Folding splicing type template for inner cavity of box girder

Abstract

The invention discloses a folding splicing type template for an inner cavity of a box girder, which comprises a plurality of templates which are spliced oppositely, and each template comprises an upper template and a lower template which are hinged with each other; a plurality of groups of positioning units are connected among the multiple templates in a Y-direction constraint manner; a force bearing connecting assembly is connected between the upper die plate and the lower die plate in a hinged mode, and the force bearing connecting assembly comprises Y-direction steel channels and a plurality of sets of inner supporting tensioning units which are arranged at intervals in the Y direction and connected to the Y-direction steel channels through pin shafts. When the templates are positioned, the Y-direction channel steel and the inner support tensioning unit provide Z-direction jacking force and positioning for the upper template and the lower template of the multi-petal template; and when the template is demoulded, the Y-direction channel steel and the inner support tensioning unit provide Y-direction reciprocating dragging demoulding power for the upper template and the lower template of the multi-petal template. The template can realize rapid inner support positioning and locking and Y-direction reciprocating traction rapid demolding, and is simple in structure and easy to realize.

Description

Technical Field

[0001] The present invention relates to the technical field of box girder formwork, and particularly to a folding and splicing formwork for the inner cavity of a box girder. Background Technique

[0002] Traditional inner cavity formworks for box girders mostly use integral steel formworks or wooden formworks, which have problems such as difficult formwork removal, low reuse rate, and insufficient positioning accuracy. Although existing folding formworks can partially solve the problem of formwork removal, there are still defects in the splicing stability of multi-piece formworks, the control of top support force, and the demoulding efficiency. For example, the hinge structure of the formwork is prone to deformation, and there is a lack of an effective internal support tensioning mechanism, resulting in easy formwork bulging or offset during pouring; during demoulding, manual operation is required for each piece, with low efficiency.

[0003] After retrieval, the following related patents were found:

[0004] Chinese Patent CN211256700U discloses a folding precast box girder inner formwork, belonging to the technical field of bridge precast box girders. The key points of its technical solution are that it includes an inner formwork assembly formed by splicing left and right formworks and having a cavity. Both the left and right formworks are formed by hinging upper and lower formworks. The box girder inner formwork further includes a positioning device for positioning and supporting the inner formwork assembly. The positioning device includes two first connecting components that connect the upper and lower formworks of the left formwork and the upper and lower formworks of the right formwork respectively along the vertical direction, and two second connecting components that connect the two upper formworks on the left and right formworks and the two lower formworks on the left and right formworks respectively along the horizontal direction. After the precast beam is prepared, workers enter the box girder, pull out the positioning rod from the positioning hole through a latch rod, so as to achieve the effect of demoulding, and then the entire inner formwork assembly can be pulled out through a winch, which is very convenient.

[0005] The first connecting rod and the second connecting rod of the above formwork have only one pin connection position, that is, the pin connection position with the transverse tie rod. Therefore, when supporting the upper half and the lower plate part of the vertical formwork, it is difficult for the first connecting rod and the second connecting rod to provide stable vertical support force, and it does not disclose the connection method between the first connecting rod / second connecting rod and the upper / lower formwork, making it difficult to implement on site.

[0006] Therefore, how to design a folding and splicing formwork for the inner cavity of a box girder to solve the above technical problems has become an urgent technical problem for those skilled in the art. Summary of the Invention

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art. For this reason, an object of the present invention is to provide a folding and splicing formwork for the inner cavity of a box girder, which can achieve rapid internal support positioning and locking, as well as rapid demoulding by reciprocating pulling in the Y direction, and has a simple structure and is easy to implement.

[0008] It is convenient to move, can reduce the labor intensity of operators, and improve work efficiency.

[0009] To solve the above problems, the present invention provides a folding and splicing template for the inner cavity of a box girder, which includes multiple flaps of templates spliced opposite to each other. Each flap of the template includes an upper template and a lower template connected by hinge mounting; defining the extension direction of the inner cavity of the box girder as the Y direction, the horizontal direction of the box girder cross-section as the X direction, and the height direction of the box girder as the Z direction.

