Ballast system suitable for pushing large cantilever steel beam and construction method thereof

Abstract

The invention provides a ballasting system suitable for pushing a large cantilever steel beam and a construction method thereof, two ballasting slide way beams are fixedly mounted on the tail part of the steel beam, two rows of multiple pairs of slide blocks in sliding fit with the two ballasting slide way beams are arranged on the two ballasting slide way beams, and a ballasting tray is supported and placed on the multiple pairs of slide blocks; a steel strand is arranged between the sliding block and the fixed anchoring jack in a penetrating mode, in the process of pushing the lengthened steel beam, a traction system formed by the steel strand, the sliding block and the weight tray enables the weight body to be in a braking state for preventing the weight body from moving in the pushing direction, and then the steel beam is pushed forwards by one section. The problem that in the prior art, the temporary pressing weight of the tail portion is too large during pushing construction of the steel beam large cantilever can be effectively solved, and the construction risk and the construction cost are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge engineering construction, and in particular relates to a weight pressing system suitable for jacking of a large cantilever steel beam and a construction method thereof. Background Art

[0002] When the steel beam is pushed forward, problems may occur when the temporary pier construction is difficult due to the limited space environment of the construction site and the bridge site. During the construction of the large cantilever steel beam, anti-overturning stability is a key issue. To prevent the steel beam from overturning during the pushing process, it is usually necessary to set a temporary weight at the tail of the steel beam.

[0003] On the one hand, when the large cantilever steel beam is pushed forward in the traditional method, the temporary weight configured at the tail of the steel beam will move forward as the pushing moves forward, thus causing the weight of the weight to increase significantly. When the steel beam is pushed forward under the premise of configuring a large weight, the difficulty of pushing and closing the joint increases, the steel beam is subjected to great force, and the construction risk is high. In addition, more weight materials, personnel and machinery are required, which is prone to waste of materials, while increasing the investment costs of personnel, materials and machinery, making it difficult to create greater economic benefits. In addition, after the steel beam is closed, it is difficult to dismantle the huge temporary weight, and it is even necessary to dismantle the weight in blocks one by one, which also increases the cost of personnel and machinery. In addition, during the removal of the weight, it is necessary to strictly follow the prescribed order and steps to ensure the safety and stability of each step of the operation, which has a great impact on the construction period.

[0004] On the other hand, in the traditional ballast method, in order to reduce the weight of the ballast, there is a process of reversing the ballast body. When a large weight ballast body is applied to the steel beam, the ballast position and weight must be re-determined each time it is reversed. This undoubtedly increases the difficulty and calculation of the ballast design, and also increases the complexity of the construction process and the difficulty of actual operation. It is difficult to ensure the construction progress, which easily leads to delays in the construction period. Summary of the invention

[0005] In view of this, the invention aims to overcome the defects of the prior art and provide a weight pressing system and construction method suitable for large cantilever jacking of steel beams, so as to solve the problem of excessive temporary weight pressing at the tail during large cantilever jacking construction of steel beams in the prior art, and at the same time reduce the construction risk and construction cost by applying this method.

[0006] A construction method suitable for top-pushing of large cantilever steel beams, comprising:

[0007] S1: Set up the assembly platform and pier-side brackets according to the design requirements, and install the jacking device and vertical jack in the assembly platform area and on the top of the permanent pier in the jacking construction area;

[0008] S2: transport the steel beam members to the construction site and assemble the first section of the steel beam at the assembly platform;

[0009] S3: Use the pushing device to push the assembled steel beam forward. The pushing distance can meet the assembly space of the next steel beam, and assemble the steel beam interval;

[0010] S4: Repeat step S3 until the anti-overturning capacity of the jacking steel beam reaches a critical state, and then install a dynamic sliding weight-bearing system at the tail of the steel beam. The dynamic sliding weight-bearing system includes two weight-bearing slide beams that are parallel to each other and whose length direction is parallel to the jacking direction and are fixedly installed on the tail of the steel beam. Two rows of multiple pairs of sliders that slide with the weight-bearing slide beams are arranged, and limit blocks are placed on both sides of each slider. A connecting rod is fixedly connected between two adjacent sliders on the same weight-bearing slide beam to ensure that the sliders slide synchronously. Finally, a weight-bearing tray is supported and placed on the multiple pairs of sliders; an anchor jack and a reaction seat are installed, and the anchor jack is fixed on the reaction seat. The reaction seat is fixed at a position outside the assembly platform area and away from the jacking direction, that is, the anchor jack is fixed at a position outside the assembly platform area and away from the jacking direction, and a steel strand is passed between the slider and the anchor jack, and one end of the steel strand is fixed to the slider, and the other end is not fixed to the anchor jack for the time being.

