Guide-beam-free steel bridge incremental launching construction structure

Abstract

The utility model discloses a steel bridge pushing construction structure without a guide beam. A pushing mechanism is arranged on piers, a traction platform is erected on the right side of an approach bridge, a supporting block and a sliding rail are installed above the top of each pier, each section of steel beam mechanism is spliced on the pier of the approach bridge section by section, and the right end of the steel beam mechanism is connected with a winch through a guide steel cable. A winch is installed at the upper end of the traction platform, and a guide steel cable connected with an anchoring device at the right end of the steel beam is arranged on the winch. In order to prevent the pushing front end from transverse distortion in the pushing process, transverse supports are additionally arranged at the positions of an upper flange plate and a lower flange plate of a steel box beam in the steel beam mechanism. The guide steel cable is designed at the right end of the steel box girder for reinforcing and guiding, so that guide-beam-free incremental launching construction is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge construction, and particularly relates to a steel bridge incremental launching construction structure without a guide beam. Background Technique

[0002] At present, the installation construction of steel box girders of long-span steel bridges mostly adopts construction methods such as the continuous incremental launching method with a guide beam, the integral hole-by-hole installation method with a bridge erecting machine, the bracket installation method, and the large-section steel beam hoisting and installation method. From the comparison of the applicability of the above common construction methods under mountainous conditions, it can be seen that for the construction of assembled composite beam steel bridges in mountainous areas with relatively inconvenient traffic organization conditions and terrain conditions, both the incremental launching method with a guide beam and the integral hole-by-hole installation method with a bridge erecting machine have good terrain applicability and construction period efficiency. However, due to the specificity of the guide beam and the bridge erecting machine, the standardization degree of their construction methods is relatively insufficient. Due to the rapid increase in the rental cost of the bridge erecting machine, the comprehensive economy and applicability of the incremental launching method with a guide beam have been superior to the integral hole-by-hole installation method with a bridge erecting machine. However, the traditional incremental launching method with a guide beam has problems such as long construction period occupied by the installation and removal of the guide beam, non-universality of the guide beam, and high safety risks in high-altitude operations. Content of the Utility Model

[0003] The main purpose of the utility model is to provide a steel bridge incremental launching construction structure without a guide beam, and the specific technical solution is as follows:

[0004] A steel bridge incremental launching construction structure without a guide beam, comprising an incremental launching mechanism, a traction mechanism, and a steel beam mechanism;

[0005] The incremental launching mechanism includes a first connecting plate, a second connecting plate, a support block, a cushion block, and an incremental launching device;

[0006] The second connecting plate and the support block are both arranged on the upper end surface of the first connecting plate;

[0007] The second connecting plate is in a semi-frame shape, the support blocks are arranged on both sides of the second connecting plate, and the second connecting plate and the support blocks are fastened by a reinforcement frame;

[0008] The support block and the first connecting plate are fixed by an L-shaped connecting plate;

[0009] The incremental launching device is arranged inside the frame of the second connecting plate;

[0010] The incremental launching device consists of an incremental launching machine and a walking jack;

[0011] The incremental launching machine is arranged on one side inside the frame of the second connecting plate, and two symmetrical slide rails are arranged on the end surface of the other side inside the frame. Grooves are arranged on the top surface of the slide rails, and a plurality of teeth are arranged at equal intervals in the grooves;

[0012] The cushion block is arranged on the slide rail, and the walking jack is arranged on the cushion block;

[0013] The pushing machine and the cushion block are connected by bolts; the pulley is arranged at the top end of the walking jack;

[0014] The pushing device is fixed on the top surface of the pier through the first connecting plate;

[0015] The number of piers is set according to the actual project. According to the direction of the pier arrangement, the first pier is the approach bridge, and the traction mechanism is arranged behind the last pier;

[0016] The steel beam mechanism includes a steel box girder and transverse supports. Transverse supports are arranged horizontally inside the steel box girder, and the transverse supports and the steel box girder are connected by bolt anchoring;

[0017] The traction mechanism includes a winch, a traction platform, and a guiding steel cable; the winch is installed above the traction platform, and a guiding steel cable for anchoring connection with the right end of the steel beam mechanism is arranged on the winch;

[0018] The guiding steel cables all pass through the pulleys installed at the top ends of the walking jacks on the piers;

[0019] The construction is carried out by using the pushing structure process without a guiding beam. The pushing direction is from left to right according to the pier arrangement. The traction mechanism is arranged at the right end of the steel beam mechanism, the pushing machine mechanism is arranged on each pier, the traction platform is built on the right side of the approach bridge, and then each section of the steel beam mechanism is assembled section by section on the approach bridge piers. Connect the traction point and the winch with the guiding steel cable, and then the pushing construction of the steel bridge can be started. The steel beam mechanism is lifted by the walking jack, and the pushing machine realizes the pushing of the steel beam mechanism.

