CN116163213A - Translation type aerial temporary operation platform for integrally assembling bridge steel structure sections and method thereof - Google Patents

Abstract

The invention discloses a translational aerial temporary work platform for the overall assembly of bridge steel structure segments and a method thereof. Equipment, temporary connection system and aerial work platform. The temporary connection system includes anchor beams; platform forward equipment includes self-moving beam structures, tracks and crawler cranes, and self-moving beam structures includes suspension beams, jacking equipment and mobile trolleys The aerial work platform includes a fixed end of the platform and a cantilever end of the platform located at the front end of the fixed end of the platform; It can be seen that the present invention transfers the ground work of the steel structure section of the main bridge to the air, integrates the advantages of the overall assembly of the section, and effectively reduces the impact of maritime affairs, ports and shipping on the premise of ensuring the construction quality.

Description

A translational aerial temporary work platform for the overall assembly of bridge steel structure segments and its method

technical field

The invention relates to a translational aerial temporary operation platform and a method thereof, belonging to the technical field of bridge construction.

Background technique

Before the steel structure assembly construction, the selection of the construction plan needs to focus on the following aspects: the water conservancy and flood control assessment of the construction plan, the impact of the temporary measures adopted in the construction plan on the waterway, and the safety of the temporary construction measures.

There are two main methods of bridge assembly, one is the segmental overall hoisting process, and the other is the bracket assembly process.

Generally, the overall segmental hoisting process usually means that after the assembly is completed in the temporary assembly site, the entire segment is transported to the top of the bridge position by a transport ship after being assembled on the water, and the overall segment of the main span is installed by a bridge deck crane. The biggest advantage of this process is that it is mature, requires less investment in temporary facilities, and has the best economic benefits. It is beneficial to the control of the overall welding quality and linearity of the steel structure. It has construction precedents throughout the country, such as Ningbo Sanguantang Bridge.

However, the overall hoisting process of the segment has the following difficulties: transportation problems on the river for the segment, dredging of the channel, difficulty in transporting and launching components of the large segment, occupying the main channel, and causing the channel to be closed.

The bracket assembly process is to set up a temporary support system in the river, complete the segmental assembly, and then proceed to the overall assembly. The main difficulty of this construction method is that in the turning area of the waterway, especially when the bracket assembly process is used in the turning area of the waterway with a large angle, in order to ensure the safety of the temporary construction measures, the design of the temporary support structure is extremely difficult. The reason is that in order to ensure the turning The bottom edge of the channel on both sides of the area is misaligned. Therefore, the span of the beam of the temporary support structure is large, and the span of the beam is too large, which will affect the clear height of the navigation. Have again, also there is the potential safety hazard of the water transport traffic accident of transport ship collision temporary support.

Contents of the invention

Aiming at the deficiencies of the prior art, the invention provides a translational aerial temporary operation platform and a method thereof. The translational aerial temporary work platform as a whole includes two parts, one of which is a platform forward moving device, and the other part is an aerial work platform. The platform forward moving equipment is installed on the upper bridge deck of the last steel structure section that has been built, while the aerial work platform is installed as a cantilever and has two installation states, so that on the one hand, the aerial work platform can be used as the front of the platform. On the other hand, it can be used as a temporary work place for the steel structure section of the main bridge to be constructed, so that the assembly of the steel structure section can be completed on the aerial work platform, which is the bridge steel structure section Prepare for overall welding assembly. It can be seen that the present invention transfers the ground work of the steel structure section of the main bridge to the air, integrates the advantages of the overall assembly of the section, and effectively reduces the influence of maritime affairs, ports and shipping on the premise of ensuring the construction quality, and after the elevation According to calculations, the aerial work platform has no effect on the clear height of navigation.

