A reaction force and locking system for mud-water balance caisson station in soft soil areas

Abstract

The present invention belongs to the technical field of underground engineering construction, and specifically relates to a reaction force and locking system for a mud-water balanced caisson station in a soft soil area, including a reaction force truss, a jack and a locking device; the reaction force truss includes a crossbeam and a column, and the two ends of the crossbeam are respectively fixed to the two columns; the bottoms of the two columns are fixed to the ground, and the opposite sides of the two columns are provided with locking devices for cooperating with the locking piers on the side walls of the caisson section to lock the caisson section. The reaction force and locking system for a mud-water balanced caisson station in a soft soil area provided by the present invention applies a sinking force to the caisson structure and adjusts the caisson posture by arranging a jack under the reaction force truss; by arranging locking devices on both sides of the caisson section, and locking the caisson section by cooperating with the locking piers on the side walls of the caisson section, so as to facilitate the assembly and pouring of the next section of the caisson structure or monitor the current caisson section, thereby improving the construction speed of the caisson and ensuring safety.

Description

Technical Field

[0001] The invention belongs to the technical field of underground engineering construction, and in particular relates to a reaction force and locking system of a mud-water balance caisson station in a soft soil area. Background Art

[0002] In the traditional caisson construction, the soil inside the caisson is excavated while the caisson wall is sinking, and each layer of structural slabs is poured from bottom to top after the caisson wall sinks to the designed elevation. During the sinking process of the caisson wall, if the sinking speed is too fast or too slow, the sinking of the caisson wall is usually controlled by adjusting the friction resistance of the caisson wall sidewall (such as using thixotropic mud, air curtain, etc.) or reducing the resistance under the blade foot.

[0003] Unlike the traditional caisson construction method, the caisson station constructed by the mud-water balance method does not need to excavate the soil inside the caisson during the sinking process because the station floor, blade feet, and side walls are cast first. The soil under the station floor is discharged by the mud-water control system and the station structure is sunk as a whole. However, when the caisson segments of the station structure need to be vertically assembled and cast, or when the current caisson segment encounters a situation and needs to stop sinking, it is difficult to lock the station structure at any time; in addition, during the overall sinking of the station structure, a large water reaction force may be encountered, causing the station structure to sink slowly, or even have an upward trend. Therefore, it is necessary to design a mud-water balance caisson station reaction force and locking system in soft soil areas that can lock the caisson segments at any time. Summary of the invention

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a reaction force and locking system for a mud-water balance caisson station in soft soil areas, which can apply reaction force to and lock the caisson section at any time during the sinking process of the caisson section, thereby realizing the construction of the next caisson section, improving the construction speed of the caisson section and ensuring the safety of the station during the sinking process.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is a reaction and locking system for a mud-water balance caisson station in a soft soil area, comprising a reaction truss and a locking device; the reaction truss comprises a crossbeam and a column, and the two ends of the crossbeam are respectively fixed to the two columns; the bottoms of the two columns are fixed to the ground, and the opposite sides of the two columns are provided with locking devices for cooperating with the locking piers on the side wall of the caisson section to lock the caisson section; a reaction jack is provided between the bottom surface of the crossbeam and the top surface of the caisson section to provide power for the sinking of the caisson section and to adjust the posture of the caisson.

[0006] Furthermore, there are a plurality of reaction jacks, and the plurality of reaction jacks are arranged at intervals along the length direction of the beam.

[0007] Furthermore, there are multiple reaction trusses, which are arranged at intervals along the longitudinal direction of the station caisson section; and the two locking devices on each reaction truss respectively cooperate with the corresponding locking piers on the two side walls of the caisson section.

[0008] As an embodiment, the locking device includes a locking slot, an upper locking jack and a lower locking jack, the locking slot is arranged on the side of the column facing the caisson section, the upper locking jack and the lower locking jack are both arranged in the locking slot, and the locking pier matching the locking device is arranged between the upper locking jack and the lower locking jack.

[0009] Furthermore, the locking device also includes a process auxiliary pad, the process auxiliary pad is arranged in the locking slide groove, and the lower locking jack is arranged on the process auxiliary pad.

[0010] Furthermore, the process auxiliary pad is a steel gasket, a steel plate, a precast concrete slab, a cast-in-place concrete slab or a steel pier.

[0011] As a second embodiment, the locking device includes a locking slot and an electromagnetic steel plate. The locking slot is arranged on the side of the column facing the caisson section, and the end of the locking pier away from the side wall of the caisson section is provided with a locking pier end steel plate. The side wall of the locking slot is provided with an electromagnetic steel plate that matches the locking pier end steel plate.

[0012] As a third embodiment, the locking device includes a winch, a steel strand and a directional pulley; one end of the steel strand is connected to the side wall of the caisson section, and the other end bypasses the directional pulley and is connected to the winch.

