Joint for reinforcing prefabricated wall by connecting transverse steel bars through steel pins and construction method

Abstract

The invention discloses a connector for reinforcing a prefabricated wall by connecting transverse steel bars through steel pins and a construction method. The connector comprises a prefabricated concave wall (1), a prefabricated convex wall (2) and the steel pins (3). 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 bearing platform; transverse steel bars are arranged on the front face of the side, connected with the prefabricated concave wall, of the prefabricated convex wall, a prefabricated convex wall concrete concave platform matched with the prefabricated concave wall concrete bearing platform is arranged on the lower side, and a prefabricated convex wall steel sleeve matched with the prefabricated concave wall steel sleeve is arranged on the side face. The two sections of wall panels are installed through the positioning parts, and then the joints and the interiors of the steel holes are subjected to grouting and filling. Construction is simple, the bending resistance and shear resistance of the prefabricated wall connector are remarkably improved through the transverse steel bars, the problem that no through steel bars exist in the connector part in the length direction of a prefabricated wall is solved, and the anti-seepage performance of the connector is greatly improved through the water stop steel plates.

Description

Technical Field

[0001] This project involves the strengthening of the 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 ground-connected walls have developed rapidly in the field of underground retaining joints. Prefabricated ground-connected walls have been favored by the construction field for their advantages such as good quality of prefabricated components, high construction efficiency, and more environmental protection and energy saving. However, due to the lack of through transverse steel bars and the existence of the interface between new and old concrete at the joints, the bearing capacity and impermeability of prefabricated ground-connected walls are relatively inferior to those of traditional ground-connected walls. When the underground retaining structure is subjected to the active earth pressure of the soil on the soil side, the joints of prefabricated ground-connected walls often become the weak points of the entire underground retaining structure. Most accidents involving prefabricated ground-connected walls also occur at the joints, where they are damaged or leaked. On the other hand, the prefabricated underground wall joints designed by domestic and foreign scholars, such as self-clamping prefabricated underground continuous walls and "V"-shaped prefabricated underground continuous wall joints, have poor bearing capacity at the joints because the former has no through transverse steel bars at the joints of the two wall sections, and the latter has direct contact between the joints at the interface between the new and old concrete and the soil, which greatly reduces the impermeability of the joints.

[0003] Therefore, it is very necessary to construct transverse reinforcement at the joints of prefabricated ground-anchored walls to improve their bearing capacity and the anti-seepage performance of the joints, and the construction measures should be convenient, safe and quick 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: 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-stopping 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-stopping steel plates are provided on both sides, half of the water-stopping 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-stopping 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 precast concave tube and a precast convex wall concrete concave platform are provided on the lower side of the precast concave wall; a transverse steel bar is provided on the front side of the precast convex wall on one side connected with the precast concave wall, a precast convex wall concrete concave platform matched with the precast concave wall concrete cap 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 cap under the precast concave wall, the steel pin is inserted into the precast concave wall steel sleeve and the precast convex wall steel sleeve, and the steel pin is also inserted into the reserved steel hole to pass through the transverse steel bar.

[0006] The top of the steel pin 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, and the diameter of the nail body is larger than 25 mm.

[0007] The diameter of the transverse 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, 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 bars, the width of the reserved concrete groove should be greater than the width of the transverse steel bars, and appropriate gaps should be reserved to ensure that the transverse steel bars can smoothly enter the reserved concrete groove.

[0009] The waterstop steel plates have 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 the 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, one group with two, which are respectively welded to the top and bottom of 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 precast concave wall concrete pedestal is a right prism extending upward from the bottom of the precast concave wall, and the precast convex wall concrete concave platform is a right prism depression at the bottom of the precast 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 with steel pins comprises:

[0015] Step S1: the production of the prefabricated concave wall, firstly, the prefabricated concave wall steel sleeve is welded at the designed position of the water stop steel plate, the water stop steel plate is connected by transverse steel bars, and the reserved steel holes are welded by connecting steel bars at the designed position between the two rows of transverse steel bars, and the axis of each group of steel holes should coincide, and then the above-mentioned whole is welded to the steel cage of the prefabricated concave wall by transverse steel bars, the formwork is supported and it is noted that the reserved concrete groove and the reserved steel holes are left empty, and the concrete is poured and cured according to the design requirements to complete the production of the prefabricated concave wall;

[0016] Step S2: the production of the prefabricated convex wall, firstly, the prefabricated convex wall steel sleeve is connected by the transverse reinforcement of the prefabricated convex wall, and then welded to the reinforcement cage of the prefabricated convex wall, and 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 close to the joint is less than the designed thickness of the wall body, and its thickness is: designed thickness of the wall body - thickness of the water-stop steel plate × 2-X, where X is for grouting in the gap between the water-stop steel plate and the prefabricated convex wall joint after the installation is completed, generally 1-2 cm, the pouring is completed and maintained, and the production of the prefabricated convex wall is completed;

