Telescopic adjustable inner form for prestressed concrete cable-stayed bridge construction

Abstract

The present application belongs to the technical field of box girder construction, and particularly relates to a telescopic adjustment inner mold for prestressed concrete cable-stayed bridge construction, which comprises a bottom plate, moving rollers, hydraulic support columns, a support plate, vertical plates, horizontal support frames, side support frames, telescopic adjustment assemblies and an annular belt. The moving rollers are installed on the lower side of the bottom plate. The upper side of the bottom plate is fixed with the lower side of the support plate through the hydraulic support columns. The vertical plates are installed at the four corners of the support plate. The vertical plates on the same side are jointly fixed with the horizontal support frames. The outer ends of the horizontal support frames are rotatably connected with the side support frames. The telescopic adjustment assemblies are installed between the horizontal support frames and the side support frames. The outer sides of the horizontal support frames and the side support frames are jointly and sleevedly installed with the annular belt. The present application has a reasonable structure design. The annular belt can circularly displace along the construction surface under the support of the annular belt support system, that is, has a translation function, and can quickly adjust the position of the inner mold according to the construction progress.

Description

Technical Field

[0001] This invention belongs to the field of box girder construction technology, specifically relating to a telescopic adjustable inner formwork for the construction of prestressed concrete cable-stayed bridges. Background Technology

[0002] Currently, the main girder construction of cable-stayed bridges generally employs the cantilever casting method. However, when the girder height changes in the cable-stayed section, the web and top plate of the box girder gradually transition, making it impossible to use the internal formwork support method with a sliding beam inside the hanging basket. Therefore, in the transition sections of the cable-stayed bridge, a modular scaffold is typically erected, and then the internal formwork support is built on top of this scaffold for segmented cast-in-place concrete construction. However, on-site erection of the internal formwork support is not only inefficient, but also requires rebuilding the internal formwork support for each box girder segment, which is time-consuming, labor-intensive, and impacts the construction schedule.

[0003] To address this, Chinese Patent Publication No. CN113529584B discloses a telescopic adjustable inner formwork for the construction of prestressed concrete cable-stayed bridges. This formwork includes an inner formwork skeleton used in conjunction with a bottom formwork. The inner formwork skeleton includes a top plate skeleton, with cross slope skeletons hinged to both sides along its length. A web skeleton is hinged to the side of the cross slope skeleton away from the top plate skeleton. The width of the top plate skeleton is adjustable, and adjusting components for adjusting the inclination angle of the cross slope skeletons are provided between the top plate skeleton and the two sets of cross slope skeletons. By adjusting the width of the inner formwork skeleton, and thereby adjusting its height, the construction requirements of the changing section box girder can be quickly adapted, improving the construction efficiency of the cantilever beam of the changing section of the cable-stayed bridge and reducing construction costs.

[0004] However, this type of telescopic adjustable inner formwork for prestressed concrete cable-stayed bridge construction still has shortcomings in use. First, it does not have a translation function and cannot adjust the position of the inner formwork according to the construction progress. Second, the inclination angles on both sides cannot be quickly adjusted according to the requirements. Therefore, its structure needs to be optimized and improved. Summary of the Invention

[0005] The purpose of this invention is to overcome the aforementioned problems in traditional technologies and provide a telescopic adjustable inner mold for the construction of prestressed concrete cable-stayed bridges.

[0006] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0007] A telescopic adjustable inner mold for the construction of a prestressed concrete cable-stayed bridge includes a base plate, movable rollers, hydraulic support columns, support plates, upright plates, horizontal support frames, side support frames, telescopic adjustment components, and an annular belt. Movable rollers are installed on the lower side of the base plate. The upper side of the base plate is fixed to the lower side of the support plate via hydraulic support columns. Upright plates are installed at the four corners of the support plate. Horizontal support frames are fixed to the upright plates on the same side. Side support frames are rotatably connected to the outer ends of the horizontal support frames. A telescopic adjustment component for adjusting the inclination angle between the horizontal support frames and the side support frames is installed between them. An annular belt is fitted onto the outer sides of the horizontal support frames and the side support frames. The belt located above the horizontal support frames and the side support frames serves as the inner mold.