For realizing above-mentioned technical purpose, the present invention will take following technical scheme:

A translational aerial temporary work platform for the overall assembly of bridge steel structure segments, built on the cantilever end of the current construction station set on the completed bridge steel structure, including platform forward moving equipment, temporary connection system and aerial work platform Operating platform, of which:

The temporary connection system includes anchoring beams; the anchoring beams include at least two groups, one group is installed on the left side truss of the bridge corresponding to the current construction station, and the other group is installed on the current On the truss on the right side of the bridge corresponding to the construction station, it is the anchoring steel beam on the right side;

The platform moving forward equipment includes a self-moving beam structure, a track and a crawler crane, while the self-moving beam structure includes a suspension beam, jacking equipment and a mobile trolley; the suspension beam spans the upper deck system of the current construction station. Setting, the mobile trolley consists of two groups, which are symmetrically installed on the lower surface of the suspension beam; the crawler is placed on the upper deck of the current construction station; The crawler crane is hoisted to the anchor beam on the corresponding side of the next construction station; the jacking equipment is suspended and installed on the lower surface of the suspension beam, and can make the mobile trolley install on the track at the corresponding position or make the mobile trolley break away from the track at the corresponding position ;

The aerial work platform includes a fixed end of the platform and a cantilever end of the platform located at the front end of the fixed end of the platform; the fixed end of the platform can be respectively fixedly connected with a suspension beam or an anchoring steel beam.

Preferably, the aerial work platform includes a platform truss system, a platform bottom connection and an end connection; the platform truss system includes two, corresponding to the left platform truss system and the right platform truss system; the left platform The truss system is consistent with the structure of the right platform truss system and arranged parallel to each other; The lower chords of the two side platform truss systems are connected through the platform bottom link at the position close to the end parallel link.

Preferably, the platform truss system includes platform truss upper chord, platform truss straight web, platform truss oblique web and platform truss lower chord; 1. The bottom chords of the platform truss are connected by several platform truss straight webs, and two adjacent platform truss straight webs are connected by the platform truss diagonals.

Preferably, the lower chord of the platform truss is provided with several platform beam connecting plates near the tail end, one side of the platform bottom link is connected with the platform beam connecting plate on the lower chord of the platform truss system on the left side, and the other side is connected with The platform beam connecting plate on the lower chord of the right platform truss system is connected.

Preferably, the platform bottom link includes a support beam and a bottom parallel link; the number of the support beam is three, corresponding to the first to third support beams, and the second support beam is located between the first and third support beams In between, the three supporting beams are arranged parallel to each other and equidistant; the bottom parallel connection includes two pairs of V-shaped frames, the two ends of the V-shaped frames are respectively connected with the second supporting beams, and the top points are connected with the first supporting Beam or third support beam connection;

The number of platform beam connecting plates is also three; the two ends of the three supporting beams are respectively connected to the corresponding side platform beam connecting plates.

Preferably, the end parallel connection includes a rectangular outer frame and connecting braces correspondingly connecting two diagonal lines of the rectangular outer frame; the rectangular outer frame is formed by surrounding four rods; The joints are all provided with a gusset plate.

Preferably, the left anchor beam includes two rows, one of which is installed on the upper chord of the left truss of the bridge, which is the first left anchor beam, and the other row is installed on the lower chord of the bridge left truss , is the second left anchor beam;

The right anchor beam includes two rows, one of which is installed on the upper chord of the right truss of the bridge, which is the first right anchor beam, and the other row is installed on the lower chord of the bridge right truss, which is the first Two right anchor beams;

The two rails are respectively supported by the first left anchor beam and the first right anchor beam.

Preferably, gaps are provided between the front ends of the left platform truss system and the right platform truss system or are connected by protective railings.

Another technical purpose of the present invention is to provide a translation method for the above-mentioned translational aerial temporary work platform for the overall assembly of bridge steel structure segments, including the following steps:

Step 1. Homework preparation

Prepare for the assembly of bridge steel structure segments to be spliced in the aerial work platform and the overall assembly with the completed bridge steel structure, including the following steps:

Step 1.1. Weld and fix the platform truss system on both sides of the aerial work platform and the anchor beams on both sides of the current construction station to realize the suspension of the aerial work platform on the bridge steel structure;

Step 1.2, release the connection between the aerial work platform and the suspension beam;

Step 1.3, the jacking cylinder is ejected;

Step 2. Preparation for shifting

After the current construction station completes the overall assembly of the bridge steel structure segments to be spliced, prepare for the aerial work platform to move forward to the next construction station, including the following steps:

Step 2.1. Install a set of anchor beams on both sides of the bridge steel structure corresponding to the next construction station; each set of anchor beams includes two layers, which are installed on the upper and lower chords of the truss system on the same side; each layer of anchor beams Each includes at least two anchor beams, and the anchor beams included in each layer are distributed at intervals along the longitudinal bridge direction of the bridge steel structure;

