CN111519550A - Central cable-side concrete cable-stayed bridge hanging basket suspension casting system - Google Patents
Central cable-side concrete cable-stayed bridge hanging basket suspension casting system Download PDFInfo
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- CN111519550A CN111519550A CN202010398623.4A CN202010398623A CN111519550A CN 111519550 A CN111519550 A CN 111519550A CN 202010398623 A CN202010398623 A CN 202010398623A CN 111519550 A CN111519550 A CN 111519550A
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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
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Abstract
The invention provides a hanging basket suspension casting system of a central cable-faced concrete cable-stayed bridge, wherein a hanging basket is a triangular hanging basket, a bearing platform, a lower truss and an upper truss are respectively anchored on a poured beam section through anchoring units, a bottom basket is hung on the upper truss through a hanging unit, the upper truss and the bottom basket are drawn to displace on the beam section through a walking unit, and a stay cable and the hanging basket are connected through a guy cable unit to form a front fulcrum; the bearing platform comprises auxiliary longitudinal beams on two sides and a main longitudinal beam in the middle, the main longitudinal beam and the auxiliary longitudinal beams are connected through a plurality of connecting beams, a guy cable unit is arranged at the non-anchor end of the main longitudinal beam, and a relative sliding device is arranged on the guy cable unit and used for adjusting the stretching angle of a stay cable.
Description
Technical Field
The invention relates to the technical field of construction of a concrete cable-stayed bridge girder, in particular to a hanging basket suspension casting system of a central cable-plane concrete cable-stayed bridge.
Background
The construction method of the main beam of the cable-stayed bridge is basically the same as that of a beam bridge, the large-span cable-stayed bridge generally adopts a cantilever pouring method or a cantilever splicing method, and for the cable-stayed bridge with small span, the construction method can also adopt a full-support cast-in-place method, a movable support cast-in-place method, a pushing method and a rotating method according to the construction conditions such as the site engineering terrain and the like. Among the above construction methods, the cantilever method is the most commonly used construction method for the main beam of the cable-stayed bridge because of its wide application range, and the other construction methods have limited application ranges. The construction of the main girder of the cable-stayed bridge adopts a plurality of hanging basket forms with various characteristics, but the common hanging basket forms can be summarized into three types, namely a rear anchor hanging basket, a stiff skeleton hanging basket and a front support hanging basket. For a central cable plane prestressed concrete cable-stayed bridge with a single-box multi-chamber box-shaped section, the conventional front support point hanging basket cannot meet the construction requirement.
Disclosure of Invention
In order to solve the technical problems, the invention provides a hanging basket suspension casting system of a central cable-faced concrete cable-stayed bridge, wherein the hanging basket is a triangular hanging basket and comprises an upper truss, a bottom basket, an anchoring unit, a suspension unit, a walking unit, a cable pulling unit and a template unit, wherein the bottom basket is composed of a bearing platform and a lower truss; the bearing platform comprises auxiliary longitudinal beams on two sides and a middle main longitudinal beam, the main longitudinal beam and the auxiliary longitudinal beams are connected through a plurality of connecting beams, a guy cable unit is arranged at the non-anchor end of the main longitudinal beam, and a relative sliding device is arranged on the guy cable unit and used for adjusting the stretching angle of the stay cable.
Furthermore, the bearing platform is composed of 2 main longitudinal beams on the inner side, 2 auxiliary longitudinal beams on the outer side and a plurality of connecting beams, steel plates are adopted to weld the whole steel box, the 2 main longitudinal beams extend backwards to form a main longitudinal beam anchor section, and two sides of the main longitudinal beam anchor section are respectively provided with a track beam for bottom basket traction walking.
Further, the upper truss is composed of 4 triangular trusses and comprises 2 inner triangular trusses and 2 outer triangular trusses, the inner triangular trusses are located at the tops of the side webs of the main beams, the outer triangular trusses are located at the tops of the inclined webs of the main beams, and the inner triangular trusses and the outer triangular trusses on the corresponding sides are connected into a whole through flat connection.
Furthermore, the lower truss is formed by connecting a plurality of truss pieces in a parallel connection mode, the interior of each truss piece is provided with an inclined strut support, the truss pieces are connected with the auxiliary longitudinal beams of the bearing platform in an upper and lower pin connection mode, and the anchor end of the lower truss is provided with an anchoring truss piece.
