An inflatable core form support system for municipal box culvert construction

Abstract

This utility model discloses an inflatable core mold support system for municipal box culvert construction, including A-type airbags, B-type airbags, and support airbags. Multiple A-type, B-type, and support airbags are combined and connected in the cross-sectional direction of the box culvert to form an inverted E-type structure, and extend and connect in the longitudinal direction. A-type airbags are located at the four corners of the E-type structure, B-type airbags are connected in series between any two adjacent A-type airbags, and support airbags are vertically supported and connected in the middle of the E-type structure. The interiors of A-type and B-type airbags, any adjacent B-type airbags, and B-type airbags and support airbags are all connected by one-way air valves, and their external surfaces are connected by airbag buckles. The interiors of the airbags are connected in series via one-way air valves in the longitudinal direction of the box culvert, and their external surfaces are connected by airbag buckles. The use of inflatable core molds improves the production efficiency of concrete components, reduces energy consumption, and minimizes environmental pollution.

Description

Technical Field

[0001] This utility model relates to the field of municipal box culvert construction technology, specifically to an inflatable core mold support system for municipal box culvert construction. Background Technology

[0002] Rainwater box culverts refer to culverts constructed with reinforced concrete box-shaped pipe sections. They are statically indeterminate structures that can adapt to different geological conditions and are characterized by simple structure, convenient construction, low cost, and easy maintenance.

[0003] For example, Chinese patent document [Application No.: CN221589689U] discloses an integral internal formwork support structure for rainwater box culverts. This structure includes a base plate, supports, connecting mechanisms, and telescopic mechanisms. Through components such as connecting shells, connecting shafts, slots, chucks, hydraulic telescopic rods, fixing grooves, and fixing screws, it allows for multi-angle connections and telescopic adjustments between supports. This enables flexible splicing and adjustment of the support structure, adapting to the needs of box culverts of different sizes, simplifying construction steps, improving support stability, and preventing displacement and detachment of the telescopic mechanism.

[0004] However, in the construction of the aforementioned formwork support structure, since cast-in-place construction requires the support of both inner and outer formwork, for larger box culverts, the lower half of the bottom slab and sidewalls must be poured first, followed by the support of the inner and outer formwork for the upper sidewalls and top slab. This process involves cumbersome formwork erection steps, involving a large amount of formwork splicing, fixing, and adjustment work, which consumes considerable manpower and time. After the concrete reaches its design strength, the formwork removal operation is complex, especially for large box culverts where the formwork is tightly fitted to the concrete structure. Improper operation during removal can easily damage the surface of the box culvert structure, such as chipped corners or missing edges, affecting the structural appearance and quality. Utility Model Content

[0005] In view of this, the main purpose of this utility model is to propose an inflatable core mold support system for municipal box culvert construction, which improves the production efficiency of concrete components, reduces energy consumption and environmental pollution, and can withstand greater pressure and impact to ensure construction safety.

[0006] To achieve the above objectives, this utility model proposes an inflatable core mold support system for municipal box culvert construction, which includes an A-type airbag, a B-type airbag, and a support airbag.

[0007] Multiple A-type airbags, B-type airbags, and support airbags are combined and connected in the cross-sectional direction of the box culvert to form an inverted E-type structure, and are connected and extended longitudinally in the direction perpendicular to the cross-sectional direction of the box culvert.

[0008] The type A airbags are located at the four corners of the type E structure, the type B airbags are connected in series between any two adjacent type A airbags, and the support airbags are vertically supported and connected to the middle of the type E structure.

[0009] The interiors of the type A airbag and the type B airbag, any adjacent type B airbag, and the type B airbag and the supporting airbag are adapted to be connected along the cross-sectional direction of the box culvert via one-way air valves; the outer surfaces of the type A airbag and the type B airbag, any adjacent type B airbag, and the type B airbag and the supporting airbag are connected via airbag buckles.

[0010] The interiors of the multiple type A airbags, type B airbags, and supporting airbags are connected in series via the one-way air valves in the longitudinal extension direction of the box culvert; the exteriors of the multiple type A airbags, type B airbags, and supporting airbags are all connected via the airbag buckles in the longitudinal extension direction of the box culvert.

[0011] Optionally, the airbag may also have a support tube connected to a support seat, which is connected to the inner wall of the airbag.

