Block sandwich assembly type concrete test component and construction method thereof

Abstract

The invention belongs to the technical field of fabricated structures, and provides a block sandwich fabricated concrete test member and a construction method thereof. The test component comprises a foundation and a component main body; the foundation comprises a middle foundation part, two clamping piece edge foundation parts and two splicing layers, the middle foundation part is located on the lower portion of the component body and connected with the component body, and the middle foundation part and the component body are jointly poured; the two clamping piece edge base parts are respectively positioned on two sides of the middle base part; the splicing layer is arranged at the connecting position of the middle base part and the clamping piece edge base part; the foundation part, the clamping piece edge foundation part and the splicing layer are each provided with a horizontal steel bar pre-tightening hole channel, and the clamping piece edge foundation part, the splicing layer, the middle foundation part, the splicing layer and the clamping piece edge foundation part are sequentially connected and fastened into a whole in the mode that prestress connecting parts penetrate through the steel bar pre-tightening hole channels. The problems that a traditional construction method is large in formwork consumption, large in construction difficulty, high in construction cost and complex in process are solved.

Description

Technical Field

[0001] This application belongs to the technical field of prefabricated structures, and specifically relates to a segmented sandwich prefabricated concrete test component suitable for laboratory environments and its construction method. Background Technique

[0002] The casting of test reinforced concrete components is different from that of building components. The casting of building components pays more attention to construction efficiency and large-scale production. Generally, standardized processes are adopted, emphasizing the integrity of the structure and the continuity of construction. During construction, the overall structure is usually cast in situ or assembled after the main body of each component is cast. In contrast, test reinforced concrete components focus on the performance research of a single component. When casting, a special foundation needs to be set at the bottom of the component to cooperate with the loading device, and customized templates are used for special components. Test reinforced concrete components, also known as concrete test components, include the main body of the component and the foundation cast at the bottom of the main body of the component. In the traditional construction method of test reinforced concrete components, the foundation and the main body of the component are cast integrally, and the casting method is vertical casting. In a laboratory environment, construction workers need to clear a large enough working area and prepare a crane with sufficient lifting capacity.

[0003] The construction process of the existing construction method for test reinforced concrete components is as follows: (1) Bind the steel cages of the foundation and the main body of the component; (2) Assemble the foundation and component templates using steel molds or wooden molds; (3) First pour the concrete for the foundation part, and continuously pour the concrete for the main body of the component before the initial setting of the foundation; (4) Remove the molds and cure.

[0004] The above existing test reinforced concrete components currently have four construction difficulties: (1) Staged casting of the foundation and the main body of the component: Staged casting operations are carried out on the foundation and the main body of the component, and a vertical casting process is adopted. This process not only makes the operation of supporting the molds extremely complex and cumbersome, but also requires a large number of molds. At the same time, during the construction process, the construction quality is difficult to be effectively guaranteed.

[0005] (2) Restrictions on the test site: Usually, the demand for the test site is large. The overall casting of test reinforced concrete components requires a large amount of space and takes a long construction time.

[0006] (3) Serious material problems: In the existing test system, the foundation and the main body of the component are disposable consumable components, and their material utilization rate is low. After the test is completed, the foundation cannot be reused for a second time, resulting in a large amount of steel bars and concrete being directly discarded. The discarded concrete needs to be professionally crushed, and the steel bars need to be cut and recycled. The process is cumbersome and the waste treatment cost is high. At the same time, the discarded test reinforced concrete components occupy the limited space of the laboratory for a long time, which not only affects the subsequent test development but also increases the difficulty of site management, forming a double dilemma of resource waste and space occupation.

