A cantilever formwork for foundation pit variable diameter pier

Abstract

The application discloses a cantilever formwork of a foundation pit variable-diameter pier column, which comprises a cantilever platform, a plurality of main formworks are connected in a head-tail mode in a circumferential direction with the pier column as a reference on the cantilever platform, and an area surrounded by the main formworks is a pouring area of the pier column; the main formwork is connected on the cantilever platform in a radial inclination angle adjustment mode with the pier column as a reference, one end of the main formwork is provided with a horizontal telescopic extension part, and the other end of the main formwork is provided with a horizontal telescopic and rotary supporting part; a free end of the supporting part is rotationally and translationally attached to a panel of an extension part of a next-stage main formwork and faces the pier column. The cantilever formwork controls a variable-diameter slope angle through radial positioning and inclination angle adjustment of the main formwork, and the horizontal telescopic extension parts at two ends of the main formwork are matched with the horizontal telescopic and rotary supporting parts to realize head-tail supporting connection between the main formworks, so that the problem that a corner gap of the variable-diameter pier column is small at a lower position and large at an upper position and is difficult to block is solved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete pouring 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 entire cantilever formwork, so as to realize the step-by-step casting of the pier from top to bottom.

[0003] However, when casting variable-diameter piers, the formwork often needs to be reconfigured based on the pier's gradient. The formwork must also be repositioned and resealed at an angle on the cantilever platform. This construction method not only requires separate formwork for each pier size, but also involves frequent hoisting, splicing, and disassembly work at high altitude, resulting in long construction times and high costs. Once a single pier is cast, the formwork cannot be reused for casting piers with different gradients due to the limited inclination angles at the leading and trailing 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 variable diameter piers in foundation pits. The cantilever formwork uses the radial positioning inclination of the main formwork to control the variable diameter slope angle. The cantilever formwork is connected by horizontally telescopic extensions at both ends of the main formwork in conjunction with horizontally telescopic and rotatably supported support parts to achieve end-to-end support connections between multiple main formworks, thereby solving the problem of the variable diameter pier corner gap being smaller at the bottom and larger at the top, which is 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 the pouring area of ​​the pier column;

[0007] The main formwork is connected to the cantilever platform with the radial inclination adjusted with reference to the pier. 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 the panel of the next-level main formwork extension part facing the pier.

[0008] Preferably, a main shaft seat is fixed on the cantilever platform, and a main hydraulic cylinder is hingedly supported on the cantilever platform on both sides of the main shaft seat; a main connecting ear connected to the main shaft seat pin shaft is fixed 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.

[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 back sides of the extension template are horizontally supported by the 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.

[0010] Preferably, hook plates are fixed 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 fixed to support the power output end of the extension hydraulic cylinder.

[0011] Preferably, the supporting part includes a supporting plate, a hydraulic hinge 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 is hingedly connected to the upper part of one end of the main formwork, and the power output end of the hydraulic hinge 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.

[0012] Preferably, the hydraulic hinge rod includes a first hydraulic cylinder and a second hydraulic cylinder, 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.

[0013] Preferably,

[0014] A hydraulic cylinder and a guide support block 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 is fixedly provided at the end of the piston rod of the hydraulic cylinder;

[0015] A universal ball head is fixedly provided on the bottom of the back of the supporting 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 supporting 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] The present invention provides a cantilever formwork for a variable diameter pier column of a foundation pit. First, the variable diameter section of the variable diameter pier column is cast by a main formwork supported by an inclination adjustment on a cantilever platform, and the extension amount of the main hydraulic cylinder is adjusted 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 provided at both ends of the main formwork. During operation, 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. 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 that the upper-level main formwork and the lower-level main formwork are sealed and abutted 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 following briefly introduces the drawings required for use in the embodiments or technical descriptions. 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 any creative work.

[0019] Figure 1 Schematic diagram of the construction posture of the cantilever formwork in the present invention;

[0020] Figure 2 Schematic diagram of the non-diameter-variable posture of the back side of the main formwork in the present invention (vertical section of the cast pier);

[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 Schematic diagram of the diameter-changing posture of the back of the main formwork in the present invention (the diameter-changing section for casting pier columns);

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

[0024] Figure 6 This is a schematic diagram of the variable diameter pier structure 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 filling plate; 20-pier column reducing section. DETAILED DESCRIPTION

[0026] The following describes in detail embodiments of the present application. 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 are not to be construed as limiting the present application.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0028] The present invention will be described in further detail below with reference to the accompanying drawings.

