CN114135326A - Construction method and construction device for jacking box culvert - Google Patents
Construction method and construction device for jacking box culvert Download PDFInfo
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- CN114135326A CN114135326A CN202111647386.1A CN202111647386A CN114135326A CN 114135326 A CN114135326 A CN 114135326A CN 202111647386 A CN202111647386 A CN 202111647386A CN 114135326 A CN114135326 A CN 114135326A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
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- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
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Abstract
The invention relates to a construction method and a construction device for jacking a box culvert, which comprise an angle-adjustable bow slope arranged at the front end of the box culvert and an adjustable pulley arranged between the top of the box culvert and an original line head-raising beam, wherein a jack of the angle-adjustable bow slope, a steel bow slope and the front end of the box culvert form a triangular structure, the bottom surface of the mounted steel bow slope upwards inclines to form an inclination angle with a horizontal plane, and a hydraulic synchronous control system controls the jack to eject or withdraw to change the inclination angle of the steel bow slope. The adjustable pulley comprises a vertical jack and a pulley fixed above the vertical jack, a pulley of the pulley is in contact with the transverse lifting beam, and the hydraulic synchronous control system changes the height of the adjustable pulley by controlling the action of the vertical jack. The invention can not only automatically adjust the ship bow slope to prevent the phenomenon of head pricking or head raising when the box culvert is jacked in, but also protect the box culvert top from damaging the original line, and has double functions and functions.
Description
Technical Field
The invention relates to the technical field of box culvert jacking construction, in particular to a box culvert jacking construction method and a box culvert jacking construction device.
Background
In the municipal construction process, when a newly-built road needs to pass through the original railway and road subgrade, the box culvert jacking construction technology can be adopted to construct a new line after necessary reinforcement measures are taken for the original line.
The box culvert is a three-dimensional box-shaped structure with a rectangular cross section and made of reinforced concrete, and the inner culvert provides a space for forward excavation construction. The box culvert jacking construction method is a construction method for jacking and downwards penetrating a prefabricated box culvert through an overhead original line by adopting power equipment. The box culvert jacking method is widely applied because of reducing the interference to the original line traffic.
As shown in fig. 1, when the box culvert is jacked, a working pit is firstly dug at one side of the original line, and the working pit is protected; then pouring a sliding plate in the working pit; then pouring a reinforced concrete box culvert on the sliding plate in situ; when the concrete strength of the box culvert is maintained until the concrete strength meets the design requirement, jacking power equipment, a force transmission device and a back counterforce wall are adopted to jack the box culvert forwards in the length direction step by step, and each time a section of earthwork is excavated forwards from the interior of the box culvert manually or mechanically, the box culvert is jacked forwards further and is circularly reciprocated until the box culvert is jacked in place; according to the width of the original line, a plurality of box culverts can be connected and jacked to form an underground passage.
In the box culvert jacking process, the head lowering phenomenon is usually caused by the acting force of a foundation and a front soil body or the weight of a bottom plate of the box culvert and the like, and the head lowering phenomenon is commonly called as head binding, so that the engineering quality is influenced. In order to prevent the box culvert from being pricked, a certain upward slope is reserved below the bottom plate at the front end of the box culvert, generally called as a bow slope, or the bow slope made of steel is installed below the bottom plate at the front end of the box culvert. However, the inclination angle in front of the bow slope in the two modes is fixed and cannot be adjusted. In the box culvert jacking process, the field conditions are complex and changeable, for example, the inclination angle of a ship bow slope is too small and the phenomenon of head binding still occurs in a line with a softer stratum; for example, the accuracy is not enough in the process of manufacturing or installing a steel bow slope, the angle error is too large, and the design requirement can be met after adjustment is needed; for example, after the box culvert jacking is finished at each step, the postures of the box culverts are different, and the inclination angle of the steel bow slope needs to be adjusted again according to the actual condition. Therefore, the steel bow slope with the adjustable angle can better meet the construction requirement.
