Lateral counterweight self-balancing underground diaphragm wall enclosure structure and construction method thereof

Abstract

According to the lateral balance weight self-balancing underground diaphragm wall enclosure structure and the construction method thereof, a plurality of lateral balance weights of the enclosure structure are arranged at intervals along the outer side of a connecting beam, a plurality of embedded steel bars are arranged in the lateral balance weights at intervals, the other ends of the embedded steel bars extend to the connecting beam, the lateral balance weights and the connecting beam are cast into a whole in situ, and the lateral balance weights and the connecting beam are arranged in parallel. The intelligent hydraulic device is arranged at the bottom of the lateral balancing weight, and the data storage and transmission device and the intelligent hydraulic device are both in signal connection with the control system. The method comprises the steps that open excavation grooving is conducted on the edge of the outer side of the underground diaphragm wall to form a plurality of lateral balance weight grooves formed at intervals, intelligent hydraulic devices are installed at the bottoms of the lateral balance weight grooves, embedded steel bars are erected in the lateral balance weight grooves, connecting beams and lateral balance weight blocks are integrally cast in situ, and a control system obtains the bottom pressure value of the lateral balance weight blocks in real time; when the monitored pressure value is increased and is close to a threshold value, the control system controls a hydraulic cylinder of the intelligent hydraulic device to extend; and when the pressure value is reduced, an external balancing weight is placed at the top of the lateral balancing weight.

Description

Technical Field

[0001] This invention relates to the field of deep foundation pit diaphragm wall construction technology, and particularly to a lateral counterweight self-balancing diaphragm wall structure and its construction method. Background Technology

[0002] Diaphragm walls are a common retaining structure in deep foundation pit construction. Their functions include retaining soil, bearing load, preventing seepage, and waterproofing. During the excavation of deep foundation pits, as the soil inside the pit is continuously excavated, the pressure difference between the two sides of the diaphragm wall increases. The diaphragm wall has potential dangers such as overturning and instability in the pit. At the same time, as the depth of the pit increases, the presence of groundwater will generate upward buoyancy, increasing the load on the lateral support structure. Furthermore, if the soil at the bottom of the pit becomes unstable due to water pressure, it will weaken the support for the lower part of the support structure, leading to large lateral displacement or even overturning.

[0003] To improve the resistance of diaphragm walls to water and soil pressure, the most common ways to strengthen diaphragm walls include increasing concrete strength, appropriately increasing reinforcement ratio, and enhancing construction quality. However, these methods can easily lead to increased costs for construction materials and management personnel. Summary of the Invention

[0004] Existing methods for strengthening diaphragm walls often lead to increased costs for construction materials and management personnel. The purpose of this invention is to provide a lateral counterweight self-balancing diaphragm wall retaining structure and its construction method.

[0005] The technical solution adopted by this invention to solve its technical problem is: a lateral counterweight self-balancing diaphragm wall retaining structure, which includes: a diaphragm wall, a connecting beam, lateral counterweights, a data storage and transmission device, an intelligent hydraulic device, and a control system. The connecting beam is connected to the top of the diaphragm wall. Multiple lateral counterweights are spaced apart along the outside of the connecting beam. Multiple pre-embedded steel bars are horizontally spaced inside each lateral counterweight. The other end of the pre-embedded steel bars extends to the connecting beam. The multiple lateral counterweights and the connecting beam are cast in place as a whole. The intelligent hydraulic device is located at the bottom of the lateral counterweights and is signal-connected to the data storage and transmission device. Both the data storage and transmission device and the intelligent hydraulic device are signal-connected to the control system.

