Formwork system of special-shaped large-section annular prestressed concrete structural beam

Abstract

The utility model relates to a formwork system of a special-shaped large-section annular prestressed concrete structural beam. Comprising a bottom supporting platform, an operation frame arranged on the bottom supporting platform, and a bottom die, an inner side die and an outer side die which are respectively arranged on the bottom supporting platform and the operation frame, the bottom supporting platform comprises main keels and auxiliary keels which are laid in a crossed mode, and steel springboards laid on the main keels and the auxiliary keels. The operation frames are fixedly arranged on the steel springboard, sealing plates are arranged on the end faces of the operation frames, the operation frames are arranged along the inner side and the outer side of a to-be-poured beam, an inner side mold and an outer side mold used for pouring the beam are laid on the operation frames on the two sides respectively, and the inner side mold, the outer side mold and the bottom mold are matched to form a concrete formwork used for pouring the beam. According to the formwork system, the problem of horizontal component force resistance of the formwork system is solved, and the problem of formwork deformation of a large-section ring beam can be solved without a split bolt.

Description

Technical Field

[0001] The utility model relates to the technical field of the construction of concrete structures, in particular to the construction technology of a special-shaped large-section annular prestressed concrete structure beam, and specifically to a formwork system for a special-shaped large-section annular prestressed concrete structure beam. Background Technique

[0002] A large sports stadium, which features an earth-covered structure and is mainly built in the form of reinforced concrete. Among them, there is a ring beam as the key load-bearing structure of the whole building that "connects the upper and lower". The main characteristics of this ring beam are that its plane projection is in a ring shape, and its cross-sectional projection is a parallelogram with arc curves on both sides.

[0003] According to the design plan, the above-mentioned special-shaped large-section ring beam is divided into several segments for synchronous construction. The length of each construction segment is, and the cross-sectional size is 6.3*, and the total weight of a single end is about 730 tons. For each construction segment, the common problems are that the outer surface is irregular, the size is large, and the weight is large. When using conventional scaffolding and formwork assembly for construction, there will inevitably be problems such as insufficient formwork support, which is prone to formwork displacement and bulging. At the same time, if a "contour-following" formwork system is not adopted, it will inevitably cause relatively large waste of raw materials. Content of the Utility Model

[0004] The present invention proposes a segmented and contour-following steel-wood hybrid formwork system, which is convenient for synchronous construction, has a small floor area, and good support effect. It solves the problem of the formwork system resisting horizontal component forces, enabling the large-section ring beam to solve the problem of formwork deformation without tie bolts.

[0005] In order to achieve the above purpose, the utility model is implemented as follows:

[0006] A formwork system for a special-shaped large-section annular prestressed concrete structure beam, including a bottom support platform, an operation frame arranged on the bottom support platform, and a bottom formwork, an inner formwork, and an outer formwork respectively arranged on the bottom support platform and the operation frame; the bottom support platform includes main keels and secondary keels laid crosswise, and steel gangplanks laid on the main keels and secondary keels; the operation frame is fixedly arranged on the steel gangplanks and a sealing plate is arranged at its end face. The operation frame is arranged along the inner and outer sides of the beam to be poured, and the inner formwork and the outer formwork for pouring the beam are respectively laid on the operation frames on both sides. The inner formwork, the outer formwork and the bottom formwork cooperate to form a concrete formwork for pouring the beam.

[0007] In the formwork system for the special-shaped large-section annular prestressed concrete structure beam, the operation frame is in a truss structure and a cross brace is arranged on its back. Connection seats are arranged on the front of the operation frame, and the connection seats are used to connect with the inner formwork or the outer formwork.

[0008] For the formwork system of the special-shaped large cross-section circular prestressed concrete structural beam, the inner formwork and the outer formwork refer to ribbed steel formwork, which includes the backing ribs or rib plates arranged according to the side shape of the beam to be cast and the steel formwork laid on the backing ribs or rib plates.

[0009] For the formwork system of the special-shaped large cross-section circular prestressed concrete structural beam, a disc buckle scaffold is arranged outside the operation frame, and the disc buckle scaffold is connected to the operation frame through bolts and connecting rods.