[0007] (4) Hoisting weight: Since the foundation and the main body of the cast-in-situ concrete test component are huge in volume, the problem of overweight may occur. The weight of the concrete test component far exceeds the rated lifting capacity of the conventional cranes in the laboratory, resulting in the need to rely on external professional hoisting equipment for collaborative operation during the test. This not only increases the equipment rental cost and construction period, but also further increases the complexity of construction organization due to the uncertainty of external crane scheduling and on-site coordination, affecting the test efficiency and safety. Summary of the Invention

[0008] In view of the deficiencies of the traditional construction method of reinforced concrete components for tests, this application provides a block sandwich precast concrete test component and its construction method, which solves the problems of large consumption of formwork, high construction difficulty, high construction cost, and complex process in the traditional construction method. The construction method adopted for the block sandwich precast concrete test component of this application abandons the traditional construction method of integral pouring of the foundation. The middle foundation part connected to the main body of the component is fixed in the middle by two clip-edge foundation parts, and a splicing layer is arranged between the clip-edge foundation part and the middle foundation part, and the force is transmitted through the friction force of the splicing layer. The clip-edge foundation part can be reused, reducing the construction cost. The main body of the component and the middle foundation part connected to it can be horizontally poured, reducing the construction difficulty and improving the construction quality.

[0009] A block sandwich precast concrete test component, comprising a foundation 1 and a component main body 2 cast on the foundation 1; The foundation 1 includes a middle foundation part 1-2, two clip-edge foundation parts 1-1 and two splicing layers 1-3, wherein: The middle foundation part 1-2 is located below the component main body 2 and is connected to the component main body 2. The middle foundation part 1-2 has the same width as the component main body 2 for joint pouring; The two clip-edge foundation parts 1-1 are respectively located on both sides of the middle foundation part 1-2; The splicing layer 1-3 is arranged at the connection position between the middle foundation part 1-2 and the clip-edge foundation part 1-1; the splicing layer uses concrete with coarser aggregate particles or rubber fiber materials to increase the friction force, and ensures the integrity of the splicing of the middle foundation part 1-2 and the two clip-edge foundation parts 1-1 under the application of test loads or displacements; The middle foundation part 1-2, the two clip-edge foundation parts 1-1 and the two splicing layers 1-3 are all provided with horizontal steel bar pre-tensioning channels 1-4, and the channel positions correspond. The clip-edge foundation part 1-1, the splicing layer 1-3, the middle foundation part 1-2, the splicing layer 1-3 and the clip-edge foundation part 1-1 are connected and fastened into a whole through the prestressed connection member 1-7 passing through the steel bar pre-tensioning channels 1-4.

[0010] The construction method of the above-mentioned segmented sandwich precast concrete test component includes the following steps: S1: Construction of the jaw edge foundation part; S2: Construction of the component main body and the middle foundation part, and pouring the component main body and the middle foundation part into a whole; S3: Use a crane to lift the jaw edge foundation part, the component main body and the middle foundation part to the designated test position respectively. Add a splicing layer between the jaw edge foundation part and the middle foundation part, and use prestressed connecting components to connect and fasten the jaw edge foundation part, the splicing layer, the middle foundation part connected to the component main body, the splicing layer, and the jaw edge foundation part in sequence.

[0011] Compared with the prior art, the present application has the following beneficial effects: The jaw edge foundation part can be reused, and the shapes of the component main body and the middle foundation part are regular, reducing the consumption of reinforced concrete and formwork; The widths of the component main body and the middle foundation part are the same, and they can be poured horizontally and completed in one pouring. The pouring method is convenient, the construction quality is high, and it meets the strict and fine requirements of test components; After the test component is segmented, it can be placed in segments, and only the component main body and the middle foundation part need to be discarded after the test, avoiding the dilemma that irregular components occupy a large test site; The overall test component can be hoisted in segments, the single lifting weight is light, and it does not rely on external professional hoisting equipment, reducing the construction cost and shortening the construction period; The present application can be applied to the construction methods of most test components and has good universality. Description of the Drawings

[0012] Figure 1 It is a structural schematic diagram of the concrete test component in the embodiment of the present application.

[0013] Figure 2 It is an assembly schematic diagram of the concrete test component in the embodiment of the present application.

[0014] Figure 3 It is a top view of the structural reinforcement of the concrete test component in the embodiment of the present application.

[0015] Figure 4 It is a front view of the structural reinforcement of the concrete test component in the embodiment of the present application.

[0016] Figure 5 It is a side view of the structural reinforcement of the concrete test component in the embodiment of the present application.