Step 2.2, use the crawler crane to hoist the track to the upper anchor beam corresponding to the next construction station for laying;

Step 2.3, the jacking cylinder is retracted to embed the mobile trolley under the suspension beam in the track on the corresponding side;

Step 2.4, fix the upper chords of the left platform truss system and the right platform truss system close to the tail end to the corresponding positions of the suspension beams, so that the aerial work platform is suspended on the suspension beams;

Step 2.5, release the connection between the aerial work platform and the anchor beams on both sides of the current construction station;

Step three, translation

Start the mobile trolley to move the mobile trolley forward until it drives the aerial work platform to move to the next construction station;

Repeat steps 1 to 3 until the overall assembly of the entire bridge steel structure segment is completed.

Based on above-mentioned technical purpose, with respect to prior art, the present invention has following advantage:

The construction method described in the present invention has the least impact on maritime affairs and port and navigation, and after the elevation measurement, the aerial work platform has no influence on the clear height of the navigation. Same construction quality as integral segment hoisting process.

Description of drawings

Fig. 1 is a structural representation of the translational aerial temporary work platform of the present invention;

Fig. 2 is a structural schematic diagram of the aerial work platform shown in Fig. 1 of the present invention being suspended and installed on a bridge steel structure;

Fig. 3 is a schematic structural view of the platform side truss system of the aerial work platform in Fig. 1;

Fig. 4 is a schematic structural view of the bottom parallel connection of the aerial work platform in Fig. 1;

Fig. 5 is a schematic structural view of the end parallel connection of the aerial work platform in Fig. 1;

Fig. 6 is a schematic diagram of using a crawler crane to hoist the current steel structure segment to the aerial work platform;

Figure 7 is a structural schematic diagram of the current steel structure segment being assembled on the aerial work platform and installed on the steel structure of the main bridge;

Fig. 8 is a structural schematic diagram of the steel structure section of the main bridge;

In the figure: 1-1, the upper deck system; 1-2, the lower deck system; 1-3, the upper chord of the left truss of the bridge; 1-4, the lower chord of the left truss of the bridge; 1-5, the bridge The upper chord of the right truss; 1-6, the lower chord of the right truss of the bridge; 2-1, the lower anchor beam; 2-2, the upper anchor beam; 3-1, the right truss system of the platform; 3-1-1 , platform truss upper chord; 3-1-2, platform truss straight web; 3-1-3, platform truss inclined web; 3-1-4, platform truss lower chord; 3-1-5, platform beam connection 3-2, truss system on the left side of the platform; 3-3, platform bottom connection; 3-4, protective railing; 3-5, end flat connection; 3-6, bottom flat connection; 3-7, support beam ;4-1. Suspension beam; 4-2. Rail transportation system; 5-The truss section of the last main bridge; 6-1. The anchor point of the lower chord; 6-2. The anchor point of the upper chord; Bridge truss segment; 8-crawler crawler.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. The relative arrangements, expressions and numerical values of components and steps set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the Authorized Specification. In all examples shown and discussed herein, any specific values should be construed as illustrative only, and not as limiting. Therefore, other examples of the exemplary embodiment may have different values.

As shown in Figures 1 to 8, the translational aerial temporary work platform for the overall assembly of bridge steel structure segments according to the present invention is built on the cantilever end of the current construction station set on the completed bridge steel structure. The translational aerial temporary work platform as a whole includes two parts, one of which is a platform forward moving device, and the other part is an aerial work platform. The platform moving equipment is installed on the upper bridge deck system 1-1 of the previous steel structure section 5 that has been built, while the aerial work platform is installed as a cantilever and has two installation states, so that on the one hand the aerial work platform It can be used as a support for the step-forward movement of the platform forward equipment, and on the other hand, it can be used as a temporary work place for the steel structure segment 7 to be constructed, so that the assembly of the steel structure segment can be completed on the aerial work platform, and it is a bridge steel structure Prepare for the overall welding assembly of the segment. It can be seen that the present invention transfers the ground work of the steel structure section of the main bridge to the air, integrates the advantages of the overall assembly of the section, and effectively reduces the influence of maritime affairs, ports and shipping on the premise of ensuring the construction quality, and after the elevation According to calculations, the aerial work platform has no effect on the clear height of navigation.

