Sinking device and method for vertical shaft wall

Abstract

The invention discloses a sinking device and method for a vertical shaft wall, and the sinking device for the vertical shaft wall comprises a mounting base and a lifting device fixedly arranged on the mounting base. Supporting and sinking driving of the prefabricated well wall are achieved through cooperation of the upper lifting assembly and the lower lifting assembly, when the multiple sinking jacks stretch out and draw back synchronously, the prefabricated well wall can stably and vertically sink in a floating state, in the process that the prefabricated well wall is installed to a shaft, the axial direction of the prefabricated well wall is positioned, and therefore the prefabricated well wall can be installed conveniently. Therefore, axial deviation of the prefabricated well wall during sinking is avoided, the installation vertical precision of the prefabricated well wall is guaranteed, and meanwhile the depth of open caisson method construction is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of municipal engineering, and in particular to a sinking device and method for a vertical shaft wall. Background Art

[0002] In the construction of municipal water and transportation projects, it is necessary to build some vertical shafts. The commonly used vertical shaft excavation method in cities in soft soil areas is designed and constructed according to the deep foundation pit retaining technology, which has high cost and long construction period, and has a great impact on the living environment of the surrounding citizens. This method of open excavation of vertical shafts limits the excavation depth; another method is the caisson method and the vertical well drilling method (such as hydraulic excavation caisson, VSM method, drilling method, etc.). The traditional caisson method is only suitable for relatively open areas around, and the sinking of the well wall is prone to technical problems such as deflection and inadequate sinking; and the drilling method and the VSM method both have the problems of requiring a large construction site, high construction cost, generating a large amount of mud during the construction process, and having a great impact on the surrounding environment.

[0003] When digging a vertical shaft in a narrow area within a city, when the shaft diameter reaches more than 4m and the excavation depth reaches more than 30m, the current conventional and traditional various vertical shaft construction technologies cannot meet the requirements for shaft verticality, cost control, environmental protection and construction site.

[0004] Therefore, the engineering community urgently needs to develop a technology for regulating the vertical floating and sinking of the shaft wall to overcome the defects and shortcomings of the current caisson method and vertical well drilling method, and to achieve the goal of building a vertical shaft in a narrow urban area by caisson. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a sinking device and method for a vertical shaft wall with high construction efficiency and low cost.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions.

[0007] The present application provides a sinking device for a vertical shaft wall, comprising a mounting base and a lifting device fixedly arranged on the mounting base;

[0008] The mounting base includes a construction platform and a drilling frame fixedly arranged on the end surface of the construction platform away from the ground, the lifting device includes a lower lifting assembly and an upper lifting assembly located on the side of the lower lifting assembly away from the ground, the lower lifting assembly and the upper lifting assembly both include a locking tie coaxial with the wellbore, and a plurality of locking pads are fixedly arranged in a circular array about the central axis of the wellbore on the inner annular surface of the locking tie;

[0009] The locking tie is in a non-closed annular shape and a locking cylinder is provided between the two ends. The fixed end and the telescopic end of the locking cylinder are respectively hinged to the two ends of the locking tie, and the locking cylinder can adjust the diameter of the locking tie when it is telescopic.

[0010] The lower lifting assembly further comprises a plurality of sinking jacks arranged in a circular array about the central axis of the wellbore, wherein the fixed ends of the sinking jacks are hinged to the mounting base, and the telescopic ends face away from the ground and are hinged to the locking tie of the lower lifting assembly;

[0011] The upper lifting assembly also includes a support frame fixedly arranged on the drilling frame, and the locking binding piece and the locking pad of the upper lifting assembly are in contact with the end surface of the support frame away from the ground.

[0012] It is further defined that, in the above-mentioned sinking device for the wall of a vertical shaft, at least one group of the upper lifting assembly and the lower lifting assembly is provided on the drilling frame along the axial direction of the wellbore.

[0013] It is further defined that, in the above-mentioned sinking device for a vertical shaft wall, the construction platform comprises a plurality of assembly parts, and the plurality of assembly parts are fixedly connected by fastening bolts.

