Large-span bent cap cast-in-place support system suitable for double cylindrical piers and construction method

Abstract

The invention relates to the technical field of bridge construction, in particular to a large-span bent cap cast-in-place support system suitable for double cylindrical piers and a construction method. The large-span bent cap cast-in-place support system comprises a bracket supporting assembly and a bearing truss beam assembly which are arranged on a pier column; the bracket supporting assembly is anchored on the pier column to support the bearing truss beam assembly; the cast-in-place support system further comprises a displacement limiting assembly used for limiting displacement of the pier columns and the load-bearing truss beam assembly in the radial direction of the pier columns, and a load-bearing platform assembly is arranged above the load-bearing truss beam assembly. Through the bent cap cast-in-place support system, the bent cap cast-in-place support system has the advantages of being large in bearing capacity, large in spanning capacity, large in structural strength and rigidity, stable in structure, capable of reducing construction difficulty, low in construction cost, high in construction efficiency and capable of effectively shortening the construction period.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a cast-in-place bracket system and a construction method suitable for a double cylindrical pier large-span cap beam. Background Art

[0002] At present, the cap beam support systems of bridges mainly include hoop support systems, through-core steel rod support systems, and floor-standing steel pipe support systems. These support systems have the following construction problems: 1. The clamp support system cannot support the weight of large-span and large-volume cap beams through the friction between the clamp and the pier, which poses a great safety hazard in construction.

[0003] 2. The through-steel rod support system has a large cantilever load on the through-steel rod, and poor shear and bending resistance. It cannot support the weight of a large-span and large-volume cap beam, and there is a safety hazard of instantaneous breakage of the steel rod.

[0004] 3. The ground-mounted steel pipe support system is suitable for the construction of cap beams with lower heights. For cap beams with higher heights, there are problems such as poor stability of the support pressure rods and high cost of support materials. It requires the foundation to have a higher bearing capacity, high foundation treatment costs, and low construction efficiency.

[0005] Therefore, there is an urgent need for a cast-in-place support system and construction method suitable for double cylindrical pier large-span cap beams to solve the above-mentioned construction problems. Summary of the invention

[0006] In view of this, the purpose of the present invention is to propose a cast-in-place support system and construction method suitable for double-cylindrical pier large-span cap beams, which has large load-bearing capacity, large spanning capacity, high structural strength and stiffness, structural stability, reduced construction difficulty, low construction cost, high construction efficiency, and effectively shortened construction period.

[0007] Based on the above purpose, the present invention provides a cast-in-place support system suitable for a double cylindrical pier with a large span cap beam, comprising a corbel support assembly and a load-bearing truss beam assembly arranged on the pier column; the corbel support assembly is anchored on the pier column to support the load-bearing truss beam assembly; The cast-in-place support system also includes a displacement limiting assembly for limiting the displacement of the pier and the load-bearing truss beam assembly along the radial direction of the pier; A load-bearing platform assembly is arranged above the load-bearing truss beam assembly.

[0008] Preferably, the corbel support assembly comprises a corbel and a pre-buried steel rod arranged inside the pier column; The corbel support assembly also includes drawn and rolled threaded steel bars, which anchor the corbel to the pier through embedded steel rods. Steel mesh and steel pads are used to strengthen the pier structure at the corbel anchor point. It is suitable for supporting the entire support system and cap beam, and transferring the load to the pier.

[0009] Preferably, the load-bearing truss beam assembly is symmetrically arranged on both sides of the pier, and the load-bearing truss beam assembly includes an upper chord and a lower chord, two vertical rods are welded between the upper chord and the lower chord, and a plurality of diagonal rods are arranged between the upper chord and the lower chord, and the plurality of diagonal rods form a V-shaped structure, and the ends of the diagonal rods are respectively welded to the upper chord and the lower chord; A plurality of pull rods are arranged on the lower chord.

