A construction method for dismantling frame beams

Abstract

The present invention discloses a frame beam dismantling construction method, comprising the following steps: step one: setting up a lowering system; setting up a lowering system above the frame beam, with its support point set at the top of the bridge pier, and the lowering system is used to transport or lower the frame beam section to be dismantled; step two: traffic conversion and protection shed installation; installing a protection shed at the position of the middle half of the frame beam, and closing the other half of the frame beam as a construction channel, converting road traffic to the protection shed; step three: dismantling the frame beam in spans; cutting the frame beam span by span and section by section in a set order, and using the lowering system to dismantle the frame beam span by span and section in sequence; step four: dismantling the lowering system; step five: dismantling the bridge pier to complete the dismantling of the frame beam. The frame beam dismantling construction method of the present invention can better adapt to the bridge structure and construction environment, and realize rapid dismantling construction.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge dismantling construction, and more specifically, to a frame beam dismantling construction method. Background Art

[0002] With the rapid development of my country's economy and society, social and economic activities have put forward higher requirements on the carrying capacity of transportation infrastructure. The demolition project of frame structure bridges located in highly urbanized areas is not completely suitable for demolition operations using conventional methods and equipment due to its new characteristics such as complex structural system, high construction risk, high construction safety requirements, complex surrounding environment and difficult traffic relief. The conventional construction method is generally to set up a support on the side of the bridge and use a truck crane to demolish it.

[0003] In order to solve the above problems, the present application provides a frame beam dismantling construction method to better adapt to the bridge structure and construction environment and realize rapid dismantling construction. Summary of the invention

[0004] An object of the present invention is to provide a frame beam dismantling construction method that can better adapt to the bridge structure and construction environment and achieve rapid dismantling construction.

[0005] In order to achieve these purposes and other advantages according to the present invention, a frame beam removal construction method is provided, comprising the following steps:

[0006] Step 1: Setting up a lowering system: Setting up a lowering system above the frame beam, with its support point set at the top of the bridge pier, and the lowering system is used to transport or lower the frame beam section to be dismantled;

[0007] Step 2: Traffic conversion and protection shed installation: Install the protection shed at the position of one half of the frame beam, and close the other half of the frame beam as a construction channel to convert road traffic to the protection shed;

[0008] Step 3: Dismantle the frame beams in sections; cut the frame beams in sections and spans according to the set sequence, and use the lowering system to dismantle the frame beams in sections and spans according to the sequence;

[0009] Step 4: Dismantle the lowering system;

[0010] Step 5: Remove the bridge piers and complete the removal of the frame beams.

[0011] Preferably, the lowering system in step 1 comprises:

[0012] A longitudinal load-bearing beam, which can be detachably arranged on the longitudinal beams on both sides along the longitudinal beam direction of the bridge, wherein the longitudinal load-bearing beam is detachably connected as a whole by a plurality of basic load-bearing beams, and a track beam is arranged on the longitudinal load-bearing beam, which is also detachably connected as a whole by a plurality of basic track beams;

[0013] A transverse load-bearing beam is detachably arranged on a pair of track beams and moves along the track beams in the direction of the bridge. A continuous jack is slidably arranged on the transverse load-bearing beam and moves along the length direction of the transverse load-bearing beam. A sling is connected to the continuous jack. The transverse load-bearing beam is located in a pair.

[0014] Preferably, in step 2, the protective shed is assembled in advance, and the traffic is temporarily closed during a period of low traffic at night to install the protective shed in place.

[0015] Preferably, the protective shed includes: a sliding foundation, steel pipe columns and an assembled ceiling, the sliding foundations are symmetrically arranged in two rows, a plurality of sliding foundations in each row are evenly spaced, a road traffic is formed between the two rows of sliding foundations, a sliding structure is arranged at the bottom of the sliding foundation, a steel pipe column is correspondingly arranged on each sliding foundation, an assembled ceiling is arranged between the steel pipe columns in the same row to form a door-type structure, and adjacent steel pipe columns in the same row are connected as a whole by connecting struts.

