A transition node for waler at varying elevations in foundation pit support

Abstract

This utility model discloses a transition node for the waler junction at a change in elevation of a foundation pit support. It aims to provide a method that effectively improves the integrity and stability of the transition point, thereby ensuring the structural safety of the waler junction. It includes a transition column and a transition node unit. The transition column is fixedly installed on the foundation pit support wall. The transition node unit includes: a first support beam waler and a second support beam waler distributed parallel to each other, with the extensions of the first and second support beam walers intersecting and connecting to the transition column; a corner reinforcement zone located between the extensions of the first and second support beam walers, connecting them as a single unit; and longitudinal anchor bars passing through the corner reinforcement zone and connecting the first and second support beam walers.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit engineering technology, specifically to a transition node for the waler at a change in elevation of foundation pit support. Background Technology

[0002] In foundation pit engineering, deep and large foundation pits often employ a combination of retaining walls and horizontal internal support systems to ensure stability and deformation control during construction. The retaining walls and horizontal internal support systems are typically connected by walers located on the sidewalls of the retaining walls, forming a unified load-bearing structure that provides support. For example, Chinese Patent Publication No. CN111188342A describes an invention entitled "Double Waler Concrete Internal Support System with Deformation Compensation Device," which includes external retaining piles, external walers, and internal support beams bracing between the external walers.

[0003] Due to the complex and variable environment surrounding deep and large foundation pits, and the varying protection requirements around the same pit, foundation pit support designs often employ different levels of design measures based on these varying protection requirements. For example, for structures with high protection requirements, such as those adjacent to subway facilities or shallow-foundation residential buildings, the number of support channels can be locally increased (increasing the number of support channels locally in the depth direction) to reduce deformation during excavation and support replacement, thereby enhancing the protection effect. However, locally increasing the number of support channels alters the foundation pit's stress system. Because the supports at the interface of internal support systems with different numbers of support channels are not located on the same plane, the unbalanced force on the retaining wall increases significantly. Areas with inconsistent elevations are prone to uneven force transmission, poor overall integrity, and weak points at the interface, posing a significant threat to the safety of deep and large foundation pits. Currently, reliable transition node designs are lacking for strengthening measures at the elevation transition points of walers in deep and large foundation pits.

[0004] To solve the above problems, there is an urgent need for a transition node for the waler at the elevation change of the foundation pit support. Utility Model Content

[0005] The purpose of this utility model is to provide a foundation pit support waler junction transition node that can effectively improve the integrity and stability of the junction of variable elevation walers, thereby effectively ensuring the structural safety of the junction of variable elevation walers.

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

[0007] A transition node for the waler at a change in elevation of a foundation pit support includes a transition column and a transition node unit, wherein the transition column is fixedly installed on the foundation pit support wall;

[0008] The handover node unit includes:

[0009] The first and second support beam walers are arranged in parallel vertically, and the extensions of the first and second support beam walers intersect and connect with the transition column.

[0010] The corner reinforcement zone is located between the extension section of the first support beam waler and the extension section of the second support beam waler, connecting the two into one unit;

[0011] Longitudinal anchor bars pass through the corner reinforcement zone and connect the first and second support beam walers. In this scheme, the junction unit at the waler transition point of the foundation pit support at the elevation change location reliably connects the first and second support beam walers, which are distributed vertically and horizontally, into a single unit through the corner reinforcement zone and longitudinal anchor bars. This effectively improves the integrity and stability of the waler junction at the elevation change. Furthermore, the longitudinal anchor bars form a clear force transmission path between the first and second support beam walers. Simultaneously, the extensions of the first and second support beam walers intersect and connect with the transition columns, thus forming a crisscrossing junction structure that further enhances the integrity and stability of the waler junction at the elevation change. This ensures the stability and reliability of the force transmission structure at the junction of the first and second support beam walers, guaranteeing the structural safety of the waler junction at the elevation change.

[0012] On the other hand, the structure of the waler junction and transition node at the elevation change point of the foundation pit support in this scheme is simple, the force transmission is clear, the footprint is small, the versatility is good, and the application range is wide.

