Construction device and construction method suitable for integral hoisting of steel bar segments of cantilevered beams

Abstract

The present invention discloses a construction device and a construction method suitable for the integral hoisting of a cantilevered beam steel bar segment. The hanging basket structure includes a hanging basket main truss, a hanging basket side mold and a bottom mold. The hanging basket main truss is fixed to the cantilever beam end of the beam segment through an anchoring system. The two sides of the hanging basket main truss are respectively provided with hanging basket outer cantilevers. The lower end of the hanging basket outer cantilever is fixed with a first running track and a second running track extending along the longitudinal direction of the beam segment. The first running track is matched with a first active running mechanism. The first active running mechanism is provided with a first hanging basket crane. The lower end of the sling of the first hanging basket crane is connected to the hanging basket side mold and the bottom mold. The second running track is matched with a second active running mechanism. The second active running mechanism is provided with a second hanging basket crane for hoisting the steel bar cage of the segment to be assembled. The scheme of the present invention has a short construction period, good construction operability, good construction accuracy and quality, is economical and applicable, and reduces construction risks.

Description

Technical Field

[0001] The invention patent relates to the field of bridge engineering, and specifically to a construction device and a construction method suitable for the overall lifting of steel bar segments of cantilevered beams. Background Art

[0002] For large-span prestressed concrete beam bridges, the cantilever assembly of prefabricated beam segments is difficult to achieve due to the weight of the beam segments, and the cantilever casting method is conventionally used. When the above conventional construction method is used, there are the following disadvantages:

[0003] 1. Long construction period. The cantilever casting construction process is complicated, the construction period is limited by the steel cage binding, and the high-altitude operation affects the construction progress.

[0004] 2. Difficulties in construction and operation. The steel cage is tied at high altitude, and the operation site, personnel and machinery are limited, making construction and operation difficult.

[0005] 3. The construction safety risk is high. The steel bars and related tools are transported to high altitudes in a scattered manner, which also poses a certain risk to the environment under the bridge. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a construction device and a construction method suitable for the overall lifting of the steel bar segments of the cantilevered beam. The scheme of the present invention has the advantages of short construction period, good construction operability, good construction accuracy and quality, economic applicability, reduced construction risk, good terrain adaptability, and proposes a new construction scheme for large-span prestressed concrete beam bridges with limited transportation conditions under the bridge.

[0007] The present invention is implemented as follows: the present invention discloses a construction device suitable for the overall lifting of a cantilevered beam steel bar segment, comprising a hanging basket main truss and a hanging basket side form and a bottom form. The hanging basket main truss is fixed to the cantilever beam end of the beam segment through an anchoring system. Both sides of the hanging basket main truss are respectively provided with hanging basket outer cantilevers. The lower end of the hanging basket outer cantilever is fixed with a first running track and a second running track extending along the longitudinal direction of the beam segment. The first running track is matched with a first active running mechanism, and the first active running mechanism is provided with a first hanging basket crane. The lower end of the sling of the first hanging basket crane is connected to the hanging basket side form and the bottom form. The second running track is matched with a second active running mechanism, and the second active running mechanism is provided with a second hanging basket crane, which is used to lift the steel bar cage of the segment to be assembled.

[0008] The main truss of the hanging basket can be fixed to the cantilever beam end of the beam section through an anchoring system, and can move forward after the anchoring is released. The lower end of the outer cantilever of the hanging basket is fixed with a first running track (inside) and a second running track (outside) extending along the longitudinal direction of the beam section.

[0009] A hanging basket crane needs to be installed on the first active running mechanism to hang the side and bottom forms of the hanging basket. When pouring the first section of a continuous beam in suspended pouring construction, the bottom form can be assembled on the ground or installed in the air, and then lifted into place by a hanging basket crane (also called a winch, which can be unified as a winch to avoid confusion with the bridge deck crane behind). Then workers can install the side form on the bottom form. This process is a routine step in suspended pouring construction. The hanging basket crane is a finished product.

[0010] The second basket crane can also be called a winch. Its function is to lift the structure by retracting and releasing the wire rope.

[0011] Furthermore, the lower end of the sling of the second hanging basket crane is connected to a distribution beam for connecting to the steel cage of the segment to be assembled; the distribution beam includes a crossbeam, on which a sling is provided, the upper end of the sling is connected to the crossbeam, the lower end of the sling is connected to the steel cage of the segment to be assembled, and the two ends of the crossbeam are respectively connected to the lower ends of the slings of the second hanging basket crane on both sides of the main truss of the hanging basket; the length H2 of the crossbeam is greater than or equal to the spacing H1 between the second running rails on both sides of the main truss of the hanging basket.

[0012] Furthermore, the first running track is arranged in parallel with the second running track, and the first running track is located inside the second running track.

