Narrow-diameter expansion joint formwork reinforcing and shaping device
By installing a threaded connection device with a sleeve and screw rod on the extruded polystyrene (XPS) board, the problem of XPS board shifting during concrete pouring was solved, achieving stable positioning of the XPS board and ensuring the construction quality and safety of the building wall expansion joints.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGXIA FIFTH CONSTR CO LTD
- Filing Date
- 2025-04-02
- Publication Date
- 2026-05-19
AI Technical Summary
At the expansion joints of building walls, extruded polystyrene boards are prone to shifting due to buoyancy or compression during concrete pouring, leading to structural instability and affecting construction quality and safety.
A narrow-diameter expansion joint template with a fixing device is used, including an installation sleeve, a first steel plate, a threaded rod, and a reinforcement unit. Through threaded connection and positioning reinforcement, it is ensured that the extruded board is not easily displaced or deformed during the pouring process.
This improved the stability of the extruded polystyrene board, reduced the risk of displacement and deformation during the pouring process, and ensured construction quality and safety.
Smart Images
Figure CN224259888U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of building construction technology, and in particular to a narrow-diameter expansion joint template with fixing device. Background Technology
[0002] In the main construction phase of buildings exceeding 40 meters in height, extruded polystyrene (XPS) boards are typically installed within the expansion joints of the walls. These XPS boards can be used as temporary support formwork during concrete pouring, and do not need to be removed after the expansion joints are filled, eliminating the need for subsequent insulation material filling. Simultaneously, XPS boards effectively absorb the expansion and contraction energy caused by temperature changes, settlement, or earthquakes, reducing shear damage to the wall structure. However, XPS boards have a relatively low density; for example, a common type of XPS board has a density of 32 kg / m³, while the density of ordinary concrete can reach 2000 kg / m³. 3 This means that the concrete exerts a significant buoyancy force on the extruded polystyrene (XPS) board during pouring. Even with pressure applied at the top, a certain height of pure concrete structure will remain at the bottom of the final wall, which can compromise the design function of the expansion joint and create structural safety hazards. Furthermore, if concrete pouring begins from one side of the XPS board, or if pouring is done simultaneously from both sides but one side is poured too quickly, the XPS board will shift due to the pressure from the side with more concrete, causing localized dimensional deformation of the wall and affecting the final construction quality. Utility Model Content
[0003] This application provides a narrow-diameter expansion joint template with a fixing device, which can improve the stability of extruded polystyrene board and reduce the risk of deformation during the pouring of building expansion joints.
[0004] The above-mentioned objective of this application is achieved through the following technical solution:
[0005] A narrow-diameter expansion joint template with a fixing device includes an installation sleeve disposed on an extruded polystyrene board. The installation sleeve penetrates the extruded polystyrene board and has internal threads. A first steel plate is fixedly sleeved at each end of the installation sleeve, and the two first steel plates abut against the corresponding surfaces of the extruded polystyrene board.
[0006] A lead screw is inserted into the mounting sleeve and the two are threaded together. A reinforcing unit is provided at each end of the lead screw. The lead screw can position and reinforce the templates on both sides of the extruded board in the thickness direction through the reinforcing units at both ends.
[0007] Furthermore, the reinforcing unit includes two second steel plates, both of which are fixedly mounted on the screw rod. The two second steel plates, which are far apart from each other, abut against the inner sides of the templates on both sides of the thickness direction of the extruded board. A clamp is also fitted on the screw rod on the outer side of the templates on both sides of the thickness direction of the extruded board. A fastening nut is provided on the outer side of the clamp, and the fastening nut is threadedly connected to the screw rod.
[0008] Furthermore, the first steel plate has a cross-section of 50mm × 50mm square, and the second steel plate has a cross-section of 30mm × 30mm square.
[0009] Furthermore, the thickness of both the first steel plate and the second steel plate is 3mm.
[0010] Furthermore, the external thread diameter of the lead screw and the internal thread diameter of the mounting sleeve are both 12mm.
[0011] Furthermore, the first steel plate is fixed to the mounting sleeve by welding, and the second steel plate is fixed to the lead rod by threaded connection.
[0012] Furthermore, the lead screw is composed of two independent parts of equal length, namely a first rod and a second rod. The threads on the first rod and the second rod are in opposite directions. The direction of one half of the internal thread in the mounting sleeve is the same as the direction of the external thread on the first rod, and the direction of the other half of the internal thread in the mounting sleeve is the same as the direction of the external thread on the second rod.
