Prestressed concrete cover beam end formwork

Abstract

The utility model discloses a prestressed concrete cover beam end formwork which comprises an end formwork body, a protruding plate face plate is positioned at the bottom of the inner side of the end formwork body, a prestressing tendon hole and an anchor bearing plate bolt hole are formed in the protruding plate face plate, and the anchor bearing plate bolt hole is located on the outer ring of the prestressing tendon hole. Three groups of anchor bearing plate bolt holes are formed in the outer ring of each group of prestressing tendon holes, and a first stiffening rib is integrally positioned between the convex plate panel and the end template body. According to the prestressed concrete cover beam end formwork, one-time installation and forming of the anchor bearing plate are achieved, installation and positioning of the anchor bearing plate are accurate, the technical problems that installation and positioning of the anchor bearing plate are not accurate, not firm and not tight are solved, the concrete pouring quality of the cover beam end is ensured, and the safety quality requirement for prestress tensioning is met; and the end template is quickly mounted and dismounted, so that the construction time of the end of the capping beam is greatly shortened and the cost is saved.

Description

Technical Field

[0001] The utility model relates to the technical field of cap beam end formwork, in particular to a prestressed concrete cap beam end formwork. Background Art

[0002] The cap beam end formwork is a supporting equipment for cap beam processing. The cap beam is one of the most important load-bearing components in the entire bridge substructure. The control of its construction quality directly affects the service life of the entire bridge. How to improve the construction quality of the cap beam, especially the construction quality of the prestressed tendons, has always been a major problem that has plagued construction. With the continuous development of science and technology, people have higher and higher requirements for the manufacturing process of the cap beam end formwork.

[0003] The existing cap beam end template has certain drawbacks when used. The traditional cap beam construction uses an integral fixed template formed by combining the cap beam end template and the prestressed beam hole template. In actual construction, after determining the position of the prestressed beam hole template on the cap beam end template and the angle of the plane where the hole template is located according to the layout position of the prestressed beam running through the cap beam and the linear problem of the prestressed beam, the prestressed beam hole template and the cap beam end template are welded to form an integral template for subsequent concrete pouring operations. In traditional end construction, the installation of the anchor plate and the end template is complicated, and the installation quality is not easy to guarantee. It is easy to have loose and loose installation. When pouring the end concrete, it is easy to cause the anchor plate to deviate, the concrete at the anchor plate is not dense, the slurry leaks, and the strength is insufficient. In the later tensioning, concrete cracking, grouting leakage, and loose slurry occur. After the concrete pouring is completed, it is difficult to remove the end template, and the removal cycle is long. In the process of removal, it is very easy to cause damage to the concrete entity and the template, which seriously affects the quality and progress of the project. This requires engineers to improve and apply the current cap beam end formwork, reduce the difficulties in the construction process of the cap beam end and prestressed beam holes, and ensure the quality of cap beam construction. To this end, we propose a prestressed concrete cap beam end formwork. Utility Model Content

[0004] The purpose of the utility model is to provide a prestressed concrete cap beam end template, which can realize one-time installation and molding of the anchor plate, and the installation and positioning of the anchor plate are accurate, which solves the technical difficulties of inaccurate, loose and loose installation and positioning of the anchor plate, ensures the quality of concrete pouring at the end of the cap beam, and guarantees the safety and quality requirements of prestressed tensioning. The rapid installation and disassembly of the end template can greatly shorten the construction time of the cap beam end, save costs, and can effectively solve the problems in the background technology.

[0005] The utility model is realized by the following technical solutions:

[0006] A prestressed concrete capping beam end formwork, including an end formwork body, a convex panel is positioned at the bottom inside the end formwork body, prestressed tendon holes and anchor plate bolt holes are opened on the convex panel, the anchor plate bolt holes are located on the outer ring of the prestressed tendon holes, and three groups of anchor plate bolt holes are arranged on the outer ring of each group of prestressed tendon holes. A first stiffening rib is integrally positioned between the convex panel and the end formwork body. An anchor plate contact plate is integrally positioned at the bottom of the convex panel, and an anchor plate installation operation hole is opened on the anchor plate contact plate.

[0007] Further as an improvement of the technical solution of the present invention, an edge wing plate is integrally positioned on the outer ring of the end formwork body, a water discharge trough formwork is integrally positioned in the middle of the front end of the end formwork body, two groups of I-beams are integrally positioned in the middle of the convex panel, a convex panel side plate is integrally positioned at the edge of the convex panel, an edge wing plate is integrally positioned at the edge of the end formwork body, wing plate bolt holes are opened on the edge wing plate, and a second stiffening rib is positioned between the edge wing plate and the convex panel.

