Large-section internal steel and external concrete formwork structure

Abstract

The utility model discloses a large-section inner steel and outer concrete formwork structure which comprises a framework, a supporting assembly and a base, the framework is formed by splicing a plurality of formwork modules in the axial direction, the two side faces of each formwork module are a first combined section and a second combined section respectively, positioning columns distributed at equal intervals are arranged on the first combined section, and the second combined section is provided with a plurality of positioning columns distributed at equal intervals. A positioning groove matched with the positioning column is formed in the second combined section, and the splicing plane of the first combined section and the second combined section is perpendicular to the central axis of the framework. The utility model has the beneficial effects that the technical scheme is strong in structural stability, the circular supporting ring and the arc-shaped supporting groove are tightly attached, and the flange plate and the bolt are combined for fixation, so that the deformation resistance is obviously improved, and the device is suitable for large-section concrete pouring; modularized construction is efficient, formwork erecting modules are designed in a standardized mode, rapid and accurate splicing is achieved through positioning columns and positioning grooves, and the construction period is shortened.

Description

A large-section internal steel and external concrete formwork structure Technical Field

[0001] This utility model relates to the field of building engineering technology, and in particular to a large-section internal steel and external concrete formwork structure. Background Technology

[0002] In construction engineering, the formwork system for large-section concrete structures is a crucial element in ensuring construction quality and safety. Traditional internal steel and external concrete formwork structures typically employ a combination of a split steel frame and external formwork, but this approach presents the following problems in practical applications:

[0003] Insufficient structural stability: Traditional support components are mostly composed of split, curved steel plates connected by simple bolts. During concrete pouring, they are prone to deformation due to lateral pressure, leading to formwork displacement or joint cracking. Especially in large-section structures, the splicing points of split support rings easily become weak points, unable to withstand dynamic loads, posing safety hazards. The fixing methods between the base and the frame mostly rely on ordinary bolts or welding, lacking effective shear limiting design. After long-term use, the entire structure is prone to displacement due to foundation settlement or vibration.

[0004] Modular assembly is inefficient: the splicing of existing formwork modules often relies on manual adjustment and positioning, lacking standardized interface design, resulting in insufficient assembly precision. Misalignment between modules can cause the support grooves to stagger, affecting the continuity of the support rings and weakening the overall rigidity. The fit clearance between the support grooves and support rings is not strictly controlled, making them prone to loosening due to thermal expansion and contraction or construction vibration, requiring frequent maintenance and adjustment, increasing construction costs.

[0005] Poor durability and adaptability: Steel support rings are prone to corrosion when exposed to humid environments for extended periods. Traditional rust prevention measures (such as ordinary paint) have short lifespans, requiring regular refurbishment and increasing maintenance burden. The lack of drainage design in the base allows water to seep into the limiting groove, accelerating corrosion of metal components and shortening the structure's lifespan. Furthermore, traditional formwork systems struggle to adapt to minor foundation deformations, necessitating additional reinforcement measures and increasing construction complexity.

[0006] To address the aforementioned issues, existing technologies attempt to increase rigidity by increasing the thickness of the support ring or employing welding reinforcement, but this results in a bulky structure and reduced construction efficiency. Some improved solutions introduce modular design, but core issues such as precise positioning and dynamic load adaptability remain unresolved. Therefore, there is an urgent need for a large-section internal steel-concrete external formwork structure that combines high stability, easy assembly, and long service life to meet the dual demands of modern large-scale engineering projects for both construction efficiency and safety. Summary of the Invention

[0007] The main technical problem solved by this utility model is to provide a large-section internal steel and external concrete formwork structure, thereby solving one or more of the above-mentioned prior art problems.

[0008] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a large-section internal steel and external concrete formwork structure, the innovation of which lies in: including

[0009] The skeleton is composed of multiple formwork modules spliced ​​together along the axial direction. The two sides of each formwork module are a first combined section and a second combined section, respectively. The first combined section is provided with positioning columns distributed at equal intervals, and the second combined section is provided with positioning grooves that match the positioning columns. The splicing plane of the first combined section and the second combined section is perpendicular to the central axis of the skeleton.

