Construction method of a Y-shaped pier continuous rigid frame bridge

Abstract

The present invention discloses a construction method of a Y-shaped pier continuous rigid frame bridge, and relates to the field of bridge construction. During the construction, pile foundations and caps are constructed at the designed positions, vertical piers are constructed, temporary supports are installed on the tops of the vertical piers, temporary support frames are arranged between the vertical piers, the temporary supports, temporary support frames and vertical piers are used as formwork fulcrums, the beam body is cast, and a V-shaped support arm is constructed at the designed position on the vertical piers. After completion, the support arm template, temporary support and temporary support frame are removed to complete the construction. This construction scheme solves the problems in the existing scheme that not only the construction time is long and the construction site is large, the impact on the narrow area of ​​the city and the work site is very obvious, but also the temporary support is subjected to large force, the temporary support structure is complex, and the safety risk of construction is high.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a construction method of a Y-shaped pier continuous rigid frame bridge. Background Art

[0002] With the development of bridge construction technology, bridge design has gradually changed from simply satisfying structural safety and functional use to a design concept that takes into account both beautiful and unique bridge shapes and high quality. The Y-shaped pier rigid frame bridge structure system adopts a semi-integrated form, which not only reduces the size of the piers, but also increases the span of the continuous beam bridge and reduces the number of piers. In terms of appearance design, the bridge can be integrated into the surrounding environment to the greatest extent, making the entire bridge appear light and transparent.

[0003] However, the conventional construction plan for this type of bridge is to construct from bottom to top. This construction method often requires the use of a floor-standing support when constructing a V-shaped support arm. The floor-standing support of this structure must not only meet the support arm load, but also bear the load during the construction of the upper main beam. This construction plan not only takes a long time to construct and occupies a large construction site, but also has a significant impact on the city and the small work site. In addition, the temporary support is subject to large forces, the temporary support structure is complex, and the safety risk of construction is high. Summary of the invention

[0004] In view of the defects existing in the prior art, the purpose of the present invention is to provide a construction method for a Y-shaped pier continuous rigid frame bridge, which can solve the problem in the prior art that a temporary support frame is used to support the casting formwork of the V-shaped support arm, resulting in not only a long construction time and a large occupied construction site, but also a very obvious impact on the narrow area of ​​the city and the work site, and the temporary support is subjected to large force and the safety risk of construction is high.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0006] A construction method for a Y-shaped pier continuous rigid frame bridge is provided, which comprises the following steps:

[0007] Construct pile foundations and caps at the designed locations, and construct vertical piers;

[0008] Installing temporary supports on the tops of the vertical piers and setting temporary support frames between the vertical piers;

[0009] Using the temporary supports, temporary support frames and vertical piers as formwork fulcrums, pouring the beam body;

[0010] constructing V-shaped support arms at designed positions on the vertical piers;

[0011] Remove the support arm formwork, temporary support and temporary support frame to complete the construction.

[0012] Based on the above technical solutions,

[0013] In some optional solutions, constructing a pile foundation and a cap at the designed position of the vertical pier, and constructing the vertical pier on the cap, includes: constructing the pile foundation and the cap at the designed position of the vertical pier;

[0014] Install the slipform and sequentially construct the vertical piers to the bottom elevation of the V-shaped support arm;

[0015] After the construction of the vertical pier is completed, the slipform is removed.

[0016] In some optional solutions, the design position of the vertical pier is determined according to the design parameters of the bridge.

[0017] In some optional solutions, a temporary support frame is constructed and installed simultaneously with the construction of the vertical pier, and the temporary support is installed after the construction of the vertical pier is completed.

[0018] In some optional solutions, the method of casting the beam body by using the temporary support, temporary support frame and vertical pier as formwork fulcrums includes:

[0019] Selecting a mobile formwork according to the span of the bridge, the position of the temporary support and the position of the temporary support frame;

[0020] The bridge beam is cast in sections using the movable formwork.

[0021] In some optional solutions, the use of a mobile formwork to cast the bridge beam in sections includes:

[0022] Assemble the mobile formwork at the starting section of the bridge and pour the concrete of the first beam segment;

[0023] The mobile formwork moves to the position of the next beam segment to be cast, and casts the concrete of this beam segment until the casting of the entire bridge beam is completed.

[0024] In some optional solutions, a load test is carried out before casting the first beam segment.

