and the connecting device is an assembled hoop component; horizontal moving hydraulic cylinders capable of horizontally extending and retracting are respectively arranged between the left basic upright column and the right basic upright column and the main beam of the trestle, the span between the left basic upright column and the right basic upright column is changed through the extension and retraction of the horizontal moving hydraulic cylinders, and the large-displacement horizontal moving of the integral structure of the main beam of the trestle can be realized; but landing stage girder inside is provided with vertical flexible hydraulic cylinder, can regard as the vertical supporting load's of landing stage auxiliary operating means, also be simultaneously left side and right side basic column when changing the span, with one of the bearing structure of ground contact.
A method for supporting and transversely moving the front end of a trestle with variable span and double supports and large displacement comprises the device for supporting and transversely moving the front end of the trestle with variable span and double supports and large displacement, and comprises the following steps:
firstly, a lifting hydraulic cylinder arranged in a main beam of a right trestle extends downwards, the supporting leg at the bottom of a piston rod is contacted with the ground, and meanwhile, a telescopic leg of a basic upright column on the right side is folded upwards, and the self weight of the trestle structure is born by the lifting hydraulic cylinders arranged in the basic upright column on the left side and the main beam of the right trestle as shown in fig. 8 a;
secondly, horizontally extending a traversing hydraulic cylinder between the right basic upright post and the main beam of the right trestle outwards to drive the right basic upright post to horizontally extend outwards, so as to change the span between the left basic upright post and the right basic upright post, as shown in fig. 8 b;
thirdly, extending the telescopic legs of the basic upright columns on the right side downwards to be in contact with the ground, and simultaneously retracting the lifting hydraulic cylinders arranged in the main beams of the trestle on the right side upwards to be separated from the ground, wherein the dead weight of the trestle is born by the basic upright columns which are drawn by the spans on the left side and the right side, as shown in fig. 8 c;
fourthly, horizontally retracting the transverse hydraulic cylinder between the right basic upright post and the right trestle girder inwards, horizontally extending the transverse hydraulic cylinder between the left basic upright post and the left trestle girder outwards, and matching the transverse hydraulic cylinder at the other end of the trestle in the length direction to act to realize the integral right transverse movement of the trestle girder, wherein the transverse movement distance can reach about 2 meters, and the integral one-time transverse movement of the trestle is realized without multiple small-displacement transverse movements, as shown in fig. 8 d;
fifthly, extending a lifting hydraulic cylinder built in the main beam of the left trestle downwards, contacting the ground by using a supporting leg at the bottom of the piston rod, and simultaneously retracting a telescopic leg of the basic upright column on the left side upwards, wherein the dead weight of the trestle structure is borne by the lifting hydraulic cylinder built in the basic upright column on the right side and the main beam of the left trestle as shown in fig. 8 e;
sixthly, horizontally retracting the transverse hydraulic cylinder between the left basic upright post and the left trestle girder inwards, as shown in fig. 8 f;
seventhly, the telescopic leg of the left basic upright column extends downwards to be in contact with the ground, and the telescopic leg of the main beam of the left trestle is lifted upwards to be separated from the ground, as shown in fig. 8 g.
If the single large-displacement transverse movement of the trestle is to be realized to the left side of the tunnel, the working process is consistent with the single large-displacement transverse movement of the trestle to the right side of the tunnel, and the left side and the right side can be interchanged.
Meanwhile, the vertical hydraulic cylinders arranged in the trestle girders on the left side and the right side can be used as a front end supporting structure during the transverse movement of the trestle, and can form the front end supporting structure during the working of the trestle together with the basic upright columns on the outer sides of the trestle girders, so that the safety redundancy and the reliability are ensured.
The variable-span double-support large-displacement front end supporting and traversing device for the trestle has triple functions, firstly, the span between the basic stand columns on the two sides can be changed through the transverse telescopic structures of the basic stand columns on the left side and the right side, the overlarge displacement during the traversing of the integral structure of the trestle girder is realized, the single traversing can be in place, and the time waste caused by repeated traversing is avoided; secondly, the distance between the basic columns on the two sides can be shortened to be shortest, the span of the simply supported beam is reduced, the stress of the supporting and traversing device can be reduced, the overall width size of the trestle during working is reduced as much as possible, and a wider space is provided for the construction of other equipment; and thirdly, through the arrangement of the built-in lifting hydraulic cylinders of the main beams of the trestle at two sides, the auxiliary transverse moving function is realized, and redundancy and higher working reliability can be provided for the vertical load support of the trestle.
