Hydraulic creeping formwork structure capable of synchronously lifting inner formwork and outer formwork and construction method

Abstract

The hydraulic creeping formwork structure comprises a formwork system, a supporting system, a creeping formwork frame, a hydraulic system, an operation platform and a concrete pier body. The template system comprises an outer template, an inner template and a template fastening component; the supporting system comprises a large-surface side supporting bracket and a small-surface side supporting bracket; the hydraulic system comprises a vertical hydraulic jack and an outer template hydraulic regulator; the climbing formwork frame comprises an outer formwork climbing frame and an inner formwork climbing frame. Load of the whole structure is only borne by the six corbels anchored on the pier body, the structure is simple, dismounting and mounting are convenient, adaptability is high, and the method can be applied to construction of hollow thin-wall high piers with uniform cross sections and variable cross sections; a guide rail does not need to be arranged when the structure climbs, the installation time is saved, the climbing efficiency is improved, pier body anchoring components are reduced, and damage to pier body concrete is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, and in particular to a hydraulic climbing formwork structure with synchronous lifting of inner and outer forms and a construction method. Background Art

[0002] With the construction of my country's road network, bridge projects are spreading to areas with complex terrain, and the height of bridge piers is also increasing. Compared with other types of piers, thin-walled high piers have the characteristics of high bearing capacity, low cost, and good seismic performance, and are widely used in high-pier and large-span bridge projects. Among the various construction methods of high piers, the hydraulic climbing formwork method has obvious advantages. When constructing each pier, the climbing formwork structure only needs to be installed once, and then the structure is climbed through the hydraulic system. It has a higher degree of mechanization, so it is widely used. However, the traditional hydraulic climbing formwork structure needs to set up guide rails when climbing, resulting in low climbing efficiency, and too many anchor components cause damage to the pier concrete. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a hydraulic climbing formwork structure with synchronous lifting of inner and outer formworks. The load of the overall structure is borne only by six brackets anchored on the pier body. The structure is simple, disassembly and installation are convenient, and the adaptability is strong. The structure can be applied to the construction of hollow thin-walled high piers with uniform and variable cross-sections. Furthermore, there is no need to set guide rails when the structure climbs, which saves installation time, improves climbing efficiency, reduces pier body anchoring components, and reduces damage to the pier body concrete, which can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a hydraulic climbing formwork structure with synchronous lifting of inner and outer forms, comprising a formwork system, a support system, a climbing formwork frame, a hydraulic system, an operating platform and a concrete pier body; The template system includes an outer template, an inner template and a template fastening member, the outer template and the inner template are connected by the template fastening member, and a channel steel connector connected to the operating platform is provided on the outer side of the outer template; The support system includes a large side support bracket, a small side support bracket and anchor bolts; the large side support bracket and the small side support bracket are anchored on the concrete pier through anchor bolts, and a vertical hydraulic jack and a vertical rod are arranged on the large side support bracket; The operating platform comprises a vertical frame whose bottom contacts the upper part of the small side supporting corbel, and five layers of plane frames are arranged on the vertical frame, and each layer of the plane frames is paved with steel plates; The hydraulic system includes a vertical hydraulic jack arranged on the large-surface side supporting bracket and six outer template hydraulic regulators installed on the operating platform; The climbing formwork frame includes an outer formwork climbing frame and an inner formwork climbing frame. The outer formwork climbing frame is arranged on the large surface side supporting corbel and is connected to the operating platform. The inner formwork climbing frame includes an inner formwork frame connected to the formwork cross ribs of the inner formwork. Adjustable I-beams are provided at the upper and lower ends of the inner formwork frame, and an inner formwork hydraulic regulator is provided in the middle of the inner formwork frame.

[0005] As a preferred technical solution of the present invention, the outer formwork and the inner formwork are both composed of formwork transverse ribs, formwork vertical ribs and formwork panels, and each formwork is provided with five formwork transverse ribs. The channel steel connector is connected to the vertical frame and the plane frame of the operating platform through connectors and connecting pins.

[0006] As a preferred technical solution of the present invention, the template fastening component includes tension screws and anchors. The tension screws are arranged at the position of the template cross ribs and are used to fasten the outer template and the inner template. The corners of the outer template and the corners of the inner template are fixed by anchors.

[0007] As a preferred technical solution of the present invention, the large-surface side supporting corbels and the small-surface side supporting corbels are both triangular structures composed of double-piece channel steels, and steel pads are provided between the large-surface side supporting corbels and the concrete pier body, and between the small-surface side supporting corbels and the concrete pier body.

