Cantilever formwork of variable-diameter pier column of foundation pit

Abstract

The cantilever formwork of the variable-diameter pier column of the foundation pit comprises a cantilever platform, a plurality of main formworks are connected end to end in the circumferential direction on the cantilever platform with the pier column as the reference, and the area defined by the main formworks is a pouring area of the pier column; the main formwork is connected to the cantilever platform in a radial dip angle adjusting mode with the pier column as the reference, one end of the main formwork is provided with a horizontally-telescopic extension part, and the other end of the main formwork is provided with a horizontally-telescopic and rotationally-connected abutting and supporting part. The free end of the abutting and supporting part rotates and translates to be attached to the face plate, facing the pier column, of the extending part of the next-stage main formwork. According to the cantilever formwork, the variable-diameter slope angle is controlled through the radial positioning dip angle of the main formwork, the horizontally-telescopic extension parts at the two ends of the main formwork are matched with the horizontally-telescopic and rotationally-supported abutting and supporting parts, so that end-to-end abutting and supporting connection of the multiple main formworks is achieved, and the problems that the lower portion of a corner gap of a variable-diameter pier column is small, the upper portion of the corner gap is large, and plugging is difficult are solved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete casting formwork, in particular to a cantilever formwork for a foundation pit variable diameter pier column. Background Art

[0002] For a long time, cantilever formwork has been mostly used for pier casting construction. Its working principle is: the bottom of the pier formwork is fixed on the cantilever platform, and the cantilever platform is fixed on the ground or on the outer wall of the next pier that has been cast and has sufficient stress to support the overall cantilever formwork, so as to achieve step-by-step casting of the pier from top to bottom.

[0003] However, when pouring variable diameter piers, it is often necessary to reset the template according to the variable diameter slope of the pier, and re-install the template with an angle on the cantilever platform and seal it. This construction method not only requires a separate template for a single pier size, but also requires frequent hoisting, splicing, and disassembly work on the high-altitude pier, which takes a long time and is costly. After a single pier is poured, it cannot be used to pour piers with different variable diameter slopes due to the limit of the inclination angle of the two templates at the front and rear edges.

[0004] Therefore, how to design a cantilever formwork for variable-diameter piers in foundation pits so that the cantilever formwork has a certain deformation space, can be adjusted within a certain inclination range to adapt to the casting construction of variable-diameter piers with different slopes, and can be reused without the need to repeatedly disassemble and position the formwork at a high position on the top of the pier, has become a technical problem that needs to be urgently solved by people in this field. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to provide a cantilever formwork for a variable diameter pier column of a foundation pit, wherein the cantilever formwork controls the variable diameter slope angle by the radial positioning inclination angle of the main formwork, and the horizontally telescopic extension parts at both ends of the main formwork cooperate with the horizontally telescopic and rotatably supported supporting parts to achieve the head and tail supporting connection between multiple main formworks, thereby solving the problem that the gap at the corner of the variable diameter pier column is small at the bottom and large at the top and difficult to block.

[0006] In order to solve the above problems, the present invention provides a cantilever formwork for a variable diameter pier column of a foundation pit, comprising a cantilever platform, on which a plurality of main formworks are connected end to end in a circumferential direction with the pier column as a reference, and the area surrounded by the plurality of main formworks is a casting area for the pier column;

[0007] The main formwork is connected to the cantilever platform by adjusting the radial inclination with the pier as a reference. One end of the main formwork is provided with a horizontally telescopic extension part, and the other end of the main formwork is provided with a horizontally telescopic and rotatably connected support part; the free end of the support part rotates and translates to fit on the panel of the next-level main formwork extension part facing the pier.

[0008] Preferably, a main shaft seat is fixedly provided on the cantilever platform, and a main hydraulic cylinder is hingedly supported on the cantilever platform located on both sides of the main shaft seat; a main connecting ear connected to the main shaft seat pin shaft is fixedly provided on the lower part of the main template; and the power output end of the main hydraulic cylinder is hingedly supported on the upper part of the main template.

[0009] Preferably, the extension part includes an extension template and an extension hydraulic cylinder; the top and bottom of the extension template are respectively slidably guided and buckled on the top and bottom surfaces of the main template, one side of the extension template slides horizontally out of the main template, and the upper and lower parts of the back side of the extension template are horizontally supported by extension hydraulic cylinders; the extension hydraulic cylinder is fixed on the main template in a horizontal posture, and the power output end of the extension hydraulic cylinder is fixedly connected to and laterally supports the extension template.

[0010] Preferably, hook plates are fixedly provided on the top and bottom of the extension formwork, and the middle part of the extension formwork is made into a thin-walled plate that slides and fits on the casting surface of the main formwork; the hook plates are respectively slidably fastened on the top and bottom surfaces of the main formwork, and the hook plates provide sliding guide support with anti-deformation strength for the thin-walled plate in the middle part of the extension formwork, and the hook plates are fixedly supported on the power output end of the extension hydraulic cylinder.