[0020] In the preferred scheme of the steel bridge pushing construction structure without a guiding beam, the transverse supports are arranged in a cross-oblique direction.

[0021] In the preferred scheme of the steel bridge pushing construction structure without a guiding beam, guiding steel cables are connected between adjacent piers. After the steel bridge to be pushed reaches a certain pier, one end of the guiding steel cable is anchored on the steel beam mechanism by an anchor, and the other end of the guiding steel cable is connected with the winch on the traction platform through a pulley for reinforcement and guidance, realizing the pushing construction without a guiding beam.

[0022] In the preferred scheme of the steel bridge pushing construction structure without a guiding beam, two guiding steel cables are laid symmetrically along the longitudinal center line direction of the approach bridge. The left end of each guiding steel cable is fixed and connected with the steel beam mechanism through an anchor cable fixator, and the right end is connected with the winch above the traction platform through a pulley. The winch can make the guiding steel cable freely stretch, ensuring the accurate pushing direction of the steel beam mechanism and realizing the self-balance of the force between piers during the pushing process of the steel beam.

[0023] For the described steel bridge incremental launching construction structure without a guide beam, the preferred solution is that the pulley needs to be removed every time the steel beam mechanism is launched a certain distance. The timing for pulley removal is when the right end of the steel beam mechanism reaches above the pulley.

[0024] The construction method using the described steel bridge incremental launching construction structure without a guide beam is as follows:

[0025] Step 1: Erection of the traction mechanism

[0026] The traction platform is a truss structure welded by steel pipes, cross beams, cushion beams, horizontal braces, and diagonal braces, with winch traction facilities arranged on it;

[0027] Step 2: Design of the incremental launching mechanism

[0028] According to the construction requirements, the equipment during incremental launching construction should meet a maximum vertical bearing capacity of 150t, and have a certain vertical adjustment ability and horizontal deviation correction ability during the incremental launching construction process;

[0029] Use a 320-ton incremental launching machine for incremental launching construction; the walking jacks are located on the sliding rails, with support blocks on both sides of the walking jacks. The walking jacks lift the steel beam mechanism, and the incremental launching machine realizes the incremental launching of the steel box. During the incremental launching process, the sliding surface is inside the incremental launching equipment, without generating horizontal force on the structure;

[0030] Step 3: Installation of the sliding rails

[0031] The sliding rails on the piers are set as continuous, with two sets arranged longitudinally. It is required that the elevation difference between all adjacent transverse sliding ways is consistent with the design, and the sliding ways for vertical curve incremental launching are required to be within an ideal circular arc curve;

[0032] All sliding ways must be adjusted to be parallel to the incremental launching track before installation to ensure that there is surface contact between the steel box girder and the walking jacks during the incremental launching process. The control requirements for the elevation and levelness of the sliding ways during incremental launching are high, and no errors and excessive measurement errors are allowed;

[0033] To prevent the end of the walking jack from detaching from the sliding rail during incremental launching, support blocks are set at both ends of the second connecting plate;

[0034] Step 4: Erection of the guiding steel cables

[0035] Two guiding steel cables are set between the piers of each span. After the incremental launching mechanism reaches the Nth pier, the guiding steel cables are anchored at the right end of the steel beam mechanism using cable anchor holders, the guiding steel cables are tensioned at the tensioning end of the traction platform, the guiding steel cables are anchored at the right end of the guiding steel cables using winches, and the guiding steel cables are fixed at the top of each pier through pulleys to reinforce and guide the incremental launching process of the steel beam, realizing incremental launching construction without a guide beam;

[0036] Step 5: Removal of the pulleys

[0037] After each pushing distance, the pulley needs to be removed. The timing for removing the pulley is when the steel beam mechanism reaches above the pulley, and the depth of each slide rail is guaranteed to ensure the stability of the steel beam.