[0008] Furthermore, in the aforementioned telescopic adjustable inner mold for the construction of prestressed concrete cable-stayed bridges, a maintenance through groove is provided at the center of each of the bottom plate and the support plate.

[0009] Furthermore, in the aforementioned telescopic adjustable inner mold for the construction of prestressed concrete cable-stayed bridges, the movable rollers are equipped with a self-locking mechanism to facilitate locking their position.

[0010] Furthermore, in the aforementioned telescopic adjustable inner mold for the construction of prestressed concrete cable-stayed bridges, the telescopic adjustment assembly includes a first beam plate, a second beam plate, ear seats, and a first hydraulic push rod. The first beam plate is fixed between two opposing horizontal support frames, and the second beam plate is fixed between two opposing side support frames. Ear seats are fixed to the lower sides of the first beam plate and the second beam plate respectively. A first hydraulic push rod is installed between the two ear seats. The outer end of the cylinder and the outer end of the movable rod of the first hydraulic push rod are each hinged to the adjacent ear seat.

[0011] Furthermore, in the aforementioned telescopic adjustable inner formwork for the construction of prestressed concrete cable-stayed bridges, the horizontal support frame has a first mounting groove for facilitating the installation of the first beam plate, and the side support frame has a second mounting groove for facilitating the installation of the second beam plate.

[0012] Furthermore, in the aforementioned telescopic adjustable inner mold for the construction of prestressed concrete cable-stayed bridges, the upper inner side of the upright plate is provided with a locking block that facilitates insertion into the first installation groove.

[0013] Furthermore, the aforementioned telescopic adjustable inner mold for the construction of prestressed concrete cable-stayed bridge also includes a tensioning assembly. The tensioning assembly includes a second hydraulic push rod and a tensioning roller seat. The second hydraulic push rod is fixedly installed on the lower side of the first beam plate. The movable end of the second hydraulic push rod is equipped with a tensioning roller seat. The position of the second hydraulic push rod is offset from the position of the lug seat on the lower side of the first beam plate. A tensioning roller that can rotate freely is installed in the tensioning roller seat.

[0014] Furthermore, in the aforementioned telescopic adjustable inner mold for the construction of prestressed concrete cable-stayed bridges, the inner side of the vertical plate is provided with a guide groove that slides in cooperation with the tensioning roller seat.

[0015] Furthermore, in the aforementioned telescopic adjustable inner mold for the construction of prestressed concrete cable-stayed bridges, the annular belt includes an annular outer wear-resistant rubber layer, an inner wear-resistant rubber layer, and an intermediate skeleton layer. The outer wear-resistant rubber layer, the inner wear-resistant rubber layer, and the intermediate skeleton layer are vulcanized as a whole. The intermediate skeleton layer is composed of carbon fiber ropes spirally wound on the inner wear-resistant rubber layer, and the spiral winding pitch of the carbon fiber ropes is 2-4 mm.

[0016] Furthermore, in the aforementioned adjustable inner mold for prestressed concrete cable-stayed bridge construction, the method for preparing the annular belt includes the following steps:

[0017] 1) At room temperature, a strip of rubber is wound around the driving roller and the driven roller, and the joint of the strip of rubber is bonded to form an inner wear-resistant rubber layer for the annular conveyor belt;

[0018] 2) The carbon fiber rope is pulled by a tensioner and the lead end of the carbon fiber rope is fixed to one end of the inner wear-resistant rubber layer in the width direction; the active roller rotates, so that the carbon fiber rope is spirally wound from one end to the other along the width direction of the inner wear-resistant rubber layer on the annular surface of the inner wear-resistant rubber layer. When the carbon fiber rope is spirally wound, the initial section is accelerated winding, the middle section is uniform winding, and the final section is decelerated winding until the winding speed is zero, finally forming the intermediate skeleton layer; strip-shaped rubber sheets are attached to the intermediate skeleton layer and the joints of the strip-shaped rubber sheets are bonded to form the outer wear-resistant rubber layer of the annular belt.

