CN113931082A - Cantilever cast-in-place hanging basket rail leveling device and leveling method thereof - Google Patents
Cantilever cast-in-place hanging basket rail leveling device and leveling method thereof Download PDFInfo
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- CN113931082A CN113931082A CN202111271751.3A CN202111271751A CN113931082A CN 113931082 A CN113931082 A CN 113931082A CN 202111271751 A CN202111271751 A CN 202111271751A CN 113931082 A CN113931082 A CN 113931082A
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/10—Cantilevered erection
- E01D21/105—Balanced cantilevered erection
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Abstract
The invention discloses a cantilever cast-in-place hanging basket rail leveling device and a leveling method thereof, wherein the leveling device comprises a plurality of leveling units arranged along the length direction of a hanging basket rail, and each leveling unit comprises a supporting part and an adjusting part; the support part comprises a lower steel plate arranged on the ground, a plurality of high-strength studs are arranged on the lower steel plate, the top ends of the high-strength studs penetrate through the upper steel plate, and leveling nuts are arranged on the high-strength studs on the lower surface of the upper steel plate; the traditional process is changed by using the piston type sand box, the difficult problems that the heights of all main truss tracks are inconsistent and the like caused by longitudinal and transverse slopes of a bridge are overcome, and the stability of the hanging basket track is improved. The problems that the leveling efficiency is low, the leveling structural strength cannot be guaranteed, the leveling cannot be accurately performed and the like in the traditional process can be solved. Meanwhile, the invention has the characteristics of high stability, repeated use, energy conservation, environmental protection, convenient storage and the like, has obvious economic benefit and has certain application and popularization values.
Description
Technical Field
The invention relates to the field of hanging basket construction in cantilever cast-in-place engineering, in particular to a cantilever cast-in-place hanging basket rail leveling device and a leveling method thereof.
Background
The hanging basket suspension casting process has the characteristics of no terrain, small influence on ground traffic and the like, is an effective method for crossing roads, rivers or complex terrains in the current situation, and has an important position in the field of bridge engineering.
The hanging basket is a bearing framework which can slide or roll along the top of the beam. The hanging basket is anchored and hung on the constructed beam section to provide an aerial platform for the next section of construction operation. After the construction of one section is finished, the hanging basket can move forwards and be fixed, the construction of the next section is carried out, and the operation is circulated until the cantilever is poured. In the existing hanging basket suspension casting technology, the mounting quality of a hanging basket is a key influencing the casting quality and construction safety, and particularly the flatness of a hanging basket rail directly influences the stability of a main truss and the uniform stress of the main truss. Under the influence of factors such as bridge transverse slope and longitudinal slope, the distance between the main girder of the hanging basket rail and the ground usually changes within a certain range, so that the rail needs to be leveled. The common rail leveling methods at present include a high-strength mortar leveling method and a profile steel pad beam leveling method.
High-strength mortar leveling method: before the track is installed, the height of the track is determined through measurement and paying-off, then high-strength mortar is vertically cast to the bottom height of the track according to the designed position of the track, and the high-strength mortar is used as a track foundation after being maintained to have certain strength. Although the method can achieve the purpose of leveling, in actual construction, the hanging basket is broken in the using process due to the frequent occurrence of insufficient mortar strength, insufficient mortar maintenance, small mortar thickness and the like, and the stability of the hanging basket installation is reduced due to different damage degrees of mortar cushions under different tracks and the occurrence of settlement or deviation.
Leveling method of the steel pad beam: the track leveling is realized by arranging the pad beam below the track. However, the pad beam is generally formed by processing I-shaped steel or double-spliced channel steel, the height of the pad beam is the existing specification of the market, the height can not be adjusted along with the longitudinal slope and the transverse slope of the bridge, the height can only be gradually changed by filling a thin steel plate in the gap between the pad beam and the bottom of the track, and the problems of track deformation, overlarge deformation of the flange of the profile steel and the like caused by unrealized filling of the pad are solved.