[0008] Further as an improvement of the technical solution of the present invention, a convex panel thickening layer is integrally positioned on the surface of the convex panel, a convex panel inner reinforcing rib is integrally positioned on the inner surface of the edge wing plate, and a convex panel outer reinforcing rib is integrally positioned on the outer side of the edge wing plate.

[0009] Further as an improvement of the technical solution of the present invention, the end formwork body, the edge wing plate and the water discharge trough formwork are integrally formed by die casting, the convex panel and the I-beam are fixed by welding, the convex panel and the convex panel side plate are fixed by welding, and the surface of the edge wing plate is fixed through the wing plate bolt holes.

[0010] Further as an improvement of the technical solution of the present invention, the convex panel and the convex panel thickening layer are integrally formed by die casting, and the edge wing plate, the convex panel inner reinforcing rib and the convex panel outer reinforcing rib are fixed by welding.

[0011] Further as an improvement of the technical solution of the present invention, the end formwork body, the convex panel and the first stiffening rib are integrally formed by casting, and the anchor plate installation operation hole corresponds to the position of the prestressed tendon hole.

[0012] Compared with the prior art, the present invention provides a prestressed concrete capping beam end formwork, which has the following beneficial effects:

[0013] The end formwork of the prestressed concrete bent cap of the present utility model realizes the one-time installation and forming of the anchor backing plate, with accurate installation and positioning of the anchor backing plate, solving the technical difficulties of inaccurate, insecure, and non-tight installation and positioning of the anchor backing plate, ensuring the casting quality of the concrete at the end of the bent cap, guaranteeing the safety and quality requirements of prestressed tensioning. The rapid installation and removal of the end formwork can greatly shorten the construction time at the end of the bent cap, save costs, and the entire end formwork of the bent cap has a simple structure, convenient operation, and better use effect compared with the traditional method. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 FIG. is a schematic diagram of the overall structure of an end formwork of a prestressed concrete bent cap of the present utility model.

[0015] Figure 2 FIG. is a schematic diagram of the structure of the bottom view of an end formwork of a prestressed concrete bent cap of the present utility model.

[0016] Figure 3 FIG. is a schematic diagram of the structure of the front view of an end formwork of a prestressed concrete bent cap of the present utility model.

[0017] Figure 4 FIG. is a schematic diagram of the structure of the side view of an end formwork of a prestressed concrete bent cap of the present utility model.

[0018] In the figure: 1. End formwork body; 2. First stiffening rib; 3. Anchor backing plate bolt hole; 4. Edge wing plate; 5. Wing plate bolt hole; 6. Convex plate panel; 7. Convex plate side plate; 8. Water chute formwork; 9. Prestressed tendon hole; 10. I-beam; 11. Second stiffening rib; 12. Anchor backing plate installation operation hole; 13. Inner stiffening rib of convex plate; 14. Outer stiffening rib of convex plate; 15. Thickening layer of convex plate; 16. Anchor backing plate contact plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] It should be noted that all the directional indications (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0021] In the present utility model, unless otherwise clearly defined and limited, the term "connection" shall be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meaning of the above terms in the present utility model can be understood according to specific circumstances.

[0022] In addition, in the present utility model, descriptions such as "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one such feature; in addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0023] The following further elaborates and illustrates the present utility model in conjunction with specific embodiments and the accompanying drawings of the specification:

[0024] As Figures 1-4 shown, a prestressed concrete bent cap end formwork includes an end formwork body 1. At the bottom inside the end formwork body 1, a convex panel 6 is positioned. Prestressing tendon holes 9 and anchor plate bolt holes 3 are provided on the convex panel 6. The anchor plate bolt holes 3 are located on the outer circle of the prestressing tendon holes 9, and three groups of anchor plate bolt holes 3 are arranged on the outer circle of each group of prestressing tendon holes 9. A first stiffening rib 2 is integrally positioned between the convex panel 6 and the end formwork body 1. At the bottom of the convex panel 6, an anchor plate contact plate 16 is integrally positioned, and an anchor plate installation operation hole 12 is provided on the anchor plate contact plate 16.

[0025] Specifically, in the solution of this embodiment, an edge wing plate 4 is integrally positioned on the outer circle of the end formwork body 1. In the middle of the front end of the end formwork body 1, a water trough formwork 8 is integrally positioned. Two groups of I-beams 10 are integrally positioned in the middle of the convex panel 6. A convex panel side plate 7 is integrally positioned at the edge of the convex panel 6. An edge wing plate 4 is integrally positioned at the edge of the end formwork body 1. Wing plate bolt holes 5 are provided on the edge wing plate 4. A second stiffening rib 11 is positioned between the edge wing plate 4 and the convex panel 6.