[0019] 3) The inner wear-resistant rubber layer, the middle skeleton layer and the outer wear-resistant rubber layer are vulcanized as a whole. The vulcanization temperature is 155-160℃, the vulcanization time is 30-40min and the surface pressure is 16-28MPa to form an annular belt.

[0020] The beneficial effects of this invention are:

[0021] 1. The present invention has a reasonable structural design. It utilizes a ring belt support system composed of a horizontal support frame, a side support frame, and a telescopic adjustment component to provide effective support for the ring belt. The ring belt is installed on the outer side of the horizontal support frame and the side support frame. The belt body above the horizontal support frame and the side support frame serves as the inner mold. The inclination angle between the horizontal support frame and the side support frame can be adjusted using the telescopic adjustment component, which can quickly adapt to the construction requirements of the changing box girder. Under the support of the ring belt support system, the ring belt can circulate along the construction surface, that is, it has a translation function and can quickly adjust the position of the inner mold as the construction progresses. The outer side of the ring belt part that is about to be converted into the inner mold can be coated with oil, and the surface of the ring belt that is about to be separated from the inner mold position can be cleaned. The surface coating and surface cleaning are carried out using the inspection channel.

[0022] 2. The present invention adds a tensioning component to the annular belt support system. The tensioning component includes a second hydraulic push rod and a tensioning roller seat. The tensioning component can ensure that the annular belt always maintains a certain tension and will not become too loose or too tight as the inclination angle changes.

[0023] 3. The annular belt in this invention includes an annular outer wear-resistant rubber layer, an inner wear-resistant rubber layer, and an intermediate skeleton layer. The outer wear-resistant rubber layer, the inner wear-resistant rubber layer, and the intermediate skeleton layer are vulcanized into one piece. The intermediate skeleton layer is composed of carbon fiber rope spirally wound on the inner wear-resistant rubber layer. The annular belt has a reasonable structural design and good compressive strength.

[0024] Of course, any product implementing this invention does not necessarily need to achieve all of the above advantages at the same time. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the overall front view structure of the present invention;

[0027] Figure 2 This is a three-dimensional structural diagram of the present invention with the annular band omitted;

[0028] Figure 3 This is a schematic diagram of the structure of the base plate and its components in this invention;

[0029] Figure 4 This is a schematic diagram of the structure of the support plate and its components in this invention;

[0030] Figure 5 This is a schematic diagram of the main structure of the annular belt support system in this invention;

[0031] Figure 6 This is a three-dimensional structural diagram of the annular belt support system in this invention;

[0032] Figure 7 This is a schematic diagram showing the connection between the horizontal support frame and the side support frame in this invention;

[0033] Figure 8 This is a schematic diagram of the telescopic adjustment component in this invention;

[0034] Figure 9 This is a schematic diagram of the tensioning component in this invention;

[0035] Figure 10 This is a schematic diagram illustrating the composition of the annular belt in this invention;

[0036] In the attached diagram, the component numbers are as follows:

[0037] 1-Base plate, 2-Moving roller, 3-Hydraulic support column, 4-Support plate, 5-Upright plate, 6-Horizontal support frame, 7-Side support frame, 8-First mounting groove, 9-First beam plate, 10-Second mounting groove, 11-Second beam plate, 12-Ear seat, 13-First hydraulic push rod, 14-Second hydraulic push rod, 15-Tensioning roller seat, 16-Guide vertical groove, 17-Annular belt, 171-Outer wear-resistant rubber layer, 172-Inner wear-resistant rubber layer, 173-Intermediate skeleton layer. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1

