Rock stratum foundation open caisson water stop structure and system

Abstract

The utility model relates to the technical field of open caissons, in particular to a rock foundation open caisson water stop structure and system. The water stop structure comprises an open caisson located on bed rock, and a tenon protruding downwards is arranged at the bottom of the open caisson. The open caisson further comprises a grouting channel surrounding the side face and the bottom face of the tenon, the grouting channel is defined by the bed rock, the open caisson and the surface of the tenon, and a pouring body formed through pouring is arranged in the grouting channel. According to the water stop structure for the open caisson of the rock stratum foundation, the problem of seepage prevention between the rock stratum and the open caisson can be well solved, the overall water stop effect can be better improved, and the water stop requirement is met.

Description

Technical Field

[0001] This utility model relates to the field of caisson technology, and in particular to a water-stopping structure and system for caissons in rock foundations. Background Technology

[0002] In engineering, caissons are commonly used as water-retaining structural components. Caissons are typically constructed from highly impermeable concrete, which provides excellent waterproofing. However, the interface between the caisson and the foundation is a weak point in waterproofing. The key to a caisson's effective water retention lies in properly addressing the water-stopping effect at this interface. Technicians analyzed the reasons why the interface between the caisson and the foundation is prone to water seepage: firstly, some foundations are relatively loose and inherently prone to water infiltration; secondly, the caisson and the foundation are composed of two different materials, making it difficult for their interface to adhere tightly.

[0003] To solve the first problem mentioned above, those skilled in the art chose to place the caisson on a rock foundation with good impermeability. However, how to improve the water-stopping effect between the rock foundation and the caisson has become a new problem for the technicians. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a water-stopping structure and system for caissons in rock foundations, which can better solve the seepage prevention problem between rock foundations and caissons, improve the overall water-stopping effect, and meet the water-blocking requirements.

[0005] In a first aspect, the present invention provides a water-stopping structure for a caisson foundation, comprising a caisson situated on bedrock, wherein the bottom of the caisson is provided with a downwardly protruding tenon; and further comprising a grouting channel surrounding the side and bottom of the tenon, wherein the grouting channel is formed by the surfaces of the bedrock, the caisson and the tenon, and wherein a cast-in-place body is formed within the grouting channel.

[0006] This utility model provides a water-stopping structure for a caisson foundation. By setting a tenon protruding downwards from the bottom of the caisson, the water seepage channel at the bottom of the caisson can be extended, improving the water-stopping effect. By setting a grouting channel on the side and bottom of the tenon, which is enclosed by the bedrock, the caisson and the surface of the tenon, and the grouting channel contains a cast-in-place material, the flow characteristics of the cast-in-place material before solidification can be used to fill the cracks in the bedrock and the gaps between the bedrock and the tenon, thereby further improving the water-stopping effect.

[0007] The rock foundation caisson water-stopping structure described in this utility model can effectively address the seepage prevention problem between the rock strata and the caisson, thereby improving the overall water-stopping effect and meeting the water-blocking requirements.

[0008] Preferably, the casting body includes a first casting body and a second casting body, the first casting body is located outside the water-facing side of the caisson, and the second casting body is located below the caisson or tenon; the first casting body and the second casting body are connected; the top surface of the first casting body is higher than the top surface of the second casting body.

[0009] Preferably, it further includes a first grouting pipe, the lower opening of which is located at the junction of the first cast body and the bedrock, and the upper opening of which extends out of the top surface of the first cast body.

[0010] Preferably, the cross-section of the tenon is an inverted trapezoid, including a first side and a second side opposite to each other. The first side is flush with the water-facing surface of the caisson, and the second side has a horizontal inclination angle α, 40°≤α≤75°.

[0011] Preferably, an anchor bolt is provided between the caisson and the bedrock, with the upper part of the anchor bolt located inside the bottom plate of the caisson and the lower part of the anchor bolt located inside the bedrock.

[0012] Preferably, the anchor rod has a horizontal inclination angle b, 50°≤b≤70°; the upper end of the anchor rod is closer to the backwater side of the caisson than the lower end.

[0013] Preferably, a placement trough is provided on the bedrock, the bottom surface of the placement trough is lower than the surrounding rock surface, and the lower part of the caisson is located in the placement trough.

[0014] Preferably, the bottom surface of the placement groove is a roughened surface.

[0015] Preferably, a plain concrete layer is provided between the bottom plate of the caisson and the bottom surface of the placement trough, and the plain concrete layer is formed by concrete pouring.

[0016] Preferably, at least two second grouting pipes are provided in the bedrock, and the second grouting pipes are arranged vertically.

[0017] In some cases, if the cracks on the rock surface are relatively large, a second grouting pipe can be driven into the bedrock to fill the cracks in the bedrock through grouting.

[0018] Preferably, the caisson has a slope on its backwater side, and soil is provided between the slope and the caisson. A third grouting pipe is buried in the slope.

