Cast-in-place arch bridge arch frame integral assembly and disassembly construction method

Abstract

The invention relates to a cast-in-place arch bridge arch frame integral mounting and dismounting construction method. The method comprises the steps of splicing of pushing arch frame single bodies, pushing-hoisting mounting of the pushing arch frame single bodies, arch rib pouring and dismounting of the pushing arch frame single bodies. The single-piece arch frames are horizontally spliced on a splicing site at one end of a bridge site according to an arch rib line shape, and the single-piece arch frames are transversely connected to form a single-set arch frame and then transversely connected to form a pushing arch frame single body. The single pushing arch frame is hoisted to a pushing rail and pushed to a cable hoisting area, pushing is conducted in the longitudinal bridge direction, front-end hoisting is conducted, pushing continues, rear-end hoisting is conducted, the whole is hoisted in place, and arch feet of the arch frame are temporarily locked; the arch ribs reach the design strength, and bridge floor structure construction is completed; supports are unloaded; pushing arch frame single body transverse connection is relieved in groups; tie bars are installed; and the arch frame single bodies are transversely moved to the outer sides of the arch ribs group by group, hoisted to a bridge floor by a cable crane group by group to be dismantled and transported away from the field. The installation time of the whole arch frame is shortened, and the whole construction period is shortened; aloft work is reduced, construction efficiency is improved, construction safety is guaranteed, and the line shape of the arch center is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering bridge construction, and in particular to a method for integrally installing and disassembling an arch frame of a cast-in-place arch bridge. Background Art

[0002] Arch bridges have the characteristics of large spanning capacity, high bearing capacity, and good durability. In particular, concrete arch bridges have the advantages of good durability and freedom from daily maintenance. They are the main bridge type that crosses deep mountain canyons and wide rivers in mountainous areas. The difficulty in the construction of concrete arch bridges lies in the fact that there is a deep canyon or river under the bridge, and it is impossible to set up a ground support for cast-in-place construction. Generally, the rigid skeleton method and arch frame method can be used to cast the arch ribs. The erection of rigid skeletons and arch frames generally uses cable hoisting + inclined stay buckle hanging system for cantilever assembly. The cable hoisting + inclined stay buckle hanging system mainly includes cable hoists, buckle towers, buckle cables, back cables and anchors. The arch frame segments are hoisted and suspended by cable hoists. The inclined stay buckle hanging system is used for temporary fixation and linear adjustment of suspended arch frames. The structure of the cable-stayed buckle system is complex, with many temporary structures. The theoretical calculation of the buckle and linear adjustment is a nonlinear problem. The on-site implementation effect is poor and requires multiple adjustments. The suspended arch frame involves a large amount of high-altitude operations, low construction efficiency, difficult to ensure quality, and is greatly affected by strong winds, rain and snow. Summary of the invention

[0003] The present invention aims to solve the deficiencies of the prior art and provides a method for integrally installing and disassembling an arch frame of a cast-in-place arch bridge.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for integrally installing and disassembling an arch frame of a cast-in-place arch bridge comprises the following steps:

[0006] S1. Assembly of the push arch frame unit:

[0007] The push arch frame monomer is composed of several arch frame groups connected by transverse connectors. Each arch frame group is composed of two single-piece arch frames connected by several transverse connectors. The single-piece arch frame is composed of several arch frame segments assembled and connected with tie rods. The arch frame segments are processed in the factory.

[0008] S2. Push-up arch frame single unit push-up-hoisting installation:

[0009] S21. A jacking site is set up at one end of the arch bridge, the site is set up along the longitudinal axis of the arch bridge, and a jacking track and jacking equipment are installed;

[0010] S22, hoisting the single unit of the top-pushing arch frame to be erected to the top-pushing track and placing it in place;

[0011] S23, using the pushing equipment to push the pushing arch frame monomer until the front end lifting point of the pushing arch frame monomer arrives directly below the cable hoisting trolley, and then pausing the pushing;

[0012] S24. Install a lifting device at the front end of the push arch frame unit, connect the lifting device and the cable crane trolley, lift the cable crane trolley, and the front end weight of the push arch frame unit is borne by the cable crane trolley;

