Anti-floating sinking well structure and construction method

Abstract

The invention relates to the technical field of open caissons, and provides an anti-floating and anti-sinking well structure and a construction method.The anti-floating and anti-sinking well structure comprises an open caisson and a bottom sealing layer and further comprises anchor holes, the anchor holes are formed in the axis direction of the open caisson, and the anchor holes penetrate through the well wall of the open caisson and the bottom sealing layer; the anchoring body comprises a grouting section and a rotary spraying section; the grouting section is filled in the anchor hole, and the grouting section is of a grouting forming structure; the jet grouting section is connected with the grouting section and located below the bottom sealing layer, the jet grouting section is of a high-pressure jet grouting forming structure, and the size of the jet grouting section in the radial direction of the anchor hole is larger than the diameter of the anchor hole; one end of the anchor cable is connected with the top end of the open caisson in an anchoring mode through an anchoring structure, and the other end of the anchor cable penetrates through the mud jacking section and extends into the rotary spraying section. The technical problems that when an existing open caisson is constructed, due to the fact that the dead weight of the open caisson is light, the anti-floating stability of the open caisson is poor, floating and instability are prone to occurring during construction, and consequently quality and safety accidents are caused can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of caissons, and in particular to an anti-floating caisson structure and a construction method. Background Art

[0002] Caisson is a structure commonly used in the construction of vertical shafts in underground spaces. The construction method of caisson generally includes: constructing a circular or square tube-shaped caisson with an inclined trapezoidal blade at the bottom of the caisson wall; excavating the soil in the shaft, and under the action of the deadweight of the caisson structure, the blade cuts into the soil and sinks the caisson to a specified depth; then fixing the caisson and sealing the bottom with underwater plain concrete; after the strength of the sealing layer meets the requirements, draining the water in the shaft of the caisson, and then constructing the structural bottom plate and ancillary structures in the shaft.

[0003] When constructing deep caissons in some areas with shallow groundwater levels, the anti-floating stability of the entire caisson structure must be considered; however, after draining the water from the wellbore, the sealing layer and the caisson structure bottom plate have not yet been effectively connected, so the deadweight of the sealing layer cannot be used as an anti-floating force. In addition, the structural bottom plate and the auxiliary structures in the well have not been constructed. At this time, the deadweight of the caisson is the lightest, and it is most likely to become unstable due to floating, thus leading to quality and safety accidents. The common solution now is to increase the wall thickness of the caisson to increase the deadweight, which will undoubtedly greatly increase the project cost and construction time. Therefore, it is urgent to develop a new type of caisson anti-floating structure and corresponding construction method. Summary of the invention

[0004] The purpose of the present invention is to overcome the technical problem that during the construction of the existing caisson, due to its light weight, its anti-floating stability is weak, and it is easy to become unstable during floating during construction, thus causing quality and safety accidents, and to provide an anti-floating caisson structure and construction method.

[0005] In a first aspect, the present invention provides an anti-floating caisson structure, comprising a caisson and a sealing layer, and further comprising:

[0006] Anchor holes are arranged along the axis of the caisson and penetrate the wall and the bottom sealing layer of the caisson;

[0007] Anchor body, the anchor body comprises a grouting section and a rotary spraying section; the grouting section is filled in the anchor hole, and the grouting section is a grouting molding structure; the rotary spraying section is connected to the grouting section and is located below the sealing bottom layer, and the rotary spraying section is a high-pressure rotary spraying molding structure, and the size of the rotary spraying section along the radial direction of the anchor hole is greater than the diameter of the anchor hole;

[0008] Anchor cable, one end of the anchor cable is anchored and connected to the top of the caisson through the anchoring structure, and the other end of the anchor cable passes through the grouting section and extends into the interior of the rotary spraying section.

