A construction method for a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam

Abstract

The present application discloses a construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam, which is first constructed by constructing the lower layer piers; then building a temporary construction platform on the lower layer piers, the temporary construction platform is set around the position to be constructed of the T-shaped cross-section cap beam connection section; laying a bottom template on the temporary construction platform, tying steel bars on the bottom template as the peripheral steel bar structure of the T-shaped cross-section cap beam connection section; inserting the connecting bars into the gap of the peripheral steel bar structure, and tying and fixing the connecting bars; using side templates to surround the peripheral steel bar structure of the T-shaped cross-section cap beam connection section, the connecting bars pass through the side templates, the side templates and the bottom templates constitute the casting cavity of the cap beam connection section, pouring concrete into the casting cavity to cast and form the lower structure of the T-shaped cross-section cap beam connection section; building the template of the upper structure of the T-shaped cross-section cap beam connection section, and casting the upper structure of the T-shaped cross-section cap beam connection section. The present application has the effect of facilitating the construction of large-section cap beams.

Description

Technical Field

[0001] The present application relates to the field of cap beam construction, and in particular to a construction method of a double-layer cap beam with a reserved lower layer of a cap beam having a T-shaped cross-section. Background Art

[0002] To construct two overpasses above the main road, it is necessary to have a common pier section at the intersection of the two overpasses, and the common pier section is a double-layer cap beam structure. The common pier section is divided into an upper pier column and a lower pier column. The upper pier column and the lower pier column are the connecting section of the cap beam. The sides of adjacent connecting sections facing each other are equipped with exposed connecting bars. When constructing the lower cap beam between adjacent connecting sections, the connecting bars of the adjacent connecting sections are connected by steel bars to form the steel bar structure of the lower cap beam, and then the lower cap beam is cast. Finally, the upper cap beam is constructed on the upper end of the upper pier column, and the overpass is constructed on the cap beam.

[0003] In the related art, climbing formwork is usually used to construct the upper piers, the connecting sections of the cap beams and the upper piers. The climbing formwork is horizontally penetrated with through holes for the connecting bars to pass through. When pouring the connecting section, the steel bars are first tied and the prestressed hole tubes are installed at the connecting section position. Then the climbing formwork is raised to the connecting section position. Then the connecting bars are passed through the through holes on the outside of the climbing formwork and inserted into the steel bars of the connecting section. Finally, the connecting section is poured.

[0004] With regard to the above-mentioned related technologies, there are the following defects: when faced with the problem of increasing the bearing capacity of the cap beam, conventional climbing formwork construction is adopted, and the diameters of the cast lower piers, connecting sections and upper piers must be consistent. It is difficult to change the cross-sectional structure of the connecting section and the cap beam according to actual needs, and it is difficult to increase the bearing capacity of the cap beam by expanding the connecting section and the cross-section of the cap beam. Therefore, there is still room for improvement. Summary of the invention

[0005] In order to facilitate the construction of a large-section cap beam, the present application provides a construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam.

[0006] The construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam provided in the present application adopts the following technical solution:

[0007] A construction method for a double-layer cap beam with a reserved lower layer of a cap beam having a herringbone-shaped cross section, comprising the following steps:

[0008] S1: First construct the lower pier column, and then connect the steel bars on the top of the lower pier column to serve as the central steel bar structure of the connecting section of the herringbone-shaped cap beam;

[0009] S2: A temporary construction platform is built on the lower pier column, and the temporary construction platform is set up at the waiting construction position of the connection section of the herringbone cap beam;

[0010] S3: Lay the bottom formwork on the temporary construction platform, the bottom formwork is set around the outer periphery of the lower pier, and then tie the steel bars on the bottom formwork as the outer reinforcement structure of the connecting section of the herringbone-shaped cap beam;

[0011] S4: insert the connecting reinforcement into the gap of the peripheral reinforcement structure of the connecting section of the herringbone-shaped cap beam, and tie and fix the connecting reinforcement;

[0012] S5: Use side formwork to surround the outer steel bar structure of the connection section of the cap beam with a T-shaped section, the connection bars penetrate the side formwork, the side formwork and the bottom formwork form a casting cavity of the connection section of the cap beam, and pour concrete into the casting cavity to form the lower structure of the connection section of the cap beam with a T-shaped section;

[0013] S6: Build the template of the upper structure of the U-shaped section cap beam connection section, and cast the upper structure of the U-shaped section cap beam connection section.