[0014] It is further defined that in the above-mentioned sinking device for a vertical shaft wall, the construction platform further comprises two groups of fastening cables respectively arranged in a linear array along the first direction and the second direction, and the two groups of fastening cables respectively comprise a plurality of assembly parts penetrating corresponding positions in the extending direction;

[0015] Both ends of the fastening cable extend to the outside of a plurality of assembly parts and are respectively connected with prestressed through-hole jacks, and the prestressed through-hole jacks can adjust the fastening prestress of the fastening cable at the corresponding position;

[0016] The first direction and the second direction are specifically set to be two vertical directions on a horizontal plane.

[0017] It is further defined that, in the above-mentioned sinking device for a vertical shaft wall, in the vertical direction, the distance between the fastening cable and the bottom surface of the assembly part is less than half of the height of the assembly part.

[0018] It is further defined that the above-mentioned sinking device for a vertical shaft wall further includes a counterweight unit arranged on the end surface of the construction platform away from the ground.

[0019] The present application also provides a sinking method for a vertical shaft wall, which is applicable to any of the above-mentioned sinking devices for a vertical shaft wall, comprising:

[0020] A mounting base is built at the wellbore location, and the locking tie is set to be coaxial with the wellbore;

[0021] Install the prefabricated well wall into the wellbore, and during the installation of the prefabricated well wall, lift and limit the prefabricated well wall by means of a lifting device;

[0022] The bottom wall of the shaft is excavated by excavation equipment to increase the depth of the shaft, and the prefabricated shaft wall is driven downward by a lifting device during the construction of the excavation equipment;

[0023] Among them, the lifting and limiting of the prefabricated shaft wall are specifically as follows:

[0024] During the installation of the prefabricated well wall, the upper lifting assembly and / or the lower lifting assembly clamp the prefabricated well wall to apply a lifting force to the prefabricated well wall vertically toward the side away from the ground;

[0025] The specific steps of sinking the prefabricated shaft wall are as follows:

[0026] The upper lifting assembly is in a non-clamping state, the lower lifting assembly clamps the prefabricated well wall and the sinking jack is in an extended state;

[0027] The sinking jack of the lower lifting assembly is retracted to drive the prefabricated shaft wall to sink;

[0028] The upper lifting assembly clamps the prefabricated well wall, the lower lifting assembly releases the clamping state and the sinking jack is extended;

[0029] The upper lifting assembly and the lower lifting assembly cooperate to drive the prefabricated well wall to sink to a predetermined elevation depth in the wellbore.

[0030] It is further defined that the above-mentioned method for sinking a shaft wall further comprises, before constructing the installation base at the shaft position:

[0031] A locking guide wall is cast at the opening of the shaft.

[0032] It is further defined that the above-mentioned method for sinking a shaft wall, wherein the sinking drive of the prefabricated shaft wall further comprises:

[0033] Get the sinking force and sinking resistance information of the prefabricated well wall:

[0034] The telescopic force of the sinking jack is adjusted based on the sinking force and sinking resistance information of the prefabricated well wall.

[0035] It is further defined that the above-mentioned method for sinking a shaft wall, wherein the sinking drive of the prefabricated shaft wall further comprises:

[0036] Injecting drag-reducing fluid into the gap between the wellbore and the prefabricated wellbore wall;

[0037] And / or, increasing the over-excavation amount of the wellbore bottom by the excavation equipment to reduce the sinking resistance of the prefabricated wellbore wall.

[0038] The present invention has at least the following beneficial effects:

[0039] 1. The upper lifting assembly and the lower lifting assembly are used to support and drive the prefabricated well wall. When multiple sinking jacks are extended and retracted synchronously, the prefabricated well wall can be steadily and vertically sunk in a floating state. During the installation of the prefabricated well wall to the wellbore, the axial direction of the prefabricated well wall is positioned to avoid axial deviation of the prefabricated well wall during sinking, which not only ensures the vertical accuracy of the installation of the prefabricated well wall, but also increases the depth of the caisson construction.