Chinese patent with application number CN201810137973.8 discloses an angle-adjustable 'bow slope', the steel truss and the steel bottom plate of the steel bow slope are welded together, the fixed hinge is a fixed node under the steel 'bow slope', the vertically arranged jack is installed on the box culvert bottom plate, and the force transmission mandril is located between the jack and the steel truss. In the jacking process of the box culvert, the fixed hinge bolt is locked, the jack is jacked up with the steel truss through the force transmission ejector rod, the reaction force of the soil body to the steel bottom plate is transmitted to the front edge of the box culvert bottom plate through the steel truss and the force transmission ejector rod, head raising torque is generated, and the box culvert is prevented from being pricked and raised. When the inclination angle of the steel bow slope needs to be adjusted, the bolt of the fixed hinge is loosened, the space posture of the welded steel frame is controlled by controlling the jacking or falling of the jack, and the purpose of adjusting the angle is achieved. From the description and the drawings of the patent, when the inclination angle of the bow slope is adjusted, after the bolt for fixing the hinge is loosened, the steel truss and the steel bottom plate are integrally loosened, the jack and the force transmission ejector rod do not have supporting and controlling effects on the steel truss and the steel bottom plate in the non-jacking process (figure 1), the bolt for fixing the hinge is locked after the truss is supported and adjusted to a required angle by manpower or other methods, and the jack is jacked on the steel truss through the force transmission ejector rod in the jacking process of the box culvert (figure 2). In the angle adjusting process, the steel truss and the steel bottom plate need to be supported and rotated by manpower or other facilities in an auxiliary mode, bolts for fixing the hinges need to be screwed simultaneously, two operations of loosening and screwing are conducted, the number of processes is large, manual labor is large, the auxiliary support is needed, time and labor are wasted, and the operation difficulty is large. Secondly, the position of the steel truss and the position of the steel bottom plate are difficult to accurately position by the adjusting mode, and the precision of the adjusted angle is difficult to ensure. In addition, the angle-adjustable 'bow slope' is installed below the box culvert bottom plate and occupies a certain space, the thickness of the front end of the box culvert bottom plate is reduced, the box culvert bears large jacking force, the angle-adjustable device is dismantled and the bottom plate is repaired after the box culvert is jacked in place, and the construction workload is increased.
Disclosure of Invention
Aiming at the defects or shortcomings of the prior art, the invention aims to provide a box culvert jacking construction method and a box culvert jacking construction device, which can automatically adjust the angle of a steel bow slope, are simple to operate, save time and labor and have high adjustment precision.
In order to solve the above technical problems, the present invention has the following configurations:
a box culvert jacking construction method comprises the following steps:
s1: installing a plurality of groups of connecting pieces of the ship bow slopes with adjustable angles, installing the plurality of groups of connecting pieces at intervals in the width direction of the cross section of the box culvert, wherein each group of connecting pieces comprises one connecting piece fixed at the front end of the box culvert and one connecting piece fixed at the front end of the bottom plate of the box culvert right below the connecting piece;
s2: the steel bow slope and a plurality of jacks of the angle-adjustable bow slope are mounted at the front end of the box culvert, the number of the jacks is equal to that of the connecting piece groups, the width of the steel bow slope is determined according to the width size of the cross section of the box culvert, in the jacking direction, the root of the steel bow slope is rotatably connected with the lower connecting piece of each group of connecting pieces, the front end of the steel bow slope is rotatably connected with the lower end of the jack, the jacks are obliquely arranged, the upper ends of the jacks are rotatably connected with the upper connecting pieces of each group of connecting pieces, the jacks, the steel bow slope and the front end of the box culvert form a triangular structure, the bottom surface of the steel bow slope mounted on the box culvert is upwards inclined, and an inclination angle is formed between the bottom surface of the steel bow slope and the horizontal plane;
s3: connecting the jacks with a hydraulic synchronous control system, and connecting a plurality of jacks on the bow slope with adjustable angles with the hydraulic synchronous control system;
s4: the angle of inclination of the adjustable angle bow slope is adjusted automatically, the hydraulic synchronous control system calculates the variable quantity of the length of the jack ejector rod according to the magnitude of the foundation reaction force, the jack ejector rod is controlled to be pushed out or retracted, the jack pulls up or puts down the front end of the steel bow slope, the front end of the steel bow slope rotates around a connecting piece of the root, and the angle of inclination of the bottom of the steel bow slope is controlled accurately to reach a target angle.
