A bolt connection joint structure for steel strand concrete precast wall panels

Abstract

This utility model discloses a bolted connection joint structure for precast concrete wall panels using steel strands. The aim is to provide a convenient installation and connection method for precast concrete wall panels, effectively solving the problem that the forces on the joint structures of existing precast concrete diaphragm walls are concentrated at the ends of the precast concrete wall panels, leading to cracking at the ends. The structure includes: an anchoring assembly comprising two anchors fixed to both ends of the precast concrete wall panel, with steel strands embedded within the precast concrete wall panel. The ends of the steel strands are anchored within the two anchors of the corresponding anchoring assembly, and the anchors have connecting screw holes; and a variable-diameter screw corresponding to each anchor, comprising a first screw section and a second screw section coaxially distributed, the outer diameter of the first screw section being larger than that of the second screw section, and the first screw section being connected to the connecting screw hole of the corresponding anchor.

Description

Technical Field

[0001] This utility model relates to the field of prefabricated concrete underground continuous wall technology, specifically to a bolt connection joint structure for steel strand concrete precast wall panels. Background Technology

[0002] Prefabricated concrete diaphragm walls are manufactured in factories using standardized processes, and feature fast construction speed, controllable quality, good seepage prevention performance, strong adaptability, and flexible construction. As a result, they are widely used in diaphragm walls.

[0003] In deep foundation pit engineering, each panel of a prefabricated concrete diaphragm wall is composed of multiple precast concrete panels arranged sequentially from top to bottom. Adjacent precast concrete panels need to be connected via a joint structure. Currently, this joint structure typically uses pre-embedded anchors and connecting boxes. The anchors are embedded at both ends of the precast concrete panels, and the anchors are connected to the connecting boxes using lock nuts. This current joint structure for precast concrete panels has the following drawbacks: the forces acting on the joint structure between the panels are concentrated at the ends, making the ends prone to cracking, affecting the quality of the diaphragm wall, and even causing water seepage problems.

[0004] For example, Chinese Patent Publication No. CN 111705783 A, entitled "A Precast Diaphragm Wall and its Segmented Joint Structure and Construction Method," includes a precast diaphragm wall constructed first and a precast diaphragm wall constructed subsequently. Bolts on the precast diaphragm wall pass through corresponding bolt holes on the subsequent diaphragm wall and extend into corresponding hand holes, where they are secured with nuts. It also suffers from the aforementioned shortcomings. Utility Model Content

[0005] The purpose of this utility model is to provide a bolt connection joint structure for precast concrete wall panels that facilitates the installation and connection of precast concrete wall panels and effectively solves the problem that the force on the joint structure of existing precast concrete underground continuous walls is concentrated at the ends of the precast concrete wall panels, which leads to cracking at the ends of the wall panels and affects the quality of the underground continuous wall.

[0006] The technical solution of this utility model is:

[0007] A bolted connection joint structure for precast concrete wall panels using steel strands includes:

[0008] An anchoring assembly includes two anchors that are fixed to both ends of a precast concrete wall panel. The precast concrete wall panel contains steel strands. The anchoring assembly corresponds to the steel strands. Both ends of the steel strands are anchored in the two anchors of the corresponding anchoring assembly. The anchors are provided with connecting screw holes.

[0009] The variable diameter screw, which corresponds to the anchor, includes a first screw section and a second screw section coaxially distributed. The outer diameter of the first screw section is larger than that of the second screw section. The first screw section is connected in the connecting screw hole of the corresponding anchor, and the second screw section is located outside the anchor.

[0010] In this proposed solution, a bolted connection joint structure for precast concrete wall panels using steel strands utilizes a reducing bolt as the connecting bolt to connect two adjacent precast concrete wall panels, facilitating installation and connection between the panels. Simultaneously, since the reducing bolt and anchor are integrated via threaded connection, and the two ends of the steel strand embedded within the precast concrete wall panel are anchored in the corresponding anchoring components, the forces acting on the reducing bolt and anchors are directly transmitted to various parts of the precast concrete wall panel via the steel strand. This effectively disperses the forces acting on the joint structure between the precast concrete wall panels, effectively solving the problem of concentrated forces on the ends of existing precast concrete diaphragm walls, which easily leads to cracking at the wall panel ends and affects the quality of the diaphragm wall.

