A method for strengthening prefabricated wall joints by connecting transverse reinforcement bars with steel pins

Abstract

The present invention discloses a prefabricated wall joint and a construction method for connecting transverse steel bars with steel pins. The joint comprises a prefabricated concave wall (1), a prefabricated convex wall (2), and a steel pin (3). The prefabricated concave wall comprises a reserved concrete groove, a water-stopping steel plate, a reserved steel hole, a prefabricated concave wall steel sleeve, and a prefabricated concave wall concrete pedestal. A transverse steel bar is provided on the front side of the prefabricated convex wall connected to the prefabricated concave wall, a prefabricated convex wall concrete concave pedestal matched with the prefabricated concave wall concrete pedestal is provided on the bottom side, and a prefabricated convex wall steel sleeve matched with the prefabricated concave wall steel sleeve is provided on the side. Two sections of wall width are installed using positioning components, and then the joint and the steel hole are grout-filled. The present invention is simple to construct. Not only does it significantly improve the bending and shearing resistance of the prefabricated wall joint by the transverse steel bar, it also solves the problem of no through-steel bars at the joint along the length direction, which is common in prefabricated walls, but it also greatly improves the anti-seepage performance of the joint by the water-stopping steel plate.

Description

Technical Field

[0001] This project involves strengthening the load-bearing and anti-seepage performance of prefabricated ground-connected wall joints in underground retaining structures. To be more precise, it is a technology and construction method that uses steel pins to connect transverse steel bars to strengthen prefabricated wall joints. Background Art

[0002] Prefabricated diaphragm walls are rapidly gaining popularity in the field of underground retaining wall joints. They are favored in the construction industry for their advantages, such as high-quality prefabricated components, high construction efficiency, and improved environmental protection and energy conservation. However, due to the lack of through-construction transverse reinforcement at the joints and the presence of an interface between new and old concrete, prefabricated diaphragm walls have significant disadvantages in load-bearing and water-resistance compared to traditional diaphragm walls. When the underground retaining structure is subjected to active earth pressure from the soil on the facing side, the prefabricated diaphragm wall joints often become the weak points of the entire underground retaining structure. Most prefabricated diaphragm wall accidents also occur at these joints, resulting in damage or leakage. In contrast, prefabricated underground wall joints designed by domestic and foreign scholars, such as self-clamping prefabricated underground diaphragm walls and "V"-shaped prefabricated underground diaphragm wall joints, lack through-construction transverse reinforcement at the joints between the two wall sections, resulting in poor load-bearing performance. The latter, however, involves direct contact between the new and old concrete joints and the soil, significantly reducing the water-resistance of the joints.

[0003] Therefore, it is very necessary to construct transverse reinforcement at the joints of prefabricated ground-connected walls to improve their bearing capacity and improve the anti-seepage performance of the joints. The construction measures should be convenient, safe and fast to improve the stiffness, overall stability and anti-seepage performance of the underground retaining structure. Summary of the Invention

[0004] Technical problem: The purpose of the present invention is to provide a technology and construction method for strengthening prefabricated wall joints by connecting transverse steel bars with steel pins, so as to solve the problem of low bearing capacity and poor anti-seepage performance of the joints of existing prefabricated ground-connected walls in the above background, and to provide reliable reinforcement for the bearing capacity and anti-seepage performance of the joints.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the present invention provides a prefabricated wall joint strengthened by connecting transverse steel bars with steel pins. The joint comprises a prefabricated concave wall and a prefabricated convex wall and a steel pin. The prefabricated concave wall comprises a reserved concrete groove, a water-stop steel plate, a reserved steel hole, a prefabricated concave wall steel sleeve, and a prefabricated concave wall concrete pedestal; a reserved concrete groove is provided on the front side of the prefabricated concave wall connected to the prefabricated convex wall, and water-stop steel plates are provided on both side surfaces. Half of the water-stop steel plate is connected to the prefabricated concave wall, and the other half is left empty and connected to the prefabricated convex wall. A prefabricated concave wall steel sleeve is provided in the middle of the edge of the water-stop steel plate, and a reserved steel hole is provided on the prefabricated concave wall; the prefabricated convex wall comprises transverse steel bars, a prefabricated convex wall steel sleeve, and a prefabricated concave wall concrete pedestal. The precast concave tube and the precast convex wall concrete concave platform are provided with a precast concave wall concrete pedestal on the lower side of the precast concave wall; the front side of the precast convex wall connected to the precast concave wall is provided with a transverse steel bar, the lower side is provided with a precast convex wall concrete concave platform matched with the precast concave wall concrete pedestal, and the side is provided with a precast convex wall steel sleeve matched with the precast concave wall steel sleeve; when the precast concave wall and the precast convex wall are connected, the transverse steel bar on the precast convex wall is inserted into the reserved concrete groove in the precast concave wall, the precast convex wall concrete concave platform under the precast convex wall is matched with the precast concave wall concrete pedestal under the precast concave wall, the steel pins are inserted into the precast concave wall steel sleeve and the precast convex wall steel sleeve, and the steel pins are also inserted into the reserved steel holes and pass through the transverse steel bar.

