An exhaust curing device for a needle beam steel form trolley inverted arch part and a construction method

Abstract

The application discloses a kind of exhaust maintenance device and construction method for needle beam steel mould trolley inverted arch part, belong to tunnel and underground engineering construction equipment technical field;For the exhaust maintenance device of needle beam steel mould trolley inverted arch part, it includes: a plurality of holes opened on formwork panel;The hole is staggered arrangement according to interval, forms the exhaust drainage network covering entire easy gas collection area;It also includes: the hole mouth reinforcing ring corresponding to the periphery of hole, and the drainage exhaust plug that can be detached with hole cooperation.The application, constructs efficient exhaust drainage passage: by reasonably opening the hole array of specific shape on inverted arch formwork, form low-resistance exhaust drainage network, ensure that vibrating bubble or bleeding water can be discharged in time smoothly;Realize device integration: provide the pluggable plug body structure with the functions of exhaust, drainage, sealing and fixing, and set functional materials, can effectively discharge the escaped bubbles or bleeding water in vibrating process.

Description

Technical Field

[0001] This invention relates to the field of tunnel and underground engineering construction equipment technology, and in particular to an exhaust curing device and construction method for the invert arch section of a steel formwork trolley for needle beams. Background Technology

[0002] In tunnel concrete lining construction, poor ventilation and drainage in areas such as the invert arch can easily lead to quality defects. Because these areas are located in regions with gentle formwork slopes, air bubbles or bleed water generated during concrete vibration accumulate on the formwork surface due to buoyancy. However, due to the limited airtightness of traditional formwork, the gas and bleed water cannot find an effective path to escape.

[0003] Currently, although small holes or windows are occasionally left on the formwork during construction to attempt to ventilate and drain air, the following problems exist due to the lack of systematic design: 1) Low ventilation and drainage efficiency: The number of small holes or windows is limited, and the windows are not sealed tightly, making it impossible to form a systematic ventilation and drainage system; 2) Poor reliability: The holes are easily blocked by concrete slurry, the windows are not sealed tightly, and on-site operation is inconvenient; 3) Affecting the strength of the formwork: If too many windows are opened or too large, it will weaken the structural integrity of the steel formwork.

[0004] Therefore, there is an urgent need for an efficient, reusable active air venting and drainage system specifically designed for the invert arch. Summary of the Invention

[0005] The purpose of this invention is to solve the common technical problem in the prior art where poor venting or drainage leads to quality defects such as honeycomb pitting or blisters on the concrete surface. The invention proposes a venting and curing device and construction method for the invert arch section of the steel formwork trolley for needle beams, forming an integrated and modular active venting and drainage solution to fundamentally solve the venting problem of invert arch concrete.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A ventilation and maintenance device for the arch section of a steel formwork trolley for needle beams includes: a plurality of holes formed on the formwork panel; the holes are arranged at staggered intervals to form a ventilation and drainage network covering the entire area prone to air accumulation. Also includes: Corresponding to the reinforcing ring around the hole, And a removable drain and vent plug that fits into the hole.

[0007] In some embodiments, the hole is elongated; the width is 2 cm and the length is 20-30 cm.

[0008] In some embodiments, the size of the opening is determined based on fluid dynamics and structural mechanics calculations; this minimizes the weakening of the template panel by the opening while providing the most reliable venting and drainage.

[0009] In some embodiments, the holes are arranged alternately at intervals of 1.0 to 1.5 m.

[0010] In some embodiments, the inner annular surface of the hole is inclined, forming a structure where the hole is smaller when close to the concrete end and larger when far away from the concrete end.

[0011] In some embodiments, the orifice reinforcing ring is a steel ring made of the same material as the base material and welded together.

[0012] In some embodiments, the inner side of the orifice reinforcing ring is provided with a plurality of water-permeable holes extending outward.

[0013] In some embodiments, the drain and vent plug is structured to fit into the hole and inserted therein; The drain and vent plug has a rigid mesh skeleton structure, forming a fine drain and vent passage.

[0014] In some embodiments, the drain and vent plug is fixed by a positioning structure; The positioning structure includes: The wing plate that applies pressure to the drain and vent plug. And the fasteners that connect the wing plate to the orifice reinforcing ring.

[0015] In some embodiments, it further includes a functional membrane placed inside the hole and in direct contact with the concrete.