[0011] On the other hand, the anchor in the bolted connection joint structure of the steel strand concrete precast wall panel of this solution can be used as an anchor for the steel strand in the concrete precast wall panel to anchor the steel strand; it can also be used in conjunction with the reducing screw as a connection structure for two adjacent sections of concrete precast wall panel, so that the reducing screw and the steel strand share a single anchor, thereby simplifying the structure and reducing costs.

[0012] Furthermore, because the steel strands need to extend into the anchoring sleeve of the anchorage for anchoring, the inner diameter of the anchoring sleeve is relatively large. The connecting screw holes are also located inside the anchoring sleeve, resulting in a relatively large diameter. The connecting box, which connects the two precast concrete wall panels to the reducing screw, has a compact structure and limited space. If the screw diameter is large, the outer diameter of the locking nut that mates with the screw will also be relatively large, making tightening the locking nut inconvenient. Simultaneously, the precast concrete wall panels contain a large number of steel strands with small spacing, resulting in a large number of anchorages and reducing screws with similar spacing, further complicating the tightening of the locking nuts. To solve this problem, this solution uses a variable diameter screw. The first screw section with a larger outer diameter is used to fit the connecting screw hole of the anchor, while the second screw section with a smaller outer diameter is used to fit the connecting box that connects the two precast concrete wall panels. This reduces the outer diameter of the locking nut that fits with the second screw section, making it easier to tighten the locking nut and facilitating the installation and connection of the precast concrete wall panels.

[0013] Preferably, the reducing screw also includes an operating section that engages with a wrench, positioned between the first and second screw sections. This allows the first screw section of the reducing screw to be tightened into the connecting threaded hole using a wrench and the operating section, facilitating practical operation.

[0014] Preferably, the cross-section of the operating segment is polygonal.

[0015] Preferably, the outer diameter of the first screw section is 1.5-3 times that of the second screw section. The outer diameter of the first screw section needs to match the connecting screw hole. If the outer diameter of the second screw section is too small, it may affect the connection stability between the precast concrete wall panels. Therefore, this solution sets the outer diameter of the first screw section to 1.5-3 times that of the second screw section. This reduces the outer diameter of the locking nut that matches the second screw section, thus facilitating the tightening operation of the locking nut; it also ensures the strength of the second screw section to guarantee the connection stability between the precast concrete wall panels.

[0016] Preferably, the anchorage includes:

[0017] An anchoring sleeve is fixed to the end of a precast concrete wall panel. The anchoring sleeve has a tapered hole inside, and the connecting bolt holes are located inside the anchoring sleeve and are coaxially distributed with the tapered hole.

[0018] Several wedge-shaped blocks are distributed inside the conical hole;

[0019] The two ends of the steel strand pass through the anchor sleeves of the corresponding anchors and are anchored inside the anchor sleeves by wedge blocks. In this way, the steel strand can be reliably anchored inside the anchor sleeves by the wedge clips engaging with the tapered holes, without affecting the connection between the first screw section and the connecting screw hole.

[0020] Preferably, the device also includes positioning end plates, which are fixed to both ends of the precast concrete wall panel. The anchor includes an anchor sleeve, which is fixed to the positioning end plates. This ensures that the anchor is stably and reliably fixed to the ends of the precast concrete wall panel.

[0021] Preferably, the end face of the first screw section is provided with a receiving hole, into which the end of the steel strand extends. Because the end of the steel strand needs to extend beyond the anchorage during prestressing, after the steel strand is anchored, this exposed portion needs to be cut off, and a pressure bar needs to be used to flatten it to make room for the connecting threaded hole of the anchoring sleeve before the first screw section can be installed. This is not only inconvenient but also increases construction steps and reduces construction efficiency. To solve this problem, this solution provides a receiving hole. After the steel strand is anchored, only the exposed portion needs to be cut off to install the first screw section, while the steel strand extending into the connecting threaded hole can be accommodated within the receiving hole. This eliminates the need to use a pressure bar to flatten the steel strand to make room for the internal threaded hole of the anchoring sleeve, thus simplifying the construction process and improving construction efficiency.

