Ultra-long concrete wall one-time forming split construction structure

Abstract

The utility model discloses a kind of one-time forming joint construction structure of super-long concrete wall, belong to building construction technical field.The structure is aimed at the problem that the construction super-long concrete wall expansion joint of traditional jump warehouse method is longer, and flexible filling material in expansion joint is easy to deform displacement under the lateral pressure of concrete pouring, composite formwork formed by extruded sheet and three-ply board pasted on its two sides respectively is used as expansion joint forming template, and the positioning stability of formwork is ensured by making three-ply board outside close to steel bar protective layer cushion block.The structure provides stable and reliable formwork system for the construction of super-long reinforced concrete wall expansion joint, is conducive to ensuring expansion joint forming quality and supporting parallel construction of the wall on both sides of joint.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, specifically relating to a one-time forming and jointed construction structure for ultra-long concrete walls. Background Technology

[0002] In the fields of architecture and civil engineering, ultra-long reinforced concrete walls are a common structural form, used for purposes such as perimeter walls of large factories, diaphragm walls, or retaining walls in hydraulic facilities. These walls are typically long, reaching hundreds or even thousands of meters, and their height may exceed several meters. To prevent structural cracking caused by concrete shrinkage and temperature changes, the design usually requires expansion joints at regular intervals along the length of the wall. These expansion joints must be pre-designed to the required width and are often designed in the form of tongue and groove joints. The joints must be filled with a specified flexible sealing material, such as extruded polystyrene board, to allow for a certain degree of structural deformation.

[0003] In traditional construction methods, for extra-long walls with expansion joints, the skip-construction method or segmented construction is commonly used. This involves constructing one wall segment between two adjacent expansion joints first, and only after the concrete in that segment has reached a certain strength and the formwork has been removed, proceeding to the next adjacent wall segment. This sequential approach primarily facilitates the erection and reinforcement of formwork at the expansion joint locations. Because expansion joints are typically filled with a soft, low-strength flexible material, if the concrete on both sides is poured simultaneously before it has solidified, the flexible filler is highly susceptible to compression, twisting, or displacement under the lateral pressure generated by the flowing concrete. This not only makes it difficult to guarantee the geometric dimensions of the expansion joint (such as width, straightness, and verticality), affecting its functionality, but may also lead to surface defects such as bulging and grout leakage at the wall edges due to instability in the formwork system.

[0004] Therefore, while the traditional segmented, skip-section construction process has solved the problem of formwork erection at expansion joints to some extent, it has also brought a series of problems and drawbacks. First, this process exhibits a significant linear sequence, preventing simultaneous work on different sections and resulting in a longer overall construction period. This drawback is particularly pronounced for projects with tight deadlines. Second, the long intervals between work steps lead to poor flexibility in construction organization, making it difficult to flexibly allocate and conduct parallel operations based on on-site resources (such as labor, formwork turnover materials, etc.), thus hindering further improvements in construction efficiency.

[0005] The root cause of the above problems lies in how to achieve simultaneous (or "one-time") molding of the concrete on both sides of the expansion joint while ensuring that the flexible infill material within the expansion joint maintains its designed position and shape during concrete pouring. This constitutes a technical challenge. The difficulty mainly lies in the fact that the flexible infill material itself lacks sufficient rigidity to directly withstand the lateral pressure of uncured concrete; if it is reinforced, the reinforcement measures must ensure that they do not affect the function of the joint and are easy to implement and fix within the formwork system, creating a contradiction in operation.

[0006] Therefore, there is an urgent need in this field for a construction technology or structural measure that can overcome the above-mentioned shortcomings, in order to effectively shorten the construction period and improve work efficiency while ensuring the construction quality of expansion joints in ultra-long concrete walls. Summary of the Invention

[0007] One object of this invention is to solve at least the aforementioned problems and / or defects, and to provide at least the advantages described below.