[0014] By adopting the above technical scheme, a temporary construction platform is first built, and the temporary construction platform is used as the support system for constructing the T-section cap beam connection section. The bottom formwork is directly laid on the temporary construction platform, and then the outer reinforcement structure of the T-section cap beam connection section is constructed. The steel bar binding steps, the connecting bar plug-in and fixation steps, and the side formwork placement steps are all carried out on the temporary construction platform, which facilitates the safe construction of the large-section cap beam.

[0015] Preferably, in S4, a plurality of push plates are arranged in the temporary construction platform, and the plurality of push plates are distributed on the surrounding side of the outer reinforcement structure of the connecting section of the herringbone-shaped cap beam; a plurality of positioning holes are opened through the push plates, and the plurality of positioning holes correspond to a plurality of connecting bars one by one, and the connecting bars are passed through the corresponding positioning holes; the temporary construction platform is provided with a driving member, and the driving member drives the push plates to move toward the outer reinforcement structure until the end of the connecting bar is inserted into the outer reinforcement structure.

[0016] By adopting the above technical solution, the push plate with positioning holes plays a positioning role for multiple connecting bars. Under the drive of the driving member, the push plate and several connecting bars are moved as a whole, and several connecting bars are inserted into the outer steel structure simultaneously, which is beneficial to improving the installation efficiency of the connecting bars and the accuracy of the installation position.

[0017] Preferably, a limiting member is provided on a side of the push plate away from the peripheral reinforcement structure, and an end of the connecting rib away from the peripheral reinforcement structure abuts against the limiting member.

[0018] By adopting the above technical solution, the limiting member can limit the connecting reinforcement and at the same time ensure that the distance by which the connecting reinforcement protrudes from the outer reinforcement structure is controllable and consistent, which is beneficial to improving the installation quality of the connecting reinforcement.

[0019] Preferably, the push plate is provided with a plurality of brackets, the plurality of brackets correspond one-to-one to a plurality of connecting ribs, the plurality of brackets are located below the corresponding connecting ribs, the length direction of the brackets is consistent with the length direction of the connecting ribs, and the connecting ribs are horizontally placed on the corresponding brackets.

[0020] Since the connecting bar is long, after the connecting bar is inserted into the positioning hole, the end of the connecting bar away from the positioning hole bends downward more severely. During the insertion process of the peripheral steel bar structure, under normal circumstances, manual assistance is still required, which affects the installation accuracy and increases the installation difficulty. By adopting the above technical solution, the bracket has a supporting effect on the connecting bar, which is beneficial to maintain the horizontality of the connecting bar, thereby improving the installation accuracy of the connecting bar and reducing the installation difficulty of the connecting bar.

[0021] Preferably, the bracket is arranged to penetrate the push plate, and when the connecting bar is inserted into the gap of the peripheral steel bar structure, the end of the bracket abuts against the outside of the peripheral steel bar structure and slides with the push plate.

[0022] When the structural strength of the outer reinforcement structure needs to be improved, the reinforcement binding needs to be tighter, which makes the support easily blocked by the reinforcement, resulting in the push plate being unable to move forward. By adopting the above technical solution, the support and the push plate are slidably matched, which is conducive to the smooth insertion of the connecting reinforcement into the gap of the outer reinforcement structure.