[0022] Preferably, the first screw section is a solid first screw section.

[0023] Prestressed steel strand is preferred.

[0024] Preferably, one end of the anchor sleeve is flush with the outer surface of the positioning end plate, and the other end of the anchor sleeve is embedded in the precast concrete wall panel. In this way, when two adjacent precast concrete wall panels are connected by a connecting box, interference between the anchor sleeve and the connecting box can be avoided, allowing the connecting box to rest tightly against the surface of the positioning end plate.

[0025] The beneficial effects of this utility model are as follows: By using a variable-diameter screw as a connecting bolt to connect two adjacent precast concrete wall panels, the installation and connection between the precast concrete wall panels is facilitated. Simultaneously, since the variable-diameter screw and the anchor are integrated through a threaded connection, and the two ends of the steel strand pre-embedded in the steel strand concrete precast wall panel are anchored in the two anchors of the corresponding anchoring components, the force on the variable-diameter screw and anchors will be directly transmitted to various parts of the precast concrete wall panel through the steel strand. This effectively disperses the force on the joint structure between the precast concrete wall panels, effectively solving the problem that the force on the joint structure of existing precast concrete diaphragm walls is concentrated at the ends of the precast concrete wall panels, leading to cracking at the ends and affecting the quality of the diaphragm wall.

[0026] Furthermore, by using a variable-diameter screw, the first screw section with a larger outer diameter is used to fit the connecting screw hole of the anchor, while the second screw section with a smaller outer diameter is used to fit the connecting box connecting the two precast concrete wall panels. This reduces the outer diameter of the locking nut that fits with the second screw section, making it easier to tighten the locking nut and facilitating the installation and connection of the precast concrete wall panels. Attached Figure Description

[0027] Figure 1 This is a partial structural diagram of a bolt connection joint structure for a precast concrete wall panel with steel strands according to this utility model.

[0028] Figure 2 This is a schematic diagram of a variable diameter screw according to this utility model.

[0029] Figure 3 This is a partial structural diagram of a bolted connection joint structure for a precast concrete wall panel with steel strands, according to the present invention, in practical application.

[0030] In the picture:

[0031] Anchor 1, anchor sleeve 1.1, connecting bolt hole 1.2, tapered hole 1.3, wedge block 1.4;

[0032] Positioning end plate 2;

[0033] 3. Precast concrete wall panels;

[0034] 4 strands of steel wire;

[0035] The variable diameter screw 5 consists of a first screw section 5.1, a second screw section 5.2, and an operating section 5.3.

[0036] Connect the housing 6 and the end plate 6.1;

[0037] Lock nut 7. Detailed Implementation

[0038] Specific Implementation Example 1, such as Figure 1 , Figure 2 As shown, a bolted connection joint structure for a precast concrete wall panel with steel strand includes an anchoring component and a variable diameter bolt 5.

[0039] The anchoring assembly includes two anchors 1, each fixed to one end of the precast concrete wall panel 3; that is, the anchoring assembly includes two anchors 1, which are fixed to one end of the precast concrete wall panel 3. A steel strand 4 is provided inside the precast concrete wall panel 3. In this embodiment, the steel strand 4 is a prestressed steel strand. The anchoring assembly corresponds one-to-one with the steel strand 4. Both ends of the steel strand 4 are anchored within the two anchors 1 of the corresponding anchoring assembly. The anchors 1 are provided with connecting screw holes 1.2.

[0040] The reducing screw 5 corresponds one-to-one with the anchor 1. The reducing screw 5 includes a first screw section 5.1 and a second screw section 5.2 coaxially distributed. The outer diameter of the first screw section 5.1 is larger than that of the second screw section 5.2. The first screw section 5.1 is connected to the connecting screw hole 1.2 of the corresponding anchor 1. The second screw section 5.2 is located outside the anchor 1 and outside the precast concrete wall panel 3.