[0026] Specifically, in the solution of this embodiment, a convex panel thickening layer 15 is integrally positioned on the surface of the convex panel 6. A convex panel inner strengthening rib 13 is integrally positioned on the inner surface of the edge wing plate 4, and a convex panel outer strengthening rib 14 is integrally positioned on the outer side of the edge wing plate 4.

[0027] Specifically, in the solution of this embodiment, the end template body 1, the edge wing plate 4 and the water trough template 8 are integrally formed by die-casting. The convex plate panel 6 and the I-beam 10 are fixed by welding. The convex plate panel 6 and the convex plate side plate 7 are fixed by welding. The surface of the edge wing plate 4 is fixed through the wing plate bolt holes 5.

[0028] Specifically, in the solution of this embodiment, the convex plate panel 6 and the convex plate thickening layer 15 are integrally formed by die-casting. The edge wing plate 4 is fixed to the convex plate inner reinforcing rib 13 and the convex plate outer reinforcing rib 14 by welding.

[0029] Specifically, in the solution of this embodiment, the end template body 1, the convex plate panel 6 and the first stiffening rib 2 are integrally formed by casting. The position of the anchor plate installation operation hole 12 corresponds to the prestressed tendon hole 9.

[0030] Working principle: The utility model includes an end template body 1, a first stiffening rib 2, an anchor plate bolt hole 3, an edge wing plate 4, a wing plate bolt hole 5, a convex plate panel 6, a convex plate side plate 7, a water trough template 8, a prestressed tendon hole 9, an I-beam 10, a second stiffening rib 11, an anchor plate installation operation hole 12, a convex plate inner reinforcing rib 13, a convex plate outer reinforcing rib 14, a convex plate thickening layer 15, and an anchor plate contact plate 16. Through BIM intelligent construction simulation installation, steel structure prestressed capping beam end template drawing deepening and component quality control, the internal and external structures of the prestressed capping beam end template are designed in advance. With the assistance of BIM technology, the refined construction of the prestressed capping beam end template is ensured, the anchor plate is formed in one installation, the installation and positioning of the anchor plate are accurate, the technical difficulties of inaccurate, insecure and unsealed installation and positioning of the anchor plate are solved, the quality of the capping beam end concrete pouring is ensured, the safety and quality requirements of prestressed tensioning are guaranteed. The rapid installation and disassembly of the end template can greatly shorten the construction time of the capping beam end, save costs. The design and application of this end template are safe, reliable, economical, efficient, with simple technology and strong operability.

[0031] Specifically, in the solution of this embodiment, it includes the entire construction application process of the production, installation, concrete pouring, tensioning, and grouting of the end template, and forms a complete set of construction technologies. The main contents include:

[0032] 1. Using BIM modeling technology, establish an end template model in advance

[0033] 2. According to the BIM model, process and manufacture the end template;

[0034] 3. Install the anchor plate and the end template;

[0035] 4. Pour concrete;

[0036] 5. Prestressed tensioning and grouting.

[0037] 1. Through BIM intelligent construction simulation of the construction process, the deepening of the end formwork of the steel structure prestressed bent cap and the quality control of components, the internal and external structures of the end formwork of the prestressed bent cap are designed in advance, and with the assistance of BIM technology, the refined construction of the end formwork of the prestressed bent cap is ensured.

[0038] 2. The end formwork is made by shaping and processing Q325A grade steel. The formwork is mainly welded by three major components: the convex plate, the end side formwork, and the edge wing plate. The reasonable structural form facilitates the removal of the end formwork, ensures the stiffness of the end formwork, and guarantees the stability of the formwork and the safety of construction.

[0039] 3. The convex plate surface is drilled according to the size, position, and quantity of the prestressed tendon holes. Holes are drilled symmetrically at intervals of 120° on the side of the prestressed tendon holes to form anchor plate bolt holes. Holes are drilled on the end side formwork to set the operation holes for installing the anchor plate. The quantity and position of the holes correspond one by one to the prestressed tendon holes. The diameter of the drilled holes is 10 cm larger than the diameter of the prestressed tendon holes. The formation of the anchor plate bolt holes and the operation holes for installing the anchor plate facilitates the one-time installation and forming of the anchor plate.