[0016] A method for venting and curing construction of the invert arch section of a steel formwork trolley for needle beams includes the following steps: S1. Preparation: Check and clean the holes on the template, and check that the drainage and vent plugs and functional membrane are intact; S2. Installation: Place the functional membrane in place, install the drainage and vent plugs, and fix it to the template using fasteners; S3. Pouring and Venting / Drainage: During concrete pouring and vibration, any escaping air bubbles or oozing water are discharged through the functional membrane and the mesh skeleton of the plug body under the action of vibration force. S4. Removal and Turnover: After the concrete has set, remove the drainage and vent plugs, clean the plug skeleton, replace the new functional membrane, and put it into the next cycle of use.

[0017] Compared with the prior art, the present invention provides an exhaust curing device and construction method for the inverted arch part of the steel formwork trolley of the needle beam, which has the following beneficial effects.

[0018] This invention constructs an efficient air venting and drainage channel: by rationally opening a specific shape array of holes on the invert arch template, a low-resistance air venting and drainage network is formed to ensure that vibration air bubbles or oozing water can be discharged smoothly and in a timely manner.

[0019] This invention achieves device integration: it provides a pluggable plug structure that integrates venting, drainage, sealing and fixing functions, and is equipped with functional materials that can effectively discharge air bubbles or oozing water that escapes during the vibration process.

[0020] This invention ensures reliable and convenient construction: the plug body must have precise positioning and alignment functions and quick locking functions to ensure that it remains stable and does not shift under the lateral pressure of concrete, and can be quickly installed and disassembled.

[0021] This invention ensures structural safety and repeatability: all opening designs are mechanically verified and do not affect the strength of the trolley's main structure; the core components of the device are robust, durable, and reusable, with only easily damaged functional parts requiring replacement.

[0022] Other advantages, objectives and features of the invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be learned from practice of the invention. Attached Figure Description

[0023] Figure 1 These are schematic diagrams and partially enlarged schematic diagrams of the present invention.

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention.

[0025] Figure 3 This is a schematic diagram of the explosion state of the present invention.

[0026] In the picture: 1. Hole; 2. Reinforcing ring at the orifice; 3. Drainage and vent plug; 4. Water-permeable hole; 5. Wing plate; 6. Fixture; 7. Functional membrane. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0028] Reference Figure 1-3 A ventilation and maintenance device for the invert arch of a steel formwork trolley for needle beams provides a systematic ventilation and drainage solution. For the invert arch, it abandons the passive and scattered ventilation approach and proposes an active and modular ventilation system consisting of "optimized perforated template + multi-functional integrated plug".

[0029] The exhaust and maintenance device for the inverted arch of the steel formwork trolley for needle beams includes: several holes 1 opened on the template panel; the holes 1 are arranged alternately at a certain interval (preferably 1.0~1.5m) to form an exhaust and drainage network covering the entire area prone to air accumulation.

[0030] It is important to note that the openings in the template need to be optimized and designed, rather than being made arbitrarily.

[0031] On the template panel of the arch area of ​​the steel mold trolley, systematic holes are made during template processing; and the hole 1 faces the area prone to air accumulation, rather than the entire area. Furthermore, the hole shape is preferably elongated, with dimensions of "20-30 cm in length and 2 cm in width".

[0032] This dimension is determined based on fluid mechanics and structural mechanics calculations, ensuring reliable venting and drainage while minimizing the weakening of the formwork panel's strength due to the openings. Of course, in practical applications, adaptive calculations and adjustments can be made based on the thickness, curvature, and dimensions of the invert arch formwork, combined with actual environmental parameters and fluid mechanics and structural mechanics principles.

[0033] Furthermore, the inner annular surface of hole 1 is sloping.

[0034] like Figure 2 As shown, a structure is formed where the small end hole is close to the concrete and the large end hole is far away from the concrete.

[0035] Therefore, it is possible to better maintain the concrete flow while meeting the drainage and venting requirements; and it is also better suited for the installation of other auxiliary structures (such as the drainage and venting plug 3 described later).

[0036] In some embodiments, it also includes: Corresponding to the reinforcing ring 2 around the perimeter of hole 1, And a removable drain and vent plug 3 that mates with hole 1.

[0037] Among them, the orifice reinforcing ring 2 is a steel ring made of the same material as the base material and welded together.

[0038] Specifically, on the inner side of the template (away from the concrete) at each opening location (hole 1), a reinforcing steel ring of the same material as the parent material is welded together around the opening; its shape matches the shape of the opening (around the elongated hole), its size is larger than the opening, and it forms a surrounding space on the inside.

[0039] Its functions are: a) Eliminating stress concentration: redistributing the stress at the edge of the opening to prevent fatigue cracking of the template under repeated loads; b) Increasing local stiffness: providing a stable foundation for the installation and locking of other structures (such as drainage and vent plugs 3); c) Protecting the opening: preventing wear or deformation of the template opening caused by repeated insertion and removal of drainage and vent plugs 3.