[0011] Preferably, the supporting part includes a supporting plate, a hydraulic hinge rod and a push hydraulic cylinder, wherein one end of the supporting plate is a thin-walled plate that slides horizontally and rotates to fit on the casting surface of the main formwork, and the other end of the supporting plate horizontally protrudes out of the main formwork; the hydraulic hinge rod is hingedly connected to the upper part of one end of the main formwork, and the power output end of the hydraulic hinge rod is hingedly supported to the upper part of the supporting plate; the push hydraulic cylinder is fixedly arranged at the lower part of one end of the main formwork, and the power output end of the push hydraulic cylinder rotates and supports the lower part of the supporting plate through a universal ball.

[0012] Preferably, the hydraulic hinge rod includes a first hydraulic cylinder and a second hydraulic cylinder, one end of the first hydraulic cylinder and the second hydraulic cylinder are hingedly connected to the upper back side of one end of the main template through a hinge seat, wherein the power output end of the first hydraulic cylinder is hingedly connected to the upper back side of the support plate through a hinge seat, and the power output end of the second hydraulic cylinder is hingedly supported to the middle part of the cylinder body of the first hydraulic cylinder.

[0013] Preferably,

[0014] A hydraulic cylinder and a guide support block are fixedly arranged at the lower part of one end of the main template; the piston rod of the hydraulic cylinder slides through the guide support block, and a universal ball seat is fixedly arranged at the end of the piston rod of the hydraulic cylinder;

[0015] A universal ball head is fixedly arranged at the bottom of the back of the support plate in a horizontal posture, one end of the universal ball head is fixedly connected through a mounting seat fixed on the back of the support plate, and the other end of the universal ball head is rotatably inserted in the universal ball seat.

[0016] The advantages of the present invention compared with the prior art are:

[0017] A cantilever formwork for a variable diameter pier column of a foundation pit of the present invention first casts the variable diameter section of the variable diameter pier column through a main formwork supported by an inclination adjustment on a cantilever platform, and adjusts the extension amount of the main hydraulic cylinder according to the variable diameter slope angle of the variable diameter section, so that the main formwork is rotated to adjust the inclination angle of the main formwork with the pin shaft connection position of the main shaft seat and the main connecting ear as the axis; then, an extension part that can slide and retract horizontally and a supporting part that can slide horizontally and rotate are respectively arranged at both ends of the main formwork, and when working, the side wall of the supporting part of the upper-level main formwork always supports the casting surface of the extension part of the lower-level main formwork, and as the inclination angle of the main formwork is adjusted, the translation amount of the extension part, as well as the translation amount and rotation angle of the supporting part are controlled to ensure the leak-proof sealing abutment between the upper-level main formwork and the lower-level main formwork at the variable diameter joint. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 1 It is a schematic diagram of the construction posture of the cantilever formwork in the present invention;

[0020] Figure 2 It is a schematic diagram of the non-diameter-variable posture of the back side of the main template in the present invention (the vertical section of the cast pier column);

[0021] Figure 3 for Figure 2 Schematic diagram of the circumferential end-to-end connection distribution of the main formwork when pouring the vertical section of the middle pier column;

[0022] Figure 4 It is a schematic diagram of the variable diameter posture of the back of the main template in the present invention (the variable diameter section for casting the pier column);

[0023] Figure 5 for Figure 4 Schematic diagram of the circumferential end-to-end connection distribution of the main formwork when pouring the variable diameter section of the middle pier column;

[0024] Figure 6 It is a schematic diagram of the structure of the variable diameter pier column after the cantilever formwork is cast in the present invention;

[0025] In the figure: 1-cantilever platform; 2-extension formwork; 3-extension hydraulic cylinder; 4-main hydraulic cylinder; 5-main formwork; 6-main shaft seat; 7-main connecting ear; 8-hydraulic hinge rod; 9-push hydraulic cylinder; 10-support plate; 11-vertical section of pier column; 12-hook plate; 13-second hydraulic cylinder; 14-first hydraulic cylinder; 15-mounting seat; 16-universal ball head; 17-universal ball seat; 18-guide support block; 19-curved caulking plate; 20-pier column reducing section. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0029] Combination Figure 1 to Figure 6 The cantilever formwork of a foundation pit variable diameter pier of the present invention comprises a cantilever platform 1, on which a plurality of main formworks 5 are connected end to end in a circumferential direction with the pier as a reference, and the area surrounded by the plurality of main formworks is a casting area of ​​the pier;

[0030] The main formwork is connected to the cantilever platform by adjusting the radial inclination with the pier as a reference. One end of the main formwork is provided with a horizontally telescopic extension part, and the other end of the main formwork is provided with a horizontally telescopic and rotatably connected support part; the free end of the support part rotates and translates to fit on the panel of the next-level main formwork extension part facing the pier.

