Prefabricated T-shaped connector of concrete pool and connecting structure of prefabricated T-shaped connector and prefabricated side plate

Abstract

The utility model discloses a prefabricated T-shaped joint of a concrete pool and a connecting structure of the prefabricated T-shaped joint and a prefabricated side plate, the prefabricated T-shaped joint comprises a prefabricated T-shaped joint body, the prefabricated T-shaped joint body comprises a first concrete side plate and a second concrete side plate, and the first concrete side plate and the second concrete side plate are arranged along a first direction; the first concrete side plate extends in the second direction, and the second concrete side plate extends in the third direction. The first concrete side plate is provided with a first end and a second end which are oppositely arranged in the second direction. The first end of the first concrete side plate is integrally formed on the second concrete side plate; the second concrete side plate is provided with a third end and a fourth end which are oppositely arranged in the third direction. The end face of the second end, the end face of the third end and the end face of the fourth end are each concaved inwards to form a secondary pouring groove, and the two ends of each secondary pouring groove extend in the first direction and penetrate through the first top face and the first bottom face of the prefabricated T-shaped connector body correspondingly. The assembly type concrete pool can be separated.

Description

Technical Field

[0001] The utility model relates to a concrete pool, in particular to a prefabricated T-shaped joint of the concrete pool and a connection structure thereof with a prefabricated side plate. Background Art

[0002] Concrete pools are used in various fields, such as fire protection systems, industrial systems, agricultural systems and other fields of life. Prefabricated concrete fire water pools are assembled from prefabricated concrete panels, steel components, sealing strips and other structural components, all of which are formed by industrialized production and on-site assembly construction. They can achieve construction goals such as safety and durability, fast construction speed, and reduced environmental pollution, minimizing construction sewage and garbage pollution, while also reducing construction noise and improving construction quality.

[0003] According to the national standard "Technical Specifications for Fire Water Supply and Fire Hydrant Systems (GB 50974-2014)" 4.3.6, the total effective water storage volume of the fire water tank is greater than 500m 3 When using a concrete water tank, it is advisable to set up two fire water tanks that can be used independently. Therefore, in order to separate the two water tanks, it is necessary to design a T-joint module suitable for concrete water tanks. Summary of the invention

[0004] 1. Technical problems to be solved by the utility model

[0005] The purpose of the utility model is to overcome the above-mentioned shortcomings and provide a prefabricated T-joint of a concrete pool and a connection structure with a prefabricated side plate. The technical solution of the utility model has a simple structure and is easy to manufacture, and can separate the assembled concrete pool. In addition, the secondary casting groove increases the contact area of ​​the secondary casting, thereby increasing the stability of the connection.

[0006] 2. Technical solution

[0007] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0008] The utility model discloses a prefabricated T-joint of a concrete pool, comprising a prefabricated T-joint body, wherein the prefabricated T-joint body comprises a first concrete side plate and a second concrete side plate, wherein the first concrete side plate and the second concrete side plate are both arranged along a first direction; the first concrete side plate extends along a second direction, and the second concrete side plate extends along a third direction; wherein the first direction and the second direction are perpendicular to each other, and the second direction and the third direction are perpendicular to each other;

[0009] The first concrete side plate has a first end and a second end arranged opposite to each other along a second direction; the first end of the first concrete side plate is integrally formed with the second concrete side plate; the second concrete side plate has a third end and a fourth end arranged opposite to each other along a third direction; the end faces of the second end, the third end and the fourth end are all concave to form a secondary casting groove, and the two ends of the secondary casting groove extend along the first direction and respectively pass through the first top surface and the first bottom surface of the prefabricated T-joint body.

[0010] Furthermore, the prefabricated T-joint body has a first top surface and a first bottom surface arranged opposite to each other along a first direction, the first concrete side plate has a first steel bar skeleton built in, and both ends of the first steel bar skeleton extend along the first direction and extend from the first top surface and the first bottom surface respectively; and / or, the second concrete side plate has a second steel bar skeleton built in, and both ends of the second steel bar skeleton extend along the first direction and extend from the first top surface and the first bottom surface respectively.