[0006] The lateral counterweight self-balancing diaphragm wall retaining structure of this invention comprises multiple lateral counterweight blocks spaced apart along the outer side of a connecting beam. Multiple pre-embedded steel bars are horizontally installed within each lateral counterweight block, with the other end of each bar extending into the connecting beam. The lateral counterweight blocks and the connecting beam are integrally cast in place. After curing, the lateral counterweight blocks, through the pre-embedded steel bars, form an integral load-bearing structure with the connecting beam. The multiple lateral counterweight blocks effectively apply a stable counterweight moment "behind" the diaphragm wall, directed towards the pit. This counterweight moment is opposite in direction to the overturning moment generated by the external soil and water pressure, effectively offsetting a portion of the overturning moment caused by the external soil and water pressure. A data storage and transmission device is installed at the bottom of each lateral counterweight block. The intelligent hydraulic device enables the diaphragm wall, connecting beams, lateral counterweights, data storage and transmission devices, and the intelligent hydraulic device to jointly form a dynamic equilibrium force system. By adding counterweights to the outside of the diaphragm wall and combining them with intelligent hydraulic adjustment, the diaphragm wall retaining structure is dynamically adjusted to resist the inward horizontal pressure of the soil outside the foundation pit and the buoyancy caused by groundwater, thereby achieving a self-balancing effect. Moreover, by monitoring the pressure on the retaining structure in real time through the intelligent hydraulic device, the performance of the diaphragm wall retaining structure in resisting water and soil pressure is improved, and the reinforcement ratio of the diaphragm wall and the amount of high-grade concrete used are reduced, which saves construction materials and ensures the safety of the retaining structure.

[0007] Furthermore, multiple lateral counterweights are spaced apart along the outer edge of the diaphragm wall, with a 3-meter interval between adjacent lateral counterweights.

[0008] Furthermore, it also includes a cushion layer, which is placed between the soil outside the foundation pit and the lateral counterweight.

[0009] Furthermore, it also includes an external counterweight, which is made of concrete and is placed on top of the lateral counterweight.

[0010] Furthermore, the intelligent hydraulic device includes a hydraulic pump, a hydraulic cylinder, a sensor, and a controller, with the sensor and controller connected to the control system via signals.

[0011] In addition, the present invention also provides a construction method for a lateral counterweight self-balancing diaphragm wall retaining structure, the steps of which are as follows:

[0012] S1: After the concrete pouring of the diaphragm wall is completed, a trench is excavated at the outer edge of the diaphragm wall to form multiple lateral counterweight trenches at intervals. Intelligent hydraulic devices and data storage and transmission devices are installed at the bottom of the lateral counterweight trenches. Embedded steel bars are laid in the lateral counterweight trenches. The other end of the embedded steel bars extends to the connecting beam to be poured at the top of the diaphragm wall. The connecting beam and multiple lateral counterweight blocks are cast in place as a whole.

[0013] S2: Connect the intelligent hydraulic device, data storage and transmission device and control system signals. The control system sets the pressure balance threshold and acquires the pressure value at the bottom of the side counterweight in real time. When the monitored pressure value increases and approaches the threshold, the control system controls the hydraulic cylinder of the intelligent hydraulic device to extend. When the monitored pressure value decreases, an additional counterweight is placed on top of the side counterweight.

[0014] The construction method of the lateral counterweight self-balancing diaphragm wall retaining structure of the present invention involves firstly, excavating a trench at the outer edge of the diaphragm wall to form multiple spaced lateral counterweight trenches. An intelligent hydraulic device and a data storage and transmission device are installed at the bottom of the lateral counterweight trenches. Pre-embedded reinforcing bars are then laid within the lateral counterweight trenches, with the other end of the pre-embedded reinforcing bars extending into the connecting beam to be cast at the top of the diaphragm wall. The connecting beam and multiple lateral counterweight blocks are then integrally cast in place. The lateral counterweight blocks, through the pre-embedded reinforcing bars, form an integral load-bearing structure with the connecting beam. These multiple lateral counterweight blocks effectively apply a stable counterweight moment "behind" the diaphragm wall, directed towards the pit. This counterweight moment is opposite in direction to the overturning moment generated by the water and soil pressure outside the pit, effectively resisting... Part of the overturning moment generated by the water and soil pressure outside the pit is eliminated; the intelligent hydraulic device, data storage and transmission device are connected to the control system, and the control system obtains the pressure value at the bottom of the lateral counterweight in real time. When the monitored pressure value increases and approaches the threshold, the control system controls the hydraulic cylinder of the intelligent hydraulic device to extend; when the monitored pressure value decreases, an additional counterweight is placed on top of the lateral counterweight, so that construction personnel can adjust the counterweight scheme according to the pressure change; by adding counterweights on the outside of the diaphragm wall and combining intelligent hydraulic adjustment, the diaphragm wall retaining structure is dynamically adjusted, thereby resisting the inward horizontal pressure of the soil outside the pit and the buoyancy caused by groundwater, thus achieving a self-balancing effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an embodiment of the lateral counterweight self-balancing underground continuous wall retaining structure of the present invention;