[0016] Preferably, the dismantling of the frame beams in the step three includes: dismantling the frame beams in a single span in the general order of first plate and then beam, first cross beam and then longitudinal beam, first cutting and lowering the bridge deck on the closed construction road side, and then cutting the bridge deck on the other side and moving it horizontally to the top of the closed road through a lowering system and then lowering it; when the cross beams are cut in sections, a plurality of support columns are arranged on the assembled shed roof to form support points, and the beams are removed in sections by cutting and then moving them horizontally to the closed road side and then lowering them; the single-span longitudinal beams are cut as a whole span and then moved horizontally down, and all dismantled beams are moved horizontally to the closed road side and then lowered onto a transport vehicle and transported to a centralized dismantling site.

[0017] Preferably, the longitudinal load-bearing beams need to be continuously dismantled and assembled during the dismantling of each span of the lowering system. After dismantling a section of the bridge span, the longitudinal load-bearing beams are dismantled in sections and installed at the tail, and used in reverse order.

[0018] Preferably, the bridge pier removal in step 5 is also to remove the side pier columns in sections.

[0019] Preferably, the erection and dismantling of the lower system and the removal of the bridge piers are carried out using a truck crane located on the ground.

[0020] The present invention has at least the following beneficial effects:

[0021] The present invention provides a frame beam dismantling construction method, wherein the protective shed can be quickly moved through its sliding foundation bracket to achieve rapid traffic conversion, and the foundation of the frame beam bridge lowering system uses the existing bridge piers for support, reducing the impact on the surrounding environment, and the lowering of large sections can achieve rapid bridge dismantling. The demolition construction method of the present invention not only ensures the passage of vehicles under the bridge, but also gets rid of the influence of the restricted environment in the urban area. The demolition is completed with a set of large-section lowering system on the bridge, which reduces the investment in foundation and equipment, realizes the rapid dismantling of the bridge, and improves the economic efficiency.

[0022] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A flow chart of a frame beam removal construction method of the present invention;

[0024] Figure 2 A schematic diagram of the installation of a lowering system and traffic conversion of a frame beam removal construction method of the present invention;

[0025] Figure 3 A schematic diagram of the overall removal sequence of a single-span beam slab in a frame beam removal construction method of the present invention;

[0026] Figure 4 A schematic diagram of beam removal in a frame beam removal construction method of the present invention;

[0027] Figure 5 A schematic diagram of longitudinal beam removal in a frame beam removal construction method of the present invention;

[0028] Figure 6 The present invention is a schematic diagram of pier removal in a frame beam removal construction method.

[0029] Description of reference numerals:

[0030] 1. Lowering system, 11. Longitudinal load-bearing beam, 12. Transverse load-bearing beam, 13. Track beam, 14. Jack, 15. Lifting device, 2. Protective shed, 21. Sliding foundation, 22. Steel pipe column, 23. Assembled ceiling. 24. Support column, 3. Frame beam, 31. Longitudinal beam, 32. Transverse beam, 33. Pier, 4. Truck crane. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0032] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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.

[0033] like Figure 1 As shown, the present invention provides a construction method for dismantling a frame beam 3, which specifically includes the following steps:

[0034] Step 1: If Figure 2 and Figure 3 As shown, the lowering system 1 is set up, and the lowering system 1 is set up on the frame beam 3 by a ground truck crane 4, which is used to transport or lower the frame beam section to be removed;

[0035] The erection of the lowering system 1 includes installing the lowering system 1 above the frame beam 3, and the traffic under the bridge is not affected during the erection process; the lowering system 1 sets a support point on the top of the pier 33, fully utilizing the existing pier 33 as a load-bearing foundation, reducing the investment in the foundation and the requirements for the ground load-bearing capacity.