In order to solve the problems existing in the traditional hanging basket rail leveling technology, breakthrough in a brand new direction is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problems that under the influence of factors such as bridge cross slopes and longitudinal slopes, the heights of hanging basket tracks under different main trusses are inconsistent, and the height adjustment difficulty of a lower section hanging basket track before hanging basket walking each time is large.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a cantilever cast-in-place hanging basket rail leveling device comprises a plurality of leveling units arranged along the length direction of a hanging basket rail, wherein each leveling unit comprises a supporting part and an adjusting part; the support part comprises a lower steel plate arranged on the ground, a plurality of high-strength studs are arranged on the lower steel plate, the top ends of the high-strength studs penetrate through the upper steel plate, and leveling nuts are arranged on the high-strength studs on the lower surface of the upper steel plate;
the adjusting part comprises a piston type sand box placed on the lower steel plate and is positioned in the middle of the high-strength stud; the bottom of the side wall of the lower box body of the piston type sand box is provided with a sand discharge nozzle which penetrates through the side wall of the piston type sand box, the sand discharge nozzle is provided with a valve, the piston type sand box further comprises an upper cover box which is sleeved above the lower box body, and the upper surface of the upper cover box is tightly abutted to an upper steel plate through a cushion layer; the high-strength stud upper fastening nut is arranged on the upper surface of the upper steel plate;
the hanging basket rail is placed on the upper steel plate.
In particular, the cushion layer is a homogeneous steel plate.
In particular, a timing sand stop pin is arranged at one end of the sand discharge nozzle, which is close to the piston type sand box.
Particularly, the sand recovery box is used for recovering the refined sand.
In particular to a leveling method of a cantilever cast-in-situ hanging basket rail leveling device, which comprises the following steps:
s1, when a hanging basket is installed on a first section of a suspension casting beam, calculating the elevation of an upper steel plate of a leveling unit under each track in advance according to longitudinal and transverse slopes;
s2, arranging the lower steel plate and the high-strength studs in the length direction of the track according to a designed interval, wherein the axis of the lower steel plate is overlapped with the axis of the hanging basket track;
s3, placing a piston type sand box on the axis of the lower steel plate of each leveling unit, and adjusting the height of an upper cover box of the piston type sand box by using a sand discharge nozzle and a valve; accurately installing a cushion layer and an upper steel plate after the elevation adjustment of an upper cover box of the piston type sand box is consistent, and screwing a fastening nut and then screwing a leveling nut to finish primary leveling;
s4, hoisting a hanging basket rail to enable the hanging basket rail to be placed in the middle of the axis of the upper steel plate, and installing the rest components of the hanging basket;
s5, after the suspension casting section is tensioned and has a hanging basket forward moving condition, arranging a piston type sand box on the axis of the next section of track according to the steps S2 and S3, adjusting the elevation to be consistent with the elevation of the top surface of the piston type sand box of the previous section, and then starting to walk on the hanging basket;
s6, after the construction of the subsequent sections is finished, transferring the piston type sand box from the constructed end to the non-constructed end, repeating S3, and carrying out rail transportation and installation;
s7, repeating S5 and S6 until the suspension basket is completely suspended.
Further, the rate of lowering of the level of the cope box of the piston flask is previously determined by experiment before the step S1 is performed.
Further, in step S3, the specific operation of adjusting the height of the upper cover box is to open a valve to recover the refined sand by using the refined sand recovery device; and the upper cover box slowly descends to the calculated elevation and then the valve is closed.
Further, in step S3, the height of the cope box is adjusted as high as possible when the height of the cope box of the piston flask is adjusted for the first time.
Further, in S7, when the pistoning frame is found to be lower than the required height during walking, the cradle is lifted by the jack and then the pistoning frame is taken out and refilled with refined sand.
Compared with the prior art, the invention has the following advantages and beneficial effects: the traditional process is changed by using the piston type sand box, the problems that the heights of all main truss tracks are inconsistent and the like caused by longitudinal and transverse slopes of a bridge are solved, and the stability of the hanging basket track is improved. The problems that the leveling efficiency is low, the leveling structural strength cannot be guaranteed, the leveling cannot be accurately performed and the like in the traditional process can be solved. Meanwhile, the invention has the characteristics of high stability, repeated use, energy conservation, environmental protection, convenient storage and the like, has obvious economic benefit and has certain application and popularization values.