[0011] Furthermore, the secondary casting groove has a first groove wall and a second groove wall arranged opposite to each other, and the first groove wall of the secondary casting groove is provided with a plurality of first through holes arranged at intervals along the first direction; the second groove wall of the secondary casting groove is provided with a plurality of second through holes arranged at intervals along the first direction; the first through holes and the second through holes are arranged in a one-to-one correspondence.

[0012] Furthermore, the end faces of the second end, the third end and the fourth end are all concave to form a group of bolt assembly notches arranged at intervals along the first direction; the bolt assembly notch group is composed of a first notch and a second notch respectively located on both sides of the secondary casting groove, and the first notch and the second notch are arranged correspondingly.

[0013] Furthermore, it also includes a first L-shaped metal plate and a second L-shaped metal plate, the first concrete side plate has a first side surface and a second side surface arranged opposite to each other along a third direction, the second concrete side plate has a third side surface and a fourth side surface located on both sides of the first concrete side plate; the third side surface connects the first side surface and the end surface of the third end; the fourth side surface connects the second side surface and the end surface of the fourth end; the two first metal plates constituting the first L-shaped metal plate are respectively connected to the third side surface and the first side surface; the two second metal plates constituting the second L-shaped metal plate are respectively connected to the fourth side surface and the second side surface.

[0014] Furthermore, the two first metal plates constituting the first L-shaped metal plate are respectively embedded in the third side surface of the second concrete and the first side surface of the first concrete side plate; the two second metal plates constituting the second L-shaped metal plate are respectively embedded in the fourth side surface of the second concrete and the second side surface of the first concrete side plate.

[0015] Furthermore, the first L-shaped metal plate has a second top surface and a second bottom surface arranged opposite to each other along the first direction, and the second L-shaped metal plate has a third top surface and a third bottom surface arranged opposite to each other along the first direction, and the distance H1 between the first top surface and the second top surface is 10cm-15cm; the distance h1 between the first bottom surface and the second bottom surface is 10cm-15cm; the distance H2 between the first top surface and the third top surface is 10cm-15cm; and the distance h2 between the first bottom surface and the third bottom surface is 10cm-15cm.

[0016] Furthermore, a distance L1 between the first side surface and an end surface of the third end is equal to a distance L2 between the second side surface and an end surface of the fourth end.

[0017] Furthermore, a hook is provided on the first top surface or / the first bottom surface of the prefabricated T-joint body.

[0018] The utility model discloses a connection structure of a prefabricated T-joint and a prefabricated side plate of a concrete water pool, comprising a prefabricated side plate and the prefabricated T-joint, wherein the second end, the third end and the fourth end of the prefabricated T-joint body are provided with prefabricated side plates, and the second end of the prefabricated T-joint body and the prefabricated side plate, the third end of the prefabricated T-joint body and the prefabricated side plate body, and the fourth end of the prefabricated T-joint body and the prefabricated side plate are connected by concrete poured into a secondary pouring groove.

[0019] 3. Beneficial effects

[0020] Compared with the existing known technologies, the technical solution provided by the utility model has the following beneficial effects:

[0021] (1) A prefabricated T-shaped joint of a concrete pool of the utility model is designed such that the first end of the first concrete side plate is integrally formed with the second concrete side plate, which facilitates the manufacture of the prefabricated T-shaped joint;

[0022] (2) The utility model is a prefabricated T-joint for a concrete pool, wherein the second end, the third end and the fourth end are connected to the prefabricated side panels, so that the assembled concrete pool can be divided. In addition, the end faces of the second end, the third end and the fourth end are all designed to be concave to form a secondary casting groove, and the two ends of the secondary casting groove extend along the first direction and respectively penetrate the first top surface and the first bottom surface of the prefabricated T-joint body, which can increase the contact area of ​​the secondary casting and thereby increase the stability of the connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1This is a structural schematic diagram of a prefabricated T-joint of a concrete pool of the utility model;

[0024] Figure 2 It is a cross-sectional view of a prefabricated T-joint of a concrete pool of the utility model;

[0025] Figure 3 It is a schematic diagram of a connection structure of a prefabricated T-joint and a prefabricated side plate of a concrete pool of the utility model;

[0026] Figure 4 The utility model is a schematic diagram of a connection structure of a prefabricated T-joint and a prefabricated side plate of a concrete pool applied to a concrete pool.