The construction method for jacking the box culvert further comprises the following steps: s5: installing an adjustable pulley, installing a plurality of vertical jacks of the adjustable pulley on the top surface of the box culvert, installing the pulley on the vertical jacks, enabling pulleys of the pulley to face to an upper transverse lifting beam, determining the distance and the number of the vertical jacks according to the length of the pulley, installing a stop block on the top of the box culvert, wherein the height of the stop block is larger than that of the pulley, and the stop block is positioned on the front side of the pulley in the jacking direction of the box culvert so as to prevent the pulley from moving forwards;
s6: the vertical jack is connected with the hydraulic synchronous control system, the vertical jack of the adjustable pulley is connected with the hydraulic synchronous control system, the hydraulic synchronous control system controls the ejector rod of the vertical jack to be pushed out and retracted, and the height of the adjustable pulley is adjusted.
In step S2, the rotatable connection is made by forming a hole in the connected member itself or the structure to which the connected member is welded, and the rotating shaft is inserted through the hole of the connected member and axially fixed, thereby realizing the hinge connection between the connected members.
The steel bow slope comprises a steel structure support and a steel plate fixed below the support, the steel plate is longer than the steel structure support in the advancing direction, and the steel plate extends to the position below the box culvert bottom plate to shield a gap between the box culvert bottom plate and the steel structure support.
The utility model provides a construction equipment that box culvert advances that pushes up, including adjustable angle bow slope, adjustable angle bow slope is installed in the box culvert front end, including the steel bow slope, a plurality of jacks and the multiunit connecting piece of connecting steel bow slope and box culvert, the quantity of jack is the same with the group number of connecting piece, install multiunit connecting piece in the cross section width direction of box culvert with the interval, every group connecting piece contains a connecting piece of fixing at the box culvert front end and the connecting piece of fixing at box culvert bottom plate front end under with, the width of steel bow slope is confirmed according to the width size of the cross section of box culvert, in the direction of advancing, rotatable coupling between the root of steel bow slope and the below connecting piece of every group connecting piece, the front end and the jack lower extreme rotatable coupling of steel bow slope, the jack slope is arranged, the jack upper end and the top connecting piece rotatable coupling of every group connecting piece, the jack, The steel bow slope and the front end of the box culvert form a triangular structure, the bottom surface of the steel bow slope arranged on the box culvert is upwards inclined, and an inclination angle is formed between the bottom surface of the steel bow slope and the horizontal plane;
the jack is a hydraulic jack and is connected with a hydraulic synchronous control system for controlling the box culvert pushing system, and the hydraulic synchronous control system automatically adjusts the inclination angle of the steel bow slope according to the magnitude of the foundation reaction force in the pushing process.
Construction equipment that box culvert top advanced, still including setting up the adjustable coaster between box culvert top and original circuit horizontal lifting beam, the vertical installation at the box culvert top surface of a plurality of vertical jack of adjustable coaster, install the coaster on the vertical jack, the pulley of coaster is towards the horizontal lifting beam of top, the interval and the quantity of vertical jack are confirmed according to coaster length, the dog is installed at the box culvert top, be located the front side of coaster on the box culvert top advancing direction, the dog height is greater than the coaster, in order to block the coaster antedisplacement, the vertical jack of adjustable coaster is hydraulic jack, link to each other with hydraulic pressure synchronous control system, hydraulic pressure synchronous control system control vertical jack ejector pin is released and is withdrawed, in order to adjust the height of adjustable coaster.
The rotatable connection is characterized in that a hole is formed in the connected piece body or the welded structure of the connected piece, and the rotating shaft penetrates through the hole of the connected piece and is axially fixed, so that the connected pieces are hinged.
The connecting piece is installed on the box culvert in a pre-buried or chemical anchor bolt mode.