[0036] The lowering system 1 includes a longitudinal load-bearing beam 11 composed of multiple Bailey beams arranged above the longitudinal beam 31 along the bridge, a track beam 13 arranged on the longitudinal load-bearing Bailey beam, a transverse load-bearing beam 12 arranged on the track beam 13, and a continuous jack lowering system arranged on the transverse load-bearing beam 12, including a jack 14 and a sling 15. The continuous jack lowering system can move through the transverse load-bearing beam 12 and move along the longitudinal track beam 13, thereby realizing transverse and longitudinal movement, transporting or lowering the three sections of the frame beam to be removed. The longitudinal load-bearing beam 11, the transverse load-bearing beam 12, and the track beam 13 are all detachably connected to each other, and conventional connection methods such as bolts can be used. The transverse load-bearing beams 12 are located in a pair, and two jacks 14 are generally arranged on each transverse load-bearing beam 12 to adapt to the transportation and removal of the transverse beam 32 and the longitudinal beam 31. The longitudinal load-bearing beam 11 is detachably connected as a whole by a plurality of basic load-bearing beams, and the track beam 13 is also detachably connected as a whole by a plurality of basic track beams, so that the longitudinal load-bearing beam 11 and the track beam 13 can be continuously dismantled and reinstalled along the direction of the bridge in the later stage to adapt to the dismantling process, make full use of resources, and reduce the investment in temporary measures by using them forward and backward.

[0037] Step 2: If Figure 2As shown, traffic conversion and installation of the protective shed 2 are performed. The slidable protective shed 2 brackets are assembled and formed around the demolished bridge in advance. The protective shed 2 is quickly installed to the half-width frame beam position during the period of low traffic at night, and the other half-width traffic is closed as a construction channel. The right half-width traffic is closed as an example in the drawings of this application;

[0038] The traffic conversion and installation of the protective shed 2 in step 2 include assembling the movable protective shed 2 in advance near the front and rear of the demolition area, and choosing to temporarily close the traffic during a period of low traffic volume to quickly install the protective shed 2 in place, which can greatly reduce the time the road is occupied; after the installation of the protective shed 2, the traffic on the right half is closed, and the road traffic is converted to the protective shed 2 corresponding to the traffic on the left half.

[0039] The movable protective shed 2 includes a foundation 21 that can slide forward and backward, a steel pipe column 22, and an assembled ceiling 23. The assembled protective shed 2 can be quickly moved to the required position through the sliding foundation 21, which can effectively solve the problem of limited space under the bridge. The steel pipe column 22 of the protective shed 2 is installed at the position of the frame crossbeam 32, and 4 spans are installed at a time. It can also be set as needed and continuously moved as the frame beam is removed. The sliding foundation is symmetrically arranged in two rows, arranged along the direction of the longitudinal beam, and multiple sliding foundations in each row are evenly spaced. Road traffic is formed between the two rows of sliding foundations. A sliding structure is arranged at the bottom of the sliding foundation, which is generally a pulley or roller. A steel pipe column is correspondingly arranged on each sliding foundation. An assembled ceiling is arranged between the steel pipe columns in the same row to form a door-type structure. Adjacent steel pipe columns in the same row are connected as a whole by connecting struts, and the connecting struts are cross-arranged.

[0040] Step 3: If Figure 3 As shown, the frame beam 3 is dismantled in spans, and the frame beam 3 is dismantled in sequence span by span by using the lowering system 1. Figure 3 Dismantle in the order indicated in the figure;

[0041] like Figure 4 and Figure 5 As shown, the dismantling of the frame beam 3 in the step 3 includes dismantling the frame beam 3 in the single span in the general order of first the plate and then the beam, first the cross beam 32 and then the longitudinal beam 31. First, the bridge deck on the closed construction road side is cut and lowered, and the bridge deck on the other side is cut and then moved horizontally to the top of the closed road by the lowering system 1 and then lowered; when the cross beam 32 is cut in sections, multiple support columns 24 are set on the assembled ceiling 23 to form a support point, and the cross beam 32 is removed in blocks by cutting and then moving horizontally to the closed road side and then lowering; the single-span longitudinal beam 31 is cut and then moved horizontally to the closed road side, and all the dismantled beams are moved horizontally to the closed road side and then lowered to the transport vehicle and transported to the centralized dismantling site. The setting of the assembled ceiling 23 and multiple support columns 24 can support the cross beam on the one hand, and protect the vehicles on the road below on the other hand.