[0027] Explanation of the numbers in the schematic diagram: 1. Prefabricated T-joint body; 11. First concrete side plate; 12. Second concrete side plate; 13. Secondary casting groove; 14. First notch; 15. Second notch; 16. Hook; 17. First L-shaped metal plate; 18. Second L-shaped metal plate; 2. Prefabricated side plate. DETAILED DESCRIPTION

[0028] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0029] Example

[0030] Combination Figure 1 A prefabricated T-joint of a concrete pool in this embodiment includes a prefabricated T-joint body 1, which is a cast-in-place whole plate or a prefabricated plate; the prefabricated T-joint body 1 includes a first concrete side plate 11 and a second concrete side plate 12, both of which are arranged along a first direction; the first concrete side plate 11 extends along a second direction, and the second concrete side plate 12 extends along a third direction; wherein the first direction and the second direction are perpendicular to each other, and the second direction and the third direction are perpendicular to each other; the first concrete side plate 11 has a first end and a second end arranged opposite to each other along the second direction; the first end of the first concrete side plate 11 is integrally formed with the second concrete side plate 12;

[0031] The second concrete side plate 12 has a third end and a fourth end arranged relatively along the third direction; the end faces of the second end, the third end and the fourth end are all concave to form a secondary casting groove 13, and the two ends of the secondary casting groove 13 extend along the first direction and respectively pass through the first top surface and the first bottom surface of the prefabricated T-joint body 1.

[0032] In this embodiment, the prefabricated T-joint body 1 is composed of an integrally formed first concrete side panel 11 and a second concrete side panel 12, which is easy to manufacture. Since the first concrete side panel 11 and the second concrete side panel 12 are both arranged along the first direction; the first concrete side panel 11 extends along the second direction, and the second concrete side panel 12 extends along the third direction; therefore, the second end, the third end and the fourth end of the prefabricated T-joint body 1 can be respectively connected to the prefabricated side panels in three directions, thereby enabling the assembled concrete pool to be separated; in addition, the end face of the second end, the end face of the third end and the end face of the fourth end are all designed to be concave to form a secondary casting groove, which can increase the contact area of ​​the secondary casting, thereby increasing the stability of the connection.

[0033] It should be noted that the cross-sectional shape of this secondary casting groove can be U-shaped or wedge-shaped, and the specific structural shape is not limited as long as the contact area of ​​the secondary casting can be increased; in addition, the height of the prefabricated T-joint body 1 along the first direction is 3000mm or 3200mm or 3400mm or 3600mm or 3800mm or 2800mm or 2600mm or 2500mm.

[0034] In some embodiments, in order to enhance the structural strength of the prefabricated T-joint, the prefabricated T-joint body 1 has a first top surface and a first bottom surface arranged opposite to each other along a first direction, the first concrete side plate 11 has a first steel bar skeleton built in, and both ends of the first steel bar skeleton extend along the first direction and extend from the first top surface and the first bottom surface respectively; and / or, the second concrete side plate 12 has a second steel bar skeleton built in, and both ends of the second steel bar skeleton extend along the first direction and extend from the first top surface and the first bottom surface respectively.

[0035] In this embodiment, by setting a first steel bar skeleton in the first concrete side plate 11 and / or by setting a second steel bar skeleton in the second concrete side plate 12, the prefabricated T-joint 1 can be prevented from cracking and the bearing strength and service life of the prefabricated T-joint 1 can be improved.

[0036] It should be noted that the first steel frame and the second steel frame can both be composed of a plurality of stirrups and a plurality of steel bars arranged along the first direction. Of course, they can also be composed of a plurality of steel bars arranged along the first direction. In addition, the first steel frame and the second steel frame constitute a steel frame, and the steel frame consists of a plurality of stirrups and a plurality of steel bars arranged along the first direction.

[0037] In some embodiments, in order to strengthen the connection, the secondary casting groove 13 has a first groove wall and a second groove wall arranged opposite to each other, and the first groove wall of the secondary casting groove 13 is provided with a plurality of first through holes arranged at intervals along the first direction; the second groove wall of the secondary casting groove 13 is provided with a plurality of second through holes arranged at intervals along the first direction; the first through holes and the second through holes are arranged in a one-to-one correspondence.

