Large-cantilever prestressed bent cap of steel tube bailey beam unpass-keeping support and construction method of large-cantilever prestressed bent cap

Abstract

The construction method comprises the following steps: step 1, foundation and pier column construction: constructing a pile foundation, casting a bearing platform at the upper end of a foundation pile in situ, arranging a pre-embedded anchoring base and a reverse pre-pressing anchor rod when the bearing platform is constructed, and welding and fixing the reverse pre-pressing anchor rod and a reinforcement cage of the bearing platform; pier column construction is conducted on the upper portion of the bearing platform; secondly, a prefabricated concrete bottom plate is constructed; thirdly, steel pipe piles are installed, wherein the steel pipe piles are installed on the bearing platform and the prefabricated concrete bottom plate; setting supports are installed between the steel pipe piles; 4, top structure installation of the capping beam support: installing a sand box at the top of the steel pipe pile; installing a cross beam, a bailey beam and a distribution beam on the upper part of the sand box in sequence; a bottom template and a side template are mounted at the upper part of the distribution beam; step 5, pre-pressing the bracket; and 6, constructing a bent cap. The construction efficiency and quality are effectively improved, the construction cost is reduced, and important practical value is achieved.

Description

Technical Field

[0001] The invention relates to a steel tube Bailey beam support bracket with a large cantilever prestressed cap beam, in particular to a steel tube Bailey beam support bracket with a large cantilever prestressed cap beam and a construction method. Background Art

[0002] With the rapid development of urban transportation construction in my country, especially the extensive construction of urban viaducts, these elevated structures have effectively alleviated the problem of road congestion. In the process of applying the large cantilever cap beam support system to municipal highway construction, the system ensures the traffic capacity of urban roads and meets the mechanical requirements of the support beam by setting up multiple columns to support the crossbeam of the cap beam support. However, this multi-column continuous beam system also brings challenges to the traffic on the ground road under the bridge, because the moving vehicles need to avoid these support columns, resulting in the number of lanes on the ground road having to be reduced, which in turn aggravates the traffic burden on the ground. Therefore, it is particularly important to develop a new type of large cantilever cap beam support.

[0003] To sum up, for the construction of large cantilever prestressed cap beams of steel tube Bailey beam support brackets, it is planned to seek a large cantilever prestressed cap beam of steel tube Bailey beam support brackets with fast construction speed, simple operation and reliable construction quality. This new form should also be able to avoid the support columns occupying the carriageway of the ground road, thereby effectively solving the traffic problems caused by the support columns. The large cantilever prestressed cap beam of the steel tube Bailey beam support bracket and its construction method are very important. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a large cantilever prestressed cap beam of a steel tube Bailey beam support bracket and a construction method.

[0005] In order to achieve the above technical purpose, the present invention adopts the following technical scheme: a construction method of a large cantilever prestressed cap beam of a steel tube Bailey beam support bracket, comprising the following specific steps:

[0006] Step 1: Construction of foundation and piers: Pile foundation construction, cast-in-place cap on the upper end of the foundation pile, set up pre-buried anchor base and anti-prestress anchor rod during cap construction, and weld and fix the anti-prestress anchor rod to the steel cage of the cap; pier construction is carried out on the upper part of the cap;

[0007] Step 2: Construction of precast concrete floor: The precast concrete floor is precast in a factory, and embedded anchoring bases are set at both ends of the precast concrete floor; the precast concrete floor is transported to the site, and a concrete cushion is constructed below the installation position of the precast concrete floor, and the concrete cushion is used as the foundation of the precast concrete floor; a road surface is constructed between the precast concrete floor and the cap, and the road surface is provided for vehicles to pass;

[0008] Step 3: Installation of steel pipe piles: Install steel pipe piles on the cap and precast concrete base plate; install standardized supports between the steel pipe piles;

[0009] Step 4: Install the top structure of the cap beam support: install a sand box on the top of the steel pipe pile; install a cross beam, Bailey beam, and distribution beam on the upper part of the sand box in sequence; install a bottom template and a side template on the upper part of the distribution beam;

[0010] Step 5: Pre-pressing the bracket;