[0040] Please see Figures 1-8 As shown, this embodiment is a telescopic adjustable inner mold for the construction of a prestressed concrete cable-stayed bridge, including a base plate 1, movable rollers 2, hydraulic support columns 3, support plates 4, upright plates 5, horizontal support frames 6, side support frames 7, telescopic adjustment components, and annular belt 17. Movable rollers 2 are installed on the lower side of the base plate 1, and the upper side of the base plate 1 is fixed to the lower side of the support plate 4 via hydraulic support columns 3. Upright plates 5 are installed at the four corners of the support plate 4, and horizontal support frames 6 are fixed together on the same side of the upright plates 5. Side support frames 7 are rotatably connected to the outer ends of the horizontal support frames 6. A telescopic adjustment component for adjusting the inclination angle between the horizontal support frames 6 and the side support frames 7 is installed between them. Annular belt 17 is sleeved on the outer sides of the horizontal support frames 6 and the side support frames 7, and the belt 17 located above the horizontal support frames 6 and the side support frames 7 serves as the inner mold.

[0041] In this embodiment, a maintenance through groove is provided at the center of both the base plate 1 and the support plate 4. The design of the maintenance through groove facilitates maintenance personnel to inspect and repair the components.

[0042] In this embodiment, the movable roller 2 is equipped with a self-locking mechanism to facilitate locking its position, and the number of movable rollers 2 is set according to the actual load-bearing requirements.

[0043] In this embodiment, the telescopic adjustment assembly includes a first beam plate 9, a second beam plate 11, an ear seat 12, and a first hydraulic push rod 13. The first beam plate 9 is fixed between two opposing horizontal support frames 6, and the second beam plate 11 is fixed between two opposing side support frames 7. An ear seat 12 is fixed to the lower side of each of the first beam plate 9 and the second beam plate 11. The first hydraulic push rod 13 is installed between the two ear seats 12. The outer end of the cylinder body and the outer end of the movable rod of the first hydraulic push rod 13 are respectively hinged to the adjacent ear seat 12.

[0044] In this embodiment, the horizontal support frame 6 has a first mounting groove 8 for easy installation of the first beam plate 9, and the side support frame 7 has a second mounting groove 10 for easy installation of the second beam plate 11.

[0045] In this embodiment, the upper inner side of the upright plate 5 is provided with a locking block that facilitates insertion into the first mounting groove 8.

[0046] A specific application of this embodiment is as follows: an annular belt support system consisting of a horizontal support frame 6, a side support frame 7, and a telescopic adjustment component is used to provide effective support for the annular belt. An annular belt 17 is fitted on the outer sides of the horizontal support frame 6 and the side support frame 7. The belt body of the annular belt 17 located above the horizontal support frame 6 and the side support frame 7 serves as an inner mold. The inclination angle between the horizontal support frame 6 and the side support frame 7 can be adjusted using the telescopic adjustment component, which can quickly adapt to the construction requirements of the changing section box girder. Under the support of the annular belt support system, the annular belt 17 can circulate along the construction surface, that is, it has a translation function, and the position of the inner mold can be quickly adjusted according to the construction progress. The outer side of the annular belt 17 part that is about to be transformed into an inner mold can be coated with oil, and the surface of the annular belt 17 that is about to be separated from the inner mold position can be cleaned. The surface coating and surface cleaning are carried out using the inspection channel.

[0047] Example 2

[0048] Please see Figures 1-9 As shown, this embodiment is a telescopic adjustable inner mold for the construction of a prestressed concrete cable-stayed bridge, including a base plate 1, movable rollers 2, hydraulic support columns 3, support plates 4, upright plates 5, horizontal support frames 6, side support frames 7, telescopic adjustment components, and annular belt 17. Movable rollers 2 are installed on the lower side of the base plate 1, and the upper side of the base plate 1 is fixed to the lower side of the support plate 4 via hydraulic support columns 3. Upright plates 5 are installed at the four corners of the support plate 4, and horizontal support frames 6 are fixed together on the same side of the upright plates 5. Side support frames 7 are rotatably connected to the outer ends of the horizontal support frames 6. A telescopic adjustment component for adjusting the inclination angle between the horizontal support frames 6 and the side support frames 7 is installed between them. Annular belt 17 is sleeved on the outer sides of the horizontal support frames 6 and the side support frames 7, and the belt 17 located above the horizontal support frames 6 and the side support frames 7 serves as the inner mold.

