Integral lifting disassembly and assembly construction process for cantilever bent cap support

Abstract

The invention discloses an integral lifting disassembly and assembly construction process for a cantilever bent cap support. The integral lifting disassembly and assembly construction process comprises the steps that S1, a comprehensive lifting device is hoisted to the top of a bridge pier column to be installed and fixed; s2, a cantilever bent cap support is assembled on the ground; s3, the cantilever cover beam support is integrally lifted to a preset position, the cantilever cover beam support is installed and fixed, and the comprehensive lifting device is dismantled; s4, the cantilever bent cap is poured through the cantilever bent cap support; s5, the comprehensive lifting device is hoisted to the top of the cantilever cover beam to be installed and fixed; and S6, the whole cantilever bent cap support is lowered to the ground, the cantilever bent cap support is disassembled, and the cantilever bent cap support is disassembled on the ground. According to the construction method, the cantilever bent cap support is assembled on the ground, and then overall lifting is conducted through the comprehensive lifting device, so that the high-altitude operation time can be effectively shortened, the high-altitude falling risk of workers is reduced, and the psychological pressure on constructors is reduced; and after construction of the bent cap body is completed, the whole bent cap body is put down for construction of the next work point, and the turnover efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge pier cap beam construction, and in particular to an integral lifting, disassembling and assembling construction process for a cantilever cap beam support. Background Art

[0002] With the development of society, road and bridge projects, as basic infrastructure projects, are an important part of the urban transportation network. Highway bridges and viaducts use bridge piers as supporting foundations, and the cap beams bear and transmit the load of the bridge superstructure. That is, during the construction process, it is necessary to set up a cap beam bracket on the top of the pier to cast the cap beam. In actual process applications, the construction process of large cantilever cap beam brackets is also gradually improving and optimizing. In the existing large cantilever cap beam bracket construction method, split hoisting and high-altitude operation are mostly used. On the one hand, this method has low disassembly and assembly efficiency and long construction period. On the other hand, high-altitude operation has high requirements for safety assurance, especially in the high-altitude operation of high bridge piers or extra-high bridge piers. The psychological pressure on the operators is very high. Therefore, in order to reduce the high-altitude operation time and improve the construction efficiency, it is necessary to study and design the overall construction process of the large cantilever cap beam bracket, and realize the construction process of overall lifting, overall dismantling and lowering of the large cantilever cap beam bracket and operation adjustment, so as to facilitate the integrated hoisting and disassembly of the cap beam bracket and improve the construction efficiency. Summary of the invention

[0003] In view of the above problems, the present invention provides an integral lifting and disassembling construction process of a cantilever cap beam support, comprising the following steps:

[0004] S1, hoist the integrated lifting device to the top of the bridge pier and install and fix it with mounting parts;

[0005] S2, assembling the cantilever cap beam support on the ground to form an integral support;

[0006] S3, using the integrated lifting device on the top of the bridge pier to lift the cantilever cap beam support to a preset position as a whole, perform aerial work, install and fix the cantilever cap beam support, and remove the integrated lifting device after installation;

[0007] S4, casting the cantilever cap beam using the cantilever cap beam support;

[0008] S5, hoisting the integrated lifting device to the top of the cantilever cap beam, and fixing it with mounting parts;

[0009] S6, use the integrated lifting device on the top of the cantilever cap beam to lower the cantilever cap beam support to the ground as a whole, remove the cantilever cap beam support, and disassemble the cantilever cap beam support on the ground.

[0010] As a further explanation of the present invention, the mounting part is an embedded part, which is embedded in the top of the bridge pier when the bridge pier is cast and formed, and is embedded in the top of the cantilever cap beam when the cantilever cap beam is cast and formed in step S4.

[0011] Furthermore, the mounting member is an embedded steel bar of the bridge pier.

[0012] Furthermore, in the step S3, a sliding adjustment step of the supporting steel pipe piles is included.

[0013] Furthermore, the sliding adjustment step of the supporting steel pipe piles includes:

[0014] S301, using the integrated lifting device on the top of the bridge pier to lift the cantilever cap beam support as a whole to a certain distance above the preset position;

[0015] S302, installing the supporting steel pipe piles, hoisting the supporting steel pipe piles with a lifting device to slide and adjust the positions of the steel pipe piles to predetermined positions of the supporting steel pipe piles;

[0016] S303, using the integrated lifting device on the top of the bridge pier to lower the cantilever cap beam support as a whole to the top of the supporting steel pipe pile, and then install and fix it.