In the present invention, the translational aerial temporary work platform includes platform forward equipment, temporary connection system and aerial work platform, wherein:

The temporary connection system includes anchoring beams; the anchoring beams include at least two groups, one group is installed on the left truss system of the current construction station, which is the left anchoring beam, and the other group is installed on the current construction site. On the truss system on the right side of the station, it is the right anchoring steel beam;

The platform forward moving equipment includes a self-moving beam structure, a track and a crawler crane, while the self-moving beam structure includes a suspension beam 4-1, jacking equipment and a mobile trolley 4-2; the suspension beam 4-1 spans The upper deck system 1-1 of the current construction station is set, and the mobile trolley 4-2 includes two groups, which are symmetrically installed on the lower surface of the suspension beam 4-1; the crawler belt is placed on the upper deck system 1 of the current construction station -1 above; two rails are supported by the left and right anchor beams respectively and can be hoisted to the anchor beams on the corresponding side of the next construction station by crawler cranes; the jacking equipment is suspended and installed on the lower surface of the suspension beam 4-1 , and can impel the mobile trolley 4-2 to be installed in the track at the corresponding position or impel the mobile trolley 4-2 to break away from the track at the corresponding position;

The aerial work platform includes a fixed end of the platform and a cantilever end of the platform located at the front end of the fixed end of the platform; the fixed end of the platform can be respectively fixedly connected with one of the suspension beam 4-1 and the anchoring steel beam.

Preferably, the aerial work platform includes a platform truss system, a platform bottom connection 3-3 and an end parallel connection 3-5; the platform truss system includes two, corresponding to the left platform truss system 3-2 and The right platform truss system 3-1; the left platform truss system 3-2 and the right platform truss system 3-1 have the same structure and are arranged parallel to each other; the left platform truss system 3-2 and the right platform truss system 3-1 The tail ends of the two are connected into one body through the end parallel connection 3-5, and the bottom chords of the left platform truss system 3-2 and the right platform truss system 3-1 are close to the ends The position of the flat joint 3-5 is connected by the bottom joint 3-3 of the platform.

Preferably, the platform truss system includes platform truss upper chord 3-1-1, platform truss straight web 3-1-2, platform truss diagonal 3-1-3 and platform truss lower chord 3-1- 4. The upper chord 3-1-1 of the platform truss and the lower chord 3-1-4 of the platform truss are arranged parallel to each other, and several The platform truss straight webs 3-1-2 are connected, and two adjacent platform truss straight webs 3-1-2 are connected through the platform truss diagonals 3-1-3.

Preferably, the lower chord 3-1-4 of the platform truss is provided with several platform beam connecting plates 3-1-5 near the tail end, and one side of the platform bottom link 3-3 is connected to the left platform truss system 3-2. The platform beam connecting plate 3-1-5 on the lower chord of the platform truss system 3-1 is connected, and the other side is connected with the platform beam connecting plate 3-1-5 on the lower chord of the right platform truss system 3-1.

Preferably, the platform bottom link 3-3 includes a supporting beam 3-7 and a bottom connecting beam 3-6; the number of the supporting beams 3-7 is three, corresponding to the first to third supporting beams 3-7 , and the second support beam 3-7 is between the first and third support beams 3-7, the three support beams 3-7 are arranged parallel to each other and equidistant; The V-shaped frame, the two end points of the V-shaped frame are respectively connected with the second support beam 3-7, and the apex is connected with the first support beam 3-7 or the third support beam 3-7;

The number of platform beam connecting plates 3-1-5 is also three; the two ends of the three supporting beams 3-7 are respectively connected with the corresponding side platform beam connecting plates 3-1-5.

Preferably, the end parallel connection 3-5 includes a rectangular outer frame and connecting braces correspondingly connecting two diagonal lines of the rectangular outer frame; the rectangular outer frame is formed by surrounding four rods; Each enclosure point is provided with a gusset plate.

Preferably, the left anchoring beams include two rows, one of which is installed on the upper chord 1-3 of the left truss of the bridge, which is the first left anchoring beam 2-1, and the other row is installed on the left side of the bridge. On the lower chord 1-4 of the side truss, it is the second left anchor beam 2-2; the right anchor beam includes two rows, one of which is installed on the upper chord 1-5 of the bridge right truss, which is The first right anchor beam, and the other row is installed on the lower chord 1-6 of the right truss of the bridge, which is the second right anchor beam; at this time, the two tracks respectively pass through the first left anchor beam 2-1 1. The first right side anchor beam corresponds to the support. Specifically, an upper chord anchorage point 6-2 is provided at the corresponding position of the upper chord 1-3 of the left truss of the bridge for installing the second left anchor beam 2-2, and the lower chord 1-4 of the left truss of the bridge A lower chord anchorage point 6-1 is set at the corresponding position of the bridge for installing the first left anchor beam 2-1. Similarly, a corresponding anchor point is also set at the corresponding position of the bridge right truss for installing the corresponding Anchor beams.