[0012] Optionally, the airbag buckle includes:

[0013] The snap-fit ​​part is provided with a first connecting part, and the first connecting part is connected to one of any two adjacent A-type airbags, B-type airbags and support airbags.

[0014] The fastening part is provided with a second connecting part that connects to another of any adjacent type A airbag, type B airbag, and support airbag; the second connecting part, the snap-fit ​​part, and the fastening part are detachably provided.

[0015] The snap-fit ​​part is provided with a first inner cavity and a second inner cavity. Two snap-fit ​​openings are provided at both ends of the first inner cavity, and two connecting slots are provided between the first inner cavity and the second inner cavity.

[0016] A snap-fit ​​component is fixedly mounted on the fastening part. When the snap-fit ​​part and the fastening part are in an assembled state, the snap-fit ​​component is located in the slot of the snap-fit ​​part.

[0017] A fixing block, which is fixedly disposed in the middle of the snap-fit ​​component;

[0018] A release component is disposed in the second inner cavity of the latching portion. When the latching portion and the fastening portion are in the combined state, the release component is connected to the fixing block and the latching member.

[0019] Optionally, the snap-fit ​​component includes:

[0020] The connecting frame is fixedly mounted on the outer wall of the fastening part;

[0021] The extension rods are fixedly connected to both ends of the connecting frame. A locking block is provided on the end of the extension rod away from the second connecting part. Each locking block is also provided with a protrusion, which contacts the release component.

[0022] Optionally, the sidewall of the card block has an arc-shaped structure, and the protrusion on each card block protrudes from the card block.

[0023] Optionally, each of the extension rods is inclined, with one end of the extension rod near the second connecting part inclined inward to provide the fastening part with a movable space within the snap-fit ​​part. An elastic metal sheet is also provided on the inner wall of the snap-fit ​​part within each movable space.

[0024] Optionally, the one-way valve includes:

[0025] A valve seat is connected to one of any two adjacent A-type airbags, B-type airbags, and support airbags, and the valve seat is provided with an air outlet through it;

[0026] The valve body assembly is connected to another of any two adjacent A-type airbags, B-type airbags, and support airbags;

[0027] The valve seat is threaded to the side of the valve body assembly that is close to each other.

[0028] Optionally, the valve body assembly includes:

[0029] The valve body includes a first valve body and a second valve body integrally connected. The first valve body is provided with an air inlet and an intermediate hole that are sequentially connected, and the intermediate hole extends to the end of the second valve body. The diameter of the air inlet is smaller than the diameter of the intermediate hole.

[0030] A sphere is disposed on the side of the central hole near the air inlet, and the diameter of the sphere is larger than the diameter of the air inlet.

[0031] A compression spring is disposed in the intermediate hole, one end of the compression spring abuts against the ball, and the other end is supported and connected to the support rod, which is inserted into the inner wall of the intermediate hole located inside the second valve body;

[0032] The second valve body has an external thread on its outer circumference, and the valve seat has an internal thread on its inner wall of the vent hole. The external thread is connected to the internal thread.

[0033] Optionally, a sealing ring is also fitted on the outer circumference of the second valve body. When the valve seat is combined and connected with the valve body assembly, the first valve body is adapted to press the sealing ring against the end face of the valve seat.

[0034] Optionally, it also includes a pressure relief valve disposed on the type A airbag, the type B airbag, and the support airbag.