[0017] Furthermore, the step S6 includes a step of disassembling the supporting steel pipe piles, firstly using a comprehensive lifting device to lift the cap beam bracket to a certain height to reserve a net height for disassembly, using a car crane to disassemble the supporting steel pipe piles connected and fixed to the cantilever cap beam bracket, and then using the comprehensive lifting device to lower the cantilever cap beam bracket as a whole.

[0018] Furthermore, in the step S1, the position of the lifting point of the integrated lifting device is adjusted according to the width of the cantilever cap beam support.

[0019] Furthermore, the step S1 includes fine-tuning the integrated lifting device.

[0020] Furthermore, during the overall lifting process of the cantilever cap beam support in step S3, guide wheels are installed on the inner side of the cantilever cap beam support relative to the bridge pier.

[0021] Furthermore, during the overall lowering process of the cantilever cap beam support in step S6, guide wheels are installed on the inner side of the cantilever cap beam support relative to the bridge pier.

[0022] Beneficial effects of the present invention:

[0023] By adopting the construction method of the present invention, the cantilever cap beam support can be assembled on the ground and then lifted as a whole by the comprehensive lifting device, which can effectively reduce the high-altitude operation time of the cantilever cap beam support construction, reduce the risk of workers falling from heights, and reduce the psychological pressure on construction personnel; the subsequent turnover is high, and the dismantled cap beam support can also be lowered as a whole by the comprehensive lifting device installed on the top of the cap beam after the construction of the first cantilever cap beam support is completed, and the cap beam support can be transported to the next work site after lowering and removing some sections. At the next work site, it only needs to reassemble the dismantled sections before continuing the lifting construction, which improves the turnover efficiency, can effectively improve the disassembly and assembly efficiency of the cap beam support, improve construction efficiency, save costs, and shorten project construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of a comprehensive lifting device according to an embodiment of the present invention;

[0025] Figure 2 The cap beam support lifting process of the embodiment of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 3 The cap beam support lifting process of the embodiment of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 4 The cap beam support lowering process of the embodiment of the present invention is shown in FIG. Figure 1 ;

[0028] Figure 5 The cap beam support lowering process of the embodiment of the present invention is shown in FIG. Figure 2 ;

[0029] Figure 6 This is a schematic diagram of the arrangement of embedded parts of a cantilever cap beam according to an embodiment of the present invention;

[0030] Figure 7 It is a structural diagram of the limiting mechanism of the comprehensive lifting device according to an embodiment of the present invention.

[0031] Figure numerals: comprehensive lifting device 1, column fixing pad beam 2, column 3, load-bearing beam 4, lifting platform pad beam 5, embedded parts 6, continuous jack 7, cap beam support 8, bridge pier 9, supporting steel pipe piles 10, channel steel support 11, adjusting bolts 12, cantilever cap beam 13. DETAILED DESCRIPTION

[0032] Example:

[0033] The following is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention 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 cannot be understood as a limitation on the present invention.

[0035] For ease of understanding, the structure of the integrated lifting device 1 of the embodiment of the present invention is first described. The integrated lifting device 1 of the embodiment includes a lifting platform, a continuous jack lifting assembly and a limiting mechanism; the lifting platform includes a column fixed pad beam 2, a column 3, a load-bearing beam 4, a lifting platform pad beam 5 and a pad beam column; the column fixed pad beam 2, the column 3 and the load-bearing beam 4 constitute the main load-bearing structure of the lifting platform as a whole and are detachably installed and fixed through embedded parts; the lifting platform pad beam 5 is connected to the load-bearing beam 4 through the pad beam column, and several groups of the continuous jack lifting assembly are detachably installed and fixed on the lifting platform pad beam 5; the limiting mechanism is set corresponding to the continuous jack lifting assembly, and is used to fine-tune the angle of the continuous jack 7 of the continuous jack lifting assembly. The integrated lifting device 1 of the present invention can be installed and fixed on the top of the pier or cap beam through embedded parts, so as to be used for the overall lifting or lowering operation of the cantilever cap beam bracket 8.