[0040] 2. When building a shaft in a narrow area, due to site limitations, large equipment and machinery cannot be transported and hoisted to the construction site. By setting the construction platform to a spliced ​​type, it can cope with the narrow construction area, which is conducive to reducing its volume in the non-assembled state and facilitating transportation;

[0041] 3. When installing the prefabricated shaft wall in the shaft, the construction platform will produce downward deflection in the area adjacent to the shaft under the action of the construction load. At this time, the prestressed through-hole jack can apply tightening prestress to the fastening cable, so that the combined construction platform produces an upward arch deformation to offset the downward deflection, thereby improving the overall strength and rigidity of the construction platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 This is a schematic structural diagram of a sinking device for a vertical shaft wall in an embodiment of the present application in a clamping and positioning state of a "prefabricated shaft wall 110";

[0043] Figure 2 This is a schematic structural diagram of a sinking device for a vertical shaft wall in an embodiment of the present application in a "prefabricated shaft wall 110" sinking state;

[0044] Figure 3 This is a schematic structural diagram of a sinking device for a vertical shaft wall in an embodiment of the present application in a lifting state of a "prefabricated shaft wall 110";

[0045] Figure 4 This is an enlarged schematic diagram of the structure of the "fastening bolt 212" part of the sinking device for the shaft wall of the vertical shaft in the embodiment of the present application;

[0046] Figure 5 This is an enlarged schematic diagram of the structure of the "drag reducing fluid 620" part of the sinking device for the vertical shaft wall in the embodiment of the present application;

[0047] Figure 6 This is a structural schematic diagram of a "construction platform 210" in a sinking device for a vertical shaft wall in an embodiment of the present application;

[0048] Figure 7 This is a structural schematic diagram of a "drilling frame 200" in a sinking device for a vertical shaft wall in an embodiment of the present application;

[0049] Figure 8 This is a schematic structural diagram of the "locking tie 520 and locking pad 540" parts of the sinking device for the vertical shaft wall in the embodiment of the present application.

[0050] Reference numerals

[0051] Wellbore-100, prefabricated well wall-110, locking guide wall-130, drilling frame-200, construction platform-210, assembly parts-211, fastening bolts-212, fastening ropes-213, prestressed through-core jacks-214, counterweight units-300, processing units-400, sinking jacks-510, locking bindings-520, support frames-530, locking pads-540, gap adjustment-550, locking cylinders-560, balancing mud-610, drag reducing fluid-620, and delivery pipes-700. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0053] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0054] The sinking device and method for the vertical shaft wall provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0055] Example 1

[0056] like Figures 1 to 8 As shown, an embodiment of the present application provides a sinking device for a vertical shaft wall, including a mounting base and a lifting device fixedly disposed on the mounting base and used for clamping a prefabricated shaft wall 110 .

[0057] The installation base includes a construction platform 210 and a drilling frame 200 fixedly arranged on an end surface of the construction platform 210 away from the ground.

[0058] The lifting device includes a lower lifting component and an upper lifting component located on the side of the lower lifting component away from the ground. The lower lifting component and the upper lifting component both include a locking tie 520 coaxial with the wellbore 100. A plurality of locking pads 540 are fixedly arranged in a circular array about the central axis of the wellbore 100 on the inner annular surface of the locking tie 520.

[0059] The locking tie 520 is in the shape of a non-closed circular ring and a locking cylinder 560 is provided between the two ends. The fixed end and the telescopic end of the locking cylinder 560 are respectively hinged to the two ends of the locking tie 520, and the locking cylinder 560 can adjust the diameter of the locking tie 520 when it is telescoped.

[0060] Among them, the lower lifting assembly also includes a sinking jack 510, and a plurality of sinking jacks 510 are arranged in a circular array about the central axis of the wellbore 100. The fixed end of the sinking jack 510 is hinged to the mounting base, and the telescopic end faces the side away from the ground and is hinged to the locking tie 520 of the lower lifting assembly. The upper lifting assembly also includes a support frame 530 fixedly set on the drilling frame 200, and the locking tie 520 and the locking pad 540 of the upper lifting assembly are in contact with the end face of the support frame 530 away from the ground.

