CN111519550A - A hanging basket suspension pouring system for a central cable-plane concrete cable-stayed bridge - Google Patents

Abstract

The invention provides a hanging and pouring system for a hanging basket of a central cable-plane concrete cable-stayed bridge. The hanging basket is a triangular hanging basket. The unit hangs the bottom basket on the upper truss, pulls the upper truss and the bottom basket to displace on the beam section through the walking unit, and connects the stay cable and the hanging basket through the pulling cable unit to form a front fulcrum; the bearing platform includes two sides. The auxiliary longitudinal beam and the main longitudinal beam in the middle, the main longitudinal beam and the auxiliary longitudinal beam are connected by several connecting beams, the non-anchor end of the main longitudinal beam is provided with a pulling cable unit, and the pulling cable unit is provided with a relative sliding device for In order to adjust the tension angle of the cable-stayed cable, the invention solves the problem of poor lateral stability in the construction of the single-cable plane cable-stayed bridge using the conventional drag-cable hanging basket, and also brings into play the advantage of using the drag-cable hanging basket for the cable-stayed bridge.

Description

A hanging basket suspension pouring system for a central cable-plane concrete cable-stayed bridge

technical field

The invention relates to the technical field of main girder construction of concrete cable-stayed bridges, in particular to a hanging basket suspension pouring system of a central cable-plane concrete cable-stayed bridge.

Background technique

The construction method of the main beam of the cable-stayed bridge is basically the same as that of the girder bridge. The long-span cable-stayed bridge generally adopts the cantilever casting method or the cantilever assembly method. Pouring method, movable bracket cast-in-place method, jacking method and rotation method construction. Among the above construction methods, the cantilever method has become the most commonly used construction method for the main beam of the cable-stayed bridge due to its wide application range, while the other construction methods are limited in scope. There are many forms of hanging baskets used in the construction of the main beam of cable-stayed bridges, each with its own characteristics, but the commonly used hanging baskets can be summarized into three categories, namely rear anchor hanging baskets, rigid skeleton hanging baskets and front fulcrum hanging baskets. For a single-box multi-chamber box-section central cable-plane prestressed concrete cable-stayed bridge, the conventional front fulcrum hanging basket can no longer meet the needs of construction.

SUMMARY OF THE INVENTION

In order to solve the above technical problems, the present invention provides a hanging and pouring system for a central cable-plane concrete cable-stayed bridge. unit, suspension unit, walking unit, pulling cable unit, template unit, the bearing platform, lower truss, and upper truss are respectively anchored on the poured beam section through the anchoring unit, and the bottom basket is hung on the upper truss through the suspension unit, The upper truss and the bottom basket are pulled by the walking unit to displace on the beam section, and the stay cable and the hanging basket are connected to form the front fulcrum through the pulling cable unit; the bearing platform includes the auxiliary longitudinal beams on both sides and the main longitudinal beam in the middle. The main longitudinal beam and the auxiliary longitudinal beam are connected by several connecting beams, the non-anchor end of the main longitudinal beam is provided with a stay cable unit, and the stay cable unit is provided with a relative sliding device for adjusting the tension angle of the stay cable.

Further, the bearing platform is composed of 2 main longitudinal beams on the inner side, 2 auxiliary longitudinal beams on the outer side and several connecting beams, which are welded by steel plates to form a whole steel box, and the rearward extension of the 2 main longitudinal beams forms the main longitudinal beam anchors. The two sides of the main longitudinal beam anchor section are respectively provided with track beams for the traction of the bottom basket.

Further, the upper truss is composed of 4 triangular trusses, including 2 inner triangular trusses and 2 outer triangular trusses, the inner triangular truss is located on the top of the side web of the main girder, and the outer triangular truss is located on the inclined web of the main girder. At the top, the inner triangular trusses and the outer triangles on the corresponding side are connected into a whole by parallel connection.

Further, the lower truss is composed of a plurality of truss pieces connected by parallel connection, the truss pieces are provided with diagonal bracing supports, the truss pieces and the auxiliary longitudinal beams of the bearing platform are connected by upper and lower pin connections, and the anchor ends of the lower trusses are connected. Equipped with anchor girders.

Further, the walking unit includes an upper truss walking unit and a bottom basket walking unit, and the upper truss walking unit includes a walking reaction frame preset on the beam section, a back pressure roller at the bottom of the upper truss, and a lower end of the middle of the upper truss. The support pad is pulled and traveled by traction jacks and traction cables; the bottom basket walking unit includes a walking shoe sleeved on the non-anchor section of the longitudinal beam of the upper truss, and anti-hanging shoes arranged on the track beams on both sides of the main longitudinal beam The pulley, the connecting steel belt connecting the walking shoes and the anti-trailer pulley, and the traction reaction frame preset at the front end of the longitudinal beam of the upper truss, are pulled by the jack and the traction cable.