[0013] S25, continue to push the arch frame monomer forward, and the cable crane trolley is synchronously pulled forward by the traction rope until the rear end lifting point of the arch frame monomer arrives directly below another cable crane trolley;

[0014] S26, stop pushing, install another lifting device at the rear end of the pushing arch frame unit, connect the lifting device and the corresponding cable crane trolley, lift the lifting cable, the weight of the pushing arch frame unit is completely borne by the cable crane, the cable crane trolley lifts the pushing arch frame unit forward and lowers it until the arch foot of the arch frame is placed in place on the arch seat, and the arch foot of the arch frame is temporarily locked;

[0015] S27, repeating steps S22 to S26, installing the remaining push arch frame monomers, and then applying transverse connectors, all the push arch frame monomers together form an integral arch frame, temporarily locking the arch frame arch feet, releasing the tie rods, and completing the installation of the integral arch frame;

[0016] S3. Arch rib casting:

[0017] After the overall arch frame is installed, it is pre-stressed in accordance with the relevant specifications. After the pre-stressing is qualified, the arch rib concrete is poured in sections and layers according to the design and construction requirements. The arch rib concrete is maintained to reach the design strength to form the arch rib. After the arch rib concrete reaches the design strength, the arch bridge deck is constructed;

[0018] S4. Dismantling of the single push arch frame:

[0019] S41. Install temporary tie rods to restore the overall arch frame to a "bow" shape. The overall arch frame is removed from the arch ribs, and the transverse connectors are removed in the order of "install last, remove first", to restore the state of the single push arch frame during installation;

[0020] S42. Drag the push arch frame unit laterally to the outside of the arch rib, use a cable hoist trolley to lift the push arch frame unit out of the bridge deck, release the transverse connectors and tie rods, disassemble it into arch frame segments, dismantle all the arch frames, and transport the arch frame segments away from the site.

[0021] The specific steps of step S1 are:

[0022] S11. An assembly site for the push-up arch frame monomer is set up at one end of the bridge. The processed arch frame segments are transported to the assembly site, and the single-piece arch frame is horizontally assembled according to the arch rib design line shape. The arch frame segments are connected by pins and bolts. Tie rods are set between the two inner ends of the single-piece arch frame, and the single-piece arch frame forms a "bow"-shaped arch system;

[0023] S12. The single-piece arch frame is adjusted to a vertical state by a crane and fixed by temporary supports and guy ropes. Transverse connectors are constructed between two single-piece arch frames to form an arch frame group. Transverse connectors are constructed between several arch frame groups to form a single push-up arch frame.

[0024] In step S12, the distance between two single-piece arch frames of the arch frame group is determined comprehensively based on the bearing capacity of the single-piece arch frame and the load of the cast-in-place arch rib.

[0025] In step S12, the number of arch frame groups of the jacking arch frame unit is determined comprehensively based on the stability, jacking capacity and cable lifting capacity of the jacking arch frame unit. The minimum number of arch frame groups meets the stability requirement of the self-supporting state of the jacking arch frame unit, and the maximum number of arch frame groups does not exceed the jacking and cable lifting capacity.

[0026] In step S3, a plurality of arch columns are installed on the arch ribs, and the arch bridge deck is constructed on the arch columns.

[0027] The beneficial effects of the present invention are as follows: the present invention shortens the installation time of the integral arch frame and saves the overall construction period; the integral assembly of the jack-pushing arch frame units on site can reduce a large amount of high-altitude operations, improve construction efficiency, and ensure construction safety; the linear shape of the integral arch frame is easy to adjust and the quality is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of a single-piece arch frame in the present invention;

[0029] Figure 2 It is an elevation view of the arch frame group in the present invention;

[0030] Figure 3 A top view of the arch frame assembly in the present invention;

[0031] Figure 4 It is an elevation view of the push arch frame monomer in the present invention;

[0032] Figure 5 It is a top view of the push arch frame monomer in the present invention;

[0033] Figure 6 It is a schematic diagram of the jacking arch frame monomer in step S2 of the present invention being in place and ready for jacking;

[0034] Figure 7 It is a schematic diagram of the push arch frame monomer moving forward and the front end being connected to the cable hoisting trolley in step S2 of the present invention;