[0010] The support assembly includes a support ring with a circular cross-section. The outer wall of the formwork module is provided with a support groove with an arc-shaped cross-section along the circumference. After all the formwork modules are assembled, the support grooves enclose to form a continuous ring track. The support ring is embedded in the ring track, and its cross-section is closely fitted with the arc-shaped cross-section of the support groove. The two ends of the support ring are connected by flanges. The flanges are provided with bolt holes and are fixed by high-strength bolts.

[0011] The base has a limiting groove on its top surface that matches the shape of the bottom of the frame. Shear keys are pre-embedded in the limiting groove, and the bottom of the frame is fixed to the base by the shear keys.

[0012] In some embodiments, the support ring is made of seamless steel pipe with an anti-rust coating on its outer surface and lightweight high-strength concrete filling the inner wall to enhance its compressive strength.

[0013] In some embodiments, the radius of the arcuate section of the support groove is 1.05-1.1 times the radius of the support ring section, and an elastic rubber gasket is filled between the support ring and the support groove to eliminate assembly gaps.

[0014] In some embodiments, the bolt holes of the flange are evenly distributed along the circumference, and reinforcing ribs are provided between adjacent bolt holes. The flange is welded and fixed to the support ring.

[0015] In some embodiments, the inner wall of the formwork module is provided with radial reinforcing ribs, one end of which is connected to the central axis of the skeleton, and the other end extends to the edge of the support groove, with the thickness of the reinforcing ribs increasing radially.

[0016] In some embodiments, the bottom of the limiting groove of the base is provided with a drainage hole, and a one-way valve is installed in the drainage hole to prevent external water from seeping into the limiting groove.

[0017] In some embodiments, the flange connection of the support ring is covered with an annular protective cover made of stainless steel and fixed to the flange by clips for dust and corrosion protection.

[0018] The beneficial effects of this utility model are: the structure of this technical solution is highly stable, the tight fit design of the circular support ring and the arc support groove, combined with the flange bolt fixing, significantly improves the resistance to deformation and is suitable for large cross-section concrete pouring; modular construction is efficient, the standardized design of the formwork module, and the positioning column and positioning groove can be quickly and accurately spliced, shortening the construction period. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0020] Figure 1 is a schematic diagram of a large-section internal steel and external concrete formwork structure according to this utility model.

[0021] Figure 2 is the first axial view of the formwork module of a large-section inner steel and outer concrete formwork structure of this utility model.

[0022] Figure 3 is the second axial view of the formwork module of a large-section inner steel and outer concrete formwork structure of this utility model.

[0023] Figure 4 is a front view of a formwork module of a large-section inner steel and outer concrete formwork structure according to this utility model.

[0024] Figure 5 is a cross-sectional view of Figure 4. Detailed Implementation

[0025] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] As shown in Figures 1 to 5, the embodiments of this utility model include:

[0027] I. Structural Composition and Component Description

[0028] 1. Frame 100 structure

[0029] Formwork Module 101:

[0030] Structure: Each support module 101 is a cuboid, made of high-strength aluminum alloy, and hollow inside to reduce weight; the two sides of the module are the first combined section 102 and the second combined section 103, which are parallel and perpendicular to the central axis of the frame 100; the first combined section 102 is provided with cylindrical positioning posts 104 (diameter 15mm, height 20mm) evenly distributed, and the second combined section 103 is provided with conical positioning grooves 105 (entrance diameter 16mm, bottom diameter 15mm, depth 20mm) that match the positioning posts 104.

[0031] Function: By interlocking the positioning post 104 with the positioning groove 105, precise axial splicing between modules is achieved, ensuring the overall straightness and perpendicularity of the skeleton 100.

[0032] Support groove 106:

[0033] Structure: The outer wall of the formwork module 101 is provided with a support groove 106 with an arc-shaped cross section (cross section radius of 50mm and depth of 10mm) along the circumference; after all the formwork modules 101 are assembled, the support grooves 106 enclose to form a continuous ring track.