[0011] Step 6: Cap beam construction: install the cap beam reinforcement cage and prestressed system, then pour concrete, and then perform concrete curing after pouring. After curing, remove the formwork;

[0012] Preferably, the specific method of step five is as follows: a winch and a dynamometer are installed on the traction bracket, the traction bracket is fixedly connected to the anti-prestress anchor rod on the pedestal, and the traction bracket is correspondingly arranged on the outside of the pier column; after the bottom formwork is installed, an anti-prestress frame is placed on it, and a reserved hole is provided on the anti-prestress frame. One end of the steel wire rope passes through the reserved hole and is fixedly connected to the anti-prestress frame, and the other end of the steel wire rope is fixed on the winch, and tensioning is performed synchronously by two winches according to the designed tension.

[0013] Preferably, the embedded anchor base is composed of an embedded sleeve, a threaded fixing rod, a steel plate, and an L-shaped embedded steel bar. The L-shaped embedded steel bar is welded to the lower part of the steel plate, and the L-shaped embedded steel bar is welded and fixed to the base steel cage. The threaded fixing rod and the embedded sleeve are welded to the upper part of the steel plate, and the outer diameter of the embedded sleeve matches the inner diameter of the steel pipe pile. When installing the steel pipe pile, a flange is welded to the bottom of the steel pipe pile, the bottom of the steel pipe pile is sleeved on the embedded sleeve, and the threaded fixing rod is inserted into the bolt through hole on the flange and fixed by a nut.

[0014] Preferably, in step three, the standardized support is welded and processed by H-shaped steel and steel pipe, and a pin hole is set at the end position; two upper and lower U-shaped joints are welded on the steel pipe pile, and a shelf base is welded at the bottom of the lower U-shaped joint; after the steel pipe pile is installed, the standardized support is directly placed at the U-shaped joint position by a crane, the end part of the standardized support is connected to the U-shaped joint, the bottom of the standardized support is supported on the shelf base, and pins are installed in the pin holes to fix the standardized support.

[0015] Preferably, in step four, a construction platform and guardrails are set around the side formwork.

[0016] Preferably, in step four, a mobile safety ladder is placed outside the construction platform.

[0017] Preferably, the counter-preload frame is made of steel sections.

[0018] The large cantilever prestressed cap beam of the steel tube Bailey beam support bracket is constructed by the construction method of the large cantilever prestressed cap beam of the steel tube Bailey beam support bracket.

[0019] The present invention has the following characteristics and beneficial effects:

[0020] 1. The present invention ensures the stability of the support foundation through the installation technology of pre-embedded anchor base of steel pipe piles; utilizes the rapid fixing technology of prefabricated concrete bottom plate of steel pipe piles to improve the construction efficiency and shorten the construction period; the rapid installation technology of standardized support of steel pipe piles simplifies the installation process and reduces the construction difficulty.

[0021] 2. The application of the Bailey beam support formwork system and the cap beam support anti-preloading system of the present invention ensures construction quality and safety, effectively improves construction efficiency and quality, reduces construction costs, and has important practical value.

[0022] 3. The present invention can prevent the support columns from occupying the carriageway of the ground road, thereby effectively solving the traffic problem caused by the support columns. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a horizontal and vertical schematic diagram of the steel tube Bailey beam support bracket large cantilever prestressed cap beam system;

[0024] Figure 2 It is a plan view of the steel tube Bailey beam support bracket large cantilever prestressed cap beam system;

[0025] Figure 3 It is a side elevation diagram of the steel tube Bailey beam support bracket large cantilever prestressed cap beam system;

[0026] Figure 4 It is a schematic diagram of the support anti-preload;

[0027] Figure 5 This is a schematic diagram of the anti-preload frame;

[0028] Figure 6 This is a schematic diagram of sample A;

[0029] Figure 7 It is a schematic diagram of the side elevation of the precast concrete base plate;

[0030] Figure 8 It is a schematic diagram of the plan of the precast concrete base plate;

[0031] Fig. 9 This is a schematic diagram of the construction platform location.