[0011] S5: adjusting the weight tray to an appropriate position through the sliding cooperation between the slider and the weight slideway beam, and then placing the weight body on the weight tray so that the weight body is located at a position to exert the weight function as required by the design;

[0012] S6: After the ballast body is installed, the anchor jack is fixed to it by clamping the steel strand, so that the anchor jack puts the ballast body into a braking state through the steel strand-slider-ballast tray, that is, preventing the ballast body from moving in the pushing direction, releasing the limit block, and then pushing the steel beam forward one section.

[0013] S7: Continue to assemble steel beams and extend the weight slideway beam; use the anchor jack to correct and lock the position of the weight body, and then place limit blocks on both sides of the slide; finally, adjust the weight of the weight body according to the design requirements.

[0014] S8: Repeat step S6.

[0015] S9: Repeat steps S7 and S8 until the steel beam is pushed into place, and place limit blocks on both sides of the slider, waiting for closure.

[0016] Preferably, in S4, when the slider is first placed, in addition to strictly controlling its position, it is also braked with a limit block to ensure the accuracy and stability of the installation position of the weight body; after the slider is installed and positioned, the adjacent sliders are rigidly connected along the bridge with connecting rods to ensure the synchronization of the slider sliding during the steel beam pushing process. Further, one connecting rod is provided on each side of the slider.

[0017] Preferably, the sliding block is firmly connected to the ballast tray.

[0018] Preferably, in S5, a displacement sensor is installed on the slider to strictly monitor the sliding condition of the slider during the steel beam pushing process, and the slider sliding displacement threshold is input into the control system in advance. When the actual displacement feedback from the displacement sensor reaches the threshold, the system alarms, and the alarm is lifted after the operator checks and solves the problem.

[0019] During the steel beam assembly and jacking process, the anchor jack always clamps the steel strand; the anchor jack is a continuous jack, which drives the movement of the weight body by pulling the steel strand, thereby achieving the purpose of deviation correction.

[0020] Preferably, lubrication measures are taken between the weighted slideway beam and the slider to reduce the friction between the slider and the slideway beam as much as possible.

[0021] During the steel beam pushing process, the pushing speed should be controlled within a safe range to avoid excessive dynamic load on the structure and ensure the stability of the weight body.

[0022] A weight-bearing system suitable for pushing a large cantilever steel beam, comprising:

[0023] Two weighted sliding beams are parallel to the pushing direction and are fixedly installed on the tail of the steel beam 6 respectively, and are extended in the direction opposite to the pushing direction when the steel beams are assembled and extended;

[0024] Two rows of multiple pairs of sliders are placed on two weight slide beams and slide with them respectively. A connecting rod is fixedly connected between two adjacent sliders on the same weight slide beam to ensure synchronous sliding of the sliders.

[0025] A weighted tray is supported and placed on multiple pairs of slides;

[0026] A ballast body, which is placed on the ballast tray;

[0027] Anchor jack and reaction seat, the anchor jack is fixed on the reaction seat, and the reaction seat is fixed outside the assembly platform area and away from the jacking direction;

[0028] A steel strand is passed between the slider and the anchor jack, one end of the steel strand is fixed to the slider, and the other end is pulled and clamped by the anchor jack.

[0029] The present invention can effectively solve the problem of excessive temporary pressure weight at the tail of a steel beam during large cantilever jacking construction in the prior art, thereby reducing construction risks and construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings that constitute a part of the present invention are used to provide further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 It is a schematic diagram of the relevant structure of step 1;

[0032] Figure 2 It is a schematic diagram of the structure related to step 2;

[0033] Figure 3 This is a schematic diagram of the relevant structure of step 3;

[0034] Figure 4 It is a schematic diagram of the relevant structure of step 4;

[0035] Figure 5 This is a schematic diagram of the relevant structure of step 5;

[0036] Figure 6 This is a schematic diagram of the relevant structure of step 6;

[0037] Figure 7 This is a schematic diagram of the relevant structure of step 7;

[0038] Figure 8 This is a schematic diagram of the relevant structure of step 8;

[0039] Fig. 9 This is a schematic diagram of the relevant structure of step 9;

[0040] Fig.10 A side view schematic diagram related to step 4;

[0041] Fig.11 It is a partially enlarged schematic diagram of the structure of the ballast system;

[0042] Fig.12 This is an enlarged schematic diagram of another part of the ballast system.