[0038] In this embodiment, in order to pre-connect the prefabricated T-joint and the prefabricated side panel, a plywood is required to be provided at the joint of the prefabricated T-joint and the prefabricated side panel. The plywood and the pre-connected prefabricated T-joint are pre-connected by connecting bolts passing through the first through hole, the second through hole and the two plywood and then connected with nuts. The plywood and the prefabricated side panel are pre-connected, and then the prefabricated T-joint and the prefabricated side panel are finally connected by pouring concrete in the secondary casting groove 13. The connecting bolts here not only connect the prefabricated T-joint and the prefabricated side panel, but also strengthen the structural strength of the concrete solidified in the secondary casting groove 13.

[0039] Of course, in order to strengthen the connection, in some embodiments, the end face of the second end, the end face of the third end, and the end face of the fourth end are all concave to form a bolt assembly notch group arranged at intervals along the first direction; the bolt assembly notch group is composed of a first notch 14 and a second notch 15 respectively located on both sides of the secondary casting groove 13, and the first notch 14 and the second notch 15 are arranged correspondingly.

[0040] In this embodiment, see Figure 3 As shown, in order to pre-connect the prefabricated T-joint and the prefabricated side panel, a clamping plate is required to be provided at the joint of the prefabricated T-joint and the prefabricated side panel. Since the prefabricated T-joint is provided with a bolt assembly notch group, in order to enable the prefabricated T-joint and the prefabricated side panel to be connected, a bolt assembly notch group is also provided on the end surface of the prefabricated side panel corresponding to the bolt assembly notch group. The bolt assembly notch group of the adjacent pre-connected prefabricated T-joint and the bolt assembly notch group of the prefabricated side panel form a mounting hole for the bolts to pass through; then the adjacent pre-connected prefabricated T-joint is connected. The head, prefabricated side panel and clamping panel can be pre-fixed by bolts, that is, the bolt can be extended from one end of the mounting hole into and through the secondary casting groove 13, and then extended from the other end of the mounting hole to be connected with the nut. Next, concrete is poured in the secondary casting groove 13. After the concrete solidifies, the final assembly of the adjacent pre-connected prefabricated T-joints and prefabricated side panels can be completed. Among them, since the bolt part is pre-buried in the concrete solidified in the secondary casting groove 13, the connection between the two adjacent prefabricated side panels is more stable.

[0041] In some embodiments, see Figure 2In order to prevent water seepage in the prefabricated T-joint, the prefabricated T-joint body also includes a first L-shaped metal plate 17 and a second L-shaped metal plate 18. The first concrete side plate 11 has a first side surface and a second side surface that are relatively arranged along a third direction. The second concrete side plate 12 has a third side surface and a fourth side surface located on both sides of the first concrete side plate 11; the third side surface connects the first side surface and the end surface of the third end; the fourth side surface connects the second side surface and the end surface of the fourth end; the two first metal plates constituting the first L-shaped metal plate 17 are respectively connected to the third side surface and the first side surface; the two second metal plates constituting the second L-shaped metal plate 18 are respectively connected to the fourth side surface and the second side surface.

[0042] In this embodiment, the first L-shaped metal plate 17 and the second L-shaped metal plate 18 are used to cover the area of ​​the prefabricated T-joint body 1 that directly faces water, and the first L-shaped metal plate 17 and the second L-shaped metal plate 18 are used to prevent water from seeping out of the prefabricated T-joint, and the first L-shaped metal plate 17 and the second L-shaped metal plate 18 play a role in preventing water seepage; and in order to prevent the first L-shaped metal plate 17 and the second L-shaped metal plate 18 from corroding and affecting the water quality, the first L-shaped metal plate 17 and the second L-shaped metal plate 18 are designed to be made of corrosion-resistant metal plates, or the first L-shaped metal plate 17 and the second L-shaped metal plate 18 are designed to be made of metal plates with corrosion-resistant layers.

[0043] It should be noted that a first metal plate constituting the first L-shaped metal plate 17 and the first side surface of the first concrete side plate 11, another first metal plate constituting the first L-shaped metal plate 17 and the third side surface of the second concrete side plate 12, a second metal plate constituting the second L-shaped metal plate 18 and the second side surface of the first concrete side plate 11, and another second metal plate constituting the second L-shaped metal plate 18 and the fourth side surface of the second concrete side plate 12 are all integrally connected by casting.