[0013] In summary, this application includes at least one of the following beneficial technical effects:
[0014] When constructing expansion joints in building walls, installation sleeves can be pre-embedded in extruded polystyrene (XPS) boards. Then, a first steel plate is fixedly installed at each end of the installation sleeve. This allows the installation sleeve to become an integral part of the XPS board under the limiting effect of the first steel plate. Next, the XPS board can be placed at the designed expansion joint location. The threaded rod is passed through one of the installation sleeves on the XPS board. When the lengths of the threaded rod at both ends of the XPS board are close, the positions of the two ends of the wall thickness direction are marked on the threaded rod, referring to the actual wall thickness to be poured at the expansion joint. Then, the outer templates on both sides of the XPS board thickness direction are fitted onto the two ends of the threaded rod. The reinforcement units on the threaded rod are used to position and reinforce the module. This not only ensures that the XPS board is not easily displaced or deformed during the pouring process due to the limitation of the threaded rod, but also reduces the risk of the template running away due to vibration during the pouring process. Attached Figure Description
[0015] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a schematic diagram of the overall structure of this application (where the lead screw is a single rod integrally formed).
[0017] Figure 2 Is Figure 1 Based on this, the usage diagram is shown when it is applied to building expansion joints;
[0018] Figure 3 This is a schematic diagram showing the state of the first and second rods before they are inserted into the internal threaded sleeve on the extruded board when the lead screw of this application is composed of two independent first rods and second rods.
[0019] Figure 4 Is Figure 3 Based on this, we can use it in the application diagram of building expansion joints.
[0020] Reference numerals: 1. Extruded polystyrene board; 2. Mounting sleeve; 3. First steel plate; 4. Screw rod; 41. First rod; 42. Second rod; 5. Reinforcing unit; 51. Second steel plate; 52. Clamp; 53. Fastening nut; 6. Template; 7. Steel pipe. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.
[0022] like Figure 1 and Figure 2 As shown, this application discloses a narrow-diameter expansion joint template with a fixing device, which includes an installation sleeve 2 set on an extruded polystyrene board 1. The installation sleeve 2 penetrates the extruded polystyrene board 1 and has internal threads. A first steel plate 3 is fixedly fitted at both ends of the installation sleeve 2. The two first steel plates 3 approach each other and abut against the surface of the extruded polystyrene board 1 on the corresponding side.
[0023] A lead screw 4 is inserted into the mounting sleeve 2 and the two are threaded together. A reinforcing unit 5 is provided at each end of the lead screw 4. The lead screw 4 can position and reinforce the templates 6 on both sides of the extruded board 1 in the thickness direction through the reinforcing units 5 at both ends.
[0024] In the above embodiments, during the construction of expansion joints in building walls, holes can be drilled evenly on the extruded polystyrene board 1, and installation sleeves 2 can be pre-embedded in these holes. The two ends of the installation sleeves 2 extend slightly beyond the extruded polystyrene board 1, and the length of the extended part is preferably close to the thickness of the first steel plate 3. After the first steel plate 3 is fitted onto the installation sleeves 2, one side of the thickness direction of the first steel plate 3 can make good contact with the surface of the extruded polystyrene board 1. After a first steel plate 3 is fixedly installed at each end of the installation sleeve 2, the distance between the two first steel plates 3 is the thickness of the extruded polystyrene board 1. In this way, during the pouring process, the first steel plate 3 can not only provide a certain support and reinforcement effect for the extruded polystyrene board 1, but also prevent the installation sleeves 2 inserted on the extruded polystyrene board 1 from separating from the extruded polystyrene board 1 during concrete pouring by limiting the position of the extruded polystyrene board 1. That is, the installation sleeves 2 become a whole with the extruded polystyrene board 1 under the limiting effect of the first steel plate 3. After the position of the installation sleeves 2 is fixed, the position of the extruded polystyrene board 1 can be fixed accordingly. Next, the worker places the extruded polystyrene board 1 at the center of the expansion joint location designed in the drawings. The threaded rods 4 are then passed through the mounting sleeves 2 on the extruded polystyrene board 1 one by one. Since the threaded rods 4 on each mounting sleeve 2 are used in the same way, only one threaded rod 4 will be described as an example here. Because the outer side of the threaded rod 4 has an internal thread that matches the mounting sleeve 2, after inserting one end of the threaded rod 4 into the mounting sleeve 2, the worker can continue to advance the threaded rod 4 by screwing it into the mounting sleeve 2. When the lengths at both ends of the extruded polystyrene board 1 are close, the actual wall thickness to be poured at the expansion joint is considered at both ends of the threaded rod 4. The positions of both ends of the wall thickness direction are marked on the upper part. Then, the outer templates 6 on both sides of the extruded polystyrene board 1 in the thickness direction are fitted onto the two ends of the threaded rod 4. The reinforcement units 5 on the threaded rod 4 are used to position and reinforce the module. In this way, the template 6, the threaded rod 4, and the extruded polystyrene board 1 can form a temporary integral structure. During the subsequent pouring process, the threaded connection between the threaded rod 4 and the sleeve 2 installed in the extruded polystyrene board 1 ensures that the wall expansion joint is difficult to easily deviate or deform under the restriction of the threaded rod 4. This effectively solves the safety and building quality problems that may be caused by the expansion joint of the building wall during the pouring process. With the combined action of the outer supporting steel pipe 7 (in the case of cast-in-place concrete walls, supporting steel pipes are usually installed on the outside of the template to stabilize it) and the inner threaded rod 4, the risk of the template 6 running away due to vibration during the pouring process can be reduced. In addition, when constructing shear walls with low waterproofing requirements, a plastic sleeve can be fitted over the outside of the threaded rod 4. After construction is completed, the threaded rod 4 can be pulled out of the plastic sleeve for reuse. After the threaded rod 4 is removed from the wall, the sleeve hole can be sealed by workers, which can reduce construction costs.