[0023] Preferably, after the connecting reinforcement is inserted into the peripheral reinforcement structure, the driving member drives the push plate to move in a direction away from the peripheral reinforcement structure until the connecting reinforcement is separated from the positioning hole; in S5, the side formwork is hoisted in front of the push plate and is close to the push plate, the support seat passes through the side formwork and lifts the side formwork, and one end of the connecting reinforcement protruding from the peripheral reinforcement structure is placed on the support seat; the driving member drives the push plate to move in the direction of the peripheral reinforcement structure, and during the movement of the push plate, the connecting reinforcement gradually passes through the side formwork, and the side formwork is finally pressed against the bottom formwork.

[0024] By adopting the above technical solution, the support passes through the side formwork and lifts up the side formwork so that the side formwork can move with the push plate while maintaining a stable vertical state, which is convenient for the side formwork and the connecting ribs to be smoothly plugged in. At the same time, before the side formwork and the connecting ribs are plugged in, the support can correct the corresponding ends of the connecting ribs in advance, so that the connecting ribs can be accurately aligned with the holes of the side formwork, which is conducive to quickly and smoothly completing the side formwork placement steps.

[0025] Preferably, a roller is provided at the bottom of the push plate, and the roller abuts against the surface of the temporary construction platform.

[0026] By adopting the above technical solution, the roller plays a role in reducing friction, which is conducive to the smooth and stable movement of the push plate.

[0027] Preferably, a groove is provided on the upper surface of the bracket, the length direction of the groove is consistent with the length direction of the bracket, and the connecting rib is accommodated in the groove.

[0028] By adopting the above technical solution, the grooves can accommodate and limit the connecting bars, which is beneficial for keeping the connecting bars level and reducing the probability of the connecting bars being offset when inserted into the peripheral steel bar structure.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. First, a temporary construction platform is built as the support system for the construction of the T-shaped cap beam connection section. The bottom formwork is laid directly on the temporary construction platform, and then the outer reinforcement structure of the T-shaped cap beam connection section is constructed. The reinforcement binding steps, the connection reinforcement plugging and fixing steps, and the side formwork positioning steps are all carried out on the temporary construction platform, which is convenient for the safe construction of the large-section cap beam;

[0031] 2. By using the push plate and the bracket to position and support the connecting ribs, it is helpful to maintain the horizontality of the connecting ribs, thereby improving the installation accuracy of the connecting ribs and reducing the installation difficulty of the connecting ribs;

[0032] 3. The side formwork is erected by sliding the support and the push plate through the side formwork, so that the side formwork and the connecting ribs can be smoothly plugged in. At the same time, before the side formwork and the connecting ribs are plugged in, the support can correct the corresponding ends of the connecting ribs in advance, so that the connecting ribs can be accurately aligned with the holes of the side formwork, which is conducive to quickly and smoothly completing the side formwork placement steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the positional relationship between the lower pier and the connecting section of the T-shaped cross-section cap beam in a construction method of a double-layer cap beam with a reserved lower T-shaped cross-section cap beam in an embodiment of the present application.

[0034] Figure 2 It is an overall schematic diagram of various components after the side formwork is in place in a construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam in an embodiment of the present application.

[0035] Figure 3 It is a schematic diagram of the structural position relationship within a temporary construction platform in a construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam in an embodiment of the present application.

[0036] Figure 4 It is a schematic diagram of the state after the connecting ribs are inserted into the positioning holes of the push plate in a construction method of a double-layer cap beam with a reserved lower I-shaped cross-section in an embodiment of the present application (in order to avoid mutual obstruction, multiple groups of connecting ribs, limit members and brackets in the push plate are hidden, and only 4 groups are left for illustration).

[0037] Figure 5 It is a schematic diagram of the state when a push plate drives the side formwork to move in a construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam in an embodiment of the present application.

[0038] Explanation of the reference numerals in the accompanying drawings: 1. Lower pier; 2. Cap beam connecting section; 3. Connecting ribs; 4. Prestressed hole pipe; 5. Temporary construction platform; 51. Guardrail; 6. Central reinforcement structure; 7. Peripheral reinforcement structure; 8. Push plate; 81. Positioning hole; 82. Mounting groove; 83. Roller; 84. Limiting piece; 9. Side formwork; 10. Cylinder; 11. Support seat; 111. Groove; 12. Bottom formwork. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1-5 This application is described in further detail.