[0010] For the formwork system of the special-shaped large cross-section circular prestressed concrete structural beam, there are multiple bottom support platforms, and each bottom support platform is arranged in a fan shape. The space between the operation frames of adjacent bottom support platforms serves as a post-cast strip structure and is connected by struts, and the struts are arranged on the end sealing plates of adjacent operation frames.

[0011] This formwork system solves the problem of the formwork system resisting the horizontal component force, enabling the large cross-section ring beam to solve the problem of formwork deformation without the use of tie bolts. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the use state of the formwork system proposed by the present utility model Figure 1 。

[0013] Figure 2 Schematic diagram of the use state of the formwork system proposed by the present utility model Figure 2 。

[0014] Figure 3 Schematic diagram of the use state of the formwork system proposed by the present utility model Figure 3 。

[0015] Figure 4 Schematic diagram of the structure between the operation frame and the side formwork in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] Next, the technical solutions of the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection claimed by the present application.

[0017] As Figures 1 to 4, a formwork system for a special-shaped large cross-section circular prestressed concrete structural beam, comprising a bottom support platform 1, an operation frame 2 arranged on the bottom support platform 1, and a bottom form 3, an inner form 4, and an outer form 5 respectively arranged on the bottom support platform 1 and the operation frame 2; the bottom 1 support platform includes main keels and secondary keels laid crosswise, and steel jump boards 6 laid on the main keels and secondary keels; the operation frame 2 is fixedly arranged on the steel jump boards 6 and a sealing plate 7 is arranged at its end face, the operation frame 2 is arranged along the inner and outer sides of the beam to be poured, and the inner form 4 and the outer form 5 for pouring the beam are respectively laid on the operation frames 2 on both sides, and the inner form 4 and the outer form 5 cooperate with the bottom form 3 to form a concrete form for pouring the beam.

[0018] For the formwork system of the special-shaped large cross-section circular prestressed concrete structural beam, the operation frame 2 is in a truss structure or a disk buckle frame structure and a cross brace is arranged at the back, and a connecting seat is arranged on the front of the operation frame 2, and the connecting seat is used for connecting with the inner form 4 or the outer form 5.

[0019] For the formwork system of the special-shaped large cross-section circular prestressed concrete structural beam, the inner form 4 and the outer form 5 refer to ribbed steel formwork, which includes back ribs or rib plates arranged according to the side shape of the beam to be poured and steel formwork laid on the back ribs or rib plates.

[0020] For the formwork system of the special-shaped large cross-section circular prestressed concrete structural beam, a disk buckle scaffold is arranged on the outside of the operation frame 2, and the disk buckle scaffold is connected with the operation frame through bolts and connecting rods.

[0021] For the formwork system of the special-shaped large cross-section circular prestressed concrete structural beam, there are multiple bottom support platforms 1, each bottom support platform is arranged in a fan shape, and the space between the operation frames of adjacent bottom support platforms is used as a post-cast strip structure and is connected by a bracing rod 8, and the bracing rod 8 is arranged on the end sealing plate 7 of adjacent operation frames.

[0022] For the above formwork system of the special-shaped large cross-section circular prestressed concrete structural beam, in its specific implementation, it can be realized in the following ways:

[0023] 1. The bottom form adopts steel plates + keels (100×100×6×10 I-beams) and is assembled in a fan shape;

[0024] 2. The inner form adopts ribbed steel formwork, and the support and reinforcement of the inner form are realized by a truss, and the steel formwork and the truss are assembled by bolts;

[0025] 3. The outer form also adopts ribbed steel formwork, and the support and reinforcement of the outer form are also realized by a truss, and the steel formwork and the truss are assembled by bolts and a prestressed tensioning section is set at the same time;

[0026] 4. The operating frame is set on both sides of the ring beam and is erected using a disc-type scaffolding. The rod dimensions are horizontal distance, vertical distance, and step distance;