Preferably, a gap is set between the front ends of the left platform truss system 3-2 and the right platform truss system 3-1 or is connected by a protective railing 3-4.

Based on the above-mentioned translational temporary aerial work platform for the overall assembly of bridge steel structure segments, the present invention provides a translation method for the translational aerial temporary work platform, comprising the following steps:

Step 1. Homework preparation

Prepare for the assembly of bridge steel structure segments to be spliced in the aerial work platform and the overall assembly with the completed bridge steel structure, including the following steps:

Step 1.1. Weld and fix the platform truss system on both sides of the aerial work platform and the anchor beams on both sides of the current construction station to realize the suspension of the aerial work platform on the bridge steel structure;

Step 1.2, release the connection between the aerial work platform and the suspension beam 4-1;

Step 1.3, the jacking cylinder is ejected;

Step 2. Preparation for shifting

After the current construction station completes the overall assembly of the bridge steel structure segments to be spliced, prepare for the aerial work platform to move forward to the next construction station, including the following steps:

Step 2.1. Install a set of anchor beams on both sides of the bridge steel structure corresponding to the next construction station; each set of anchor beams includes two layers, which are installed on the upper and lower chords of the truss system on the same side; each layer of anchor beams Each includes at least two anchor beams, and the anchor beams included in each layer are distributed at intervals along the longitudinal bridge direction of the bridge steel structure;

Step 2.2, use the crawler crane to hoist the track to the upper anchor beam corresponding to the next construction station for laying;

Step 2.3, the jacking cylinder is retracted, so that the mobile trolley 4-2 under the suspension beam 4-1 is embedded in the track on the corresponding side;

Step 2.4, fix the upper chords of the left platform truss system 3-2 and the right platform truss system 3-1 close to the tail end to the corresponding positions of the suspension beam 4-1, so that the aerial work platform is suspended on the suspension On beam 4-1;

Step 2.5, release the connection between the aerial work platform and the anchor beams on both sides of the current construction station;

Step three, translation

Start the mobile trolley 4-2, prompting the mobile trolley 4-2 to move forward until the aerial work platform is moved to the next construction station;

Repeat steps 1 to 3 until the overall assembly of the entire bridge steel structure segment is completed.

Example 1

This embodiment mainly explains the structural design of the aerial work platform, specifically as follows:

(1) Structural Design Principles

1) Meet the bearing capacity requirements under vertical load

The steel structure of the main bridge has a main span height of 6 meters. In order to meet the requirements for aerial assembly of steel structure segments, the structural height of the aerial work platform will be close to 8 meters. The truss structure system is selected to enhance the overall bearing capacity of the structure. At the same time, refer to the hanging basket structure of cantilever pouring concrete continuous beam construction for structural design, but due to the hoisting requirements of segmental components on the aerial work platform, the position directly above the cantilever end cannot be provided with horizontal and horizontal connections. Therefore, the overall structure design of the truss needs to consider the platform during construction. overall stability.

2) Meet the bearing capacity requirements under lateral load

The steel structure welding of the cantilever aerial work platform needs to be equipped with windproof measures. Therefore, the cantilever end of the platform will bear a large transverse wind load, which will have a great impact on the stability of the overall work platform and the structural force. It is necessary to control the design and calculation of the work platform. Fully consider the influence of lateral wind load.

3) To adapt to the influence of bridge cross slope

There is a 2% cross-slope in the cross-section of the super-large bridge structure, which causes the space elevation of the left and right trusses to be different, which affects the anchoring structure setting of the aerial work platform. Therefore, the rationality of platform anchorage measures under the influence of cross-slope must be considered in the design of the aerial work platform.