[0025] Furthermore, such as Figure 1 and Figure 2As shown, the reinforcement unit 5 includes two second steel plates 51, both of which are fixedly mounted on the screw rod 4. The two second steel plates 51 are respectively abutted against the inner sides of the templates 6 on both sides of the thickness direction of the extruded board 1. A clamp 52 is also respectively fitted on the screw rod 4 on the outer side of the templates 6 on both sides of the thickness direction of the extruded board 1. A fastening nut 53 is provided on the outer side of the clamp 52, and the fastening nut 53 is threadedly connected to the screw rod 4.
[0026] In the above embodiments, after the threaded rod 4 and the extruded polystyrene board 1 are installed, the worker can mark the positions of both ends of the wall thickness direction on both ends of the threaded rod 4 with reference to the actual wall thickness to be poured at the expansion joint, and weld the second steel plate 51 at these two positions. At this time, the second steel plate 51 can also achieve the positioning effect of the wall module to be poured. The templates 6 on both sides of the wall thickness direction to be poured are respectively fitted onto both ends of the threaded rod 4, and the sides of the templates 6 that are close to each other are in contact with the sides of the two second steel plates 51 that are far from each other. At this time, the distance between the templates 6 on both sides of the extruded polystyrene board 1 is exactly the thickness of the entire wall to be poured. After the templates 6 are placed, the support steel pipes 7 are installed on the outside of the templates 6. For further reinforcement, the portion of the screw rod 4 extending out of the template 6 can be secured to the supporting steel pipe 7 on the outside of the template 6 via the clamp 52. After the clamp 52 is tightly attached to the surface of the supporting steel pipe 7, the fastening nut 53 located on the outside of the clamp 52 on the screw rod 4 is tightened. This allows the extruded polystyrene board 1 to form an integral structure with the mold through the reinforcement and fixing device of this application. When concrete is poured inside the template 6, the screw rod 4 ensures that the extruded polystyrene board 1 will not easily float or be squeezed by the concrete and deform significantly. At the same time, when the concrete exerts pressure on the extruded polystyrene board 1, the extruded polystyrene board 1 can also transfer this force to the template 6 through the screw rod 4, working in conjunction with the supporting steel pipe 7 on the outside of the template 6 to reduce the risk of the template 6 running away during pouring. The positioning and support function of the second steel plate 51 for the template 6 can also effectively prevent the template 6 from shrinking in size due to over-reinforcement during the reinforcement process.
[0027] Furthermore, the first steel plate 3 has a cross-section of 50mm × 50mm square, and the second steel plate 51 has a cross-section of 30mm × 30mm square.
[0028] In the above embodiments, the first steel plate 3 mainly acts on the extruded polystyrene board 1. However, the extruded polystyrene board 1 is significantly softer than the template 6. Therefore, this application sets the first steel plate 3 as a larger square steel plate. During concrete pouring, the first steel plate 3 can protect more areas of the extruded polystyrene board 1, and when the first steel plate 3 is impacted by concrete, the impact force is evenly distributed, reducing the local pressure on the extruded polystyrene board 1. The second steel plate 51 of this application mainly acts on the template 6 located on the outside of the wall to be poured. The commonly used metal template 6 has relatively high strength, and the second steel plate 51 is mainly used to position the distance between templates 6. Therefore, this application sets the second steel plate 51 as a square steel plate with a smaller size than the first steel plate 3. This reduces the amount of steel used compared to setting it to the same size as the first steel plate 3. Both the first steel plate 3 and the second steel plate 51 of this application adopt a square structure, allowing workers to easily cut and manufacture them from a steel plate of uniform thickness using cutting tools.