[0008] One objective of this invention is to solve the problem of long construction periods and poor molding quality caused by the inability to pour expansion joints on both sides simultaneously due to the easy deformation of flexible filling materials in traditional construction.

[0009] To achieve these objectives and other advantages according to the present invention, a one-time forming and jointing construction structure for ultra-long concrete walls is provided, including an expansion joint forming template. The expansion joint forming template includes an extruded polystyrene board and two plywood boards, wherein the two plywood boards are respectively pasted on both sides of the extruded polystyrene board, and steel reinforcement protective layer spacers are respectively attached to the outer sides of the two plywood boards.

[0010] Preferably, in the one-time molding and jointing construction structure for the ultra-long concrete wall, the thickness of the extruded polystyrene board is 15mm.

[0011] Preferably, in the one-time molding and jointed construction structure of the ultra-long concrete wall, the two plywood boards are fixed to both sides of the extruded polystyrene board by spot bonding.

[0012] Preferably, in the one-time molding and jointing construction structure of the ultra-long concrete wall, a mechanical interlocking structure is provided between the extruded polystyrene board and the plywood; the mechanical interlocking structure includes multiple protruding tenons provided on the side of the extruded polystyrene board, and mortises provided on the inner side of the plywood that are adapted to the position and shape of the tenons.

[0013] Preferably, in the one-time molding and jointed construction structure of the ultra-long concrete wall, the protruding tenon is made of elastic engineering plastic. The protruding tenon includes a rod and a head connected to one end of the rod. The head has an umbrella-shaped structure, and the outer diameter of the head is larger than the diameter of the rod. The head has multiple through-slits along the axial direction, which divide the head into multiple petals that can elastically retract inward. The mortise includes a first hole segment and a second hole segment. The first hole segment has an entrance on the side near the extruded board. The diameter of the first hole segment is equal to the diameter of the rod, and the diameter of the second hole segment is equal to the outer diameter of the head. The multiple petals are compressed and retract to pass through the entrance, through the first hole segment, and into the second hole segment. Under their own elasticity, they open outward to achieve mechanical interlocking between the protruding tenon and the mortise.

[0014] Preferably, in the one-time forming and jointing construction structure for the ultra-long concrete wall, the height of the rod is equal to that of the first hole segment, and the height of the head is equal to that of the second hole segment.

[0015] Preferably, in the one-time molding and jointing construction structure of the ultra-long concrete wall, the mortise has a guide chamfer at the entrance near the extruded board.

[0016] Preferably, in the one-time molding and jointed construction structure of the ultra-long concrete wall, the elastic engineering plastic is selected from one of nylon, thermoplastic polyurethane and polyether block amide.

[0017] Preferably, in the one-time molding and jointed construction structure of the ultra-long concrete wall, the multiple protruding tenons are evenly distributed in a rectangular array on the side of the extruded board.

[0018] This utility model has at least the following beneficial effects: This invention employs a composite formwork structure formed by bonding plywood to both sides of an extruded polystyrene (XPS) board, providing the flexible XPS board with a surface layer possessing sufficient strength and rigidity. This prevents the expansion joint formwork from deforming under the lateral pressure of poured concrete, effectively maintaining the designed width and shape of the expansion joint. Simultaneously, the composite structure, closely attached to the reinforcing steel protective layer spacers, enhances its stability within the formwork system, helping to reduce the risks of bulging and grout leakage, thereby ensuring the flatness and verticality of the wall concrete. Furthermore, this structure allows for parallel construction of wall sections on both sides of the expansion joint, changing the traditional method of requiring skip-construction work and providing a basis for shortening the overall construction period.

[0019] This invention establishes a reliable physical connection between extruded polystyrene (XPS) board and plywood through a mechanical interlocking structure consisting of protruding tenons and mortises. This method provides mechanical restraint superior to simple adhesive bonding, more effectively resisting the forces that could separate the two materials during concrete flow and vibration, thus improving the overall integrity of the composite formwork. The mechanical interlocking connection avoids the risk of adhesion failure due to aging or unsuitable construction environments that may occur with adhesives alone, enhancing the durability and reliability of the connection.