[0049] In this embodiment, a maintenance through groove is provided at the center of both the base plate 1 and the support plate 4. The design of the maintenance through groove facilitates maintenance personnel to inspect and repair the components.

[0050] In this embodiment, the movable roller 2 is equipped with a self-locking mechanism to facilitate locking its position, and the number of movable rollers 2 is set according to the actual load-bearing requirements.

[0051] In this embodiment, the telescopic adjustment assembly includes a first beam plate 9, a second beam plate 11, an ear seat 12, and a first hydraulic push rod 13. The first beam plate 9 is fixed between two opposing horizontal support frames 6, and the second beam plate 11 is fixed between two opposing side support frames 7. An ear seat 12 is fixed to the lower side of each of the first beam plate 9 and the second beam plate 11. The first hydraulic push rod 13 is installed between the two ear seats 12. The outer end of the cylinder body and the outer end of the movable rod of the first hydraulic push rod 13 are respectively hinged to the adjacent ear seat 12.

[0052] In this embodiment, the horizontal support frame 6 has a first mounting groove 8 for easy installation of the first beam plate 9, and the side support frame 7 has a second mounting groove 10 for easy installation of the second beam plate 11.

[0053] In this embodiment, the upper inner side of the upright plate 5 is provided with a locking block that facilitates insertion into the first mounting groove 8.

[0054] In this embodiment, a tensioning assembly is also included, comprising a second hydraulic push rod 14 and a tensioning roller seat 15. The second hydraulic push rod 14 is fixedly installed on the lower side of the first beam plate 9, and the tensioning roller seat 15 is mounted on the movable end of the second hydraulic push rod 14. The position of the second hydraulic push rod 14 is offset from the position of the lower side lug 12 of the first beam plate 9. A tensioning roller capable of free rotation is installed in the tensioning roller seat 15. A guide groove 16 is provided on the inner side of the vertical plate 5 to slide and engage with the tensioning roller seat 15.

[0055] One specific application of this embodiment is: a tensioning component is added to the annular belt support system. The tensioning component includes a second hydraulic push rod 14 and a tensioning roller seat 15. The tensioning component can ensure that the annular belt 17 always maintains a certain tension, and will not become too loose or too tight as the inclination angle changes.

[0056] Example 3

[0057] Please see Figures 1-10As shown, this embodiment is a telescopic adjustable inner mold for the construction of a prestressed concrete cable-stayed bridge, including a base plate 1, movable rollers 2, hydraulic support columns 3, support plates 4, upright plates 5, horizontal support frames 6, side support frames 7, telescopic adjustment components, and annular belt 17. Movable rollers 2 are installed on the lower side of the base plate 1, and the upper side of the base plate 1 is fixed to the lower side of the support plate 4 via hydraulic support columns 3. Upright plates 5 are installed at the four corners of the support plate 4, and horizontal support frames 6 are fixed together on the same side of the upright plates 5. Side support frames 7 are rotatably connected to the outer ends of the horizontal support frames 6. A telescopic adjustment component for adjusting the inclination angle between the horizontal support frames 6 and the side support frames 7 is installed between them. Annular belt 17 is sleeved on the outer sides of the horizontal support frames 6 and the side support frames 7, and the belt 17 located above the horizontal support frames 6 and the side support frames 7 serves as the inner mold.

[0058] In this embodiment, a maintenance through groove is provided at the center of both the base plate 1 and the support plate 4. The design of the maintenance through groove facilitates maintenance personnel to inspect and repair the components.

[0059] In this embodiment, the movable roller 2 is equipped with a self-locking mechanism to facilitate locking its position, and the number of movable rollers 2 is set according to the actual load-bearing requirements.

[0060] In this embodiment, the telescopic adjustment assembly includes a first beam plate 9, a second beam plate 11, an ear seat 12, and a first hydraulic push rod 13. The first beam plate 9 is fixed between two opposing horizontal support frames 6, and the second beam plate 11 is fixed between two opposing side support frames 7. An ear seat 12 is fixed to the lower side of each of the first beam plate 9 and the second beam plate 11. The first hydraulic push rod 13 is installed between the two ear seats 12. The outer end of the cylinder body and the outer end of the movable rod of the first hydraulic push rod 13 are respectively hinged to the adjacent ear seat 12.