[0025] In some optional solutions, the construction of the V-shaped support arm on the vertical pier includes:

[0026] Arrange steel strands at positions corresponding to the V-shaped support arms on the main beam;

[0027] Using the steel strands to lift the support arm template of the V-shaped support arm of the building to the designed position;

[0028] The steel bars of the V-shaped support arm are tied inside the support arm formwork, and concrete is poured.

[0029] In some optional schemes, after the construction of the V-shaped support arm on the vertical pier is completed, it also includes: removing the support arm template, temporary support and temporary support frame to complete the construction.

[0030] In some optional solutions, the removal of the support arm formwork, temporary support and temporary support frame to complete the construction includes:

[0031] After the concrete strength of the V-shaped support arm and the beam body reaches the design requirements, the temporary support frame and temporary support are removed;

[0032] Lower the support arm template and remove the steel strands.

[0033] Compared with the prior art, the advantages of the present invention are:

[0034] This construction method can reduce the construction time by first casting the main beam of the bridge and then constructing the V-shaped support arm based on the main beam body, which can also greatly reduce the area and number of temporary supports, reduce the construction safety risk, and reduce the impact on the surrounding environment. It can solve the problems in the prior art that not only the construction time is long and the construction site is large, the impact on the small area of ​​the city and the work site is very obvious, but also the temporary supports are subject to large forces, the temporary supports have complex structures, and the construction safety risks are high. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 It is a schematic diagram of construction step 1 in a construction method of a Y-shaped pier continuous rigid frame bridge of the present invention;

[0037] Figure 2 It is a schematic diagram of construction step 2 in a construction method of a Y-shaped pier continuous rigid frame bridge of the present invention;

[0038] Figure 3 It is a schematic diagram of construction step 3 in a construction method of a Y-shaped pier continuous rigid frame bridge of the present invention;

[0039] Figure 4 It is a schematic diagram of construction step 4 in a construction method of a Y-shaped pier continuous rigid frame bridge of the present invention;

[0040] Figure 5 The present invention is a schematic diagram showing the completion of the construction method of a Y-shaped pier continuous rigid frame bridge.

[0041] In the figure: 1. Vertical pier; 2. Slipform; 3. Temporary support; 4. Temporary support frame; 5. Mobile formwork; 6. Steel strand; 7. Support arm formwork; 8. V-shaped support arm. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0043] The following is a further detailed description of an embodiment of a construction method of a Y-shaped pier continuous rigid frame bridge of the present invention in conjunction with the accompanying drawings.

[0044] Figures 1-5 The following is a schematic diagram of the construction steps of a construction method for a Y-shaped pier continuous rigid frame bridge according to the present invention. The construction method comprises:

[0045] S1: Construct pile foundation and cap at the designed location, and construct vertical pier 1.

[0046] In some optional embodiments, step S1 specifically includes:

[0047] S11: construct pile foundation and cap at the designed position of vertical pier 1;

[0048] S12: Install the slipform 2, and sequentially construct the vertical pier 1 to the bottom elevation of the V-shaped support arm 8;

[0049] S13: After the construction of the vertical pier 1 is completed, the slipform 2 is removed.

[0050] The design position of the vertical pier 1 is determined according to the design parameters of the bridge.

[0051] In these optional embodiments, the slipform 2, as a common formwork in high pier construction, has the following advantages: first, the application of the slipform construction process can effectively reduce the application of two or three materials such as the formwork and the tie rod bolts for reinforcing the formwork, effectively saving material consumption during the construction process; second, the application of the slipform construction process effectively reduces the number of construction personnel during the construction process and reduces unnecessary personnel operations; third, it can effectively improve the speed of high pier construction; fourth, it can effectively reduce the cost consumption during the entire construction process. The vertical pier column 1 is constructed sequentially to the bottom elevation of the V-shaped support arm 8 to prepare for the subsequent installation of the temporary support 3.

[0052] The positions of the pile foundation and the cap need to be calculated in advance according to the span of the bridge and the number of temporary support frames 4 used. Reducing the number of required vertical piers 1 while ensuring the normal use of the bridge can reduce construction costs and save money.

[0053] S2: Install temporary supports 3 on the top of the vertical piers 1, and set temporary support frames 4 between the vertical piers 1;

[0054] In some optional embodiments, step S2 specifically includes:

[0055] The temporary support frame 4 is installed simultaneously during the construction of the vertical pier 1, and the temporary support 3 is installed after the construction of the vertical pier 1 is completed.