[0020] This invention utilizes a tenon with an umbrella-shaped head made of elastic engineering plastic, combined with mortises in first and second hole sections of different diameters, to achieve a convenient and reliable mechanical connection structure. Multiple lobes of the tenon head elastically close under pressure, passing through the first hole section and then rapidly opening in the second hole section to form a mechanical latch. This design reduces the requirements for installation precision and, through the surface contact between the outer wall of the tenon head and the inner wall of the second hole section, as well as the tight fit between the tenon and the first hole section, forms a dual constraint mechanism, effectively improving the stability and anti-loosening ability of the connection point. Simultaneously, the excellent fatigue resistance of the elastic engineering plastic ensures that the connection point can withstand multiple deformations during construction without failure.

[0021] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the one-time molding and jointed construction structure for ultra-long concrete walls in this utility model.

[0023] Figure 2 This is a schematic diagram of the mechanical interlocking structure in this utility model.

[0024] Figure 3 This is a structural diagram of the protruding tenon in the retracted state in this utility model.

[0025] Figure 4 This is a schematic diagram of the protruding tenon in this utility model. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0027] like Figures 1 to 4As shown, this utility model provides a one-time forming joint construction structure for ultra-long concrete walls, including an expansion joint forming template. The expansion joint forming template includes an extruded polystyrene board 1 and two plywood boards 2. The two plywood boards 2 are respectively pasted on both sides of the extruded polystyrene board 1, and the outer sides of the two plywood boards are respectively tightly attached with steel reinforcement protective layer spacers 3.

[0028] The expansion joint has four sections of the proposed wall at both ends.

[0029] This structure is mainly used in the construction of ultra-long reinforced concrete walls with expansion joints, such as walls or underground walls that are more than tens of meters long and require tongue-and-groove expansion joints.

[0030] Existing technologies typically employ a segmented construction method, known as the skip-pour method. Specifically, this involves first completing the concrete pouring and formwork removal for one wall segment between two adjacent expansion joints, before proceeding to the next segment. At the expansion joint location, extruded polystyrene (XPS) boards of the designed thickness are directly erected as infill material. This approach is intended to facilitate the support and propping of the soft XPS boards. However, due to the soft texture of XPS boards, they are easily deformed by the lateral pressure of the flowing concrete during pouring, resulting in localized bulging, twisting, or overall displacement. This leads to uneven width and irregular alignment of the finished expansion joints, affecting their functionality. Furthermore, because the formwork for subsequent segments cannot be erected until the first segment is removed, the construction cannot proceed synchronously, resulting in a prolonged overall construction period.

[0031] This utility model of an expansion joint forming template adopts a composite structure, with a layer of plywood glued to each of the two sides of the extruded polystyrene (XPS) board using adhesive. These two layers of plywood provide a relatively rigid surface support for the flexible XPS board. During installation, this composite template is placed at the designed location of the expansion joint, ensuring that the outer surfaces of the plywood on both sides are tightly against the concrete protective layer spacers on the outside of the already tied reinforcing bars. The protective layer spacers serve to position and provide initial support.

[0032] During implementation, the main formwork is erected simultaneously on both sides of the expansion joint, with the formwork on both sides tightly abutting the outer surface of the plywood composite formwork. Because the plywood surface is flat and has sufficient rigidity, it effectively transmits and balances the lateral pressure of the concrete through the protective layer pads and the main formwork system, thus significantly reducing the pressure directly borne by the extruded polystyrene board, keeping it stable in its designed position and less prone to deformation. This achieves simultaneous pouring of concrete on both sides of the expansion joint, i.e., one-time molding. This structure ensures the molding quality of the expansion joint, maintains its designed width and good alignment, while providing conditions for shortening the construction period.