[0013] Preferably, the transfer column is formed by casting concrete and a column reinforcement cage. The column reinforcement cage includes several vertical main bars extending vertically and several stirrups. The vertical main bars of the transfer column pass sequentially through the extension section of the second support beam waler, the corner reinforcement zone, and the extension section of the first support beam waler. The stirrups include single-leg stirrups and double-leg stirrups, both of which are connected to the retaining wall. Thus, on the one hand, the connection between the transfer column and the retaining wall is ensured by the connection of the single-leg and double-leg stirrups to the retaining wall; on the other hand, the sequential passage of the vertical main bars of the transfer column through the extension section of the second support beam waler, the corner reinforcement zone, and the extension section of the first support beam waler ensures that the transfer column and the junction node unit are connected as a whole, forming a crisscrossed junction structure, thereby further improving the integrity and stability of the junction of the variable elevation walers.

[0014] Preferably, the retaining wall is equipped with several connectors, and the single-leg anchoring stirrups and double-leg anchoring stirrups are all fixedly connected to the connectors. This facilitates the connection between the single-leg anchoring stirrups and double-leg anchoring stirrups and the retaining wall, and ensures the stability of the connection mechanism between the single-leg anchoring stirrups and double-leg anchoring stirrups and the retaining wall.

[0015] Preferably, the connector is a connecting steel bar or a connecting cylinder or a combination of connecting steel bar and connecting cylinder embedded in the retaining wall.

[0016] Preferably, both the first and second support beam waler extensions are provided with a number of longitudinal waler bars, which extend into or pass through the column reinforcement cage. This further improves the stability and reliability of the junction structure between the transfer column and the first and second support beam waler extensions, ensuring a stable and reliable force transmission structure at the junction of the first and second support beam walers.

[0017] Preferably, the concrete of the transition column, the corner reinforcement zone, the extension section of the first support beam waler, and the extension section of the second support beam waler are cast as a single unit. This not only facilitates actual construction but also ensures the integrity and stability of the junction of the walers at different elevations, guaranteeing the structural safety of the junction.

[0018] Preferably, the longitudinal anchor bars include upper anchor bars, lower anchor bars, and connecting anchor bars connecting the upper and lower anchor bars. There are several longitudinal anchor bars, with some having upper anchor bars connected to the first support beam waler and lower anchor bars connected to the extension section of the second support beam waler. The connecting anchor bars are obliquely distributed and pass through the corner reinforcement zone. Similarly, with another portion of the longitudinal anchor bars, the upper anchor bars are connected to the extension section of the first support beam waler and the lower anchor bars are connected to the second support beam waler. The connecting anchor bars are obliquely distributed and pass through the corner reinforcement zone. This not only improves the overall integrity and stability of the junction of the variable elevation walers through the longitudinal anchor bars, but also creates a reliable force transmission path between the first and second support beam walers, further enhancing the stability and reliability of the force transmission structure at the junction of the first and second support beam walers.

[0019] Preferably, the upper anchor bars connected within the first support beam waler are located near the top surface of the first support beam waler; the upper anchor bars connected within the extension section of the first support beam waler are located near the top surface of the extension section of the first support beam waler; the lower anchor bars connected within the second support beam waler are located near the bottom surface of the second support beam waler; and the lower anchor bars connected within the extension section of the second support beam waler are located near the bottom surface of the extension section of the second support beam waler. This extends the length of the longitudinal anchor bars, further improving the stability of the force transmission structure at the junction of the first and second support beam walers.

[0020] Preferably, the left and right sides of the corner reinforcement area are inclined, and the inclination angle of the left and right sides of the corner reinforcement area is 30-45 degrees.

[0021] Preferably, the junction node units comprise several units, distributed sequentially from top to bottom. The extension range of the transition column extends from the top of the first support beam waler extension section of the highest junction node unit to the bottom of the second support beam waler extension section of the lowest junction node unit. This allows the junction node units and the same transition column to form a crisscrossing junction structure, thereby further improving the integrity and stability of the junction of the variable elevation walers.