[0040] Correspondingly, the structure of the drain and vent plug 3 is matched with the hole 1 and inserted into it.

[0041] Preferably, after the drain and vent plug 3 is installed, its upper end fits with the hole 1 to form a flush surface.

[0042] like Figure 2 As shown; the drainage and venting plug 3 has a rigid mesh skeleton structure (larger at the top and smaller at the bottom, making it easy to quickly align with the holes and insert into place); the distributed mesh holes form a dense drainage and venting channel, connecting the inside and outside; among them, the mesh holes can be rhomboid, circular, etc., and have good structural strength on the basis of effective connection.

[0043] Preferably, the drain and vent plug 3 is made of PVC or reinforced nylon and other materials, forming a hollow mesh structure to provide an unobstructed passage for gas and moisture; at the same time, an integral fixed wing plate can be set for easy positioning and installation.

[0044] In some embodiments, it further includes a functional membrane 7 placed inside the hole 1 and in direct contact with the concrete.

[0045] It should be noted that the functional membrane 7 is a groove-shaped structure that matches the structure of the hole 1, and has a flat outer edge, which is placed outside the hole 1.

[0046] When in use, the functional membrane 7 can be placed directly into the hole 1; or, the functional membrane 7 can be placed on the drain and vent plug 3 and placed along with the drain and vent plug 3.

[0047] It is understandable that the internal space dimensions of the functional membrane 7 match the drainage and venting plug 3, and the external dimensions match the hole 1; during use, a very tight fit is not required, it is sufficient to form a close fit with the hole 1; the functional membrane 7 has a water-guiding function.

[0048] After placement, under the support of the drainage and venting plug 3, the frontmost surface of the functional membrane 7 directly contacts the concrete; water and air are "filtered" by the functional membrane 7 and then discharged outward.

[0049] It should be noted that: Functional membrane 7 is a functional membrane with micro-permeability and water permeability (such as the formwork used in engineering construction); it is in direct contact with freshly poured concrete, and its main functions are: a) to allow air bubbles to pass through; b) to allow water to drain out.

[0050] Furthermore, multiple water-permeable holes 4 are provided on the inner side of the orifice reinforcing ring 2, extending outward.

[0051] like Figure 2 , 3 As shown; before installing the orifice reinforcing ring 2, a hole is made, and the hole runs from the inner ring to the outer ring to form a channel to prevent water from accumulating inside the orifice reinforcing ring 2; preferably, the lower end of the water-permeable hole 4 of the orifice reinforcing ring 2 is open (penetrating the lower outer surface of the orifice reinforcing ring 2), forming a channel that is directly close to the template, which can almost completely drain the water inside the orifice reinforcing ring 2.

[0052] The functions of permeable holes include: a) draining accumulated water: excess water seeping from the concrete is smoothly discharged through the permeable holes; b) preventing blockage: avoiding water accumulation that could lead to oversaturation of the functional membrane or blockage of the air venting channels by the water film.

[0053] In some embodiments, the drain and vent plug 3 is fixed by a positioning structure.

[0054] The positioning structure includes: a wing plate 5 that applies pressure to the drain and vent plug 3, and a fastener 6 that connects the wing plate 5 to the orifice reinforcing ring 2.

[0055] The wing plate 5 can be configured as an "integrated structure with the drain and exhaust plug 3" (as mentioned above, integrated with the rigid mesh skeleton of the drain and exhaust plug 3) or an independent structure.

[0056] See Figure 2 , 3 The wing plate 5 is in a U-shape with extended wings on both sides at the top. Its two extended wings cover the orifice reinforcing ring 2. The depth of the U-shaped structure matches the depth of the orifice reinforcing ring 2, which tightly presses the drain and vent plug 3 into place (fixed in the hole 1). Furthermore, the lower end of the U-shaped structure extends outward in the width direction of the drain and vent plug 3 (that is, it expands outward on the basis of covering the width of the drain and vent plug 3), and also presses and fixes the flat outer edge of the functional membrane 7.

[0057] It is important to note that: positioning and alignment must be well controlled; by designing the drain and vent plug 3 as a structure with different sizes that fit with the hole 1, the placement accuracy of the drain and vent plug 3 can be easily controlled; additional alignment control measures are required for the wing plate 5.

[0058] Preferably, a hole is made on the wing plate 5 at the position corresponding to the hole reinforcing ring 2 to assist in high-precision positioning and alignment; to ensure that it can be quickly and accurately aligned with the hole each time it is placed, and to avoid misalignment that leads to poor sealing or installation difficulties; at this time, it is preferable to set the wing plate 5 and the drainage and exhaust plug 3 as an integrated structure, so as to realize the positioning of the wing plate 5 and the positioning of the drainage and exhaust plug 3 at one time.