[0010] Multiple groups of positioning units are connected with Y-direction constraints between the multiple flaps of templates; a load-bearing connection assembly is hinge-mounted between the upper template and the lower template. The load-bearing connection assembly includes a Y-direction channel steel, and multiple groups of inner support and tensioning units arranged at intervals in the Y direction and pin-connected to the Y-direction channel steel.

[0011] When positioning the template, the Y-direction channel steel and the inner support and tensioning units provide Z-direction top support force and positioning for the upper template and the lower template of the multiple flaps of templates.

[0012] When demolding the template, the Y-direction channel steel and the inner support and tensioning units provide demolding power for the upper template and the lower template of the multiple flaps of templates to reciprocally drag in the Y direction.

[0013] Preferably, the inner support and tensioning unit includes upper and lower hinge seats, upper plates, lower plates, X-direction pins, and inner support / tension conversion bolts; both the upper and lower hinge seats include fixed seats, Y-direction pins, and XZ-direction hanging plates. The fixed seats are respectively fixed on the bottom surface of the upper template and the top surface of the lower template, and the Y-direction pins are penetrated and inserted vertically through the fixed seats; the XZ-direction hanging plates are rotationally sleeved on the Y-direction pins, and the upper plate or the lower plate is pin-connected on the YZ vertical plane by the XZ-direction hanging plates.

[0014] The other ends of the upper plate and the lower plate are stacked on the ZX vertical plane, and an X-direction pin and an inner support / tension conversion bolt are penetrated and connected on the stacked part; one end of the X-direction pin also penetrates and is rotationally connected to the Y-direction channel steel.

[0015] Preferably, X-direction through-drawn holes are opened at both Y-direction ends of the channel steel, and the construction end of a winch is hung by the drawn holes to provide demolding power for the Y-direction channel steel to reciprocally drag in the Y direction.

[0016] Preferably, the positioning unit includes a positioning seat, a pin plate, and a pin seat. The positioning seat and the pin seat are respectively fixed on multiple flaps of templates on both sides of the upper and lower connection joints of the template. The pin plate is pin-connected on the positioning seat, and the free end of the pin plate is flipped and clamped in the pin seat on the XZ vertical plane.

[0017] The advantages of the present invention compared with the prior art are as follows:

[0018] The main inventive point of a folding and splicing template for the inner cavity of a box girder of the present invention lies in:

[0019] 1. Multiple sets of inner support tensioning units hinged and connected on the Y-direction channel steel; the relative rotation relationship between the upper plate and the lower plate can be adjusted according to the insertion and extraction of the inner support / tension conversion bolt. When the inner support / tension conversion bolt is inserted, the inner support / tension conversion bolt and the X-direction pin shaft penetrate the upper plate and the lower plate together. According to the principle that two points determine a straight line, at this time, the upper plate and the lower plate are in the Z-direction support posture; when the inner support / tension conversion bolt is pulled out, the upper plate and the lower plate are pin-connected to the Y-direction channel steel through the X-direction pin shaft, which is convenient for applying a more uniform demolding force to the upper formwork and the lower formwork through the upper plate and the lower plate when pulling the Y-direction channel steel in the Y-direction. And as the upper plate and the lower plate undergo relative torsion, the Z-direction length of the inner support tensioning unit is shortened (as shown in Figure 2 at this time, when the upper plate and the lower plate are in a deflected posture, they are respectively hinged and supported by the upper and lower hinge seats), which is convenient for the upper formwork to be demolded after twisting downward.