[0010] Preferably, an elevation adjustment assembly is installed between the corbel support assembly and the load-bearing truss beam assembly, the elevation adjustment assembly includes a support top seat and a support base, the support top seat includes a first steel plate and a first steel pipe arranged at the bottom of the first steel plate, and the lower chord is arranged at the top of the first steel plate; The support base includes a second steel plate and a second steel pipe arranged on the top of the second steel plate, and the second steel plate is arranged on the corbel body; The outer diameter of the first steel pipe is smaller than the inner diameter of the second steel pipe, and the second steel pipe is sleeved outside the first steel pipe, the interior of the first steel pipe is filled with concrete, the interior of the second steel pipe is filled with sand, and the bottom of the first steel pipe is on the upper surface of the sand in the second steel pipe; The second steel pipe is provided with a sand discharge hole connected with the interior thereof, and the height of the first steel pipe is controlled by adjusting the sand capacity inside the second steel pipe.

[0011] Preferably, a load-bearing platform assembly is installed on the load-bearing truss beam assembly to form a construction platform, which is suitable for supporting the cap beam and providing a construction platform.

[0012] Preferably, a displacement limiting assembly is welded on the load-bearing truss beam assembly and clamps the pier column, which is suitable for limiting the displacement of the pier column.

[0013] Preferably, the displacement limiting assembly includes an arc frame, which is symmetrically arranged along the pier. The displacement limiting assembly also includes a fixing rod and an angle code. The two arc frames are fixed by the fixing rod. The angle codes are respectively located at both ends of the fixing rod, and the angle codes are respectively welded to the upper chord rod and the end of the fixing rod.

[0014] Preferably, the upper chord rod is provided with a through groove, the arc surface frame has an arc surface portion, both ends of the arc surface portion are flat surfaces as connecting portions, and positioning blocks are formed on the flat surfaces; The arc parts of the two arc-surface frames wrap the outer edge surface of the pier column, and the positioning blocks on the two arc-surface frames contact each other; The upper chord rod is provided with a through slot horizontally, and fixing plates are formed at both ends of the through slot, and the fixing plates are located on the outer surface of the upper chord rod. Positioning plates are also formed at both ends of the through slot, and the positioning plates are located at the upper and lower sides of the upper chord rod; The connecting part of the arc frame is provided with an opening, the fixing plate is provided with an opening, the fixing rod passes through the connecting part of the two arc frames and the two fixing plates, two sections of symmetrically arranged thread grooves are formed on the fixing rod, and two nuts are also sleeved on the fixing rod, and the two arc frames are tightly wrapped around the outer surface of the pier column by screwing the two nuts to approach each other and drive the connecting part; The angle code is located between the fixing plate and the positioning plate, and is respectively welded to the ends of the upper chord rod and the fixing rod.

[0015] Preferably, the displacement limiting assembly also includes a plug plate, a slot is provided on the upper chord rod, the plug plate is U-shaped, and the open end of the plug plate straddles the fixing rod, is inserted into the slot and welded to the upper chord rod, and one side of the plug plate is in contact with the nut.

[0016] Preferably, a cast-in-place construction method for a double cylindrical pier large-span cap beam comprises the following construction steps: Step 1: pre-embed steel mesh and steel pads during the pier construction process, install steel bars, double-stretched fine-rolled threaded steel bars and corbels; Step 2: Installing a height adjustment component on the corbel support component, and adjusting the top surface elevation of the height adjustment component; Step 3: Make the load-bearing truss beam assembly at the construction site, weld the double-jointed steel vertical rod, lower chord rod, diagonal rod, and upper chord rod to form a truss-type load-bearing beam, install the truss-type load-bearing beam on the support surface of the elevation adjustment assembly, and install the tie rod to form the truss-type load-bearing beam into an overall skeleton structure; Step 4: Install a platform assembly on the upper chord of the load-bearing truss beam assembly to form a construction platform, and install a displacement limiting assembly on the upper chord of the load-bearing truss beam assembly to clamp the pier and limit the displacement of the pier.

[0017] Beneficial effects of the present invention: 1. The present invention adopts the cast-in-place support system of the cap beam, which has the effects of large load-bearing capacity, large spanning capacity, large structural strength and rigidity, structural stability, reduced construction difficulty, low construction cost, high construction efficiency, and effectively shortening the construction period; 2. The use of corbel support components can firmly anchor the corbel body on the pier column. The corbel body has high strength and rigidity, and the structural force is clear, providing sufficient support for the cap beam construction. It is easy to install and disassemble, does not require a floor stand, and has the effect of low construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a front view of the present invention; Figure 2 is a side view of the present invention; Figure 3 It is a structural schematic diagram of the corbel support assembly of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the curved frame of the present invention; Figure 5 It is a schematic diagram of the structure of the displacement limiting assembly and the pier column of the present invention; Figure 6 It is a schematic diagram of the internal structure of the elevation adjustment component of the present invention.