[0013] The invention is suitable for the construction device for integrally lifting the steel bar segment of the cantilevered beam, and further comprises a bridge crane and a steel cage sling. The bridge crane comprises a main truss of the bridge crane, and a bridge crane running wheel is arranged at the lower end of the main truss of the bridge crane, which cooperates with a track arranged on the bridge deck. Both sides of the main truss of the bridge crane are respectively provided with a bridge crane outer cantilever, and the lower end of the outer cantilever of the bridge crane is provided with a third running track, and the third running track is cooperated with a bridge crane hoisting winch. The hoisting winch of the bridge deck crane is provided with a hoisting winch sling, the lower end of the hoisting winch sling is connected with a hoisting winch sling buckle, the lower end of the steel cage sling is connected with the steel cage of the to-be-assembled segment, the lower end of the sling of the second hanging basket crane is connected with a hanging basket sling buckle, the upper end of the steel cage sling is connected with a steel cage sling buckle, which is used to be buckled with the hoisting winch sling buckle of the bridge deck crane or the hanging basket sling buckle.

[0014] The structure of the bridge crane is similar to that of the hanging basket system, and the structure of the bridge crane can be simplified. A running track is set on the lower side of the outer cantilever of the bridge crane. Since the locks of the bridge crane and the hanging basket need to be connected when transferring the steel cage, the locks of the two should be very close. However, the hanging basket structure occupies a certain position, and the bridge crane cannot continue to move forward after it reaches the back of the main truss of the hanging basket. The running mechanism at the cantilever end needs to continue to move forward a short distance and connect with the sling of the hanging basket. When the bridge crane transports the segmental steel cage and walks near the main truss of the hanging basket, it cannot move forward because the main truss occupies a certain position. Therefore, the sliding rail at the lower end of the cantilever allows the sling holding the steel cage to continue to move forward. The sling under the outer cantilever of the hanging basket retreats to the vicinity of the sling of the bridge crane, making it convenient for the two slings to be re-locked and unlocked.

[0015] The basket crane and winch are the same thing. The working principle is that the motor drives the wire rope drum through the reducer, retracts and releases the wire rope, and changes the direction through different pulleys. The process requirements are mainly the drum speed, that is, the wire rope movement speed and the safety and reliability of the braking system. The winch is a relatively simple lifting or traction machine. The winch (also called winch / electric hoist) is a light and small lifting equipment that uses a drum to wind a wire rope or chain to lift or pull heavy objects. The winch can lift vertically, horizontally or tilt the heavy object. The winch is divided into two types: manual winch and electric winch. Electric winch is now the main one. The electric winch is composed of an electric motor, a transmission mechanism and a drum or sprocket, and is divided into two types: wire rope electric hoist and chain electric hoist.

[0016] The present invention can be provided with one motor to drive the roller to travel and the sling to lift at the same time, or two motors can be arranged side by side along the bridge direction, one motor controls the movement of the roller and the other controls the lifting of the sling.

[0017] Furthermore, the lower end of the steel cage sling is connected to a distribution beam for connecting to the steel cage of the segment to be assembled; the distribution beam includes a crossbeam, on which a sling is provided, the upper end of the sling is connected to the crossbeam, the lower end of the sling is connected to the steel cage of the segment to be assembled, and the two ends of the crossbeam are respectively connected to the lower ends of the slings of the second hanging basket crane on both sides of the main truss of the hanging basket; the length H2 of the crossbeam is greater than or equal to the spacing H1 between the third running tracks on both sides of the main truss of the bridge deck crane.

[0018] The invention discloses a construction method suitable for integrally hoisting a cantilever beam steel bar segment, adopts a construction device suitable for integrally hoisting a cantilever beam steel bar segment, and the specific construction method comprises the following steps:

[0019] The basket crane lifts the segment reinforcement cage at the front end of the cantilever and lifts the segment reinforcement cage into place;

[0020] The side mold and bottom mold of the hanging basket slide forward into place;

[0021] Install the load-bearing hangers for side and bottom formwork concrete pouring;

[0022] Connect new and old segment steel bars;

[0023] Pour concrete and tension prestress to complete the assembly of the segment. Repeat this cycle to complete the assembly and pouring of the steel cages of all beam segments.

[0024] The steel bars of the previous segment (already cast) are the old segment steel cage, and the steel cage of the segment to be constructed is the new segment steel cage.

[0025] After pouring the No. 0 block, it is usually on the hanging basket crane, first build some beams and other working platforms, use the bracket for the No. 0 block construction, and then build the side formwork and bottom formwork on the working platform. This is the conventional construction process. When directly hoisting and splicing the steel cage, just move it forward to the front of the side formwork and bottom formwork. The main thing is to avoid the two vertical directions.