Further, the walking unit comprises an upper truss walking unit and a bottom basket walking unit, wherein the upper truss walking unit comprises a walking reaction frame preset on the beam section, a back pressure roller at the bottom of the upper truss, and a supporting cushion block arranged at the lower end of the middle part of the upper truss, and the upper truss walking unit is dragged to walk through a traction jack and a traction cable; the bottom basket walking unit comprises a walking sliding shoe sleeved on a longitudinal beam non-anchor section of the upper truss, an inverse hanging pulley arranged on the rail beams on two sides of the main longitudinal beam, a contact steel belt for connecting the walking sliding shoe and the inverse hanging pulley, and a traction reaction frame preset at the front end of the longitudinal beam of the upper truss, and the bottom basket walking unit is dragged to walk through a jack and a traction cable.
Furthermore, the anchoring unit is arranged on the poured beam section concrete and comprises a main longitudinal beam anchor, an auxiliary longitudinal beam anchor, a lower truss anchor, an upper truss anchor and a reverse hanging pulley anchor.
Furthermore, the suspension unit is arranged between the upper truss and the bottom basket of the hanging basket and comprises an auxiliary longitudinal beam front suspension and a lower truss front suspension.
Further, the relative sliding device is arranged at the front end of the main longitudinal beam, the front end of the main longitudinal beam extends and upwarps to form a sliding inclined plane, the length of the sliding inclined plane is in direct proportion to the radiation range of the corresponding stay cable, the relative sliding device is composed of adjusting block limiters, adjusting blocks, distribution beams, pin shafts, rails and rail limiters, the rail limiters are welded and installed on the upper side and the lower side of the sliding inclined plane, the adjusting block limiters are welded and installed on the left side and the right side of the sliding inclined plane, 4 rails are made of finish-rolled deformed steel bars, the adjusting blocks penetrate through reserved holes of the upper rail limiter and the lower rail limiter and are fixed by nuts, the adjusting blocks penetrate through the rails and are limited in the adjusting block limiters, the adjusting blocks are limited up and down by nuts to ensure that the adjusting blocks can be fixed at any position of the rails, the pin shafts are used for pin-connecting, therefore, the angle adjustment of the distribution beam is more convenient and faster, and the tension angle of the stay cable is ensured, so that the stay cable stress device can slide on the sliding plane.
Furthermore, the bottom basket is provided with a positioning device which comprises a jacking mechanism, a front anchor rod group, a rear anchor rod group and a thrust mechanism.
Further, the die block and the side form of template unit all adopt the bold steel form, connect into wholly with end basket, along with the common antedisplacement of end basket and promotion, the inner membrance adopts fritter steel form spelling to form, sets up the channel-section steel back of the body stupefied behind the panel, and the curb plate adopts and fixes to drawing the screw rod, and the roof adopts little steel pipe to support, does not set up the centre form bottom plate.
Advantageous effects
By applying the technical scheme of the invention, in the pouring state of the main beam of the concrete cable-stayed bridge, the front end of the front fulcrum hanging basket is reserved to be provided with a stay cable traction mechanism, the stay cable bears the gravity of a hanging basket platform, after the upper truss is anchored on the poured beam section, a suspender connected with the upper truss is arranged on the hanging basket platform, the hanging basket platform is connected with the upper truss, the front suspender is limited to always keep a certain tension force in construction to form a form of a rear fulcrum, the counter force of the rear anchoring point of the hanging basket platform directly acting on the poured beam section is reduced to be less than half of the counter force of the platform, and the larger rigidity of the upper truss is utilized to ensure that the uniform line shape of the concrete main beam is smooth and meets the design requirement. Under the traveling state of the cradle, the sliding shoe hanging platform of the upper truss on the inner side is adopted, and the platform adopts a traveling mode that traveling pulleys are hung and hung on the poured beam section to be combined, so that the traveling is realized by the stress of the upper truss in addition to the stress of the beam section.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of the upper truss of FIG. 1;
FIG. 3 is a schematic structural view of the load-bearing bottom basket of FIG. 1;
FIG. 4 is a schematic view of the walking trolley of FIG. 1;
FIG. 5 is a schematic structural view of the anchoring system of FIG. 1;
figure 6 is a schematic view of the lanyard system of figure 1.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.