[0035] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0036] 1. In the technical solution of this utility model, the inflatable core mold support system for municipal box culvert construction combines multiple A-type airbags, B-type airbags, and support airbags in an inverted E-shaped structure along the cross-sectional direction of the box culvert. The A-type airbags are located at the four corners of the E-shaped structure, the B-type airbags are connected in series between adjacent A-type airbags, and the support airbags are vertically supported in the middle of the E-shaped structure. Simultaneously, in the longitudinal extension direction of the box culvert, the airbags are also connected and extended sequentially. The interiors of each airbag are connected by one-way valves, and the exteriors of each airbag are connected by airbag buckles. Inflation is performed by an inflation device, and since the interiors are connected by one-way valves, the gas can flow between the airbags. The A-type airbags, B-type airbags, and support airbags gradually expand after inflation, forming a stable inverted E-shaped structure, which serves as the inner mold for box culvert construction, providing support and shape control for concrete pouring. During concrete pouring, the airbags remain inflated to resist the pressure of the concrete, ensuring the shape and dimensions of the box culvert structure. The airbag clips ensure a tight fit between the airbags at the external connections, preventing displacement and guaranteeing the stability of the overall structure. Once the concrete reaches a certain strength, the air is expelled from the airbags via an exhaust device, causing them to deflate and allowing for easy removal and recycling from the culvert for reuse. The airbag materials (Type A, Type B, and support airbags) possess elasticity and durability, allowing for multiple reuses under normal use and maintenance, reducing construction costs. This method is more economical and environmentally friendly compared to traditional disposable molds. The airbags are connected by one-way valves and clips, allowing for rapid expansion to form a unified structure after inflation. Installation is time-saving and labor-saving; after use, the airbags deflate easily, facilitating disassembly and recycling, improving construction efficiency, and saving time and labor costs. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0038] Figure 1This is a three-dimensional structural diagram of the inflatable core mold support system for municipal box culvert construction in this embodiment of the present invention;

[0039] Figure 2 This is a side view sectional structural diagram of the inflatable core mold support system for municipal box culvert construction in this embodiment of the present invention;

[0040] Figure 3 This is a schematic diagram of the airbag buckle structure in an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the structure of the airbag buckle installed on the inflatable core mold support system for municipal box culvert construction in this embodiment of the present invention;

[0042] Figure 5 This is a schematic diagram of the internal structure of the airbag buckle in an embodiment of the present invention;

[0043] Figure 6 This is a schematic diagram of the installation structure of the one-way air valve in an embodiment of this utility model;

[0044] Figure 7 This is a schematic diagram of the internal structure of the valve body assembly in an embodiment of this utility model;

[0045] Figure 8 This is a schematic diagram of the cross-sectional structure of the box culvert in an embodiment of this utility model.

[0046] Explanation of icon numbers:

[0047] 1-Type A airbag; 2-Type B airbag; 3-Support airbag; 31-Support tube;

[0048] 4- One-way air valve;

[0049] 41-Valve seat; 411-Air outlet;

[0050] 42-Valve body assembly; 421-Valve body; 4211-First valve body; 42111-Inlet port; 42112-Intermediate hole; 4212-Second valve body; 422-Ball; 423-Compression spring; 424-Support rod;

[0051] 43 - Sealing ring;

[0052] 5-Airbag buckle;

[0053] 51-Snap-fit ​​part; 511-First connecting part; 512-First inner cavity; 513-Second inner cavity; 514-Elastic metal sheet; 515-Bayonet;

[0054] 52-Engaging part; 521-Second connecting part;

[0055] 53-Snap-fit ​​component; 531-Connecting bracket; 532-Extension rod; 533-Snap-fit ​​block; 5331-First protrusion; 5332-Second protrusion;

[0056] 54-Fixed Block;

[0057] 6-Box culvert. Detailed Implementation

[0058] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0059] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0060] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0061] Highway stormwater box culverts refer to culverts constructed with reinforced concrete box-shaped pipe sections. They are statically indeterminate structures adaptable to various geological conditions, characterized by simple structure, convenient construction, low cost, and easy maintenance. Currently, box culvert construction generally employs cast-in-place methods. A bottom layer is set in the excavated trench, a concrete foundation is poured, and then the pre-fabricated reinforcing bars are tied on-site. Inner and outer formwork are then erected. For larger box culverts, the bottom slab and the lower half of the side walls are typically poured first, followed by tying the upper side wall and top slab reinforcement, erecting the inner and outer formwork, and then pouring the upper half of the side walls and top slab. Once the concrete reaches the design strength, the formwork is removed, and backfilling is performed simultaneously on both sides of the box culvert.

[0062] However, using the above technical solutions requires both inner and outer formwork for cast-in-place construction. For larger box culverts, the bottom slab and lower half of the sidewalls must be poured first, followed by the erection of the inner and outer formwork for the upper sidewalls and top slab. This process involves cumbersome formwork erection steps, including extensive formwork splicing, fixing, and adjustment, requiring significant manpower and time. After the concrete reaches its design strength, formwork removal is complex, especially for large box culverts where the formwork is tightly fitted to the concrete structure. Improper removal can easily damage the surface of the box culvert structure, such as chipped corners or missing edges, affecting the structural appearance and quality.