[0009] In this scheme, anchor holes are set in the caisson and the sealing layer, and the anchor holes penetrate the well wall and the sealing layer of the caisson. During construction, the anchor cable and the rotary jet head of the rotary jet drilling rig can be lowered to the bottom of the sealing layer through the anchor hole, and the rotary jet section is constructed by rotary jetting and the grouting section is constructed by grouting, so as to form an anchor body that penetrates the caisson and the sealing layer and contains the anchor cable, thereby connecting the caisson and the sealing layer together; the rotary jet section is located below the sealing layer, and a radial size greater than the diameter of the anchor hole is obtained by a molding method of high-pressure rotary jetting, which can form an upper anchor body The geometric shape of small at the bottom and large at the bottom ensures the pull-out resistance of the anchor body, thereby ensuring the reliable connection between the caisson and the sealing layer; on the other hand, it can also increase the friction resistance between the anchor body and the surrounding soil; therefore, this solution can make full use of the deadweight of the sealing layer, the friction resistance between the sealing layer and the surrounding soil, the deadweight of the anchor body, and the friction resistance between the anchor body and the surrounding soil to increase the anti-floating force of the caisson, thereby greatly improving the safety and construction quality of subsequent construction; and compared with the existing technology, there is no need to increase the wall thickness of the caisson, which can save the engineering cost and construction period of the caisson.

[0010] Preferably, pre-buried pipes are further provided in the wall of the caisson, the number and positions of the pre-buried pipes match the number and positions of the anchor holes, and the inner diameter of the pre-buried pipes is greater than or equal to the diameter of the anchor holes.

[0011] Since the wall of a caisson is generally a reinforced concrete structure, drilling holes in the wall of the caisson after the construction of the caisson is completed is very difficult. Therefore, this scheme arranges embedded pipes in the wall of the caisson, which can be directly used as anchor holes in the wall, thereby eliminating the need to drill holes in the wall and reducing the amount of drilling work for the anchor holes. At the same time, the embedded pipes can also be used to guide the lowering action of the drill bit, thereby improving the drilling position positioning accuracy of the anchor hole in the sealing layer and ensuring the verticality of the drill hole.

[0012] Preferably, one end of the embedded pipe close to the sealing layer penetrates into the sealing layer.

[0013] In this scheme, when drilling the anchor hole in the sealing layer, the part of the embedded pipe that penetrates into the sealing layer can be used as a guide tube for the drill bit, thereby ensuring a high coaxiality between the drill hole in the sealing layer and the embedded pipe, and further ensuring that the final anchor hole has a high geometric tolerance, avoiding negative effects on the forces on the anchor body and the anchor cable due to excessive deviation in the geometric tolerance of the anchor hole.

[0014] Preferably, the embedded pipe is divided into at least two sections along its length direction.

[0015] This solution divides the embedded pipe into multiple segments with smaller size and weight, which can reduce the difficulty of producing and manufacturing the embedded pipe, and is particularly suitable for segmented caisson structures.

[0016] Preferably, a guide tube is further provided in the anchor hole, and the inner diameter of the guide tube is larger than the diameter of the jet grouting head of the jet grouting drill.

[0017] Since the diameter of the drill bit used for drilling anchor holes is generally larger than the diameter of the rotary sprinkler head of the rotary sprinkler drill, if the anchor hole is used directly to guide the rotary sprinkler head, the rotary sprinkler head will easily shake in the anchor hole and collide with other structures, thereby causing the movement of the rotary sprinkler head to be obstructed or even damaged. Therefore, this scheme adds a guide tube in the anchor hole specifically for guiding the rotary sprinkler head, which can help the rotary sprinkler head move up and down along the anchor hole more smoothly and avoid collision between the rotary sprinkler head and other structures.

[0018] Preferably, the number of anchor cables in each anchor hole is at least two.

[0019] This solution can improve the bearing capacity, stability and safety factor of the anchoring system composed of the anchor body and the anchor cable, and prevent the anchoring system from being weakened or even failing due to the breakage of a single anchor cable.