[0040] The present application embodiment discloses a construction method for a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam, referring to Figure 1 and Figure 2 , including the following steps:

[0041] S1: First, the lower pier column 1 is cast and constructed by means of climbing formwork construction, and then a long steel bar is connected to the top of the lower pier column 1 to serve as the central steel bar structure 6 of the connecting section 2 of the herringbone-shaped cap beam.

[0042] S2: Then remove the climbing formwork, and build a temporary construction platform 5 around the lower pier 1. The temporary construction platform 5 is set around the construction position of the connecting section 2 of the herringbone-shaped cap beam. A guardrail 51 is built around the temporary construction platform 5 to improve the safety of workers. In this embodiment, the temporary construction platform 5 is supported by a ground scaffold (not shown in the figure).

[0043] S3: Reference Figure 3 and Figure 4 , a bottom template 12 is laid on the surface of the temporary construction platform 5, and the bottom template 12 in a round shape is arranged around the outer periphery of the lower pier 1, and then steel bars are tied on the bottom template 12 to serve as the peripheral steel bar structure 7 of the herringbone-shaped cap beam connection section 2. In the process of tying steel bars circle by circle from bottom to top, the prestressed hole tube 4 is also installed and tied and fixed between the peripheral steel bar structure 7 and the central steel bar structure 6.

[0044] S4: Four upright push plates 8 are installed on the temporary construction platform 5, and the four push plates 8 are distributed around the peripheral steel reinforcement structure 7 of the herringbone-shaped cross-section cap beam connection section 2. The four push plates 8 correspond one-to-one to the four side surfaces of the cap beam connection section 2. A roller 83 is installed at the bottom of the push plate 8, and the roller 83 abuts against the surface of the temporary construction platform 5. The push plate 8 is provided with a plurality of positioning holes 81, and the plurality of positioning holes 81 correspond one-to-one to a plurality of connecting ribs 3, and the positioning holes 81 are distributed in a ring shape to meet the distribution requirements of the connecting ribs 3. The connecting ribs 3 are passed through the corresponding positioning holes 81.

[0045] In addition, four driving members are installed at the guardrail 51 of the temporary construction platform 5, and the four driving members correspond to the four push plates 8 one by one. The side of the push plate 8 facing the peripheral steel structure 7 is the front side of the push plate 8, and the side of the push plate 8 away from the peripheral steel structure 7 is the back side of the push plate 8. The driving member is specifically a cylinder 10, which is horizontally arranged, and the piston rod of the cylinder 10 is fixedly connected to the back side of the push plate 8. The cylinder 10 is extended to drive the push plate 8 to move toward the peripheral steel structure 7, so as to insert the connecting rib 3 into the gap of the peripheral steel structure 7 of the connecting section 2 of the herringbone-shaped cap beam.

[0046] In addition, in order to improve the installation quality of the connecting rib 3, a plurality of stoppers 84 are installed on the back of the push plate 8, and the plurality of stoppers 84 correspond to the plurality of positioning holes 81. Specifically, the stoppers 84 are L-shaped folded plate structures, and one end of the stoppers 84 away from the push plate 8 is bent downward and directly opposite to the positioning hole 81. After the connecting rib 3 is horizontally inserted into the positioning hole 81, the end of the connecting rib 3 away from the peripheral reinforcement structure 7 abuts against the end of the stoppers 84 away from the push plate 8, so that the insertion length of each connecting rib 3 remains consistent.