[0026] The invention discloses a construction method suitable for integrally hoisting a cantilever beam steel bar segment, adopts a construction device suitable for integrally hoisting a cantilever beam steel bar segment, and the specific construction method comprises the following steps:

[0027] 1) The bridge crane lifts the segment reinforcement cage at the set position;

[0028] 2) The bridge crane transports the segment steel cage to the hanging basket at the front end of the cantilever beam;

[0029] 3) The bridge crane transfers the segment steel cage to the second hanging basket crane;

[0030] 4) The second hanging basket crane lifts the segment reinforcement cage into place;

[0031] 5) Move the side form and bottom form of the hanging basket forward to their positions, install the load-bearing hangers for pouring concrete on the side form and bottom form, and connect the new and old segment steel cages;

[0032] 6) Pour concrete and tension prestress to complete the assembly of the segment. Repeat this cycle to complete the assembly and pouring of the steel cages of all beam segments.

[0033] The segmental reinforcement cages are prefabricated centrally at the bridge piers or in factories.

[0034] Furthermore, the bridge crane transfers the segment steel cage to the second basket crane of the basket, specifically including: hooking the basket sling cable lock with the steel cage sling cable lock, and then unhooking the bridge crane hoisting winch cable lock from the steel cage sling cable lock, so as to realize the transformation of the segment steel cage from being carried by the bridge crane to being carried by the basket.

[0035] Furthermore, step 5) also includes the following steps: transferring the steel cage sling to the bridge crane, and the bridge crane returns to the set position; transferring the steel cage sling to the bridge crane, specifically including: hooking the bridge crane hoisting winch sling buckle with the steel cage sling buckle, unhooking the basket sling buckle from the steel cage sling buckle, and removing the connection between the steel cage sling and the segment steel cage. After the steel cage is hoisted in place and the side mold bottom mold is installed with the bearing hanger, the steel cage sling can be removed.

[0036] Furthermore, step 4) also includes the following steps: the second active running mechanism drives the segment reinforcement cage to slide along the second running track to the front end into position.

[0037] Beneficial effects of the present invention:

[0038] 1. The construction period is greatly shortened. By comparison, under normal circumstances, the time for segment reinforcement binding can be saved by 3 days, and for high piers, about 4-5 days. The construction period of the present invention is shortened by 30% compared with the conventional cantilever casting construction method. The docking, hoisting and binding of multi-segment reinforcement cages can be carried out simultaneously, especially for bridges with large spans and many segments, the construction period has outstanding advantages.

[0039] 2. Good construction operability. Compared with conventional construction methods, it avoids the operation of tying steel cages at high altitude, and the construction operation is simple and convenient, which greatly reduces the construction risk.

[0040] 3. Good construction accuracy and quality. Compared with conventional construction methods, the steel cage can be prefabricated in the factory or tied on the ground, and the quality is guaranteed.

[0041] 4. Strong terrain adaptability. It can be applied to various bridge locations with limited transportation conditions under bridges, such as V-shaped canyon areas, land with limited transportation conditions, and tidal flat areas that are not convenient for segment transportation.

[0042] 5. Suitable for bridges with large spans. For large-span rigid frames or continuous beams, only the steel cage needs to be hoisted, and the hoisting weight is light. Compared with conventional prefabricated assembly, which requires hoisting the entire concrete segment, the crane tonnage is easier to meet the requirements.

[0043] 6. Short-line construction method is available, which is beneficial for line shape control. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the next stage of lifting the steel cage by the bridge crane in the third embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of a crane lifting a segment reinforcement cage;

[0046] Figure 3 Schematic diagram of crane transporting segment reinforcement cage;

[0047] Figure 4 Schematic diagram of the crane transferring the steel cage sling to the hanging basket;

[0048] Figure 5 Schematic diagram of the hanging basket lifting the steel cage into place;

[0049] Figure 6 Schematic diagram of moving the side formwork and bottom formwork of the hanging basket forward, installing the load-bearing hanger, transferring the original steel cage sling to the bridge crane, and returning the bridge crane to the bridge pier;

[0050] Figure 7 Schematic diagram of prestressing steel tendons for pouring concrete of N+1 beam segment;

[0051] Figure 8 It is a schematic diagram of a hanging basket lifting a segment steel cage in Embodiment 3 of the present invention;

[0052] Fig. 9 This is a schematic diagram of installing a load-bearing suspension rod on a hanging basket in Embodiment 3 of the present invention;

[0053] Fig.10 This is a schematic diagram of a bridge crane transporting a steel cage according to Embodiment 3 of the present invention;

[0054] Fig.11 This is a schematic diagram of the active running mechanism and track structure of the present invention;

[0055] Fig.12 It is a schematic diagram of the hanging basket lifting segment reinforcement cage in the first embodiment of the present invention.