[0038] Beneficial Effects

[0039] Compared with the prior art, the utility model can be more conducive to the control of the pushing direction during the pushing process by designing a guide steel cable in the steel box beam. In addition, the steel bridge structure itself is used as a guide beam, and the guide beam does not need to be removed in the later stage of construction. At the same time, the bridge deck construction can be carried out while pushing. In summary, the steel bridge without a guide beam can not only fully reduce the workload of high-altitude operations, reduce the operating risks of construction personnel, improve the accuracy of steel bridge pushing, but also increase the construction speed. In addition, a support is set between the steel box beams in the horizontal direction to increase the lateral stiffness of the steel box beam to prevent large lateral deformation of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of a top-pushing construction structure of a steel bridge without a guide beam provided by an embodiment of the utility model;

[0041] Figure 2 A schematic diagram of a push-up structure provided in an embodiment of the utility model;

[0042] Figure 3 It is a schematic diagram of the steel beam jacking process in the engineering case of this utility model.

[0043] Among them: 1. Steel box girder; 2. Winch; 3. Guide steel cable; 4. Towing platform; 5. Approach bridge; 6. Pier; 7. The last pier; 8. Anchor; 9. First connecting plate; 10. L-shaped connecting plate; 11. Support block; 12. Pusher; 13. Walking jack; 14. Reinforcement frame; 15. Slide rail; 16. Groove; 17. Second connecting plate; 18. Horizontal support; 19. Bridge deck; 20. Pulley; 21. Pad. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "lateral", "width", "upper", "lower", "left side", "right side", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0046] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0047] As Figures 1-3 shown, a steel bridge jacking construction structure without a guide beam includes a jacking mechanism, a traction mechanism, and a steel beam mechanism;

[0048] The jacking mechanism includes a first connecting plate 9, a second connecting plate 17, a support block 11, a cushion block 21, and a jacking device;

[0049] Both the second connecting plate 17 and the support block 11 are arranged on the upper end surface of the first connecting plate 9;

[0050] The second connecting plate 17 is in a semi-frame shape, the support blocks 11 are arranged on both sides of the second connecting plate 17, and the second connecting plate 17 and the support block 14 are fastened together through a reinforcing frame 14;

[0051] The support block 11 and the first connecting plate are fixed through an L-shaped connecting plate 10;

[0052] The jacking device is arranged inside the frame of the second connecting plate 17;

[0053] The jacking device is composed of a jacking machine 12 and a walking jack 13;

[0054] The jacking machine 12 is arranged on one side inside the frame of the second connecting plate 17. On the end surface of the other side inside the frame, there are two symmetrical slide rails 15, and a groove 16 is provided on the top surface of the slide rail 15, and a plurality of teeth are arranged at equal intervals in the groove 16;

[0055] The cushion block 21 is arranged on the slide rail 15, and the walking jack 13 is arranged on the cushion block 21;

[0056] The jacking machine 12 and the cushion block 21 are connected by bolts; a pulley 20 is arranged at the top end of the walking jack 13;

[0057] The jacking device is fixed on the top surface of the pier 6 through the first connecting plate 9;

[0058] The number of bridge piers is determined according to the actual project. According to the direction of the bridge pier arrangement, the first bridge pier is the approach bridge 5, and the traction mechanism is arranged behind the last bridge pier 7;

[0059] The steel beam structure comprises a steel box beam 1 and a transverse support 18. The transverse support 18 is arranged transversely in the steel beam box 1, and the transverse support 18 is connected to the steel beam box 1 by bolt anchoring.

[0060] The traction mechanism includes a winch 2, a traction platform 4, and a guide steel cable 3; the winch 2 is installed above the traction platform 4, and the winch 2 is provided with a guide steel cable 3 anchored and connected to the right end of the steel beam mechanism;

[0061] The guide cables 3 all pass through the pulley 20 installed on the top of the walking jack 13 on the pier 6;

[0062] The jacking structure construction process without a guide beam is adopted. The jacking direction is set from left to right according to the bridge pier 6. The traction mechanism is set at the right end of the steel beam mechanism. The jacking machine mechanism is set on each bridge pier. The traction platform is set up on the right side of the approach bridge. Then, the steel beam mechanism of each segment is assembled section by section on the bridge pier 5 of the approach bridge. The traction point and the winch 2 are connected by the guide steel cable 3, and the jacking construction of the steel bridge can be started. The steel beam mechanism is jacked up by the walking jack 13, and the jacking machine 12 realizes the jacking of the steel beam mechanism.

[0063] The transverse supports 18 are arranged in a cross-oblique manner.

[0064] A guide steel cable 3 is connected between each adjacent pier 6. After the steel bridge is pushed to a certain pier 6, one end of the guide steel cable 4 is anchored on the steel beam mechanism by using an anchor 8, and the other end of the guide steel cable 3 is connected to the winch 2 on the traction platform 4 through a pulley 20 for reinforcement and guidance, thereby realizing guide beam-free pushing construction.