As shown in fig. 1-6, the invention provides a suspended basket casting system of a central cable-faced concrete cable-stayed bridge, which comprises a bearing platform, a lower truss, an upper truss, a guy cable unit, a walking unit, an anchoring unit, a suspension unit and a template unit. The bearing platform comprises main longitudinal beams 1 and auxiliary longitudinal beams 2, wherein the main longitudinal beams 1 are composed of four sections, and the main longitudinal beams 1 and the auxiliary longitudinal beams 2 are connected through connecting beams 7 by adopting high-strength bolts; the lower truss consists of truss pieces 3 and anchoring truss pieces 9, the truss pieces 3 are 5 pieces in total, consist of longitudinal beams and parallel connection and inclined struts among the trusses, and are connected with the auxiliary longitudinal beam 2 of the cradle bearing platform in an upper and lower pin connection mode; the upper truss comprises an inner side main truss 11, an outer side main truss 12, a truss anchor rod group 13 and a supporting cushion block 19, wherein the inner side main truss 11 and the outer side main truss 12 are composed of longitudinal beams, upright columns, front and rear pull rods and the like. The longitudinal beams and the upright columns are all steel boxes welded by Q345 steel plates, the front pull rods and the rear pull rods are all steel plate strips, and the upright column joints and the gusset plates are all connected by high-strength bolts; the guy cable system comprises a distribution beam 26, an adjusting block 25, a pin shaft 26, a rail formed by phi 40 finish-rolled deformed steel bars and a nut 27. The adjusting block 25 can slide in the main longitudinal beam 1 along the inclined track groove, and the distribution beam 26 and the adjusting block 25 adopt a pin joint mode and can rotate around the adjusting block, so that the longitudinal position and the angle of the front supporting point stay cable can be adjusted to adapt to the change of the space position and the angle of the stay cable; the walking unit comprises a sliding shoe 18, a contact steel belt, a traction reaction frame 16, an anti-hanging pulley 21, an anti-hanging pulley base 20, a track beam 10, a traction jack and a traction cable, the strength of the cast concrete reaches the standard, an upper truss moves a section in advance before the cradle bearing platform moves forwards, then the tail part of a main truss is anchored with the cast concrete section, and the bearing platform descends to realize demoulding. After the bearing platform is put down in place, inserting a bolt which is connected with a steel belt between the bearing platform and the main truss, adjusting a back reverse hanging pulley 21 to bear force, then removing all the front and back anchor rod groups 8, and pulling a sliding shoe on the main truss by the bearing platform under the action of two jacks through a reaction frame 16 and phi 32 finish rolling threaded steel bars so as to drive a bottom basket of the hanging basket to move forwards;
the anchoring unit comprises a main longitudinal beam anchor, an auxiliary longitudinal beam anchor, a lower truss anchor, an upper truss anchor and a reverse hanging pulley anchor which are correspondingly arranged. The main longitudinal beam anchor comprises a front anchor rod group 8 and a rear anchor rod group, wherein the anchor rod group 8 is composed of a distribution beam 22, phi 40 finish-rolled deformed steel 23 and a nut gasket 24. The front anchor rod group 8 of the main longitudinal beam is arranged in the middle of the main longitudinal beam 1, the rear anchor rod group of the main longitudinal beam is arranged at the tail part of the main longitudinal beam 1, the function is to balance the overturning force generated when the suspended basket stay cable is initially tensioned, and simultaneously, the suspended basket stay cable is also used as a wind-resistant safe anchoring point, the lower truss is anchored above an anchoring truss sheet 9 connected with the tail part, the upper truss is anchored and comprises a truss anchor rod group 13 arranged at the rear end of a longitudinal beam, the suspension system comprises an auxiliary longitudinal beam front suspension 14 and a lower truss front suspension 15, the bottom basket and the upper truss are connected into a whole, the template system comprises a bottom template, a side template, an inner template and the like, the bottom template and the side template of the template unit both adopt large steel templates, connect into whole with end basket, along with the common antedisplacement of end basket and promotion, the inner membrance adopts the piecing together of fritter steel mould to form, sets up the channel-section steel back of the body stupefied behind the panel, and the curb plate adopts and fixes to drawing the screw rod, and the roof adopts little steel pipe to support, does not set up the centre form bottom plate.