[0047] The push plate 8 is provided with a plurality of brackets 11, which correspond to the plurality of connecting ribs 3 one by one, and are located below the corresponding connecting ribs 3. The length direction of the brackets 11 is consistent with the length direction of the connecting ribs 3, and a groove 111 is provided on the upper surface of the brackets 11, and the length direction of the groove 111 is consistent with the length direction of the brackets 11, and the connecting ribs 3 are horizontally placed in the groove 111 on the corresponding brackets 11. After the connecting ribs 3 are inserted into the positioning holes 81, the end of the connecting ribs 3 away from the positioning holes 81 bends downward more severely, and the brackets 11 support the connecting ribs 3, which is conducive to maintaining the horizontality of the connecting ribs 3, thereby improving the installation accuracy of the connecting ribs 3, and also reducing the installation difficulty of the connecting ribs 3.

[0048] In this embodiment, the bracket 11 is arranged through the push plate 8, and the push plate 8 is provided with an installation groove 82 for the bracket 11 to pass through. When performing the installation step of the connecting rib 3, the cylinder 10 is started to push the push plate 8 to move toward the peripheral reinforcement structure 7, and drive the connecting rib 3 to be inserted into the gap of the peripheral reinforcement structure 7. During the process of inserting the connecting rib 3 into the gap of the peripheral reinforcement structure 7, the end of the bracket 11 facing the peripheral reinforcement structure 7 abuts against the outside of the peripheral reinforcement structure 7 and slides with the push plate 8. The connecting rib 3 is directly inserted into the gap of the peripheral reinforcement structure 7, and most of it is hidden.

[0049] After the connecting bar 3 is inserted into the peripheral reinforcement structure 7, the cylinder 10 contracts and drives the push plate 8 to move away from the peripheral reinforcement structure 7, thereby forcing the connecting bar 3 to separate from the positioning hole 81. After the connecting bar 3 is separated from the positioning hole 81, the worker ties and fixes the connecting bar 3 and the peripheral reinforcement structure 7 to improve the connection stability of the connecting bar 3 and the peripheral reinforcement structure 7, thereby improving the stability between the cap beam and the pier column.

[0050] S5: Reference Figure 5 After the connection ribs 3 are installed, the side template 9 is lifted to the front of the corresponding push plate 8 by a crane. In the embodiment of the present application, the side template 9 is provided with a plurality of escape slots, which correspond to and fit with a plurality of brackets 11. The brackets 11 penetrate the escape slots of the side template 9 and lift the side template 9, and one end of the connection ribs 3 protruding from the peripheral reinforcement structure 7 is placed on the brackets 11. At the same time, the side template 9 is pressed against the front of the push plate 8 to keep the side template 9 upright.

[0051] When installing the side formwork 9, the cylinder 10 drives the push plate 8 to move toward the outer reinforcement structure 7. During the movement of the push plate 8, the connecting rib 3 gradually penetrates the corresponding hole position of the side formwork 9 under the guidance of the bracket 11, and the side formwork 9 is finally pressed against the bottom formwork 12.

[0052] After all the side formworks 9 are in place, the side formworks 9 are arranged around the outer peripheral steel structure 7 of the T-section cap beam connection section 2, and then the side formworks 9 are locked by tensioning and locking, and sealed. The side formworks 9 and the bottom formwork 12 form a casting cavity of the cap beam connection section 2, and concrete is poured into the casting cavity to cast and form the lower structure of the T-section cap beam connection section 2.

[0053] S6: Build the template for the upper structure of the T-shaped section cap beam connection section 2. The template adopts a conventional aluminum alloy template. The template can be assembled with the lower side template, and the upper structure of the T-shaped section cap beam connection section 2 is cast. Finally, the connection section of the T-shaped section cap beam is completed to facilitate the construction of the large-section cap beam.