[0036] Thus, the overall lifting and disassembly construction process of the cantilever cap beam support 8 using the above-mentioned integrated lifting device 1 specifically includes the following steps:

[0037] S1, hoist the integrated lifting device 1 to the top of the bridge pier 9, and use the mounting parts to install and fix it; after the integrated lifting device 1 is installed and fixed, in order to ensure that it meets the use requirements, a steel structure test is carried out to verify the working performance of the lifting device. The steel structure test simulates the graded loading of the bracket load. During the test, a total load of 180T is loaded, which is 1.2 times the most unfavorable load of the cap beam bracket. In an actual steel structure test application, the deflection value of the integrated lifting device 1 is 5mm at the maximum load. The test results are highly consistent with the model calculation and meet the safety specification requirements.

[0038] S2, assembling the cantilever cap beam support 8 on the ground to form an integral support.

[0039] S3, use the integrated lifting device 1 on the top of the bridge pier 9 to lift the cantilever cap beam support 8 to the preset position as a whole, perform aerial work, install and fix the cantilever cap beam support 8, and remove the integrated lifting device 1 after installation. In practical applications, a lifting test can be carried out before lifting, which can verify the continuity of the Bailey support during the lifting process and make early judgments on the problems that may be encountered during the lifting process. In a practical application, the trial lifting test lifted an 18m long cap beam support + 2 cushion beams totaling 20t. The cap beam support and the lifting device were connected by a lifting device sling. During the lifting process, insurance measures were set in the longitudinal direction of the support to increase the rigidity of the support during the lifting process. The trial lifting test lifts the cap beam support as a whole to the set position, and records the time required for the overall lifting of the cap beam support; then the cap beam support is lowered back to the ground as a whole, and the time required for the overall lowering of the cap beam support is recorded to compare whether the overall lifting and lowering time of the cap beam support are consistent. The continuity of the lifting process is checked through pre-lifting, and a further understanding of the subsequent lifting process and time control is gained. During subsequent formal operations, the integrated lifting device 1 can be set to full-automatic mode, and remote computer control of the integrated lifting device 1 can be achieved through the local area network to realize unmanned operation in the operating area.

[0040] S4, casting the cantilever cap beam 13 using the cantilever cap beam support 8;

[0041] S5, hoisting the integrated lifting device 1 to the top of the cantilever cap beam 13, and fixing it with mounting parts;

[0042] S6, using the integrated lifting device 1 on the top of the cantilever cap beam to lower the cantilever cap beam support to the ground as a whole, disassemble the cantilever cap beam support, and disassemble the cantilever cap beam support on the ground.

[0043] In this way, the overall lifting and disassembly construction process of the present invention is used for cap beam construction. First, the cap beam bracket 7 can be spliced ​​and assembled on the ground, which belongs to low-altitude operation, reducing the time of workers working at high altitude, which is conducive to avoiding the risk of workers falling from high altitude, and reducing the psychological pressure on construction personnel; the subsequent turnover is high, after the construction of the first cantilever cap beam bracket is completed, it can be transported to the next work site after the partial segments are lowered and dismantled, and the construction can be continued after the dismantled sections are reassembled at the next work site, which improves the turnover efficiency, can effectively improve the disassembly and assembly efficiency of the cap beam bracket, improve the efficiency of pier cap beam construction, save costs, and shorten the project period. For example, in a specific practical application, compared with the conventional cap beam construction (the car crane works for 10 days, 12 workers work for 12 days, and the work efficiency is 12 days), the comprehensive lifting device of the present invention is used for cap beam construction. The comprehensive lifting device works for 2 days, and 10 workers work for 10 days to complete the same amount of cap beam construction, with a work efficiency of 9 days. The comprehensive lifting device of the present invention shows obvious advantages in the economy and work efficiency of cap beam construction. In addition, the integrated lifting device of the present invention also solves the need for large lifting weight of the bracket as a whole, and also improves the accuracy of on-site construction, greatly reducing the time of high-altitude operations during the construction of the cap beam, successfully achieving the goal of high-altitude operations in the cap beam construction and low-altitude operations, and converting high-altitude operations with many control links and weak protection into ground operations, which is of great significance for eliminating risks and hidden dangers. For example, the risk of object impact and mechanical injury during the construction process using conventional construction technology is extremely high. While reducing high-altitude operations through the construction of the integrated lifting device, it also reduces safety hazards during the construction process.