[0008] As a preferred technical solution of the present invention, four outer template hydraulic regulators are located above the large-surface side supporting corbels, and two outer template hydraulic regulators are located above the small-surface side supporting corbels.

[0009] As a preferred technical solution of the present invention, the external formwork climbing frame includes vertical rods and horizontal beams. The vertical rods are arranged on the large surface side supporting corbels and are connected to the operating platform through connecting pins. The horizontal beams are arranged on the tops of the vertical rods, and adjustment holes are opened on the horizontal beams for adjusting the spacing of variable-section piers.

[0010] As a preferred technical solution of the present invention, the inner formwork climbing frame also includes a hanger rod, which is arranged in the middle of the span of the beam and connects the beam and the inner formwork frame.

[0011] A construction method of a hydraulic climbing formwork structure with synchronous lifting of inner and outer forms, comprising the following steps: S1. After the reinforcement of the first section of the pier body is tied, the outer formwork and operating platform are hoisted, the mold is closed, the anchors and tension screws are installed, and the pier body concrete of the first section is poured; S2, tie the steel bars of the second section, hoist the internal formwork and climbing formwork frame and other structures, install the crossbeam and climbing formwork frame to form a whole, connect the vertical hydraulic jack with the formwork system and climbing formwork frame through connecting pins, and support them on the pedestal; S3. After the concrete strength of the first segment pier reaches 20 MPa, loosen the anchors and tension screws, demould with the horizontal hydraulic jack, and use the hydraulic synchronous lifting control system to control the vertical hydraulic jack to synchronously lift the climbing formwork frame, so that the entire climbing formwork structure climbs to the second segment position. The small side support bracket of the anchored pier is used to bear the load, adjust the template position, and pour concrete after all the anchors and tension screws are installed; S4. After the concrete strength of the second section reaches 20MPa, the tension screws, anchors and small-side support brackets of the formwork are stressed, and the vertical hydraulic jack is reversed to anchor the large-side support brackets of the pier at the tension holes left by the top row of tie rods in the first section to bear the load of the climbing formwork structure; after the reinforcement of the third section is tied, the formwork is removed, and the climbing formwork is lifted again to drive the entire structure to climb to the pre-casting position of the third section for concrete pouring; S5. Then the same method is used to pour the concrete of the subsequent segment pier body until the construction of the entire bridge pier is completed.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The hydraulic climbing formwork structure with synchronous lifting of inner and outer formworks in the example of the present invention has a structure in which the load of the entire structure is borne only by six brackets anchored on the pier body. It has a simple structure, is easy to disassemble and install, has strong adaptability, and can be applied to the construction of hollow thin-walled high piers with uniform and variable cross-sections.

[0013] 2. The hydraulic climbing formwork structure of the present invention can synchronously lift the inner and outer formworks. When the climbing formwork structure is lifted, the inner and outer formworks are lifted synchronously. The inner formwork of the climbing formwork structure is integrated with the outer formwork through structures such as climbing formwork frames, and they are lifted synchronously when they are lifted. The inner formwork does not need other lifting equipment to be lifted.

[0014] 3. The hydraulic climbing formwork structure with synchronous lifting of inner and outer formworks in the example of the present invention does not need to set guide rails when the structure climbs, which saves installation time, improves climbing efficiency, reduces pier body anchoring components, and reduces damage to the pier body concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a cross-sectional schematic diagram of the overall structure of the present invention; Figure 3 It is a plan view schematic diagram of the overall structure of the present invention; Figure 4 It is a structural schematic diagram of a large-surface side supporting corbel in the present invention; Figure 5 It is a schematic structural diagram of the small side supporting corbel in the present invention.

[0016] In the figure: 1 outer formwork, 2 inner formwork, 3 formwork fastening member, 4 formwork transverse rib, 5 formwork vertical rib, 6 formwork panel, 7 tension screw, 8 anchor, 9 connecting pin, 10 channel steel connector, 11 connector, 12 inner formwork climbing frame, 13 inner formwork frame, 14 adjusting I-beam, 15 inner formwork hydraulic regulator, 16 suspension rod, 17 outer formwork climbing frame, 18 vertical rod, 19 cross beam, 20 operating platform, 21 vertical frame, 22 plane frame, 23 steel plate, 24 concrete pier, 25 large side support bracket, 26 small side support bracket, 27 steel pad, 28 anchor bolt, 29 vertical hydraulic jack, 30 outer formwork hydraulic regulator. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-5 The present invention provides a technical solution: a hydraulic climbing formwork structure with synchronous lifting of inner and outer formworks, including a formwork system, a support system, a climbing formwork frame, a hydraulic system, an operating platform and a concrete pier body 24.