[0063] To resolve the above technical issues, please refer to [link / reference]. Figure 1-8 As shown, this utility model embodiment provides an inflatable core mold support system for municipal box culvert construction. This inflatable core mold support system is used in the construction of box culvert 6. The system includes an A-type airbag 1, a B-type airbag 2, and a support airbag 3, wherein:

[0064] Multiple type A airbags 1, type B airbags 2, and support airbags 3 are located in the cross-sectional direction of the box culvert 6 (i.e., attached). Figure 1 The X-axis direction of the box culvert 6 is combined and connected to form an inverted E-shaped structure, and it extends longitudinally in the direction perpendicular to the cross-section of the box culvert 6 (that is, the longitudinal extension direction of the box culvert 6).

[0065] Type A airbags 1 are located at the four corners of the E-type structure, Type B airbags 2 are connected in series between any two adjacent Type A airbags 1, and support airbags 3 are vertically supported and connected to the middle of the E-type structure.

[0066] The interiors of type A airbag 1 and type B airbag 2, any adjacent type B airbag 2, and type B airbag 2 and supporting airbag 3 are connected by one-way air valves 4 along the cross-sectional direction of box culvert 6; the exterior surfaces of type A airbag 1 and type B airbag 2, any adjacent type B airbag 2, and type B airbag 2 and supporting airbag 3 are connected by airbag buckles 5.

[0067] The interiors of multiple type A airbags 1, type B airbags 2, and supporting airbags 3 are connected in series via one-way air valves 4 in the longitudinal extension direction of the box culvert 6; the exteriors of multiple type A airbags 1, type B airbags 2, and supporting airbags 3 are all connected via airbag buckles 5 in the longitudinal extension direction of the box culvert 6.

[0068] Specifically, in this embodiment, in the cross-sectional direction of the box culvert 6, multiple A-type airbags 1, B-type airbags 2, and supporting airbags 3 are combined and connected in an inverted E-shaped structure. The A-type airbags 1 are located at the four corners of the E-shaped structure, the B-type airbags 2 are connected in series between adjacent A-type airbags 1, and the supporting airbags 3 are vertically supported in the middle of the E-shaped structure. Simultaneously, in the longitudinal extension direction of the box culvert 6, the airbags are also connected and extended sequentially. The interiors of each airbag are connected by a one-way air valve 4, and the exteriors of each airbag are connected by airbag buckles 5.

[0069] Inflation is achieved by filling the air bladders with air. Since the internal structures are interconnected via one-way valves 4, gas can flow between the air bladders. Type A air bladder 1, Type B air bladder 2, and supporting air bladder 3 gradually expand after inflation, forming a stable inverted E-shaped structure. This structure serves as the inner mold for the box culvert 6 construction, providing support and shape control for concrete pouring. During concrete pouring, the air bladders remain inflated to resist the pressure of the concrete, ensuring the shape and dimensions of the box culvert 6 structure. Air bladder clips 5 ensure a tight fit between the air bladders at external connections, preventing displacement and guaranteeing the stability of the overall structure. Once the concrete reaches a certain strength, the gas inside the air bladders is expelled through an exhaust device, causing the air bladders to contract and allowing for easy removal and recycling from the box culvert for reuse.

[0070] Therefore, the airbag material (Type A airbag 1, Type B airbag 2, and supporting airbag 3) possesses a certain degree of elasticity and durability, allowing for repeated use under normal use and maintenance, thus reducing construction costs. It is more economical and environmentally friendly compared to traditional disposable molds. The airbags are connected by one-way valves 4 and airbag clips 5, allowing for rapid expansion to form a unified structure after inflation. Installation is time-saving and labor-saving; after use, the airbags deflate, facilitating disassembly and recycling, improving construction efficiency, and saving time and labor costs.

[0071] Understandably, by adjusting the number and connection method of airbags (Type A airbag 1, Type B airbag 2 and support airbag 3) according to different box culvert size and shape requirements, it can flexibly adapt to various highway construction scenarios and has strong versatility and applicability.