[0020] The numbers in the figure are: 1- pier column; 2- corbel support assembly; 21- corbel body; 22- steel bar; 23- tensioned fine-rolled threaded steel; 24- steel mesh; 25- steel pad; 3- elevation adjustment assembly; 31- support top seat; 32- support base; 33- sand discharge hole; 4- load-bearing truss beam assembly; 41- vertical rod; 42- lower chord rod; 43- diagonal rod; 44- upper chord rod; 441- fixed plate; 442- positioning plate; 45- pull rod; 5- load-bearing platform assembly; 6- displacement limit assembly; 61- arc frame; 611- arc portion; 612- connection portion; 613- positioning block; 62- fixed rod; 621- nut; 63- angle code; 64- plug plate; 7- guardrail. DETAILED DESCRIPTION

[0021] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] The first aspect of the present invention provides a cast-in-place support system suitable for double cylindrical piers with large span cap beams, such as Figure 1 As shown, it includes a corbel support assembly 2 and a load-bearing truss beam assembly 4 arranged on the pier 1; the corbel support assembly 2 is anchored on the pier 1 to support the load-bearing truss beam assembly 4; The cast-in-place support system also includes a displacement limiting assembly 6 for limiting the displacement of the pier 1 and the load-bearing truss beam assembly 4 along the radial direction of the pier 1 .

[0024] A load-bearing platform assembly 5 is arranged above the load-bearing truss beam assembly 4 .

[0025] like Figure 3 As shown, further: The corbel support assembly 2 includes a corbel and a pre-buried steel rod 22 disposed inside the pier 1; The corbel support assembly 2 also includes a pair of drawn fine-rolled threaded steel bars 23, which anchor the corbel to the pier through embedded steel rods 22, and use steel mesh 24 and steel pads 25 to strengthen the pier column 1 structure at the corbel anchor point, which is suitable for supporting the entire support system and cap beam, and transferring the load to the pier column 1.

[0026] In this embodiment, the corbel support assembly 2 can be used to firmly anchor the corbel body 21 on the pier 1. The corbel body 21 has high strength and rigidity, clear structural force, and provides sufficient support for the cap beam construction. It is easy to install and disassemble, does not require a floor stand, and has the effect of low construction cost.

[0027] like Figure 1 and Figure 6 As shown, further: An elevation adjustment assembly 3 is installed between the corbel support assembly 2 and the load-bearing truss beam assembly 4. The elevation adjustment assembly 3 includes a support top seat 31 and a support base 32. The support top seat 31 includes a first steel plate and a first steel pipe arranged at the bottom of the first steel plate. The lower chord 42 is arranged at the top of the first steel plate. The support base 32 includes a second steel plate and a second steel pipe arranged on the top of the second steel plate, and the second steel plate is arranged on the corbel body 21; The outer diameter of the first steel pipe is smaller than the inner diameter of the second steel pipe, and the second steel pipe is sleeved outside the first steel pipe, the interior of the first steel pipe is filled with concrete, the interior of the second steel pipe is filled with sand, and the bottom of the first steel pipe is on the upper surface of the sand in the second steel pipe; The second steel pipe is provided with a sand discharge hole 33 communicating with the interior thereof, and the height of the first steel pipe is controlled by adjusting the sand capacity inside the second steel pipe.

[0028] In this embodiment, the elevation adjustment component 3 is suitable for transferring loads, adjusting the elevation of the upper structure, and facilitating the disassembly of the upper structure for construction. The first steel plate and the first steel pipe are welded with resistance welding, and the second steel plate and the second steel pipe are welded with resistance welding; The height of the sand is adjusted to adjust the combined height of the entire structure. After the cap beam concrete is poured, the sand discharge holes are opened to remove the sand and lower the height of the entire structure, thereby lowering the height of the load-bearing truss beam assembly 4, the load-bearing platform assembly 5 and the cap beam formwork as a whole.