The steel bow slope comprises steel structure support and the steel sheet of fixing in the support below, and the steel sheet is longer than steel structure support in the advancing direction, and the steel sheet extends to box culvert bottom plate below to shelter from the gap between box culvert bottom plate and the steel structure support.
The steel structure support is formed by welding H-shaped steel.
Compared with the prior art, the invention has the advantages that:
the construction method and the construction device for box culvert jacking can automatically adjust the slope of the bow slope in time according to the actual situation on site; the manual operation is not needed, and the time and the labor are saved; and the adjustment precision of the inclination angle of the steel bow slope is higher.
Secondly, the scheme of the invention can not only automatically adjust the slope of the ship bow slope to prevent the phenomenon of tying or raising when the box culvert is jacked in, but also protect the cross-lifting beam of the original line on the upper part from being damaged when the box culvert is tied or raised, thereby having double functions and functions.
Moreover, the angle-adjustable steel bow slope is arranged on the front side of the box culvert bottom plate, the structure and the strength of the box culvert body are not influenced, the box culvert can be directly dismantled after being moved in place, and the subsequent workload does not need to be increased; the adjustable trolley also has the same advantages.
Drawings
FIG. 1: schematic diagram of box culvert jacking construction technology;
FIG. 2: a front view of an embodiment of the present invention;
FIG. 3: top view of an embodiment of the present invention.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
The construction apparatus for box culvert jacking of the present invention, as shown in fig. 2, includes an angle-adjustable bow slope 100.
The angle-adjustable bow slope 100 is installed at the front end of the box culvert and comprises a steel bow slope 110, a plurality of jacks 120 and a plurality of groups of connecting pieces 130 for connecting the steel bow slope 110 and the box culvert.
Each set of connecting members 130 comprises a connecting member 130 fixed to a riser at the front end of the box culvert and a connecting member 130 fixed to the front end of the bottom plate of the box culvert just below the connecting member 130. The connecting member 130 is preferably installed by means of pre-cast or chemical anchors.
Referring to fig. 2, in the jacking direction, the root of the steel bow slope 110 is rotatably connected with the lower connecting piece 130 of each group of connecting pieces 130, the front end of the steel bow slope 110 is rotatably connected with the lower end of the jack 120, the jack 120 is obliquely arranged, the upper end of the jack 120 is rotatably connected with the upper connecting piece 130 of each group of connecting pieces 130, the jack 120, the steel bow slope 110 and the front end of the box culvert form a triangular structure, the triangular structure enables the steel bow slope 110 to bear the foundation reaction force with higher strength, and the structure of the whole angle-adjustable bow slope 100 is more stable. The bottom surface of a steel bow slope 110 installed on the box culvert is inclined upwards to form an inclination angle a with the horizontal plane.
As shown in fig. 3, the width of the steel bow slope 110 is determined according to the width dimension of the cross section of the box culvert, a plurality of sets of connecting members 130 and the same number of jacks 120 are installed at intervals in the width direction of the cross section of the box culvert, and three sets of connecting members 130 and three jacks 120 are installed in the embodiment shown in fig. 3.
The above-mentioned rotatable connection among the steel bow slope 110, the jack 120 and the connecting member 130 is preferably implemented by forming a hole on the body of the connected member or a welded structure on the connected member, and axially fixing the rotating shaft through the hole of the connected member to realize the hinge connection between the connected members. As other embodiments, other hinge structures may be used as long as relative rotation between the connected members is ensured.
The steel bow slope 110 is composed of a steel structure support 111 and a steel plate 112 fixed below the support, the steel plate 112 is longer than the steel structure support 111 in the advancing direction, the steel plate 112 extends to the lower side of the box culvert bottom plate to block a gap between the box culvert bottom plate and the steel structure support 111, and a soil layer is prevented from entering the gap when the box culvert is jacked.