[0065] Two guide steel cables 3 are laid symmetrically along the longitudinal center line of the approach bridge 5, and the left end of each guide steel cable 3 is fixed to the steel beam mechanism through an anchor 8, and the right end is connected to the winch 2 above the traction platform 4 through a pulley 20. The winch 2 can make the guide steel cables 3 freely extend and retract, ensuring the accurate pushing direction of the steel beam mechanism and achieving self-balancing of the force between the piers 6 during the pushing process of the steel beam.

[0066] The pulley 20 needs to be removed every time the steel beam mechanism is pushed out a certain distance, and the timing for removing the pulley 20 is when the right end of the steel beam mechanism reaches above the pulley 20 .

[0067] The following will explain in detail the steel beam pushing process of this application scheme in combination with specific engineering cases:

[0068] The pushing length of this approach bridge is 160m, with a total of 4 spans, each span is 42m; that is, it is divided into 4 pushing rounds, each round pushing 40m, and each pushing of a segment is considered a construction step, and the subsequent steel beam segments are installed according to this step.

[0069] Prefabricated bridge deck components are prefabricated and stored in the bridge deck processing area, and then transported to the bridge deck by transport vehicles for installation span by span.

[0070] See also Figure 3 The jacking process of the steel bridge includes the following steps:

[0071] Step 1: Lifting the traction mechanism for pushing and installing the pushing mechanism;

[0072] 1. Set up the traction platform bracket and complete the traction platform construction;

[0073] 2. Install the jacking mechanism on the bridge pier;

[0074] 3. Carry out corresponding stacking or trial lifting operations;

[0075] 4. Install the winch on the traction platform;

[0076] 5. Hoisting steel box girder;

[0077] Step 2: Install the guide steel cable on the installed steel box girder;

[0078] Step 3: Carry out the construction of steel box girder bridge deck concrete and crash wall, and reserve the rightmost span steel box girder for use as a guide beam without bridge deck construction;

[0079] Step 4: Carry out the first round of jacking to make the steel beam mechanism move forward one span as a whole, and the front end of the steel beam mechanism reaches the L3 bridge pier. After the jacking is completed, the H4 span steel beam mechanism is hoisted and the D3 section bridge deck 19 is constructed;

[0080] Step 5: Remove the pulley 20 above L4 and carry out the second round of jacking to make the steel beam mechanism move forward one span. The front end of the steel beam mechanism reaches the top of the L4 bridge pier. After the jacking is completed, the H5 and H6 span steel beam mechanisms are hoisted and the D4 and D5 bridge decks 19 are constructed.

[0081] Step 6: Remove the pulley 20 above L5, carry out the third wheel push, make the steel beam mechanism move forward one span as a whole, the front end of the steel beam mechanism reaches the top of the L5 pier, the steel beam mechanism reaches above the designed position, hoist the H6 span steel beam mechanism and carry out the construction of the D6 bridge deck 19;

[0082] Step 7: Set up temporary support on the pier top, install beam-dropping jacks, and perform beam-dropping operations, alternately dropping beams using jacks and support blocks;

[0083] Step 8: Carry out the construction of D7 section bridge deck 19 and steel guardrail, and dismantle the temporary traction mechanism.

[0084] For any of the technical solutions disclosed by the present utility model as described above, unless otherwise stated, if it discloses a numerical range, the disclosed numerical range is a preferred numerical range. Any person skilled in the art should understand that the preferred numerical range is only the numerical values with obvious technical effects or representativeness among many feasible numerical values. Since there are too many numerical values to enumerate, only some numerical values are disclosed by the present utility model to illustrate the technical solutions of the present utility model. Moreover, the numerical values listed above shall not constitute a limitation to the protection scope of the present invention.

[0085] Meanwhile, for the present utility model as described above, if it discloses or involves components or structural parts that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection, or can also be understood as: a non-detachable fixed connection. Of course, the mutual fixed connection can also be replaced by an integral structure.

[0086] In addition, for the terms used to represent the positional relationship or shape in any of the technical solutions disclosed by the present utility model as described above, unless otherwise stated, their meanings include states or shapes that are approximate, similar or close thereto. Any component provided by the present utility model can either be assembled from multiple separate components or be a single component manufactured by an integral forming process.

[0087] The above embodiments are only examples clearly illustrating the present utility model, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the embodiments here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present utility model.