[0029] like Figure 1 As shown, further: The load-bearing truss beam assembly 4 is symmetrically arranged on both sides of the pier 1, and the load-bearing truss beam assembly 4 includes an upper chord 44 and a lower chord 42, two vertical rods 41 are welded between the upper chord 44 and the lower chord 42, and a plurality of diagonal rods 43 are also arranged between the upper chord 44 and the lower chord 42, and the plurality of diagonal rods 43 form a V-shaped structure, and the ends of the diagonal rods 43 are respectively welded to the upper chord 44 and the lower chord 42; A plurality of pull rods 45 are disposed on the lower chord 42 .

[0030] In this embodiment, the vertical rod 41, the lower chord rod 42, the diagonal rod 43, the upper chord rod 44 and the tension rod 45 are welded together to form a truss-type load-bearing beam, all of which are made of double-jointed steel; The above structure is used to improve the strength, rigidity and overall stability of the load-bearing beam structure, improve the load-bearing capacity and spanning capacity of the load-bearing beam, and has the advantages of easy installation, good turnover, and high construction efficiency. It is suitable for supporting the cap beam and platform components and transmitting to the elevation adjustment component 3.

[0031] like Figure 1 and Figure 2 As shown, further: The load-bearing platform assembly 5 is installed on the load-bearing truss beam assembly 4 to form a construction platform. The load-bearing platform assembly 5 is installed with a guardrail 7, which is suitable for supporting the cap beam and providing a construction platform.

[0032] In this embodiment, the load-bearing platform assembly 5 is installed on the load-bearing truss beam assembly 4 to form a construction platform, which is easy to install and disassemble, has a large load-bearing capacity, and forms a skeleton structure with high strength and rigidity and good overall stability.

[0033] like Figure 1 As shown, further: The displacement limiting assembly 6 is welded on the load-bearing truss beam assembly 4 and clamps the pier column 1, which is suitable for limiting the displacement of the pier column 1.

[0034] In this embodiment, the displacement limiting assembly 6 is welded on the load-bearing truss beam assembly 4 and clamped on both sides of the pier column 1, which can effectively limit the displacement of the pier column 1.

[0035] As an implementation method, Figure 4 and Figure 5 As shown, further: The displacement limiting assembly 6 includes an arc frame 61, which is symmetrically arranged along the pier 1. The displacement limiting assembly 6 also includes a fixing rod 62 and an angle code 63. The two arc frames 61 are fixed by the fixing rod 62. The angle code 63 is respectively located at both ends of the fixing rod 62, and the angle code 63 is respectively welded to the upper chord rod 44 and the end of the fixing rod 62.

[0036] The upper chord rod 44 is provided with a through slot, the arc surface frame 61 has an arc surface portion 611, and both ends of the arc surface portion 611 are flat surfaces as connecting portions 612, and positioning blocks 613 are formed on the flat surfaces; The arcuate parts 611 of the two arcuate frames 61 wrap around the outer edge of the pier column 1, and the positioning blocks 613 on the two arcuate frames 61 contact each other; The upper chord rod 44 has a through slot horizontally formed thereon, and fixing plates 441 are formed at both ends of the through slot, and the fixing plates 441 are located on the outer surface of the upper chord rod 44, and positioning plates 442 are also formed at both ends of the through slot, and the positioning plates 442 are located at the upper and lower sides of the upper chord rod 44; The connecting portion 612 of the arc frame 61 is provided with an opening, the fixing plate 441 is provided with an opening, the fixing rod 62 penetrates the connecting portions 612 of the two arc frames 61 and the two fixing plates 441, two sections of symmetrically arranged thread grooves are formed on the fixing rod 62, and two nuts 621 are sleeved on the fixing rod 62, and the two arc frames 61 are tightly wrapped around the outer surface of the pier 1 by screwing the two nuts 621 closer to each other and driving the connecting portion 612; The angle code 63 is located between the fixing plate 441 and the positioning plate 442 and is welded to the ends of the upper chord rod 44 and the fixing rod 62 respectively.