[0013] Furthermore, a plurality of reaction jacks are fixed on the crossbeam, and the plurality of reaction jacks are arranged at intervals along the length direction of the crossbeam.

[0014] Furthermore, a reaction frame foundation is provided below the reaction truss, and the column is arranged on the reaction frame foundation.

[0015] Furthermore, the reaction frame foundation is a strip foundation, a pile raft foundation, an independent foundation or a natural foundation.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The slurry-water balance caisson station reaction force and locking system for soft soil areas provided by the present invention is provided with locking devices on both sides of the caisson section, and the caisson section is locked by the locking devices cooperating with the locking piers on the side walls of the caisson section, so that the caisson section can be locked at any time during the sinking process of the caisson section, so as to facilitate the assembly and pouring of the next caisson section or the inspection of the current caisson section, thereby improving the construction speed and efficiency of the caisson section;

[0018] (2) The reaction force and locking system for the mud-water caisson station in soft soil areas provided by the present invention can provide a vertical reaction force for the sinking of the mud-water caisson section through a reaction jack arranged above the caisson section, so as to increase the sinking speed;

[0019] (3) The locking pier that cooperates with the locking device in the reaction force and locking system of the mud-water balance caisson station in soft soil areas provided by the present invention is arranged between the upper locking jack and the lower locking jack of the locking device. During the normal descent of the caisson section, the upper locking jack and the lower locking jack follow each other within the scope of their respective working processes, and there is no need to pressurize the upper locking jack and the lower locking jack; when the caisson section needs to be locked, the lower locking jack is pressurized to provide a supporting reaction force for the caisson section; if the caisson section encounters a large water reaction force during the sinking process, causing the descent speed to be slow or even having an upward trend, the upper locking jack is pressurized to provide downward pressure on the caisson section, thereby increasing the descent speed of the caisson section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic structural diagram of a reaction force and locking system for a mud-water balance caisson station in a soft soil area provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of one of the locking devices of the reaction force and locking system of the mud-water balance caisson station in soft soil area provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of a second locking device of a reaction force and locking system of a mud-water balance caisson station in a soft soil area provided by an embodiment of the present invention;

[0024] Figure 4A schematic diagram of a third locking device of a reaction force and locking system of a mud-water balance caisson station in a soft soil area provided by an embodiment of the present invention;

[0025] In the figure: 1. reaction frame foundation, 2. caisson section, 3. locking pier, 301. locking pier end steel plate, 4. reaction truss, 5. reaction jack, 6. locking device, 601. locking slide, 602. upper locking jack, 603. lower locking jack, 604. process auxiliary pad, 605. electromagnetic steel plate, 606. winch, 607. steel strand, 608. directional pulley. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, 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 other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features; in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0029] like Figure 1-Figure 2As shown, an embodiment of the present invention provides a reaction and locking system for a mud-water balance caisson station in a soft soil area, comprising a reaction truss 4 and a locking device 6; the reaction truss 4 comprises a crossbeam and a column, and the two ends of the crossbeam are respectively fixed to the tops of the two columns; the bottoms of the two columns are fixed to the ground, and the opposite sides of the two columns are provided with a locking device 6 for cooperating with the locking piers 3 on the side walls of the caisson section 2 to lock the caisson section 2; a reaction jack 5 is provided between the bottom surface of the crossbeam and the top surface of the caisson section for providing power for the sinking of the caisson section and adjusting the posture of the caisson. When the station is constructed by the mud-water balance caisson method, it is necessary to spray high-pressure water into the soft soil below the caisson section to form diluted mud water, and then the diluted mud water is gradually discharged through the negative pressure, and the caisson section is gradually sunk to the control elevation. In this process, the reaction jack 5 is used to provide vertical power for the sinking of the caisson section and adjust the sinking posture of the caisson section. The previous caisson section needs to sink a certain distance before the next caisson section is constructed on it. At this time, it is necessary to ensure that the previous caisson section is stationary. In this embodiment, locking devices are applied on both sides of the caisson section along the length direction. Device 6, and locking piers 3 are constructed on the side walls on both sides of the caisson section 2, the locking piers 3 are placed in the locking device 6, and the locking devices 6 on both sides cooperate with the locking piers 3 on both sides of the caisson section 2 to lock it from both sides, so that the caisson section 2 remains stationary in the vertical direction, so that the caisson section 2 can be locked at any time during the sinking process, so as to facilitate the assembly and pouring of the next caisson section or the detection of the current caisson section 2, thereby improving the construction speed and efficiency of the caisson section 2; it is suitable for the construction of underground stations and municipal foundation pit projects in soft soil areas.