[0043] The reference numerals in the figure are: 1. assembly platform; 2. pier side bracket; 3. permanent pier; 4. jacking device; 5. vertical jack; 6. steel beam; 7. ballast slide beam; 8. slider; 9. limit block; 10. connecting rod; 11. ballast tray; 12. anchor jack; 13. reaction seat; 14. steel strand; 15. ballast body. DETAILED DESCRIPTION

[0044] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0045] S1: Figure 1 As shown, an assembly platform 1 and a pier-side bracket 2 are set up according to the design requirements, and a jacking device 4 and a vertical jack 5 are installed on the assembly platform area and the top of the permanent pier 3 located in the jacking construction area;

[0046] S2: Figure 2 As shown, the steel beam members are transported to the construction site, and the first section of the steel beam 6 is assembled at the assembly platform 1;

[0047] S3: Figure 3 As shown, the assembled steel beam 6 is pushed forward by the pushing device 4, and the pushing distance can meet the assembly space of the next steel beam, and the steel beam interval is assembled;

[0048] S4: Repeat step S3 until the anti-overturning capacity of the top-pushing steel beam reaches a critical state. Figure 4 , Fig.10 , Fig.11 As shown, a dynamic sliding weight-bearing system is installed at the tail of the steel beam 6, and the dynamic sliding weight-bearing system includes two weight-bearing slide beams 7 which are parallel to each other and whose length direction is parallel to the pushing direction, and two rows of multiple pairs of sliders 8 which slide with each other are arranged on the two weight-bearing slide beams 7, and limit blocks 9 are placed on both sides of each slider 8. A connecting rod 10 is fixedly connected between two adjacent sliders 8 on the same weight-bearing slide beam 7 to ensure that each slider slides synchronously, and finally a weight-bearing tray 11 is supported and placed on the multiple pairs of sliders 8; an anchor jack 12 and a reaction seat 13 are installed, as shown in FIG. Fig.12 As shown, the anchor jack 12 is fixed on the reaction seat 13, and the reaction seat 13 is fixed at a position outside the assembly platform 1 area and away from the jacking direction, that is, the anchor jack 12 is fixed at a position outside the assembly platform 1 area and away from the jacking direction, and a steel strand is passed between the slider 8 and the anchor jack 12, and one end of the steel strand 14 is fixed to the slider 8, and the other end is not fixed to the anchor jack 12 for the time being.

[0049] S5: Figure 5 As shown, the ballast tray 11 is adjusted to an appropriate position through the sliding cooperation between the slider and the ballast slide beam 7, and then the ballast body 15 is placed on the ballast tray 11 so that the ballast body 15 is located at a position to perform the ballast function as required by the design; a displacement sensor is installed on the slider 8.

[0050] S6: Figure 6As shown, after the ballast body 15 is installed, the anchor jack 12 is fixed to it by clamping the steel strand 14, so that the anchor jack 12 puts the ballast body 15 into a braking state via the steel strand-slider-ballast tray 11, i.e., preventing the ballast body 15 from moving in the pushing direction, releasing the limit block 9, and then pushing the steel beam 6 forward one section.

[0051] S7: Figure 7 As shown, continue to assemble the steel beams and extend the weight slideway beam 7; use the anchor jack 12 to correct and lock the position of the weight body 15, and then place the limit blocks 9 on both sides of the slide 8; finally, adjust the weight of the weight body 15 according to the design requirements.

[0052] S8: Figure 8 As shown, step S6 is repeated.