[0037] In this embodiment, the two arc-surface frames 61 are sequentially passed through the through grooves provided on the two upper chord rods 44, and the positioning blocks 613 of the two arc-surface frames 61 are contacted with each other, so that the arc-surface portion 611 is wrapped around the outer surface of the pier column 1, and then the fixing rod 62 is sequentially passed through the fixing plate 441, the connecting portion 612, the connecting portion 612, and the fixing plate 441, and the nut 621 is timely sleeved on the fixing rod 62 during the passing process, and the two nuts 621 are screwed close to each other and the connecting portion 612 is driven so that the two arc-surface frames 61 are tightly wrapped around the outer surface of the pier column 1, and then the angle code 63 is buckled on the upper chord rod 44 and is located between the fixing plate 441 and the positioning plate 442, and is respectively welded to the ends of the upper chord rod 44 and the fixing rod 62; The fixing rod 62 is fixed by welding the angle code 63 to the upper chord rod 44 and the end of the fixing rod 62. The purpose of the positioning piece 442 is to limit the structural instability caused by the possible desoldering of the angle code 63.

[0038] As an implementation method, Figure 5 As shown, further: The displacement limiting assembly 6 also includes an insert plate 64 , a slot is formed on the upper chord rod 44 , the insert plate 64 is in a U-shaped structure, and an open end of the insert plate 64 straddles the fixing rod 62 , is inserted into the slot and is welded to the upper chord rod 44 , and one side of the insert plate 64 is in contact with the nut 621 .

[0039] In this embodiment, the stable structure of the connection between the pier column 1 and the upper chord 44 can be strengthened by installing the plug plate 64 .

[0040] The present invention provides a cast-in-place construction method for a double cylindrical pier large-span cap beam, comprising the following construction steps: Step 1: During the construction of the pier 1, a steel mesh 24 and a steel backing plate 25 are embedded, and steel rods 22, a pair of drawn fine-rolled threaded steel bars 23 and a corbel are installed.

[0041] Step 2: Install the elevation adjustment component 3 on the corbel support component 2 and adjust the top surface elevation of the elevation adjustment component 3 .

[0042] Step 3: Make the load-bearing truss beam assembly 4 at the construction site, weld the double-piece steel vertical rod 41, the lower chord rod 42, the diagonal rod 43, and the upper chord rod 44 to form a truss-type load-bearing beam, install the truss-type load-bearing beam on the supporting surface of the elevation adjustment assembly 3, and install the pull rod 45 to form the truss-type load-bearing beam into an overall skeleton structure.

[0043] Step 4: Install a platform assembly on the upper chord 44 of the load-bearing truss beam assembly 4 to form a construction platform, and install a displacement limiting assembly 6 on the upper chord 44 of the load-bearing truss beam assembly 4 to clamp the pier 1 and limit the displacement of the pier 1.

[0044] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0045] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cast-in-place support system suitable for double cylindrical piers with large span cap beams, characterized in that: It includes a corbel support assembly and a load-bearing truss beam assembly arranged on the pier column; the corbel support assembly is anchored on the pier column to support the load-bearing truss beam assembly; The cast-in-place support system also includes a displacement limiting assembly for limiting the displacement of the pier and the load-bearing truss beam assembly along the radial direction of the pier; A load-bearing platform assembly is arranged above the load-bearing truss beam assembly.

2. The cast-in-place support system for double cylindrical piers and large-span cap beams according to claim 1 is characterized in that: The corbel support assembly comprises a corbel and a pre-buried steel rod arranged inside the pier column; The corbel support assembly also includes drawn and rolled threaded steel bars, which anchor the corbel to the pier through embedded steel rods. Steel mesh and steel pads are used to strengthen the pier structure at the corbel anchor point. It is suitable for supporting the entire support system and cap beam, and transferring the load to the pier.

3. A cast-in-place support system suitable for double cylindrical piers with large span cap beams according to claim 2, characterized in that: The load-bearing truss beam assembly is symmetrically arranged on both sides of the pier, and the load-bearing truss beam assembly includes an upper chord and a lower chord, two vertical rods are welded between the upper chord and the lower chord, and a plurality of diagonal rods are arranged between the upper chord and the lower chord, and the plurality of diagonal rods form a V-shaped structure, and the ends of the diagonal rods are respectively welded to the upper chord and the lower chord; A plurality of pull rods are arranged on the lower chord.