[0044] Furthermore, the two first metal plates constituting the first L-shaped metal plate 17 are respectively embedded in the third side surface of the second concrete and the first side surface of the first concrete side plate 11; the two second metal plates constituting the second L-shaped metal plate 18 are respectively embedded in the fourth side surface of the second concrete and the second side surface of the first concrete side plate 11.

[0045] It should be noted that in order to ensure a firm connection between the first L-shaped metal plate 17, the second L-shaped metal plate 18, the first concrete side plate and the second concrete side plate, the first L-shaped metal plate 17 and the second L-shaped metal plate 18 can be integrally formed with folded edges, which are inserted into prefabricated T-joints and can then be fixedly connected to the steel frame.

[0046] In some embodiments, the first L-shaped metal plate 17 has a second top surface and a second bottom surface arranged opposite to each other along the first direction, and the second L-shaped metal plate 18 has a third top surface and a third bottom surface arranged opposite to each other along the first direction, and the distance H1 between the first top surface and the second top surface is 10cm-15cm; the distance h1 between the first bottom surface and the second bottom surface is 10cm-15cm; the distance H2 between the first top surface and the third top surface is 10cm-15cm; the distance h2 between the first bottom surface and the third bottom surface is 10cm-15cm.

[0047] In this embodiment, by designing H1=10cm-15cm, h1=10cm-15cm, H2=10cm-15cm and h2=10cm-15cm, the use of metal plates can be minimized while maximizing the water storage capacity in the concrete pool.

[0048] It should be noted that the values ​​of H1, h1, H2 and h2 can be any one of 11 cm, 12 cm, 13 cm and 14 cm, and H1 is equal to H2, and h2 is equal to h1.

[0049] In some embodiments, the distance L1 between the first side surface and the end surface of the third end is equal to the distance L2 between the second side surface and the end surface of the fourth end, which is convenient for mass production; of course, the distance between the first side surface and the end surface of the third end may not be equal to the distance between the second side surface and the end surface of the fourth end.

[0050] It should be noted that the distance L1 between the first side surface and the end surface of the third end is equal to the distance L2 between the second side surface and the end surface of the fourth end, which may be equal to 300 mm, 200 mm, 250 mm, 350 mm or 400 mm.

[0051] In some embodiments, a hook 16 is disposed on the first top surface or / the first bottom surface of the prefabricated T-joint body 1, and the hook 16 is used to facilitate lifting of the prefabricated T-joint, thereby facilitating assembly of the concrete pool.

[0052] See also Figure 3 and Figure 4 , a connection structure of a prefabricated T-joint and a prefabricated side plate of a concrete water pool in this embodiment includes a prefabricated side plate 2 and a prefabricated T-joint, and prefabricated side plates 2 are arranged at the second end, the third end and the fourth end of the prefabricated T-joint body 1, and the second end of the prefabricated T-joint body 1 and the prefabricated side plate 2, the third end of the prefabricated T-joint body 1 and the prefabricated side plate 2, and the fourth end of the prefabricated T-joint body 1 and the prefabricated side plate 2 are all connected by pouring concrete in the secondary casting groove 13.

[0053] In this embodiment, in order to make the connection more stable, a secondary casting groove 13 is also provided on the end surface of the prefabricated side panel 2 corresponding to the secondary casting groove 13. Here, when the adjacent prefabricated side panels 2 and the prefabricated T-joint are spliced, the secondary casting groove 13 on the end surface of the prefabricated side panel 2 and the secondary casting groove 13 on the end surface of the prefabricated T-joint body 1 form a concrete casting channel, and then the adjacent prefabricated side panels 2 and the prefabricated T-joint are connected by pouring concrete into the concrete casting channel.

[0054] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A prefabricated T-joint for a concrete pool, characterized in that: The prefabricated T-joint body includes a first concrete side plate and a second concrete side plate, wherein the first concrete side plate and the second concrete side plate are both arranged along a first direction; the first concrete side plate extends along a second direction, and the second concrete side plate extends along a third direction; wherein the first direction and the second direction are perpendicular to each other, and the second direction and the third direction are perpendicular to each other; The first concrete side plate has a first end and a second end arranged opposite to each other along a second direction; the first end of the first concrete side plate is integrally formed with the second concrete side plate; the second concrete side plate has a third end and a fourth end arranged opposite to each other along a third direction; the end faces of the second end, the third end and the fourth end are all concave to form a secondary casting groove, and the two ends of the secondary casting groove extend along the first direction and respectively pass through the first top surface and the first bottom surface of the prefabricated T-joint body.