Fig. 2 and 3 show the same embodiment, in which the steel structure support 111 is preferably formed by welding H-shaped steel, specifically, three short-shaped steel are arranged in parallel, two rows of long-shaped steel are connected between the short-shaped steel, a plurality of reinforcing ribs are further arranged between the two rows of long-shaped steel, the steel structure support 111 is formed by welding the steel sections, and a steel plate 112 is fixed below the steel structure support 111.
The jacks 120 of the adjustable angle bow ramp 100 are preferably hydraulic jacks and are connected to a hydraulic synchronization control system. The hydraulic synchronous control system is simultaneously connected with a pushing system for pushing construction.
In the box culvert jacking process, the bottom surface of the angle-adjustable bow slope 100 has thrust to the foundation and simultaneously receives the counterforce of the foundation, and the inclination angle a of the steel bow slope 110 is automatically adjusted through a hydraulic synchronous control system according to the magnitude of the counterforce of the foundation. Specifically, the jack 120 of the angle-adjustable bow-shaped slope 100 is controlled by the hydraulic synchronous control system to push out or retract, and the jack 120 pulls up or puts down the front end of the steel bow-shaped slope 110, so that the front end of the steel bow-shaped slope 110 rotates around the connecting piece 130 at the root part, the inclination angle a of the steel bow-shaped slope 110 is changed, and the phenomenon of head pricking or head raising of the box culvert is prevented. Moreover, the hydraulic synchronous control system can calculate and control the variation of the length of the top rod of the jack 120 according to the size of each part of the angle-adjustable bow slope 100, so as to accurately achieve the target angle of the steel bow slope 110 to be adjusted.
As can be seen from the above, the inclination angle a of the adjustable-angle bow slope 100 is automatically adjusted according to the magnitude of the foundation reaction force, and can respond in time according to the actual conditions of the soil layer, and the adjustment action is very simple. Meanwhile, it is possible to ensure accurate control of the inclination angle a of the steel bow slope 110.
Construction equipment that box culvert top advanced, still including setting up the adjustable coaster 200 between box culvert top and original circuit cross-lift roof beam, vertical the installing at the box culvert top surface of a plurality of vertical jack 210 of adjustable coaster 200, install coaster 220 on vertical jack 210, the pulley of coaster 220 is towards the cross-lift roof beam of top, vertical jack 210's interval and quantity are confirmed according to coaster 220 length, dog 230 is installed at the box culvert top, be located the front side of coaster 220 on the box culvert top advancing direction, dog 230 highly is greater than coaster 220, in order to block the antedisplacement of coaster 220.
The vertical jack 210 of the adjustable pulley 200 is preferably a hydraulic jack and is connected with a hydraulic synchronous control system, and the hydraulic synchronous control system controls the push rod of the vertical jack 210 to be pushed out and retracted so as to adjust the height of the adjustable pulley 200 to meet the field requirement.
As in the embodiment of fig. 2, two vertical jacks 210 are preferably used below the trolley 220.
The adjustable pulley 200 can avoid the adverse effect of the change of the position of the upper surface of the box culvert on the original line at the upper part if the box culvert is pricked or raised.
The construction method for jacking the box culvert is realized by the following steps:
s1: a plurality of sets of connectors 130 for the adjustable angle bow ramp 100 are installed. A plurality of groups of connecting pieces 130 are arranged at intervals in the width direction of the cross section of the box culvert, and each group of connecting pieces 130 comprises one connecting piece 130 fixed on a vertical plate at the front end of the box culvert and one connecting piece 130 fixed at the front end of the bottom plate of the box culvert right below the connecting piece 130.
S2: the steel bow slope 110 of the angle-adjustable bow slope 100 and a plurality of jacks 120 are installed at the front end of the box culvert. The number of the jacks 120 is equal to that of the groups of the connecting pieces 130, the width of the steel bow slope 110 is determined according to the width size of the cross section of the box culvert, in the jacking direction, the root of the steel bow slope 110 is rotatably connected with the connecting pieces 130 below each group of the connecting pieces 130, the front end of the steel bow slope 110 is rotatably connected with the lower end of the jack 120, the jacks 120 are obliquely arranged, the upper ends of the jacks 120 are rotatably connected with the connecting pieces 130 above each group of the connecting pieces 130, the jacks 120, the steel bow slope 110 and the front end of the box culvert form a triangular structure, the bottom surface of the steel bow slope 110 arranged on the box culvert is upwards inclined, and an inclination angle a is formed between the jacks and the horizontal plane.