[0056] Among them: 1 is a hanging basket, 2 is a bridge crane, 3 is a hanging basket side form and a bottom form, 4 is a steel cage for the segment to be assembled, 5 is a steel cage sling, 6 is a second running track, 7 is a first running track, 8 is an outer cantilever of the hanging basket, 9 is a main truss of the hanging basket, 10 is a distribution beam, 101 is a cross beam, 102 is a sling, 11 is a sling of the first hanging basket crane, 12 is a load-bearing hanger, 13 is a main truss of the bridge crane, 14 is an outer cantilever of the bridge crane, 15 is a running wheel of the bridge crane, 16 is a lifting winch of the bridge crane, 17 is a sling of the lifting winch of the bridge crane, 18 is a steel strand lock of the lifting winch of the bridge crane, 19 is a steel cage sling lock, 20 is a hanging basket sling lock, 21 is a sling of the second hanging basket crane, 22 is a motor, 23 is a roller, and 24 is a third running track. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] Embodiment 1

[0059] like Fig.12 As shown, this embodiment provides a construction device suitable for the integral hoisting of a cantilevered beam steel bar segment, comprising a hanging basket 1 and a hanging basket side form and a bottom form 3. The hanging basket main truss 9 of the hanging basket can be fixed to the cantilever beam end of the beam segment through an anchoring system. The hanging basket main truss 9 can be fixed to the cantilever beam end of the beam segment through an anchoring system and can move forward after the anchoring is released. The lower end of the hanging basket outer cantilever 8 is fixed with a first running track 7 (inside) and a second running track 6 (outside) extending along the longitudinal direction of the beam segment. The two sides of the hanging basket main truss 9 are respectively provided with a hanging basket outer cantilever 8, and the lower end of the hanging basket outer cantilever 8 is fixed with a first running track 7 and a second running track 6 extending along the longitudinal direction of the beam section, and the first running track 7 is matched with a first active running mechanism, and the first active running mechanism is provided with a first hanging basket crane, and the lower end of the sling 11 of the first hanging basket crane is connected to the hanging basket side mold and the bottom mold 3, and the second running track 6 is matched with a second active running mechanism, and the second active running mechanism is provided with a second hanging basket crane for lifting the segment steel cage 4 to be assembled.

[0060] A hanging basket crane needs to be installed on the first active running mechanism to hang the hanging basket side formwork and bottom formwork 3. When pouring the first section of a continuous beam in suspended pouring construction, the bottom formwork can be assembled on the ground first, or installed in the air, and then lifted into place by a hanging basket crane (also called a winch, which can be unified as a winch to avoid confusion with the bridge deck crane later). Then workers can install the side formwork on the bottom formwork. This process is a conventional step in suspended pouring construction. The hanging basket crane is a finished product, and the conventional process of continuous beam suspended pouring construction is attached later.

[0061] The second hanging basket crane can also be called a winch, and its function is to lift the structure by retracting and releasing the wire rope. Furthermore, the lower end of the sling 21 of the second hanging basket crane is connected to a distribution beam 10 for connecting to the segment steel cage 4 to be assembled; the distribution beam 10 includes a crossbeam 101 and a sling 102, the upper end of the sling is connected to the crossbeam, the lower end of the sling is connected to the segment steel cage 4 to be assembled, and the two ends of the crossbeam are respectively connected to the lower ends of the sling 21 of the second hanging basket crane on both sides of the hanging basket main truss 9. The length H2 of the crossbeam is greater than or equal to the spacing H1 between the second running rails on both sides of the hanging basket main truss.

[0062] Furthermore, the first running track 7 is arranged in parallel with the second running track 6, and the first running track 7 is located inside the second running track. The running track is I-shaped.

[0063] The active running mechanism includes a motor 22 and two rollers 23 arranged opposite to each other. The two rollers are rotatably mounted on a bracket, and the distance H4 between the opposite surfaces of the two rollers is less than the width H3 of the I-shaped running track. The two rollers are respectively located on both sides of the I-shaped running track, and the two rollers are supported and matched on the I-shaped running track. The motor 22 drives the rollers to rotate, and controls the active running mechanism to run along the running track.

[0064] Embodiment 2

[0065] like Fig.12 As shown, this embodiment discloses a construction method suitable for integrally hoisting a cantilever beam reinforcement segment, which adopts the construction device suitable for integrally hoisting a cantilever beam reinforcement segment of the first embodiment. The specific construction method includes the following steps:

[0066] The basket crane lifts the segment reinforcement cage at the front end of the cantilever and lifts the segment reinforcement cage into place;

[0067] The side molds and bottom mold 3 of the hanging basket slide forward into place;

[0068] Install the bearing hanger 12 when pouring concrete on the side and bottom forms;

[0069] Connect the new and old segment steel bars; pour concrete, tension prestressing, complete the segment assembly, repeat the cycle, and complete the assembly and pouring of the steel cages of all beam segments.