[0072] Additionally, it is important to clarify that "box culvert 6" refers to a culvert constructed with reinforced concrete box-shaped pipe sections. A box culvert 6 consists of one or more square or rectangular cross-sections, generally made of reinforced concrete or masonry, but reinforced concrete is more widely used. Box culverts are used when the span is less than 4m. For pipe culverts, reinforced concrete box culverts are a cheaper alternative, with piers, abutments, and upper and lower slabs all cast uniformly.

[0073] Specifically, please refer to Figure 2 As shown, the inside of the support airbag 3 is also provided with a support tube 31 connected by a support seat, and the support seat is connected to the inner wall of the support airbag 3.

[0074] Therefore, by setting a support tube 31 inside the support airbag 3, with both ends of the support tube 31 connected to the inner wall of the support airbag 3 through support seats, the structural strength and stability of the support airbag 3 can be effectively enhanced, and it performs better in resisting the pressure generated during concrete pouring. This reduces the risk of the airbag deforming or being damaged due to excessive force, thereby improving the stability and reliability of the entire inflatable core mold and ensuring the structural shape and dimensional accuracy of the box culvert 6.

[0075] Specifically, please refer to Figure 3 , 4 As shown, the airbag buckle 5 includes a snap-fit ​​part 51, a fastening part 52, a snap-fit ​​element 53, and a fixing block 54, wherein:

[0076] The snap-fit ​​part 51 is provided with a first connecting part 511, and the first connecting part 511 is used to connect to one of any adjacent type A airbag 1, type B airbag 2 and support airbag 3.

[0077] The fastening part 52 is provided with a second connecting part 521, and the second connecting part 521 is used to connect to another one between any two adjacent type A airbags 1, type B airbags 2 and support airbags 3; the snap-fit ​​part 51 and the fastening part 52 are detachably provided on the side that is close to each other.

[0078] The snap-fit ​​part 51 is provided with a first inner cavity 512 and a second inner cavity 513. The first inner cavity 512 has two slots 515 at both ends. The snap-fit ​​member 53 is fixedly installed on the fastening part 52. When the snap-fit ​​part 51 and the fastening part 52 are in the combined state, the snap-fit ​​member 53 is located in the slots 515 of the snap-fit ​​part 51. The fixing block 54 is fixedly installed on the fastening part 52 and is located in the middle of the snap-fit ​​member 53.

[0079] Specifically, in this embodiment, the connection positions of the snap-fit ​​part 51 and the fastening part 52 are determined between any two adjacent type A airbags 1, type B airbags 2, and support airbags 3. That is, the snap-fit ​​part 51 is connected to one of the airbags through the first connecting part 511, and the fastening part 52 is connected to the other adjacent airbag through the second connecting part 521. The snap-fit ​​part 51 and the fastening part 52 are brought close to each other, so that the snap-fit ​​member 53 is aligned with the snap-fit ​​opening 515 of the snap-fit ​​part 51 and inserted therein. During the insertion process, the snap-fit ​​member 53 will slide in along the snap-fit ​​opening 515, and after reaching the appropriate position, the first inner cavity 512 and the second inner cavity 513 provided in the snap-fit ​​part 51 will cooperate to achieve stable snap-fit ​​of the snap-fit ​​member 53 in the snap-fit ​​opening 515, thereby tightly connecting the adjacent airbags together.

[0080] Specifically, please refer to Figure 4 , 5 As shown, the snap-fit ​​component 53 includes a connecting frame 531, an extension rod 532, and a snap-fit ​​block 533, wherein:

[0081] The connecting frame 531 is fixedly mounted on the outer wall of the fastening part 52; two extension rods 532 are fixedly connected to both ends of the connecting frame 531, and a locking block 533 is provided on the end of the extension rod 532 away from the second connecting part 521. Each locking block 533 is also provided with a protrusion 5331, which contacts the release component.

[0082] During the airbag buckle connection process, as the buckling part 52 approaches the locking part 51, the locking block 533 and the protrusion 5331, driven by the extension rod 532 and the connecting frame 531, gradually align with the locking slot 515 on the locking part 51. When the buckling part 52 contacts the locking part 51 and applies a certain pressure, the locking block 533, under the action of elasticity or appropriate guidance, begins to insert into the locking slot 515; as the buckling part 52 and the locking part 51 move closer together, the locking block 533 is fully inserted into the locking slot 515, at which point the protrusion 5331 contacts the release component and interacts with it. In the normal connection state, with the cooperation of the release component, the protrusion 5331 ensures that the locking block 533 is stably locked in the locking slot 515, achieving a tight connection between the airbags.