[0032] In the figure: 1-pile foundation, 2-cap, 3-embedded anchor base, 4-anti-prestressed anchor rod, 5-concrete cushion, 6-precast concrete bottom plate, 7-steel pipe pile, 8-pier, 9-sand box, 10-beam, 11-Bailey beam, 12-cap beam, 13-traction bracket, 14-formed support, 15-H-shaped steel, 16-steel pipe, 17-U-shaped joint, 18-pin, 19-shelf bottom plate, 20-distribution beam, 21-guardrail, 22-construction platform, 23-bottom formwork, 24-side formwork, 25-pull rod, 26-winch, 27-wire rope, 28-anti-preload frame, 29-reserved hole, 30-embedded sleeve, 31-threaded fixing rod, 32-steel plate, 33-L-shaped embedded steel bar, 34-mobile safety ladder, 35-flange, 36-access road surface, 37, pin hole. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the embodiments, wherein the traditional construction methods such as site finishing, component processing, component hoisting, drilling, concrete pouring, etc. are not described in detail. The description of the following embodiments is only used to help understand the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0034] Figure 1 It is a horizontal and vertical schematic diagram of the steel tube Bailey beam support bracket large cantilever prestressed cap beam system; Figure 2 It is a plan view of the steel tube Bailey beam support bracket large cantilever prestressed cap beam system; Figure 3 It is a side elevation diagram of the steel tube Bailey beam support bracket large cantilever prestressed cap beam system; Figure 4 It is a schematic diagram of the support anti-preload; Figure 5 This is a schematic diagram of the anti-preload frame; Figure 6 This is a schematic diagram of sample A; Figure 7 It is a schematic diagram of the side elevation of the precast concrete base plate; Figure 8 It is a schematic diagram of the plan of the precast concrete base plate; Fig. 9 This is a schematic diagram of the construction platform location.

[0035] As shown in the figures, the large cantilever prestressed cap beam of the steel pipe Bailey beam maintenance support includes a pile foundation 1, a cap 2, an embedded anchor base 3, an anti-prestressing anchor rod 4, a concrete cushion 5, a precast concrete bottom plate 6, a steel pipe pile 7, a pier 8, a sand box 9, a beam 10, a Bailey beam 11, a cap beam 12, a traction support 13, a standardized support 14, an H-shaped steel 15, a steel pipe 16, a U-shaped joint 17, a pin 18, a shelf bottom plate 19, a distribution beam 20, a guardrail 21, a construction platform 22, a bottom formwork 23, a side formwork 24, a pull rod 25, a winch 26, a steel wire rope 27, an anti-prestressing frame 28, an embedded sleeve 30, a threaded fixing rod 31, a steel plate 32, an L-shaped embedded steel bar 33, a movable safety ladder 34, a flange 35, and a maintenance pavement 36.

[0036] The lower part of the pedestal 2 adopts the pile foundation 1 as the load-bearing foundation, and the upper part of the pedestal 2 is provided with a pier column 8; during the construction of the cast-in-place concrete pedestal 2, a pre-embedded anchor base 3 and a counter-prestressing anchor rod 4 are provided at the upper end thereof, wherein the counter-prestressing anchor rod 4 is welded and fixed to the steel cage of the pedestal 2; the pre-embedded anchor base 3 is composed of an embedded sleeve 30, a threaded fixing rod 31, a steel plate 32, and an L-shaped embedded steel bar 33, wherein the L-shaped embedded steel bar 33 is welded to the lower part of the steel plate 32, and the L-shaped embedded steel bar 33 is welded and fixed to the steel cage of the pedestal 2, and the threaded fixing rod 31 and the embedded sleeve 30 are welded to the upper part of the steel plate 32, and the outer diameter of the embedded sleeve 30 matches the inner diameter of the steel pipe pile 7.