[0070] When the No. 0 block on the pier top is poured, the present invention generally builds some beams and other working platforms on the hanging basket crane, and then builds the side mold bottom mold on the working platform with the help of the bracket for the No. 0 block construction. This is a conventional construction process. When the steel cage is directly hoisted and spliced, it is enough to move forward to the front of the side mold bottom mold. It is mainly to avoid two vertical directions.

[0071] Embodiment 3

[0072] like Figures 1 to 11As shown, the present embodiment provides a construction device suitable for the integral lifting of a cantilevered beam steel bar segment, comprising a hanging basket 1, a hanging basket side formwork and a bottom formwork 3, a bridge deck crane 2 and a steel cage sling 5, wherein the hanging basket main truss 9 is fixed to the cantilever beam end of the beam segment, and a hanging basket outer cantilever 8 is respectively arranged on both sides of the hanging basket main truss 9 of the hanging basket, and a first running track 7 and a second running track 6 extending along the longitudinal direction of the beam segment are fixed to the lower end of the hanging basket outer cantilever 8, the first running track 7 is matched with a first active running mechanism, the first active running mechanism is provided with a first hanging basket crane, the lower end of the sling 11 of the first hanging basket crane is connected to the hanging basket side formwork and the bottom formwork 3, the second running track 6 is matched with a second active running mechanism, the second active running mechanism is provided with a second hanging basket crane, which is used to lift the steel cage 4 of the segment to be assembled. The bridge crane comprises a main truss 13 of the bridge crane, the lower end of which is provided with a running wheel 15 of the bridge crane, which cooperates with a track provided on the bridge deck, and two sides of the main truss 13 of the bridge crane are provided with outer cantilevers 14 of the bridge crane respectively, and the lower end of the outer cantilever 14 of the bridge crane is provided with a third running track 24, and the third running track 24 is cooperated with a hoisting winch 16 of the bridge crane, and the hoisting winch 16 of the bridge crane is provided with a bridge crane The lifting winch cable 17, the lower end of the bridge crane lifting winch cable 17 is connected with the bridge crane lifting winch cable 17 lock (steel strand), the lower end of the steel cage cable 5 is connected with the segment steel cage 4 to be assembled, the lower end of the cable 21 of the second hanging basket crane is connected with the hanging basket cable lock 20, the upper end of the steel cage cable 5 is connected with the steel cage cable lock 19, which is used to be buckled with the bridge crane lifting winch cable 17 lock or the hanging basket cable lock 20.

[0073] A running track is also provided at the lower end of the outer cantilever 14 of the bridge crane. When the bridge crane transports the segment steel cage and moves to the vicinity of the main truss 9 of the hanging basket, it cannot move forward because the main truss 9 occupies a certain position. Therefore, the slings hanging the steel cage are allowed to move forward through the slide rail at the lower end of the cantilever. The slings under the outer cantilever 8 of the hanging basket retreat to the vicinity of the slings of the bridge crane, so that the two slings can be locked and unlocked again.

[0074] Furthermore, the lower end of the steel cage sling 5 is connected with a distribution beam 10 for connecting with the segment steel cage 4 to be assembled; the distribution beam 10 includes a crossbeam and a sling, the upper end of the sling is connected to the crossbeam, the lower end of the sling is connected to the segment steel cage 4 to be assembled, and the two ends of the crossbeam are respectively connected with the steel cage sling 5. The length H2 of the crossbeam is greater than or equal to the spacing H1 between the third running tracks on both sides of the main truss of the bridge deck crane.

[0075] Furthermore, the first running track 7 is arranged in parallel with the second running track 6, and the first running track 7 is located inside the second running track.

[0076] Embodiment 4

[0077] like Figures 1 to 11 As shown, this embodiment discloses a construction method suitable for integrally hoisting a cantilever beam reinforcement segment, which adopts the construction device suitable for integrally hoisting a cantilever beam reinforcement segment of the third embodiment. The specific construction method includes the following steps:

[0078] 1) Transport the prefabricated segment steel cage to the set position (such as the pier); the bridge crane lifts the segment steel cage at the set position;

[0079] 2) The bridge crane transports the segment steel cage to the hanging basket at the front end of the cantilever beam;

[0080] 3) The bridge crane transfers the segment steel cage to the second hanging basket crane;

[0081] 4) The second hanging basket crane lifts the segment reinforcement cage into place.