S3: a plurality of jacks 120 connected to the adjustable angle bow ramp 100 are synchronized with the hydraulic synchronization control system. Each jack 120 is connected with a hydraulic synchronous control system, and the hydraulic synchronous control system simultaneously controls a pushing system for box culvert jacking construction.
S4: the inclination angle a of the steel bow slope 110 is automatically adjusted. The hydraulic synchronous control system calculates the variation of the lengths of the ejector rods of the jacks 120 according to the magnitude of the foundation reaction force and the sizes of all parts of the angle-adjustable bow slope 100, controls the ejector rods of the jacks 120 to be pushed out or retracted, and the jacks 120 pull up or put down the front end of the steel bow slope 110 to enable the front end of the steel bow slope 110 to rotate around the connecting piece 130 at the root part, so that the inclination angle a at the bottom of the steel bow slope 110 is accurately controlled to reach a target angle.
The construction method for jacking the box culvert further comprises the following steps:
s5: the adjustable sled 200 is installed. A plurality of vertical jacks 210 of the adjustable pulley 200 are arranged on the top surface of the box culvert, a pulley 220 is arranged on each vertical jack 210, a pulley of the pulley 220 is towards a cross-lifting beam above, the distance and the number of the vertical jacks 210 are determined according to the length of the pulley 220, a stop block 230 is arranged on the top of the box culvert, the stop block 230 is positioned on the front side of the pulley 220 in the jacking direction of the box culvert, and the height of the stop block 230 is larger than that of the pulley 220 so as to stop the forward movement of the pulley 220.
S6: the adjustable trolley 200 and the hydraulic synchronous control system are connected. The vertical jack 210 of the adjustable pulley 200 is connected with a hydraulic synchronous control system, the hydraulic synchronous control system controls the push rod of the vertical jack 210 to be pushed out and retracted, and the height of the adjustable pulley 200 is adjusted to adapt to the field requirement.
Specifically, in S1, the connecting member 130 may be installed by means of pre-embedded or chemical anchors.
The rotatable connection described in S2 is preferably formed by forming a hole in the connected member itself or a structure to which the connected member is welded, and the rotating shaft is inserted through the hole in the connected member and axially fixed, thereby achieving the hinge joint between the connected members.
In S2, the steel bow slope 110 comprises a steel structure support 111 and a steel plate 112 fixed below the support, the steel plate 112 is longer than the steel structure support 111 in the advancing direction, the steel plate 112 extends to the lower side of the box culvert bottom plate to shield the gap between the box culvert bottom plate and the steel structure support 111, and the soil layer is prevented from entering the gap when the box culvert is jacked.
The steel structure support 111 in the steps of the method is preferably formed by welding H-shaped steel, specifically, a plurality of short-shaped steel are arranged in parallel, the short-shaped steel are connected by a plurality of rows of long-shaped steel, a plurality of reinforcing ribs are arranged between the plurality of rows of long-shaped steel, the steel structure support 111 is formed by welding the steel sections, and a steel plate 112 is fixed below the steel structure support 11 l.
Compared with the steel bow slope with adjustable angle in the prior art, the construction method and the construction device for box culvert jacking have the following advantages that: the slope of the bow slope can be timely and automatically adjusted according to the actual situation on site; the manual operation is not needed, and the time and the labor are saved; and the adjustment precision of the inclination angle of the steel bow slope is higher.
Besides, the method and the device can automatically adjust the slope of the bow slope to prevent the phenomenon of head pricking or head raising when the box culvert is jacked in, can protect the transverse lifting beam of the original line on the upper part from being damaged when the box culvert is pricked or head raised, and have double functions and functions.