[0020] Preferably, a centering bracket is also provided in the anchor hole, and the side wall of the centering bracket is clearance-matched with the side wall of the anchor hole. Limiting holes are provided on the centering bracket, and the number of the limiting holes matches the number of anchor cables, and each anchor cable passes through each limiting hole respectively.

[0021] This solution can maintain the relative positions of the anchor cables and between the anchor cables and the anchor holes through the centering bracket. On the one hand, it can prevent the anchor cables from shaking in the anchor holes, causing collisions between the anchor cables and between the anchor cables and the anchor holes, thereby causing damage to the anchor cables and the anchor holes; on the other hand, it can also make the anchor cables distributed in a centrally symmetrical shape relative to the anchor holes, thereby ensuring that the force on the anchor body is uniform everywhere, thereby ensuring the service life of the anchor body; at the same time, the centering bracket can also play the role of an anchor plate, which can strengthen the anchoring effect between the anchor cables and the anchor body and prevent the anchor cables and the anchor body from separating from each other.

[0022] Preferably, the anchor cable comprises a prestressed anchor cable.

[0023] This solution can apply prestress to the anchor body, so that the caisson is anchored and fixed from the beginning, instead of being subjected to stress after the anchor body is displaced upward by buoyancy. At the same time, the tensile stress in the anchor body is also eliminated, and the crack resistance of the anchor body is improved.

[0024] Preferably, the anchoring structure is also wrapped with an anchor sealing structure.

[0025] This solution can prevent the anchoring structure from being corroded by the external environment, thereby ensuring the service life and reliability of the anchoring structure.

[0026] In a second aspect, the present invention provides a construction method for an anti-floating and sinking well structure, which is applicable to the anti-floating and sinking well structure of the present invention, and comprises the following steps:

[0027] S1. Construct the caisson, sink the caisson to the designed elevation, and fix the caisson; construct the sealing layer below the caisson;

[0028] S2, construct anchor holes and put anchor cables into the anchor holes;

[0029] S3, lowering the jet head of the jet grouting drill along the anchor hole to below the bottom sealing layer; lifting the jet head, during which the high-pressure jet grouting is performed in the jet grouting section and the grouting section is performed in the grouting section until the construction of the anchor body is completed;

[0030] S4. Connect the anchor cable to the caisson anchor.

[0031] In this scheme, anchor holes are constructed in the caisson and the sealing layer, and anchor cables are set in the anchor holes. Subsequently, a rotary jet section with a radial dimension exceeding the diameter of the anchor hole is constructed below the sealing layer by using the rotary jet forming method, and the grouting section is filled in the anchor hole by using the grouting forming method, and finally an anchor body containing anchor cables is formed to connect the caisson and the sealing layer to each other, thereby making full use of the deadweight of the sealing layer, the frictional resistance between the sealing layer and the surrounding soil, the deadweight of the anchor body, and the frictional resistance between the anchor body and the surrounding soil to increase the anti-floating force of the caisson, thereby greatly improving the safety and construction quality of subsequent construction and avoiding the situation where the caisson floats and becomes unstable.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] 1. The present invention provides an anti-floating caisson structure, which connects the caisson and the sealing layer together through an anchor body that penetrates the caisson and the sealing layer and contains anchor cables. The structure can fully utilize the deadweight of the sealing layer, the frictional resistance between the sealing layer and the surrounding soil, the deadweight of the anchor body, and the frictional resistance between the anchor body and the surrounding soil to increase the anti-floating force of the caisson, thereby greatly improving the safety and construction quality of subsequent construction. Compared with the prior art, there is no need to increase the wall thickness of the caisson, which can save the engineering cost and construction period of the caisson.