[0082] 5) The side form and bottom form 3 of the hanging basket are moved forward to their positions, and the bearing hanger 12 for pouring concrete of the side form and bottom form is installed;

[0083] 6) Connect the new and old segment steel cages; the steel bars of the previous segment (already cast) are the old segment steel cages, and the segment steel cage to be constructed is the new segment steel cage;

[0084] 7) Pour concrete and tension prestress to complete the assembly of the segment. Repeat this cycle to complete the assembly and pouring of the steel cages of all beam segments.

[0085] After the construction of Block No. 0 on the top of the pier is completed and in preparation for the construction of the first section, two horizontal beams are hoisted and small longitudinal beams are placed on top to form a working platform on which workers can build the side and bottom formwork.

[0086] Furthermore, the bridge crane transfers the segment steel cage to the second basket crane of the basket, specifically including: hooking the basket sling buckle 20 with the steel cage sling buckle 19, and then unhooking the bridge crane hoisting winch cable buckle 18 from the steel cage sling buckle 19, so as to realize the transformation of the segment steel cage from being carried by the bridge crane to being carried by the basket.

[0087] Furthermore, step 5) also includes the following steps: transferring the steel cage sling 5 to the bridge crane, and the bridge crane returns to the set position; transferring the steel cage sling 5 to the bridge crane, specifically including: hooking the bridge crane lifting winch cable lock 18 with the steel cage sling cable lock 19, unhooking the hanging basket cable lock 20 from the steel cage sling lock 19, and removing the connection between the steel cage sling 5 and the segment steel cage.

[0088] Furthermore, step 4) also includes the following steps: the second active running mechanism drives the segment reinforcement cage to slide along the second running track 6 to the front end in place.

[0089] The segmented steel cage of the present invention can be prefabricated in a factory or can be bundled on site.

[0090] When the site is open, the steel cage can be directly transported to the section to be assembled on the ground; when the site is limited, it can be bundled together at the bottom of the pier, and the steel cage can be lifted to the front end of the cantilever by the crane running back and forth on the bridge deck. The hanging basket is always at the front end of the cantilever, and the hanging basket steel cage sling 5 and the side form bottom form sling use their own independent running systems. After the hanging basket lifts the steel cage into place, the side form bottom form extends out to complete the connection of the steel bar joint, the inner form extends out, concrete is poured, and prestressing is applied. In order to reduce the deflection of the steel bars extending out of the joint during the installation of the steel cage, measures should be taken to shorten the length of the joint as much as possible, and the steel bars at the joint can be completed in a U shape. After the load-bearing hanger is installed on the hanging basket side form bottom form, the original steel cage sling 5 is passed to the bridge deck crane, and the bridge deck crane can return to transport the next section of the steel cage.

[0091] When the concrete steel cage segments of the present invention are suspended and assembled, two schemes can be adopted for the transportation of the beam segments: 1) A lifting station is set up at the pier position, and the segments are lifted to the bridge deck and then transported to the hanging basket at the front end of the cantilever through the bridge deck crane. 2) The crane can move back and forth, and the bridge deck crane moves back to the pier position to take the beam-->lift it to the bottom of the beam-->the crane moves forward-->the crane transfers the steel cage to the hanging basket--->the longitudinal steel bars of the two adjacent segments are aligned (the steel bars of the segment that has been constructed are aligned with the newly hoisted steel cage, and the steel bars of the two segments must be connected together), the steel bar joints are connected, concrete is poured, and prestressing is applied to complete the segment assembly, and the cycle is repeated to complete the assembly and pouring of the steel cages of all beam segments.

[0092] When casting a section, adjacent steel bars need to be connected together. During construction, the longitudinal steel bars will extend out of a section outline, so that after casting this section, the longitudinal steel bars have joints exposed outside and connected to the longitudinal steel bars of the next section. Therefore, the newly hoisted steel cage must be aligned with the cast steel cage of the previous section, that is, the longitudinal steel bars must be aligned.

[0093] When the segmental steel cage is suspended, the transportation plan of the steel cage is as follows: the hanging basket is located at the end of the cantilever beam, and the bridge crane is equipped with an independent track for its round trip operation. The bridge crane lifts the segmental steel cage at the pier and transports it to the hanging basket for installation. The specific steps are: the bridge crane vertically lifts the steel cage to the bottom of the beam---> the bridge crane moves longitudinally to the front end of the cantilever beam and hangs the basket---> the third running track 24 of the outer cantilever 14 of the bridge crane is docked with the second running track 6 of the hanging basket, and the sling roller moves to the hanging basket to complete the steel cage transfer---> the main truss 9 of the hanging basket moves forward, and the side mold and bottom mold are anchored in the cast beam body---> the main truss 9 of the hanging basket is anchored, and the steel cage is lifted to the position---> the side mold and bottom mold are unanchored, the side mold and bottom mold of the hanging basket move forward, the load-bearing hanger 12 is installed, and the steel bars and prestressed channels are connected. The main truss does not need to move during the movement of the side form bottom form. Here, the side form bottom form does not need to extend out of the poured beam section first, but stays in its original position to avoid the lifting space of the steel cage. The side form bottom form moves toward the track on the inner side of the outer cantilever 8 of the hanging basket through the sling. This step is to prevent the side form bottom form from blocking the lifting channel of the steel cage. Since the side form bottom form is larger than the steel cage, the steel cage is lifted into place first, and then the side form bottom form is lifted. The original steel cage sling 5 is transferred to the bridge crane, and the bridge crane returns to the bridge pier---> the inner mold moves forward, concrete is poured, and prestressing is applied to complete the assembly of the segment, and the cycle is repeated to complete the assembly and pouring of the steel cages of all beam sections.