[0029] Furthermore, the thickness of both the first steel plate 3 and the second steel plate 51 is 3mm.
[0030] In the above embodiments, the first steel plate 3 and the second steel plate 51 of this application have the same thickness, so that the first steel plate 3 and the second steel plate 51 can be cut from the same steel plate.
[0031] Furthermore, the first steel plate 3 is fixed to the mounting sleeve 2 by welding, and the second steel plate 51 is fixed to the lead screw 4 by threaded connection.
[0032] In the above embodiments, the first steel plate 3 and the mounting sleeve 2 remain in the middle of the wall along with the extruded polystyrene board 1 after the wall is poured. Therefore, this application uses a stable welding method to fix the first steel plate 3 and the mounting sleeve 2. However, the second steel plate 51 will be located on the surface of the wall after the formwork 6 is removed after the wall is poured. This will affect the overall appearance of the wall. Moreover, the second steel plate 51 is prone to rust when exposed to water, which will also have an adverse effect on the quality of the wall. Therefore, it is necessary to remove the second steel plate 51 from the wall after the wall pouring is completed. If the wall at the expansion joint has high waterproofing requirements, the worker can remove part of the concrete around the first steel plate 3 after demolding. Since the second steel plate 51 and the threaded rod 4 are threadedly connected, the worker can more easily unscrew the second steel plate 51 from the threaded rod 4 by rotating it compared to welding. After removing the second steel plate 51, the worker can use a cutting tool to cut off the threaded rod 4 exposed on the outside of the wall and seal the missing part of the wall with mortar of the same proportion as the wall. If the waterproofing requirements of the wall at the expansion joint are not very high, workers can put an isolation sleeve on the part of the threaded rod 4 located on the first steel plate 3 and the second steel plate 51 during the initial installation of the threaded rod 4. After the subsequent wall construction is completed and the formwork 6 on the outside of the wall is removed, since the threaded rod 4, the installation sleeve 2, and the second steel plate 51 are all threaded connections, and the isolation sleeve isolates the concrete from the threaded rod 4 during the concrete pouring process, workers can use a special tool to turn the threaded rod 4 to pull it out of the concrete wall. Then, the second steel plate 51 can be removed from the concrete in the first way. At this time, the holes inside the wall can be filled with polyurethane foam sealant, and the gaps at both ends of the wall can be sealed with mortar of the same proportion as the wall.
[0033] Furthermore, such as Figure 3 and Figure 4 As shown, the lead screw 4 is composed of two independent parts of equal length. These two independent parts are the first rod 41 and the second rod 42. The threads on the first rod 41 and the second rod 42 are opposite in direction. The direction of one half of the internal thread in the mounting sleeve 2 is the same as the direction of the external thread on the first rod 41, and the direction of the other half of the internal thread in the mounting sleeve 2 is the same as the direction of the external thread on the second rod 42.
[0034] In the above embodiments, the lead screw 4 of this application is configured as two first rods 41 and second rods 42 of equal length. Each of the first rods 41 and the second rod 42 is provided with a second steel plate 51, a clamp 52 and a fastening nut 53. Compared with the integrally formed lead screw 4, two workers can install it simultaneously from both sides of the extruded board 1, which can improve the installation efficiency of the lead screw 4. Furthermore, the internal thread inside the threaded sleeve is divided into two parts, with the thread directions of these two parts being exactly opposite and corresponding to the external threads on the first rod 41 and the second rod 42, respectively. Thus, when the worker screws the first rod 41 or the second rod 42 into the mounting sleeve 2, if the worker encounters a situation where it cannot be screwed in, it means that the end of the first rod 41 or the second rod 42 has just reached the middle position of the mounting sleeve 2 (i.e., the junction of the threads with different directions inside the mounting sleeve 2). This allows for convenient and quick positioning of the extruded board 1 in the middle area of the lead screw 4, while also preventing the first rod 41 or the second rod 42 from being screwed in too deeply into the mounting sleeve 2 inside the extruded board 1.