[0029] Combine Figures 1 to 6 The cantilever formwork for a variable diameter pier column of a foundation pit 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 column as a reference, and the area surrounded by the plurality of main formworks is the pouring area of ​​the pier column;

[0030] The main formwork is connected to the cantilever platform with the radial inclination adjusted with reference to the pier. 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 the panel of the next-level main formwork extension part facing the pier.

[0031] Preferably, a main shaft seat 6 is fixed on the cantilever platform, and a main hydraulic cylinder 4 is hingedly supported on the cantilever platforms on both sides of the main shaft seat; a main connecting ear 7 connected to the main shaft seat pin shaft is fixed 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.

[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 back sides of the extension template are horizontally supported by the 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 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 fixed to support the power output end of the extension hydraulic cylinder.

[0034] Preferably, the supporting part includes a supporting plate 10, a hydraulic hinge 8 and a horizontal 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 is hingedly connected to the upper part of one end of the main formwork, and the power output end of the hydraulic hinge is hinged to support the upper part of the supporting plate; the horizontal push hydraulic cylinder is fixedly installed 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.

[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 fixed to 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 fixed to the end of the piston rod of the hydraulic cylinder;

[0038] A universal ball head 16 is fixedly provided on 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 on the back of the support plate, and the other end of the universal ball head is rotatably inserted into the universal ball seat.

[0039] In addition, the present invention is preferably Figure 1 、 2 As shown in Figure 4, the top and bottom of the support plate are uniformly formed into curved filling plates with cambered curves. 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, the principle of the circumferential end-to-end connection distribution 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. Figure 4 As shown in the figure, the principle of the circumferential end-to-end connection distribution of the main template 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 flat 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 on the casting surface of the extended part of the lower-level main formwork, thereby achieving sealing of the joints at the corners of variable diameter, solving the problem that the joints are small at the bottom and large at the top, and it is difficult to achieve connection sealing through a deformable structure.

[0043] When casting the straight section pier, the extension part and the supporting part are 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 casting the variable diameter pier, the extension is extended, and the support is extended. Rotating around the universal ball joint, it rests against the extension of the next main formwork. To optimize the sealing effect, a sealing strip can be bonded to the edge of the support plate. It is important to note that within the casting surface of the same main formwork, the support plate and the extension formwork always move in the same plane. Their inclination changes in sync with the main formwork's inclination during the diameter change.

[0045] The present invention and its embodiments are described above. This 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 a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A cantilever formwork for a variable diameter pier column in 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, wherein the area enclosed by the plurality of main formworks serves as a casting area for the pier column; Its characteristics are: The main formwork is connected to the cantilever platform with radial inclination adjustment based on the pier column 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 column; The cantilever platform is fixed with a main shaft seat, and the cantilever platforms on both sides of the main shaft seat are hingedly supported with main hydraulic cylinders; the lower part of the main template is fixed with a main connecting ear connected to the main shaft seat pin; the power output end of the main hydraulic cylinder is hingedly supported on the upper part of the main template; The extension portion 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 the extension hydraulic cylinder; 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; The supporting part includes a supporting plate, a hydraulic hinge 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 is hingedly connected to the upper part of one end of the main formwork, and the power output end of the hydraulic hinge is hingedly supported on the upper part of the supporting plate; the horizontal push hydraulic cylinder is fixedly arranged on 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.

2. The cantilever formwork for a foundation pit variable diameter pier according to claim 1, characterized in that: 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 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 power output end of the extension hydraulic cylinder is fixedly supported on the hook plates.

3. The cantilever formwork for a foundation pit with variable diameter pier according to claim 1, characterized in that: The hydraulic hinge rod includes a first hydraulic cylinder and a second hydraulic cylinder, and one end of the first hydraulic cylinder and the second hydraulic cylinder are hingedly connected to the upper back part 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 part 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.

4. The cantilever formwork for a foundation pit with variable diameter pier according to claim 1, characterized in that: A hydraulic cylinder and a guide support block 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 is fixedly provided at the end of the piston rod of the hydraulic cylinder; A universal ball head is fixedly provided on 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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