[0061] In the embodiment of the present application, the above-mentioned sinking device for the shaft wall of a vertical shaft is adopted, and the upper lifting component and the lower lifting component cooperate to realize the support and sinking drive of the prefabricated shaft wall 110. When multiple sinking jacks 510 are synchronously extended and retracted, the prefabricated shaft wall 110 can be steadily and vertically sunk in a floating state. In the process of installing the prefabricated shaft wall 110 to the shaft 100, the axial direction of the prefabricated shaft wall 110 is positioned to avoid axial deviation of the prefabricated shaft wall 110 during sinking, which not only ensures the vertical installation accuracy of the prefabricated shaft wall 110, but also improves the depth of the caisson construction.

[0062] In a preferred embodiment, at least one set of upper lifting assemblies and lower lifting assemblies is provided on the drilling frame 200 along the axial direction of the wellbore 100 .

[0063] It can be understood that the number of upper lifting components and lower lifting components is configured based on the weight requirement of the prefabricated shaft wall 110. As long as it can meet the lifting and sinking drive of the prefabricated shaft wall 110, it will not be elaborated here.

[0064] In a preferred embodiment, Figure 8 As shown, an adjustment gap 550 is provided between two adjacent locking pads 540 .

[0065] It can be understood that when the diameter of the locking tie 520 is adjusted by the locking cylinder 560, the locking pad 540 will shrink toward the side close to the central axis of the wellbore 100 as the locking tie 520 deforms. At this time, the adjustment gap 550 can provide shrinkage space for multiple locking pads 540 to avoid position interference between the multiple locking pads 540.

[0066] In addition, the contraction or expansion of the locking pad 540 can be applied to prefabricated well walls 110 of different diameters and thicknesses, thereby expanding the application range of the lifting device.

[0067] In a preferred embodiment, Figure 8 As shown, the locking tie 520 includes at least three locking arms that are arc-shaped and hinged in sequence, one of which is configured as a fixed arm, and the remaining locking arms are configured as movable arms.

[0068] Among them, the locking tie 520, which is composed of a plurality of locking arms hinged in sequence, has its head and tail ends hinged to the fixed end and telescopic end of the locking cylinder 560 respectively.

[0069] In a preferred embodiment, Figures 1 to 3 , Figure 6 As shown, the construction platform 210 includes a plurality of assembly parts 211 , and the plurality of assembly parts 211 are fixedly connected by fastening bolts 212 .

[0070] In a preferred embodiment, Figures 1 to 3 , Figure 6 As shown, the assembly part 211 is provided with a male connector end and a female connector end, and two adjacent assembly parts 211 are plugged in through the male connector and the female connector, and are fixedly connected by a fastening bolt 212 .

[0071] In an embodiment of the present application, the above-mentioned sinking device for the shaft wall is used to build a shaft in a narrow area. Due to site limitations, large equipment and machinery cannot be transported and hoisted to the construction site. By setting the construction platform 210 to a splicing type, it is able to cope with narrow construction areas, which is beneficial to reducing its volume in a non-assembled state and facilitating transportation.

[0072] Of course, the configuration of the construction platform 210 is not limited to the above-mentioned one, and it can also be configured as an integral structure, which will increase the construction and transportation costs. As long as the overall support of the device can be achieved, it will not be elaborated here.

[0073] In a preferred embodiment, the length of the assembly 211 is set to be no greater than 16 m, the width and height are set to be no greater than 3 m, and the weight is set to be no greater than 10 tons.

[0074] In a preferred embodiment, Figures 1 to 3 , Figure 6 As shown, the construction platform 210 further includes two groups of fastening cables 213 which are arranged in a linear array along the first direction and the second direction respectively.

[0075] One group of fastening cables 213 includes a plurality of fastening cables that penetrate the corresponding assembly parts 211 in the first direction, and the other group of fastening cables 213 includes a plurality of fastening cables that penetrate the corresponding assembly parts 211 in the second direction.

[0076] Both ends of the fastening cable 213 extend to the outside of the plurality of assembly parts 211 and are respectively connected to prestressed through-core jacks 214 . The prestressed through-core jacks 214 can adjust the fastening prestress of the fastening cable 213 at the corresponding position.