[0035] Figure 8 It is a schematic diagram of the push arch frame monomer moving forward and the rear end being connected to the cable hoisting trolley in step S2 of the present invention;

[0036] Fig. 9It is a schematic diagram of the jacking arch frame being hoisted into place in step S2 of the present invention;

[0037] Fig.10 A schematic diagram of lowering the jacking arch frame into place in step S2 of the present invention;

[0038] Fig.11 It is a schematic diagram of the arch rib casting and arch bridge deck construction in step S3 of the present invention;

[0039] Fig.12 It is a schematic diagram of dismantling the jacking arch frame monomer in step S4 of the present invention;

[0040] In the figure: 1-pushing arch frame unit; 2-pushing track; 3-pushing equipment; 4-cable hoisting trolley; 5-hanging device; 6-arch frame arch foot; 7-arch seat; 8-arch rib; 9-arch bridge deck; 10-arch upper column;

[0041] 101-single-piece arch frame; 102-lateral connecting member;

[0042] 1011-arch frame segment; 1012-tie rod;

[0043] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0044] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0045] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0048] A method for integrally installing and disassembling an arch frame of a cast-in-place arch bridge comprises the following steps:

[0049] S1. Assembly of the push arch frame unit 1:

[0050] like Figures 1 to 5 As shown, the push arch frame monomer 1 is composed of a plurality of arch frame groups connected by transverse connectors 102, each arch frame group is composed of two single-piece arch frames 101 connected by a plurality of transverse connectors 102, the single-piece arch frame 101 is composed of a plurality of arch frame segments 1011 assembled and connected with tie rods 1012, the arch frame segments 1011 are processed by the factory, and the tie rods 1012 are made of precision-rolled threaded steel;

[0051] S11. An assembly site for a top-pushing arch frame monomer 1 is set at one end of the bridge. The processed arch frame segments 1011 are transported to the assembly site. The single-piece arch frame 101 is assembled horizontally according to the design line of the arch rib. The arch frame segments 1011 are connected by pins and bolts. Tie rods 1012 are set between the inner two ends of the single-piece arch frame 101. The single-piece arch frame 101 forms a "bow"-shaped arch system;

[0052] S12, the single-piece arch frame 101 is adjusted to a vertical state by a crane, and fixed by temporary support and cable ropes, and a transverse connector 102 is constructed between two single-piece arch frames 101 to form an arch frame group, and transverse connectors 102 are constructed between several arch frame groups to form a top-pushing arch frame monomer 1;

[0053] The spacing between the two single-piece arch frames 101 of the arch frame group is determined based on the bearing capacity of the single-piece arch frame 101 and the load of the cast-in-place arch rib 8;

[0054] The number of arch frame groups of the jacking arch frame monomer 1 is determined comprehensively based on the stability, jacking capacity and cable lifting capacity of the jacking arch frame monomer 1. The minimum number of arch frame groups meets the stability requirements of the self-supporting state of the jacking arch frame monomer 1, and the maximum number of arch frame groups does not exceed the jacking and cable lifting capacities.

[0055] S2, push arch frame monomer 1 push-lift installation, such as Figures 6 to 10 As shown:

[0056] S21, setting a jacking site at one end of the arch bridge, the site is set along the longitudinal axis of the arch bridge, and installing a jacking track 2 and a jacking device 3;

[0057] S22, hoisting the single body of the jacking arch frame 1 to be erected to the jacking track 2 and putting it in place;

[0058] S23, using the pushing device 3 to push the pushing arch frame monomer 1, until the front end lifting point of the pushing arch frame monomer 1 arrives directly below the cable hoisting trolley 4, and the pushing is stopped;

[0059] S24, installing a sling 5 at the front end of the push arch frame monomer 1, connecting the sling 5 and the cable hoist trolley 4, lifting the cable hoist rope, and the front end weight of the push arch frame monomer 1 is borne by the cable hoist trolley 4;

[0060] S25, continue to push the arch frame monomer 1 forward, and the cable crane trolley 4 is synchronously pulled forward by the traction rope until the rear end lifting point of the arch frame monomer 1 arrives directly below another cable crane trolley 4;