[0059] It should be noted that the wing plate 5 and the drain and exhaust plug 3 can also be configured as a mating and snap-fit ​​structure (a form that can be assembled and disassembled); for example, the lower end of the U-shaped structure of the wing plate 5 can be equipped with a snap-fit ​​structure corresponding to some openings of the drain and exhaust plug 3 to form a relative mating connection between the two (it will block some holes, but it will not affect the overall function).

[0060] In addition, the opening position of the wing plate 5 is used to install it with the fastener 6.

[0061] For fastener 6, it can take many forms; for example, the simplest screw assembly (the opening of the wing plate 5 is a smooth hole, and the opening of the reinforcing ring 2 is set with an internal thread). However, screw assembly may not be particularly fast (the actual speed is not slow, which can fully meet the operational requirements), and it is not very conducive to quick assembly and disassembly.

[0062] Alternatively, the fastener 6 can be configured with a quick-locking function. For example... Figure 2 , 3 As shown, a fixed locking hole (long and narrow opening with a large internal space for the insertion shaft to rotate and be positioned) is opened on the reinforcing ring 2 at the orifice; holes are opened at both ends of the wing plate 5 to assemble the insertion shaft through (a thicker base can be added to reduce direct wear on the wing plate 5); a spring is fitted on the outside of the insertion shaft, and an operating handle is provided at the top; the spring presses down on the wing plate 5 (or the base) and pushes up on the operating handle, which in its natural state lifts the operating handle, causing the insertion shaft to be pulled outward as a whole; an extension stop (extending to both sides to form a limiting structure) is fixedly installed perpendicularly to the bottom of the insertion shaft. In use, after rotating the insert shaft until the "extension stop aligns with the opening of the fixed locking slot," press the insert shaft down and insert it into the fixed locking slot of the reinforcing ring 2. Then, rotate the insert shaft to misalign the extension stop with the opening of the fixed locking slot, preventing it from being pulled out. Simultaneously, it maintains its fixed shape under the action of a spring. This quick-release structure is widely used in various fields and can be routinely adopted by technicians. The operating handle at the top of the insert shaft is easy for construction personnel to grip for insertion, locking, and subsequent unlocking and removal operations. When a fastener 6 with a quick-locking function is installed here, it includes, but is not limited to, the above structure.

[0063] It is important to ensure the stability of the installation; for example, the spring force should be controlled to form a reliable limit, so as to prevent it from being easily displaced by vibration and losing its locked state.

[0064] A method for venting and curing construction of the invert arch section of a steel formwork trolley for needle beams includes the following steps: S1. Preparation: Check and clean the holes on the template, check that the structure of the drainage and vent plugs is intact, the voids are in good condition, and the functional membrane is in good condition. S2. Installation: Place the functional membrane in place, align the drainage and vent plugs (using the positioning function), and fix it to the template using fasteners; S3. Pouring and Venting / Drainage: Concrete is poured and vibrated. During concrete vibration, air bubbles or oozing water escape from the concrete flow under the action of vibration force, pass through the functional membrane, and are discharged through the mesh skeleton of the drainage and venting plug, or are drawn out by the functional membrane. S4. Removal and Turnover: After the concrete has set (the specific time is determined based on the mix design test), remove each component (drainage and vent plug, wing plate, fastener), clean the holes in the plug skeleton, replace the new functional membrane, and then put it into the next cycle of use.

[0065] The present invention has at least the following effects: 1) Constructing efficient air and drainage channels: By reasonably opening a specific shape array of holes on the invert arch formwork, a low-resistance air and drainage network is formed to ensure that vibration air bubbles or oozing water can be discharged smoothly and in a timely manner; 2) Achieve device integration: Provides a pluggable plug structure that integrates exhaust, drainage, sealing and fixing functions, and is equipped with functional materials to effectively discharge air bubbles or oozing water that escapes during the vibration process; 3) Ensure reliable and convenient construction: The plug body must have precise positioning and alignment functions and quick locking functions to ensure that it is stable and does not shift under the lateral pressure of concrete, and can be quickly installed and disassembled; 4) Ensure structural safety and repeatability: All opening designs must be mechanically verified to ensure that they do not affect the structural strength of the trolley; the core components of the device are robust, durable, and reusable, with only easily damaged functional parts requiring replacement.

[0066] In a tunnel project, the invert arch formwork of a needle beam trolley was modified using this method; a total of 20 strip holes (25cm long × 2cm wide) were opened and equipped with corresponding plugs (drainage and air vent plugs 3).