[0077] The first direction and the second direction are specifically set to be two vertical directions on a horizontal plane.

[0078] In a preferred embodiment, in the vertical direction, the distance between the fastening cable 213 and the bottom surface of the assembly part 211 is less than half of the height of the assembly part 211 .

[0079] In an embodiment of the present application, the above-mentioned sinking device for a vertical shaft wall is adopted. When the prefabricated shaft wall 110 is installed in the shaft 100, the construction platform 210 will produce a downward deflection in the area adjacent to the shaft 100 under the action of the construction load. At this time, the prestressed through-core jack 214 can apply a tightening prestress to the fastening cable 213, so that the combined construction platform 210 produces an upward arch deformation to offset the downward deflection, thereby improving the overall strength and rigidity of the construction platform 210.

[0080] In a preferred embodiment, in the vertical direction, the distance between the fastening cable 213 and the bottom surface of the assembly part 211 is set to be one quarter of the height of the assembly part 211 .

[0081] It is understandable that the setting orientation of the fastening cable 213 is not limited to the above one, as long as the collapse deflection of the construction platform 210 can be overcome by adjusting the fastening prestress of the fastening cable 213, which will not be elaborated here.

[0082] In a preferred embodiment, Figures 1 to 3 As shown, it also includes a counterweight unit 300 arranged on the end surface of the construction platform 210 away from the ground.

[0083] It is understandable that when the installation resistance of the prefabricated shaft wall 110 to be lifted is relatively large, the support reaction force of the construction platform 210 can be increased by adding the counterweight unit 300, thereby ensuring the stability of the installation base during the construction process.

[0084] In a preferred embodiment, Figures 1 to 3As shown, it also includes a processing unit 400 fixedly arranged on the mounting base.

[0085] The processing unit 400 is used for tempering the balancing mud 610 in the wellbore 100 .

[0086] It can be understood that when the balanced mud 610 fills the wellbore 100, it can support the excavation surface of the wellbore 100, thereby preventing the excavation surface from collapsing.

[0087] In a preferred embodiment, Figure 5 As shown, it also includes a delivery pipe 700 arranged between the outer circular surface of the prefabricated well wall 110 and the excavation surface of the wellbore 100.

[0088] The delivery pipe 700 is used to discharge the drag reducing fluid 620 between the wellbore 100 and the prefabricated well wall 110 .

[0089] Example 2

[0090] The embodiment of the present application provides a sinking method for a vertical shaft wall, which is applicable to the sinking device for a vertical shaft wall in the above-mentioned embodiment 1, comprising:

[0091] Step S1, constructing an installation base at the location of the wellbore 100, and setting the locking tie 520 to be coaxial with the wellbore 100;

[0092] Step S2, installing the prefabricated well wall 110 into the wellbore 100, and performing lifting and limiting of the prefabricated well wall 110 by a lifting device during the installation of the prefabricated well wall 110;

[0093] Step S3, excavating the bottom surface of the shaft 100 by excavating equipment to increase the depth of the shaft 100. During the construction of the excavating equipment, the prefabricated shaft wall 110 is driven downward by a lifting device.

[0094] Among them, in step S2, the lifting and limiting of the prefabricated shaft wall 110 is specifically performed as follows:

[0095] During the installation of the prefabricated well wall 110, the locking cylinder 560 of the upper lifting assembly and / or the lower lifting assembly drives the locking tie 520 and the locking pad 540 to tighten, and the locking pad 540 clamps the prefabricated well wall 110 to apply a lifting force to the prefabricated well wall 110 vertically toward the side away from the ground;

[0096] like Figure 3 As shown, when the locking cylinder 560 of the upper lifting assembly drives the locking tie 520 and the locking pad 540 to tighten, the prefabricated well wall 110 is held tightly from the upper part of the wellhead, and the weight of the prefabricated well wall 110 is supported by the well drilling frame 200 and distributed to the construction platform 210;