[0006] The top of the steel pin is provided with a nail cap, the diameter of the nail cap is 2-3 cm larger than the diameter of the reserved steel hole, and the diameter of the nail body is larger than 25 mm.

[0007] The diameter of the horizontal steel bars is greater than 30mm, the vertical spacing is less than 1.2m, the exposed length along the wall width is greater than the depth of the reserved concrete groove and is not less than 40cm, ensuring that after installation is completed, the gap at the joint of the two wall sections does not exceed 15mm.

[0008] The height of the reserved concrete groove is greater than the diameter of the transverse steel bar, the width of the reserved concrete groove should be greater than the width of the transverse steel bar, and appropriate gaps should be reserved to ensure that the transverse steel bar can smoothly enter the reserved concrete groove.

[0009] The waterstop steel plates are composed of two pieces, which are respectively embedded in the joints on both sides of the wall across the prefabricated concave wall. The two waterstop steel plates are welded together by two rows of transverse steel bars, and the transverse steel bars are welded together with the wall steel cage. The thickness of the waterstop steel plate is greater than 10 mm, and the contact width with the prefabricated concave wall and the prefabricated convex wall is greater than 40 cm.

[0010] The reserved steel holes do not extend continuously to the bottom of the wall, but are segmented steel holes with a truncation in the middle. The length of the truncation should be equal to the height of the reserved concrete groove, and there should be a truncation at the designed position along the depth direction of each group of transverse steel bars. Each section of the reserved steel holes is welded to the transverse steel bars by connecting steel bars; in the plane position, the reserved steel holes are located between two rows of transverse steel bars.

[0011] The prefabricated concave wall steel sleeve is welded to both ends of the water-stop steel plate, has a length less than 1 / 2 of the wall height, and a diameter greater than or equal to the diameter of the steel pin.

[0012] The prefabricated convex wall steel sleeve is located on the side of the prefabricated convex wall, is horizontally welded through the transverse steel bars of the prefabricated convex wall, and is then welded to the steel cage of the prefabricated convex wall. There are two groups of prefabricated convex wall steel sleeves, two in one group, which are respectively welded to the top and bottom of the wall on the side of the prefabricated convex wall, and the axes of each group coincide. The length of the prefabricated convex wall steel sleeve is slightly less than 1 / 4 of the height of the prefabricated convex wall.

[0013] The prefabricated concave wall concrete pedestal is a right prism extending upward from the bottom of the prefabricated concave wall, and the prefabricated convex wall concrete concave platform is a right prism depression at the bottom of the prefabricated convex wall. The two are completely complementary in size and their function is to assist in positioning so that the horizontal steel bars can smoothly enter the reserved concrete groove.