[0067] Construction process: The average installation time for each plug is 30 seconds, including about 10 seconds for positioning and alignment and about 20 seconds for locking and securing; during the pouring process, it can be observed that gas is continuously discharged from behind multiple plugs.

[0068] After demolding: The invert arch constructed using the traditional method had a large number of air holes; while in the section using this device, the concrete surface was smooth and flat, and the porosity decreased by more than 95%.

[0069] Tests showed that the average rebound strength of the concrete surface layer in this area increased by 12%.

[0070] After 50 cycles of use, the main structure of the device remained intact and its functions remained reliable.

[0071] It is evident that this application, through innovative device design, upgrades the traditional concept of "venting through openings" into a reliable, efficient, and repeatable standardized process, successfully overcoming the bottleneck in the molding quality of inverted arch concrete.

[0072] This method is used for construction: 1) The ventilation and drainage effect is fundamentally improved: the systematic opening and device-based ventilation channels improve the ventilation and drainage efficiency of the concrete in the invert arch by more than 80%, and the surface pores are basically eliminated after demolding. 2) High construction reliability: Positioning and alignment ensure installation accuracy, reliable fixing ensures stability during the pouring process, and eliminates the risk of device failure; 3) Excellent economic and environmental performance: The equipment can be reused for a long time, which greatly reduces the cost of a single construction project; at the same time, it reduces concrete repairs and material waste caused by defects. 4) High versatility: The device has a clear concept and modular structure, and can be applied to invert arch formwork of different sizes and curvatures, and has broad promotion value.

[0073] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A venting and curing device for the inverted arch section of a steel formwork trolley for needle beams, characterized in that, include: Several holes are made in the template panel (1); The holes (1) are arranged at staggered intervals to form an exhaust and drainage network covering the entire gas-collecting area; Also includes: The reinforcing ring (2) corresponds to the outer periphery of the hole (1). And a removable drain and vent plug (3) that fits into the hole (1).

2. The exhaust and curing device for the inverted arch section of the steel formwork trolley for needle beams according to claim 1, characterized in that, The hole (1) is elongated; it is 2 cm wide and 20-30 cm long.

3. The exhaust and curing device for the inverted arch section of the steel formwork trolley for needle beams according to claim 1, characterized in that, The holes (1) are arranged alternately at intervals of 1.0~1.5m.

4. The exhaust and curing device for the inverted arch section of the steel formwork trolley for needle beams according to claim 1, characterized in that, The inner ring surface of the hole (1) is inclined, forming a structure where the hole is small when close to the concrete end and large when far away from the concrete end.

5. The exhaust and curing device for the inverted arch section of the steel formwork trolley for needle beams according to claim 1, characterized in that, The orifice reinforcing ring (2) is a steel ring made of the same material as the base material and welded together.

6. The exhaust and curing device for the inverted arch section of the steel formwork trolley for needle beams according to claim 1, characterized in that, The inner side of the orifice reinforcing ring (2) is provided with multiple water-permeable holes (4) extending outward.

7. The exhaust and curing device for the inverted arch section of the steel formwork trolley for needle beams according to claim 1, characterized in that, The structure of the drain and vent plug (3) is matched with the hole (1) and inserted therein; The drainage and venting plug (3) has a rigid mesh skeleton structure, forming a fine drainage and venting passage.

8. The exhaust and curing device for the inverted arch section of the steel formwork trolley for needle beams according to claim 1, characterized in that, The drain and vent plug (3) is fixed by a positioning structure; The positioning structure includes: The wing plate (5) applies pressure to the drain and vent plug (3). And a fastener (6) that connects the wing plate (5) to the orifice reinforcing ring (2).

9. The exhaust and curing device for the inverted arch section of the steel formwork trolley for needle beams according to claim 1, characterized in that, Also includes: A functional membrane (7) is placed inside the hole (1) and in direct contact with the concrete.

10. A method for venting and curing construction of the invert arch section of a steel formwork trolley for needle beams, characterized in that, The exhaust curing device according to any one of claims 1 to 9 includes the following steps: S1. Preparation: Check and clean the holes on the template, and check that the drainage and vent plugs and functional membrane are intact; S2. Installation: Place the functional membrane in place, install the drainage and vent plugs, and fix it to the template using fasteners; S3. Pouring and Venting / Drainage: During concrete pouring and vibration, any escaping air bubbles or oozing water are discharged through the functional membrane and the mesh skeleton of the plug body under the action of vibration force. S4. Removal and Turnover: After the concrete has set, remove the drainage and vent plugs, clean the plug skeleton, replace the new functional membrane, and put it into the next cycle of use.

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