[0016] Figure 2 for Figure 1 AA sectional view.

[0017] The numbers in the diagram are as follows:

[0018] 11. Connecting beam; 12. Lateral counterweight; 14. Embedded steel bars; 15. Intelligent hydraulic device; 16. Data storage and transmission device; 17. Subbase. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clearly illustrate the embodiments of the present invention. For ease of description, the terms "upper" and "lower" used below are consistent with the upper and lower directions in the drawings, but this should not be construed as a limitation of the technical solution of the present invention.

[0020] In foundation pit engineering, the connecting beam 11 (usually referring to horizontal support components within the foundation pit, such as capping beams, lintels, and walers) is a horizontal component that connects the vertical support diaphragm wall and forms an integral whole with it to share the load. The following section combines... Figure 1 and Figure 2 The present invention describes a lateral counterweight self-balancing diaphragm wall retaining structure, comprising: a diaphragm wall (not shown in the figure), a connecting beam 11, lateral counterweight blocks 12, a data storage and transmission device 16, an intelligent hydraulic device 15, and a control system. The connecting beam 11 is connected to the top of the diaphragm wall. Multiple lateral counterweight blocks 12 are spaced apart along the outer side of the connecting beam 11 (here, the outer side refers to the side away from the foundation pit). Multiple pre-embedded steel bars 14 are horizontally spaced inside each lateral counterweight block 12, and the other end of the pre-embedded steel bars 14 extends to the connecting beam 11. The multiple lateral counterweight blocks 12 and the connecting beam 11 are integrally cast in place. The intelligent hydraulic device 15 is located at the bottom of the lateral counterweight blocks 12 and is signal-connected to the data storage and transmission device 16. Both the data storage and transmission device 16 and the intelligent hydraulic device 15 are signal-connected to the control system.

[0021] The lateral counterweight self-balancing diaphragm wall retaining structure of the present invention comprises multiple lateral counterweight blocks 12 spaced apart along the outer side of the connecting beam 11. Multiple pre-embedded steel bars 14 are horizontally arranged within each lateral counterweight block 12, with the other end of each pre-embedded steel bar 14 extending into the connecting beam 11. The multiple lateral counterweight blocks 12 and the connecting beam 11 are integrally cast in place. After curing, the lateral counterweight blocks 12, through the pre-embedded steel bars 14, form an integral load-bearing structure with the connecting beam 11. The multiple lateral counterweight blocks 12 effectively apply a stable counterweight moment "behind" the diaphragm wall, directed towards the pit. This counterweight moment is opposite in direction to the overturning moment generated by the water and soil pressure outside the pit, effectively offsetting a portion of the overturning moment generated by the water and soil pressure outside the pit. Each lateral counterweight block 12 has a data storage device installed at its bottom. The storage and transmission device 16 and the intelligent hydraulic device 15 together form a dynamic equilibrium force system, comprising the diaphragm wall, connecting beam 11, lateral counterweight 12, data storage and transmission device 16, and intelligent hydraulic device 15. By adding counterweights to the outside of the diaphragm wall and combining them with intelligent hydraulic adjustment, the diaphragm wall retaining structure is dynamically adjusted to resist the inward horizontal pressure of the soil outside the foundation pit and the buoyancy caused by groundwater, thereby achieving a self-balancing effect. Moreover, by monitoring the pressure on the retaining structure in real time through the intelligent hydraulic device 15, the performance of the diaphragm wall retaining structure in resisting water and soil pressure is improved, and the reinforcement ratio of the diaphragm wall and the amount of high-grade concrete used are reduced, which saves construction materials and ensures the safety of the retaining structure.