[0097] like Figure 1 As shown, when the locking cylinder 560 of the lower lifting assembly drives the locking tie 520 and the locking pad 540 to tighten, the prefabricated well wall 110 is held tightly from the bottom of the wellhead, and the weight of the prefabricated well wall 110 is also supported by the drilling frame 200 and distributed to the construction platform 210;

[0098] In step S3, the prefabricated shaft wall 110 is driven downward by:

[0099] like Figure 1 As shown, the locking pad 540 of the upper lifting assembly is in a non-clamping state, and the sinking jack 510 of the lower lifting assembly is in an extended state and clamps the prefabricated well wall 110 through the locking pad 540. At this time, the prefabricated well wall 110 is held and lifted by the lower lifting assembly;

[0100] like Figure 1 As shown, the sinking jack 510 of the lower lifting assembly is retracted to drive the prefabricated well wall 110 to sink;

[0101] like Figure 3 As shown, the upper lifting assembly is arranged on the support frame 530 of the drilling frame 200, and the prefabricated well wall 110 is clamped by the locking pad 540, and the locking pad 540 of the lower lifting assembly is released from the clamping state and the sinking jack 510 is extended, and at this time, the prefabricated well wall 110 is held and lifted by the upper lifting assembly;

[0102] The above steps are repeated to drive the prefabricated well wall 110 to sink in the wellbore 100 through the cooperation of the upper lifting assembly and the lower lifting assembly until a predetermined elevation depth is reached.

[0103] It is understandable that when the sinking jack 510 of the lower lifting assembly retracts to drive the prefabricated well wall 110 to sink, the vertical force applied by the lower lifting assembly to the prefabricated well wall 110 is not less than the sinking resistance of the prefabricated well wall 110 .

[0104] It should be noted that, although the wellbore 100 is filled with balancing mud 610 to resist the external water and soil pressure, when the buoyancy generated by the balancing mud 610 on the prefabricated well wall 110 and the frictional resistance generated by the wellbore 100 hole wall on the prefabricated well wall 110 are still less than the gravity of the prefabricated well wall 110, the prefabricated well wall 110 will automatically sink into the excavated wellbore 100 under the action of its own gravity. At this time, the prefabricated well wall 110 needs to be lifted and fixed at the wellhead so that the prefabricated well wall 110 can be lifted and fixed in the wellbore 100. 00 and facilitate the excavation equipment to continue excavating at the bottom of the shaft 100, providing space for the further sinking of the prefabricated shaft wall 110 and reducing resistance. If the prefabricated shaft wall 110 cannot be lifted and fixed, the autonomous sinking of the prefabricated shaft wall 110 will lead to a deflection that is difficult to correct, thereby causing the prefabricated shaft wall 110 to be unable to further sink to the designed elevation. This is also an important reason why the current caisson technology can only be used to excavate vertical shafts with a depth of about 20m.

[0105] In a preferred embodiment, in step S1, it also includes:

[0106] like Figures 1 to 3 , Figure 5 As shown, a locking guide wall 130 is cast at the opening of the shaft 100.

[0107] It can be understood that the installation base is laid directly on the soft soil foundation. For extremely weak foundations, pre-reinforcement should be carried out. At the same time, in order to facilitate the vertical sinking of the prefabricated well wall 110 into the wellbore 100, the locking guide wall 130 can ensure the stability of the soil on the wellhead excavation surface, and can also serve as a supporting base for the installation base to improve the bearing capacity of the foundation at the wellhead. At the same time, the installation base adopts a split assembly design, which is easy to dismantle, recycle and reuse, achieving the goal of green construction.

[0108] In a preferred embodiment, in step S2 , the lifting force applied by the lifting device to the prefabricated shaft wall 110 is set to 30% of the weight of the prefabricated shaft wall 110 .

[0109] It can be understood that during the sinking process, the prefabricated well wall 110 is affected by the buoyancy of the balancing mud 610 and the frictional resistance of the wellbore 100 hole wall, which can offset a part of the gravity of the prefabricated well wall 110 itself. The lifting force applied by the lifting device to the prefabricated well wall 110 is mainly used to overcome the remaining force after deducting the buoyancy of the balancing mud 610 and the frictional resistance of the wellbore 100 hole wall from the prefabricated well wall 110's own gravity, thereby allowing the prefabricated well wall 110 to sink in a suspended state.