When the main girder assembly is used, the main girder is pre-buried and limited left and right before concrete is poured on the main girder of the concrete cable-stayed bridge, the inner and outer main girders are connected to form a whole, the inner and outer main girders on one side synchronously advance, the inner and outer main girder back pressure rollers are installed before the main girder travels, the anchor bolt group is arranged after the main girder is disassembled, the supporting cushion blocks are installed and firmly fixed at the designed positions below the main girder, and the sliding shoes are fixed to prevent the main girder from traveling to drive the sliding shoes. A jack and an embedded reaction point are used as advancing devices, each stroke is 15cm, and after the main truss moves to a designed position, the main truss anchor rod group is used for anchoring and tightening. After the main truss walks in place, the front suspender of the auxiliary longitudinal beam is anchored on the inner main truss through the distribution beam, and the foremost anchoring hole of the auxiliary longitudinal beam is anchored, so that the collision between the anchoring distribution beam and the C-shaped sliding shoe position is avoided, and the hanging basket is placed downwards. And after the cable force of the stay cable is converted to the box girder and the second tensioning is carried out (namely after the stay cable system is converted), the hanging basket is lowered by 500mm by utilizing the front anchor rod group of the main longitudinal beam and the front hanging rod group of the auxiliary longitudinal beam, and the hydraulic jack is operated to be synchronously and balancedly lowered. And (3) after the load-bearing bottom frame of the hanging basket is lowered to reach a designated position, connecting the C-shaped sliding shoe with the auxiliary longitudinal beam and the walking trolley by using a steel hanging belt, and ensuring the firm connection of the upper pin joint and the lower pin joint of the steel belt. And then before the rail is not stressed, anchoring the hanging seat of the traveling trolley in place and clinging to the bottom plate, converting the self gravity stress of the hanging basket bearing bottom frame to the steel hanging strip and the traveling trolley, finally stressing the steel hanging strip and the traveling trolley on the main truss and the previous section of concrete, finally removing all anchor rod groups, and installing C-shaped sliding shoes and a traveling rail counterforce device to meet the traveling condition of the hanging basket bottom basket. A 70t penetrating jack is installed at the front end of the inner main truss to serve as forward moving power, and the jack is connected with the C-shaped sliding shoe through a phi 32mm finish rolling threaded steel bar; and a 25t penetrating jack is arranged at the tail end of the walking track, the jack is connected with the walking trolley through a steel strand with the diameter phi of 15.24mm, and the hanging basket moves forwards to the next section under the action of the traction mechanism. Hang basket bearing chassis and target in place the back, anchor all stock groups rapidly, jib before the inboard main purlin increases the anchor point, reduces the risk, after guaranteeing that the stock group is complete atress, can demolish steel suspender and walking dolly. The hanging basket is lifted through the front suspension rod and the anchor rod group, the thrust mechanism, the tensioning mechanism and the like are installed, the die is erected, the elevation is adjusted, when the elevation of the bottom die is adjusted, a special person is required to conduct in a unified mode, and each control point sends a person to be responsible for monitoring.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A hanging basket suspension casting system of a central cable-faced concrete cable-stayed bridge is characterized in that the bearing platform, the lower truss and the upper truss are respectively anchored on a poured beam section through anchoring units, the bottom basket is hung on the upper truss through suspension units, the upper truss and the bottom basket are drawn to displace on the beam section through the walking units, and a stay cable and the hanging basket are connected through the stay cable units to form a front pivot; the bearing platform comprises auxiliary longitudinal beams on two sides and a middle main longitudinal beam, the main longitudinal beam and the auxiliary longitudinal beams are connected through a plurality of connecting beams, a guy cable unit is arranged at the non-anchor end of the main longitudinal beam, and a relative sliding device is arranged on the guy cable unit and used for adjusting the stretching angle of the stay cable.
2. The suspended basket casting system of a central cable-faced concrete cable-stayed bridge according to claim 1, wherein the bearing platform is composed of 2 inner main longitudinal beams, 2 outer auxiliary longitudinal beams and a plurality of connecting beams, steel plates are welded into a whole steel box, the 2 main longitudinal beams extend backwards to form a main longitudinal beam anchor section, and two sides of the main longitudinal beam anchor section are respectively provided with a track beam for bottom basket traction walking.
3. The system of claim 1, wherein the upper truss is composed of 4 trusses of inner and outer trusses, the inner trusses are located at the top of the side web of the main beam, the outer trusses are located at the top of the inclined web of the main beam, and the inner and outer trusses on the corresponding sides are connected into a whole through a flat connection.
4. The system of claim 1, wherein the lower truss is formed by connecting a plurality of truss pieces in parallel, the truss pieces are internally provided with diagonal bracing supports, the truss pieces are connected with the auxiliary longitudinal beams of the bearing platform in an upper and lower pin joint manner, and the anchor end of the lower truss is provided with an anchoring truss piece.