[0031] Preferably, a main shaft seat 6 is fixedly provided on the cantilever platform, and a main hydraulic cylinder 4 is hingedly supported on the cantilever platform located on both sides of the main shaft seat; a main connecting ear 7 connected to the main shaft seat pin shaft is fixedly provided on the lower part of the main template; and the power output end of the main hydraulic cylinder is hingedly supported on the upper part of the main template.

[0032] Preferably, the extension part includes an extension template 2 and an extension hydraulic cylinder 3; the top and bottom of the extension template are respectively slidably guided and buckled on the top and bottom surfaces of the main template, one side of the extension template slides horizontally out of the main template, and the upper and lower parts of the back side of the extension template are horizontally supported by an extension hydraulic cylinder; the extension hydraulic cylinder is fixed on the main template in a horizontal posture, and the power output end of the extension hydraulic cylinder is fixedly connected to and laterally supports the extension template.

[0033] Preferably, hook plates 12 are fixedly provided on the top and bottom of the extension formwork, and the middle part of the extension formwork is made into a thin-walled plate that slides and fits on the casting surface of the main formwork; the hook plates are respectively slidably fastened on the top and bottom surfaces of the main formwork, and the hook plates provide sliding guide support with anti-deformation strength for the thin-walled plate in the middle part of the extension formwork, and the hook plates are fixedly supported on the power output end of the extension hydraulic cylinder.

[0034] Preferably, the supporting part includes a supporting plate 10, a hydraulic hinge rod 8 and a push hydraulic cylinder 9, wherein one end of the supporting plate is a thin-walled plate that slides horizontally and rotates to fit on the casting surface of the main formwork, and the other end of the supporting plate horizontally protrudes out of the main formwork; the hydraulic hinge rod is hingedly connected to the upper part of one end of the main formwork, and the power output end of the hydraulic hinge rod is hingedly supported to the upper part of the supporting plate; the push hydraulic cylinder is fixedly arranged at the lower part of one end of the main formwork, and the power output end of the push hydraulic cylinder rotates and supports the lower part of the supporting plate through a universal ball.

[0035] Preferably, the hydraulic hinge rod includes a first hydraulic cylinder 14 and a second hydraulic cylinder 13, and one end of the first hydraulic cylinder and the second hydraulic cylinder are hingedly connected to the upper back portion of one end of the main template through a hinge seat, wherein the power output end of the first hydraulic cylinder is hingedly connected to the upper back portion of the support plate through a hinge seat, and the power output end of the second hydraulic cylinder is hingedly supported to the middle portion of the cylinder body of the first hydraulic cylinder.

[0036] Preferably,

[0037] A hydraulic cylinder and a guide support block 18 are fixedly provided at the lower part of one end of the main template; the piston rod of the hydraulic cylinder slides through the guide support block, and a universal ball seat 17 is fixedly provided at the end of the piston rod of the hydraulic cylinder;

[0038] A universal ball head 16 is fixedly arranged at the bottom of the back of the support plate in a horizontal posture. One end of the universal ball head is fixedly connected through a mounting seat 15 fixed to the back of the support plate, and the other end of the universal ball head is rotatably inserted in the universal ball seat.

[0039] In addition, the present invention is preferably, Figure 1 , 2 As shown in 4, the top and bottom of the support plate are uniformly formed into a curved filling plate with an arc curve. When the support plate rotates with the universal ball head as the axis, the angular gap generated by the support plate rotating at one end of the main template is blocked.

[0040] In addition, the present invention preferably, when pouring the straight section of the pier column, the non-diameter-changing posture on the back of the main template is as follows: Figure 2 As shown in the figure, the circumferential end-to-end connection distribution principle of the main template when pouring the vertical section 11 of the pier column is as follows Figure 3 When pouring the pier column variable diameter section 20, the variable diameter posture on the back of the main template is as shown in Figure 4 As shown in the figure, the principle of the circumferential end-to-end connection distribution of the main formwork when pouring the pier column variable diameter section is as follows Figure 5 shown.

[0041] The working principle of the present invention is:

[0042] Since the main formwork of the present invention is a plane formwork, it is mostly used for casting polygonal piers after being connected from head to tail. During casting, the supporting part of the upper-level main formwork is translated and rotated to fit onto the casting surface of the extended part of the lower-level main formwork, thereby achieving sealing of the joints at the corners with variable diameters, solving the problem that the joints are small at the bottom and large at the top, making it difficult to achieve connection and sealing through a deformable structure.