[0014] The construction method of the present invention for strengthening prefabricated wall joints by connecting transverse reinforcement bars with steel pins comprises:

[0015] Step S1: Production of the prefabricated concave wall: First, weld the prefabricated concave wall steel sleeve at the designed position of the waterstop steel plate, connect the waterstop steel plate through transverse steel bars, and weld reserved steel holes through connecting steel bars at the designed position between the two rows of transverse steel bars. The axes of each group of steel holes should coincide. Then, weld the above-mentioned whole to the steel cage of the prefabricated concave wall through transverse steel bars. Support the formwork and pay attention to leaving space at the reserved concrete groove and reserved steel holes. Pour concrete and maintain according to the design requirements to complete the production of the prefabricated concave wall.

[0016] Step S2: Fabricating the prefabricated convex wall: First, connect the prefabricated convex wall steel sleeve with the prefabricated convex wall transverse reinforcement, and then weld it to the prefabricated convex wall reinforcement cage. The transverse reinforcement is welded to the corresponding position of the reinforcement cage according to its designed position, quantity, and spacing. When supporting the formwork, the thickness of the end of the prefabricated convex wall near the joint is less than the designed thickness of the wall body. The thickness is: designed wall body thickness - thickness of waterstop steel plate × 2 - X, where X is to facilitate grouting in the gap between the waterstop steel plate and the prefabricated convex wall after installation. The thickness is generally 1-2 cm. After pouring and curing, the prefabricated convex wall is completed.

[0017] Step S3: Perform foundation preparation and measurement to ensure that the foundation is flat and its strength meets the requirements, and mark the positions of different wall widths; use lifting equipment to hoist the prefabricated concave wall to the designated location, use a spirit level to check and adjust, and ensure the verticality and horizontality of the wall; lower and install the prefabricated convex wall in the same way, and ensure that the prefabricated concave wall and the prefabricated convex wall are accurately aligned, and then push the prefabricated convex wall and the prefabricated concave wall to complete the docking, ensuring that the horizontal steel bars have redundant space to enter the reserved concrete groove, and the axis of the prefabricated concave wall steel sleeve on the prefabricated concave wall coincides with the axis of the prefabricated convex wall steel sleeve on the prefabricated convex wall;

[0018] Step S4: After the prefabricated concave wall and the prefabricated convex wall are butt-jointed and installed, steel pins are inserted into the reserved steel holes and steel sleeves to complete the mechanical installation inside and outside the wall;

[0019] Step S5: After completing step S4, grouting reinforcement is performed inside the reserved steel holes, prefabricated concave wall steel sleeves, prefabricated convex wall steel sleeves, and the gaps between the prefabricated concave walls and prefabricated convex walls. After the slurry initially sets, waterproof glue is applied to the top of the reserved steel holes and the prefabricated concave wall steel sleeves and prefabricated convex wall steel sleeves to prevent the steel pins from being corroded and improve the anti-seepage performance of the prefabricated wall.

[0020] Beneficial effects: Compared with the existing process, the technical advantages of the present invention are:

[0021] The present invention provides a technology and construction method for strengthening prefabricated wall joints by connecting transverse steel bars with steel pins, which is aimed at the large-scale application of green buildings and prefabricated buildings, but in the field of prefabricated ground-connected walls, the new joints lack a sufficiently safe and easy-to-install rigid connection, which greatly reduces the bearing capacity of the joints. The present invention constructs transverse steel bars and reserved concrete grooves at the wall joints, reserves steel circular holes on the top, constructs waterstop steel plates on both sides of the wall, and connects them by inserting steel pins through steel sleeves to form an internal and external rigid connection of the joints for reinforcement. Then, grouting is performed in the gap at the joints to fill the reserved concrete grooves and steel circular holes, so that the two wall sections form a whole. When subjected to soil pressure outside the foundation pit, the lateral action of the transverse steel bars and water-stop steel plates can greatly improve the bending and shear bearing capacity, and form a reliable reinforcement for the interface between the new and old concrete at the joints. In addition, the water-stop steel plates can improve the anti-seepage performance of the joints. The wall body is manufactured in the prefabricated component factory, and its bearing performance and anti-seepage performance are highly reliable, thereby forming a reliable reinforcement for the integrity and stability of the prefabricated wall as the foundation pit retaining structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the prefabricated concave wall after it is completed.

[0023] Figure 2 This is a schematic diagram of the structure of the prefabricated convex wall after it is completed.