[0110] In a preferred embodiment, in step S3, it also includes:

[0111] Obtaining the sinking force and sinking resistance information of the prefabricated well wall 110;

[0112] Adjust the telescopic force of the sinking jack 510 based on the sinking force and sinking resistance information of the prefabricated well wall 110;

[0113] Among them, when the sinking force of the prefabricated well wall 110 is greater than the sinking resistance, the sinking speed and verticality of the prefabricated well wall 110 are controlled by the sinking jack 510; when the sinking force of the prefabricated well wall 110 is less than the sinking resistance, the sinking resistance is overcome by the sinking jack 510 to realize the sinking drive of the prefabricated well wall 110.

[0114] It can be understood that the form of obtaining the sinking force and sinking resistance information can be, but is not limited to, setting a gravity monitoring device on the prefabricated well wall 110.

[0115] In a preferred embodiment, in step S3, it also includes:

[0116] A drag reducing fluid 620 is injected into the gap between the wellbore 100 and the prefabricated wellbore wall 110 .

[0117] It can be understood that when the resistance to the sinking of the prefabricated well wall 110 is large, the force relying on the sinking jack 510 still cannot push the prefabricated well wall 110 to sink into the wellbore 100. At this time, resistance reduction measures need to be taken. By injecting a drag reducing fluid 620 into the gap between the wellbore 100 and the prefabricated well wall 110, the sinking resistance of the prefabricated well wall 110 can be reduced. The injection of the drag reducing fluid 620 is achieved through a delivery pipe 700 buried on the outside of the prefabricated well wall 110.

[0118] Among them, the delivery pipe 700 is buried on the outside of the prefabricated well wall 110, and more than two are arranged along the circumference of the prefabricated well wall 110, and the number of the delivery pipes increases with the increase of the diameter of the wellbore 100.

[0119] In a preferred embodiment, in step S3, it also includes:

[0120] The over-excavation amount of the excavation equipment on the bottom of the shaft 100 is increased to reduce the sinking resistance of the prefabricated shaft wall 110 .

[0121] It can be understood that in order to control the verticality of the sinking of the prefabricated well wall 110, it is necessary to make the prefabricated well wall 110 in a suspended state in the wellbore 100, that is, the sinking force is greater than or equal to the sinking resistance, and the force borne by the sinking jack 510 is part of the self-weight of the prefabricated well wall 110. When the force of the sinking jack 510 still cannot push the prefabricated well wall 110 to sink into the wellbore 100, it is necessary to control the over-excavation at the bottom of the wellbore 100 (that is, increase the diameter of the bottom of the wellbore 100), so as to increase the gap between the wellbore 100 and the prefabricated well wall 110 and reduce the friction resistance between the prefabricated well wall 110 and the inner wall of the wellbore 100.

[0122] In a preferred embodiment, the prefabricated shaft wall 110 can be, but is not limited to, configured as a steel shaft wall, a reinforced concrete shaft wall, an assembled prefabricated shaft wall, or a reinforced concrete shaft wall cast on site.

[0123] In a preferred embodiment, the planar shape of the wellbore 100 can be set to be circular or non-circular.

[0124] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0125] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A sinking device for a vertical shaft wall, characterized in that: It includes a mounting base and a lifting device fixedly arranged on the mounting base; The mounting base includes a construction platform and a drilling frame fixedly arranged on the end surface of the construction platform away from the ground, the lifting device includes a lower lifting assembly and an upper lifting assembly located on the side of the lower lifting assembly away from the ground, the lower lifting assembly and the upper lifting assembly both include a locking tie coaxial with the wellbore, and a plurality of locking pads are fixedly arranged in a circular array about the central axis of the wellbore on the inner annular surface of the locking tie; The locking tie is in a non-closed annular shape and a locking cylinder is provided between the two ends. The fixed end and the telescopic end of the locking cylinder are respectively hinged to the two ends of the locking tie, and the locking cylinder can adjust the diameter of the locking tie when it is telescopic. The lower lifting assembly further comprises a plurality of sinking jacks arranged in a circular array about the central axis of the wellbore, wherein the fixed ends of the sinking jacks are hinged to the mounting base, and the telescopic ends face away from the ground and are hinged to the locking tie of the lower lifting assembly; The upper lifting assembly also includes a support frame fixedly arranged on the drilling frame, and the locking binding piece and the locking pad of the upper lifting assembly are in contact with the upper end surface of the support frame.