[0022] The beneficial effects of this utility model are as follows: the junction node unit reliably connects the first and second support beam walers, which are distributed vertically and horizontally, into a single unit through the corner reinforcement zone and longitudinal anchor bars, effectively improving the integrity and stability of the junction of the variable elevation walers; and the longitudinal anchor bars can form a clear force transmission path between the first and second support beam walers; at the same time, the extensions of the first and second support beam walers intersect and connect with the transition column, thereby connecting the junction node unit into a single unit through the transition column, forming a crisscrossing junction structure, further effectively improving the integrity and stability of the junction of the variable elevation walers; ensuring the stability and reliability of the force transmission structure at the junction of the first and second support beam walers, and ensuring the structural safety of the junction of the variable elevation walers. Attached Figure Description

[0023] Figure 1 This is a structural schematic diagram of a transition node for the waler at a change in elevation of a foundation pit support, according to this utility model.

[0024] Figure 2 yes Figure 1 A schematic diagram of a cross-sectional structure at point AA.

[0025] Figure 3 yes Figure 1 A schematic diagram of a cross-sectional structure at point BB.

[0026] Figure 4 This is a schematic diagram of a uniformly distributed cross-sectional structure at the connector of this utility model.

[0027] In the picture:

[0028] Transfer column 1, vertical main reinforcement 1.1, stirrups 1.2, anchorage single-leg stirrups 1.21, anchorage double-leg stirrups 1.22;

[0029] The junction node unit 2 includes: first support beam waler 2.1, first support beam waler extension 2.1.1, second support beam waler 2.2, second support beam waler extension 2.2.1, corner reinforcement zone 2.3, longitudinal anchor bar 2.4, upper anchor bar 2.4.1, lower anchor bar 2.4.2, and connecting anchor bar 2.4.3.

[0030] Support wall 3;

[0031] Connector 4, connecting steel bar 4.1, connecting cylinder 4.2. Detailed Implementation

[0032] Specific Implementation Example 1, such as Figure 1 , Figure 2 As shown, a transition node for the waler at a change in elevation in a foundation pit support includes a transition column 1 and a transition node unit 2. The transition column 1 is fixedly installed on the retaining wall 3 of the foundation pit. The transition column 1 extends vertically.

[0033] The junction node unit 2 includes a corner reinforcement zone 2.3, longitudinal anchor bars 2.4, and a first support beam waler 2.1 and a second support beam waler 2.2 distributed vertically in parallel. The first support beam waler 2.1 includes an extension section 2.1.1, and the second support beam waler 2.2 includes an extension section 2.2.1. The extension sections of the first support beam waler 2.1 and the second support beam waler 2.2 intersect and connect with the transition column 1.

[0034] The corner reinforcement zone 2.3 is located between the extension section 2.1.1 of the first support beam waler and the extension section 2.2.1 of the second support beam waler, and the corner reinforcement zone 2.3 connects the extension section 2.1.1 of the first support beam waler and the extension section 2.2.1 of the second support beam waler into one unit.

[0035] The longitudinal anchor bar 2.4 passes through the corner reinforcement zone 2.3 and connects the first support beam waler 2.1 and the second support beam waler 2.2.

[0036] In this embodiment, the junction node unit 2 of the waler junction at the elevation change point of the foundation pit support connects the first support beam waler 2.1 and the second support beam waler 2.2, which are distributed vertically and horizontally, stably and reliably through the corner reinforcement zone 2.3 and the longitudinal anchor bar 2.4, effectively improving the integrity and stability of the waler junction at the elevation change point. Furthermore, the longitudinal anchor bar 2.4 forms a clear force transmission path between the first support beam waler 2.1 and the second support beam waler 2.2. Simultaneously, the extensions of the first support beam waler 2.1 and the second support beam waler 2.2 intersect and connect with the conversion column 1, thereby connecting the junction node unit 2 with the conversion column 1 to form a crisscrossing junction structure, further effectively improving the integrity and stability of the waler junction at the elevation change point. This ensures the stability and reliability of the force transmission structure at the junction of the first support beam waler 2.1 and the second support beam waler 2.2, guaranteeing the structural safety of the waler junction at the elevation change point.

[0037] On the other hand, the structure of the waler junction and transition node at the elevation change point of the foundation pit support in this scheme is simple, the force transmission is clear, the footprint is small, the versatility is good, and the application range is wide.