Further, the anchoring unit is arranged on the concrete of the poured beam section, including main longitudinal beam anchoring, auxiliary longitudinal beam anchoring, lower truss anchoring, upper truss anchoring, and reverse pulley anchoring.

Further, the suspension unit is arranged between the upper truss and the bottom basket of the hanging basket, including auxiliary longitudinal beam front suspension and 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 is elongated and upturned to form a sliding slope, and the length of the sliding slope is proportional to the radiation range of the corresponding stay cable, and the relative sliding The moving device is composed of an adjustment block limiter, an adjustment block, a distribution beam, a pin shaft, a track, and a track limiter. The track limiter is welded and installed on the upper and lower sides of the sliding slope, and the adjustment block limiter is welded. Installed on the left and right sides of the sliding slope, the 4 rails are made of fine-rolled threaded steel, pass through the reserved holes of the upper and lower rail limiters and are fixed with nuts. In the block stopper, the adjusting block is limited up and down by a nut to ensure that the adjusting block can be fixed at any position on the track, and the adjusting block is pinned to the distribution beam by a pin, so that the distribution beam can rotate around the axis of the pin, so as to achieve The adjustment of the angle of the distribution beam is more convenient and fast, and the tension angle of the stay cable is ensured, so that the force bearing device of the stay cable can slide on the sliding plane.

Further, the bottom basket is provided with a positioning device, including a jacking mechanism, front and rear anchor rod groups of the main longitudinal beam, and a thrust mechanism.

Further, the bottom mold and the side mold of the template unit are made of large steel templates, which are connected to the bottom basket as a whole, and move forward and lift together with the bottom basket. The inner film is made of small steel molds. The back corrugation of channel steel is set at the back, the side plate is fixed by the pull screw, the top plate is supported by small steel pipe, and the bottom plate of the inner mold is not set.

beneficial effect

Applying the technical scheme of the present invention, in the pouring state of the main girder of the concrete cable-stayed bridge, the front end of the hanging basket of the front fulcrum is reserved and the cable-stayed cable mechanism is installed, and the cable-stayed cable is used to bear the weight of the hanging basket platform, and the upper truss is anchored to the already poured truss. After the beam section is installed, a boom connected to the upper truss is set on the hanging basket platform to connect the hanging basket platform with the upper truss, and the front boom is limited to maintain a certain tension during construction to form a rear fulcrum, so that the hanging basket The reaction force directly acting on the poured beam section by the rear anchor point of the platform is reduced to less than half of the platform reaction force, and the higher stiffness of the upper truss is used to ensure that the line of the concrete main beam is uniform and meets the design requirements. In the walking state of the hanging basket, the upper truss shoe on the inner side is used to hang the platform, and the platform adopts the walking mode of the walking pulley hanging on the poured beam section, so that in addition to the beam section, the upper truss is also stressed.

Description of drawings

1 is a schematic structural diagram of an embodiment of the present invention;

Fig. 2 is the structural schematic diagram of the upper truss in Fig. 1;

Fig. 3 is the structural representation of the load-bearing bottom basket in Fig. 1;

Fig. 4 is the structural representation of the walking trolley in Fig. 1;

FIG. 5 is a schematic structural diagram of the anchoring system in FIG. 1;

FIG. 6 is a schematic structural diagram of the guying system in FIG. 1 .

Detailed ways

The present invention will be further described below with reference to specific embodiments. The following examples are only used to illustrate the present invention and not to limit the scope of the present invention.

As shown in Figures 1-6, the present invention provides a hanging basket suspension pouring system for a central cable-plane concrete cable-stayed bridge, including a bearing platform, a lower truss, an upper truss, a cable unit, a walking unit, an anchoring unit, a suspension unit, Template unit. Among them, the bearing platform includes a main longitudinal beam 1 and an auxiliary longitudinal beam 2. The main longitudinal beam 1 is composed of four segments. Between the main longitudinal beam 1 and between the main longitudinal beam 1 and the auxiliary longitudinal beam 2, the connecting beam 7 adopts high-strength bolts. Connect; the lower truss is composed of truss piece 3 and anchor truss piece 9. The truss piece 3 has a total of 5 pieces. The upper truss includes an inner main truss 11, an outer main truss 12, a truss anchor rod group 13 and a support block 19. The inner main truss 11 and the outer main truss 12 are composed of longitudinal beams, columns, front and rear tie rods, etc. Longitudinal beams and columns are made of steel boxes welded with Q345 steel plates, front and rear tie rods are made of steel strips, column joints and gusset plates are connected by high-strength bolts; the stay cable system includes distribution beam 26, adjustment block 25, pin 26 , The track and nut 27 formed by Φ40 finishing rebar. The adjustment block 25 can slide in the main longitudinal beam 1 along the inclined track groove, and the distribution beam 26 and the adjustment block 25 are pinned and can be rotated around the adjustment block, so that the position and the longitudinal bridge direction of the front fulcrum stay cable can be adjusted. Angle, to adapt to the change of the space position and angle of the stay cable; the walking unit includes the sliding shoe 18 and the connecting steel belt, the traction reaction frame 16, the reverse pulley 21, the reverse pulley base 20, the track beam 10, the traction jack and the traction The strength of the poured concrete reaches the standard. Before the hanging basket bearing platform is moved forward, the upper truss is moved forward by one segment, and then the tail of the main truss is anchored with the poured concrete segment, and the bearing platform is lowered to realize demoulding. After the bearing platform is lowered into place, insert the bolt connecting the steel belt between the bearing platform and the main girder, adjust the rear reverse pulley 21 to make it bear the force, and then remove all the front and rear anchor rod groups 8, and the bearing platform can be installed on the two sets. Under the action of the jack, the sliding shoe on the main truss is pulled through the reaction frame 16 and the φ32 fine-rolled threaded steel bar, so as to drive the bottom basket of the hanging basket to move forward;