[0061] In this embodiment, the horizontal support frame 6 has a first mounting groove 8 for easy installation of the first beam plate 9, and the side support frame 7 has a second mounting groove 10 for easy installation of the second beam plate 11.

[0062] In this embodiment, the upper inner side of the upright plate 5 is provided with a locking block that facilitates insertion into the first mounting groove 8.

[0063] In this embodiment, a tensioning assembly is also included, comprising a second hydraulic push rod 14 and a tensioning roller seat 15. The second hydraulic push rod 14 is fixedly installed on the lower side of the first beam plate 9, and the tensioning roller seat 15 is mounted on the movable end of the second hydraulic push rod 14. The position of the second hydraulic push rod 14 is offset from the position of the lower side lug 12 of the first beam plate 9. A tensioning roller capable of free rotation is installed in the tensioning roller seat 15. A guide groove 16 is provided on the inner side of the vertical plate 5 to slide and engage with the tensioning roller seat 15.

[0064] In this embodiment, the annular belt 17 includes an annular outer wear-resistant rubber layer 171, an inner wear-resistant rubber layer 172, and an intermediate skeleton layer 173. The outer wear-resistant rubber layer 171, the inner wear-resistant rubber layer 172, and the intermediate skeleton layer 173 are vulcanized into one piece. The intermediate skeleton layer 173 is composed of a carbon fiber rope spirally wound on the inner wear-resistant rubber layer 172, and the spiral winding pitch of the carbon fiber rope is 3mm.

[0065] In this embodiment, the preparation method of the annular belt 17 includes the following steps:

[0066] 1) At room temperature, a strip of rubber is wound around the driving roller and the driven roller, and the joint of the strip of rubber is bonded to form an inner wear-resistant rubber layer for the annular conveyor belt;

[0067] 2) The carbon fiber rope is pulled by the tensioner and the lead end of the carbon fiber rope is fixed to one end of the inner wear-resistant rubber layer 172 in the width direction; the active roller rotates, so that the carbon fiber rope is spirally wound from one end to the other along the width direction of the inner wear-resistant rubber layer 172 on the annular surface of the inner wear-resistant rubber layer 172. When the carbon fiber rope is spirally wound, the initial section is accelerated winding, the middle section is uniform winding, and the final section is decelerated winding until the winding speed is zero, finally forming the intermediate skeleton layer 173; strip-shaped rubber sheets are attached to the intermediate skeleton layer 173 and the joints of the strip-shaped rubber sheets are bonded to form the outer wear-resistant rubber layer 171 of the annular belt 17;

[0068] 3) The inner wear-resistant rubber layer 172, the middle skeleton layer 173 and the outer wear-resistant rubber layer 171 are vulcanized as a whole. The vulcanization temperature is 157℃, the vulcanization time is 35min and the surface pressure is 22MPa to form an annular belt 17.

[0069] In this embodiment, the annular belt 17 has a reasonable structural design and good compressive strength.

[0070] Example 4

[0071] In this embodiment, the annular belt 17 includes an annular outer wear-resistant rubber layer 171, an inner wear-resistant rubber layer 172, and an intermediate skeleton layer 173. The outer wear-resistant rubber layer 171, the inner wear-resistant rubber layer 172, and the intermediate skeleton layer 173 are vulcanized into one piece. The intermediate skeleton layer 173 is composed of a carbon fiber rope spirally wound on the inner wear-resistant rubber layer 172, and the spiral winding pitch of the carbon fiber rope is 2mm.