[0024] Figure 3 This is a rendering of the effect after the prefabricated concave wall and convex wall of the present invention are installed.

[0025] Figure 4 It is a schematic structural diagram of the steel pin of the present invention.

[0026] Figure 5 This is a structural detail diagram of the prefabricated recessed wall joint of the present invention (with one side of the waterstop steel plate removed).

[0027] Figure 6 This is a schematic diagram of the structure of the prefabricated recessed wall joint of the present invention.

[0028] Figure 7 yes Figure 6 sectional view.

[0029] Figure 8 This is a schematic diagram of the prefabricated convex wall joint structure of the present invention.

[0030] Figure 9 It is a front view of the prefabricated recessed wall joint of the present invention.

[0031] Figure 10 It is a front view of the prefabricated convex wall joint of the present invention.

[0032] Figure 11 It is a top view of the prefabricated wall of the present invention after installation.

[0033] The figure includes: prefabricated concave wall 1, prefabricated convex wall 2, steel pins 3, reserved concrete groove 4, water-stop steel plate 5, reserved steel holes 6, prefabricated concave wall steel sleeve 7A, prefabricated convex wall steel sleeve 7B, prefabricated concave wall concrete base 8A, prefabricated convex wall concrete concave base 8B, horizontal steel bars 9, transverse steel bars 10, connecting steel bars 11, and prefabricated convex wall transverse steel bars 12. Specific implementation methods

[0034] The following is a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings in the embodiments of the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] See also Figure 1-11The present invention provides a prefabricated wall joint strengthened by connecting transverse steel bars with steel pins. The joint comprises a prefabricated concave wall and a prefabricated convex wall and a steel pin. The prefabricated concave wall comprises a reserved concrete groove, a water-stop steel plate, a reserved steel hole, a prefabricated concave wall steel sleeve, and a prefabricated concave wall concrete pedestal; a reserved concrete groove is provided on the front side of the prefabricated concave wall connected to the prefabricated convex wall, and water-stop steel plates are provided on both sides. Half of the water-stop steel plate is connected to the prefabricated concave wall, and the other half is left empty and connected to the prefabricated convex wall. A prefabricated concave wall steel sleeve is provided in the middle of the edge of the water-stop steel plate, and a reserved steel hole is provided on the prefabricated concave wall; the prefabricated convex wall comprises transverse steel bars, a prefabricated convex wall steel sleeve, a prefabricated convex wall A concrete concave platform is provided with a precast concave wall concrete pedestal on the lower side of the precast concave wall; a transverse steel bar is provided on the front side of the precast convex wall connected to the precast concave wall, a precast convex wall concrete concave platform matched with the precast concave wall concrete pedestal is provided on the lower side, and a precast convex wall steel sleeve matched with the precast concave wall steel sleeve is provided on the side; when the precast concave wall and the precast convex wall are connected, the transverse steel bar on the precast convex wall is inserted into the reserved concrete groove in the precast concave wall, the precast convex wall concrete concave platform under the precast convex wall is matched with the precast concave wall concrete pedestal under the precast concave wall, the steel pins are inserted into the precast concave wall steel sleeve and the precast convex wall steel sleeve, and the steel pins are also inserted into the reserved steel holes and pass through the transverse steel bar.

[0036] The steel pins are topped with caps 2-3cm larger in diameter than the pre-recorded steel holes, and the pin bodies are larger than 25mm in diameter. The horizontal steel bars are larger than 30mm in diameter, with vertical spacing less than 1.2m. The exposed length along the wall width is greater than the depth of the pre-recorded concrete trench and no less than 40cm. Ensure that after installation, the gap between the two wall sections does not exceed 15mm.