[0034] Function: Used to embed the support ring 201 to provide uniform radial support force.

[0035] 2. Support components

[0036] Support ring 201:

[0037] Structure: The support ring 201 is a seamless steel pipe (outer diameter 100mm, wall thickness 8mm) with a circular cross-section. The outer surface is coated with an anti-rust epoxy coating, and the inner cavity is filled with lightweight high-strength concrete (strength grade C40). Flanges 202 (thickness 12mm, diameter 120mm) are welded to both ends of the support ring 201. Eight bolt holes (diameter 12mm) are evenly distributed around the circumference of the flange 202, and triangular reinforcing ribs (height 10mm) are welded between the holes.

[0038] Function: The circular cross-section provides uniform compressive strength, the internal concrete filling enhances compressive strength, and the 202 flange connection ensures the integrity of the ring.

[0039] Elastic rubber gasket:

[0040] Structure: The gasket is annular (52.5 mm cross-sectional radius, 3 mm thickness), embedded between the support groove 106 and the support ring 201, and is made of weather-resistant neoprene rubber.

[0041] Function: Eliminate assembly gaps, buffer vibration loads, and prevent metal-to-metal contact wear.

[0042] 3. Base 300 structure

[0043] Limiting groove:

[0044] Structure: The base 300 is a reinforced concrete casting. A U-shaped limiting groove (50mm deep and 200mm wide) matching the bottom contour of the frame 100 is opened on the top surface. Shear keys (material Q355 steel, size 50mm×50mm×100mm) are pre-embedded in the groove.

[0045] Function: By engaging with the bottom of the skeleton 100 via shear keys, the horizontal displacement of the skeleton 100 is restricted, ensuring overall stability.

[0046] Drain hole 301 and protective cover:

[0047] Structure: A drain hole 301 (20mm in diameter) is opened at the bottom of the limiting groove, and a one-way valve (PVC material) is installed in the hole; the flange 202 connection is covered with a stainless steel annular protective cover (1mm thick), which is fixed to the edge of the flange 202 by a buckle.

[0048] Function: Drain hole 301 drains accumulated water, and the protective cover prevents dust from entering and bolt 203 from corroding.

[0049] 4. Other auxiliary structures

[0050] Radial reinforcing ribs 107:

[0051] Structure: The inner wall of the formwork module 101 is provided with radial reinforcing ribs 107 (thickness increases from 5mm to 15mm). One end of the rib is connected to the central axis of the skeleton 100, and the other end extends to the edge of the support groove 106 and is welded and fixed to the inner wall of the module.

[0052] Function: Optimizes stress distribution and enhances the module's bending resistance.

[0053] Adjustable clamping device:

[0054] Structure: The base 300 limiting groove is symmetrically equipped with screw tightening devices (screw diameter 20mm, stroke 50mm), and the screw end is welded with a rubber gasket (thickness 10mm).

[0055] Function: Adjust the level of the frame 100 by rotating the screw; rubber pads prevent rigid contact damage to the frame 100.

[0056] II. Working Principle

[0057] Modular assembly:

[0058] The formwork module 101 is connected to the positioning groove 105 through the positioning column 104 and is spliced ​​into the skeleton 100 segment by segment along the axial direction. The splicing plane is perpendicular to the central axis to ensure the straightness of the structure.

[0059] The support ring 201 is segmented and embedded in the annular track formed by the support groove 106, and is connected into a whole by the flange 202 and bolts 203, with elastic rubber gaskets filling the gaps.

[0060] Load transfer path:

[0061] During concrete pouring, lateral pressure is transmitted to the support ring 201 through the formwork module 101. The support ring 201 uses the uniform compressive strength of the circular cross section to distribute the load, and the internal concrete filling further resists compressive deformation.

[0062] The shear key of the base 300 restricts the horizontal displacement of the frame 100, and the clamping device adjusts the verticality of the frame 100 to ensure that the load is evenly transferred to the foundation.