4. The cast-in-place support system for double cylindrical piers and large-span cap beams according to claim 3 is characterized in that: An elevation adjustment assembly is installed between the corbel support assembly and the load-bearing truss beam assembly, the elevation adjustment assembly includes a support top seat and a support base, the support top seat includes a first steel plate and a first steel pipe arranged at the bottom of the first steel plate, and the lower chord is arranged at the top of the first steel plate; The support base includes a second steel plate and a second steel pipe arranged on the top of the second steel plate, and the second steel plate is arranged on the corbel body; The outer diameter of the first steel pipe is smaller than the inner diameter of the second steel pipe, and the second steel pipe is sleeved outside the first steel pipe, the interior of the first steel pipe is filled with concrete, the interior of the second steel pipe is filled with sand, and the bottom of the first steel pipe is on the upper surface of the sand in the second steel pipe; The second steel pipe is provided with a sand discharge hole connected with the interior thereof, and the height of the first steel pipe is controlled by adjusting the sand capacity inside the second steel pipe.

5. The cast-in-place support system for double cylindrical piers and large-span cap beams according to claim 1 is characterized in that: The load-bearing platform assembly is installed on the load-bearing truss beam assembly to form a construction platform, which is suitable for supporting the cap beam and providing a construction platform.

6. The cast-in-place support system for double cylindrical piers and large-span cap beams according to claim 3 is characterized in that: The load-bearing truss beam assembly is welded with a displacement limiting assembly and clamps the pier column, which is suitable for limiting the displacement of the pier column.

7. The cast-in-place support system for double cylindrical piers and large-span cap beams according to claim 1 is characterized in that: The displacement limiting assembly includes an arc frame, which is symmetrically arranged along the pier. The displacement limiting assembly also includes a fixing rod and an angle code. The two arc frames are fixed by the fixing rod. The angle codes are respectively located at both ends of the fixing rod, and the angle codes are respectively welded to the upper chord rod and the end of the fixing rod.

8. The cast-in-place support system for double cylindrical piers and large-span cap beams according to claim 7, characterized in that: The upper chord rod is provided with a through slot, the arc surface frame has an arc surface portion, both ends of the arc surface portion are flat surfaces as connecting portions, and positioning blocks are formed on the flat surfaces; The arc parts of the two arc-surface frames wrap the outer edge surface of the pier column, and the positioning blocks on the two arc-surface frames contact each other; The upper chord rod is provided with a through slot horizontally, and fixing plates are formed at both ends of the through slot, and the fixing plates are located on the outer surface of the upper chord rod. Positioning plates are also formed at both ends of the through slot, and the positioning plates are located at the upper and lower sides of the upper chord rod; The connecting part of the arc frame is provided with an opening, the fixing plate is provided with an opening, the fixing rod passes through the connecting part of the two arc frames and the two fixing plates, two sections of symmetrically arranged thread grooves are formed on the fixing rod, and two nuts are also sleeved on the fixing rod, and the two arc frames are tightly wrapped around the outer surface of the pier column by screwing the two nuts to approach each other and drive the connecting part; The angle code is located between the fixing plate and the positioning plate, and is respectively welded to the ends of the upper chord rod and the fixing rod.

9. The cast-in-place support system for double cylindrical piers and large-span cap beams according to claim 8, characterized in that: The displacement limiting assembly also includes a plug plate, a slot is provided on the upper chord rod, the plug plate is in a U-shaped structure, and the open end of the plug plate straddles the fixing rod, is inserted into the slot and is welded to the upper chord rod, and one side of the plug plate is in contact with the nut.

10. A cast-in-place construction method for a double cylindrical pier with a large span cap beam, using the cast-in-place support system according to any one of claims 1 to 9, characterized in that: The construction steps include: Step 1: pre-embed steel mesh and steel pads during the pier construction process, install steel bars, double-stretched fine-rolled threaded steel bars and corbels; Step 2: Installing a height adjustment component on the corbel support component, and adjusting the top surface elevation of the height adjustment component; Step 3: Make the load-bearing truss beam assembly at the construction site, weld the double-jointed steel vertical rod, lower chord rod, diagonal rod, and upper chord rod to form a truss-type load-bearing beam, install the truss-type load-bearing beam on the support surface of the elevation adjustment assembly, and install the tie rod to form the truss-type load-bearing beam into an overall skeleton structure; Step 4: Install a platform assembly on the upper chord of the load-bearing truss beam assembly to form a construction platform, and install a displacement limiting assembly on the upper chord of the load-bearing truss beam assembly to clamp the pier and limit the displacement of the pier.

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