[0034] 2. The present invention provides a construction method for an anti-floating caisson structure, which comprises constructing a rotary jet section with a radial dimension exceeding the diameter of the anchor hole below the sealing layer by a rotary jet forming method, and filling the anchor hole with the grouting section by a grouting forming method, thereby finally forming an anchor body containing an anchor cable to connect the caisson and the sealing layer to each other, thereby making full use of the sealing layer and the anchor body to increase the anti-floating force of the caisson, thereby greatly improving the safety and construction quality of subsequent construction and avoiding the situation where the caisson floats and becomes unstable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the vertical cross-section structure of an anti-floating and sinking well structure of the present invention;

[0036] Figure 2 yes Figure 1 A schematic diagram of the partially enlarged cross-sectional structure at position Ⅰ in the middle;

[0037] Figure 3 yes Figure 1 A schematic diagram of the partially enlarged cross-sectional structure at the middle II;

[0038] Figure 4 It is a three-dimensional structural schematic diagram of a bundle body of an anti-floating and sinking well structure of the present invention;

[0039] Figure 5 This is a schematic diagram of the planar layout structure of an anti-floating and sinking well structure of the present invention. Figure 1 ;

[0040] Figure 6 This is a schematic diagram of the planar layout structure of an anti-floating and sinking well structure of the present invention. Figure 2 ;

[0041] Figure 7 This is a schematic diagram of the working steps of a construction method of an anti-floating and sinking well structure of the present invention. Figure 1 ;

[0042] Figure 8 This is a schematic diagram of the working steps of a construction method of an anti-floating and sinking well structure of the present invention. Figure 2 ;

[0043] Fig. 9 This is a schematic diagram of the working steps of a construction method of an anti-floating and sinking well structure of the present invention. Figure 3 ;

[0044] Fig.10 This is a schematic diagram of the working steps of a construction method of an anti-floating and sinking well structure of the present invention. Figure 4 ;

[0045] Fig.11 This is a schematic diagram of the working steps of a construction method of an anti-floating and sinking well structure of the present invention. Figure 5 ;

[0046] Fig.12 This is a schematic diagram of the working steps of a construction method of an anti-floating and sinking well structure of the present invention. Figure 6 ;

[0047] icon:

[0048] 1-caisson; 11-blade foot; 12-buried pipe;

[0049] 2-sealing layer; 3-bottom plate; 4-anchor hole;

[0050] 5-bundle body; 51-anchor cable; 52-centering bracket; 53-guide tube;

[0051] 6-anchor body; 61-grouting section; 62-jet spraying section;

[0052] 7-anchoring structure; 71-clip anchor; 72-anchor pad; 73-waterproof rubber strip;

[0053] 8-sealing and anchoring structure; 9-soil. DETAILED DESCRIPTION

[0054] The present invention is further described in detail below in conjunction with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0055] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all expressions based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0056] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0057] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0058] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0059] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0060] Example 1

[0061] like Figures 1 to 12 As shown, an anti-floating caisson structure comprises a caisson 1, a sealing layer 2, an anchor hole 4, an anchor body 6 and a bundle body 5; the anchor hole 4 is arranged along the axial direction of the caisson 1, and the anchor hole 4 passes through the well wall and the sealing layer 2 of the caisson 1; the anchor body 6 comprises a grouting section 61 and a rotary jet section 62; the grouting section 61 is filled in the anchor hole 4, and the grouting section 61 is a grouting molding structure; the rotary jet section 62 is connected to the bottom end of the grouting section 61, and the top surface of the rotary jet section 62 abuts against the bottom surface of the sealing layer 2; the rotary jet section 62 is a high-pressure rotary jet molding structure, and the radial size of the rotary jet section 62 along the anchor hole 4 is greater than the diameter of the anchor hole 4; the bundle body 5 comprises at least one bundle of anchor cables 51, one end of the anchor cable 51 is anchored and connected to the top end of the caisson 1 through the anchoring structure 7, and the other end of the anchor cable 51 passes through the grouting section 61 and extends into the rotary jet section 62.

[0062] It should be noted that in order to facilitate the display of smaller components in the caisson 1, such as the anchor structure 7 and the bundle 5, Figures 1 to 12 The components such as caisson 1 and bottom sealing layer 2 are scaled and do not represent the actual sizes.