[0020] 2. The Y-direction positioning structure of the positioning unit between multiple split formworks; it can realize quick locking, fixing, positioning, disassembly and demolding in the Y-direction between multiple split formworks. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic cross-sectional structure diagram of the formwork of the present invention (inner support posture of the formwork);

[0023] Figure 2 It is a schematic cross-sectional structure diagram of the formwork of the present invention (demolding pulling posture of the formwork);

[0024] Figure 3 It is a schematic internal structure diagram of a single-sided formwork of the present invention;

[0025] Figure 4 It is an enlarged partial three-dimensional structure diagram of the present invention;

[0026] In the figure: 1 - upper formwork; 2 - lower formwork; 3 - positioning unit; 4 - Y-direction channel steel; 5 - inner support tensioning unit; 6 - X-direction pin shaft; 7 - inner support / tension conversion bolt; 8 - lower plate; 9 - upper and lower hinge seats; 10 - pin seat; 11 - pin plate; 12 - positioning seat; 13 - pulling hole; 14 - upper plate; 15 - XZ-direction hanging plate; 16 - Y-direction pin shaft; 17 - fixed seat. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and should not be construed as a limitation of the present application.

[0028] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0029] The present invention will be further described in detail below with reference to the accompanying drawings.

[0030] Combined with Figures 1 to 4 , a folding and splicing formwork for the inner cavity of a box girder according to the present invention includes multiple flaps of formwork spliced oppositely. Each flap of formwork includes an upper formwork 1 and a lower formwork 2 that are hingedly connected; the extending direction of the inner cavity of the beam box is defined as the Y direction, the horizontal direction of the beam box section is the X direction, and the height direction of the beam box is the Z direction.

[0031] Multiple groups of positioning units 3 are connected in a Y-direction constraint between the multiple flaps of formwork; a load-bearing connection assembly is hingedly connected between the upper formwork and the lower formwork. The load-bearing connection assembly includes a Y-direction channel steel 4 and multiple groups of inner support tensioning units 5 that are arranged at intervals in the Y direction and are pin-connected to the Y-direction channel steel.

[0032] When positioning the formwork, the Y-direction channel steel and the inner support tensioning units provide a Z-direction jacking force and positioning for the upper formwork and the lower formwork of the multiple flaps of formwork.

[0033] When demolding the formwork, the Y-direction channel steel and the inner support tensioning units provide a demolding force for reciprocating dragging in the Y direction for the upper formwork and the lower formwork of the multiple flaps of formwork.

[0034] Preferably, the inner support tensioning unit includes upper and lower hinge seats 9, an upper plate 14, a lower plate 8, an X-direction pin 6, and an inner support / tension conversion bolt 7; the upper and lower hinge seats each include a fixed seat 17, a Y-direction pin 16, and an XZ-direction hanging plate 15. The fixed seats are respectively fixed on the bottom surface of the upper formwork and the top surface of the lower formwork. The Y-direction pin penetrates and is inserted into the fixed seat in the Y direction; the XZ-direction hanging plate is rotatably sleeved on the Y-direction pin, and the upper plate or the lower plate is pin-connected by the XZ-direction hanging plate on the YZ vertical plane.

[0035] The other ends of the upper plate and the lower plate are stacked on the ZX vertical plane, and an X-direction pin shaft and an internal support / tension conversion bolt are connected through the stack portion in the X direction; one end of the X-direction pin shaft also penetrates and is rotatably connected to the Y-direction channel steel.

[0036] Preferably, X-direction through-drawn holes 13 are provided at both Y-direction ends of the channel steel, and the power end of the winch is hung by the drawn holes to provide the demolding power of reciprocating dragging in the Y direction for the Y-direction channel steel.

[0037] Preferably, the positioning unit includes a positioning seat 12, a pin plate 11 and a pin seat 10. The positioning seat and the pin seat are respectively fixed on the multi-piece templates on both sides of the upper and lower connection joints of the template. A pin shaft is connected to the pin plate on the positioning seat, and the free end of the pin plate is turned over on the XZ vertical plane and clamped in the pin seat.

[0038] The working principle of the present invention is as follows:

[0039] When positioning the template, as Figure 1 shown; the X-direction pin shaft and the internal support / tension conversion bolt are simultaneously inserted into the overlapping section of the upper plate and the lower plate, and the upper plate and the lower plate are supported and locked in the Z direction by the X-direction pin shaft and the internal support / tension conversion bolt, so as to provide Z-direction top support positioning for the upper template and the lower template.