[0017] Figure 6 It is a schematic diagram of replacing the component main body in the embodiment of the present application.

[0018] Figure 7 This is a schematic diagram of the principle of the concrete test component of this application.

[0019] The labels in the figure are explained as follows: 1. Foundation; 1-1. Foundation part at the jaw side; 1-2. Middle foundation part; 1-3. Splice layer; 1-4. Reinforcement pre-tensioning duct; 1-5. Lifting ring; 1-6. Anchor duct; 1-7. Prestressed connection component; 1-1-1. Foundation longitudinal reinforcement; 1-1-2. Foundation stirrup; 2. Component main body; 2-1. Beam longitudinal reinforcement; 2-2. Beam stirrup. Specific implementation mode

[0020] The technical solution provided by this application will be further described below in conjunction with specific embodiments and their accompanying drawings. In combination with the following description, the advantages and features of this application will become clearer.

[0021] Embodiment This embodiment provides a segmented sandwich precast concrete test component and its construction method, which can reduce construction difficulties, reduce the demand for formwork, and reduce construction costs.

[0022] As Figure 1 , Figure 2 , Figure 3 shown, a segmented sandwich precast concrete test component includes a foundation 1 and a component main body 2 cast on the foundation 1.

[0023] The component main body 2 includes, but is not limited to, structural components such as beams, columns, and walls. In this embodiment, the component main body is a beam.

[0024] The foundation 1 includes a middle foundation part 1-2, two foundation parts 1-1 at the jaw sides, and two splice layers 1-3, where: The middle foundation part 1-2 is located below the component main body 2 and is connected to the component main body 2. The middle foundation part 1-2 has the same width as the component main body 2 for joint pouring; The two foundation parts 1-1 at the jaw sides are respectively located on both sides of the middle foundation part 1-2; The splice layer 1-3 is arranged at the connection position between the middle foundation part 1-2 and the foundation part 1-1 at the jaw side; The middle foundation part 1-2, the two foundation parts 1-1 at the jaw sides, and the two splice layers 1-3 are all provided with horizontal reinforcement pre-tensioning ducts 1-4, and the duct positions correspond. The prestressed connection component 1-7 passes through the reinforcement pre-tensioning ducts 1-4 to connect and fasten the foundation part 1-1 at the jaw side, the splice layer 1-3, the middle foundation part 1-2, the splice layer 1-3, and the foundation part 1-1 at the jaw side into a whole.

[0025] Furthermore, the splicing layer is made of concrete with coarser aggregate particles or rubber fiber material to increase the friction force, ensuring the integrity of the splicing of the middle foundation part 1-2 and the two clip-edge foundation parts 1-1 under the application of test loads or displacements. The splicing layer is a replaceable component. Based on the assembly method of the splicing layer, the concrete test component can be easily disassembled after the test, retaining the clip-edge foundation parts 1-1 on both sides, and the clip-edge foundation parts 1-1 can be reused, reducing material waste. Subsequently, the component body and the middle foundation part 1-2 connected thereto can be replaced, and the concrete test component can be reassembled.

[0026] Furthermore, the prestressed connection component is a prestressed tendon or a screw.

[0027] Specifically, as Figure 3 shown, the clip-edge foundation part 1-1 is formed by concrete casting, and foundation longitudinal bars 1-1-1 and foundation stirrups 1-1-2 are arranged therein.

[0028] Specifically, as Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 shown, the middle foundation part 1-2 and the component body 2 are formed into a whole by concrete casting; foundation longitudinal bars 1-1-1 and foundation stirrups 1-1-2 are arranged in the middle foundation part 1-2; beam longitudinal bars 2-1 and beam stirrups 2-2 are arranged in the component body 2, and the beam longitudinal bars 2-1 extend into the middle foundation part 1-2 for anchoring.

[0029] Furthermore, lifting rings 1-5 are provided on the upper surfaces of the middle foundation part 1-2 and the two clip-edge foundation parts 1-1, as well as at the top of the component body, for easy lifting and transportation of the test component.

[0030] Furthermore, vertical ground anchor holes 1-6 are provided in the middle foundation part 1-2 and the clip-edge foundation part 1-1 for anchoring the foundation to the ground or the reaction frame during the test.