2. The prefabricated T-joint for a concrete pool according to claim 1, characterized in that: The prefabricated T-joint body has a first top surface and a first bottom surface arranged opposite to each other along a first direction, the first concrete side plate has a first steel bar skeleton built in, both ends of the first steel bar skeleton extend along the first direction and extend from the first top surface and the first bottom surface respectively; and / or, the second concrete side plate has a second steel bar skeleton built in, both ends of the second steel bar skeleton extend along the first direction and extend from the first top surface and the first bottom surface respectively.

3. The prefabricated T-joint for a concrete pool according to claim 1, characterized in that: The secondary casting groove has a first groove wall and a second groove wall arranged opposite to each other, and the first groove wall of the secondary casting groove is provided with a plurality of first through holes arranged at intervals along the first direction; the second groove wall of the secondary casting groove is provided with a plurality of second through holes arranged at intervals along the first direction; the first through holes and the second through holes are arranged in a one-to-one correspondence.

4. The prefabricated T-joint for a concrete pool according to claim 1, characterized in that: The end faces of the second end, the third end and the fourth end are all concave to form a group of bolt assembly notches arranged at intervals along the first direction; the bolt assembly notch group is composed of a first notch and a second notch respectively located on both sides of the secondary casting groove, and the first notch and the second notch are arranged correspondingly.

5. A prefabricated T-joint for a concrete pool according to any one of claims 1 to 4, characterized in that: It also includes a first L-shaped metal plate and a second L-shaped metal plate, the first concrete side plate having a first side surface and a second side surface arranged opposite to each other along a third direction, the second concrete side plate having a third side surface and a fourth side surface located on both sides of the first concrete side plate; the third side surface connects the first side surface and the end surface of the third end; the fourth side surface connects the second side surface and the end surface of the fourth end; the two first metal plates constituting the first L-shaped metal plate are respectively connected to the third side surface and the first side surface; the two second metal plates constituting the second L-shaped metal plate are respectively connected to the fourth side surface and the second side surface.

6. The prefabricated T-joint for a concrete pool according to claim 5, characterized in that: The two first metal plates constituting the first L-shaped metal plate are respectively embedded in the third side surface of the second concrete and the first side surface of the first concrete side plate; the two second metal plates constituting the second L-shaped metal plate are respectively embedded in the fourth side surface of the second concrete and the second side surface of the first concrete side plate.

7. The prefabricated T-joint for a concrete pool according to claim 5, characterized in that: The first L-shaped metal plate has a second top surface and a second bottom surface arranged opposite to each other along a first direction, and the second L-shaped metal plate has a third top surface and a third bottom surface arranged opposite to each other along the first direction, and the distance H1 between the first top surface and the second top surface is 10cm-15cm; the distance h1 between the first bottom surface and the second bottom surface is 10cm-15cm; the distance H2 between the first top surface and the third top surface is 10cm-15cm; the distance h2 between the first bottom surface and the third bottom surface is 10cm-15cm.

8. The prefabricated T-joint for a concrete pool according to claim 5, characterized in that: A distance L1 between the first side surface and an end surface of the third end is equal to a distance L2 between the second side surface and an end surface of the fourth end.

9. The prefabricated T-joint for a concrete pool according to claim 2, characterized in that: The first top surface or / the first bottom surface of the prefabricated T-joint body is provided with a hook.

10. A connection structure of a prefabricated T-joint and a prefabricated side plate of a concrete pool, characterized in that: It comprises a prefabricated side plate and the prefabricated T-joint as described in any one of claims 1 to 9, wherein the second end, the third end and the fourth end of the prefabricated T-joint body are provided with prefabricated side plates, and the second end of the prefabricated T-joint body and the prefabricated side plate, the third end of the prefabricated T-joint body and the prefabricated side plate, and the fourth end of the prefabricated T-joint body and the prefabricated side plate are connected by pouring concrete in the secondary casting groove.

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