[0040] When demolding the template, as Figure 2 shown; when demolding, it is necessary to apply pulling forces in the opposite direction in the drawn holes at both ends of the Y-direction channel steel. In actual construction, a winch hook can be used to hoist and pull the drawn holes to keep the output of the winches at both ends of the Y-direction channel steel balanced, so as to perform the Y-direction pulling positioning of the Y-direction channel steel and keep the Y-direction channel steel in its current position;

[0041] Then, the staff enters the template and removes the internal support / tension conversion bolt. At this time, the pulling forces at both ends of the Y-direction channel steel are balanced, and the Y-direction channel steel is still in the template positioning position;

[0042] Then, the staff withdraws from the template, and alternately disconnects the power supply of the winches at both ends of the Y-direction channel steel, so that the Y-direction channel steel receives reciprocating pulling forces at both Y-direction ends until the upper template is demolded downward;

[0043] Finally, one side of the winch pulls one end of the Y-direction channel steel to drag the overall template out of the inner cavity of the box girder to complete demolding.

[0044] The above describes the present invention and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design similar structural manners and embodiments without creative efforts without departing from the purpose of the present invention, they should fall within the protection scope of the present invention.

Claims

1. A folding and splicing formwork for the inner cavity of a box girder, comprising multiple flaps of formwork spliced oppositely, and each flap of formwork includes an upper formwork and a lower formwork hingedly connected; defining the extending direction of the inner cavity of the box girder as the Y direction, the horizontal direction of the cross-section of the box girder as the X direction, and the height direction of the box girder as the Z direction. It is characterized in that: A plurality of positioning units are constraint-connected in the Y direction between the multiple flaps of formwork; a load-bearing connection assembly is hingedly connected between the upper formwork and the lower formwork, and the load-bearing connection assembly includes a Y-direction channel steel, and a plurality of inner support tensioning units arranged at intervals in the Y direction and pin-connected to the Y-direction channel steel. When positioning the formwork, the Y-direction channel steel and the inner support tensioning units provide a Z-direction jacking force and positioning for the upper formwork and the lower formwork of the multiple flaps of formwork. When demolding the formwork, the Y-direction channel steel and the inner support tensioning units provide a demolding power for reciprocating dragging in the Y direction for the upper formwork and the lower formwork of the multiple flaps of formwork.

2. The folding and splicing formwork for the inner cavity of a box girder according to claim 1, wherein: The inner support tensioning unit includes upper and lower hinge seats, an upper plate, a lower plate, an X-direction pin shaft, and an inner support / tension conversion bolt; the upper and lower hinge seats each include a fixed seat, a Y-direction pin shaft, and an XZ-direction hanging plate. The fixed seats are respectively fixed on the bottom surface of the upper formwork and the top surface of the lower formwork, and the Y-direction pin shaft is penetrated and inserted vertically through the fixed seats; the XZ-direction hanging plate is rotatably sleeved on the Y-direction pin shaft, and the upper plate or the lower plate is pin-connected on the YZ vertical plane by the XZ-direction hanging plate. The other ends of the upper plate and the lower plate are stacked on the ZX vertical plane, and an X-direction pin shaft and an inner support / tension conversion bolt are penetrated and connected in the stacking part in the X direction; one end of the X-direction pin shaft also penetrates and rotatably connects to the Y-direction channel steel.

3. The foldable and splicable formwork for the inner cavity of a box girder according to claim 2, wherein: Pulling holes penetrating in the X direction are formed at both Y-direction ends of the channel steel, and the pulling force application end of a winch is hung by the pulling holes to provide a demolding power for reciprocating dragging in the Y direction for the Y-direction channel steel.

4. A folding and splicing formwork for the inner cavity of a box girder according to claim 1, wherein: The positioning unit includes a positioning seat, a pin plate, and a pin seat. The positioning seat and the pin seat are respectively fixed on multiple flaps of formwork on both sides of the upper and lower connection joints of the formwork. The pin plate is pin-connected to the positioning seat, and the free end of the pin plate is turned over and clamped in the pin seat on the XZ vertical plane.

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