[0019] The formwork system includes an outer formwork 1, an inner formwork 2 and a formwork fastening component 3. The outer formwork 1 and the inner formwork 2 are connected by the formwork fastening component 3, and a channel steel connector 10 connected to an operating platform 20 is provided on the outer side of the outer formwork 1. The outer formwork 1 and the inner formwork 2 are both composed of formwork cross ribs 4, formwork vertical ribs 5 and formwork panels 6, and each formwork has five formwork cross ribs 4; the formwork fastening component 3 includes tensioning screws 7 and anchors 8. The tensioning screws 7 are arranged at the position of the formwork cross ribs 4, and are used to fasten the outer formwork 1 and the inner formwork 2 to prevent dislocation; the corners of the outer formwork 1 and the corners of the inner formwork 2 are fixed by anchors 8, and the anchors 8 are used to connect the formworks on each side of the inner formwork 2 and the outer formwork 1.

[0020] The support system includes a large side support corbel 25, a small side support corbel 26 and anchor bolts 28; the large side support corbel 25 and the small side support corbel 26 are anchored on the concrete pier body 24 by anchor bolts 28, and a vertical hydraulic jack 29 and a vertical rod 18 are arranged on the large side support corbel 25.

[0021] The operating platform 20 includes a vertical frame 21 whose bottom contacts the upper part of the small side supporting corbel 26. Five layers of planar frames 22 are arranged on the vertical frame 21, and each layer of the planar frames 22 is paved with steel plates 23. The channel steel connector 10 is connected to the vertical frame 21 and the planar frame 22 of the operating platform 20 through the connector 11 and the connecting pin 9.

[0022] The vertical frame 21 uses 12# and 14# "][" type channel steel, the plane frame 22 uses square tubes and 10# channel steel, and the steel plate 23 has a thickness of 5mm.

[0023] The hydraulic system includes four vertical hydraulic jacks 29 arranged on the large-surface side supporting brackets 25 for lifting the climbing formwork structure; and six external formwork hydraulic regulators 30 installed on the operating platform 20.

[0024] The climbing formwork frame includes an outer formwork climbing frame 17 and an inner formwork climbing frame 12. The outer formwork climbing frame 17 is arranged on the large surface side supporting corbel 25 and is connected to the operating platform 20. The inner formwork climbing frame 12 includes an inner formwork frame 13 connected to the formwork cross ribs 4 of the inner formwork 2. Adjustment I-beams 14 are provided at the upper and lower ends of the inner formwork frame 13, and an inner formwork hydraulic regulator 15 is provided in the middle of the inner formwork frame 13.

[0025] Furthermore, both the large-surface side supporting corbel 25 and the small-surface side supporting corbel 26 are triangular structures composed of double-piece channel steels, and steel pads 27 are provided between the large-surface side supporting corbel 25 and the concrete pier body 24, and between the small-surface side supporting corbel 26 and the concrete pier body 24, to strengthen the connection and avoid stress concentration.

[0026] Furthermore, four external formwork hydraulic regulators 30 are located above the large surface side supporting corbels 25 and are arranged at the second-layer climbing formwork position of the operating platform 20, and two external formwork hydraulic regulators 30 are located above the small surface side supporting corbels 26 and are arranged at the middle position of the second layer of the operating platform 20.

[0027] Furthermore, the external formwork climbing frame 17 includes a vertical rod 18 and a horizontal beam 19. The vertical rod 18 is arranged on the large surface side supporting corbel 25, adopts 22# "[]" type channel steel, and is connected to the operating platform 20 through a connecting pin 9. The horizontal beam 19 is arranged on the top of the vertical rod 18, adopts HN400×200 type I-steel, and an adjustment hole is opened on the horizontal beam 19 for adjusting the spacing of the variable-section piers.

[0028] Furthermore, the inner formwork climbing frame 12 also includes a hanger 16, which is arranged in the middle of the span of the beam 19 and connects the beam 19 and the inner formwork frame 13. The inner formwork frame 13 is made of double-jointed channel steel.