[0037] The height of the reserved concrete groove is greater than the diameter of the transverse steel bar, and the width of the reserved concrete groove should be greater than the width of the transverse steel bar, and appropriate gaps should be reserved to ensure that the transverse steel bar can smoothly enter the reserved concrete groove. There are two water-stop steel plates respectively embedded in the joint of the prefabricated concave wall on both sides of the wall. The two water-stop steel plates are welded together by two rows of transverse steel bars, and the transverse steel bars are welded to the wall steel cage; the thickness of the water-stop steel plate is greater than 10mm, and the contact width with the prefabricated concave wall and the prefabricated convex wall is greater than 40cm. The reserved steel holes do not extend continuously to the bottom of the wall, but are segmented steel holes with a truncation in the middle. The length of the truncation should be equal to the height of the reserved concrete groove, and there should be a truncation at the designed position along the depth direction of each group of transverse steel bars. Each section of the reserved steel hole is welded to the transverse steel bar through the connecting steel bar; in the plane position, the reserved steel hole is located between the two rows of transverse steel bars. The prefabricated concave wall steel sleeve is welded to both ends of the water-stop steel plate, and its length is less than 1 / 2 of the wall height, and its diameter is greater than or equal to the diameter of the steel pin. The prefabricated convex wall steel sleeve is located on the side of the prefabricated convex wall, and is horizontally welded through the transverse steel bars of the prefabricated convex wall, and then welded to the steel cage of the prefabricated convex wall. There are two groups of prefabricated convex wall steel sleeves, one group of two, which are respectively welded to the top and bottom of the wall on the side of the prefabricated convex wall, and the axes of each group coincide. The length of the prefabricated convex wall steel sleeve is slightly less than 1 / 4 of the height of the prefabricated convex wall. After the grouting is completed, the transverse steel bars are fixed, and the reserved concrete grooves and reserved steel holes are filled, which can effectively solve the problem of lack of rigid connection at the joint of the prefabricated wall, and greatly improve the bearing capacity and anti-seepage performance of the joint.

[0038] The specific implementation steps of the present invention are described below:

[0039] Step S1: Production of the prefabricated concave wall: First, weld the prefabricated concave wall steel sleeve at the designed position of the waterstop steel plate, connect the waterstop steel plate through transverse steel bars, and weld reserved steel holes through connecting steel bars at the designed position between the two rows of transverse steel bars. The axes of each group of steel holes should coincide. Then, weld the above-mentioned whole to the steel cage of the prefabricated concave wall through transverse steel bars. Support the formwork and pay attention to leaving space at the reserved concrete groove and reserved steel holes. Pour concrete and maintain according to the design requirements to complete the production of the prefabricated concave wall.

[0040] Step S2: Fabricating the prefabricated convex wall: First, connect the prefabricated convex wall steel sleeve with the prefabricated convex wall transverse reinforcement, and then weld it to the prefabricated convex wall reinforcement cage. The transverse reinforcement is welded to the corresponding position of the reinforcement cage according to its designed position, quantity, and spacing. When supporting the formwork, the thickness of the end of the prefabricated convex wall near the joint is less than the designed thickness of the wall body. The thickness is: designed wall body thickness - thickness of waterstop steel plate × 2 - X, where X is to facilitate grouting in the gap between the waterstop steel plate and the prefabricated convex wall after installation. The thickness is generally 1-2 cm. After pouring and curing, the prefabricated convex wall is completed.

[0041] Step S3: Perform foundation preparation and measurement to ensure that the foundation is flat and its strength meets the requirements, and mark the positions of different wall widths; use lifting equipment to hoist the prefabricated concave wall to the designated location, use a spirit level to check and adjust, and ensure the verticality and horizontality of the wall; lower and install the prefabricated convex wall in the same way, and ensure that the prefabricated concave wall and the prefabricated convex wall are accurately aligned, and then push the prefabricated convex wall and the prefabricated concave wall to complete the docking, ensuring that the horizontal steel bars have redundant space to enter the reserved concrete groove, and the axis of the prefabricated concave wall steel sleeve on the prefabricated concave wall coincides with the axis of the prefabricated convex wall steel sleeve on the prefabricated convex wall;

[0042] Step S4: After the prefabricated concave wall and the prefabricated convex wall are butt-jointed and installed, steel pins are inserted into the reserved steel holes and steel sleeves to complete the mechanical installation inside and outside the wall;

[0043] Step S5: After completing step S4, grouting reinforcement is performed inside the reserved steel holes, prefabricated concave wall steel sleeves, prefabricated convex wall steel sleeves, and the gaps between the prefabricated concave walls and prefabricated convex walls. After the slurry initially sets, waterproof glue is applied to the top of the reserved steel holes and the prefabricated concave wall steel sleeves and prefabricated convex wall steel sleeves to prevent the steel pins from being corroded and improve the anti-seepage performance of the prefabricated wall.