[0038] Specific embodiment two, such as Figure 1 , Figure 2 As shown, a transition node for the waler at a change in elevation in a foundation pit support includes a transition column 1 and a transition node unit 2. The transition column 1 is fixedly installed on the retaining wall 3 of the foundation pit. The transition column 1 extends vertically.

[0039] The junction node unit 2 includes a corner reinforcement zone 2.3, longitudinal anchor bars 2.4, and two parallel supporting beam walers 2.1 and 2.2. The first supporting beam waler 2.1 includes an extension 2.1.1, and the second supporting beam waler 2.2 includes an extension 2.2.1. The first supporting beam waler 2.1 in the same junction node unit 2 is positioned higher than the second supporting beam waler 2.2. The extensions of the first and second supporting beam walers 2.1 and 2.2 intersect and connect with the transition column 1.

[0040] The corner reinforcement zone 2.3 is located between the extension section 2.1.1 of the first support beam waler and the extension section 2.2.1 of the second support beam waler, and the corner reinforcement zone 2.3 connects the extension section 2.1.1 of the first support beam waler and the extension section 2.2.1 of the second support beam waler into one unit.

[0041] The longitudinal anchor bar 2.4 passes through the corner reinforcement zone 2.3 and connects the first support beam waler 2.1 and the second support beam waler 2.2.

[0042] In this embodiment, the transfer column 1 is formed by casting concrete and a column reinforcement cage. The first supporting beam waler 2.1 and the first supporting beam waler extension 2.1.1 are formed by casting concrete and a beam reinforcement cage. The second supporting beam waler 2.2 and the second supporting beam waler extension 2.2.1 are formed by casting concrete and a beam reinforcement cage. The corner reinforcement zone 2.3 is formed by casting concrete or by casting concrete and reinforcement.

[0043] In this embodiment, the junction node unit 2 of the waler junction at the elevation change point of the foundation pit support connects the first support beam waler 2.1 and the second support beam waler 2.2, which are distributed vertically and horizontally, stably and reliably through the corner reinforcement zone 2.3 and the longitudinal anchor bar 2.4, effectively improving the integrity and stability of the waler junction at the elevation change point. Furthermore, the longitudinal anchor bar 2.4 forms a clear force transmission path between the first support beam waler 2.1 and the second support beam waler 2.2. Simultaneously, the extensions of the first support beam waler 2.1 and the second support beam waler 2.2 intersect and connect with the conversion column 1, thereby connecting the junction node unit 2 with the conversion column 1 to form a crisscrossing junction structure, further effectively improving the integrity and stability of the waler junction at the elevation change point. This ensures the stability and reliability of the force transmission structure at the junction of the first support beam waler 2.1 and the second support beam waler 2.2, guaranteeing the structural safety of the waler junction at the elevation change point.

[0044] Furthermore, such as Figure 1 , Figure 2 As shown, the concrete of the transition column 1, the corner reinforcement zone 2.3, the extension section 2.1.1 of the first support beam waler, and the extension section 2.2.1 of the second support beam waler are integrally cast. This not only facilitates actual construction but also ensures the integrity and stability of the junction of the variable elevation walers, guaranteeing the structural safety of the junction.

[0045] Furthermore, such as Figure 1 As shown, both the first support beam waler extension section 2.1.1 and the second support beam waler extension section 2.2.1 are provided with several waler longitudinal bars. Specifically, the beam reinforcement cage in the first support beam waler extension section 2.1.1 and the second support beam waler extension section 2.2.1 includes several waler longitudinal bars. The waler longitudinal bars in the first support beam waler extension section 2.1.1 and the second support beam waler extension section 2.2.1 extend into or pass through the column reinforcement cage. In this way, the stability and reliability of the junction structure between the transfer column 1 and the first support beam waler extension section 2.1.1 and the second support beam waler extension section 2.2.1 can be further improved, ensuring the stability and reliability of the force transmission structure at the junction of the first support beam waler 2.1 and the second support beam waler 2.2.