[0063] Dynamic adaptability:

[0064] The elastic rubber gasket absorbs construction vibrations and prevents hard collisions between the support ring 201 and the support groove 106; the radial reinforcing ribs 107, through a thickness gradient design, diffuse stress from the center to the edge, avoiding local stress concentration.

[0065] III. Summary of Advantages

[0066] High structural stability:

[0067] The tight fit between the circular support ring 201 and the arc-shaped support groove 106, combined with the flange 202 and bolts 203 for fixing, significantly improves the resistance to deformation and is suitable for large-section concrete pouring.

[0068] Modular construction is highly efficient: The standardized design of the formwork module 101 and the positioning column 104 and positioning groove 105 enable rapid and precise splicing, shortening the construction period.

[0069] Excellent durability: The support ring 201 is filled with lightweight, high-strength concrete, combining lightweight and high strength; the anti-rust coating and protective cover design extend service life.

[0070] Adaptable to complex environments: Drainage hole 301 and one-way valve prevent water accumulation from corroding base 300; elastic rubber gasket and adjustable clamping device adapt to slight deformation of the foundation.

[0071] Economy and safety: Modular components are reusable, reducing construction costs; radial reinforcing ribs 107 and shear key design ensure structural safety and avoid construction accidents.

[0072] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A large-section internal steel and external concrete formwork structure, characterized in that: The system includes a frame (100) composed of multiple formwork modules (101) spliced ​​axially. Each formwork module (101) has a first combined section (102) and a second combined section (103) on its two sides. The first combined section (102) is provided with equally spaced positioning posts (104), and the second combined section (103) is provided with positioning grooves (105) that match the positioning posts (104). The splicing plane of the first combined section (102) and the second combined section (103) is perpendicular to the central axis of the frame (100). The support assembly includes a support ring (201) with a circular cross-section. The outer side wall of the formwork module (101) A support groove (106) with an arc-shaped cross section is provided along the circumference. After all the support modules (101) are assembled, the support groove (106) surrounds and forms a continuous ring track. The support ring (201) is embedded in the ring track, and its cross section is closely fitted with the arc-shaped cross section of the support groove (106). The two ends of the support ring (201) are connected by a flange (202). The flange (202) is provided with bolt (203) holes and is fixed by high-strength bolts (203). The base (300) has a limiting groove on its top surface that matches the shape of the bottom of the skeleton (100). Shear keys are pre-embedded in the limiting groove. The bottom of the skeleton (100) is fixed to the base (300) by the shear keys.

2. The large-section internal steel and external concrete formwork structure according to claim 1, characterized in that: The support ring (201) is made of seamless steel pipe, with an anti-rust coating on its outer surface and lightweight high-strength concrete filling the inner wall to enhance its compressive strength.

3. The large-section internal steel and external concrete formwork structure according to claim 1, characterized in that: The radius of the arc-shaped cross section of the support groove (106) is 1.05-1.1 times the radius of the cross section of the support ring (201). An elastic rubber gasket is filled between the support ring (201) and the support groove (106) to eliminate assembly gaps.

4. The large-section internal steel and external concrete formwork structure according to claim 1, characterized in that: The bolt (203) holes of the flange (202) are evenly distributed along the circumference, and reinforcing ribs are provided between adjacent bolt (203) holes. The flange (202) is welded and fixed to the support ring (201).

5. A large-section internal steel-concrete external formwork structure according to claim 1, characterized in that: The inner wall of the support module (101) is provided with radial reinforcing ribs (107). One end of the reinforcing rib (107) is connected to the central axis of the skeleton (100), and the other end extends to the edge of the support groove (106). The thickness of the reinforcing rib (107) increases radially.

6. A large-section internal steel-concrete external formwork structure according to claim 1, characterized in that: The bottom of the limiting groove of the base (300) is provided with a drain hole (301), and a one-way valve is installed in the drain hole (301) to prevent external water from seeping into the limiting groove.

7. A large-section internal steel-concrete external formwork structure according to claim 1, characterized in that: The flange (202) connection of the support ring (201) is covered with an annular protective cover. The protective cover is made of stainless steel and is fixed to the flange (202) by buckles for dust and corrosion protection.

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