[0033] The construction method of the one-time molding and jointed construction structure for ultra-long concrete walls of this utility model specifically includes the following steps: 1. The expansion joint filling material is 15mm thick extruded polystyrene board. Since the extruded polystyrene board is relatively soft, plywood is pasted on both sides of the extruded polystyrene board as the surface material to improve the surface strength and rigidity of the extruded polystyrene board.

[0034] 2. Cut the extruded polystyrene board and plywood to the dimensions of the expansion joint, and spot-attach the plywood to both sides of the extruded polystyrene board to ensure that the two do not separate during formwork erection.

[0035] 3. After the reinforcing bars on both sides of the expansion joint are tied, the extruded polystyrene board and plywood are filled into the expansion joint. The plywood is tightly attached to the reinforcing bar protective layer spacer to ensure that it is not easily deformed when pouring concrete.

[0036] Using this structure can ensure the quality of the joint formation of the concrete wall (ensuring flatness and verticality, preventing bulging and leakage of grout) and shorten the construction period.

[0037] Compared with existing technologies, this utility model achieves the following beneficial effects: 1. Improved construction efficiency: The one-time molding and jointing structure of the ultra-long concrete wall makes full use of the working space, allowing for free adjustment of construction sections according to construction resources, avoiding the limitations of traditional processes, greatly shortening the construction period, and improving construction efficiency. 2. Guaranteed construction quality: This structure can effectively control construction precision, facilitate the control of material reinforcement within expansion joints, ensure formwork stability, and reduce the impact of subsequent processes on the installation quality of materials within the joints. It ensures that the stress and deformation of the overall structure are controlled within a reasonable range during construction, guaranteeing the quality and stability of the building structure.

[0038] In a preferred embodiment, in the one-time molding and jointed construction structure of the ultra-long concrete wall, the thickness of the extruded polystyrene board is 15mm.

[0039] This invention utilizes a 15mm thick extruded polystyrene (XPS) board. During construction, the 15mm thick XPS board is combined with plywood on both sides. The presence of the plywood provides in-plane constraint for the XPS board, effectively suppressing its compressive deformation tendency under the lateral pressure of concrete. This allows the overall thickness of the composite formwork to remain stable during construction, thus leaving gaps for the flowing concrete on both sides. This design helps ensure that the actual width of the expansion joint after molding is closer to the design value, meeting the structural functional requirements for the width of the expansion joint.

[0040] In a preferred embodiment, in the one-time molding and jointed construction structure of the ultra-long concrete wall, the two plywood boards are fixed to both sides of the extruded polystyrene board by spot bonding.

[0041] In the closest existing technology, while bonding a rigid panel to the entire surface of an extruded polystyrene (XPS) board over a large area provides high bond strength, it also has some drawbacks. Firstly, full bonding requires a significant amount of adhesive, increasing material costs. Secondly, it creates a rigid, continuous interface between two materials with significantly different physical properties. Under varying ambient temperatures or uneven external forces, this continuous interface may experience stress concentration due to excessive constraint, posing a risk of localized damage to the XPS board or plywood. Furthermore, full bonding is time-consuming, impacting construction efficiency.

[0042] This invention employs a spot-bonding method to fix plywood to both sides of extruded polystyrene (XPS) board. Specifically, adhesive is applied to multiple dispersed points on the bonding surfaces of the plywood and XPS board, and the two are bonded together through these point-bonding areas. This point-distribution method provides sufficient adhesion and fixation for the plywood under normal construction conditions, preventing it from detaching from the XPS board during handling and installation, while also reducing the total amount of adhesive used. Simultaneously, the discontinuous connection interface formed by spot bonding allows the XPS board and plywood to have a certain degree of relative deformation capacity under the influence of factors such as temperature changes, helping to release some internal stress and reducing the possibility of damage due to excessive adhesive constraint.