[0043] When pouring the straight section pier, the extension part and the supporting part are both retracted to the inside of the two ends of the main formwork. At this time, the main formwork is parallel to the vertical plane.

[0044] When pouring the variable diameter section pier, the extension part extends out, the support part extends out and rotates with the universal ball head as the axis to support the extension part of the next level main template. In order to optimize the sealing effect, a sealing strip can be compositely bonded on the edge of the support plate. It should be noted that the casting surface of the same main template, the support plate and the extension template always move in the same plane, and the support plate and the extension template change their inclination synchronously with the adjustment of the inclination of the main template when the diameter is changed.

[0045] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A cantilever formwork for a foundation pit variable diameter pier, comprising a cantilever platform, on which a plurality of main formworks are connected end to end in a circumferential direction with the pier as a reference, and an area surrounded by the plurality of main formworks is a casting area for the pier; Features: The main formwork is connected to the cantilever platform by adjusting the radial inclination with the pier as a reference. One end of the main formwork is provided with a horizontally telescopic extension portion, and the other end of the main formwork is provided with a horizontally telescopic and rotatably connected support portion; the free end of the support portion rotates and translates to fit on the panel of the next-level main formwork extension portion facing the pier.

2. The cantilever formwork for the variable diameter pier column of the foundation pit according to claim 1, characterized in that: A main shaft seat is fixedly provided on the cantilever platform, and main hydraulic cylinders are hingedly supported on the cantilever platforms on both sides of the main shaft seat; a main connecting ear connected to the main shaft seat pin shaft is fixedly provided on the lower part of the main template; the power output end of the main hydraulic cylinder is hingedly supported on the upper part of the main template.

3. The cantilever formwork for the variable diameter pier column of the foundation pit according to claim 1, characterized in that: The extension part includes an extension template and an extension hydraulic cylinder; the top and bottom of the extension template are respectively slidably guided and buckled on the top and bottom surfaces of the main template, one side of the extension template slides horizontally out of the main template, and the upper and lower parts of the back of the extension template are horizontally supported by extension hydraulic cylinders; the extension hydraulic cylinder is fixedly mounted on the main template in a horizontal posture, and the power output end of the extension hydraulic cylinder is fixedly connected to and laterally supports the extension template.

4. The cantilever formwork for the variable diameter pier column of the foundation pit according to claim 3 is characterized by: The top and bottom of the extension formwork are fixed with hook plates, and the middle part of the extension formwork is made into a thin-walled plate that slides and fits on the casting surface of the main formwork; the hook plates are respectively slidably buckled on the top and bottom surfaces of the main formwork, and the hook plates provide sliding guide support with anti-deformation strength for the thin-walled plate in the middle part of the extension formwork, and the power output end of the extension hydraulic cylinder is fixedly supported on the hook plates.

5. The cantilever formwork for the variable diameter pier column of the foundation pit according to claim 1, characterized in that: The supporting part includes a supporting plate, a hydraulic hinge rod and a horizontal push hydraulic cylinder, wherein one end of the supporting plate is a thin-walled plate that slides horizontally and rotates to fit on the casting surface of the main formwork, and the other end of the supporting plate horizontally protrudes out of the main formwork; the hydraulic hinge rod is hingedly connected to the upper part of one end of the main formwork, and the power output end of the hydraulic hinge rod is hingedly supported to the upper part of the supporting plate; the horizontal push hydraulic cylinder is fixedly arranged at the lower part of one end of the main formwork, and the power output end of the horizontal push hydraulic cylinder rotatably supports the lower part of the supporting plate through a universal ball.

6. The cantilever formwork for the variable diameter pier column of the foundation pit according to claim 5, characterized in that: The hydraulic hinge rod includes a first hydraulic cylinder and a second hydraulic cylinder, one end of the first hydraulic cylinder and the second hydraulic cylinder are hingedly connected to the upper back side of one end of the main template through a hinge seat, wherein the power output end of the first hydraulic cylinder is hingedly connected to the upper back side of the support plate through a hinge seat, and the power output end of the second hydraulic cylinder is hingedly supported to the middle part of the cylinder body of the first hydraulic cylinder.

7. The cantilever formwork for the variable diameter pier of the foundation pit according to claim 5, characterized in that: A hydraulic cylinder and a guide support block are fixedly arranged at the lower part of one end of the main template; the piston rod of the hydraulic cylinder slides through the guide support block, and a universal ball seat is fixedly arranged at the end of the piston rod of the hydraulic cylinder; A universal ball head is fixedly arranged at the bottom of the back of the support plate in a horizontal posture, one end of the universal ball head is fixedly connected through a mounting seat fixed on the back of the support plate, and the other end of the universal ball head is rotatably inserted in the universal ball seat.

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