[0094] The interior of the box beam is hollow, and an inner mold is needed for pouring. That is, when pouring concrete into the box beam, the side mold, bottom mold, and inner mold are needed to make the outline. The conventional construction process is to first extend the side mold and bottom mold, and then the workers tie the steel cage on it, and then extend the inner mold, and then pour the concrete.

[0095] The outer cantilever running rail of the bridge crane is butted against the second running rail of the basket, so that the slings of the bridge crane and the basket are at basically the same distance from the center of the bridge deck, and the transverse bridge is in a similar position, making it convenient for the two to be locked and unlocked.

[0096] 3. The hanging basket hoists the steel cage and the side formwork bottom formwork, and two independent tracks are set up respectively. When hoisting the steel cage, the side formwork bottom formwork leaves space for lifting the steel cage. After the steel cage is in place, the side formwork bottom formwork is slid forward. Because the steel cage and the side formwork are light, slings are used when they are hoisted separately. Before pouring concrete, the hanging basket load-bearing suspender rod needs to be installed. The bridge deck crane is set up with an independent track for its round-trip operation.

[0097] 4. Steel bar joints can be made by: 1) lap welding and bar welding, which are used for steel bars with smaller diameters. 2) sleeve mechanical connection. Before connecting the steel bar joint, the stirrups at the connection are moved to the nearby sides and restored to their original positions after the connection is completed.

[0098] 5. The steel bar joints that extend beyond the length of the beam section can be bent into a U shape to reduce the downward deflection during the assembly process.

[0099] 6. It is suitable for work sites with limited transportation conditions under bridges. If the transportation conditions are available under the bridge, the bridge crane can be omitted, and the steel cage can be transported from the ground to the vicinity of the front end of the cantilever and then directly lifted by the hanging basket crane; otherwise, it can be lifted from the pier position and transported to the hanging basket by the bridge crane. Then, the lock of the bridge crane can be unlocked and the lock of the steel cage sling 19 on the hanging basket can be fastened to realize the transfer of the steel cage from the bridge crane to the hanging basket. The force conversion of the steel cage can also be realized by other means.

[0100] 7. It can be applied to single-box single-chamber and single-box multi-chamber, and has no requirement on the thickness of the cantilever plate of the box beam. It can be applied to any cross-section of highway and railway box beams.

[0101] 8. When transporting the steel cage of the beam section, there are two options for the transport: 1) hydraulic travel system. 2) cable traction system.

[0102] 9. During the lifting and transportation of the beam section reinforcement cage, vibration-damping cables can be installed to reduce wind-induced vibration.