[0043] In a preferred embodiment, in the one-time molding and jointing construction structure of the ultra-long concrete wall, a mechanical interlocking structure is provided between the extruded polystyrene board and the plywood; the mechanical interlocking structure includes a plurality of protruding tenons provided on the side of the extruded polystyrene board, and mortises provided on the inner side of the plywood that are adapted to the position and shape of the tenons.

[0044] Extruded polystyrene (XPS) boards and plywood are connected only by adhesives. Under long-term use or specific environmental conditions, their reliability may be affected by factors such as adhesive aging, moisture absorption, or the cleanliness of the construction interface. If the adhesive fails locally, the failed area may gradually expand under the continuous lateral pressure of the concrete, eventually causing the plywood to detach from the XPS board, affecting the quality of the expansion joint.

[0045] This invention provides a mechanical interlocking structure as a connection guarantee. The structure includes multiple protruding tenons pre-set on the side of the extruded polystyrene (XPS) board, and corresponding mortises on the inner side of the plywood. During installation, the mortises on the plywood are aligned with the tenons on the XPS board and fitted together. After the tenons enter the mortises, the physical constraints formed by their geometric shapes effectively limit the displacement of the plywood in the direction perpendicular to the board surface. This mechanical connection method is less affected by environmental factors, providing more stable connection reliability. The adhesive fixing connection and the interlocking structure together resist the forces that could separate them, thereby enhancing the integrity and durability of the composite formwork under complex construction conditions.

[0046] In a preferred embodiment, in the one-time molding and jointed construction structure of the ultra-long concrete wall, the protruding tenon is made of elastic engineering plastic. The protruding tenon includes a rod 5 and a head 6 connected to one end of the rod. The head has an umbrella-shaped structure, and the outer diameter of the head is larger than the diameter of the rod. The head 6 has multiple through-slits 10 along the axial direction, which divide the head into multiple petals 9 that can elastically retract inward. The mortise includes a first hole segment 7 and a second hole segment 8. The first hole segment 7 has an entrance on the side near the extruded board. The diameter of the first hole segment 7 is equal to the diameter of the rod, and the diameter of the second hole segment 8 is equal to the outer diameter of the head. The multiple petals are compressed and retract to pass through the entrance, through the first hole segment, and into the second hole segment. Under their own elasticity, they open outward to achieve mechanical interlocking between the protruding tenon and the mortise.

[0047] The structure includes a tenon protruding on the side of the extruded polystyrene board and a corresponding mortise on the inner side of the plywood. The tenon is made of elastic engineering plastic and consists of a rod and a head. The head is designed as an umbrella shape, with an outer diameter larger than the rod diameter. Multiple through-slits are formed along the axial direction of the head, dividing it into several lobes that can elastically close inwards. The mortise consists of a first hole segment and a second hole segment; the diameter of the first hole segment is approximately equal to the diameter of the rod, and the diameter of the second hole segment matches the outer diameter of the head.

[0048] During installation, align the mortises of the plywood with the tenons on the extruded polystyrene board and apply pressure. As the tenon head passes through the first perforation, the lobes are compressed and retract inward. When the head enters the second perforation, the lobes open outward due to the material's elasticity, returning to their umbrella-like shape. At this point, the open head is confined within the space of the second perforation, while the rod engages with the first perforation, achieving mechanical interlocking. This structure provides additional mechanical connections for the composite formwork, helping to improve connection reliability during construction.

[0049] The tenon head features an umbrella-shaped structure, combined with elastic flaps formed by multiple axial slots, allowing it to easily pass through the smaller diameter first hole during installation by contracting and deforming. This design reduces the requirements for installation alignment accuracy, allowing assembly to be completed even with minor dimensional deviations. This structure provides an effective and convenient mechanical connection method for composite formwork.