[0041] In this embodiment, a bolted connection joint structure for precast concrete wall panels using steel strands is employed. A variable-diameter bolt 5 serves as the connecting bolt to connect two adjacent precast concrete wall panels 3, facilitating installation and connection between the panels. Simultaneously, since the variable-diameter bolt 5 and the anchor 1 are integrated via threaded connection, and the two ends of the steel strand 4, pre-embedded within the precast concrete wall panel 3, are anchored in the corresponding anchor 1, the forces acting on the variable-diameter bolt 5 and the anchor 1 are directly transmitted to various parts of the precast concrete wall panel 3 via the steel strand 4. This effectively disperses the forces acting on the joint structure between the precast concrete wall panels 3, effectively solving the problem that in existing precast concrete diaphragm walls, the forces acting on the joint structure are concentrated at the ends of the precast concrete wall panels 3, leading to cracking at the ends and affecting the quality of the diaphragm wall.

[0042] On the other hand, in the bolt connection joint structure of the steel strand concrete precast wall panel of this embodiment, the anchor 1 can be used as the anchor 1 of the steel strand 4 in the concrete precast wall panel 3 to anchor the steel strand 4; it can also be used in conjunction with the variable diameter screw 5 as the connection structure of two adjacent sections of concrete precast wall panel 3, so that the variable diameter screw 5 and the steel strand 4 share a single anchor 1, thereby simplifying the structure and reducing costs.

[0043] Furthermore, since the steel strand 4 needs to be anchored into the anchoring sleeve 1.1 of the anchor 1, the inner diameter of the anchoring sleeve 1.1 is relatively large. The connecting screw hole 1.2 is located inside the anchoring sleeve 1.1, and therefore its diameter is also relatively large. Meanwhile, the connecting box 6, which connects the two precast concrete wall panels 3 with the reducing screw 5, has a compact structure and limited space. If the screw diameter is large, the outer diameter of the locking nut that mates with the screw will also be relatively large, making tightening the locking nut inconvenient. To solve this problem, this embodiment uses a reducing screw 5. The first screw section 5.1 with a larger outer diameter mates with the connecting screw hole 1.2 of the anchor 1, while the second screw section 5.2 with a smaller outer diameter mates with the connecting box 6 connecting the two precast concrete wall panels 3. This reduces the outer diameter of the locking nut that mates with the second screw section 5.2, thus facilitating the tightening of the locking nut and improving the installation and connection of the precast concrete wall panels 3.

[0044] Specific embodiment two, such as Figure 1 , Figure 2 As shown, a bolted connection joint structure for a precast concrete wall panel with steel strand includes an anchoring component and a variable diameter bolt 5.

[0045] The anchoring assembly includes two anchors 1, each fixed to one end of the precast concrete wall panel 3; that is, the anchoring assembly includes two anchors 1, which are fixed to the upper and lower ends of the precast concrete wall panel 3 respectively. The precast concrete wall panel 3 contains steel strands 4, which in this embodiment are prestressed steel strands. The anchors 1 are provided with connecting screw holes 1.2.

[0046] Anchor 1 includes an anchoring sleeve 1.1 and several wedge-shaped blocks 1.4. The anchoring sleeve 1.1 is fixed to the end of the precast concrete wall panel 3. The anchoring sleeve 1.1 has a conical hole 1.3 inside. The wedge-shaped blocks 1.4 are distributed circumferentially within the conical hole 1.3. Connecting screw holes 1.2 are provided inside the anchoring sleeve 1.1 and are coaxially distributed with the conical hole 1.3. One end of the connecting screw hole 1.2 is connected to the end with the largest inner diameter in the conical hole 1.3. The openings of the connecting screw holes 1.2 of the anchoring sleeve 1.1 fixed to the lower end of the precast concrete wall panel 3 are distributed downwards, while the openings of the connecting screw holes 1.2 of the anchoring sleeve 1.1 fixed to the upper end of the precast concrete wall panel 3 are distributed upwards.

[0047] Each anchoring component corresponds one-to-one with the steel strand 4. Both ends of the steel strand 4 are anchored within the two anchors 1 of the corresponding anchoring components. Specifically, the upper and lower ends of the steel strand 4 pass through the anchoring sleeves 1.1 of the corresponding anchors 1 and are anchored within the anchoring sleeves 1.1 via wedge blocks 1.4. Thus, the steel strand 4 can be reliably anchored within the anchoring sleeves 1.1 by engaging with the conical holes 1.3; simultaneously, this does not affect the subsequent connection between the first screw section 5.1 and the connecting screw hole 1.2.