[0083] When it is necessary to remove the airbag buckle 5, the release component is operated to act on the protrusion 5331. The protrusion 5331 drives the locking block 533 to move in the locking slot 515, so that the locking block 533 is disengaged from the locking slot 515, thereby realizing the rapid release and separation of the airbag buckle 5.

[0084] Specifically, please refer to Figure 4 , 5 As shown, the sidewall of the locking block 533 has an arc-shaped structure. The protrusion 5331 on each locking block 533 protrudes out of the locking block 533 and contacts the release component. When the airbag is subjected to a strong pull under an abnormal force angle, the release component contacts and pushes the protrusion 5331 on the locking block 533, causing the locking part 51 and the fastening part 52 to automatically disengage. This structure not only ensures the stable connection of the buckle during normal use, but also automatically disengages in case of abnormal conditions, preventing damage or instability of the buckle and improving safety.

[0085] In some examples, specifically, please refer to Figure 4 As shown, each extension rod 532 is inclined, and the end of the extension rod 532 near the second connecting part 521 is inclined inward to provide the fastening part 52 with a movable space in the snap-fit ​​part 51. An elastic metal sheet 514 is also provided on the inner wall of the snap-fit ​​part 51 in each movable space.

[0086] Understandably, the inclined structure of each extension rod 532 causes the end near the second connecting part 521 to tilt inward, providing room for the fastening part 52 to move within the locking part 51, thus improving the ease of use of the buckle. At the same time, an elastic metal sheet 514 is provided on the inner wall of the locking part 51 within the moving space, so that when the locking part 51 and the fastening part 52 are combined, the elastic metal sheet 514 can provide a certain support effect with the locking block 533, thereby ensuring a stable connection between the locking part 51 and the fastening part 52. Therefore, the design of the inclined extension rod 532 and the elastic metal sheet 514 together improves the safety performance and ease of use of the airbag buckle 5 under normal use and abnormal conditions.

[0087] In some examples, please refer to Figure 6 As shown, the one-way valve 4 further includes a valve seat 41 and a valve body assembly 42, wherein:

[0088] The valve seat 41 is connected to one of any two adjacent A-type airbags 1, B-type airbags 2 and support airbags 3, and the valve seat 41 is provided with an air outlet 411 through it.

[0089] The valve body assembly 42 is connected to the other of any two adjacent A-type airbags 1, B-type airbags 2 and support airbags 3;

[0090] The valve seat 41 is threaded to the valve body assembly 42 on the side close to each other.

[0091] Specifically, the valve seat 41 is connected to one of two adjacent airbags (which can be type A, type B, or support airbags), and an outlet hole 411 is provided through the valve seat 41. Simultaneously, the valve body assembly 42 is connected to the other of the two adjacent airbags. Then, the valve seat 41 and the valve body assembly 42 are threaded together on their adjacent sides to complete the assembly of the one-way valve 4, connecting it between the two adjacent airbags and forming a channel for internal gas communication.

[0092] When the airbag is inflated, the gas, under pressure, enters the air inlet through the valve body assembly 42, and then enters the adjacent airbag through the air outlet 411 of the valve seat 41, achieving unidirectional flow of gas between adjacent airbags. Due to the tightness of the threaded connection, it is ensured that the gas can only flow in the set direction and will not flow backward.

[0093] During exhaust, due to the presence of the one-way valve 4, gas can only be discharged from inside the airbag to the outside through the one-way valve 4, and there will be no backflow of gas into adjacent airbags, thus achieving rapid exhaust and contraction of the airbag.