[0027] 5. Due to design reasons, the entire large ring beam is divided into twelve sections, so a wide post-cast strip is set between each construction section. Due to the large cross-sectional size of the ring beam and the dense internal steel bars, it is difficult to support the formwork. Considering the large cross-sectional size of the ring beam and the large number of longitudinal steel bars, it is difficult to temporarily seal the post-cast strip formwork; it is proposed to use wire mesh as the formwork in the outer ring main reinforcement area with the main reinforcement running through the beam and the middle longitudinal steel bars. The main reinforcement can directly pass through the wire mesh, and the internal area uses steel formwork. The straight threaded sleeve is connected to the end of the internal steel bar, and the post-cast strip steel bar is integrally connected to the large ring beam steel bar through the straight threaded sleeve;

[0028] 6. For the above formwork system, the bottom formwork and the inner side formwork are not considered for turnover; the outer side formwork is equipped with 4 construction section fixed steel formworks; the main ribs are welded with the panels and transverse ribs, and the welded short-circuited 20# channel steel is connected to the supporting truss with M20 bolts;

[0029] 7. The inner formwork support truss does not consider turnover; the outer formwork support truss is equipped with 4 construction sections of support trusses, and the support trusses are bolted to the I-beam platform;

[0030] 8. The construction walkway is connected to the supporting truss with bolts. The inner mold does not rotate, and the outer mold is equipped with 4 sets of fixed construction walkways.

[0031] As in the above-mentioned embodiment, the ring beam involved in the utility model is a single-sided curved surface on the inner side, and the cross section is a parallelogram. It is difficult to meet the requirements with ordinary wooden molds and the scaffolding and other support forms are huge. Therefore, the utility model customizes the steel template according to the structural shape, solves the problem of the special-shaped template required for the special-shaped surface of the ring beam, and fits the shape of the ring beam. At the same time, the total weight of a single section of the ring beam is 730 tons, which requires sufficient strength support. Therefore, the bottom mold uses a steel plate combined with an I-beam keel; therefore, the side mold uses a ribbed steel template and is reinforced with truss support to ensure that the template has sufficient strength and does not deform; at the same time, it also ensures the quality of concrete casting and construction progress.

[0032] The above are only embodiments provided for the present application and are not intended to limit the present application. Although the present application is described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A formwork system for annular prestressed concrete structural beams with special shapes and large cross-sections, characterized by: It includes a bottom supporting platform, an operating frame arranged on the bottom supporting platform, and a bottom formwork, an inner formwork, and an outer formwork respectively arranged on the bottom supporting platform and the operating frame; the bottom supporting platform includes a main keel and a secondary keel laid crosswise, and a steel springboard laid on the main keel and the secondary keel; the operating frame is fixedly arranged on the steel springboard and a sealing plate is arranged on its end surface, the operating frame is arranged along the inner and outer sides of the beam to be cast, and the inner formwork and the outer formwork for casting the beam are respectively laid on the operating frames on both sides, and the inner formwork, the outer formwork and the bottom formwork cooperate to form a concrete formwork for casting the beam.

2. The formwork system for the special-shaped large-section annular prestressed concrete structural beam according to claim 1 is characterized by: The operating frame is in a truss structure and a scissor brace is arranged on the back. A connecting seat is arranged on the front of the operating frame, and the connecting seat is used to connect with the inner mold or the outer mold.

3. The formwork system for the special-shaped large-section annular prestressed concrete structural beam according to claim 1 or 2 is characterized in that: The inner formwork and the outer formwork refer to ribbed steel formworks, which include back ribs or ribs arranged according to the side shape of the beam to be cast and steel formworks laid on the back ribs or ribs.

4. The formwork system for the special-shaped large-section annular prestressed concrete structural beam according to claim 1 or 2, characterized in that: A disc-type scaffold is arranged on the outer side of the operating frame, and the disc-type scaffold is connected to the operating frame through bolts and connecting rods.

5. The formwork system for the special-shaped large-section annular prestressed concrete structural beam according to claim 1 or 2, characterized in that: There are multiple bottom support platforms, each of which is arranged in a fan shape. The operating frames of adjacent bottom support platforms serve as post-casting strip structures and are connected by supporting rods, which are arranged on the end sealing plates of adjacent operating frames.

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