5. The hanging basket suspension casting system of the central cable-faced concrete cable-stayed bridge according to claim 1, wherein the traveling unit comprises an upper truss traveling unit and a bottom basket traveling unit, the upper truss traveling unit comprises a traveling reaction frame preset on a beam section, a back pressure roller at the bottom of an upper truss, and a support cushion block arranged at the lower end of the middle part of the upper truss, and the traveling unit is pulled by a traction jack and a traction cable; the bottom basket walking unit comprises a walking sliding shoe sleeved on a longitudinal beam non-anchor section of the upper truss, an inverse hanging pulley arranged on the rail beams on two sides of the main longitudinal beam, a contact steel belt for connecting the walking sliding shoe and the inverse hanging pulley, and a traction reaction frame preset at the front end of the longitudinal beam of the upper truss, and the bottom basket walking unit is dragged to walk through a jack and a traction cable.
6. The system of claim 1, wherein the anchoring unit is disposed on the poured beam section concrete, and comprises a main longitudinal beam anchor, an auxiliary longitudinal beam anchor, a lower longitudinal beam anchor, an upper truss anchor and a reverse hanging pulley anchor, the main longitudinal beam anchor comprises a front anchor rod set disposed in the middle of the main longitudinal beam and a rear anchor rod set disposed at the tail of the main longitudinal beam, and the lower truss anchor is disposed above the anchoring truss.
7. The suspended basket casting system of the central cable-faced concrete cable-stayed bridge according to claim 1, wherein the suspension unit is arranged between an upper truss and a bottom basket of the suspended basket and comprises an auxiliary longitudinal beam front suspension and a lower truss front suspension.
8. The hanging basket suspension casting system of the central cable-faced concrete cable-stayed bridge according to claim 1, wherein the relative sliding device is arranged at the front end of the main longitudinal beam, the front end of the main longitudinal beam is extended and upwarps to form a sliding slope, the length of the sliding slope is in direct proportion to the radiation range of the corresponding stay cable, the relative sliding device is composed of an adjusting block limiter, an adjusting block, a distribution beam, a pin shaft, a track and a track limiter, the track limiter is welded and installed at the upper side and the lower side of the sliding slope, the adjusting block limiter is welded and installed at the left side and the right side of the sliding slope, 4 tracks are made of finish-rolled thread steel, pass through reserved holes of the upper and lower track limiters and are fixed by nuts, the adjusting block is penetrated through the track and limited in the adjusting block limiter, the upper and the lower limits of the adjusting block are limited by the nuts to ensure that the adjusting block can be, the adjusting block is connected with the distribution beam in a pin joint mode through the pin shaft, so that the distribution beam can rotate around the axis of the pin shaft, the angle adjustment of the distribution beam is more convenient and quick, the stretching angle of the stay cable is guaranteed, and the stay cable stress device can slide on a sliding plane.
9. The suspended basket casting system of the central cable-faced concrete cable-stayed bridge according to claim 1, wherein the bottom basket is provided with a positioning device which comprises a jacking mechanism, a front anchor rod group, a rear anchor rod group and a thrust mechanism.
10. The central cable-side concrete cable-stayed bridge hanging basket suspension casting system according to claim 1, wherein the bottom die and the side dies of the die plate unit are made of large steel die plates, are connected with the bottom basket into a whole, move forward and lift along with the bottom basket together, the inner film is formed by assembling small steel die plates, a channel steel back edge is arranged behind the face plate, the side plates are fixed by using counter-pulling screw rods, the top plate is supported by using small steel tubes, and an inner die bottom plate is not arranged.
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| CN202010398623.4A CN111519550A (en) | 2020-05-12 | 2020-05-12 | Central cable-side concrete cable-stayed bridge hanging basket suspension casting system |
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| CN202010398623.4A CN111519550A (en) | 2020-05-12 | 2020-05-12 | Central cable-side concrete cable-stayed bridge hanging basket suspension casting system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112942132A (en) * | 2021-04-01 | 2021-06-11 | 中交二航局第二工程有限公司 | Front supporting point composite hanging basket and shifting method thereof |
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2020
- 2020-05-12 CN CN202010398623.4A patent/CN111519550A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112942132A (en) * | 2021-04-01 | 2021-06-11 | 中交二航局第二工程有限公司 | Front supporting point composite hanging basket and shifting method thereof |
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