The anchoring unit includes corresponding main longitudinal beam anchorage, auxiliary longitudinal beam anchorage, lower truss anchorage, upper truss anchorage, and anti-trailer pulley anchorage. Among them, the main longitudinal beam anchorage includes a front bolt group 8 and a rear bolt group, wherein the bolt group 8 is composed of a distribution beam 22 , a Φ40 finish-rolled threaded steel 23 and a nut washer 24 . The front anchor rod group 8 of the main longitudinal beam is located in the middle of the main longitudinal beam 1, and the rear anchor rod group of the main longitudinal beam is located at the tail of the main longitudinal beam 1. Also as a wind-resistant safety anchor point, the lower truss is anchored above the anchor truss 9 connected at the tail, the upper truss anchor includes the truss bolt group 13 provided at the rear end of its longitudinal beam, and the suspension system includes auxiliary longitudinal beam front suspension 14, The lower truss is suspended by 15 in front, so that the bottom basket and the upper truss are connected as a whole. The formwork system is composed of bottom mold, side mold, inner mold, etc. As a whole, it moves forward and lifts together with the bottom basket. The inner membrane is made of small steel modules. The back of the channel steel is set behind the panel. Set the inner mold base plate.

When in use, before pouring the concrete of the main girder of the concrete cable-stayed bridge, the left and right limits of the upper main truss are pre-buried, and the inner and outer main trusses are connected to form a whole. The inner and outer main trusses of one side move synchronously. The back pressure roller of the truss is removed, the rear anchor bolt group of the main truss is removed, the support block is installed at the designed position under the main truss and fixed firmly, and the sliding shoe is fixed to prevent the sliding shoe from being driven by the walking of the main truss. The jack and the pre-embedded reaction force point are used as advance devices, and each stroke is 15cm. After the main truss reaches the design position, the anchor rod group of the main truss is used for anchoring and tightening. After the main girder is in place, anchor the front boom of the auxiliary longitudinal beam on the inner main girder through the distribution beam, and anchor the front anchoring hole of the auxiliary longitudinal beam to avoid the position conflict between the anchor distribution beam and the C-type sliding shoe, which is used for hanging baskets . After the cable force of the stay cable is converted to the box girder and tensioned for the second time (that is, after the conversion of the stay cable system), use the front anchor rod group of the main longitudinal beam and the front suspension rod group of the auxiliary longitudinal beam to lower the hanging basket by 500mm. Hydraulic jacks should be lowered synchronously and balanced. When the load-bearing chassis of the hanging basket is lowered to the designated position, the steel sling is used to connect the C-type sliding shoe, the auxiliary longitudinal beam and the walking trolley, and the connection between the upper and lower pin joints of the steel belt is ensured. Then, before the track is not stressed, anchor the hanging seat of the walking trolley in place and close to the bottom plate. The gravity force of the hanging basket load-bearing chassis itself is transferred to the steel sling and the walking trolley, and finally the force is applied to the main truss and the concrete of the previous section. , and finally remove all anchor rod groups, install C-type sliding shoes and walking track reaction force device to meet the walking conditions of hanging basket bottom basket. A 70t through-center jack is installed at the front end of the inner main girder as the forward movement force. The jack and the C-type slipper are connected by Φ32mm fine-rolled threaded steel bars; a 25t through-center jack is installed at the end of the walking track, and the jack and the traveling trolley pass through the diameter of Φ15.24mm steel strand. Line connection, the hanging basket moves forward to the next segment under the action of the traction mechanism. After the load-bearing chassis of the hanging basket is in place, quickly anchor all the anchor rod groups, including the front boom of the inner main girder, increase the anchorage points and reduce the risk. After ensuring that the anchor rod group is fully stressed, the steel sling and the walking trolley can be removed. . Lift the hanging basket through the front boom and the anchor rod group, install the thrust mechanism, the tension mechanism, etc., when the mold is erected, the elevation is adjusted, and the bottom mold elevation is adjusted, a special person should be assigned for unified command, and each control point is assigned to be responsible for monitoring.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within 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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