(2) Design of structural components

The main load-bearing structure of the aerial work platform adopts a truss structure, and the main truss chord adopts HW400×400×13×21, of which 10mm steel plates are attached to both sides of the upper chord to form a rectangular section, and the main truss straight web adopts HW300×300×10×15. The oblique web bar is designed with cross tie rods, and the oblique web bar in the front position of the lower front fulcrum adopts a double-piece 25a channel steel (legs and backs facing each other), and the rest of the position adopts a double-piece 20a channel steel (legs and backs facing each other) system.

Under the first three vertical bars of the truss, the supporting beams 3-7 of the double HW400 I-shaped steel segment members are set, and they are also used as the supporting beams 3-7 of the distribution beam of the operation platform. To increase the overall stability between the left and right trusses, the left and right trusses are connected horizontally at the ends of the trusses (double 20a channel steel). The structural design of the aerial work platform is shown in Figure 3-5.

(3) Structural anchor design

The main bridge adopts an all-welded steel structure system, so there is no additional temporary bolt system for construction. Therefore, the aerial work platform is connected to the main truss system of the main bridge through welds.

The boundary constraints of the aerial work platform are provided by "HM700 steel":

1) The section steel for connection (that is, the above-mentioned anchor beam) is located on the top plate of the chord of the main truss system of the main bridge, wherein the upper chord is leveled with wedge-shaped pads, and the lower chord is leveled with 30mm steel plates;

2) The aerial work platform is connected with the connecting section steel according to the external stiffening of the web, which not only balances the influence of the longitudinal slope on the installation accuracy, but also can adapt to the 2% transverse slope requirement of the main truss structure;

3) The upper chord reaction force is relatively small (less than 300kN), so the wedge block is connected by double-sided fillet welds, and no additional welds are set between the profile steel and the upper chord;

4) The reaction force of the lower chord is relatively large, and the section steel is welded to the lower chord web bar to bear the vertical reaction force. A 30mm pad is set between the section steel and the lower chord top plate for leveling, and the double-sided fillet weld is used to resist the horizontal reaction force;

5) A connection section steel is provided at the end of each segment of the upper and lower chords. The upper chord section steel can be welded on site or manufactured in the factory, but the lower chord section steel must be welded in the factory, otherwise it is more difficult to connect by overhead welding.

In addition, the asphalt pavement is poured after cleaning the welds of the upper chord roof, which has relatively low requirements on the appearance quality; fillet welds are used to connect the web members of the lower chord and the connecting steel, and between the lower chord roof and leveling pads. Among them, the fillet welds of the inner web and the top plate are cleaned by downward welding, which is relatively easy, and the fillet welds of the outer web need to be cleaned by overhead welding, which is more difficult. The platform anchorage design is shown in Figure 2.

(4) Check calculation of structural components

According to the cross-section design, Midas software is used to check the structure. When calculating, the external load is considered as 1600KN. At the same time, the transverse wind load of the vertical platform is considered, and the anchor load is applied according to the situation. Among the various rods, the double channel steel structure adopts the structure with the limbs and the back facing each other, and the outer margin of the structure is 270mm, that is, the net distance between the top and bottom plates of HW300×300×10×15 I-shaped steel.

The internal force calculation results of Midas show that the maximum stress of each member of the aerial work platform is 139Mpa, which meets the allowable stress method control value of 140Mpa. At the same time, Midas calculation software is used to check the overall stability of the aerial work platform. The calculation results show that the stability coefficient of the aerial work platform is 4.3, which meets the structural stability requirements.

Example 2

This embodiment mainly explains the forward movement of the aerial work platform during the bridge construction process, and the specific content is as follows:

After the construction of one section of the aerial work platform is completed, the work platform is moved to the next section for construction. The forward moving equipment of the work platform is an important part of the overall structure of the platform. The overall weight of the platform will exceed 60 tons, so the crawler crane used on the bridge deck cannot complete the forward movement of the platform. The project department has considered and designed a track camel movement equipment (referred to as forward movement equipment) to complete the overall forward movement of the platform .

As shown in Figure 1, the track moving equipment is set at the anchoring beam position, and 1-2 beams are added before the track is laid. After the overall lifting, install the track and the traversing trolley, and use the front moving power device to move forward and reach the designated position.