[0061] S26, stop pushing, install another lifting device 5 at the rear end of the pushing arch frame monomer 1, connect the lifting device 5 and the corresponding cable crane trolley 4, lift the lifting cable, the weight of the pushing arch frame monomer 1 is completely borne by the cable crane, the cable crane trolley 4 lifts the pushing arch frame monomer 1 forward and lowers it until the arch foot 6 is placed in place on the arch seat 7, and the arch foot 6 is temporarily locked;

[0062] S27, repeat steps S22 to S26, install the remaining pushing arch frame monomers 1, and then apply the transverse connecting piece 102, all the pushing arch frame monomers 1 together form an integral arch frame, temporarily lock the arch frame arch foot 6, release the tie rod 1012, and complete the installation of the integral arch frame.

[0063] S3, Arch rib casting, such as Fig.11 As shown:

[0064] After the overall arch frame is installed, it is pre-stressed in accordance with relevant specifications. After the pre-stressing is qualified, the arch rib concrete is poured in sections and layers according to the design and construction requirements. The arch rib concrete is cured to reach the designed strength to form the arch rib 8. A number of arch columns 10 are installed on the arch rib 8, and the arch bridge deck 9 is constructed on the arch columns 10.

[0065] S4, dismantle the push arch frame unit 1, such as Fig.12 As shown:

[0066] S41, install temporary tie rods 1012 to restore the overall arch frame to a "bow" shape, remove the overall arch frame from the arch rib 8, remove the transverse connector 102 in the order of "install later first remove", and restore to the state of the top-pushing arch frame single body 1 during installation;

[0067] S42, drag the push arch frame unit 1 laterally to the outside of the arch rib 8, use the cable hoist trolley 4 to lift the push arch frame unit 1 out of the bridge deck, release the transverse connector 102 and the tie rod 1012, disassemble it into arch frame segments 1011, dismantle all the arch frames, and transport the arch frame segments 1011 away from the site.

[0068] The present invention shortens the installation time of the overall arch frame. Compared with the installation of the arch frame by inclined-stayed buckle-hanging cantilever assembly, the push-up arch frame monomer 1 is assembled as a whole at the back-stage assembly site, which is synchronized with the construction period of the lower structure such as the arch seat 7, saving the overall construction period, and the overall hoisting construction period is shorter than the cantilever assembly construction period. The overall assembly of the push-up arch frame monomer 1 on site can reduce a large amount of high-altitude operations, improve construction efficiency, and ensure construction safety. The linear shape of the overall arch frame is easy to adjust and the linear shape of the overall arch frame is more in line with the linear shape of the arch rib 8. Compared with the inclined-stayed buckle-hanging system that adjusts the linear shape of the arch frame multiple times through cables and buckles, the linear shape of the single-piece arch frame 101 assembled on site is more convenient to control and adjust, and the assembly quality of the push-up arch frame monomer 1 is guaranteed.