[0040] 4. All the anchor plates are installed on the end formwork in advance at one time. The end formwork is hoisted as a whole. The bolt holes of the edge wing plate and the side formwork of the bent cap are connected by M18 high-strength bolts, enabling rapid overall installation and achieving rapid closing of the end formwork; the end anchor plates can be installed and formed at one time, with accurate, firm, and tight positioning, ensuring the dense and flat pouring of the end concrete, and guaranteeing the safety and quality of the prestressed tensioning and grouting construction.

[0041] 5. After the concrete of the bent cap is poured and reaches the required strength, the anchor plate bolts and the edge wing plate bolts are disassembled, and the end formwork can be quickly removed as a whole. The removal process is simple and convenient, has basically no impact on the quality of the end concrete entity, and the end formwork can be reused repeatedly, saving costs and shortening the construction period.

[0042] Using BIM modeling technology, an end formwork model is established in advance

[0043] The end formwork is mainly composed of three major components: the convex plate, the end side formwork, and the edge wing plate. The prestressed anchor plate is installed on the convex plate at one time.

[0044] According to the BIM model, the end formwork is processed and fabricated.

[0045] The end formwork is processed using Q325A grade steel. According to the BIM model, the detailed drawings of each component are refined.

[0046] According to the BIM model and the detailed drawings, the convex plate, the end side formwork, and the edge wing plate are processed and fabricated respectively, and the three major components are welded into a whole.

[0047] The raised plate is composed of side plates and panel plates. The bottom of the side plates is offset inward by 3 cm to the top of the panel plates, so that the raised plate is trapezoidal in shape as a whole, which is convenient for the removal of the formwork. Holes are opened in the panel plates to form prestressed holes, and holes are opened symmetrically at intervals of 120° around the prestressed holes to form bolt holes for the anchor plate.

[0048] Longitudinal and transverse stiffening ribs are set on the back concrete surface of the end side formwork. The transverse stiffening ribs are welded to the edge wing plates, and two 16-type I-beams are welded between the longitudinal stiffening ribs to ensure the safety and reliability of the end side formwork. Holes are opened on the end side formwork to set anchor plate installation operation holes. The number and position of the holes correspond to the prestressed beam holes one by one. The hole diameter is 10 cm larger than the prestressed beam hole diameter to facilitate the installation of the anchor plate. To ensure the overall strength of the end formwork, stiffening ribs are welded between the convex plate panel and the end side formwork.

[0049] The edge wing plate is welded to the end side formwork, bolt holes are set in the wing plate openings, and M18 high-strength bolts are used to connect it to the cap beam side formwork to achieve overall rapid sealing of the cap beam formwork.

[0050] Terminal template installation

[0051] Anchor plate installation

[0052] Align the anchor plate with the reserved prestressed beam hole on the convex plate panel, and use bolts to install and fix the anchor plate to the end template through the three reserved bolt holes.

[0053] Terminal template installation

[0054] After the anchor plate is installed, it is hoisted as a whole and the end of the cap beam is sealed. The end template is connected and fixed with the cap beam template and the bottom template using M18 high-strength bolts through the reserved bolt holes on the edge wing plate to achieve the overall sealing of the cap beam template.

[0055] Concrete pouring

[0056] After the formwork is installed and accepted, the concrete is poured, and the concrete is maintained in time after pouring. When pouring concrete, pay special attention to the quality of the concrete pouring at the anchor pad at the end of the cap beam. If the anchor pad is divided into three layers, the concrete pouring must be divided into at least three layers, and the thickness of each layer must completely wrap the anchor pad to ensure that the concrete within the tensioning force range of the anchor pad is poured and formed at one time; the concrete is vibrated and compacted, and the concrete stops sinking, no longer bubbles, and the surface is flat and slurry is overflowing. The compactness and strength of the concrete within the tensioning force range of the anchor pad are ensured through pouring methods and vibration measures.

[0057] Formwork removal

[0058] After the concrete strength of the capping beam reaches 2.5 MPa, the lateral formwork of the capping beam can be removed. When removing the formwork, first loosen the bolts of the anchor plate and the end formwork, separate the anchor plate from the end formwork, and then remove the bolts of the end formwork and the lateral formwork to separate the end formwork from the lateral formwork, realizing the removal of all lateral formworks. The end formwork is removed integrally at one time. The removal process is simple and convenient, and has basically no impact on the quality of the end concrete entity. After the formwork is removed, the end concrete is flat and dense, and the appearance quality is good; the position of the anchor plate is fixed well, without deviation or deformation, and there is no leakage of slurry, honeycombing or pockmarking on the surrounding concrete, and the density is good.