[0037] The precast concrete base plate 6 is precast in the factory, and pre-buried anchor bases 3 are set at both ends of the precast concrete base plate 6; the precast concrete base plate 6 is transported to the site, and the precast concrete base plate 6 is placed on the concrete cushion layer 5, and the concrete cushion layer 5 serves as the foundation for making the concrete base plate 6; the flange 35 is welded at the bottom of the steel pipe pile 7, and the flange 35 is provided with bolt through holes; the bottom of the steel pipe pile 7 is sleeved on the embedded sleeve 30, and the threaded fixing rod 31 is inserted into the bolt through hole on the flange 35 and fixed by a nut; the installation method of the steel pipe pile 7 on the cap 2 and the precast concrete base plate 6 is the same; a standardized support 14 is set between the steel pipe piles 7, wherein the standardized support 14 is welded and processed by H-shaped steel 15 and steel pipe 16, and a pin hole 37 is set at the end position of the standardized support 14; the steel pipe pile 7 is welded with two upper and lower U-shaped joints 17 at the installation position of the standardized support 14, wherein a shelf bottom plate 19 is welded at the bottom of the lower U-shaped joint 17; after the installation of the steel pipe pile 7 is completed, the standardized support 14 is directly placed on the U-shaped joint 17 by a crane, and the bottom of the standardized support 14 is supported on the shelf bottom plate 19, and a pin 18 is installed in the pin hole 37 for fixing; a guaranteed passage 36 is set between the precast concrete bottom plate 6 and the base 2, and the guaranteed passage 36 is for vehicles to pass.

[0038] A sand box 9 is arranged on the top of the steel pipe pile 7; a cross beam 10, a Bailey beam 11 and a distribution beam 20 are sequentially installed on the upper part of the sand box 9; the cross beam 10, the Bailey beam 11, the distribution beam 20 and the steel pipe pile 7 together constitute a steel pipe Bailey beam support; a bottom formwork 23 and a side formwork 24 of a cap beam 12 are installed on the upper part of the distribution beam 20, wherein the bottom formwork 23 and the side formwork 24 are both standardized steel formworks, and a construction platform 22 and a guardrail 21 are arranged around the side formwork 24; the mobile safety ladder 34 is placed on the outside of the construction platform 22 and is moved as needed.

[0039] The traction bracket 13 is made of steel, and a winch 26 and a tension meter are installed on it, wherein the traction bracket 13 is fixed to the anti-prestressing anchor rod 4, and the traction bracket 13 is correspondingly arranged on the outer side of the pier 8; after the installation of the bottom template 23 is completed, an anti-prestressing frame 28 is placed on it, and the anti-prestressing frame 28 is made of steel, and a reserved hole 29 is arranged on it. One end of the steel wire rope 27 passes through the reserved hole 29 and is fixed to the anti-prestressing frame 28, and the other end of the steel wire rope 27 is fixed on the winch 26. According to the designed tension, the two winches 26 are synchronously tensioned and prestressed on the steel pipe Bailey beam support bracket; after the prestressing of the steel pipe Bailey beam support bracket is completed, the cap beam reinforcement cage and the prestressed system are installed.

[0040] The present invention also provides a construction method for a large cantilever prestressed cap beam of a steel tube Bailey beam support bracket, and the specific construction steps are as follows:

[0041] Step 1: Foundation and pier construction:

[0042] During the construction of the pile foundation 1, a cap 2 is cast in situ at the upper end of the foundation pile 1. During the construction of the cap 2, an embedded anchor base 3 and an anti-prestressing anchor rod 4 are arranged, wherein the anti-prestressing anchor rod 4 is welded and fixed to the steel cage of the cap 2; the embedded anchor base 3 is composed of an embedded sleeve 30, a threaded fixing rod 31, a steel plate 32, and an L-shaped embedded steel bar 33. The L-shaped embedded steel bar 33 is welded to the lower part of the steel plate 32, and the L-shaped embedded steel bar 33 is welded and fixed to the steel cage of the cap 2. The threaded fixing rod 31 and the embedded sleeve 30 are welded to the upper part of the steel plate 32, and the outer diameter of the embedded sleeve 30 matches the inner diameter of the steel pipe pile 7; the pier column 8 is constructed on the upper part of the cap 2;

[0043] Step 2: Precast concrete base plate construction:

[0044] The precast concrete floor 6 is precast in a factory, and embedded anchoring bases 3 are arranged at both ends of the precast concrete floor 6; the precast concrete floor 6 is transported to the site, and a concrete cushion layer 5 is constructed below the installation position of the precast concrete floor 6, and the concrete cushion layer 5 is used as the foundation of the precast concrete floor 6; a road surface 36 is constructed between the precast concrete floor 6 and the cap 2, and the road surface 36 is provided for vehicles to pass;

[0045] Step 3: Installation of steel pipe piles:

[0046] The steel pipe piles 7 are installed on the cap 2 and the precast concrete base plate 6; during installation, a flange 35 is welded at the bottom of the steel pipe pile 7, the bottom of the steel pipe pile 7 is sleeved on the embedded sleeve 30, and the threaded fixing rod 31 is inserted into the bolt through hole on the flange 35 and fixed by a nut; a shaped support 14 is installed between the steel pipe piles 7, wherein the shaped support 14 is welded and processed by H-shaped steel 15 and steel pipe 16, and a pin hole 37 is set at the end position; upper and lower U-shaped joints 17 are welded on the steel pipe pile 7, and a shelf base plate 19 is welded at the bottom of the lower U-shaped joint 17; after the installation of the steel pipe pile 7 is completed, the shaped support 14 is directly placed at the position of the U-shaped joint 17 by a crane, the end part of the shaped support 14 is connected to the U-shaped joint 17, the bottom of the shaped support 14 is supported on the shelf base plate 19, and a pin 18 is installed in the corresponding pin hole to fix the shaped support 14;

[0047] Step 4: Install the top structure of the cap beam support:

[0048] A sand box 9 is installed on the top of the steel pipe pile 7; a cross beam 10, a Bailey beam 11, and a distribution beam 20 are installed in sequence on the upper part of the sand box 9; a bottom template 23 and a side template 24 are installed on the upper part of the distribution beam 20, and a construction platform 22 and a guardrail 21 are arranged around the side template 24; a mobile safety ladder 34 is placed outside the construction platform 22, and the mobile safety ladder 34 is moved as needed;

[0049] Step 5: Pre-compression of the bracket:

[0050] The traction bracket 13 is made of steel, a winch 26 and a tension meter are installed on the traction bracket 13, the traction bracket 13 is fixedly connected to the anti-prestressing anchor rod 4 on the cap 2, and the traction bracket 13 is correspondingly arranged on the outside of the pier 8; after the bottom template 23 is installed, an anti-prestressing frame 28 is placed on it, the anti-prestressing frame 28 is made of steel, and a reserved hole 29 is arranged on the anti-prestressing frame 28, one end of the steel wire rope 27 passes through the reserved hole 29 and is fixedly connected to the anti-prestressing frame 28, and the other end of the steel wire rope 27 is fixed on the winch 26, and tensioning is performed synchronously through two winches 26 according to the designed tension;

[0051] Step 6: Cap beam construction:

[0052] After the support prestressing is completed, the cap beam reinforcement cage and prestressing system are installed, and then the concrete is poured. After the pouring is completed, the concrete is cured, and after the curing is completed, the formwork is removed;

[0053] Step 7: Bracket removal and turnover:

[0054] Remove the steel pipe Bailey beam support and repeat the above steps.

[0055] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. The construction method of the large cantilever prestressed cap beam of the steel tube Bailey beam support bracket is characterized in that: The specific steps include: Step 1, foundation and pier construction: Pile foundation (1) is constructed, a cap (2) is cast on the upper end of the foundation pile (1), and a pre-buried anchor base (3) and a counter-prestressing anchor rod (4) are set during the construction of the cap (2), and the counter-prestressing anchor rod (4) is welded and fixed to the steel cage of the cap (2); pier column (8) is constructed on the upper part of the cap (2); Step 2, construction of precast concrete base plate: the precast concrete base plate (6) is precast in a factory, and embedded anchor bases (3) are arranged at both ends of the precast concrete base plate (6); the precast concrete base plate (6) is transported to the site, and a concrete cushion layer (5) is constructed below the installation position of the precast concrete base plate (6), and the concrete cushion layer (5) is used as the foundation of the precast concrete base plate (6); a road surface (36) is constructed between the precast concrete base plate (6) and the pedestal (2), and the road surface (36) is provided for vehicles to pass; Step 3: Installation of steel pipe piles: installing steel pipe piles (7) on the cap (2) and the precast concrete base plate (6); installing shaped supports (14) between the steel pipe piles (7); Step 4: Install the top structure of the cap beam support: install a sand box (9) on the top of the steel pipe pile (7); install a cross beam (10), a Bailey beam (11), and a distribution beam (20) in sequence on the upper part of the sand box (9); install a bottom template (23) and a side template (24) on the upper part of the distribution beam (20); Step 5: Pre-pressing the bracket; Step 6. Cap beam construction: install the cap beam reinforcement cage and prestressed system, then pour the concrete. After pouring, perform concrete curing and remove the formwork after curing.