[0072] In this embodiment, the preparation method of the annular belt 17 includes the following steps:

[0073] 1) At room temperature, a strip of rubber is wound around the driving roller and the driven roller, and the joint of the strip of rubber is bonded to form an inner wear-resistant rubber layer for the annular conveyor belt;

[0074] 2) The carbon fiber rope is pulled by the tensioner and the lead end of the carbon fiber rope is fixed to one end of the inner wear-resistant rubber layer 172 in the width direction; the active roller rotates, so that the carbon fiber rope is spirally wound from one end to the other along the width direction of the inner wear-resistant rubber layer 172 on the annular surface of the inner wear-resistant rubber layer 172. When the carbon fiber rope is spirally wound, the initial section is accelerated winding, the middle section is uniform winding, and the final section is decelerated winding until the winding speed is zero, finally forming the intermediate skeleton layer 173; strip-shaped rubber sheets are attached to the intermediate skeleton layer 173 and the joints of the strip-shaped rubber sheets are bonded to form the outer wear-resistant rubber layer 171 of the annular belt 17;

[0075] 3) The inner wear-resistant rubber layer 172, the middle skeleton layer 173 and the outer wear-resistant rubber layer 171 are vulcanized as a whole. The vulcanization temperature is 155℃, the vulcanization time is 40min and the surface pressure is 16MPa to form an annular belt 17.

[0076] Example 5

[0077] In this embodiment, the annular belt 17 includes an annular outer wear-resistant rubber layer 171, an inner wear-resistant rubber layer 172, and an intermediate skeleton layer 173. The outer wear-resistant rubber layer 171, the inner wear-resistant rubber layer 172, and the intermediate skeleton layer 173 are vulcanized into one piece. The intermediate skeleton layer 173 is composed of a carbon fiber rope spirally wound on the inner wear-resistant rubber layer 172, and the spiral winding pitch of the carbon fiber rope is 4mm.

[0078] In this embodiment, the preparation method of the annular belt 17 includes the following steps:

[0079] 1) At room temperature, a strip of rubber is wound around the driving roller and the driven roller, and the joint of the strip of rubber is bonded to form an inner wear-resistant rubber layer for the annular conveyor belt;

[0080] 2) The carbon fiber rope is pulled by the tensioner and the lead end of the carbon fiber rope is fixed to one end of the inner wear-resistant rubber layer 172 in the width direction; the active roller rotates, so that the carbon fiber rope is spirally wound from one end to the other along the width direction of the inner wear-resistant rubber layer 172 on the annular surface of the inner wear-resistant rubber layer 172. When the carbon fiber rope is spirally wound, the initial section is accelerated winding, the middle section is uniform winding, and the final section is decelerated winding until the winding speed is zero, finally forming the intermediate skeleton layer 173; strip-shaped rubber sheets are attached to the intermediate skeleton layer 173 and the joints of the strip-shaped rubber sheets are bonded to form the outer wear-resistant rubber layer 171 of the annular belt 17;

[0081] 3) The inner wear-resistant rubber layer 172, the middle skeleton layer 173 and the outer wear-resistant rubber layer 171 are vulcanized as a whole. The vulcanization temperature is 160℃, the vulcanization time is 30min and the surface pressure is 28MPa to form an annular belt 17.

[0082] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A telescopic adjustable inner form for construction of a prestressed concrete cable-stayed bridge, characterized in that: The utility model provides a movable platform, including bottom plate, mobile roller, hydraulic support column, support plate, stand, horizontal support frame, side support frame, telescopic adjusting assembly and annular belt, the downside of bottom plate is equipped with mobile roller, the upside of bottom plate is fixed with the downside of support plate through hydraulic support column, the four corners of support plate are equipped with stand, the stand of same side is fixed with horizontal support frame in common, the outer end of horizontal support frame is rotatably connected with side support frame, and telescopic adjusting assembly for adjusting the inclination angle between horizontal support frame and side support frame is installed between horizontal support frame and side support frame, and the outer side of horizontal support frame and side support frame is commonly equipped with annular belt, and the belt body at the place above horizontal support frame and side support frame is as inner mode.

2. The telescopic adjustable inner formwork for construction of prestressed concrete cable-stayed bridge according to claim 1, characterized in that: The center of the bottom plate and the support plate is respectively provided with an inspection through slot.