[0048] The reducing screw 5 corresponds one-to-one with the anchor 1. The reducing screw 5 includes a first screw section 5.1 and a second screw section 5.2 coaxially distributed. The outer diameter of the first screw section 5.1 is larger than that of the second screw section 5.2. The first screw section 5.1 is connected to the connecting screw hole 1.2 of the corresponding anchor 1. The second screw section 5.2 is located outside the anchor 1 and outside the precast concrete wall panel 3.

[0049] In this embodiment, a bolted connection joint structure for precast concrete wall panels using steel strands is employed. A variable-diameter bolt 5 serves as the connecting bolt to connect two adjacent precast concrete wall panels 3, facilitating installation and connection between the panels. Simultaneously, since the variable-diameter bolt 5 and the anchor 1 are integrated via threaded connection, and the two ends of the steel strand 4, pre-embedded within the precast concrete wall panel 3, are anchored in the corresponding anchor 1, the forces acting on the variable-diameter bolt 5 and the anchor 1 are directly transmitted to various parts of the precast concrete wall panel 3 via the steel strand 4. This effectively disperses the forces acting on the joint structure between the precast concrete wall panels 3, effectively solving the problem that in existing precast concrete diaphragm walls, the forces acting on the joint structure are concentrated at the ends of the precast concrete wall panels 3, leading to cracking at the ends and affecting the quality of the diaphragm wall.

[0050] On the other hand, in the bolt connection joint structure of the steel strand concrete precast wall panel of this embodiment, the anchor 1 can be used as the anchor 1 of the steel strand 4 in the concrete precast wall panel 3 to anchor the steel strand 4; it can also be used in conjunction with the variable diameter screw 5 as the connection structure of two adjacent sections of concrete precast wall panel 3, so that the variable diameter screw 5 and the steel strand 4 share a single anchor 1, thereby simplifying the structure and reducing costs.

[0051] Furthermore, since the steel strand 4 needs to be anchored into the anchor sleeve 1.1 of the anchor 1, the inner diameter of the anchor sleeve 1.1 is relatively large. The connecting screw hole 1.2 is also located inside the anchor sleeve 1.1, and therefore its diameter is also relatively large. Meanwhile, the connecting box 6, which connects the two sections of precast concrete wall panels 3 with the reducing screw 5, has a compact structure and limited space. If the diameter of the screw is large, the outer diameter of the locking nut that mates with the screw will also be relatively large, making it inconvenient to tighten the locking nut. At the same time, the number of steel strands 4 within the precast concrete wall panel 3 is large, and their spacing is small. Consequently, the number of anchors 1 and reducing screws 5 is also large, with small spacing, further complicating the tightening of the locking nut. To address this issue, this embodiment employs a variable-diameter screw 5. The first screw section 5.1, with a larger outer diameter, engages with the connecting screw hole 1.2 of the anchor 1, while the second screw section 5.2, with a smaller outer diameter, engages with the connecting box 6 that connects the two precast concrete wall panels 3. This reduces the outer diameter of the locking nut that engages with the second screw section 5.2, facilitating the tightening of the locking nut and making the installation and connection of the precast concrete wall panels 3 easier.

[0052] Specifically, such as Figure 1As shown, a bolted connection joint structure for a precast concrete wall panel with steel strand also includes a positioning end plate 2. The positioning end plate 2 is a steel plate. The positioning end plate 2 is fixed at both ends of the precast concrete wall panel 3. The positioning end plate 2 and the precast concrete wall panel 3 are cast as one piece. The anchoring sleeve 1.1 is fixed on the positioning end plate 2. In this way, the anchor 1 can be stably and reliably fixed at the end of the precast concrete wall panel 3.

[0053] In this embodiment, as Figure 1 As shown, one end of the anchor sleeve 1.1 is flush with the outer surface of the positioning end plate 2, and the other end of the anchor sleeve 1.1 is embedded in the precast concrete wall panel 3. Thus, when two adjacent precast concrete wall panels 3 are connected by the connecting box 6, interference between the anchor sleeve 1.1 and the connecting box 6 can be avoided, allowing the connecting box 6 to rest tightly against the surface of the positioning end plate 2. Specifically, the positioning end plate 2 has mounting holes corresponding to the anchors 1, and the anchor sleeves 1.1 of the anchors 1 are fixed in the corresponding mounting holes. The anchor sleeves 1.1 and the positioning end plate 2 are connected by welding, or by threaded connection; or the anchor sleeves 1.1 and the positioning end plate 2 are integrally formed.

