A bottomless steel casing template integral lowering device and construction method

Abstract

The present invention provides an overall lowering device and construction method for a bottomless steel casing template, the device comprises a steel pipe pile embedded in a pile head for supporting, a steel ring beam placed inside the steel pipe pile, a steel bracket placed outside the steel pipe pile for temporarily supporting the casing, a work platform placed on the top of the steel pipe pile, a lowering system placed on the work platform, and a plurality of casing hanging points placed inside the casing, wherein the casing hanging points are arranged below the work platform, the lowering system comprises an upper pad beam, a lower pad beam, a suspension steel bar, a nut gasket, and a jack, wherein the upper end of the upper pad beam is connected to the nut gasket for anchoring, and the lower end is connected to the jack, the upper end of the lower pad beam is connected to the jack, and the lower end is connected to the work platform, and the suspension steel bar passes through the nut gasket, the upper pad beam, the jack, the lower pad beam, the work platform, and the casing hanging point. The present invention solves the problems of the traditional bottomless casing hoisting operation being complicated, difficult to operate, and poor integrity, and at the same time improves the construction efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of steel casing formwork lowering construction, and in particular relates to an overall lowering device for a bottomless steel casing formwork and a construction method. Background Art

[0002] With the remarkable development of construction technology in my country's transportation construction, the number of large-scale water-based construction projects for bridge engineering has gradually increased. In bridge engineering, large steel casings are often used for the construction of water-based pedestal projects. Conventional steel casings can be lowered by large floating cranes, continuous jack lowering, and multi-point lowering of steel casings as a whole. However, due to various reasons such as cost, the multi-point lowering process of steel casings as a whole is usually adopted. How to ensure the continuity of the lowering of the steel casing during the lowering process has become a technical difficulty in the construction of steel casings. The traditional lowering construction of steel casing templates has the problems of complex and difficult hoisting operations, poor integrity, and low operating efficiency. Summary of the invention

[0003] The present invention provides an overall lowering device and construction method for a bottomless steel box formwork, so as to solve the defects of the steel box formwork lowering construction in the current market, such as complex hoisting operation and difficulty in operation, poor integrity, and low operation efficiency, etc., as mentioned in the above background technology.

[0004] The technical solution of the present invention is: a bottomless steel casing template overall lowering device, including a steel pipe pile embedded in the pile head for support, a steel ring beam placed on the inner side of the steel pipe pile, a steel corbel for temporarily supporting the casing placed on the outer side of the steel pipe pile, a working platform placed on the top of the steel pipe pile, a lowering system placed on the working platform, and a plurality of casing hanging points placed on the inner side of the casing, wherein the casing hanging points are arranged below the working platform, the lowering system includes an upper pad beam, a lower pad beam, suspension steel bars, a nut gasket, and a jack, wherein the upper end of the upper pad beam is connected to the nut gasket for anchoring, and the lower end is connected to the jack, the upper end of the lower pad beam is connected to the jack, and the lower end is connected to the working platform, the suspension steel bars pass through the nut gasket, the upper pad beam, the jack, the lower pad beam, the working platform and the casing hanging point, and the bottom of the suspension steel bars is fixed to the casing hanging point by nuts.

[0005] According to a further solution, a ring beam corbel is provided on the inner side of the steel pipe pile, and the steel ring beam is placed on the ring beam corbel.

[0006] According to a further solution, the steel ring beam is arranged in two layers along the height direction, the steel ring beam on the bottom layer is flush with the bottom of the steel corbel, and the steel ring beam on the top layer is flush with the top of the steel corbel.

[0007] According to a further solution, the working platform is composed of steel sections arranged along the short side direction of the casing, and connecting steel sections are provided above the working platform. The connecting steel sections are perpendicular to the working platform, connecting the working platform into a whole, thereby improving the safety of the working platform.

[0008] According to a further solution, the number of the jacks is 6, which are respectively arranged at both ends of the working platform and close to the two long sides of the casing.

[0009] On the other hand, the present invention provides a construction method for a bottomless steel casing template integral lowering device, the steps of which include:

[0010] (1) A working platform is set up on the top of the steel pipe pile using steel sections. A connecting steel section is set above the working platform. The connecting steel section is perpendicular to the working platform. A steel section corbel is set on the outside of the steel pipe pile. Two layers of steel ring beams are set on the inside of the steel pipe pile corresponding to the position of the steel corbel. A ring beam corbel is set at the connection between the steel ring beam and the steel pipe pile. A casing hanging point is set on the inside of the casing, which can also serve as a corbel to support the purlin.