[0094] In some examples, please refer to Figure 7As shown, further, the valve body assembly 42 includes a valve body 421, a ball 422, and a compression spring 423, wherein:

[0095] The valve body 421 includes a first valve body 4211 and a second valve body 4212 integrally connected. The first valve body 4211 has a through-hole 42111 and a central hole 42112 that are sequentially connected, and the central hole 42112 extends to the end of the second valve body 4212. The diameter of the air inlet 42111 is smaller than the diameter of the central hole 42112. A ball 422 is disposed on the side of the central hole 42112 near the air inlet 42111, and the diameter of the ball 422 is larger than the diameter of the air inlet 42111. The diameter of the air hole 42111; the compression spring 423 is provided in the intermediate hole 42112, one end of the compression spring 423 abuts against the ball 422, and the other end is supported and connected to the support rod 424, the support rod 424 is inserted into the inner wall of the intermediate hole 42112 located inside the second valve body 4212; the outer circumference of the second valve body 4212 is provided with an external thread, and the inner wall of the air outlet 411 of the valve seat 41 is provided with an internal thread, and the external thread is connected to the internal thread.

[0096] Thus, when gas enters the valve body assembly 42 through the air inlet 42111, the gas pressure overcomes the thrust of the compression spring 423 on the ball 422, causing the ball 422 to move towards the side of the intermediate hole 42112 away from the air inlet 42111. The gas passes through the air inlet 42111 and the intermediate hole 42112 in sequence, and then enters the adjacent air bladder through the air outlet 411 of the valve seat 41, achieving unidirectional gas flow. Because the ball 422 blocks the air inlet 42111 under the action of the compression spring 423, the gas cannot flow back from the adjacent air bladder through the valve body assembly 42 to the original air bladder, but can only be discharged from the air bladder through other exhaust devices, thereby realizing the exhaust and contraction of the air bladder.

[0097] In some examples, please refer to Figure 6 As shown, furthermore, a sealing ring 43 is also fitted on the outer circumference of the second valve body 4212. When the valve seat 41 is combined and connected with the valve body assembly 42, the first valve body 4211 is adapted to press the sealing ring 43 against the end face of the valve seat 41, which further improves the sealing performance of the one-way air valve 4, ensures that the gas inside the airbag will not leak from the connection between the valve seat 41 and the valve body assembly 42, ensures the stability of the airbag inflation pressure, and enables the airbag to better maintain its shape and size in the inflation state, providing stable internal mold support for concrete pouring, improving the construction quality of the box culvert, and reducing quality problems caused by insufficient airbag pressure due to gas leakage.

[0098] More specifically, the inflatable core mold support system for municipal box culvert construction also includes pressure relief valves installed on type A airbag 1, type B airbag 2, and support airbag 3. During concrete pouring, the pressure relief valves effectively maintain stable internal pressure within the airbags, preventing uneven concrete pouring or defects such as honeycomb pitting and voids caused by pressure fluctuations. This improves the quality and precision of box culvert construction and extends the service life of the box culvert.

[0099] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An inflatable core mold support system for municipal box culvert construction, used in box culvert (6) construction, characterized in that, Including type A airbag (1), type B airbag (2) and support airbag (3); Multiple A-type airbags (1), B-type airbags (2) and support airbags (3) are combined and connected in the cross-sectional direction of the box culvert (6) to form an inverted E-type structure, and are connected and extended longitudinally in the direction perpendicular to the cross-sectional direction of the box culvert (6). The type A airbag (1) is located at the four corners of the type E structure, the type B airbag (2) is connected in series between any two adjacent type A airbags (1), and the support airbag (3) is vertically supported and connected to the middle of the type E structure; The interiors of the type A airbag (1) and the type B airbag (2), any adjacent type B airbag (2), and the type B airbag (2) and the supporting airbag (3) are connected by a one-way air valve (4) along the cross-sectional direction of the box culvert (6); the exterior surfaces of the type A airbag (1) and the type B airbag (2), any adjacent type B airbag (2), and the type B airbag (2) and the supporting airbag (3) are connected by airbag buckles (5). The interiors of the multiple type A airbags (1), type B airbags (2) and support airbags (3) are connected in series via the one-way air valves (4) in the longitudinal extension direction of the box culvert (6); the exteriors of the multiple type A airbags (1), type B airbags (2) and support airbags (3) are connected via the airbag buckles (5) in the longitudinal extension direction of the box culvert (6).

2. The inflatable core mold support system for municipal box culvert construction according to claim 1, characterized in that, The airbag (3) is also provided with a support tube (31) connected by a support seat, which is connected to the inner wall of the airbag (3).