[0029] A construction method of a hydraulic climbing formwork structure with synchronous lifting of inner and outer forms, comprising the following steps: S1. After the reinforcement of the first section of the pier body is tied, the outer formwork 1 and the operating platform 20 are hoisted, the mold is closed and the anchors 8 and the tension screws 7 are installed, and the pier body concrete of the first section is poured; S2, tying the steel bars of the second section, hoisting the inner formwork 2 and the climbing formwork frame and other structures, installing the crossbeam 19 and the climbing formwork frame to form a whole, connecting the vertical hydraulic jack 29 with the formwork system and the climbing formwork frame through the connecting pin 9 as a whole, and supporting it on the cap; S3, after the concrete strength of the first section pier reaches 20MPa, loosen the anchors 8 and the tension screws 7, demould by means of the horizontal hydraulic jack, use the hydraulic synchronous lifting control system to control the vertical hydraulic jack 29 to synchronously lift the climbing formwork frame, so that the entire climbing formwork structure climbs to the position of the second section, anchor the small side support bracket 26 of the pier to bear the load, adjust the position of the formwork, install all the anchors 8 and the tension screws 7, and then pour the concrete; S4. After the concrete strength of the second section reaches 20MPa, the tension screws 7, the anchors 8 and the small side support brackets 26 of the formwork are stressed, and the vertical hydraulic jacks 29 are reversed to anchor the large side support brackets 25 of the pier at the tension holes left by the uppermost row of tie rods in the first section, bearing the load of the climbing formwork structure; after the reinforcement of the third section is tied, the formwork is removed, and the climbing formwork is lifted again to drive the entire structure to climb to the pre-casting position of the third section for concrete pouring; S5. Then the same method is used to pour the concrete of the subsequent segment pier body until the construction of the entire bridge pier is completed.

[0030] In addition, it should be noted that the connector 11, the cross beam 19, the adjusting I-beam 14 and other components have adjustment holes, and the spacing can be adjusted by means of the position of the connecting pins or bolts, which is used for the construction of variable-section hollow thin-walled high piers.

[0031] In order to adapt to the variable cross-section, the square tube close to the pier body on the operating platform 20 located on the large side of the pier is cut off.

[0032] After the construction of the second section is completed, a suspension platform is set under the operating platform 20 to support the removal and fixing of the bracket anchor bolts and to maintain and repair the poured concrete section.

[0033] The beneficial effects of the present invention are specifically as follows: the load of the overall structure is borne only by six brackets anchored on the pier body, the structure is simple, disassembly and installation is convenient, and the adaptability is strong, and the invention can be applied to the construction of hollow thin-walled high piers with uniform and variable cross-sections; the inner and outer formworks are lifted synchronously when the climbing formwork structure climbs; the inner formwork of the climbing formwork structure is integrated with the outer formwork through structures such as a climbing formwork frame, and they are lifted synchronously when climbing, and the inner formwork does not require other lifting equipment for lifting; there is no need to set a guide rail when the structure climbs, which saves installation time, improves climbing efficiency, reduces the anchoring components of the pier body, and reduces damage to the pier body concrete.

[0034] The undisclosed parts in the present invention are all prior art, and their specific structures, materials and working principles are not described in detail. Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A hydraulic climbing formwork structure with synchronous lifting of inner and outer forms, comprising a formwork system, a support system, a climbing formwork frame, a hydraulic system, an operating platform and a concrete pier body (24), characterized in that: The formwork system comprises an outer formwork (1), an inner formwork (2) and a formwork fastening member (3); the outer formwork (1) and the inner formwork (2) are connected via the formwork fastening member (3), and a channel steel connector (10) connected to an operating platform (20) is provided on the outer side of the outer formwork (1); The support system comprises a large-surface side support bracket (25), a small-surface side support bracket (26) and anchor bolts (28); the large-surface side support bracket (25) and the small-surface side support bracket (26) are anchored on the concrete pier body (24) via the anchor bolts (28), and a vertical hydraulic jack (29) and a vertical rod (18) are arranged on the large-surface side support bracket (25); The operating platform (20) comprises a vertical frame (21) whose bottom contacts the upper part of the small side supporting bracket (26); five layers of planar frames (22) are arranged on the vertical frame (21), and each layer of the planar frames (22) is paved with a steel plate (23); The hydraulic system comprises a vertical hydraulic jack (29) arranged on the large-surface side supporting bracket (25) and six external formwork hydraulic regulators (30) installed on the operating platform (20); The climbing formwork frame comprises an outer formwork climbing frame (17) and an inner formwork climbing frame (12); the outer formwork climbing frame (17) is arranged on a large-surface side supporting bracket (25) and is connected to an operating platform (20); the inner formwork climbing frame (12) comprises an inner formwork frame (13) connected to a formwork cross rib (4) of an inner formwork (2); upper and lower ends of the inner formwork frame (13) are provided with adjusting I-beams (14); and an inner formwork hydraulic regulator (15) is provided in the middle of the inner formwork frame (13).