[0044] As an implementation method, see the attached Figure 7As shown, the mounting part is an embedded part 6, which is embedded in the top of the bridge pier 9 when the bridge pier 9 is cast and formed, and is embedded in the top of the cantilever cap beam 13 when the cantilever cap beam 13 is cast and formed in step S4. The embedded part 6 is an embedded threaded steel bar or embedded bolt embedded in the top of the bridge pier 9, that is, during the casting process of the bridge pier 9, the embedded bolt is embedded in the top of the bridge pier 9 as a basis for fixing the integrated lifting device 1, so as to install and fix the integrated lifting device 1 on the top of the bridge pier 9. It is easy to understand that the installation and fixing method of the integrated lifting device 1 of the present invention is not limited to the embedded bolt fixing method of this embodiment. In some other embodiments, the integrated lifting device 1 can also be fixed by the embedded steel bars of the bridge pier 9. After the embedded steel bars of the bridge pier 9 are cast, they include protruding parts that are used as connecting cap beams. These protruding embedded steel bars can be used to fix the integrated lifting device 1 when it is installed. The integrated lifting device 1 can be specifically connected and fixed to the roots of these embedded steel bars by tying, welding or matching fixings, so that the integrated lifting device 1 can be installed and fixed on the top of the bridge pier 9.

[0045] In this embodiment, the step S3 includes a sliding adjustment step of the supporting steel pipe pile 10. The sliding adjustment step of the supporting steel pipe pile 10 specifically includes:

[0046] S301, using the integrated lifting device 1 on the top of the bridge pier 9 to lift the cantilever cap beam support 8 as a whole to a certain distance above the preset position;

[0047] S302, installing the supporting steel pipe piles, hoisting the supporting steel pipe piles with a lifting device to slide and adjust the positions of the steel pipe piles to predetermined positions of the supporting steel pipe piles;

[0048] S303, using the integrated lifting device 1 on the top of the bridge pier to lower the cantilever cap beam support as a whole to the top of the supporting steel pipe pile, and then install and fix it.

[0049] In this embodiment, step S6 includes a step of disassembling supporting steel pipe piles, firstly using a comprehensive lifting device to lift the cap beam support to a certain height to reserve a clear height for disassembly, using a car crane to disassemble the supporting steel pipe piles connected and fixed to the cantilever cap beam support, and then using the comprehensive lifting device to lower the cantilever cap beam support as a whole.

[0050] In the present embodiment, in the step S1, the lifting point position of the integrated lifting device 1 is adjusted according to the width of the cantilever cap beam bracket 8. Specifically, a plurality of installation holes are arranged at intervals on the load-bearing beam 4 of the present embodiment, and the continuous jack lifting assembly is installed on the installation holes. Specifically, in order to ensure the balance of the lifting force, the continuous jack 7 is symmetrically installed and fixed at both ends of the load-bearing beam 4. On the other hand, in order to adapt to the lifting of cap beam brackets 8 with different spans, the continuous jack 7 can be installed on a suitable installation hole according to actual needs, so as to achieve a suitable lifting point for cap beam brackets 8 with different spans, so as to improve the flexibility and applicability of the integrated lifting device 1 of the present embodiment.

[0051] In this embodiment, the step S1 includes fine-tuning the integrated lifting device 1. Figure 7 As shown, the limiting mechanism in this embodiment includes a channel steel bracket 11 arranged around the continuous jack lifting assembly and an adjusting bolt 12 arranged on the channel steel bracket 11. In this embodiment, the channel steel bracket 11 is a square bracket, and the adjusting bolt 12 is arranged in four directions of the square bracket. Four adjusting bolts 12 are arranged in four directions of the continuous jack 7. In practical applications, the continuous jack 7 is pushed and adjusted by adjusting the adjusting bolts 12 in one or more directions. For example, when it is detected that the inclination of the continuous jack 7 to one side is greater than the allowable error range, the continuous jack 7 can be pushed and straightened by adjusting the adjusting bolt 12 on the side of the corresponding inclination direction of the continuous jack 7 to correct the error. That is, by arranging the adjusting bolts 12 around, the continuous jack 7 can be fine-adjusted to a state perpendicular to the horizontal plane to ensure the stability of the force, reduce the risk of overturning caused by unbalanced force during the lifting process, and ensure the construction safety of the cap beam bracket 8 of the comprehensive lifting device 1.