[0056] In these optional embodiments, the temporary support frame 4 and the vertical pier 1 are constructed at different positions and can be installed simultaneously without waiting until the vertical pier 1 is constructed and then being installed together with the temporary support 3 at the top of the vertical pier 1, thereby speeding up the construction progress and improving the construction efficiency.

[0057] S3: Cast the beam body with temporary support 3, temporary support frame 4 and vertical pier 1 as formwork support points;

[0058] In some optional embodiments, step S3 specifically includes:

[0059] Using temporary support 3, temporary support frame 4 and vertical pier 1 as formwork support points, pour the beam body, including:

[0060] S31: selecting a movable formwork 5 according to the span of the bridge, the position of the temporary support 3 and the position of the temporary support frame 4;

[0061] S32: Using the mobile formwork 5, the bridge beam is cast in sections.

[0062] The mobile formwork 5 is used to cast the bridge beam in sections, including:

[0063] S321: Assembling a movable formwork 5 at the starting section of the bridge and pouring concrete of the first beam segment;

[0064] S322: The mobile formwork 5 moves to the position of the next beam segment to be cast, and casts the concrete of the beam segment until the casting of the entire bridge beam is completed.

[0065] A load test is carried out before casting the first beam segment.

[0066] In these optional embodiments, the bridge beam is cast in sections and constructed as a whole in this way. The concrete shrinkage creep of the beam sections is small, and the linear shape of the beam does not change much after the overall completion, which is beneficial to improving the construction quality of the main beam and the quality of the project.

[0067] The formwork used is mobile formwork 5. The advantages of using mobile formwork 5 are simple process, short construction period, mechanized operation, high degree of automation, which is conducive to speeding up construction progress, reducing labor intensity and improving work efficiency; the process is repeated, easy to control and manage, and a set of formwork can be repeatedly used; there is no need to set up a bottom support, the construction occupies less space, and the impact on small areas of the city and the work site is reduced; the mobile formwork is constructed hole by hole, and the joint position is generally selected at the part of the bridge with less stress; the construction force is consistent with the force during operation, and there is no need to increase the construction stress steel bars, which can reduce the consumption of building materials.

[0068] The purpose of the load test is to detect the supporting capacity of the temporary support frame 4 and the temporary support 3 for the mobile formwork 5 to complete the entire process of beam casting, which helps to ensure the safety of the construction process and eliminate safety hazards in advance.

[0069] S4: constructing a V-shaped support arm 8 at the designed position on the vertical pier 1.

[0070] In some optional embodiments, step S4 specifically includes:

[0071] A V-shaped support arm 8 is constructed on the vertical pier 1, including:

[0072] S41: Arrange the steel strand 6 at the corresponding position of the V-shaped support arm 8 on the main beam;

[0073] S42: using the steel strand 6 to lift the support arm template 7 of the building V-shaped support arm 8 to the designed position;

[0074] S43: Tie the steel bars of the V-shaped support arm 8 in the support arm formwork 7 and pour concrete.

[0075] After the V-shaped support arm 8 is constructed on the vertical pier 1, the process also includes: removing the support arm template 7, the temporary support 3 and the temporary support frame 4 to complete the construction.

[0076] Remove the support arm template 7, temporary support 3 and temporary support frame 4 to complete the construction, including:

[0077] After the concrete strength of the V-shaped support arm 8 and the beam body reaches the design requirements, the temporary support frame 4 and the temporary support 3 are removed;

[0078] Lower the supporting arm formwork 7 and remove the steel strand 6.

[0079] In these embodiments, in this construction step, steel strands 6 are arranged at corresponding positions of the V-shaped support arms 8 on the main beam, and the V-shaped support arm templates 7 are arranged at pre-reserved positions, which can reduce the use of temporary support frames 4, minimize the occupation of construction sites, and reduce the impact on small areas of cities and work sites; the temporary support frames 4 are subject to large forces and have complex structures, and reducing the use of temporary support frames 4 can reduce safety risks in construction; using steel strands 6 to complete this operation can reduce the use of tools, and the steel strands 6 can simultaneously perform the functions of lifting and fixing, thereby improving work efficiency.

[0080] After the concrete strength reaches the design requirements, there is no need to use temporary support frames 4 and temporary supports 3 to support the bridge beam. The V-shaped support arm 8 of the Y-shaped pier can complete the support function. After removing the temporary support frame 4, temporary support 3, support arm formwork 7 and steel strand 6, the construction of the main structure of the bridge is completed.