[0022] like Figure 1 As shown, multiple lateral counterweights 12 are spaced apart along the outer edge of the diaphragm wall, with a 3-meter interval between adjacent lateral counterweights 12. One end of the pre-embedded steel bar 14 is placed inside the lateral counterweight 12, and the other end is exposed inside the connecting beam 11 and integrally cast with it. In this embodiment, the dimensions of the lateral counterweight 12 are 1.6m × 1.8m × 1.6m (length × width × height).

[0023] like Figure 2 As shown, the lateral counterweight self-balancing underground continuous wall retaining structure also includes a cushion layer 17, which is set between the soil outside the foundation pit and the lateral counterweight block 12. The cushion layer 17 can be made of concrete and is used to support the lateral counterweight block 12 and the intelligent hydraulic device 15.

[0024] like Figure 2 As shown, the lateral counterweight self-balancing underground continuous wall retaining structure also includes an external counterweight block, which is made of concrete and does not have steel reinforcement. The external counterweight block is placed on top of the lateral counterweight block 12.

[0025] like Figure 2As shown, the intelligent hydraulic device 15 includes a hydraulic pump, a hydraulic cylinder, sensors, and a controller. The sensors and controller are connected to the control system via signals. The intelligent hydraulic device 15 has a built-in control algorithm that can sense its own state, adapt to environmental changes, and automatically adjust the control strategy according to changes in load or parameters, thereby achieving precise adaptive adjustment of the counterweight.

[0026] Combination Figure 1 and Figure 2 The construction method of the lateral counterweight self-balancing diaphragm wall retaining structure of the present invention is described below, with the specific steps as follows:

[0027] S1: After the concrete pouring of the diaphragm wall is completed, a trench is excavated at the outer edge of the diaphragm wall to form multiple lateral counterweight trenches at intervals. A smart hydraulic device 15 and a data storage and transmission device 16 are installed at the bottom of the lateral counterweight trenches. Embedded steel bars 14 are laid in the lateral counterweight trenches. The other end of the embedded steel bars 14 extends into the connecting beam 11 to be poured at the top of the diaphragm wall. The connecting beam 11 and multiple lateral counterweight blocks 12 are cast in place as a whole.

[0028] S2: Connect the intelligent hydraulic device 15, the data storage and transmission device 16 to the control system. The control system sets the pressure balance threshold and acquires the pressure value at the bottom of the side counterweight 12 in real time. When the monitored pressure value increases and approaches the threshold, the control system controls the hydraulic cylinder of the intelligent hydraulic device 15 to extend. When the monitored pressure value decreases, an additional counterweight is placed on top of the side counterweight 12.