[0046] Furthermore, such as Figure 1 As shown, the longitudinal anchor bar 2.4 includes an upper anchor bar 2.4.1, a lower anchor bar 2.4.2, and a connecting anchor bar 2.4.3 that connects the upper anchor bar 2.4.1 and the lower anchor bar 2.4.2. The upper anchor bar 2.4.1, the lower anchor bar 2.4.2, and the connecting anchor bar 2.4.3 are an integral bent structure. The longitudinal anchor bars 2.4 consist of several bars. For a portion of the longitudinal anchor bars 2.4, the upper anchor bars 2.4.1 are connected to the first support beam waler 2.1, and the lower anchor bars 2.4.2 are connected to the second support beam waler extension 2.2.1. The connecting anchor bars 2.4.3 are distributed obliquely and pass through the corner reinforcement zone 2.3. For another portion of the longitudinal anchor bars 2.4, the upper anchor bars 2.4.1 are connected to the first support beam waler extension 2.1.1, and the lower anchor bars 2.4.2 are connected to the second support beam waler 2.2. The connecting anchor bars 2.4.3 are distributed obliquely and pass through the corner reinforcement zone 2.3. In this way, not only can the integrity and stability of the junction of the variable elevation walers be improved by the longitudinal anchor bars 2.4, but also the longitudinal anchor bars 2.4 can form a reliable force transmission path between the first support beam waler 2.1 and the second support beam waler 2.2, further improving the stability and reliability of the force transmission structure at the junction of the first support beam waler 2.1 and the second support beam waler 2.2.

[0047] In this embodiment, the upper anchor bar 2.4.1 and the lower anchor bar 2.4.2 are horizontally distributed and parallel to each other. The connecting anchor bar 2.4.3 is inclined, with an inclination angle of 30-45 degrees.

[0048] The left and right sides of the corner reinforcement zone 2.3 are inclined, and the inclination angle of the left and right sides of the corner reinforcement zone 2.3 is 30-45 degrees. The inclination angle of the connecting anchor bar 2.4.3 is consistent with the inclination angle of the adjacent corner reinforcement zone 2.3 side.

[0049] The longitudinal anchor bars 2.4 are arranged in two rows. One row of longitudinal anchor bars 2.4 is distributed on one side of the transfer column 1, and the other row of longitudinal anchor bars 2.4 is distributed on the opposite side of the transfer column 1. Each longitudinal anchor bar 2.4 in the same row extends along the width direction of the first support beam waler 2.1. In one row of longitudinal anchor bars 2.4, the upper anchor bar 2.4.1 is connected to the first support beam waler 2.1, and the lower anchor bar 2.4.2 is connected to the extension section 2.2.1 of the second support beam waler. The connecting anchor bars 2.4.3 are inclined and pass through the corner reinforcement zone 2.3. In the other row of longitudinal anchor bars 2.4, the upper anchor bar 2.4.1 is connected to the extension section 2.1.1 of the first support beam waler, and the lower anchor bar 2.4.2 is connected to the second support beam waler 2.2. The connecting anchor bars 2.4.3 are inclined and pass through the corner reinforcement zone 2.3.

[0050] Furthermore, such as Figure 1 As shown, the upper anchor bar 2.4.1 connected within the first support beam waler 2.1 is near the top surface of the first support beam waler 2.1. The upper anchor bar 2.4.1 connected within the extension section 2.1.1 of the first support beam waler is also near the top surface of the extension section 2.1.1. The lower anchor bar 2.4.2 connected within the second support beam waler 2.2 is near the bottom surface of the second support beam waler 2.2. The lower anchor bar 2.4.2 connected within the extension section 2.2.1 of the second support beam waler is also near the bottom surface of the extension section 2.2.1. This extends the length of the longitudinal anchor bar 2.4, further improving the stability of the force transmission structure at the junction of the first support beam waler 2.1 and the second support beam waler 2.2.