[0103] The present invention can realize the hoisting construction of the entire segment of steel bars for cantilever cast beams of various highway and railway cross-section forms, and can adapt to various terrain conditions and inconvenient transportation conditions under bridges, can greatly speed up the overall construction progress of cantilever cast beams by about 30%, and the construction quality is more guaranteed than high-altitude binding, and has strong competitiveness. The present invention is a prefabricated cantilever assembly construction method of segment steel cages suitable for high-pier large-span continuous rigid frame bridges or continuous beams, with a wide range of applications, and can be applied to various bridge locations with limited transportation conditions under bridges, such as V-shaped canyon areas, land with limited transportation conditions, tidal flat areas that are not convenient for segment transportation, etc. It can also be used for the hoisting construction of the entire segment of steel bars for cantilever cast beams of various highway and railway cross-section forms, which can greatly speed up the overall construction progress of cantilever cast beams by about 30%, and the construction quality is more guaranteed than high-altitude binding, and has strong competitiveness.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction device suitable for integrally hoisting steel bar segments of cantilevered beams, characterized in that: It includes a hanging basket main truss and a hanging basket side form and a bottom form. The hanging basket main truss is fixed to the cantilever beam end of the beam section through an anchoring system. The two sides of the hanging basket main truss are respectively provided with hanging basket outer cantilevers. The lower ends of the hanging basket outer cantilevers are fixed with a first running track and a second running track extending along the longitudinal direction of the beam section. The first running track is matched with a first active running mechanism. The first active running mechanism is provided with a first hanging basket crane. The lower end of the sling of the first hanging basket crane is used to lift the hanging basket side form and the bottom form. The second running track is matched with a second active running mechanism. The second active running mechanism is provided with a second hanging basket crane, which is used to lift the steel cage of the segment to be assembled. The lower end of the sling of the second hanging basket crane is connected with a distribution beam for connecting with the steel reinforcement cage of the segment to be assembled; The sling is connected with the lifting gear of the lifting hoist of the bridge deck crane at the bottom end, and the sling is connected with the lifting gear of the lifting hoist of the bridge deck crane at the bottom end, and the sling is connected with the lifting gear of the lifting hoist of the bridge deck crane at the bottom end, and the sling is connected with the lifting gear of the lifting hoist of the bridge deck crane at the bottom end, and the sling is connected with the lifting gear of the lifting hoist of the bridge deck crane at the bottom end, and the sling is connected with the lifting gear of the lifting hoist of the bridge deck crane at the bottom end, and the sling is connected with the lifting gear of the lifting hoist of the bridge deck crane at the bottom end, and the sling is connected with the lifting gear of the lifting hoist of the bridge deck crane at the bottom end, and the sling is connected with the lifting gear of the lifting hoist of the bridge deck crane at the bottom end, and the sling is connected with the lifting gear of the lifting hoist of the bridge deck crane at the bottom end, and the sling is connected with the lifting gear of the lifting hoist of the bridge deck crane at the bottom end, and the sling is connected with the lifting gear of the lifting hoist of the bridge deck crane at the bottom end.

2. The construction device for integrally hoisting steel bar segments of cantilever beams according to claim 1 is characterized in that: The distribution beam includes a crossbeam, on which a sling is provided. The upper end of the sling is connected to the crossbeam, and the lower end of the sling is connected to the steel cage of the segment to be assembled. The two ends of the crossbeam are respectively connected to the lower ends of the slings of the second hanging basket crane on both sides of the main truss of the hanging basket; the length H2 of the crossbeam is greater than or equal to the spacing H1 between the second running rails on both sides of the main truss of the hanging basket.

3. The construction device for integrally hoisting steel bar segments of cantilever beams according to claim 1 is characterized in that: The first running track is arranged in parallel with the second running track, and the first running track is located inside the second running track.

4. The construction device for integrally hoisting steel bar segments of cantilever beams according to claim 1 is characterized in that: The lower end of the steel cage sling is connected to a distribution beam for connecting to the steel cage of the segment to be assembled; the distribution beam includes a crossbeam, on which a sling is provided, the upper end of the sling is connected to the crossbeam, the lower end of the sling is connected to the steel cage of the segment to be assembled, and the two ends of the crossbeam are respectively connected to the lower ends of the slings of the second hanging basket crane on both sides of the main truss of the hanging basket; the length H2 of the crossbeam is greater than or equal to the spacing H1 between the third running tracks on both sides of the main truss of the bridge deck crane.

5. A construction method suitable for integrally hoisting steel bar segments of cantilever beams, characterized in that: A construction device suitable for integrally hoisting a cantilever beam reinforcement segment as claimed in any one of claims 1 to 4 is used, and the specific construction method comprises the following steps: 1) The bridge crane lifts the segment reinforcement cage at the set position; 2) The bridge crane transports the segment steel cage to the hanging basket at the front end of the cantilever beam; 3) The bridge crane transfers the segment steel cage to the second hanging basket crane; 4) The second hanging basket crane lifts the segment reinforcement cage into place; 5) Move the side form and bottom form of the hanging basket forward to their positions, install the load-bearing hangers for pouring concrete on the side form and bottom form, and connect the new and old segment steel cages; 6) Pour concrete and tension prestress to complete the assembly of the segment. Repeat this cycle to complete the assembly and pouring of the steel cages of all beam segments.

6. The method according to claim 5, characterized in that: The bridge crane transfers the segment steel cage to the second basket crane of the basket, which specifically includes: hooking the basket sling cable lock with the steel cage sling cable lock, and then unhooking the bridge crane hoisting winch cable lock and the steel cage sling cable lock, so that the segment steel cage is transferred from the bridge crane to the basket.

7. The method according to claim 5, characterized in that: Step 5) also includes the following steps: transferring the steel cage sling to the bridge crane, and the bridge crane returns to the set position; transferring the steel cage sling to the bridge crane, specifically including: hooking the bridge crane lifting winch cable lock with the steel cage sling cable lock, unhooking the basket cable lock with the steel cage cable lock, and removing the connection between the steel cage sling and the segment steel cage.

8. The method according to claim 5, characterized in that: Step 4) also includes the following steps: the second active running mechanism drives the segment reinforcement cage to slide along the second running track to the front end in place.

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