[0044] The working principle of the present invention is described below:

[0045] The calculation formula for the shear bearing capacity of precast wall joints in existing domestic and international standards can be divided into two parts: one is the interface shear force between the new and old concrete, and the other is the shear bearing capacity provided by the steel bars running through the joint. For example, Article 6.2.5 of the European Union standard PrEN-1992-1-1 stipulates that the shear bearing capacity of the concrete interface poured at different times is calculated as follows:

[0046] V u ≤cf ctd A c +μN+A s f y (μsinα+cosα)

[0047] It is not difficult to see that the shear bearing capacity calculated by this formula is divided into three parts, among which cf ctd A c The shear resistance provided for the connection between new and old concrete, A s f y (μsinα+cosα) is the shear capacity provided by the steel bars running through the joint, and μN is the shear capacity provided by the pressure at both ends of the wall. The greater the pressure, the greater the shear capacity provided by this part. In JGJ1-2014 "Design Code for Prefabricated Concrete Structures", under seismic design conditions, the design value of the shear capacity of the horizontal joints of precast shear walls is calculated as follows:

[0048] V μE =0.6f y A sd +0.8N

[0049] Among them, f y is the tensile design value of ordinary steel bars, A sd is the area of ​​shear reinforcement passing through the joint surface perpendicularly, N is the design value of axial force perpendicular to the joint surface corresponding to the shear force design value V, which is positive for pressure and negative for tension.

[0050] This formula ignores the shear bearing capacity provided by the connection between the new and old concrete, and retains the other two parts, which indirectly confirms that the steel bars that pass through the joints in prefabricated wall joints have an extremely high contribution rate to the steel bars in the joints. However, due to the limitations of wall installation and construction, it is difficult to design transverse steel bars that pass through the joints in the design of the joints. Most joint forms use mechanical connections of steel joints, but this type of connection often has multiple degrees of freedom, which greatly reduces the shear bearing capacity of the joints. In the present invention, since the transverse steel bars 9 pass through the joints, the water-stop steel plates 5 connecting the wall steel cages are connected by steel sleeves 7. The above two are fixed by steel pins 3 to restrain the deformation of the joints, improve the bearing capacity and anti-seepage performance of the joints, and use the concrete base 8 for convenient positioning and installation, which solves the problem of difficult prefabricated wall construction in traditional processes, while improving the integrity of the wall body, and improving the safety and reliability of the foundation pit retaining structure.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A prefabricated wall joint reinforced with transverse reinforcement using steel pins, characterized in that: The joint comprises a prefabricated concave wall (1), a prefabricated convex wall (2) and a steel pin (3); the prefabricated concave wall (1) comprises a reserved concrete groove (4), a water-stop steel plate (5), a reserved steel hole (6), a prefabricated concave wall steel sleeve (7A), and a prefabricated concave wall concrete bearing platform (8A); a reserved concrete groove (4) is provided on the front side of the prefabricated concave wall (1) connected to the prefabricated convex wall (2), and water-stop steel plates (5) are provided on both sides, half of the water-stop steel plate (5) is connected to the prefabricated concave wall (1), and the other half is left empty and connected to the prefabricated convex wall (2); a prefabricated concave wall steel sleeve (7A) is provided in the middle of the edge of the water-stop steel plate (5), and a reserved steel hole (6) is provided on the prefabricated concave wall (1); the prefabricated convex wall (2) comprises a transverse steel bar (9), a prefabricated convex wall steel sleeve (7B), a prefabricated convex wall concrete concave platform (8B), and a prefabricated concave wall (1) is provided at the bottom. A prefabricated concave wall concrete pedestal (8A) is provided on the side; a transverse steel bar (9) is provided on the front side of the prefabricated convex wall (2) connected to the prefabricated concave wall (1); a prefabricated convex wall concrete concave platform (8B) matched with the prefabricated concave wall concrete pedestal (8A) is provided on the lower side; a prefabricated convex wall steel sleeve (7B) matched with the prefabricated concave wall steel sleeve (7A) is provided on the side; when the prefabricated concave wall (1) and the prefabricated convex wall (2) are connected, the transverse steel bar (9) on the prefabricated convex wall (2) is inserted into the reserved concrete groove (4) in the prefabricated concave wall (1); the prefabricated convex wall concrete concave platform (8B) under the prefabricated convex wall (2) is matched with the prefabricated concave wall concrete pedestal (8A) under the prefabricated concave wall (1); the steel pin (3) is inserted into the prefabricated concave wall steel sleeve (7A) and the prefabricated convex wall steel sleeve (7B); the steel pin (3) is also inserted into the reserved steel hole (6) and passes through the transverse steel bar (9).