[0063] In the above embodiment, the number of the anchor holes 4 can be one or more; when the number of the anchor holes 4 is greater than one, Figures 5 and 6 As shown, the anchor holes 4 are distributed at intervals along the circumference of the caisson 1 .

[0064] In the above embodiment, the anchoring structure 7 can use existing mature anchor products, such as steel cone anchors, pier head anchors, nut anchors; for example Figure 2 As shown, the anchoring structure 7 of this embodiment includes a clip-type anchor 71, and the anchor cable 51 is connected to the clip-type anchor 71; the bottom of the clip-type anchor 71 is connected to the top surface of the caisson 1 through an anchor pad 72 whose diameter is larger than the diameter of the anchor hole 4, and a waterproof rubber strip 73 can also be arranged between the anchor pad 72 and the top surface of the caisson 1.

[0065] In the above-mentioned embodiment, both grouting forming and high-pressure rotary spraying forming can adopt existing technologies; for example, slurry is injected into the anchor hole 4 under high pressure (30-50MPa), and after the slurry hardens, a grouting section 61 that can connect the anchor cable 51, the caisson 1 and the sealing layer 2 to each other can be formed; or high-pressure slurry (30-50MPa) is sprayed around the anchor hole 4 along the radial direction through a rotary spray head, thereby destroying the structure of the surrounding soil 9, so that the slurry can be bonded and hardened with the surrounding soil 9 to form a roughly cylindrical rotary spraying section 62, and the diameter of the rotary spraying section 62 is larger than the diameter of the anchor hole 4.

[0066] In an optional embodiment, pre-buried pipes 12 are further provided in the wall of the caisson 1, the number and position of the pre-buried pipes 12 match the number and position of the anchor holes 4, and the inner diameter of the pre-buried pipes 12 is greater than or equal to the diameter of the anchor holes 4, so that the pre-buried pipes 12 can be directly used as anchor holes 4 in the caisson 1.

[0067] In an optional embodiment, the embedded pipe 12 is made of steel pipe. On the one hand, it can prevent the embedded pipe 12 from being deformed due to the squeezing of concrete when pouring the caisson 1; on the other hand, it can also form a steel-concrete structure at the embedded pipe 12, thereby preventing the anchor hole 4 from weakening the structural strength of the caisson 1.

[0068] In an optional embodiment, one end of the embedded pipe 12 close to the sealing layer 2 passes through the blade foot 11 of the caisson 1 and penetrates the sealing layer 2. It should be noted that the portion of the embedded pipe 12 that penetrates the sealing layer 2 only needs to be able to guide the drill bit. Figure 7 As shown, its end does not need to completely penetrate the bottom cover 2.

[0069] In an optional embodiment, the embedded pipe 12 is divided into at least two sections along its length direction. If the caisson 1 is also a segmented structure along its axis direction, the number and size of the segments of the embedded pipe 12 can match the number and size of the segments of the caisson 1; and two adjacent segments can be connected by welding or threading.

[0070] In an optional embodiment, the bundle body 5 further includes a guide tube 53 , which is disposed in the anchor hole 4 , and the inner diameter of the guide tube 53 is greater than the diameter of the jet grouting head of the jet grouting drill.

[0071] In an optional embodiment, since the guide tube 53 only needs to provide guidance for the rotary sprinkler head, the guide tube 53 can be made of a PVC tube, so that it can be used to lower the rotary sprinkler head to a predetermined depth below the sealing layer 2, and can also be ruptured by the high-pressure slurry when the rotary sprinkler head is grouting, so as to avoid the guide tube 53 interfering with the grouting operation of the rotary sprinkler head; and the lower weight of the PVC tube can also reduce the cost of the guide tube 53 and the difficulty of installing the guide tube 53.

[0072] In an optional embodiment, the number of anchor cables 51 in each anchor hole 4 is at least two.