Drawings
FIG. 1 is a schematic top view of the present invention.
FIG. 2 is a schematic cross-sectional view taken along the line A-A in FIG. 1.
FIG. 3 is a schematic cross-sectional view taken along the line B-B in FIG. 1.
The explanation of each reference number in the figure is: a hanging basket rail-1; a lower steel plate-2; high-strength stud-3; an upper steel plate-4; a cushion layer-41; a fastening nut-5; leveling nuts-6; a piston type sand box-7; a lower box-71; a sand discharge nozzle-72; a valve-73; -upper lid box-74; and a timing sand stop pin-75.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so as to further understand the concept, the technical problems solved, the technical features constituting the technical solutions, and the technical effects brought by the technical solutions of the present invention; it is to be understood that the following text is merely illustrative of one or more specific embodiments of the invention and does not strictly limit the scope of the invention as specifically claimed.
As shown in fig. 1, the leveling device for the cantilever cast-in-situ hanging basket rail comprises a plurality of leveling units arranged along the length direction of the hanging basket rail 1, wherein each leveling unit comprises a supporting part and an adjusting part; the support part comprises a lower steel plate 2 arranged on the ground, a plurality of high-strength studs 3 are arranged on the lower steel plate 2, the top ends of the high-strength studs 3 penetrate through an upper steel plate 4, and leveling nuts 6 are arranged on the high-strength studs 3 on the lower surface of the upper steel plate 4;
as shown in fig. 2 and 3, the adjusting portion includes a piston type sand box 7 placed on the lower steel plate 2 and located in the middle of the high-strength stud 3, a sand discharge nozzle 72 penetrating through the side wall of the piston type sand box 7 is arranged at the bottom of the side wall of a lower box body 71 of the piston type sand box 7, a valve 73 is arranged on the sand discharge nozzle 72, the piston type sand box 7 further includes an upper cover box 74 sleeved above the lower box body 71, the upper surface of the upper cover box 74 is tightly pressed against the upper steel plate 4 through a cushion 41, and the adjusting portion further includes a fastening nut 5 arranged on the upper surface of the upper steel plate 4, and the fastening nut is arranged on the high-strength stud 3; the hanging basket track 1 is placed on the upper steel plate 4.
In the invention, the high-strength stud 3 and the lower steel plate 2 are both made of Q345 steel, the thickness of the lower steel plate is 15mm, the size of the lower steel plate is 80 x 35cm, the diameter of the high-strength stud 3 is 32mm, the width of a screw thread is 4-6 mm, the upper steel plate is made of Q345 steel, the thickness of the upper steel plate is 25mm, and the size of the upper steel plate is 80 x 35cm, and the upper steel plate is fixed by a fastening nut 5 and a leveling nut 6. The piston type sand box 7 is integrally composed of an upper cover box 74 and a lower box body 71, the depth difference of the two parts is 15cm, namely the maximum adjusting height of the device is 15cm, the piston type sand box 7 is also made of Q345 steel, the thickness of a panel of the upper cover box 74 is 15mm, the wall thickness is 8mm, and the thickness of a panel of the lower box body 71 is 8 mm.
As a preferred embodiment, the cushion layer 41 is a homogeneous steel plate, a Q345 steel plate with a thickness of 15mm is adopted, and during the hanging basket walking suspension casting process, the self weight of the upper hanging basket rail 1 and the load of the hanging basket are transmitted to the piston type sand box 7, so that the load is uniformly dispersed on the whole upper cover box 74, the pressure is reduced, the upper cover box 74 is uniformly stressed, the upper cover box 74 is prevented from deflecting, and the self-leveling of the refined sand in the piston type sand box 7 can be facilitated; the grain size of the refined sand is 1-5 mm, and the material is quartz sand with hard texture.