[0053] S9: Fig. 9 As shown, steps S7 and S8 are repeated until the steel beam 6 is pushed into place, and limit blocks 9 are placed on both sides of the slider, waiting for closure.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method suitable for pushing a large cantilever steel beam, characterized in that: include: S1: Set up the assembly platform and pier-side brackets, and install the jacking device and vertical jacks in the assembly platform area and on the top of the permanent pier in the jacking construction area; S2: Assemble the first section of steel beam at the assembly platform; S3: Use the pushing device to push the assembled steel beam forward. The pushing distance can meet the assembly space of the next steel beam, and assemble the steel beam interval; S4: Repeat step S3 until the anti-overturning capacity of the jacking steel beam reaches a critical state, and then install a weight system at the tail of the steel beam, wherein the weight system includes two weight slideway beams parallel to each other and whose length direction is parallel to the jacking direction, fixedly installed at the tail of the steel beam, and two rows of multiple pairs of sliders are arranged on the two weight slideway beams to slide with them, and a weight tray is supported and placed on the multiple pairs of sliders; the anchor jack is fixed outside the assembly platform area and away from the jacking direction, a steel strand is passed between the slider and the anchor jack, and one end of the steel strand is fixed to the slider, and the other end is not fixed to the anchor jack for the time being; S5: adjusting the weight tray to an appropriate position through the sliding cooperation between the slider and the weight slideway beam, and then placing the weight body on the weight tray so that the weight body is located at a position to exert the weight function as required by the design; S6: After the ballast body is installed, the anchor jack is fixed to it by clamping the steel strand, so that the traction system formed by the anchor jack through the steel strand, the slider and the ballast tray puts the ballast body in a braking state to prevent it from moving in the pushing direction, and then pushes the steel beam forward one bay; S7: Continue to assemble the steel beams and extend the weight slideway beams; use the anchor jack to correct and lock the position of the weight body; finally, adjust the weight of the weight body according to the design requirements; S8: repeat step S6; S9: Repeat steps S7 and S8 until the steel beam is pushed into place, and place limit blocks on both sides of the slider, waiting for closure.

2. A construction method suitable for top-pushing of a large cantilever steel beam as claimed in claim 1, characterized in that: In S4, when the slider is placed for the first time, in addition to strictly controlling its position, it is also braked using a limit block.

3. A construction method suitable for top-pushing of large cantilever steel beams as claimed in claim 2, characterized in that: After the sliders are installed and positioned, adjacent sliders along the bridge are rigidly connected with connecting rods.

4. A construction method suitable for top-pushing of a large cantilever steel beam as claimed in claim 3, characterized in that: A connecting rod is respectively arranged on both sides of the slide block.

5. A construction method suitable for top-pushing of a large cantilever steel beam as claimed in claim 1, characterized in that: In S4, the slider is tightly connected to the weighted tray.

6. A construction method suitable for top-pushing of a large cantilever steel beam as claimed in claim 1, characterized in that: In S5, a displacement sensor is installed on the slider to strictly monitor the sliding condition of the slider during the steel beam pushing process. The slider sliding displacement threshold is input into the control system in advance. When the actual displacement feedback from the displacement sensor reaches the threshold, the system alarms and the alarm is lifted after the operator checks and solves the problem.

7. A construction method suitable for top-pushing of a large cantilever steel beam as claimed in claim 1, characterized in that: The anchoring jack is a continuous jack.

8. A construction method suitable for top-pushing of a large cantilever steel beam as claimed in claim 1, characterized in that: In S7, the anchor jack drives the movement of the weight body by pulling the steel strand, thereby achieving the purpose of deviation correction.

9. A construction method suitable for top-pushing of a large cantilever steel beam as claimed in claim 1, characterized in that: Lubrication measures are taken between the weighted slideway beam and the slider to reduce the friction between the slider and the slideway beam.

10. A weight-bearing system suitable for pushing a large cantilever steel beam, characterized in that: include: Two weighted sliding beams are parallel to the pushing direction and are fixedly installed on the tail of the steel beam respectively, and are extended in the direction opposite to the pushing direction when the steel beam is assembled and extended; Two rows of multiple pairs of sliders are placed on two weight slide beams and slide with them respectively. A connecting rod is fixedly connected between two adjacent sliders on the same weight slide beam to ensure synchronous sliding of the sliders. A weighted tray is supported and placed on multiple pairs of slides; A ballast body, which is placed on the ballast tray; Anchor jack and reaction seat, the anchor jack is fixed on the reaction seat, and the reaction seat is fixed outside the assembly platform area and away from the jacking direction; A steel strand is passed between the slider and the anchor jack, one end of the steel strand is fixed to the slider, and the other end is pulled and clamped by the anchor jack.

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