[0073] In an optional embodiment, the bundle body 5 also includes a centering bracket 52, which is arranged in the anchor hole 4, and the side wall of the centering bracket 52 is gap-matched with the side wall of the anchor hole 4. A limiting hole is arranged on the centering bracket 52, and the limiting holes are centrally symmetrically distributed relative to the axis of the anchor hole 4. The number of the limiting holes matches the number of anchor cables 51, and each anchor cable 51 passes through each limiting hole respectively.

[0074] In an optional embodiment, when the bundle body 5 includes a guide tube 53, the centering bracket 52 may also include a limiting hole for limiting the guide tube 53, and the limiting hole for limiting the guide tube 53 is located at the center of the centering bracket 52 to ensure the coaxiality of the rotary grouting section 62 obtained by subsequent high-pressure rotary grouting relative to the grouting section 61.

[0075] In an optional embodiment, the number of the centering brackets 52 is greater than one, and the centering brackets 52 are spaced apart along the length direction of the anchor cable 51, for example Figure 4 shown.

[0076] In an optional embodiment, the anchor cable 51 includes a prestressed anchor cable 51 .

[0077] In an optional embodiment, the anchor structure 7 is further wrapped with an anchor sealing structure 8. The anchor sealing structure 8 can wrap the anchor structure 7 and protect it from environmental erosion, and its specific form includes but is not limited to a rubber protective sleeve and a cement mortar anchor sealing structure.

[0078] Example 2

[0079] A construction method for an anti-floating and sinking well structure, applied to an anti-floating and sinking well structure in Example 1, comprises the following steps:

[0080] S1, such as Figures 7 and 8 As shown, the caisson 1 is constructed, the caisson 1 is sunk to the designed elevation, and the caisson 1 is fixed by a well wall lifting device so that it does not sink any further; the caisson 1 is radially corrected until the verticality of the caisson 1 meets the requirements; the soil 9 under the blade foot 11 of the caisson 1 and a certain range outside the caisson 1 is excavated by a shaft boring machine or a high-pressure water jet method, and the excavation depth should meet the designed thickness of the sealing layer 2; the sealing layer 2 is cast using underwater plain concrete;

[0081] In an optional embodiment, when constructing the caisson 1, a pre-buried pipe 12 can be pre-buried in the caisson 1 to reduce the drilling workload of the subsequent anchor holes 4; and if the caisson 1 is a segmented structure, the pre-buried pipe 12 can also be divided into at least two segments.

[0082] S2, such as Fig. 9 As shown, the anchor hole 4 is constructed using a drilling machine until the bottom of the anchor hole 4 reaches a predetermined depth of the rotary spraying section 62 ; and the bundle body 5 is placed in the anchor hole 4 .

[0083] In an optional embodiment, if a pre-buried pipe 12 is provided in the wall of the caisson 1, the drill bit of the drilling machine can be directly placed into the pre-buried pipe 12 in this step, and drilled along the bottom of the pre-buried pipe 12 until it reaches the sealing layer 2, and then drilling is started downward from the sealing layer 2, thereby greatly reducing the amount of drilling work.

[0084] S3, such as Figure 10 to Figure 11 As shown, the jet grouting head of the jet grouting drill is lowered along the anchor hole 4 to below the bottom sealing layer 2; the jet grouting head is lifted up, and during the lifting process, the high-pressure jet grouting section 62 and the grouting section 61 are performed until the construction of the anchor body 6 is completed. It should be noted that Fig.11 The section line of the soil body 9 is removed, and the section line is added only for the anchor body 6, only to facilitate the identification of the size difference between the rotary jet section 62 and the grouting section 61.

[0085] In an optional implementation manner, if the bundle body 5 includes a guide tube 53 , the spin spray head can be placed in the guide tube 53 when the spin spray head is at the bottom.