Example 3

This embodiment mainly explains the main span segment assembly process based on the above-mentioned aerial work platform, and the specific content is as follows:

3.1. Segment division of main span steel structure

(1) Determination of segment division

According to the construction situation of the steel structure aerial work platform of the main bridge, the project department divided the steel structure sections of the main bridge. The structure of the steel structure sections of the main bridge is shown in Figure 8, including the upper chord 9-1 of the main bridge section, In the lower chord, a rectangular space 9-3 can be formed between the end of the main bridge steel structure segment and the completed main bridge structure, which can effectively control the accumulation of assembly errors during the segment assembly process and ensure the overall line shape of the steel structure. The support point of the upper chord falls on the completed main bridge structure, which is conducive to the position adjustment of the whole segment while sharing the load of the aerial work platform.

(2) Determination of cross-sectional form

When the upper deck, the lower deck, and the upper and lower chords are all 2% transverse slopes, considering the installation and anchoring requirements of the aerial work platform, the original upper and lower deck decks are maintained with a 2% transverse slope, and the upper chord bottom plate and lower chord The upper and lower roof plates are adjusted to be horizontal. At the same time, in order to meet the requirements for the use of aerial work platforms, the upper deck is installed after the 1-1 middle cantilever plate. After the adjustment is completed, when the aerial work platform of the main span of the bridge is constructed, the lower anchor beam is located on the top surface of the lower chord (horizontal setting), and the bottom surface of the lower chord is adjusted to be horizontal to ensure the temporary stability of the truss installation in the early stage.

3.2. Segment assembly of crawler crane

After the aerial work platform is installed, the crawler crane is in place, and the gap between the anchor beams on the bridge deck is set to 7 meters. The maximum external dimension of the 100-ton crawler crane is 7780×6350 (length×width) mm, and the space for the crawler crane with a width of 7 meters can meet The crawler crane is moving, and the anchor beam can be used as a limit device for the crawler crane to a certain extent (the anchor beam at the end is lengthened), which can ensure the safety of the crawler crane. The segmental components are sent to the rear of the crawler crane through the bridge deck transportation equipment (limiting track + transport flatbed truck), and the segmental hoisting is completed by the crawler crane.

3.3. Walking jack adjustment

After the whole segment is assembled on the aerial work platform, the Liye walking jack completes the final position adjustment. The walking jack can use the two steps of "lifting" and "push" to realize the adjustment of the overall segment elevation and plane position to ensure that the main The overall alignment of the bridge is accurate.

Claims (9)