[0030] Furthermore, there are multiple reaction jacks 5, and the multiple reaction jacks 5 are arranged at intervals along the length direction of the crossbeam. Before the caisson section 2 sinks, multiple reaction jacks 5 are arranged on the top surface of the caisson section 2. Under normal circumstances, the caisson section slowly sinks to the specified position by its own gravity or under the control of the water flow pressure. However, when the caisson section 2 encounters a large water reaction force, which will cause its sinking speed to be slow or have an upward trend, the reaction jacks 5 apply force to provide vertical reaction force for the sinking of the mud-water balance caisson section 2, accelerate the sinking rate of the caisson station and adjust the sinking posture of the caisson structure; the size of the reaction force applied by the reaction jacks 5 is adjusted according to the data monitored by the entire system, combined with the sinking rate, posture, bottom plate monitoring reaction force, etc. of each caisson section of the station. Figure 3 As shown, three reaction jacks 5 are arranged above the caisson section 2 with two spans, and the three reaction jacks 5 are respectively placed on the two side walls and the middle longitudinal beam of the caisson section 2, so as to adjust the sinking speed from multiple positions to avoid the caisson section 2 from tilting.

[0031] Furthermore, there are multiple reaction trusses 4, and the multiple reaction trusses 4 are arranged at intervals along the longitudinal direction of the station; the two side walls of each caisson section 2 are arranged at intervals along the length direction of the caisson section 2, and the two locking devices 6 on each reaction truss 4 are respectively matched with the two corresponding locking piers 3 on the two side walls of the caisson section 2, and the two sides of the caisson section 2 are locked at the same time to prevent the caisson section 2 from tilting; the adjacent reaction trusses 4 are connected by longitudinal beams along the underground length direction to improve the overall stability of the reaction trusses 4. In this embodiment, the locking piers 3 are arranged longitudinally along the side walls of the caisson section 2, and form a complete cast-in-place structure with the side walls of the caisson section 2. The specific distribution number of the reaction trusses 4 and the specific distribution number of the locking piers 3 are calculated and determined according to the weight of each caisson section 2 and the longitudinal segment length of the station. The locking piers 3 can be a rectangular structure, a trapezoidal structure, a wedge-shaped structure, etc., and any shape of the structure does not affect its use function. The locking pier 3 is arranged at the top of each caisson section 2. Before the locking pier 3 sinks below the ground with the caisson section 2, the locking pier 3 is cut off or chiseled off. During the sinking process of each caisson section, it should be ensured that at least one locking pier 3 on the side wall is in the locking device 6.

[0032] As an implementation method, Figure 2 As shown, the locking device 6 includes a locking slot 601, an upper locking jack 602 and a lower locking jack 603. The locking slot 601 is arranged on the side of the column facing the caisson section 2. The upper locking jack 602 and the lower locking jack 603 are both arranged in the locking slot 601, and the locking pier 3 matched with the locking device 6 is arranged between the upper locking jack 602 and the lower locking jack 603. When the caisson 2 is in the normal descending process, the upper locking jack 602 and the lower locking jack 603 follow within their respective working process ranges, and the upper locking jack 602 and the lower locking jack 603 do not need to be pressurized, and pressurization is performed only when the caisson 2 does not need to sink, that is, when it is not in working state; specifically, when the caisson 2 needs to be locked, the lower locking jack 603 is pressurized to provide a supporting reaction force for the caisson 2; if the caisson 2 encounters a large water reaction force during the sinking process, causing a slow descending speed or even an upward trend, the upper locking jack 602 is pressurized to provide downward pressure on the caisson 2 to increase the descending speed of the caisson 2. Among them, the number of the upper locking jack 602 and the lower locking jack 603 is determined according to the size of the required locking force.

[0033] Furthermore, the locking device 6 further includes a process auxiliary pad 604, which is disposed in the locking chute 601, and the lower locking jack 603 is disposed on the process auxiliary pad 604. The upper locking jack 602 and the lower locking jack 603 normally work within the process range. When the upper locking jack 602 and the lower locking jack 603 exceed their working process, the process auxiliary pad 604 can be added at the bottom of the lower locking jack 603 to fill the gap between the jack and the structure, thereby increasing the length of the jack's working process, such as Figure 2 As shown, the process auxiliary pad 604 can have multiple layers, and the specific number of layers of the process auxiliary pad 604 laid can be selected according to needs; wherein, the process auxiliary pad 604 can be in various forms such as steel gaskets, steel plates, precast concrete slabs, cast-in-place concrete slabs or steel piers, and can be selected according to specific needs.