[0050] The protruding tenon and extruded polystyrene (XPS) board of this invention achieve a reliable connection through the following processing method. The protruding tenon is manufactured integrally using elastic engineering plastic through injection molding. During the production process or subsequent processing, mounting holes matching the shape and size of the tenon shank are opened at predetermined positions on the surface of the XPS board. During assembly, an appropriate amount of adhesive can be applied to the surface of the tenon shank or inside the mounting holes of the XPS board, and then the tenon shank is pressed into the mounting holes. An interference fit is used between the tenon shank and the mounting holes, generating sufficient friction through the tight contact between the materials. For tenons with radially protruding anchor heads, the corresponding mounting holes need to be machined to form anchor grooves that match their shape. During the pressing process, the anchor heads undergo elastic deformation, enter the anchor grooves, and return to their original shape, forming a mechanical anchor. This connection method combines the chemical bonding force provided by the adhesive, the friction force generated by the interference fit, and the mechanical locking force formed by the anchor structure, jointly ensuring the connection strength and reliability between the tenon and the XPS board.

[0051] In a preferred embodiment, in the one-time forming and jointing construction structure of the ultra-long concrete wall, the height of the rod is equal to that of the first hole segment, and the height of the head is equal to that of the second hole segment.

[0052] The height of the first hole section is set to be equal to the height of the tenon shank. This ensures that when the tenon is installed, its shank completely fills the space of the first hole section, helping to limit the tenon's wobble in the direction perpendicular to the board surface. Simultaneously, the height of the second hole section is set to be equal to the height of the tenon head. This provides just the right amount of space for the opened flaps of the head, allowing the outer surface of the opened flaps to make surface contact with the inner wall of the second hole section. This precise correspondence in height ensures that the head can fully open for effective locking, while also avoiding unnecessary gaps caused by mismatched component heights. This improves the tightness and stability of the interlocking state and makes the component dimensions more regular.

[0053] In this invention, the mortise is designed as a blind hole that does not penetrate the outer surface of the plywood. Because the bottom of the blind hole is closed, the tenon head is completely accommodated and confined inside the plywood.

[0054] In a preferred embodiment, in the one-time molding and jointing construction structure of the ultra-long concrete wall, the mortise has a guide chamfer at the entrance near the extruded board.

[0055] The entry edge of a mortise is typically a sharp right-angled edge. Several disadvantages can arise when the tenon head, particularly the lobes at its ends, contacts this sharp edge. Firstly, the sharp edge may hinder the lobes from smoothly initiating their inward contraction process, or even become stuck in the gaps between the lobes. Secondly, during the application of pressure to force the tenon in, the sharp edge may scratch or cut the surface of the tenon head's elastic material, potentially affecting the component's long-term lifespan.

[0056] This invention incorporates a guide chamfer at the entrance of the mortise near the extruded polystyrene board. This chamfer forms a tapered guide surface that smoothly transitions from the inner surface of the plywood to the first hole section. When the tenon head contacts this entrance, the guide chamfer provides a gentle guide for the initial retraction deformation of the head flaps, allowing them to retract more smoothly and regularly, rather than violently colliding with a right-angled edge. This reduces the risk of damage to the tenon head, making the assembly process easier and smoother, improving construction efficiency, and protecting the components.

[0057] In a preferred embodiment, in the one-time molding and jointed construction structure of the ultra-long concrete wall, the elastic engineering plastic is selected from nylon, thermoplastic polyurethane, and polyether block amide.

[0058] Ordinary plastics may lack sufficient elasticity, making them prone to plastic deformation or breakage after repeated opening and closing of the flaps. Some general-purpose elastomers may also lack sufficient strength or experience significant stress relaxation under long-term stress, leading to a decrease in locking force and affecting the long-term stability of the connection.

[0059] This invention utilizes elastic engineering plastics such as nylon, thermoplastic polyurethane, or polyether block amide. These materials combine excellent elastic recovery with high mechanical strength. Nylon provides high strength and abrasion resistance, thermoplastic polyurethane exhibits excellent toughness and elasticity, while polyether block amide excels in its superior fatigue resistance and flexibility. Tenons made from these materials can withstand multiple elastic deformations without breaking, and after locking, they maintain their shape and clamping force on the mortise for an extended period, thus ensuring the effectiveness and durability of the mechanical interlocking structure throughout the construction period.