Moreover, the angle-adjustable steel bow slope is arranged on the front side of the box culvert bottom plate, the structure and the strength of the box culvert body are not influenced, the box culvert can be directly dismantled after being moved in place, and the subsequent workload does not need to be increased; the adjustable trolley also has the same advantages.
The above embodiments are merely illustrative of the present invention and are not to be construed as limiting the invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications or equivalent substitutions may be made in the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and the technical solution of the present invention should be covered in the scope of the claims of the present invention.
Claims (10)
1. The construction method for jacking the box culvert is characterized by comprising the following steps of:
s1: a plurality of groups of connecting pieces (130) of the ship bow slope (100) with adjustable angles are installed; a plurality of groups of connecting pieces (130) are arranged at intervals in the width direction of the cross section of the box culvert, and each group of connecting pieces (130) comprises one connecting piece (130) fixed at the front end of the box culvert and the connecting piece (130) fixed at the front end of the bottom plate of the box culvert right below the connecting piece (130);
s2: a steel bow slope (110) of the angle-adjustable bow slope (100) and a plurality of jacks (120) are arranged at the front end of the box culvert; the number of the jacks (120) is equal to that of the groups of the connecting pieces (130), the width of the steel bow slope (110) is determined according to the width size of the cross section of the box culvert, in the jacking direction, the root of the steel bow slope (110) is rotatably connected with the connecting pieces (130) below each group of the connecting pieces (130), the front end of the steel bow slope (110) is rotatably connected with the lower ends of the jacks (120), the jacks (120) are obliquely arranged, the upper ends of the jacks (120) are rotatably connected with the connecting pieces (130) above each group of the connecting pieces (130), the jacks (120), the steel bow slope (110) and the box culvert form a triangular structure, the bottom surfaces of the steel bow slopes (110) arranged on the box culvert are upwards inclined, and an inclination angle (a) is formed between the jacks (120), the steel bow slope (110) and the horizontal plane;
s3: connecting the jack (120) with a hydraulic synchronous control system; connecting a plurality of jacks (120) of the adjustable angle bow ramp (100) to the hydraulic synchronous control system;
s4: automatically adjusting the inclination angle (a) of the adjustable angle bow ramp (100); the hydraulic synchronous control system calculates the variation of the length of the ejector rod of the jack (120) according to the magnitude of the foundation reaction force, controls the ejector rod of the jack (120) to be pushed out or withdrawn, and the jack (120) pulls up or puts down the front end of the steel bow slope (110), so that the front end of the steel bow slope (110) rotates around the connecting piece (130) at the root part, and the inclination angle (a) at the bottom of the steel bow slope (110) is accurately controlled to reach a target angle.
2. The box culvert jacking construction method according to claim 1, further comprising the steps of:
s5: installing an adjustable pulley (200), installing a plurality of vertical jacks (210) of the adjustable pulley (200) on the top surface of the box culvert, installing pulleys (220) on the vertical jacks (210), wherein pulleys of the pulleys (220) face upwards to form a cross beam, the distance and the number of the vertical jacks (210) are determined according to the length of the pulleys (220), installing a stop block (230) on the top of the box culvert, wherein the height of the stop block (230) is higher than that of the pulleys (220), and the stop block (230) is positioned on the front side of the pulleys (220) in the jacking direction of the box culvert and stops the pulleys (220) from moving forwards;
s6: the vertical jack (210) is connected with the hydraulic synchronous control system, the vertical jack (210) of the adjustable pulley (200) is connected with the hydraulic synchronous control system, the hydraulic synchronous control system controls the ejector rod of the vertical jack (210) to be pushed out and retracted, and the height of the adjustable pulley (200) is adjusted.
3. The box culvert jacking construction method according to claim 1, wherein in step S2, the rotatable connection is formed by forming holes in the connected pieces themselves or the structures welded by the connected pieces, and the rotating shaft penetrates through the holes of the connected pieces and is axially fixed, so as to realize the hinge connection between the connected pieces.