[0086] S4, such as Fig.12 As shown, after the anchor body 6 reaches the specified strength requirement, the anchor cable 51 is anchored and connected to the caisson 1; for example, a waterproof rubber strip 73, an anchor pad 72 and a clip-type anchor 71 are arranged on the top surface of the caisson 1 from bottom to top, and the anchor cable 51 is connected to the clip-type anchor 71; if the anchor cable 51 includes a prestressed anchor cable 51, the anchor cable 51 also needs to be tensioned in this step; then the sealing anchor structure 8 is constructed to lock the anchor cable 51.

[0087] S5. Pump water out of the well, construct the bottom plate 3 of caisson 1 and other auxiliary structures in the well, and complete the construction of caisson 1.

[0088] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-floating caisson structure, comprising a caisson (1) and a sealing layer (2), characterized in that: Also includes: An anchor hole (4), the anchor hole (4) being arranged along the axial direction of the caisson (1), and the anchor hole (4) penetrating the wall of the caisson (1) and the sealing layer (2); An anchor body (6), the anchor body (6) comprising a grouting section (61) and a rotary spraying section (62); the grouting section (61) is filled inside the anchor hole (4), and the grouting section (61) is a grouting molding structure; the rotary spraying section (62) is connected to the grouting section (61) and is located below the sealing layer (2), the rotary spraying section (62) is a high-pressure rotary spraying molding structure, and the radial dimension of the rotary spraying section (62) along the anchor hole (4) is greater than the diameter of the anchor hole (4); An anchor cable (51), one end of the anchor cable (51) is anchored to the top of the caisson (1) through an anchoring structure (7), and the other end of the anchor cable (51) passes through the grouting section (61) and extends into the interior of the rotary jet section (62).

2. The anti-floating and sinking well structure according to claim 1, characterized in that: Pre-buried pipes (12) are also arranged in the wall of the caisson (1); the number and position of the pre-buried pipes (12) match the number and position of the anchor holes (4); and the inner diameter of the pre-buried pipes (12) is greater than or equal to the diameter of the anchor holes (4).

3. The anti-floating and sinking well structure according to claim 2, characterized in that: One end of the embedded pipe (12) close to the sealing layer (2) penetrates into the sealing layer (2).

4. The anti-floating and sinking well structure according to claim 2, characterized in that: The embedded pipe (12) is divided into at least two sections along its length direction.

5. The anti-floating and sinking well structure according to claim 1, characterized in that: A guide tube (53) is also provided in the anchor hole (4), and the inner diameter of the guide tube (53) is larger than the diameter of the jet grouting head of the jet grouting drilling machine.

6. An anti-floating and sinking well structure according to any one of claims 1 to 5, characterized in that: The number of the anchor cables (51) in each anchor hole (4) is at least two.

7. The anti-floating and sinking well structure according to claim 6, characterized in that: A centering bracket (52) is also provided in the anchor hole (4), and the side wall of the centering bracket (52) is clearance-matched with the side wall of the anchor hole (4). The centering bracket (52) is provided with limiting holes, and the number of the limiting holes matches the number of the anchor cables (51), and each of the anchor cables (51) passes through each of the limiting holes respectively.

8. An anti-floating and sinking well structure according to any one of claims 1 to 5, characterized in that: The anchor cable (51) comprises a prestressed anchor cable (51).

9. An anti-floating and sinking well structure according to any one of claims 1 to 5, characterized in that: The anchoring structure (7) is also wrapped with an anchor sealing structure (8).

10. A construction method for an anti-floating and sinking well structure, characterized in that: An anti-floating and sinking well structure as claimed in any one of claims 1 to 9 comprises the following steps: S1, constructing the caisson (1), sinking the caisson (1) to a designed elevation, and fixing the caisson (1); Constructing a sealing layer (2) below the caisson (1); S2, constructing an anchor hole (4), placing an anchor cable (51) into the anchor hole (4); S3, lowering the jet grouting head of the jet grouting drill along the anchor hole (4) to below the bottom layer (2); lifting the jet grouting head, during which the high-pressure jet grouting section (62) and the grouting section (61) are constructed, until the construction of the anchor body (6) is completed; S4, anchoring the anchor cable (51) to the caisson (1).

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