[0059] Prestress tensioning

[0060] It can be carried out after the concrete strength of the capping beam reaches 90% of the designed strength value, the curing time is not less than 10 days, and the elastic modulus of the concrete is not less than 85% of the elastic modulus of C50 concrete. During tensioning, double control of the tensioning force and the elongation is adopted, with the tensioning force as the main control. The allowable error between the measured total elongation and the calculated total elongation should be controlled within 6%. Tertiary tensioning process (0 - 10%δ - 20%δ - 100%δ) is adopted for tensioning, and each stage of tensioning is stabilized for 2 minutes. Due to the flat surface of the end concrete, the concrete in the stress area of the anchor plate is dense and has high strength, so the tensioning process is safe and the tensioning quality is guaranteed.

[0061] Grouting

[0062] Concrete grouting should be completed within 48 hours after the concrete tensioning. Before grouting, the anchoring end is sealed with mortar, and the circulating grouting process is adopted for grouting. Since the anchor plate is bonded tightly with the surrounding concrete without gaps, there is no leakage of the grout during the grouting process, and the grouting quality is guaranteed.

[0063] The end formwork of the prestressed concrete capping beam of the present utility model realizes the one-time installation and forming of the anchor plate, and the installation and positioning of the anchor plate are accurate, solving the technical difficulties of inaccurate, insecure and non-tight installation and positioning of the anchor plate, ensuring the casting quality of the end concrete of the capping beam, guaranteeing the safety and quality requirements of prestress tensioning. The quick installation and removal of the end formwork can greatly shorten the construction time of the capping beam end, save costs, the entire end formwork structure of the capping beam is simple, easy to operate, and the use effect is better than the traditional method.

[0064] The technical solutions provided by the embodiments of the present utility model have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of the embodiments of the present utility model. The descriptions of the above embodiments are only applicable to help understand the principles of the embodiments of the present utility model; at the same time, for those of ordinary skill in the art, based on the embodiments of the present utility model, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A prestressed concrete cap beam end formwork, comprising an end formwork body (1), characterized in that: A convex plate panel (6) is positioned at the bottom of the inner side of the end formwork body (1), and a prestressed beam hole (9) and an anchor plate bolt hole (3) are provided on the convex plate panel (6). The anchor plate bolt holes (3) are located in the outer circle of the prestressed beam holes (9), and three groups of anchor plate bolt holes (3) are provided in the outer circle of each group of prestressed beam holes (9). A first stiffening rib (2) is integrally positioned between the convex plate panel (6) and the end formwork body (1), and an anchor plate touch plate (16) is integrally positioned at the bottom of the convex plate panel (6), and an anchor plate installation operation hole (12) is provided on the anchor plate touch plate (16).

2. The prestressed concrete cap beam end formwork according to claim 1, characterized in that: The outer ring of the end template body (1) is integrally positioned with an edge wing plate (4), the front end middle portion of the end template body (1) is integrally positioned with a gutter template (8), the upper middle portion of the convex plate panel (6) is integrally positioned with two groups of I-beams (10), the edge of the convex plate panel (6) is integrally positioned with a convex plate side plate (7), the edge of the end template body (1) is integrally positioned with an edge wing plate (4), the edge wing plate (4) is provided with a wing plate bolt hole (5), and a second stiffening rib (11) is positioned between the edge wing plate (4) and the convex plate panel (6).

3. The prestressed concrete cap beam end formwork according to claim 2, characterized in that: The surface of the convex plate panel (6) is integrally positioned with a convex plate thickening layer (15), the inner surface of the edge wing plate (4) is integrally positioned with a convex plate inner reinforcing rib (13), and the outer side of the edge wing plate (4) is integrally positioned with a convex plate outer reinforcing rib (14).

4. The prestressed concrete cap beam end formwork according to claim 2, characterized in that: The end template body (1) is integrally formed with the edge wing plate (4) and the gutter template (8) by die-casting, the convex plate panel (6) is fixed to the I-beam (10) by welding, the convex plate panel (6) is fixed to the convex plate side plate (7) by welding, and the surface of the edge wing plate (4) is fixed by the wing plate bolt hole (5).

5. The prestressed concrete cap beam end formwork according to claim 3, characterized in that: The convex plate panel (6) and the convex plate thickening layer (15) are integrally formed by die-casting, and the edge wing plate (4) and the convex plate inner reinforcement rib (13) and the convex plate outer reinforcement rib (14) are fixed by welding.

6. The prestressed concrete cap beam end formwork according to claim 1, characterized in that: The end formwork body (1), the convex plate panel (6) and the first stiffening rib (2) are integrally formed by casting, and the anchor plate installation operation hole (12) corresponds to the position of the prestressed bundle hole (9).

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