[0054] It should be noted that one end of the anchor sleeve 1.1 may not be flush with the outer surface of the positioning end plate 2, and the relative position of the anchor sleeve 1.1 and the positioning end plate 2 can be set as needed.

[0055] Furthermore, such as Figure 1 , Figure 2 As shown, the reducing screw 5 also includes an operating section 5.3 that engages with a wrench. The operating section 5.3 is located between the first screw section 5.1 and the second screw section 5.2. The first screw section 5.1, the second screw section 5.2, and the operating section 5.3 are integrally formed. Thus, by using a wrench in conjunction with the operating section 5.3, the first screw section 5.1 of the reducing screw 5 can be tightened into the connecting screw hole 1.2, facilitating practical operation.

[0056] In this embodiment, the cross-section of the operation segment 5.3 is polygonal. For example, the cross-section of the operation segment 5.3 is a regular quadrilateral, a regular pentagon, or a regular hexagon, etc.

[0057] Furthermore, such as Figure 1 , Figure 2As shown, the outer diameter of the first screw section 5.1 is 1.5-3 times the outer diameter of the second screw section 5.2. For example, the outer diameter of the first screw section 5.1 is 1.5 times, 2 times, or 2.5 times the outer diameter of the second screw section 5.2. The outer diameter of the first screw section 5.1 needs to match the connecting screw hole 1.2. If the outer diameter of the second screw section 5.2 is too small, it may affect the connection stability between the precast concrete wall panels 3. Therefore, in this embodiment, the outer diameter of the first screw section 5.1 is set to 1.5-3 times the outer diameter of the second screw section 5.2. This reduces the outer diameter of the locking nut that matches the second screw section 5.2, thus facilitating the tightening operation of the locking nut; it also ensures the strength of the second screw section 5.2 to guarantee the connection stability between the precast concrete wall panels 3.

[0058] Furthermore, the specific structure of the variable diameter screw 5 can be adopted as follows:

[0059] In one embodiment, the first screw section 5.1 is a solid structure; specifically, the entire reducing screw 5 is a solid structure. This facilitates the actual processing and manufacturing of the reducing screw 5. Because the end of the steel strand 4 needs to extend beyond the anchor sleeve 1.1 during the prestressing process, and then the steel strand 4 is slowly tensioned, after the steel strand 4 is anchored in the anchor 1, the end of the steel strand 4 will protrude outside the anchor sleeve 1.1. Therefore, in this embodiment, this portion of the steel strand 4 protruding outside the anchor sleeve 1.1 needs to be cut off, and then a pressure bar is used to compress the steel strand 4 to flatten it, thus making room for the connecting screw hole 1.2 of the anchor sleeve 1.1; then the reducing screw 5 is installed.

[0060] In one implementation, such as Figure 1 As shown, the end face of the first screw section 5.1 is provided with a receiving hole, and the end of the steel strand 4 extends into the receiving hole. Since the end of the steel strand 4 needs to extend beyond the anchorage 1 during the application of prestress, after the steel strand 4 is anchored to the anchorage 1, this portion of the steel strand 4 protruding from the anchorage 1 needs to be cut off, and a pressure bar needs to be used to compress the steel strand 4 to flatten it, so as to make room for the connecting screw hole 1.2 of the anchorage sleeve 1.1; only then can the first screw section 5.1 be installed. This is not only inconvenient to operate, but also increases the construction steps and reduces construction efficiency. To solve this problem, this embodiment provides a receiving hole. After the steel strand 4 is anchored to the anchorage 1, only this portion of the steel strand 4 protruding from the anchorage 1 needs to be cut off to install the first screw section 5.1, and the steel strand 4 extending into the connecting screw hole 1.2 can be accommodated in the receiving hole. In this way, the operation step of using a pressure bar to compress the steel strand 4 to flatten it and make room for the internal threaded hole of the anchor sleeve 1.1 can be eliminated, thereby simplifying the construction steps and improving construction efficiency.