[0017] 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 to the designated position, use a level to check and adjust to ensure the verticality and horizontality of the wall, and use the same method to lower and install the prefabricated convex wall to 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 transverse steel bars have redundancy 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 bolts 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 for strengthening prefabricated wall joints by connecting transverse steel bars with steel pins and a construction method thereof. The technology is aimed at the large-scale application of green buildings and prefabricated buildings that are vigorously advocated. However, in the field of prefabricated ground-connected walls, the new joints lack a rigid connection that is sufficiently safe and easy to install, and the bearing capacity of the joints is greatly reduced. The present invention constructs transverse steel bars and reserved concrete grooves at the wall joints, reserves steel circular holes on the top, constructs water-stop steel plates on both sides of the wall, and connects them by inserting steel pins through steel sleeves to form internal and external rigid connections at the joints for reinforcement. Grouting is then performed at the gap at the joints to fill the reserved concrete grooves and steel circular holes, so that the two sections of the wall 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, form a reliable reinforcement for the interface between the new and old concrete at the joints, and use the water-stop steel plates to improve the anti-seepage performance of the joints. The wall body is manufactured in the prefabricated component factory, and its bearing capacity 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 manufactured.

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

[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 (without the water stop steel plate on one side).

[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 Cross-sectional view of .

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

[0030] Fig. 9 It is a front schematic diagram of the prefabricated recessed wall joint of the present invention.

[0031] Fig.10 It is a front schematic diagram of the prefabricated convex wall joint of the present invention.

[0032] Fig.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 pedestal 8A, prefabricated convex wall concrete concave pedestal 8B, transverse steel bars 9, transverse steel bars 10, connecting steel bars 11, and prefabricated convex wall transverse steel bars 12. Specific implementation methods

[0035] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. The described embodiments 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 creative work are within the scope of protection of the present invention.

[0036] See also Figure 1-11The present invention provides a prefabricated wall joint strengthened by connecting transverse steel bars with steel pins, the joint comprising a prefabricated concave wall and a prefabricated convex wall and a steel pin. 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 cap; a reserved concrete groove is arranged on the front side of the prefabricated concave wall connected with the prefabricated convex wall, and water-stopping steel plates are arranged on the two side surfaces respectively, half of the water-stopping steel plate is connected with the prefabricated concave wall, and the other half is left empty and connected with the prefabricated convex wall, a prefabricated concave wall steel sleeve is arranged in the middle of the edge of the water-stopping steel plate, and a reserved steel hole is arranged 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 with 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 pin is inserted into the precast concave wall steel sleeve and the precast convex wall steel sleeve, and the steel pin is also inserted into the reserved steel hole to pass through the transverse steel bar.

[0037] The top of the steel pin has a nail cap, and the diameter of the nail cap is 2-3cm larger than the reserved steel hole diameter, and the diameter of the nail body is larger than 25mm. The diameter of the horizontal steel bar is larger than 30mm, the vertical spacing is less than 1.2m, and the exposed length along the wall width is larger than the depth of the reserved concrete groove and not less than 40cm, ensuring that after the installation is completed, the gap at the joint of the two sections of the wall does not exceed 15mm.

[0038] 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. The two waterstop steel plates are respectively embedded in the joints of the prefabricated concave wall on both sides of the wall. The two waterstop steel plates are welded and connected by two rows of transverse steel bars, and the transverse steel bars are welded and connected to the wall steel cage; the thickness of the waterstop 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 are not continuously extended 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 of each group of transverse steel bars along the depth direction. Each section of the reserved steel hole is welded and connected 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 and connected 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 axis of each group coincides. 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.

[0039] The specific implementation steps of the present invention are described below:

[0040] Step S1: the production of the prefabricated concave wall, firstly, the prefabricated concave wall steel sleeve is welded at the designed position of the water stop steel plate, the water stop steel plate is connected by transverse steel bars, and the reserved steel holes are welded by connecting steel bars at the designed position between the two rows of transverse steel bars, and the axis of each group of steel holes should coincide, and then the above-mentioned whole is welded to the steel cage of the prefabricated concave wall by transverse steel bars, the formwork is supported and it is noted that the reserved concrete groove and the reserved steel holes are left empty, and the concrete is poured and cured according to the design requirements to complete the production of the prefabricated concave wall;

[0041] Step S2: the production of the prefabricated convex wall, firstly, the prefabricated convex wall steel sleeve is connected by the transverse reinforcement of the prefabricated convex wall, and then welded to the reinforcement cage of the prefabricated convex wall, and 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 close to the joint is less than the designed thickness of the wall body, and its thickness is: designed thickness of the wall body - thickness of the water-stop steel plate × 2-X, where X is for grouting in the gap between the water-stop steel plate and the prefabricated convex wall joint after the installation is completed, generally 1-2 cm, the pouring is completed and maintained, and the production of the prefabricated convex wall is completed;

[0042] 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 to the designated position, use a level to check and adjust to ensure the verticality and horizontality of the wall, and use the same method to lower and install the prefabricated convex wall to 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 transverse steel bars have redundancy 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;

[0043] Step S4: After the prefabricated concave wall and the prefabricated convex wall are butt-jointed and installed, steel bolts are inserted into the reserved steel holes and steel sleeves to complete the mechanical installation inside and outside the wall;

[0044] 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.