3. The inflatable core mold support system for municipal box culvert construction according to claim 1, characterized in that, The airbag buckle (5) includes: The snap-fit ​​part (51) is provided with a first connecting part (511), and the first connecting part (511) is connected to one of any adjacent A-type airbag (1), B-type airbag (2) and support airbag (3); The fastening part (52) is provided with a second connecting part (521), and the second connecting part (521) is connected to the other of any adjacent type A airbag (1), type B airbag (2) and support airbag (3); the second connecting part (521) and the snap-fit ​​part (52) are detachably provided; The snap-fit ​​part (51) is provided with a first inner cavity (512) and a second inner cavity (513), and two snap-fit ​​openings (515) are provided at both ends of the first inner cavity (512). A snap-fit ​​component (53) is fixedly mounted on the fastening part (52). When the snap-fit ​​part (51) and the fastening part (52) are in a combined state, the snap-fit ​​component (53) is located in the slot (515) of the snap-fit ​​part (51). A fixing block (54) is fixedly disposed in the middle of the snap-fit ​​member (53); The release assembly is disposed in the second inner cavity (513) of the latching part (51). When the latching part (51) and the fastening part (52) are in the combined state, the release assembly is connected to the fixing block (54) and the latching member (53).

4. The inflatable core mold support system for municipal box culvert construction according to claim 3, characterized in that, The snap-fit ​​connector (53) includes: The connecting bracket (531) is fixedly mounted on the outer wall of the fastening part (52); The extension rods (532) are fixedly connected to both ends of the connecting frame (531). A locking block (533) is also provided on the end of the extension rod (532) away from the second connecting part (521). A protrusion (5331) is also provided on each locking block (533), and the protrusion (5331) is in contact with the release component.

5. The inflatable core mold support system for municipal box culvert construction according to claim 4, characterized in that, The sidewall of the card block (533) is an arc-shaped structure, and the protrusion (5331) on each card block (533) protrudes from the card block (533).

6. The inflatable core mold support system for municipal box culvert construction according to claim 4, characterized in that, Each of the extension rods (532) is inclined, with one end of the extension rod (532) near the second connecting part (521) inclined inward to provide the fastening part (52) within the snap-fit ​​part (51) for providing the fastening part (52) with a movable space. An elastic metal sheet (514) is also provided on the inner wall of the snap-fit ​​part (51) within each movable space.

7. The inflatable core mold support system for municipal box culvert construction according to claim 1, characterized in that, The one-way air valve (4) includes: A valve seat (41) is connected to one of any two adjacent A-type airbags (1), B-type airbags (2) and support airbags (3), and the valve seat (41) is provided with an air outlet (411). The valve body assembly (42) is connected to one of any two adjacent A-type airbags (1), B-type airbags (2) and support airbags (3); The valve seat (41) is threaded to the side of the valve body assembly (42) that is close to each other.

8. The inflatable core mold support system for municipal box culvert construction according to claim 7, characterized in that, The valve body assembly (42) includes: The valve body (421) includes a first valve body (4211) and a second valve body (4212) integrally connected. The first valve body (4211) is provided with an air inlet (42111) and an intermediate hole (42112) that are connected in sequence. The intermediate hole (42112) extends to the end of the second valve body (4212). The diameter of the air inlet (42111) is smaller than the diameter of the intermediate hole (42112). A sphere (422) is disposed on the side of the intermediate hole (42112) near the air inlet (42111), and the diameter of the sphere (422) is larger than the diameter of the air inlet (42111). A compression spring (423) is provided in the intermediate hole (42112). One end of the compression spring (423) abuts against the ball (422), and the other end is supported and connected to the support rod (424). The support rod (424) is inserted into the inner wall of the intermediate hole (42112) located inside the second valve body (4212). The second valve body (4212) has an external thread on its outer circumference, and the valve seat (41) has an internal thread on its inner wall of the air outlet (411). The external thread is connected to the internal thread.

9. The inflatable core mold support system for municipal box culvert construction according to claim 8, characterized in that, A sealing ring (43) is also fitted on the outer circumference of the second valve body (4212). When the valve seat (41) is combined and connected with the valve body assembly (42), the first valve body (4211) is adapted to press the sealing ring (43) against the end face of the valve seat (41).

10. The inflatable core mold support system for municipal box culvert construction according to claim 7, characterized in that, It also includes pressure relief valves installed on the type A airbag (1), the type B airbag (2) and the support airbag (3).

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