[0061] The following is one application of a steel strand concrete precast wall panel bolt connection joint structure in prefabricated diaphragm walls according to this embodiment.

[0062] like Figure 3 As shown, the prefabricated diaphragm wall comprises several precast concrete wall panels 3 arranged sequentially from top to bottom. A connecting box 6 is provided between any two adjacent precast concrete wall panels 3. The connecting box 6 has several connecting holes. A second threaded section 5.2 at the end of each precast concrete wall panel 3 passes through the connecting hole. A locking nut 7 is provided on the second threaded section 5.2, and the locking nut 7 is locked onto the connecting box 6, thereby connecting all the precast concrete wall panels 3 into one unit.

[0063] Specifically, the connecting box 6 includes two connecting end plates 6.1, one above the other, and several connecting partitions connecting the two connecting end plates 6.1. Each connecting end plate 6.1 has several connecting holes. In this embodiment, the connecting holes on the same connecting end plate 6.1 correspond one-to-one with the anchors 1 on the same end of the precast concrete wall panel 3. A locking nut is placed between the two connecting end plates 6.1. The locking nut is locked onto one of the connecting end plates 6.1.

[0064] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A bolted connection joint structure for precast concrete wall panels using steel strands, characterized in that, include: An anchoring assembly includes two anchors that are fixed to both ends of a precast concrete wall panel. The precast concrete wall panel contains steel strands. The anchoring assembly corresponds to the steel strands. Both ends of the steel strands are anchored in the two anchors of the corresponding anchoring assembly. The anchors are provided with connecting screw holes. The variable diameter screw, which corresponds to the anchor, includes a first screw section and a second screw section coaxially distributed. The outer diameter of the first screw section is larger than that of the second screw section. The first screw section is connected in the connecting screw hole of the corresponding anchor, and the second screw section is located outside the anchor.

2. A steel strand concrete precast wall panel bolted connection joint structure according to claim 1, characterized in that, The variable diameter screw also includes an operating section that cooperates with a wrench, and the operating section is located between the first screw section and the second screw section.

3. A steel strand concrete precast wall panel bolted connection joint structure according to claim 2, characterized in that, The cross-section of the operating segment is polygonal.

4. A steel strand concrete precast wall panel bolted connection joint structure according to claim 1 or 2 or 3, characterized in that, The outer diameter of the first screw section is 1.5 to 3 times the outer diameter of the second screw section.

5. A steel strand concrete precast wall panel bolted connection joint structure according to claim 1 or 2 or 3, characterized in that, The anchorage includes: An anchoring sleeve is fixed to the end of a precast concrete wall panel. The anchoring sleeve has a tapered hole inside, and the connecting bolt holes are located inside the anchoring sleeve and are coaxially distributed with the tapered hole. Several wedge-shaped blocks are distributed inside the conical hole; The two ends of the steel strand pass through the anchor sleeves of the corresponding anchors and are anchored inside the anchor sleeves by wedge blocks.

6. A bolted connection joint structure for precast concrete wall panels with steel strands according to claim 1, 2, or 3, characterized in that, It also includes positioning end plates, with the positioning end plates fixed at both ends of the precast concrete wall panel, and the anchor includes an anchor sleeve, which is fixed to the positioning end plates.

7. A steel strand concrete precast wall panel bolted connection joint structure according to claim 6, characterized in that, One end of the anchoring sleeve is flush with the outer surface of the positioning end plate, and the other end of the anchoring sleeve is embedded in the precast concrete wall panel.

8. A steel strand concrete precast wall panel bolted connection joint structure according to claim 1 or 2 or 3, characterized in that, The end face of the first screw section is provided with a receiving hole, and the end of the steel strand extends into the receiving hole.

9. A steel strand concrete precast wall panel bolted connection joint structure according to claim 1 or 2 or 3, characterized in that, The first screw section is a solid first screw section.

10. A steel strand concrete precast wall panel bolted connection joint structure according to claim 1 or 2 or 3, characterized in that, The steel strand is a prestressed steel strand.

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