[0035] The implementation principle of this embodiment is as follows: When constructing at the expansion joint of a building wall, the worker first drills holes in the extruded polystyrene board 1 according to the design position. Then, the installation sleeves 2 are inserted into these holes one by one. A first steel plate 3 is then welded to both ends of each installation sleeve 2. Thus, the installation sleeve 2 becomes an integral part of the extruded polystyrene board 1 under the limiting action of the first steel plate 3. Next, the worker places the extruded polystyrene board 1 in the middle of the expansion joint and passes the prepared threaded rods 4 through the installation sleeves 2 on the extruded polystyrene board 1 one by one. Since the outer side of the threaded rod 4 has an internal thread that matches the installation sleeve 2, after one end of the threaded rod 4 is inserted into the installation sleeve 2, the worker can continuously advance the threaded rod 4 by screwing it into the installation sleeve 2. When the lengths at both ends of the extruded polystyrene board 1 are close, the positions of the two ends in the wall thickness direction are marked on both ends of the threaded rod 4, referring to the actual wall thickness to be poured at the expansion joint. Then, second steel plates 51 are installed at both ends of the threaded rod 4. The distance between the two steel plates 51 and their opposite sides is equal to the overall thickness of the wall to be poured. When workers erect formwork on both sides of the extruded polystyrene board 1, the second steel plate 51 can be used to assist in positioning the formwork 6. After the formwork 6 is installed on the outside of the second steel plate 51 on the screw rod 4, a clamp 52 (preferably a mountain-shaped clamp 52) can be put on the part of the screw rod 4 located outside the formwork 6, and the clamp 52 can be pushed to lock onto the steel pipe 7 outside the formwork 6. Finally, a fastening nut 53 is screwed on the outside of the clamp 52 to complete the positioning and fixing installation of the formwork 6 and the extruded polystyrene board 1 at the building expansion joint. In this application, one part of the screw rod 4 is connected to the mold through the second steel plate 51, the clamp 52 and the fastening nut 53, and the other part is connected to the extruded board 1 through the mounting sleeve 2 and the first steel plate 3. In this way, they can form a stable integral structure during the pouring process, so as to ensure that the extruded board 1 is not easily displaced or deformed by large amount under the restriction of the screw rod 4 during the pouring process of the wall expansion joint. This effectively solves the safety and building quality problems that may be caused by the wall expansion joint during the pouring process.
[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.
Claims
1. A narrow-diameter expansion joint template with fixing device, comprising an installation sleeve (2) disposed on an extruded polystyrene board (1), characterized in that: The mounting sleeve (2) penetrates the extruded board (1) and has internal threads. A first steel plate (3) is fixedly mounted on each end of the mounting sleeve (2). The two first steel plates (3) approach each other and abut against the surface of the extruded board (1) on the corresponding side. The mounting sleeve (2) is fitted with a lead screw (4) and the two are threaded together. A reinforcing unit (5) is provided on each end of the lead screw (4). The lead screw (4) can position and reinforce the templates (6) on both sides of the thickness direction of the extruded board (1) through the reinforcing units (5) at both ends. The reinforcement unit (5) includes two second steel plates (51), both of which are fixedly installed on the screw rod (4). The two second steel plates (51) are respectively abutted against the inner sides of the templates (6) on both sides of the thickness direction of the extruded board (1). A clamp (52) is also respectively fitted on the screw rod (4) on the outer side of the templates (6) on both sides of the thickness direction of the extruded board (1). A fastening nut (53) is provided on the outer side of the clamp (52), and the fastening nut (53) is threadedly connected to the screw rod (4). The first steel plate (3) is fixed to the mounting sleeve (2) by welding, and the second steel plate (51) and the lead screw (4) are fixed by threaded connection.
2. The narrow-diameter expansion joint template with fixing device according to claim 1, characterized in that: The first steel plate (3) has a cross-section of 50mm×50mm square, and the second steel plate (51) has a cross-section of 30mm×30mm square.
3. The narrow-diameter expansion joint template with fixing device according to claim 2, characterized in that: The thickness of the first steel plate (3) and the second steel plate (51) is 3mm.
4. The narrow-diameter expansion joint template with fixing device according to any one of claims 1 to 3, characterized in that: The external thread diameter of the lead screw (4) and the internal thread diameter of the mounting sleeve (2) are both 12 mm.
5. The narrow-diameter expansion joint template with fixing device according to claim 1, characterized in that: The lead screw (4) is composed of two independent parts of equal length. The two independent parts of the lead screw (4) are a first rod (41) and a second rod (42). The threads on the first rod (41) and the second rod (42) are opposite in direction. The direction of one half of the internal thread in the mounting sleeve (2) is the same as the direction of the external thread on the first rod (41), and the direction of the other half of the internal thread in the mounting sleeve (2) is the same as the direction of the external thread on the second rod (42).