2. A sinking device for a vertical shaft wall according to claim 1, characterized in that: At least one set of the upper lifting assembly and the lower lifting assembly is arranged on the well drilling frame along the axial direction of the wellbore.

3. A sinking device for a vertical shaft wall according to claim 1, characterized in that: The construction platform comprises a plurality of assembly parts, and the plurality of assembly parts are fixedly connected by fastening bolts.

4. A sinking device for a vertical shaft wall according to claim 3, characterized in that: The construction platform also includes two groups of fastening cables arranged in a linear array along the first direction and the second direction respectively, and the two groups of fastening cables respectively include a plurality of assembly parts penetrating corresponding positions in the extension direction; Both ends of the fastening cable extend to the outside of a plurality of assembly parts and are respectively connected with prestressed through-hole jacks, and the prestressed through-hole jacks can adjust the fastening prestress of the fastening cable at the corresponding position; The first direction and the second direction are specifically set to be two vertical directions on a horizontal plane.

5. A sinking device for a vertical shaft wall according to claim 3 or 4, characterized in that: In the vertical direction, the distance between the fastening cable and the bottom surface of the assembly part is less than half of the height of the assembly part.

6. A sinking device for a vertical shaft wall according to claim 1, characterized in that: It also includes a counterweight unit arranged on the end surface of the construction platform away from the ground.

7. A method for sinking a shaft wall, characterized in that: The sinking device for a vertical shaft wall according to any one of claims 1 to 6 above comprises: A mounting base is built at the wellbore location, and the locking tie is set to be coaxial with the wellbore; Install the prefabricated well wall into the wellbore, and during the installation of the prefabricated well wall, lift and limit the prefabricated well wall by means of a lifting device; The bottom wall of the shaft is excavated by excavation equipment to increase the depth of the shaft, and the prefabricated shaft wall is driven downward by a lifting device during the construction of the excavation equipment; Among them, the lifting and limiting of the prefabricated shaft wall are specifically as follows: During the installation of the prefabricated well wall, the upper lifting assembly and / or the lower lifting assembly clamp the prefabricated well wall to apply a lifting force to the prefabricated well wall vertically toward the side away from the ground; The specific steps of sinking the prefabricated shaft wall are as follows: The upper lifting assembly is in a non-clamping state, the lower lifting assembly clamps the prefabricated well wall and the sinking jack is in an extended state; The sinking jack of the lower lifting assembly is retracted to drive the prefabricated shaft wall to sink; The upper lifting assembly clamps the prefabricated well wall, the lower lifting assembly releases the clamping state and the sinking jack is extended; The upper lifting assembly and the lower lifting assembly cooperate to drive the prefabricated well wall to sink to a predetermined elevation depth in the wellbore.

8. A method for sinking a vertical shaft wall according to claim 7, characterized in that: Before constructing the installation base at the wellbore location, it also includes: A locking guide wall is cast at the opening of the shaft.

9. A sinking method for a vertical shaft wall according to claim 7, characterized in that: The sinking drive of the prefabricated shaft wall also includes: Get the sinking force and sinking resistance information of the prefabricated well wall: The telescopic force of the sinking jack is adjusted based on the sinking force and sinking resistance information of the prefabricated well wall.

10. A sinking method for a vertical shaft wall according to claim 7, characterized in that: The sinking drive of the prefabricated shaft wall also includes: Injecting drag-reducing fluid into the gap between the wellbore and the prefabricated wellbore wall; And / or, increasing the over-excavation amount of the wellbore bottom by the excavation equipment to reduce the sinking resistance of the prefabricated wellbore wall.

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