[0011] (2) Install the lowering system as required, fix the suspension steel bars to the casing lifting points, and temporarily support the casing through the steel brackets;

[0012] (3) Raise the jack of the lowering system by 20 cm simultaneously, then cut off the steel bracket, and then lower the jack synchronously, 20 cm each time, in sequence until the entire casing is lowered into place;

[0013] (4) After the casing is lowered into place, the upper purlins are hoisted in sections. After all the casing purlins are in place, the lowering system is removed.

[0014] The advantages of the present invention are as follows: the present invention makes the jacks on the same horizontal plane through the working platform and the adjustment of the upper cushion beam and the lower cushion beam, the suspended steel bars and the casing lifting points are connected and fixed, and after the overall assembly is completed, a through-hole jack is used to lower the 6 as a whole, which has strong operability and is applicable to all bottomless casing formwork construction, solves the problems of complex and difficult operation and poor integrity of traditional bottomless casing lifting operations, and improves construction efficiency at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a longitudinal elevation view of a bottomless steel casing template integral lowering device and a construction method of the present invention;

[0016] Figure 2 It is a horizontal elevation view of a bottomless steel casing template integral lowering device and a construction method of the present invention;

[0017] Figure 3 The invention discloses a bottomless steel casing template integral lowering device and a construction method. Figure 1 II cross-sectional view;

[0018] Figure 4 The invention discloses a bottomless steel casing template integral lowering device and a construction method. Figure 1 II-II cross-sectional view;

[0019] Among them: 1. Steel pipe piles, 2. Ring beam corbels, 3. Steel ring beams, 4. Steel corbels, 5. Working platform, 6. Connecting steel, 7. Upper pad beams, 8. Jacks, 9. Lower pad beams, 10. Box lifting points, 11. Suspended steel bars, 12. Boxes. DETAILED DESCRIPTION

[0020] The present invention is described clearly and completely below in conjunction with the accompanying drawings so that those skilled in the art can fully implement the present invention without having to make any creative work.

[0021] The specific implementation mode of the present invention is: Figure 1-4 As shown, a bottomless steel casing template integral lowering device comprises a steel pipe pile 1 embedded in the pile head for supporting, a steel ring beam 3 placed inside the steel pipe pile 1, a steel bracket 4 placed outside the steel pipe pile 1 for temporarily supporting a casing 12, a working platform 5 placed on the top of the steel pipe pile 1, a lowering system placed on the working platform 5, and a plurality of casing hanging points 10 placed inside the casing 12, wherein the casing hanging points 10 are arranged below the working platform 5, and the lowering system comprises an upper cushion beam 7, a lower cushion beam 8, and a lower cushion beam 9. Beam 9, suspension steel bars 11, nut washers, and jack 8. The upper end of the upper pad beam 7 is connected to the nut washers for anchoring, and the lower end is connected to the jack 8. The upper end of the lower pad beam 9 is connected to the jack 8, and the lower end is connected to the working platform 5. The suspension steel bars 11 pass through the nut washers, the upper pad beam 7, the jack 8, the lower pad beam 9, the working platform 5 and are connected to the casing hanging point 10. The bottom of the suspension steel bars 11 is fixed to the casing hanging point 10 by nuts, and the jack 8 is a through-type jack.

[0022] In the present invention, a ring beam corbel 2 is further provided on the inner side of the steel pipe pile 1, and the profiled steel ring beam 3 is placed on the ring beam corbel 2 to improve stability.

[0023] The present invention further provides two layers of the steel ring beam 3 along the height direction, the steel ring beam 3 at the bottom layer is flush with the bottom of the steel corbel 4 , and the steel ring beam 3 at the top layer is flush with the top of the steel corbel 4 .

[0024] The present invention further comprises that the working platform 5 is composed of steel sections arranged along the short side direction of the casing 12 , and a connecting steel section 6 is provided above the working platform 5 , and the connecting steel section 6 is perpendicular to the working platform 5 , connecting the working platform 5 into a whole, thereby improving the safety of the working platform 5 .

[0025] In the present invention, the number of the jacks 8 is six, which are respectively arranged at two ends of the working platform 5 and close to the two long sides of the casing 12 .