1. A translational aerial temporary work platform for the overall assembly of bridge steel structure segments, built on the cantilever end of the current construction station set on the completed bridge steel structure, characterized in that it includes platform forward moving equipment , temporary connection system and aerial work platform, among which: The temporary connection system includes anchoring beams; the anchoring beams include at least two groups, one group is installed on the left side truss of the bridge corresponding to the current construction station, and the other group is installed on the current On the truss on the right side of the bridge corresponding to the construction station, it is the anchoring steel beam on the right side; The platform moving forward equipment includes a self-moving beam structure, a track and a crawler crane, while the self-moving beam structure includes a suspension beam, jacking equipment and a mobile trolley; the suspension beam spans the upper deck system of the current construction station. Setting, the mobile trolley consists of two groups, which are symmetrically installed on the lower surface of the suspension beam; the crawler is placed on the upper deck of the current construction station; The crawler crane is hoisted to the anchor beam on the corresponding side of the next construction station; the jacking equipment is suspended and installed on the lower surface of the suspension beam, and can make the mobile trolley install on the track at the corresponding position or make the mobile trolley break away from the track at the corresponding position ; The aerial work platform includes a fixed end of the platform and a cantilever end of the platform located at the front end of the fixed end of the platform; the fixed end of the platform can be respectively fixedly connected with a suspension beam or an anchoring steel beam. 2. The translational aerial temporary work platform for the integral assembly of bridge steel structure segments according to claim 1, characterized in that, said aerial work platform comprises a platform truss system, a bottom joint of the platform and a flat joint at the end; The platform truss system includes two, corresponding to the left platform truss system and the right platform truss system; the left platform truss system is consistent with the right platform truss system and arranged parallel to each other; The tail ends of the two platform truss systems are connected as a whole through end parallel connections, and the bottom chords of the left platform truss system and the right platform truss system pass through at positions close to the end parallel connections. The bottom link of the platform is connected. 3. The translational aerial temporary work platform for the overall assembly of bridge steel structure segments according to claim 2, wherein the platform truss system includes platform truss upper chords, platform truss straight webs, platform trusses Diagonal web members and platform truss lower chords; platform truss upper chords and platform truss lower chords are arranged parallel to each other, and the platform truss upper chords and platform truss lower chords are connected by several platform truss straight web members. The straight webs of the trusses are connected through the diagonal webs of the platform trusses. 4. The translational aerial temporary work platform for the overall assembly of bridge steel structure segments according to claim 3, characterized in that the lower chord of the platform truss is provided with several pieces of platform beam connecting plates near the tail end, and the platform One side of the bottom link is connected to the platform beam connecting plate on the lower chord of the left platform truss system, and the other side is connected to the platform beam connecting plate on the lower chord of the right platform truss system. 5. The translational aerial temporary work platform for the overall assembly of bridge steel structure segments according to claim 4, characterized in that, the bottom connection of the platform includes a support beam and a bottom parallel connection; the number of the support beam There are three, corresponding to the first to third support beams, and the second support beam is between the first and third support beams, and the three support beams are arranged parallel to each other and equidistant; the bottom parallel connection includes two paired The V-shaped frame, the two end points of the V-shaped frame are respectively connected with the second support beam, and the apex is connected with the first support beam or the third support beam; The number of platform beam connecting plates is also three; the two ends of the three supporting beams are respectively connected to the corresponding side platform beam connecting plates. 6. The translational aerial temporary work platform for the overall assembly of bridge steel structure segments according to claim 5, characterized in that, the end parallel connection includes a rectangular outer frame and correspondingly connects the rectangular outer frame Connecting braces connected by two diagonal lines; the rectangular outer frame is formed by surrounding four rods; each connecting point is provided with a gusset plate. 7. The translational aerial temporary work platform for the overall assembly of bridge steel structure segments according to claim 6, characterized in that, the left anchor beams include two rows, one of which is installed on the left truss of the bridge On the upper chord of the bridge, it is the first left anchor beam, and the other row is installed on the lower chord of the left truss of the bridge, which is the second left anchor beam; The right anchor beam includes two rows, one of which is installed on the upper chord of the right truss of the bridge, which is the first right anchor beam, and the other row is installed on the lower chord of the bridge right truss, which is the first Two right anchor beams; The two rails are respectively supported by the first left anchor beam and the first right anchor beam. 8. The translational aerial temporary work platform for the overall assembly of bridge steel structure segments according to claim 7, characterized in that the gap between the front ends of the left platform truss system and the right platform truss system is set or connected by a protective railing. 9. A method for translation of the translational aerial temporary work platform for the overall assembly of bridge steel structure segments according to claim 1, characterized in that, comprising the steps of: Step 1. Homework preparation Prepare for the assembly of bridge steel structure segments to be spliced in the aerial work platform and the overall assembly with the completed bridge steel structure, including the following steps: Step 1.1. Weld and fix the platform truss system on both sides of the aerial work platform and the anchor beams on both sides of the current construction station to realize the suspension of the aerial work platform on the bridge steel structure; Step 1.2, release the connection between the aerial work platform and the suspension beam; Step 1.3, the jacking cylinder is ejected; Step 2. Preparation for shifting After the current construction station completes the overall assembly of the bridge steel structure segments to be spliced, prepare for the aerial work platform to move forward to the next construction station, including the following steps: Step 2.1. Install a set of anchor beams on both sides of the bridge steel structure corresponding to the next construction station; each set of anchor beams includes two layers, which are installed on the upper and lower chords of the truss system on the same side; each layer of anchor beams Each includes at least two anchor beams, and the anchor beams included in each layer are distributed at intervals along the longitudinal bridge direction of the bridge steel structure; Step 2.2, use the crawler crane to hoist the track to the upper anchor beam corresponding to the next construction station for laying; Step 2.3, the jacking cylinder is retracted to embed the mobile trolley under the suspension beam in the track on the corresponding side; Step 2.4, fix the upper chords of the left platform truss system and the right platform truss system close to the tail end to the corresponding positions of the suspension beams, so that the aerial work platform is suspended on the suspension beams; Step 2.5, release the connection between the aerial work platform and the anchor beams on both sides of the current construction station; Step three, translation Start the mobile trolley to move the mobile trolley forward until it drives the aerial work platform to move to the next construction station; Repeat steps 1 to 3 until the overall assembly of the entire bridge steel structure segment is completed.

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