3. The telescopic adjustable inner formwork for construction of prestressed concrete cable-stayed bridge according to claim 1, characterized in that: The mobile roller is provided with a self-locking mechanism for locking the position of the mobile roller.

4. The telescopic adjustable inner formwork for construction of prestressed concrete cable-stayed bridge according to claim 1, characterized in that: The telescopic adjusting assembly comprises a first beam plate, a second beam plate, an ear seat and a first hydraulic push rod, the first beam plate is fixed between the two opposite horizontal support frames, the second beam plate is fixed between the two opposite side support frames, the lower side of each of the first beam plate and the second beam plate is fixed with an ear seat, the first hydraulic push rod is installed between the two ear seats, and the cylinder body outer end portion and the movable rod outer end portion of the first hydraulic push rod are respectively hinged to the adjacent ear seats.

5. The telescopic adjustable inner form for construction of prestressed concrete cable-stayed bridge according to claim 4, characterized in that: The horizontal support frame is provided with a first installation slot for installing the first beam plate, and the side support frame is provided with a second installation slot for installing the second beam plate.

6. The telescopic adjustable inner form for construction of prestressed concrete cable-stayed bridge according to claim 5, characterized in that: The inner side of the upper end of the stand is provided with a clamping block for clamping into the first installation slot.

7. The telescopic adjustable inner form for construction of prestressed concrete cable-stayed bridge according to claim 4, characterized in that: The telescopic adjusting assembly further comprises a second hydraulic push rod and a tensioning roller seat, the second hydraulic push rod is fixedly installed on the lower side of the first beam plate, the movable end of the second hydraulic push rod is provided with the tensioning roller seat, the position of the second hydraulic push rod is staggered with the position of the ear seat on the lower side of the first beam plate, and the tensioning roller seat is provided with a freely rotatable tensioning roller.

8. The telescopic adjustable inner form for construction of prestressed concrete cable-stayed bridge according to claim 7, characterized in that: The inner side of the stand is provided with a guide vertical groove in sliding cooperation with the tensioning roller seat. 9.The telescopic adjustable inner formwork for construction of prestressed concrete cable-stayed bridge according to claim 1, characterized in that: The annular belt comprises an outer wear-resistant rubber layer, an inner wear-resistant rubber layer and an intermediate skeleton layer, the outer wear-resistant rubber layer, the inner wear-resistant rubber layer and the intermediate skeleton layer are vulcanized into one body, the intermediate skeleton layer is composed of a carbon fiber rope spirally wound on the inner wear-resistant rubber layer, and the spiral winding pitch of the carbon fiber rope is 2-4 mm.

10. The telescopic adjustable inner form for construction of prestressed concrete cable-stayed bridge according to claim 9, characterized in that, The preparation method of the annular belt comprises the following steps: 1) winding a strip-shaped rubber sheet on the driving roller and the driven roller at room temperature, and bonding the joint of the strip-shaped rubber sheet to form the inner wear-resistant rubber layer of the annular belt; 2) the carbon fiber rope is pulled by a tensioner, and the leading end of the carbon fiber rope is fixed on one end in the width direction of the inner wear-resistant rubber layer; the driving roller is rotated to make the carbon fiber rope spirally wound on the annular surface of the inner wear-resistant rubber layer from one end to the other end in the width direction of the inner wear-resistant rubber layer, the initial section of the spirally wound carbon fiber rope is accelerated winding, the middle section is uniform speed winding, and finally the last section is decelerated winding until the winding speed is zero, and finally the intermediate skeleton layer is formed; a strip-shaped rubber sheet is attached to the intermediate skeleton layer, and the joint of the strip-shaped rubber sheet is bonded to form the outer wear-resistant rubber layer of the annular belt; 3) vulcanize the whole of the inner wear-resistant rubber layer, the intermediate skeleton layer and the outer wear-resistant rubber layer, the vulcanization temperature is 155-160℃, the vulcanization time is 30-40min, the surface pressure is 16-28MPa, and an annular belt is formed.

Images