[0031] During the experiment, the component body may be damaged after the test component is used. As Figure 6 shown, after the test, only the component body and the middle foundation part 1-2 connected thereto need to be replaced, retaining the clip-edge foundation parts 1-1 on both sides, and the clip-edge foundation parts 1-1 can be reused, reducing material waste.

[0032] The clamping edge foundation part applies normal pressure to the splicing surface through prestressed connection components (prestressed tendons or screws), sandwiching the middle foundation part with the component body in the middle. The splicing layer is made of high friction material. The clamping edge foundation and the middle foundation part with the component body are anchored to the reaction frame or the ground through ground anchors. Figure 7 As shown in the figure, during the test loading process, the actuator applies load or displacement to the top of the test component. Under the action of the actuator, the test component tends to rotate around the bottom of the foundation. The ground anchor and the splicing layers on both sides provide friction to limit the rotation of the test component. The rotation equilibrium equation is shown as follows: FH = TL + 2f·0.5L Where F is the force applied by the actuator at the end of the test component; H is the distance from the center of the force to the bottom surface of the foundation; T is the pull-out resistance provided by the anchor; f is the friction force of the single splicing layer on the intermediate foundation, and the friction force can be assumed to be uniformly distributed on the splicing surface; L is the foundation length.

[0033] The construction method of the above-mentioned block sandwich assembled concrete test member includes the following steps: S1: Construction of the foundation part of the clip edge; specifically including: S11: The reinforcement cage of the foundation part beside the binding clip, including the foundation longitudinal reinforcement 1-1-1 and the foundation stirrup 1-1-2; S12: Lay the steel cage flat, cut the side formwork and bottom formwork for supporting the foundation part of the clip side, and fix them with tension screws; S13: Preserve vertical PVC pipes, horizontal PVC pipes, and hanging points in the base portion of the clip edge and secure them to the steel cage; the vertical PVC pipes and horizontal PVC pipes are used to form vertical anchor holes 1-6 and horizontal steel pre-tightening holes 1-4, respectively; S14: After sealing the PVC pipe, pour concrete and vibrate to compact it. After the concrete solidifies, remove the formwork and carry out curing until it reaches the specified strength; S15: After the foundation part of the clip edge reaches the specified strength, it is lifted to the test reaction frame by a crane.

[0034] S2: Construction of the main body of the component and the middle foundation, casting the main body of the component and the middle foundation into a whole; specifically including: S21: Tie and secure the steel cages of the foundation and component body; S22: Lay the steel cage flat, cut the side formwork and bottom formwork of corresponding sizes, and fix them with tension screws; S23: PVC pipes and lifting points are reserved in the middle foundation to form holes for ground anchors and pre-tightening screws and are fixed to the steel cage. Lifting points are embedded at the top of the component to facilitate flipping the component during lifting. Strain gauges are also attached at the required testing locations. S24: After sealing the PVC pipe, pour concrete and vibrate it until it is dense. After the concrete solidifies, remove the formwork and cure it until the specified strength is reached; S25: After the main body of the component and the middle foundation part reach the specified strength, lift them to the test reaction frame by a crane; S3: Splice the clip-side foundation part and the middle foundation part connected to the main body of the component: Select a rubber sheet with high friction performance as the splicing layer, and set a steel bar pre-tightening hole in the splicing layer; Set the splicing layer at the splicing surface of the clip-side foundation part and the middle foundation part, and then pass the screw applying the pre-tightening force through the steel bar pre-tightening hole to connect the clip-side foundation part, the splicing layer, the middle foundation part connected to the main body of the component, the splicing layer and the clip-side foundation part in sequence, and apply pre-tension at both ends of the screw to fasten the clip-side foundation part, the splicing layer and the middle foundation part connected to the main body of the component together. Finally, fix the foundation on the reaction frame through ground anchors.

[0035] For different test component cases, the pre-tightening force can be comprehensively calculated according to the loads borne by different test components.