[0060] In a preferred embodiment, in the one-time molding and jointed construction structure of the ultra-long concrete wall, the plurality of protruding tenons are evenly distributed in a rectangular array on the side of the extruded board.

[0061] A randomized layout may result in connection points being overly concentrated in some areas and relatively sparse in others. Under the lateral pressure of concrete, sparsely connected areas may become weak points, easily leading to significant local deformation or even separation between the plywood and extruded polystyrene board, affecting the straightness of the expansion joint. Furthermore, an irregular layout is detrimental to standardized component production and rapid on-site installation.

[0062] This invention arranges multiple protruding tenons evenly in a rectangular array on the side of the extruded polystyrene (XPS) board. This arrangement ensures that the connection points are regularly spaced on the template surface, maintaining uniform spacing in both the longitudinal and transverse directions. When the plywood is subjected to concrete pressure, this pressure can be evenly transmitted to the entire surface of the XPS board through the regularly distributed tenons, avoiding localized stress concentration, helping to maintain the flatness of the plywood surface, and thus ensuring the forming quality of the expansion joint.

[0063] Although embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be readily implemented by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and examples shown and described herein.

Claims

1. A one-time forming and jointing construction structure of an ultra-long concrete wall, comprising a expansion joint forming template, characterized in that, The expansion joint forming template includes an extruded polystyrene board and two plywood boards, wherein the two plywood boards are respectively pasted on both sides of the extruded polystyrene board, and the outer sides of the two plywood boards are respectively tightly attached with steel reinforcement protective layer spacers.

2. The one-time molding and jointed construction structure for ultra-long concrete walls according to claim 1, characterized in that, The thickness of the extruded board is 15mm.

3. The one-time molding and jointed construction structure for ultra-long concrete walls according to claim 1, characterized in that, The two plywood boards are fixed to both sides of the extruded board by spot bonding.

4. The one-time molding and jointed construction structure for ultra-long concrete walls according to claim 1, characterized in that, A mechanical interlocking structure is provided between the extruded polystyrene board and the plywood; the mechanical interlocking structure includes multiple protruding tenons provided on the side of the extruded polystyrene board, and mortises provided on the inner side of the plywood that are adapted to the position and shape of the tenons.

5. The one-time molding and jointed construction structure for ultra-long concrete walls according to claim 4, characterized in that, The tenon is made of elastic engineering plastic and includes a rod and a head connected to one end of the rod. The head has an umbrella-shaped structure, and its outer diameter is larger than that of the rod. The head has multiple through-slits along its axial direction, which divide the head into multiple petals that can elastically retract inward. The mortise includes a first segment and a second segment. The first segment has an entrance on the side near the extruded board. The diameter of the first segment is equal to the diameter of the rod, and the diameter of the second segment is equal to the outer diameter of the head. The multiple petals are compressed and retract to pass through the entrance, through the first segment, and into the second segment. Under their own elasticity, they open outward to achieve mechanical interlocking between the tenon and the mortise.

6. The one-time molding and jointed construction structure for ultra-long concrete walls according to claim 5, characterized in that, The height of the rod is equal to that of the first hole segment, and the height of the head is equal to that of the second hole segment.

7. The one-time molding and jointed construction structure for ultra-long concrete walls according to claim 6, characterized in that, The mortise has a guide chamfer at the entrance near the side of the extruded board.

8. The one-time molding and jointed construction structure for ultra-long concrete walls according to claim 5, characterized in that, The elastic engineering plastic is selected from one of nylon, thermoplastic polyurethane, and polyether block amide.

9. The one-time molding and jointed construction structure for ultra-long concrete walls according to any one of claims 4 to 8, characterized in that, The multiple protruding tenons are evenly distributed in a rectangular array on the side of the extruded board.

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