[0054] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A construction method for a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam, characterized in that: The following steps are involved: S1: First construct the lower pier column (1), then extend the steel bars at the top of the lower pier column (1) to serve as the central steel bar structure (6) of the connecting section (2) of the herringbone-shaped cap beam; S2: Building a temporary construction platform (5) on the lower pier (1), the temporary construction platform (5) being arranged around the position to be constructed of the connecting section (2) of the cap beam with a herringbone cross section; S3: laying a bottom formwork (12) on the temporary construction platform (5), the bottom formwork (12) being arranged around the outer periphery of the lower pier column (1), and then tying steel bars on the bottom formwork (12) to serve as the outer reinforcement structure (7) of the herringbone-section cap beam connection section (2); S4: inserting the connecting bar (3) into the gap of the peripheral steel bar structure (7) of the connecting section (2) of the herringbone-shaped cap beam, and tying and fixing the connecting bar (3); S5: Using a side formwork (9) to surround the outer steel reinforcement structure (7) of the T-shaped cross-section cap beam connection section (2), the connection reinforcement (3) passes through the side formwork (9), the side formwork (9) and the bottom formwork (12) form a casting cavity of the cap beam connection section (2), and concrete is poured into the casting cavity to cast and form the lower structure of the T-shaped cross-section cap beam connection section (2); S6: constructing a template for the upper structure of the U-shaped cross-section cap beam connection section (2), and casting the upper structure of the U-shaped cross-section cap beam connection section (2).

2. The construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam according to claim 1 is characterized in that: In the S4, a plurality of push plates (8) are arranged in the temporary construction platform (5), and the plurality of push plates (8) are distributed around the peripheral steel structure (7) of the connecting section (2) of the herringbone-shaped cap beam; a plurality of positioning holes (81) are opened through the push plate (8), and the plurality of positioning holes (81) correspond to a plurality of connecting bars (3) one by one, and the connecting bars (3) are passed through the corresponding positioning holes (81); the temporary construction platform (5) is provided with a driving member, and the driving member drives the push plate (8) to move toward the peripheral steel structure (7) until the end of the connecting bar (3) is inserted into the peripheral steel structure (7).

3. The construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam according to claim 2 is characterized in that: A limiting member (84) is provided on the side of the push plate (8) facing away from the peripheral steel structure (7), and one end of the connecting rib (3) away from the peripheral steel structure (7) abuts against the limiting member (84).

4. The construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam according to claim 3 is characterized in that: The push plate (8) is provided with a plurality of brackets (11), the plurality of brackets (11) correspond to the plurality of connecting ribs (3) one by one, the plurality of brackets (11) are located below the corresponding connecting ribs (3), the length direction of the brackets (11) is consistent with the length direction of the connecting ribs (3), and the connecting ribs (3) are horizontally placed on the corresponding brackets (11).

5. The construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam according to claim 4 is characterized in that: The support seat (11) is arranged to penetrate the push plate (8), and when the connecting rib (3) is inserted into the gap of the peripheral steel structure (7), the end of the support seat (11) abuts against the outside of the peripheral steel structure (7) and slides with the push plate (8).

6. The construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam according to claim 5, characterized in that: After the connecting rib (3) is inserted into the outer reinforcement structure (7), the driving member drives the push plate (8) to move in a direction away from the outer reinforcement structure (7) until the connecting rib (3) is separated from the positioning hole (81); in S5, the side template (9) is hoisted in front of the push plate (8), the support seat (11) penetrates the side template (9) and raises the side template (9), and the end of the connecting rib (3) protruding from the outer reinforcement structure (7) is placed on the support seat (11); the side template (9) is tightly attached to the push plate (8), and the driving member drives the push plate (8) to move in the direction of the outer reinforcement structure (7). During the movement of the push plate (8), the connecting rib (3) gradually penetrates the side template (9), and the side template (9) is finally pressed against the bottom template (12).

7. The construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam according to claim 2, characterized in that: A roller (83) is provided at the bottom of the push plate (8), and the roller (83) abuts against the surface of the temporary construction platform (5).

8. The construction method of a double-layer cap beam with a reserved lower layer of a T-shaped cross-section cap beam according to claim 4, characterized in that: The upper surface of the bracket (11) is provided with a groove (111), the length direction of the groove (111) is consistent with the length direction of the bracket (11), and the connecting rib (3) is accommodated in the groove (111).

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