In a preferred embodiment, a timing sand stop pin 75 is provided at one end of the sand discharge nozzle 72 close to the piston type sand box 7. The timing sand stop pin 75 is a structure for realizing timing pressing down of a bolt by using a timer, and is in the prior art, so the structure is not described herein any more, the timing sand stop pin 75 has the function of representing the discharge amount of fine sand by timing, and after the specified time is reached, a matching device of the timer presses down the bolt at the sand discharge nozzle 72, so that sand is prevented from being left, and then the valve 73 is closed to ensure that the fine sand is completely sealed.
As a preferred embodiment, the sand-removing device also comprises a recovery box for recovering the refined sand; the refined sand inside the piston flask 7 is expensive and therefore needs to be recycled.
A leveling method of the cantilever cast-in-place hanging basket rail leveling device comprises the following steps:
s1, when a hanging basket is installed on a first section of a suspension casting beam, calculating the elevation of an upper steel plate 4 of a leveling unit under each track in advance according to longitudinal and transverse slopes;
s2, arranging a lower steel plate 2 and high-strength studs 3 in the length direction of a cradle track 1 according to a designed interval, wherein the axis of the lower steel plate 2 is overlapped with the axis of the cradle track 1, the designed net interval is generally not more than 0.5m, and front supports of the cradle are arranged side by side to provide sufficient and stable supporting force;
s3, placing the piston type sand box 7 on the axis of the lower steel plate 2 of each leveling unit, and adjusting the height of an upper cover box 74 of the piston type sand box 7 by using a sand discharge nozzle 72 and a valve 73; after the elevation adjustment of the upper cover box 74 of the piston type sand box 7 is consistent, the cushion layer 41 and the upper steel plate are accurately installed, and after the fastening nut 5 is screwed, the leveling nut 6 is screwed to complete the primary leveling;
s4, hoisting the hanging basket rail 1 to enable the hanging basket rail to be placed in the center at the axis of the upper steel plate 4, and installing the rest components of the hanging basket;
s5, after the suspension casting section is tensioned and has a hanging basket forward moving condition, arranging a piston type sand box 7 on the axis of the next section of track according to the steps S2 and S3, adjusting the elevation to be consistent with the elevation of the top surface of the piston type sand box 7 of the previous section, and then starting hanging basket walking;
s6, after the construction of the subsequent sections is finished, transferring the piston type sand box 7 from the constructed end to the non-constructed end, repeating the step S3, and carrying out rail transportation and installation;
s7, repeating S5 and S6 until the suspension basket is completely suspended.
The principle of the invention is as follows: the upper steel plate 74, the basket rail 1 and the basket are supported by the refined sand in the piston type sand box 7. When the height of each main truss track changes due to longitudinal and transverse slopes, refined sand in the piston type sand box 7 is discharged partially by the sand discharge nozzle 72, or the refined sand is discharged partially again after being refilled, the required supporting height is reached, the upper steel plate 4 is slowly lowered by rotating the leveling nut 6 until the upper steel plate completely falls on the cushion layer 41 on the piston type sand box 7, the fastening nut 5 is rotated downwards to abut against the upper surface of the upper steel plate 4 for limiting and fixing, then the leveling nut 6 is rotated reversely, the piston type sand box 7 and the cushion layer are assisted by the leveling nut 6 and the fastening nut 5 to share the subsequent construction load of the hanging basket track 1 and the hanging basket, so that the piston type sand boxes 7 with different heights can be used for supporting the hanging basket track 1, the height consistency of each main truss track is ensured, and the problems of deformation caused by uneven stress of the track are avoided.
As a preferred embodiment, the rate of lowering of the elevation of the cope box 74 of the piston flask 7 is determined in advance by experiment before the step S1 is performed; the height of the upper cover box 74 can be measured manually, by laser, etc., in this embodiment, the height change rate of the upper cover box 74 is measured in advance, and the amount of the released refined sand is ensured by the timing sand stop pin 75, so as to achieve the purpose of accurately controlling the height of the piston type sand box 7.
As a preferred embodiment, in step S3, the specific operation of adjusting the height of the upper cover box 74 is to open the valve 73 and recover the refined sand by using the refined sand recovery device; the upper lid box 74 is slowly lowered to the calculated elevation and the valve 73 is closed.