[0045] The working principle of the present invention is described below:

[0046] 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 joints. As stipulated in Article 6.2.5 of the EU standard PrEN-1992-1-1, the shear bearing capacity of the concrete interface poured at different times is calculated as follows:

[0047] V u ≤cf ctd A c +μN+A s f y (μsinα+cosα)

[0048] 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 bearing capacity provided by the steel bars that penetrate the joint, and μN is the shear bearing capacity provided by the pressure at both ends of the wall for the joint. The greater the pressure, the greater the shear bearing capacity provided by this part. In JGJ1-2014 "Design Code for Prefabricated Concrete Structures", under earthquake design conditions, the design value of the shear bearing capacity of the horizontal joints of prefabricated shear walls is calculated as follows:

[0049] V μE =0.6f y A sd +0.8N

[0050] Among them, f y is the tensile design value of ordinary steel bars, A sd is the area of ​​shear reinforcement perpendicular to the joint surface, N is the design value of axial force perpendicular to the joint surface corresponding to the shear design value V, which is positive for pressure and negative for tension.

[0051] 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 run through the joints in the prefabricated wall joints have a very 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 run 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 4 run through the joints, the water-stop steel plates 5 connected to the wall steel cages are connected by steel sleeves 7, and the above two are fixed by steel pins 3 to constrain the deformation of the joints, improve the bearing capacity and anti-seepage performance of the joints, and use the concrete pedestal 8 for convenient positioning and installation, which solves the problem of the difficulty of 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.

[0052] 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 protection scope of the present invention.

Claims

1. A prefabricated wall joint strengthened by connecting transverse reinforcement with 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-stopping steel plate (5), a reserved steel hole (6), a prefabricated concave wall steel sleeve (7A) and a prefabricated concave wall concrete cap (8A); a reserved concrete groove (4) is arranged on the front side of the prefabricated concave wall (1) connected to the prefabricated convex wall (2), and water-stopping steel plates (5) are arranged on both sides; half of the water-stopping 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 arranged in the middle of the edge of the water-stopping steel plate (5), and a reserved steel hole (6) is arranged 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 cap (8B), and a prefabricated concave wall (1) is provided at the bottom of the prefabricated concave wall (1). 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), and the steel pin (3) is also inserted into the reserved steel hole (6) to pass 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, 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 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, and 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 body steel 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 with steel pins according to claim 1, characterized in that: The reserved steel hole (6) does not extend continuously to the bottom of the wall, but is a segmented steel hole with a cut in the middle. The length of the cut should be equal to the height of the reserved concrete groove (4), and there should be a cut 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 bars (10) through the connecting steel bars (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, characterized in that: The prefabricated convex wall steel sleeve (7B) is located on the side of the prefabricated convex wall (2), is horizontally welded through the prefabricated convex wall transverse steel bars (12), and is then welded to the steel cage of the prefabricated convex wall (2). The prefabricated convex wall steel sleeve (7B) has two groups, one group has two, which are respectively welded to the top and bottom of the side of the prefabricated convex wall (2), and the axis of each group coincides. 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 upwardly from the bottom of the prefabricated concave wall (1), and the prefabricated convex wall concrete concave platform (8B) is a right prism depression at the bottom of the prefabricated convex wall (2). The two are completely complementary in size and their function is 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, firstly, welding the prefabricated concave wall steel sleeve (7A) at the designed position of the water stop steel plate (5), connecting the water stop steel plate (5) through the transverse steel bar (10), and welding the reserved steel hole (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 be overlapped, and then the above-mentioned whole is welded to the steel cage of the prefabricated concave wall (1) through the transverse steel bar (10), supporting the formwork and paying attention to leaving space at the reserved concrete groove (4) and the reserved steel hole (6), pouring concrete and curing according to the design requirements, and completing the production of the prefabricated concave wall (1); Step S2: the production of the prefabricated convex wall, firstly, the prefabricated convex wall steel sleeve (7B) is connected through the prefabricated convex wall transverse steel bar (12), and then welded to the steel cage of the prefabricated convex wall (2), and the transverse steel bars (9) are welded to the corresponding positions of the steel cage according to their designed positions, 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, and its thickness is: the designed thickness of the wall body - the thickness of the water-stop steel plate (5) × 2-X, wherein X is for the convenience of grouting into the gap at the joint of the water-stop steel plate (5) and the prefabricated convex wall (2) after the installation is completed, and generally 1-2 cm is taken. After the pouring is completed and maintained, 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 a lifting device to hoist the prefabricated concave wall (1) to the specified position, use a level to check and adjust, ensure the verticality and horizontality of the wall, and 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, and then push the prefabricated convex wall (2) and the prefabricated concave wall (1) to complete the docking, ensure that the transverse 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 plug (3) is inserted into the reserved steel hole (6) and the steel sleeve (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 walls (1) and the prefabricated convex walls (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, thereby improving the anti-seepage performance of the prefabricated wall.

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