4. The box culvert jacking construction method according to claim 1, wherein the steel bow slope (110) comprises steel structure brackets (111) and steel plates (112) fixed below the brackets, the steel plates (112) are longer than the steel structure brackets (111) in the advancing direction, and the steel plates (112) extend below a box culvert bottom plate to block gaps between the box culvert bottom plate and the steel structure brackets (111).
5. The box culvert jacking construction device is characterized by comprising an angle-adjustable bow slope (100), wherein the angle-adjustable bow slope (100) is arranged at the front end of a box culvert and comprises a steel bow slope (110), a plurality of jacks (120) and a plurality of groups of connecting pieces (130) for connecting the steel bow slope (110) and the box culvert, the number of the jacks (120) is the same as that of the connecting pieces (130), a plurality of groups of connecting pieces (130) are arranged at intervals in the width direction of the cross section of the box culvert, each group of connecting pieces (130) comprises one connecting piece (130) fixed at the front end of the box culvert and the connecting pieces (130) fixed at the front end of a bottom plate of the box culvert right below the connecting pieces (130), the width of the steel bow slope (110) is determined according to the width size of the cross section of the box culvert, and the root of the steel bow slope (110) is rotatably connected with the connecting pieces (130) below each group of the connecting pieces (130) in the jacking direction, the front end of the steel bow slope (110) is rotatably connected with the lower end of the jack (120), the jacks (120) are arranged in an inclined mode, the upper end of each jack (120) is rotatably connected with the connecting piece (130) above each group of connecting pieces (130), the jacks (120), the steel bow slope (110) and the front end of the box culvert form a triangular structure, the bottom surface of the steel bow slope (110) installed on the box culvert inclines upwards, and an inclination angle (a) is formed between the bottom surface of the steel bow slope (110) and the horizontal plane;
the jack (120) is a hydraulic jack and is connected with a hydraulic synchronous control system for controlling the box culvert pushing system, and the hydraulic synchronous control system automatically adjusts the inclination angle (a) of the steel bow slope (110) according to the magnitude of the foundation reaction force in the pushing process.
6. The box culvert jacking construction device according to claim 5, further comprising an adjustable trolley (200) arranged between the top of the box culvert and the cross beam of the original line, wherein a plurality of vertical jacks (210) of the adjustable trolley (200) are vertically arranged on the top of the box culvert, a trolley (220) is arranged on each vertical jack (210), the cross beam of the trolley (220) with the pulley facing upwards is arranged on the cross beam, the interval and the number of the vertical jacks (210) are determined according to the length of the trolley (220), a block (230) is arranged on the top of the box culvert and positioned at the front side of the trolley (220) in the jacking direction of the box culvert, the block (230) is higher than the trolley (220) and blocks the trolley (220) from moving forwards, the vertical jacks (210) of the adjustable trolley (200) are hydraulic jacks and are connected with the hydraulic synchronous control system, the hydraulic synchronous control system controls the push rod of the vertical jack (210) to be pushed out and retracted so as to adjust the height of the adjustable tackle (200).
7. The box culvert jacking construction device according to claim 5, wherein the rotatable connection is formed by forming a hole on the connected piece body or a welded structure on the connected piece, and the rotating shaft penetrates through the hole of the connected piece and is axially fixed, so that the hinged connection between the connected pieces is realized.
8. The device for box culvert jacking according to claim 5, wherein said connecting member (130) is installed on the box culvert by means of pre-buried or chemical anchors.
9. The box culvert jacking construction device according to claim 5, wherein the steel bow slope (110) is composed of a steel structural support (111) and a steel plate (112) fixed below the support, the steel plate (112) is longer than the steel structural support (111) in the advancing direction, and the steel plate (112) extends to below the box culvert bottom plate to block a gap between the box culvert bottom plate and the steel structural support (111).
10. The box culvert jacking construction device according to claim 9, wherein the steel structure brackets (111) are welded to each other using H-shaped steel.
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| CN202111647386.1A CN114135326A (en) | 2021-12-29 | 2021-12-29 | Construction method and construction device for jacking box culvert |
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| CN202111647386.1A CN114135326A (en) | 2021-12-29 | 2021-12-29 | Construction method and construction device for jacking box culvert |
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