As a preferred embodiment, in step S3, the height of the upper cover box 74 is adjusted as high as possible when the height of the upper cover box 74 of the piston flask 7 is adjusted for the first time; because the height of the whole hanging basket track needs to be kept constant and the height of the ground from the main truss track is usually high or low, when the upper cover box 74 is used for adjusting the height for the first time, the height of the upper cover box 74 needs to be adjusted to the greatest extent, and the interior of the sand box can be provided with enough refined sand when the piston type sand box 7 at the constructed end is moved to the next section in the later period.
As a preferred embodiment, in step S7, when the height of the piston flask 7 is found to be lower than the required height during walking, the hanging basket is jacked up by the jack, the piston flask 7 is taken out and refilled with refined sand; when the amount of the refined sand of the piston type sand box 7 is not enough to support the upper cover box 74 to reach the set height in the using process, the jack is used for temporarily replacing the piston type sand box 7, and the sand box is moved out and refilled and then is released again to meet the elevation requirement.
Compared with the existing high-strength mortar leveling method, the device does not need to vertically mould and pour high-strength mortar at the designed position, saves a large amount of time required by the high-strength mortar curing process, and simultaneously avoids the problems of insufficient mortar strength, small mortar thickness and improper mortar curing caused by the problems of mortar curing and the like, thereby further influencing the integrity of a mortar cushion layer under a track and avoiding the situation of reduced stability of hanging basket installation caused by settlement or deviation. Compared with the existing profile steel pad beam leveling method, the purpose that the height is gradually changed only by filling the thin steel plate in the gap between the pad beam and the bottom of the track when the height of the bridge changes along with the longitudinal slope and the cross slope is avoided, the problems that the track is deformed and the flange of the profile steel is pressed to be deformed too much due to the fact that the gasket is not filled are avoided, the profile steel used as the gasket can be saved, the construction cost is saved, the construction progress can be greatly accelerated, the construction period is shortened, and the profile steel pad beam leveling method has great economic benefits.
The terms "connected" and "fixed" in the description of the present invention may be fixed, formed, welded, or mechanically connected, and the specific meaning of the above terms in the present invention is understood.
In the description of the present invention, the terms "center", "upper", "lower", "horizontal", "inner", "outer", etc. are used in the orientation or positional relationship indicated only for convenience in describing the present invention and for simplicity in description, but do not indicate or imply that the device or element referred to must have a particular orientation and therefore should not be construed as limiting the present invention.
The foregoing detailed description and drawings are merely representative of the presently preferred embodiments of the invention. It will be apparent that various additions, modifications and substitutions are possible without departing from the spirit and scope of the invention as defined in the accompanying claims. It will be appreciated by those skilled in the art that the present invention may be varied in form, structure, arrangement, proportions, materials, elements, components and otherwise, used in the practice of the invention, depending upon specific environments and operating requirements, without departing from the principles of the present invention. Accordingly, the presently disclosed embodiments are meant to be illustrative only and not limiting, the scope of the invention being indicated by the appended claims and their legal equivalents, rather than by the foregoing description.
Claims (9)
1. A cantilever cast-in-situ hanging basket rail leveling device comprises a plurality of leveling units arranged along the length direction of a hanging basket rail (1), wherein each leveling unit comprises a supporting part and an adjusting part; the support part is characterized by comprising a lower steel plate (2) arranged on the ground, wherein a plurality of high-strength studs (3) are arranged on the lower steel plate (2), the top ends of the high-strength studs (3) penetrate through an upper steel plate (4), and leveling nuts (6) are arranged on the high-strength studs (3) on the lower surface of the upper steel plate (4);
the adjusting part comprises a piston type sand box (7) placed on the lower steel plate (2) and is positioned in the middle of the high-strength stud (3); a sand discharge nozzle (72) penetrating through the side wall of the piston type sand box (7) is arranged at the bottom of the side wall of the lower box body (71) of the piston type sand box (7), a valve (73) is arranged on the sand discharge nozzle (72), the piston type sand box (7) further comprises an upper cover box (74) sleeved above the lower box body (71), and the upper surface of the upper cover box (74) is tightly abutted against the upper steel plate (4) through a cushion layer (41); the steel plate is characterized by also comprising a fastening nut (5) arranged on the high-strength stud (3) on the upper surface of the upper steel plate (4);
the hanging basket rail (1) is placed on the upper steel plate (4).