2. The method of strengthening a prefabricated wall joint by connecting transverse reinforcement bars with steel pins according to claim 1, characterized in that: The top of the steel pin (3) is provided with a nail cap, and the diameter of the nail cap is 2-3 cm larger than the diameter of the reserved steel hole (6), and the diameter of the nail body is larger than 25 mm.

3. The method of strengthening a prefabricated wall joint by connecting transverse reinforcement bars with steel pins according to claim 1, characterized in that: The diameter of the transverse steel bars (9) is greater than 30 mm, the vertical spacing is less than 1.2 m, and the exposed length along the wall width direction is greater than the depth of the reserved concrete groove (4) and is not less than 40 cm, ensuring that after installation, the gap at the joint of the two wall sections does not exceed 15 mm.

4. The method of strengthening a prefabricated wall joint by connecting transverse reinforcement bars with steel pins according to claim 1, characterized in that: The height of the reserved concrete groove (4) is greater than the diameter of the transverse steel bar (9), the width of the reserved concrete groove (4) should be greater than the width of the transverse steel bar (9), and appropriate gaps should be reserved to ensure that the transverse steel bar (9) can smoothly enter the reserved concrete groove (4).

5. The method of strengthening a prefabricated wall joint by connecting transverse reinforcement bars with steel pins according to claim 1, characterized in that: The waterstop steel plates (5) have two pieces respectively embedded in the joints of the prefabricated concave wall (1) on both sides of the wall. The two waterstop steel plates (5) are welded together by two rows of transverse steel bars (10), and the transverse steel bars (10) are welded together with the wall reinforcement cage. The thickness of the waterstop steel plates (5) is greater than 10 mm, and the contact width with the prefabricated concave wall (1) and the prefabricated convex wall (2) is greater than 40 cm.

6. The method of strengthening a prefabricated wall joint by connecting transverse reinforcement bars with steel pins according to claim 1, characterized in that: The reserved steel holes (6) are not continuously extended to the bottom of the wall, but are segmented steel holes with a cutoff in the middle. The cutoff length should be equal to the height of the reserved concrete groove (4), and there should be a cutoff at the designed position along the depth direction of each group of transverse steel bars (9). Each section of the reserved steel hole (6) is welded to the transverse steel bar (10) through the connecting steel bar (11); in the plane position, the reserved steel hole (6) is located between two rows of transverse steel bars (10).

7. The method of strengthening a prefabricated wall joint by connecting transverse reinforcement bars with steel pins according to claim 1, characterized in that: The prefabricated concave wall steel sleeve (7A) is welded to both ends of the water-stop steel plate (5), its length is less than 1 / 2 of the wall height, and its diameter is greater than or equal to the diameter of the steel pin (3).

8. The method of strengthening a prefabricated wall joint by connecting transverse reinforcement bars with steel pins according to claim 1, wherein: The prefabricated convex wall steel sleeve (7B) is located on the side of the prefabricated convex wall (2), is horizontally welded via the prefabricated convex wall transverse reinforcement (12), and is then welded to the reinforcement cage of the prefabricated convex wall (2). The prefabricated convex wall steel sleeve (7B) comprises two groups, one group of two, which are respectively welded to the top and bottom of the side of the prefabricated convex wall (2), and the axes of each group coincide. The length of the prefabricated convex wall steel sleeve (7B) is slightly less than 1 / 4 of the height of the prefabricated convex wall (2).