[0051] Furthermore, such as Figure 1 , Figure 2 , Figure 3As shown, the column reinforcement cage includes several vertical main bars 1.1 extending vertically and several stirrups 1.2. The vertical main bars 1.1 of the transfer column pass sequentially through the extension section 2.2.1 of the second supporting beam waler, the corner reinforcement zone 2.3, and the extension section 2.1.1 of the first supporting beam waler. In this embodiment, the vertical main bars 1.1 of the transfer column pass sequentially through the beam reinforcement cage of the extension section 2.2.1 of the second supporting beam waler and the extension section 2.1.1 of the first supporting beam. The vertical main bars 1.1 of the transfer column can be arranged in a single row or multiple rows. The specific number of rows of the vertical main bars 1.1 of the transfer column can be arranged according to actual needs, which has the characteristics of high flexibility and high strength. By having the vertical main reinforcement 1.1 of the conversion column pass sequentially through the extension section 2.2.1 of the second support beam waler, the corner reinforcement area 2.3, and the extension section 2.1.1 of the first support beam waler, the conversion column 1 and the junction node unit 2 are connected as one, forming a crisscrossing junction structure, thereby further improving the integrity and stability of the junction of the variable elevation walers.

[0052] Furthermore, such as Figure 3 As shown, the stirrups 1.2 of the column reinforcement cage include single-leg stirrups 1.21 and double-leg stirrups 1.22. Both the single-leg stirrups 1.21 and the double-leg stirrups 1.22 are connected to the retaining wall 3. Thus, the connection between the transfer column 1 and the retaining wall 3 is ensured by connecting the single-leg stirrups 1.21 and the double-leg stirrups 1.22 to the retaining wall 3.

[0053] Furthermore, such as Figure 3 , Figure 4 As shown, several connectors 4 are provided inside the retaining wall 3. Both the single-leg anchoring stirrup 1.21 and the double-leg anchoring stirrup 1.22 are fixedly connected to the connectors 4. This facilitates the connection of the single-leg anchoring stirrup 1.21 and the double-leg anchoring stirrup 1.22 to the retaining wall 3 and ensures the stability of the connection mechanism between the single-leg anchoring stirrup 1.21 and the double-leg anchoring stirrup 1.22 and the retaining wall 3.

[0054] Furthermore, connector 4 adopts the following method,

[0055] In one example, such as Figure 4 As shown, the connector 4 is a combination of the connecting steel bar 4.1 and the connecting cylinder 4.2 embedded in the retaining wall 3. Specifically, the connecting cylinder is fixed to one end of the connecting steel bar near the wall surface of the retaining wall 3. One end of the connecting cylinder is flush with the wall surface of the retaining wall 3 or extends to the outside of the retaining wall 3. One end of the anchoring single-leg stirrup 1.21 extends into the connecting cylinder, and the anchoring single-leg stirrup 1.21 is connected to the connecting cylinder by thread, welding, or adhesive. One end of the anchoring double-leg stirrup 1.22 extends into the connecting cylinder, and the anchoring double-leg stirrup 1.22 is connected to the connecting cylinder by thread, welding, or adhesive.

[0056] In another example, the connector 4 is a connector cylinder embedded in the retaining wall 3. One end of the connector cylinder is flush with the wall surface of the retaining wall 3 or extends to the outside of the retaining wall 3. One end of the anchoring single-leg stirrup 1.21 extends into the connector cylinder, and the anchoring single-leg stirrup 1.21 is connected to the connector cylinder by thread, welding, or adhesive. One end of the anchoring double-leg stirrup 1.22 extends into the connector cylinder, and the anchoring double-leg stirrup 1.22 is connected to the connector cylinder by thread, welding, or adhesive.

[0057] In the third example, the connector 4 is a connecting steel bar embedded in the retaining wall 3, with one end extending to the outside of the retaining wall 3. One end of the anchoring single-leg stirrup 1.21 is welded to the connecting steel bar. One end of the anchoring double-leg stirrup 1.22 is welded to the connecting steel bar.

[0058] In this specific embodiment, the remaining structure is the same as in specific embodiment one or specific embodiment two, except that...

[0059] like Figure 1 As shown, the junction node unit 2 comprises several units. These junction node units 2 are distributed sequentially from top to bottom. The extension range of the transition column 1 extends from the top of the first support beam waler extension section 2.1.1 of the highest junction node unit 2 to the bottom of the second support beam waler extension section 2.2.1 of the lowest junction node unit 2. In this way, each junction node unit 2 and the same transition column 1 can form a crisscrossing junction structure, thereby further and effectively improving the integrity and stability of the junction of the variable elevation walers.