2. The device for leveling the track of the cantilever cast-in-place pannier according to claim 1, wherein the cushion layer (41) is a homogeneous steel plate.
3. The track leveling device for the cantilever cast-in-place hang basket according to claim 1, wherein the sand discharge nozzle (72) is provided with a timing sand stop pin (75) at one end close to the piston type sand box (7).
4. The leveling device for the track of the cantilever cast-in-place hanging basket according to claim 1, further comprising a recovery box for recovering refined sand.
5. The leveling method of the cantilever cast-in-place hanging basket rail leveling device as claimed in any one of claims 1 to 4, comprising the following steps:
s1, when a hanging basket is installed on a first section of a suspension casting beam, calculating the elevation of an upper steel plate (4) of a leveling unit under each track according to longitudinal and transverse slopes in advance;
s2, arranging the lower steel plate (2) and the high-strength studs (3) in the length direction of the hanging basket rail (1) according to a design interval, wherein the axis of the lower steel plate (2) is overlapped with the axis of the hanging basket rail (1);
s3, placing the piston type sand box (7) on the axis of the lower steel plate (2) of each leveling unit, and adjusting the height of an upper cover box (74) of the piston type sand box (7) by using a sand release nozzle (72) and a valve (73); after the elevation adjustment of an upper cover box (74) of the piston type sand box (7) is consistent, a cushion layer (41) and an upper steel plate are accurately installed, and a leveling nut (6) is screwed after a fastening nut (5) is screwed to finish primary leveling;
s4, hoisting the hanging basket rail (1), placing the hanging basket rail in the center of the axis of the upper steel plate (4), and installing the rest components of the hanging basket;
s5, after the suspension casting section is tensioned and has a hanging basket forward moving condition, arranging a piston type sand box (7) on the axis of the next section of track according to the steps S2 and S3, adjusting the elevation to be consistent with the elevation of the top surface of the piston type sand box (7) of the previous section, and then starting the hanging basket to travel;
s6, after the construction of the subsequent sections is finished, transferring the piston type sand box (7) from the constructed end to the non-constructed end, repeating S3, and carrying out rail transportation and installation;
s7, repeating S5 and S6 until the suspension basket is completely suspended.
6. The method for leveling a leveling device of a cantilever cast-in-place basket rail according to claim 5, wherein the rate of lowering of the elevation of the cope box (74) of the drag flask (7) is previously determined by experiment before performing step S1.
7. The leveling method of the cantilever cast-in-place basket rail leveling device according to claim 5, wherein in step S3, the specific operation of adjusting the height of the upper cover box (74) is to open the valve (73) and recover the refined sand by using a refined sand recovery device; the upper cover box (74) is slowly descended to the calculated elevation and then the valve (73) is closed.
8. The method for leveling the leveling device of the cantilever cast-in-place basket rail according to claim 5, wherein in step S3, the height of the upper cover box (74) of the piston sand box (7) is adjusted as high as possible when the height of the upper cover box (74) is adjusted for the first time.
9. The method for leveling the track leveling device of the cantilever cast-in-place pannier rail according to claim 5, wherein in step S7, when the height of the drag flask (7) is found to be lower than the required height during walking, the drag flask (7) is taken out after the jack is used to jack the pannier and the pannier is refilled with the refined sand.
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| CN202111271751.3A CN113931082A (en) | 2021-10-29 | 2021-10-29 | Cantilever cast-in-place hanging basket rail leveling device and leveling method thereof |
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| CN202111271751.3A CN113931082A (en) | 2021-10-29 | 2021-10-29 | Cantilever cast-in-place hanging basket rail leveling device and leveling method thereof |
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