[0029] The construction method of the lateral counterweight self-balancing diaphragm wall retaining structure of the present invention involves firstly, excavating a trench at the outer edge of the diaphragm wall to form multiple lateral counterweight trenches spaced apart. An intelligent hydraulic device 15 and a data storage and transmission device 16 are installed at the bottom of the lateral counterweight trenches. Pre-embedded reinforcing bars 14 are erected within the lateral counterweight trenches, with the other end of the pre-embedded reinforcing bars 14 extending into the connecting beam 11 to be cast at the top of the diaphragm wall. The connecting beam 11 and multiple lateral counterweight blocks 12 are then cast in place. The lateral counterweight blocks 12 form an integral load-bearing structure with the connecting beam 11 through the pre-embedded reinforcing bars 14. The multiple lateral counterweight blocks 12 effectively apply a stable counterweight moment "behind" the diaphragm wall, directed towards the pit. This counterweight moment is opposite in direction to the overturning moment generated by the water and soil pressure outside the pit. This can effectively offset some of the overturning moment generated by the water and soil pressure outside the pit; the intelligent hydraulic device 15, the data storage and transmission device 16 are connected to the control system signal, and the control system obtains the pressure value at the bottom of the lateral counterweight 12 in real time. When the monitored pressure value increases and approaches the threshold, the control system controls the hydraulic cylinder of the intelligent hydraulic device 15 to extend; when the monitored pressure value decreases, an additional counterweight is placed on top of the lateral counterweight 12, so that construction personnel can adjust the counterweight scheme according to the pressure change; by adding counterweights on the outside of the underground continuous wall and combining intelligent hydraulic adjustment, the underground continuous wall retaining structure is dynamically adjusted, thereby resisting the horizontal pressure of the soil outside the pit and the buoyancy caused by the groundwater, thus achieving the effect of self-balancing.

[0030] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the claims.

Claims

1. A laterally counterweighted self-balancing diaphragm wall enclosure, characterized by, The application relates to a foundation pit supporting structure, which comprises a diaphragm wall, a connecting beam, lateral counterweights, a data storage and transmission device, an intelligent hydraulic device and a control system. The connecting beam is connected to the top of the diaphragm wall, and a plurality of lateral counterweights are arranged at intervals along the outer side of the connecting beam; a plurality of embedded steel bars are arranged at intervals horizontally in each lateral counterweight, and the other ends of the embedded steel bars extend to the connecting beam; the plurality of lateral counterweights and the connecting beam are integrally cast as a whole; the intelligent hydraulic device is arranged at the bottom of the lateral counterweight and is signal-connected with the data storage and transmission device; and the data storage and transmission device and the intelligent hydraulic device are signal-connected with the control system.

2. The laterally counterweighted self-balancing diaphragm wall enclosure of claim 1, wherein: The plurality of lateral counterweights are arranged at intervals along the outer edge of the diaphragm wall, and the interval between two adjacent lateral counterweights is 3m.

3. The laterally counterweighted self-balancing diaphragm wall enclosure of claim 1, wherein: The application further comprises a cushion layer arranged between the soil outside the foundation pit and the lateral counterweight.

4. The laterally counterweighted self-balancing diaphragm wall enclosure of claim 1, wherein: The application further comprises an additional counterweight made of concrete and placed on the top of the lateral counterweight.

5. The laterally counterweighted self-balancing diaphragm wall enclosure of claim 1, wherein: The intelligent hydraulic device comprises a hydraulic pump, a hydraulic cylinder, a sensor and a controller, and the sensor and the controller are signal-connected with the control system.

6. The construction method of a laterally counterweighted self-balancing diaphragm wall enclosure according to any one of claims 1 to 5, wherein, The steps are as follows: S1: after the concrete pouring of the diaphragm wall is completed, a plurality of lateral counterweight grooves are formed by open trenching at intervals along the outer edge of the diaphragm wall; the intelligent hydraulic device and the data storage and transmission device are installed at the bottom of the lateral counterweight grooves; embedded steel bars are arranged in the lateral counterweight grooves, and the other ends of the embedded steel bars extend to the connecting beam to be cast on the top of the diaphragm wall; and the connecting beam and the plurality of lateral counterweights are integrally cast; S2: the intelligent hydraulic device and the data storage and transmission device are signal-connected with the control system; the control system sets a pressure balance threshold value and obtains the pressure value at the bottom of the lateral counterweight in real time; when the monitored pressure value becomes larger and approaches the threshold value, the control system controls the hydraulic cylinder of the intelligent hydraulic device to extend; and when the monitored pressure value becomes smaller, an additional counterweight is placed on the top of the lateral counterweight.

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