[0081] In summary, this scheme provides a construction method for a Y-shaped pier continuous rigid frame bridge. The advantage of this scheme is that the number of temporary structures used is less than that of general construction methods, and less space is required, which reduces the impact on the small area of ​​the city and the work site; the temporary support frame 4 is subjected to large forces and has a complex structure. Reducing the use of the temporary support frame 4 can reduce the safety risk of construction; the main beam is constructed using a mobile formwork 5, so that the main beam structure has high construction quality, good integrity, and short construction time; during the bridge construction, temporary fulcrums are used to reduce the span of the bridge during construction, and the system conversion is carried out only after the overall construction of the bridge is completed. This construction method can reduce the cross-sectional height of the main bridge, reduce investment, and make the bridge look light and beautiful.

[0082] In the description of the present application, it should be noted that the terms "upper", "lower", etc. 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 application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0083] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0084] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A construction method for a Y-shaped pier continuous rigid frame bridge, It is characterized in that The construction method comprises the following steps: Constructing a pile foundation and a cap at the designed position of the vertical pier (1), and constructing the vertical pier (1) on the cap; Installing a temporary support (3) on the top of the vertical piers (1), and setting a temporary support frame (4) between the vertical piers (1); Using the temporary support (3), the temporary support frame (4) and the vertical pier (1) as formwork fulcrums, pouring the beam body; A V-shaped support arm (8) is constructed on the vertical pier (1).

2. A construction method for a Y-shaped pier continuous rigid frame bridge as claimed in claim 1, It is characterized in that The method of constructing a pile foundation and a cap at the designed position of the vertical pier (1), and constructing the vertical pier (1) on the cap, comprises: constructing the pile foundation and the cap at the designed position of the vertical pier (1); Installing the slipform (2), and sequentially constructing the vertical piers (1) to the bottom elevation of the V-shaped support arm (8); After the construction of the vertical pier (1) is completed, the slipform (2) is removed.

3. A construction method for a Y-shaped pier continuous rigid frame bridge as claimed in claim 2, Features: The design position of the vertical pier (1) is determined according to the design parameters of the bridge.

4. A construction method for a Y-shaped pier continuous rigid frame bridge as claimed in claim 2, Features: A temporary support frame (4) is installed simultaneously during the construction of the vertical pier column (1), and the temporary support (3) is installed after the construction of the vertical pier column (1) is completed.

5. The construction method of a Y-shaped pier continuous rigid frame bridge as claimed in claim 1, Features: The method of casting the beam body using the temporary support (3), the temporary support frame (4) and the vertical pier (1) as formwork fulcrums comprises: Selecting a movable formwork (5) according to the span of the bridge, the position of the temporary support (3) and the position of the temporary support frame (4); The movable formwork (5) is used to cast the bridge beam in sections.

6. A construction method for a Y-shaped pier continuous rigid frame bridge as claimed in claim 5, Features: The method of using the mobile formwork (5) to cast the bridge beam in sections comprises: Assembling the movable formwork (5) at the starting section of the bridge and pouring concrete for the first beam segment; The movable formwork (5) moves to the position of the next beam body segment to be cast, and casts the concrete of the beam body segment until the casting of the entire bridge beam body is completed.

7. A construction method for a Y-shaped pier continuous rigid frame bridge as claimed in claim 6, Features: A load test is carried out before casting the first beam segment.

8. The construction method of a Y-shaped pier continuous rigid frame bridge as claimed in claim 1, It is characterized in that The construction of the V-shaped support arm (8) on the vertical pier (1) comprises: Arranging a steel strand (6) at a position corresponding to the V-shaped support arm (8) on the main beam; Using the steel strands (6) to lift the support arm template (7) of the V-shaped support arm (8) to a designed position; The steel bars of the V-shaped support arm (8) are tied inside the support arm formwork (7), and concrete is poured.

9. The construction method of a Y-shaped pier continuous rigid frame bridge as claimed in claim 1, It is characterized in that After the V-shaped support arm (8) is constructed on the vertical pier (1), the method further includes: removing the support arm template (7), the temporary support (3) and the temporary support frame (4) to complete the construction.

10. A construction method for a Y-shaped pier continuous rigid frame bridge as claimed in claim 9, It is characterized in that The above-mentioned removal of the support arm template (7), the temporary support (3) and the temporary support frame (4) to complete the construction includes: After the concrete strength of the V-shaped support arm (8) and the beam body reaches the design requirements, removing the temporary support frame (4) and the temporary support (3); The support arm template (7) is lowered and the steel strand (6) is removed.

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