Claims

1. A steel bridge top-pushing construction structure without a guide beam, characterized in that: It includes a pushing mechanism, a traction mechanism, and a steel beam mechanism; The pushing mechanism comprises a first connecting plate, a second connecting plate, a supporting block, a cushion block and a pushing device; The second connecting plate and the supporting block are both arranged on the end surface of the first connecting plate; The second connecting plate is in a semi-frame shape, the support blocks are arranged on both sides of the second connecting plate, and the second connecting plate and the support blocks are fastened by a reinforcement frame; The support block and the first connecting plate are fixed via an L-shaped connecting plate; The pushing device is arranged in the frame of the second connecting plate; The jacking device is composed of a jacking machine and a walking jack; The pusher is arranged on one side of the second connecting plate frame, and two symmetrical slide rails are arranged on the end surface of the other side frame, and a groove is arranged on the top surface of the slide rail, and a plurality of teeth are arranged at equal intervals in the groove; The cushion block is arranged on the slide rail, and the walking jack is arranged on the cushion block; The jacking machine is connected to the pad by bolts; the pulley is arranged on the top of the walking jack; The jacking device is fixed to the top surface of the pier through a first connecting plate; The number of bridge piers is determined according to the actual project. According to the direction of the pier arrangement, the first pier is the approach bridge, and the traction mechanism is set behind the last pier. The steel beam structure includes a steel box beam and a transverse support, wherein a transverse support is arranged transversely in the steel beam box, and the transverse support is connected to the steel beam box by bolt anchoring; The traction mechanism includes a winch, a traction platform, and a guide cable; The traction platform is a truss structure welded from steel pipes, cross beams, cushion beams, cross braces and diagonal braces; A winch traction facility is arranged above the traction platform, and the winch is provided with a guide steel cable anchored and connected to the right end of the steel beam mechanism; The guide cables all pass through pulleys installed on the top of the walking jacks on the bridge piers; The jacking structure construction process without a guide beam is adopted. The jacking direction is set from left to right according to the pier. The traction mechanism is set at the right end of the steel beam mechanism. The jacking machine mechanism is set on each pier. The traction platform is set up on the right side of the approach bridge. Then, the steel beam mechanism of each segment is assembled section by section on the pier of the approach bridge. The steel beam mechanism and the winch are connected by guide steel cables, and the jacking construction of the steel bridge can be started. The steel beam mechanism is lifted up by a walking jack, and the jacking machine realizes the jacking of the steel beam mechanism.

2. According to the guide beam-free steel bridge jacking construction structure of claim 1, it is characterized by: The lateral supports are arranged in a cross-oblique direction.

3. The guide beam-free steel bridge jacking construction structure according to claim 1, characterized in that: Guide steel cables are connected between adjacent bridge piers. After the steel bridge is pushed to a certain pier, one end of the guide steel cable is anchored on the steel beam mechanism by an anchor, and the other end of the guide steel cable is connected to the winch on the traction platform through a pulley for reinforcement and guidance, thus realizing guide beam-free pushing construction.

4. The guide beam-free steel bridge top-pushing construction structure according to claim 3 is characterized in that: The guide steel cables are laid continuously on each pier in a symmetrical direction along the longitudinal center line of the approach bridge, and the elevation difference of all adjacent slideways in the transverse direction is consistent with the design. The vertical curve jacking requires that the slideway is within an ideal circular arc curve; The left end of each guide steel cable is fixed to the steel beam mechanism through an anchor, and the right end is connected to the winch at the tensioning end above the traction platform through a pulley. The winch can make the guide steel cable retract freely to ensure the accurate pushing direction of the steel beam mechanism, realize the reinforcement of the guide during the steel beam pushing process and the self-balancing of the force between the piers during the steel beam pushing process.

5. The guide beam-free steel bridge jacking construction structure according to claim 1, characterized in that: The pulley needs to be removed every time the steel beam mechanism is pushed out a certain distance, and the timing for removing the pulley is when the right end of the steel beam mechanism reaches above the pulley.

6. The guide beam-free steel bridge jacking construction structure according to claim 1, characterized in that: According to the construction requirements, the equipment should meet the maximum vertical bearing capacity of 150t during jacking construction, and a 320-ton jacking machine should be used for jacking construction.

7. The guide beam-free steel bridge jacking construction structure according to claim 3, characterized in that: All slideways are adjusted to be parallel to the jacking trajectory before installation to ensure surface contact between the steel box girder and the walking jack during the jacking process. No errors or excessive measurement errors are allowed in the elevation and horizontality of the slideways during jacking.

Images