[0052] In this embodiment, during the overall lifting process of the cantilever cap beam support 8 in step S3, guide wheels are installed on the inner side of the cantilever cap beam support 8 relative to the bridge pier 9. In this way, during the overall lifting process of the cantilever cap beam support 8, under the action of the guide wheels, even if the cantilever cap beam support 8 contacts the bridge pier 9, it will not scratch the bridge pier 9 and cause damage to the bridge pier 9. Similarly, during the overall lowering process of the cantilever cap beam support 8 in step S6, guide wheels are installed on the inner side of the cantilever cap beam support 8 relative to the bridge pier 9, which also plays a protective role of guiding sliding and avoiding damage to the bridge pier 9.

[0053] The above only describes the preferred embodiments of the present invention, but it cannot be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. In short, all changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. A construction process for the overall lifting and disassembly of a cantilever cap beam support, characterized in that: The following steps are involved: S1, hoist the integrated lifting device to the top of the bridge pier and install and fix it with mounting parts; S2, assembling the cantilever cap beam support on the ground to form an integral support; S3, using the integrated lifting device on the top of the bridge pier to lift the cantilever cap beam support to a preset position as a whole, perform aerial work, install and fix the cantilever cap beam support, and remove the integrated lifting device after installation; S4, casting the cantilever cap beam using the cantilever cap beam support; S5, hoisting the integrated lifting device to the top of the cantilever cap beam, and fixing it with mounting parts; S6, use the integrated lifting device on the top of the cantilever cap beam to lower the cantilever cap beam support to the ground as a whole, remove the cantilever cap beam support, and disassemble the cantilever cap beam support on the ground.

2. The overall lifting and disassembly construction process of a cantilever cap beam support according to claim 1 is characterized in that: The mounting part is an embedded part, which is embedded in the top of the bridge pier when the bridge pier is cast, and is embedded in the top of the cantilever cap beam when the cantilever cap beam is cast in step S4.

3. The overall lifting and disassembly construction process of a cantilever cap beam support according to claim 1 is characterized in that: The mounting piece is an embedded steel bar of the bridge pier.

4. The overall lifting and disassembly construction process of a cantilever cap beam support according to claim 1 is characterized in that: The step S3 includes a sliding adjustment step of the supporting steel pipe piles.

5. The overall lifting and disassembly construction process of a cantilever cap beam support according to claim 4 is characterized in that: The sliding adjustment step of the supporting steel pipe pile comprises: S301, using the integrated lifting device on the top of the bridge pier to lift the cantilever cap beam support as a whole to a certain distance above the preset position; S302, installing the supporting steel pipe piles, hoisting the supporting steel pipe piles with a lifting device to slide and adjust the positions of the steel pipe piles to predetermined positions of the supporting steel pipe piles; S303, using the integrated lifting device on the top of the bridge pier to lower the cantilever cap beam support as a whole to the top of the supporting steel pipe pile, and then install and fix it.

6. The overall lifting and disassembly construction process of a cantilever cap beam support according to claim 1 is characterized in that: The step S6 includes a step of disassembling the supporting steel pipe piles, firstly using a comprehensive lifting device to lift the cap beam support to a certain height to reserve a clear height for disassembly, using a car crane to disassemble the supporting steel pipe piles connected and fixed to the cantilever cap beam support, and then using the comprehensive lifting device to lower the cantilever cap beam support as a whole.

7. The overall lifting and disassembly construction process of a cantilever cap beam support according to claim 1 is characterized in that: In the step S1, the position of the lifting point of the integrated lifting device is adjusted according to the width of the cantilever cap beam support.

8. The overall lifting and disassembly construction process of a cantilever cap beam support according to claim 1 is characterized in that: The step S1 includes fine-tuning the integrated lifting device.

9. The overall lifting and disassembly construction process of a cantilever cap beam support according to claim 1 is characterized in that: During the overall lifting process of the cantilever cap beam support in step S3, guide wheels are installed on the inner side of the cantilever cap beam support relative to the bridge pier.

10. The overall lifting and disassembly construction process of a cantilever cap beam support according to claim 1 is characterized in that: During the overall lowering process of the cantilever cap beam support in step S6, guide wheels are installed on the inner side of the cantilever cap beam support relative to the bridge pier.

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