9. The method of strengthening a prefabricated wall joint by connecting transverse reinforcement bars with steel pins according to claim 1, characterized in that: The prefabricated concave wall concrete pedestal (8A) is a right prism protruding upward from the bottom of the prefabricated concave wall (1), and the prefabricated convex wall concrete concave platform (8B) is a right prism concave at the bottom of the prefabricated convex wall (2). The two are completely complementary in size and serve to assist in positioning so that the transverse steel bars (9) can smoothly enter the reserved concrete groove (4).

10. A construction method for strengthening prefabricated wall joints by connecting transverse reinforcements with steel pins as claimed in claim 1, characterized in that: The construction method includes: Step S1: Production of prefabricated concave wall, first weld the prefabricated concave wall steel sleeve (7A) at the designed position of the water stop steel plate (5), connect the water stop steel plate (5) through the transverse steel bar (10), and weld the reserved steel holes (6) through the connecting steel bar (11) at the designed position between the two rows of transverse steel bars (10), the axis of each group of steel holes should coincide, and then weld the above-mentioned whole to the steel cage of the prefabricated concave wall (1) through the transverse steel bar (10), support the formwork and pay attention to leaving space at the reserved concrete groove (4) and the reserved steel hole (6), pour concrete and maintain according to the design requirements, and complete the production of the prefabricated concave wall (1); Step S2: Production of the prefabricated convex wall. First, the prefabricated convex wall steel sleeve (7B) is connected through the prefabricated convex wall transverse reinforcement (12), and then welded to the reinforcement cage of the prefabricated convex wall (2). The transverse reinforcement (9) is welded to the corresponding position of the reinforcement cage according to its designed position, quantity and spacing. When supporting the formwork, the thickness of the end of the prefabricated convex wall (2) close to the joint is less than the designed thickness of the wall body. Its thickness is: the designed thickness of the wall body - the thickness of the water-stop steel plate (5) × 2-X, where X is for grouting in the gap at the joint of the water-stop steel plate (5) and the prefabricated convex wall (2) after installation is completed. Generally, 1-2 cm is taken. After pouring and curing, the production of the prefabricated convex wall (2) is completed. Step S3: perform foundation treatment and measurement to ensure that the foundation is flat and its strength meets the requirements, and mark the positions of different wall widths; use lifting equipment to hoist the prefabricated concave wall (1) to the designated position, use a level to check and adjust, ensure the verticality and horizontality of the wall, lower and install the prefabricated convex wall (2) in the same way, ensure that the prefabricated concave wall (1) and the prefabricated convex wall (2) are accurately aligned, push the prefabricated convex wall (2) and the prefabricated concave wall (1) to complete the docking, ensure that the horizontal steel bars have redundant space to enter the reserved concrete groove, and the axis of the prefabricated concave wall steel sleeve (7A) on the prefabricated concave wall coincides with the axis of the prefabricated convex wall steel sleeve (7B) on the prefabricated convex wall; Step S4: After the prefabricated concave wall (1) and the prefabricated convex wall (2) are butt-jointed and installed, the steel pins (3) are inserted into the reserved steel holes (6) and the steel sleeves (7) to complete the mechanical installation inside and outside the wall; Step S5: After completing step S4, grouting reinforcement is performed inside the reserved steel holes (6), the prefabricated concave wall steel sleeves (7A), the prefabricated convex wall steel sleeves (7B), and the gaps between the prefabricated concave wall (1) and the prefabricated convex wall (2). After the slurry is initially set, waterproof glue is applied to the tops of the reserved steel holes (6), the prefabricated concave wall steel sleeves (7A), and the prefabricated convex wall steel sleeves (7B) to prevent the steel pins (3) from being corroded and improve the anti-seepage performance of the prefabricated wall.

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