[0026] On the other hand, the present invention provides a construction method for a bottomless steel casing template integral lowering device, the steps of which include:

[0027] (1) A working platform 5 is set on the top of the steel pipe pile 1 using steel sections. A connecting steel section 6 is set above the working platform 5. The connecting steel section 6 is perpendicular to the working platform 5. A steel section corbel 4 is set on the outside of the steel pipe pile 1. A two-layer steel ring beam 3 is set on the inside of the steel pipe pile 1 corresponding to the position of the steel corbel 4. A ring beam corbel 2 is set at the connection between the steel ring beam 3 and the steel pipe pile 1. A casing hanging point 10 is set on the inside of the casing 12, which can also serve as a purlin support corbel;

[0028] (2) Install the lowering system as required, fix the suspension steel bar 11 to the casing hanging point 10, and temporarily support the casing 12 through the steel bracket 4;

[0029] (3) The jack 8 of the lowering system is synchronously raised by 20 cm, and then the steel bracket 4 is cut off, and then the jack 8 is synchronously lowered, 20 cm each time, and the cycle is repeated until the casing 12 is lowered into place as a whole;

[0030] (4) After the casing 12 is lowered into place, the upper purlins are hoisted in sections. After all the casing purlins are in place, the lowering system is removed.

[0031] The overall structure of the present invention is simple in stress bearing, the steel pipe pile 1 is made of 630 steel pipe, and its overall structure is stable. In the present invention, the jack 8 is placed on the same horizontal plane through the working platform 5 and the adjustment of the upper cushion beam 7 and the lower cushion beam 9, the hanging steel bar 11 and the casing lifting point 10 are connected and fixed, and after the overall assembly is completed, the through-core jack 1 is used to support the overall lowering 6, which has strong operability and is applicable to all bottomless casing template construction, solving the problems of complex and difficult operation of traditional bottomless casing lifting operations and poor integrity, while improving construction efficiency.

[0032] The preferred embodiments of the present invention are described above. It should be pointed out that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any simple modifications, equivalent changes and modifications made to the above embodiments by any technician familiar with the art based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A construction method for an overall lowering device for a bottomless steel casing formwork, the construction method is implemented based on the lowering device, and is characterized in that: The lowering device includes a steel pipe pile embedded in the pile head for support, a steel ring beam placed inside the steel pipe pile, a steel bracket of a temporary support casing placed outside the steel pipe pile, a working platform placed on the top of the steel pipe pile, a lowering system placed on the working platform, and a plurality of casing lifting points placed inside the casing. The casing lifting points are arranged below the working platform. The lowering system includes an upper pad beam, a lower pad beam, suspension steel bars, a nut gasket, and a jack. The upper end of the upper pad beam is connected to the nut gasket for anchoring, and the lower end is connected to the jack. The upper end of the lower pad beam is connected to the jack, and the lower end is connected to the working platform. The suspension steel bars pass through the nut gasket, the upper pad beam, the jack, and the lower pad beam. , the working platform is connected to the casing lifting point, and the bottom of the suspended steel bar is fixed to the casing lifting point by nuts; a ring beam corbel is provided on the inner side of the steel pipe pile, and the steel ring beam is placed on the ring beam corbel; the steel ring beam is arranged in two layers in the height direction, the steel ring beam on the bottom layer is flush with the bottom of the steel corbel, and the steel ring beam on the top layer is flush with the top of the steel corbel; the working platform is composed of steel sections arranged along the short side direction of the casing, and a connecting steel section is arranged above the working platform, and the connecting steel section is perpendicular to the working platform, connecting the working platform into a whole, thereby improving the safety of the working platform; the number of the jacks is 6, which are respectively arranged at both ends of the working platform and close to the two long sides of the casing; The steps of the construction method include: (1) A working platform is set up on the top of the steel pipe pile using steel sections. A connecting steel section is set above the working platform. The connecting steel section is perpendicular to the working platform. A steel section corbel is set on the outside of the steel pipe pile. Two layers of steel ring beams are set on the inside of the steel pipe pile corresponding to the position of the steel corbel. A ring beam corbel is set at the connection between the steel ring beam and the steel pipe pile. A casing hanging point is set on the inside of the casing, which can also serve as a corbel to support the purlin. (2) Install the lowering system as required, fix the suspension steel bars to the casing lifting points, and temporarily support the casing through the steel brackets; (3) Raise the jack of the lowering system by 20 cm simultaneously, then cut off the steel bracket, and then lower the jack synchronously, 20 cm each time, in sequence until the entire casing is lowered into place; (4) After the casing is lowered into place, the upper purlins are hoisted in sections. After all the casing purlins are in place, the lowering system is removed.

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