[0042] The longitudinal load-bearing beam 11 needs to be continuously dismantled and assembled during the dismantling of each span of the lowering system 1. After dismantling a span, the longitudinal load-bearing beam 11 is dismantled in sections and installed at the tail, and the front and back are used to reduce the investment in temporary measures, such as Figure 5 shown.

[0043] Step 4: dismantle the lowering system 1, and the ground truck crane 4 dismantles the lowering system 1;

[0044] Step 5: Removal of the bridge pier 33, the ground crane 4 removes the pier column. The removal of the bridge pier 33 in step 5 includes using the crane 4 to remove the side pier column in sections on the bridge or on the ground. Figure 6 .

[0045] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A frame beam removal construction method, It is characterized in that The steps include: Step 1: Setting up a lowering system: Setting up a lowering system above the frame beam, with its support point set at the top of the bridge pier, and the lowering system is used to transport or lower the frame beam section to be dismantled; Step 2: Traffic conversion and protection shed installation: Install the protection shed at the position of one half of the frame beam, and close the other half of the frame beam as a construction channel to convert road traffic to the protection shed; Step 3: Remove the frame beams in spans; Cut the frame beams in sections and spans according to the set sequence, and remove the frame beams in sections and spans according to the sequence using the lowering system; The dismantling of frame beams in different spans includes: the frame beams are dismantled in the order of first the slab and then the beam, first the cross beam and then the longitudinal beam for a single span. The bridge deck on the closed construction road side is first cut and lowered. The bridge deck on the other side is cut and then moved horizontally to the top of the closed road through the lowering system and then lowered. When the cross beams are cut in sections, multiple support columns are set on the assembled shed roof to form support points. The beams are removed in sections by cutting and then moving horizontally to the closed road side and then lowering. The single-span longitudinal beams are cut and then moved horizontally to the closed road side. All dismantled beams are moved horizontally to the closed road side and then lowered to the transport vehicle and transported to the centralized dismantling site. Step 4: Dismantle the lowering system; Step 5: Remove the bridge piers and complete the removal of the frame beams; The lowering system in step 1 includes: A longitudinal load-bearing beam, which can be detachably arranged on the longitudinal beams on both sides along the longitudinal beam direction of the bridge, wherein the longitudinal load-bearing beam is detachably connected as a whole by a plurality of basic load-bearing beams, and a track beam is arranged on the longitudinal load-bearing beam, which is also detachably connected as a whole by a plurality of basic track beams; A transverse load-bearing beam is detachably mounted on a pair of track beams and moves along the track beams in the direction of the bridge. A continuous jack is slidably mounted on the transverse load-bearing beam and moves along the length direction of the transverse load-bearing beam. A sling is connected to the continuous jack. A pair of transverse load-bearing beams are arranged.

2. The frame beam removal construction method according to claim 1, It is characterized in that In the step 2, the protective shed is assembled in advance, and the traffic is temporarily closed during the period of low traffic volume at night to install the protective shed in place.

3. The frame beam removal construction method according to claim 1, It is characterized in that The protective shed includes: a sliding foundation, steel pipe columns and an assembled ceiling. The sliding foundations are symmetrically arranged in two rows, and multiple sliding foundations in each row are evenly spaced to form a road traffic between the two rows of sliding foundations. A sliding structure is arranged at the bottom of the sliding foundation. Steel pipe columns are correspondingly arranged on each sliding foundation. An assembled ceiling is arranged between the steel pipe columns in the same row to form a door-type structure. Adjacent steel pipe columns in the same row are connected as a whole by connecting struts.

4. The frame beam removal construction method according to claim 1, It is characterized in that The longitudinal load-bearing beams need to be continuously dismantled and assembled during the dismantling of each span of the lowering system. After a section of the bridge span is dismantled, the longitudinal load-bearing beams are dismantled in sections and installed at the tail, and used in reverse order.

5. The frame beam removal construction method according to claim 1, It is characterized in that In step 5, the bridge pier is removed by removing the side pier columns in sections.

6. The frame beam removal construction method according to claim 1, It is characterized in that The erection and dismantling of the lower system and the removal of the bridge piers are all carried out using a truck crane located on the ground.

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