[0069] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A method for integral installation and disassembly of a cast-in-place arch bridge arch frame, characterized in that: The following steps are involved: S1. Assembly of the push arch frame unit (1): The push arch frame monomer (1) is composed of a plurality of arch frame groups connected by transverse connecting pieces (102), each arch frame group is composed of two single-piece arch frames (101) connected by a plurality of transverse connecting pieces (102), the single-piece arch frame (101) is composed of a plurality of arch frame segments (1011) assembled and connected with tie rods (1012), and the arch frame segments (1011) are processed in a factory; S2. Pushing arch frame unit (1) Pushing-hoisting installation: S21, setting up a jacking site at one end of the arch bridge, the site being set along the longitudinal axis of the arch bridge, and installing a jacking track (2) and a jacking device (3); S22, hoisting the single unit of the jacking arch frame (1) to be erected onto the jacking track (2) and placing it in place; S23, using the pushing device (3) to push the pushing arch frame monomer (1) until the front end lifting point of the pushing arch frame monomer (1) reaches directly below the cable hoisting trolley (4), and then pausing the pushing; S24, installing a sling (5) at the front end of the push arch frame unit (1), connecting the sling (5) and the cable hoist trolley (4), lifting the cable hoist rope, and the front end weight of the push arch frame unit (1) is borne by the cable hoist trolley (4); S25, continue to push the arch frame monomer (1) forward, and the cable crane trolley (4) is synchronously pulled forward by the traction rope until the rear end lifting point of the arch frame monomer (1) arrives directly below another cable crane trolley (4); S26, stop pushing, install another lifting device (5) at the rear end of the pushing arch frame monomer (1), connect the lifting device (5) and the corresponding cable crane trolley (4), lift the lifting cable, the weight of the pushing arch frame monomer (1) is completely borne by the cable crane, the cable crane trolley (4) lifts the pushing arch frame monomer (1) forward and lowers it until the arch foot (6) is placed on the arch seat (7), and the arch foot (6) is temporarily locked; S27, repeating steps S22 to S26, installing the remaining push arch frame monomers (1), then applying the transverse connecting piece (102), all the push arch frame monomers (1) together form an integral arch frame, temporarily locking the arch frame arch foot (6), releasing the tie rod (1012), and completing the installation of the integral arch frame; S3. Arch rib casting: After the overall arch frame is installed, it is pre-stressed according to the requirements of relevant specifications. After the pre-stressing is qualified, the arch rib concrete is poured in sections and layers according to the design and construction requirements, and the arch rib concrete is cured to reach the design strength to form the arch rib (8). After the arch rib concrete reaches the design strength, the arch bridge deck is constructed (9); S4. Dismantling of the push arch unit (1): S41, installing temporary tie rods (1012) to restore the overall arch frame to a "bow" shape, dismounting the overall arch frame from the arch rib (8), and removing the transverse connecting pieces (102) in the order of "install later, remove first", to restore the state of the single push arch frame (1) during installation; S42, drag the push arch frame unit (1) laterally to the outside of the arch rib (8), use the cable hoist trolley (4) to lift the push arch frame unit (1) out of the bridge deck, release the transverse connecting parts (102) and the tie rods (1012), disassemble it into arch frame segments (1011), dismantle all the arch frames, and transport the arch frame segments (1011) away from the site.

2. The method for integrally installing and disassembling the arch frame of a cast-in-place arch bridge according to claim 1, characterized in that: The specific steps of step S1 are: S11, an assembly site for a push-pushing arch frame monomer (1) is set at one end of the bridge site, the processed arch frame segments (1011) are transported to the assembly site, and the single arch frame (101) is horizontally assembled according to the design line shape of the arch rib, the arch frame segments (1011) are connected by pins and bolts, and a tie rod (1012) is set between the two inner ends of the single arch frame (101), and the single arch frame (101) forms a "bow"-shaped arch system; S12, the single-piece arch frame (101) is adjusted to a vertical state by using a crane, and is fixed by using temporary supports and wind ropes, and a transverse connecting piece (102) is constructed between two single-piece arch frames (101) to form an arch frame group, and transverse connecting pieces (102) are constructed between several arch frame groups to form a push-up arch frame monomer (1).

3. The method for integrally installing and disassembling the arch frame of a cast-in-place arch bridge according to claim 2, characterized in that: In step S12, the distance between two single-piece arch frames (101) of the arch frame group is determined comprehensively based on the bearing capacity of the single-piece arch frame (101) and the load of the cast-in-place arch rib (8).

4. The method for integrally installing and disassembling the arch frame of a cast-in-place arch bridge according to claim 3 is characterized in that: In step S12, the number of arch frame groups of the jacking arch frame unit (1) is determined comprehensively based on the stability, jacking capacity and cable lifting capacity of the jacking arch frame unit (1). The minimum number of arch frame groups meets the stability requirements of the self-supporting state of the jacking arch frame unit (1), and the maximum number of arch frame groups does not exceed the jacking and cable lifting capacities.

5. The method for integrally installing and disassembling the arch frame of a cast-in-place arch bridge according to claim 4, characterized in that: In step S3, a plurality of arch columns (10) are installed on the arch ribs (8), and the arch bridge deck (9) is constructed on the arch columns (10).

6. The method for integrally installing and disassembling the arch frame of a cast-in-place arch bridge according to claim 5, characterized in that: The tie rod (1012) is made of precision-rolled threaded steel.

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