[0034] As a second implementation method, Figure 3 As shown, the locking device 6 includes a locking chute 601 and an electromagnetic steel plate 605. The locking chute 601 is arranged on the side of the column facing the caisson section 2. The end of the locking pier 3 away from the side wall of the caisson section 2 is provided with a locking pier end steel plate 301. The side wall of the locking chute 601 is provided with an electromagnetic steel plate 605 that matches the locking pier end steel plate 301. During the normal descent of the caisson section 2, the locking pier end steel plate 301 moves from top to bottom in the locking chute 601, and there is no need to energize the electromagnetic steel plate 605; when the caisson section 2 needs to be locked, the electromagnetic steel plate 605 is energized to generate a magnetic field to adsorb and fix the locking pier end steel plate 301 on the electromagnetic steel plate 605, thereby providing support force for the caisson section 2.

[0035] As a third implementation method, Figure 4 As shown, the locking device 6 includes a winch 606, a steel strand 607 and a directional pulley 608; one end of the steel strand 607 is connected to the side wall of the caisson section, and the other end is connected to the winch 606 after passing the directional pulley 608. During the normal descent of the caisson section 2, the steel strand 607 wound thereon is gradually released by the winch 606, so that the caisson section 2 gradually sinks under the action of gravity; when the caisson section 2 needs to be stationary, the winch 606 stops releasing the steel strand 607, and the steel strand 607 provides tension to the caisson section 2, so that the caisson section 2 stops sinking.

[0036] In this embodiment, a reaction frame foundation 1 is arranged below the reaction truss 4, and the columns are arranged on the reaction frame foundation 1 to ensure that the foundation has sufficient bearing capacity to ensure the stability of the caisson section 2 after locking; further, the reaction frame foundation 1 can be a strip foundation, a pile raft foundation, an independent foundation or a natural foundation, and the specific form is determined by the size of the reaction force to determine which type of reaction frame foundation 1 is adopted, wherein the strip foundation, the pile raft foundation, and the independent foundation can all be reinforced concrete structures. In this embodiment, the columns are steel frames or reinforced concrete structures, and form a portal truss with the beams. The size of the reaction truss 4 is determined according to the scale of the station and the size of the reaction force required for sinking.

[0037] The reaction force and locking system in this embodiment is connected to the station automatic control system. The reaction force of each reaction jack in the reaction force and locking system is controlled through various information indicators fed back from the automatic control system, such as sinking speed, sinking pressure, etc., to provide vertical power for the sinking of the caisson section and adjust the sinking posture of the caisson section.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reaction force and locking system for a mud-water balance caisson station in soft soil areas, characterized in that: It comprises a reaction truss and a locking device; the reaction truss comprises a crossbeam and a column, and the two ends of the crossbeam are respectively fixed to the two columns; the bottoms of the two columns are fixed to the ground, and the two columns are provided with locking devices on opposite sides for cooperating with the locking piers on the side wall of the caisson to lock the caisson; a reaction jack is provided between the bottom surface of the crossbeam and the top surface of the caisson for providing power for the sinking of the caisson and adjusting the posture of the caisson; there are multiple reaction jacks, and the multiple reaction jacks are arranged at intervals along the length direction of the crossbeam; The locking device adopts any of the following structures: 1) The locking device comprises a locking chute, an upper locking jack and a lower locking jack, wherein the locking chute is arranged on a side of the column facing the caisson section, the upper locking jack and the lower locking jack are both arranged in the locking chute, and a locking buttress matched with the locking device is arranged between the upper locking jack and the lower locking jack; 2) The locking device includes a locking slot and an electromagnetic steel plate. The locking slot is arranged on the side of the column facing the caisson section. The end of the locking pier away from the side wall of the caisson section is provided with a locking pier end steel plate. The side wall of the locking slot is provided with an electromagnetic steel plate that matches the locking pier end steel plate.

2. A reaction force and locking system for a mud-water balance caisson station in a soft soil area as claimed in claim 1, characterized in that: There are multiple reaction trusses, which are arranged at intervals along the longitudinal direction of the caisson section; and the two locking devices on each reaction truss are respectively matched with corresponding locking piers on the walls on both sides of the caisson section.

3. The reaction force and locking system for mud-water balance caisson station in soft soil area according to claim 1, characterized in that: When the locking device adopts structure 1), the locking device further comprises a process auxiliary pad, the process auxiliary pad is arranged in the locking slide groove, and the lower locking jack is arranged on the process auxiliary pad.

4. A reaction force and locking system for a mud-water balance caisson station in a soft soil area as claimed in claim 3, characterized in that: The process auxiliary pad is a steel plate, a prefabricated concrete plate, a cast-in-place concrete plate or a steel pier.

5. The reaction force and locking system for mud-water balance caisson station in soft soil area according to claim 1, characterized in that: A reaction frame foundation is provided below the reaction truss, and the columns are arranged on the reaction frame foundation.

6. A reaction force and locking system for a mud-water balance caisson station in soft soil areas as claimed in claim 5, characterized in that: The reaction frame foundation is a strip foundation, a pile raft foundation, an independent foundation or a natural foundation.

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