[0036] Furthermore, the clip-side foundation part 1-1 is designed to be relatively narrow, and the reinforcement can be arranged according to the beam component. The clip-side foundation part 1-1 is poured independently.

[0037] Furthermore, the width of the middle foundation part 1-2 is the same as the width of the main body of the component 2. When pouring concrete, the middle foundation part 1-2 and the main body of the component 2 can be placed flat on the ground and poured together.

[0038] The above description is only a description of the preferred embodiment of the present application, and is not any limitation on the scope of the present application. Any change or modification made by any person skilled in the art according to the disclosed technical content shall be regarded as an equivalent effective embodiment, and all belong to the scope protected by the technical solution of the present application.

Claims

1. A block sandwich precast concrete test component, characterized in that It includes a foundation (1) and a component main body (2) cast on the foundation (1); The foundation (1) includes a middle foundation part (1-2), two clamping-edge foundation parts (1-1) and two splicing layers (1-3), where: The middle foundation part (1-2) is located below the component main body (2) and is connected to the component main body (2). The middle foundation part (1-2) has the same width as the component main body (2) for joint casting; The two clamping-edge foundation parts (1-1) are respectively located on both sides of the middle foundation part (1-2); The splicing layer (1-3) is arranged at the connection position between the middle foundation part (1-2) and the clamping-edge foundation part (1-1); the splicing layer uses concrete with coarser aggregate particles or rubber fiber materials to increase the friction force, and to ensure the integrity of the splicing of the middle foundation part (1-2) and the two clamping-edge foundation parts (1-1) under the application of test loads or displacements; The middle foundation part (1-2), the two clamping-edge foundation parts (1-1) and the two splicing layers (1-3) are all provided with horizontal steel bar pre-tightening channels (1-4), and the channel positions correspond. The clamping-edge foundation part (1-1), the splicing layer (1-3), the middle foundation part (1-2), the splicing layer (1-3) and the clamping-edge foundation part (1-1) are connected and fastened into a whole in sequence through a prestressed connection component (1-7) passing through the steel bar pre-tightening channels (1-4).

2. The precast concrete test member with segmented sandwich as claimed in claim 1, wherein, The prestressed connection component (1-7) is a prestressed tendon or a screw rod.

3. The precast concrete test member with segmented sandwich structure according to claim 1, characterized in that, The clamping-edge foundation part (1-1) is formed by concrete casting, and foundation longitudinal bars (1-1-1) and foundation stirrups (1-1-2) are arranged therein.

4. The precast concrete test member with a segmented sandwich structure according to claim 1, characterized in that, The middle foundation part (1-2) and the component main body (2) are cast into a whole by concrete; foundation longitudinal bars (1-1-1) and foundation stirrups (1-1-2) are arranged in the middle foundation part (1-2); beam longitudinal bars (2-1) and beam stirrups (2-2) are arranged in the component main body (2), and the beam longitudinal bars (2-1) extend into the middle foundation part (1-2) for anchoring.

5. The precast concrete test member with a segmented sandwich structure according to claim 1, wherein, Lifting rings (1-5) are arranged on the upper surfaces of the middle foundation part (1-2) and the two clamping-edge foundation parts (1-1), as well as at the top of the component main body, so as to facilitate the lifting and transportation of the test component.

6. The precast concrete test member with a segmented sandwich structure according to claim 1, wherein, The middle foundation part (1-2) and the clamping-edge foundation part (1-1) are provided with vertical ground anchor channels (1-6) for anchoring the foundation to the ground or the reaction frame during the test.

7. A construction method for a segmented sandwich precast concrete test component as described in claim 1, characterized in that, The construction method includes the following steps: S1: Construction of the clamping-edge foundation part; S2: Construction of the component main body and the middle foundation part, and casting the component main body and the middle foundation part into a whole; S3: Use a crane to lift the clamping-edge foundation part, the component main body and the middle foundation part to the designated test position respectively. Add a splicing layer between the clamping-edge foundation part and the middle foundation part, and connect and fasten the clamping-edge foundation part, the splicing layer, the middle foundation part connected to the component main body, the splicing layer and the clamping-edge foundation part in sequence through the prestressed connection component.

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