2. The template according to claim 1, characterized in that: The outer formwork (1) and the inner formwork (2) are both composed of formwork transverse ribs (4), formwork vertical ribs (5) and formwork panels (6), and each formwork is provided with a total of five formwork transverse ribs (4). The channel steel connector (10) is connected to the vertical frame (21) and the plane frame (22) of the operating platform (20) via a connector (11) and a connecting pin (9).

3. The template according to claim 2, characterized in that: The template fastening component (3) comprises a tension screw (7) and an anchor (8); the tension screw (7) is arranged at the position of the template transverse rib (4) and is used to fasten the outer template (1) and the inner template (2); the corners of the outer template (1) and the corners of the inner template (2) are both fixed by the anchor (8).

4. The template according to claim 1, characterized in that: The large-surface side supporting bracket (25) and the small-surface side supporting bracket (26) are both triangular structures composed of double-jointed channel steels, and steel pads (27) are provided between the large-surface side supporting bracket (25) and the concrete pier body (24), and between the small-surface side supporting bracket (26) and the concrete pier body (24).

5. The template according to claim 1, characterized in that: Four outer template hydraulic regulators (30) are located above the large-surface side supporting brackets (25), and two outer template hydraulic regulators (30) are located above the small-surface side supporting brackets (26).

6. The template according to claim 1, characterized in that: The outer formwork climbing frame (17) comprises a vertical rod (18) and a horizontal beam (19); the vertical rod (18) is arranged on the large surface side supporting bracket (25) and is connected to the operating platform (20) via a connecting pin (9); the horizontal beam (19) is arranged on the top of the vertical rod (18), and an adjustment hole for adjusting the spacing of the variable cross-section bridge piers is opened on the horizontal beam (19).

7. The template according to claim 6, characterized in that: The inner formwork climbing frame (12) further comprises a suspension rod (16), wherein the suspension rod (16) is arranged in the middle of the crossbeam (19) and connects the crossbeam (19) and the inner formwork frame (13).

8. A construction method based on the hydraulic climbing formwork structure with synchronous lifting of inner and outer formworks according to claim 1, characterized in that: The following steps are involved: S1. After the reinforcement of the first section of the pier body is tied, the outer formwork (1) and the operating platform (20) are hoisted, the mold is closed and the anchors (8) and the tension screws (7) are installed, and the concrete of the first section of the pier body is poured; S2, tying the steel bars of the second section, hoisting the inner formwork (2) and the climbing formwork frame and other structures, installing the crossbeam (19) and the climbing formwork frame to form a whole, connecting the vertical hydraulic jack (29) with the formwork system and the climbing formwork frame through the connecting pin (9) to form a whole, and supporting it on the cap; S3, after the concrete strength of the first segment pier reaches 20 MPa, loosen the anchors (8) and the tension screws (7), demould by means of a horizontal hydraulic jack, and use a hydraulic synchronous lifting control system to control the vertical hydraulic jacks (29) to synchronously lift the climbing formwork frame, so that the entire climbing formwork structure climbs to the position of the second segment, anchor the small side support bracket (26) of the pier to bear the load, adjust the position of the formwork, install all the anchors (8) and the tension screws (7), and then pour the concrete; S4, after the concrete strength of the second section reaches 20 MPa, the tension screws (7), the anchors (8) and the small side support brackets (26) of the formwork are stressed, and the vertical hydraulic jack (29) is reversed to anchor the large side support brackets (25) of the pier at the tension hole positions left by the uppermost row of tie rods in the first section, so as to bear the load of the climbing formwork structure; after the reinforcement of the third section is tied, the formwork is removed, and the climbing formwork is lifted again, driving the entire structure to climb to the pre-cast position of the third section for concrete pouring; S5. Then the same method is used to pour the concrete of the subsequent segment pier body until the construction of the entire bridge pier is completed.

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