2. The construction method of the steel tube Bailey beam support large cantilever prestressed cap beam according to claim 1 is characterized in that: The specific method of step five is as follows: a winch (26) and a tension meter are installed on the traction bracket (13), the traction bracket (13) is fixedly connected to the anti-prestressing anchor rod (4) on the pedestal (2), and the traction bracket (13) is correspondingly arranged on the outer side of the pier column (8); after the bottom template (23) is installed, an anti-prestressing frame (28) is placed on it, and a reserved hole (29) is arranged on the anti-prestressing frame (28), one end of the steel wire rope (27) passes through the reserved hole (29) and is fixedly connected to the anti-prestressing frame (28), and the other end of the steel wire rope (27) is fixed on the winch (26), and tensioning is performed synchronously through two winches (26) according to the designed tension.

3. The construction method of the steel tube Bailey beam maintenance support large cantilever prestressed cap beam according to claim 1 is characterized in that: The embedded anchor base (3) is composed of an embedded sleeve (30), a threaded fixing rod (31), a steel plate (32), and an L-shaped embedded steel bar (33). The L-shaped embedded steel bar (33) is welded to the lower part of the steel plate (32), and the L-shaped embedded steel bar (33) is welded and fixed to the steel cage of the cap (2). The threaded fixing rod (31) and the embedded sleeve (30) are welded to the upper part of the steel plate (32), and the outer diameter of the embedded sleeve (30) matches the inner diameter of the steel pipe pile (7). When installing the steel pipe pile (7), a flange (35) is welded to the bottom of the steel pipe pile (7), and the bottom of the steel pipe pile (7) is sleeved on the embedded sleeve (30). The threaded fixing rod (31) is inserted into the bolt through hole on the flange (35) and fixed by a nut.

4. The construction method of the steel tube Bailey beam support large cantilever prestressed cap beam according to claim 1 is characterized in that: In step three, the shaped support (14) is welded by H-shaped steel (15) and steel pipe (16), and a pin hole (37) is set at the end position; two upper and lower U-shaped joints (17) are welded on the steel pipe pile (7), and a shelf base plate (19) is welded at the bottom of the lower U-shaped joint (17); after the steel pipe pile (7) is installed, the shaped support (14) is directly placed at the position of the U-shaped joint (17) by a crane, the end of the shaped support (14) is connected to the U-shaped joint (17), the bottom of the shaped support (14) is supported on the shelf base plate (19), and a pin (18) is installed in the pin hole (37) to fix the shaped support (14).

5. The construction method of the steel tube Bailey beam maintenance support large cantilever prestressed cap beam according to claim 1 is characterized in that: In step 4, a construction platform (22) and guardrails (21) are arranged around the side formwork (24).

6. The construction method of the steel tube Bailey beam support large cantilever prestressed cap beam according to claim 1 is characterized in that: In step 4, a mobile safety ladder (34) is placed outside the construction platform (22).

7. The construction method of the steel tube Bailey beam support large cantilever prestressed cap beam according to claim 1 is characterized in that: The anti-preloading frame (28) is made of section steel.

8. Steel tube Bailey beam support bracket large cantilever prestressed cap beam, characterized in that: The method is constructed by the large cantilever prestressed cap beam construction method of the steel tube Bailey beam support bracket as described in any one of claims 1 to 7.

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