[0060] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A transfer joint for a coaming of a foundation pit support of varying elevation, characterized in that, Includes transition columns and junction node units, with the transition columns fixedly installed on the retaining wall of the foundation pit; The handover node unit includes: The first and second support beam walers are arranged in parallel vertically, and the extensions of the first and second support beam walers intersect and connect with the transition column. The corner reinforcement zone is located between the extension section of the first support beam waler and the extension section of the second support beam waler, connecting the two into one unit; Longitudinal anchor bars pass through the corner reinforcement zone and connect the first support beam waler to the second support beam waler.

2. The transfer joint of claim 1, wherein, The transfer column is formed by pouring concrete and a column reinforcement cage. The column reinforcement cage includes several vertical main bars of the transfer column that extend vertically and several stirrups. The vertical main bars of the transfer column pass through the extension section of the second support beam waler, the corner reinforcement zone and the extension section of the first support beam waler in sequence. The stirrups include single-leg stirrups and double-leg stirrups, and both single-leg stirrups and double-leg stirrups are connected to the retaining wall.

3. The waler transition node at a change in elevation of a foundation pit support according to claim 2, characterized in that, The retaining wall is equipped with several connectors, and the single-limb anchoring stirrups and double-limb anchoring stirrups are fixedly connected to the connectors.

4. The waler transition node at a change in elevation of a foundation pit support according to claim 3, characterized in that, The connector is a connecting steel bar or a connecting cylinder or a combination of connecting steel bar and connecting cylinder embedded in the retaining wall.

5. The transfer joint of a cofferdam purlin at a variable elevation of a foundation pit support according to claim 2 or 3 or 4, characterized in that, Both the first and second support beam waler extension sections are provided with several waler longitudinal bars, which extend into or pass through the column reinforcement cage.

6. The transfer joint of a cofferdam purlin at a variable elevation of a foundation pit support according to claim 1 or 2 or 3 or 4, characterized in that, The concrete of the conversion column, the corner reinforcement area, the extension section of the first support beam waler, and the extension section of the second support beam waler are integrally cast.

7. The transfer joint of a cofferdam purlin at a variable elevation of a foundation pit support according to claim 1 or 2 or 3 or 4, characterized in that, The longitudinal anchor bars include upper anchor bars, lower anchor bars, and connecting anchor bars connecting the upper and lower anchor bars. There are several longitudinal anchor bars. Among them, the upper anchor bars of a portion of the longitudinal anchor bars are connected to the waler of the first support beam, and the lower anchor bars are connected to the extension section of the waler of the second support beam. The connecting anchor bars are distributed obliquely and pass through the corner reinforcement zone. The upper anchor bars of another portion of the longitudinal anchor bars are connected to the extension section of the waler of the first support beam, and the lower anchor bars are connected to the waler of the second support beam. The connecting anchor bars are distributed obliquely and pass through the corner reinforcement zone.

8. The waler transition node at a change in elevation of a foundation pit support according to claim 7, characterized in that, The upper anchor bar connected within the first support beam waler is close to the top surface of the first support beam waler; the upper anchor bar connected within the extension section of the first support beam waler is close to the top surface of the extension section of the first support beam waler; the lower anchor bar connected within the second support beam waler is close to the bottom surface of the second support beam waler; and the lower anchor bar connected within the extension section of the second support beam waler is close to the bottom surface of the extension section of the second support beam waler.

9. The transfer joint of a cofferdam purlin at a variable elevation of a foundation pit support according to claim 1 or 2 or 3 or 4, characterized in that, The left and right sides of the corner reinforcement zone are inclined, and the inclination angle of the left and right sides of the corner reinforcement zone is 30-45 degrees.

10. The transfer joint of a cofferdam purlin at a variable elevation of a foundation pit support according to claim 1 or 2 or 3 or 4, characterized in that, The junction node unit includes several units, and each junction node unit is distributed sequentially from top to bottom. The extension range of the conversion column extends from the top of the first support beam waler extension section of the highest junction node unit to the bottom of the second support beam waler extension section of the lowest junction node unit.

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