Claims (6)
1. The utility model provides a landing stage supports sideslip device with variable span dual bracing big displacement front end, includes landing stage girder (2) that two bilateral symmetry set up, and two landing stage girders (2) are connected into middle mount (A) of "H" shape by sleeper beam (3), and one that respectively sets up in the anterior left and right sides of middle mount (A) has basic stand (1) of flexible leg, its characterized in that: the inner side of each basic upright post (1) is provided with a horizontal section (1 a), the horizontal sections (1 a) of the two basic upright posts (1) form a sleeve structure (B), a transverse hydraulic cylinder (4) is respectively arranged between each basic upright post (1) and the middle fixing frame (A), and the two basic upright posts (1) can move left and right under the driving of the corresponding transverse hydraulic cylinders (4) so as to realize the distance adjustment; the front end of each trestle girder (2) is provided with a telescopic leg, and the telescopic legs and the sleeve structure (B) are arranged in a staggered manner from front to back; a hoop component (5) is arranged below the front part of each trestle girder (2) and is used for being sleeved on the outer wall of the horizontal section (1 a) of the basic upright post (1) on the corresponding side;
the telescopic leg arranged at the front end of the trestle girder (2) comprises a lifting hydraulic cylinder (6), a universal ball hinge (7) and a supporting leg (8), the lifting hydraulic cylinder (6) is installed in the trestle girder (2), and the lower end of the lifting hydraulic cylinder (6) is connected with the upper end of the supporting leg (8) through the universal ball hinge (7);
staple bolt subassembly (5) enclose frame (5 e) including transition support (5B) in the middle of front end fixed bearing (5 a), front end, rear end fixed bearing (5 c), transition support (5 d) in the middle of the rear end and bottom, overlap from top to bottom and install in the place ahead of sleeve structure (B) in the middle of front end fixed bearing (5 a), the front end, pass behind transition support (5B) in the middle of front end in hydraulic cylinder (6) pass front end fixed bearing (5 a), front end to install the lower surface at transition support (5B) in the middle of the front end through middle ring flange (6 a), overlap from top to bottom and install the rear at sleeve structure (B) in transition support (5 d) in the middle of rear end fixed bearing (5 c), the rear end, bottom encloses frame (5 e) and is located the below of sleeve structure (B), and the bottom encloses about both ends of frame (5 e) respectively with transition support (5B) in the middle of the front end, The bottom of the middle transition support (5 d) at the rear end is connected.
2. The variable-span double-support large-displacement front end support traversing device for the trestle according to claim 1, wherein: a screw ejector rod (9) horizontally penetrates through the rear end middle transition support (5 d), and the front end of the screw ejector rod (9) is tightly propped against the side wall of the horizontal section (1 a) of the basic upright post (1).
3. The variable-span double-support large-displacement front end support traversing device for the trestle according to claim 1, wherein: the end part of a piston rod of the transverse hydraulic cylinder (4) is hinged to a mounting seat of a vertical section (1 b) of the basic upright post (1), the middle front part of a cylinder barrel of the transverse hydraulic cylinder (4) is hinged to the mounting seat of the trestle girder (2), the tail part of the cylinder barrel of the transverse hydraulic cylinder (4) is hinged to a roller bracket (11) with a roller (10) at the bottom, and the roller (10) is supported on the upper surface of a horizontal section (1 a) of the basic upright post (1) on the corresponding side.
4. The variable-span double-support large-displacement front end support traversing device for the trestle according to claim 3, wherein: the front side and the rear side of a cylinder barrel of the transverse hydraulic cylinder (4) are respectively provided with a pin shaft mounting blind hole, a main beam (2) of the trestle is provided with a front mounting seat and a rear mounting seat, and the cylinder barrel is connected with the corresponding mounting seats through cylinder barrel pin shafts (12); a lubricating sleeve (15) is arranged between the roller bracket (11) and the cylinder barrel of the transverse hydraulic cylinder (4), so that the roller bracket (11) can rotate around the axis of the cylinder barrel.
5. The variable-span double-support large-displacement front end support traversing device for the trestle according to claim 4, wherein: the horizontal section (1 a) and the vertical section (1 b) of the basic upright post (1) are cylinders, a built-in hydraulic cylinder and an upright post telescopic sleeve (13) are arranged in the vertical section (1 b), and fixed lengthened supporting legs (14) are arranged at the bottom of the upright post telescopic sleeve (13) to jointly form telescopic legs of the basic upright post (1).
6. A method for transversely moving a variable-span double-support large-displacement front end support for a trestle, which is characterized by comprising the variable-span double-support large-displacement front end support transversely moving device for the trestle as set forth in any one of claims 1 to 5, and the method comprises the following steps:
firstly, a lifting hydraulic cylinder arranged in a main beam of a right trestle extends downwards, a supporting leg at the bottom of a piston rod is contacted with the ground, a telescopic leg of a basic upright column on the right side is folded upwards, and the self weight of the trestle structure is born by the lifting hydraulic cylinders arranged in the basic upright column on the left side and the main beam of the right trestle;
secondly, horizontally extending a traversing hydraulic cylinder between the right basic upright post and the main beam of the right trestle outwards to drive the right basic upright post to horizontally extend outwards, thereby changing the span between the left basic upright post and the right basic upright post;
thirdly, stretching the telescopic legs of the basic upright columns on the right side downwards to contact with the ground, and meanwhile, retracting the lifting hydraulic cylinders arranged in the main beams of the trestle on the right side upwards to separate from the ground, wherein the dead weight of the trestle is born by the basic upright columns which are stretched in the left and right sides in a span manner;
fourthly, horizontally retracting the transverse hydraulic cylinder between the right basic upright post and the right trestle girder inwards, horizontally extending the transverse hydraulic cylinder between the left basic upright post and the left trestle girder outwards, and matching the transverse hydraulic cylinder at the other end of the trestle in the length direction to act to realize the integral right transverse movement of the trestle girder;
fifthly, extending a lifting hydraulic cylinder built in the main beam of the left trestle downwards, contacting the ground by using a supporting leg at the bottom of the piston rod, and simultaneously retracting a telescopic leg of the left basic upright column upwards, wherein the dead weight of the trestle structure is born by the right basic upright column and the lifting hydraulic cylinder built in the main beam of the left trestle;
sixthly, horizontally retracting the transverse hydraulic cylinder between the left basic upright post and the left trestle girder inwards; and seventhly, the telescopic leg of the left basic upright column extends downwards to be in contact with the ground, and the telescopic leg of the left trestle main beam is lifted upwards to be separated from the ground.
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