[0019] In a second aspect, the present invention provides a rock foundation caisson water-stopping system, including the rock foundation caisson water-stopping structure as described above, wherein the caisson and the tenon are integrally cast, and the caisson is backfilled with stone and / or soil.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] This utility model provides a water-stopping structure for caissons in rock foundations. By setting a tenon protruding downwards from the bottom of the caisson, the seepage channel at the bottom of the caisson can be extended, improving the water-stopping effect. Furthermore, by setting grouting channels on the sides and bottom of the tenon, which are enclosed by the bedrock, the caisson, and the surface of the tenon, and containing a cast-in-place material, the flow characteristics of the cast-in-place material before solidification can be used to fill cracks in the bedrock and gaps between the bedrock and the tenon, thereby further improving the water-stopping effect. The water-stopping structure for caissons in rock foundations described in this utility model can effectively address the seepage problem between the rock strata and the caisson, improving the overall water-stopping effect and meeting the requirements for water retention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the arrangement of the caisson described in this utility model;

[0023] Figure 2 This is a detailed drawing of the rock foundation caisson water-stopping structure described in this utility model;

[0024] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0025] Figure 4 This is a schematic diagram of the arrangement of the second grouting pipe of this utility model;

[0026] Figure 5 This is a schematic diagram of the arrangement of the third grouting pipe described in this utility model;

[0027] Figure 6 This is a construction diagram of the rock foundation caisson water-stopping structure described in this utility model. Figure 1 ;

[0028] Figure 7 This is a construction diagram of the rock foundation caisson water-stopping structure described in this utility model. Figure 2 ;

[0029] Figure 8 This is a construction diagram of the rock foundation caisson water-stopping structure described in this utility model. Figure 3 ;

[0030] Figure 9 This is a construction diagram of the rock foundation caisson water-stopping structure described in this utility model. Figure 4 .

[0031] Marked in the image:

[0032] 1- Caisson;

[0033] 11-Water-facing side; 12-Backwater side; 13-Bottom slab;

[0034] 2-Tongue;

[0035] 21 - First side view; 22 - Second side view;

[0036] 3-Cast-in-place;

[0037] 31-First opening; 32-Second opening; 33-First cast-in-place body; 34-Second cast-in-place body;

[0038] 4-First grouting pipe;

[0039] 5-Anchor bolt;

[0040] 6-Placement slot;

[0041] 61 - Plain concrete layer;

[0042] 7- Bedrock;

[0043] 71-Pit;

[0044] 8-Second grouting pipe;

[0045] 9-Third grouting pipe. Detailed Implementation

[0046] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0047] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0048] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0049] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0050] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0051] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0052] Example 1

[0053] like Figures 1 to 3 As shown, this embodiment provides a rock foundation caisson water-stopping structure, including a caisson 1 sitting on bedrock 7, with a downward protruding tenon 2 at the bottom of the caisson 1; it also includes a grouting channel surrounding the side and bottom of the tenon 2, the grouting channel being formed by the surfaces of the bedrock 7, the caisson 1 and the tenon 2, and having a cast body 3 formed by casting inside the grouting channel.

[0054] Caisson 1 is a structural component that serves to block water. It is usually formed by concrete pouring and is commonly used for slope protection on riverbanks. It can also be used for the enclosure of dry docks. In some embodiments, caisson 1 is also called a caisson box. By embedding caisson 1 into rock or soil, the water-blocking function is achieved by utilizing the impermeability of the concrete on the surface of caisson 1. In order to reduce the backward movement of caisson 1 under water pressure and maintain the relative stability of the position of caisson 1, the internal cavity of caisson 1 can be backfilled with crushed stone or soil to increase its weight.

[0055] Bedrock 7 refers to a hard rock layer in the surface layer of the earth, such as granite, which is often covered by a soil layer. Intact bedrock 7 usually has good impermeability. In this embodiment, the caisson 1 is set on the bedrock 7 in order to use the impermeability of the bedrock 7 to reduce the water leakage from the bedrock 7 and improve the overall water-blocking effect. However, the bedrock 7 in the existing foundation often has cracks, and water may seep out from the cracks. Therefore, it is necessary to treat the cracks.

[0056] To improve the water-stopping effect between the bottom of the caisson 1 and the bedrock 7, this embodiment provides a downwardly protruding tenon 2 at the bottom of the caisson 1. The tenon 2 extends along the length of the caisson 1, such as... Figure 2 As shown, the tenon 2 can be a concrete structure. By protruding from the bottom of the caisson 1, it can extend the water seepage channel and improve the water-stopping effect.

[0057] It is understandable that, due to the different materials of the bedrock 7 and the tenon 2, and the greater hardness of the bedrock 7, gaps may exist between the tenon 2 and the bedrock 7, affecting the water-stopping effect. Therefore, in this embodiment, grouting channels formed by the bedrock 7, the caisson 1, and the surface of the tenon 2 are provided on the side and bottom surfaces of the tenon 2. By pouring grout into the grouting channels to form a cast body 3, the flow characteristics of the grout can be used to fill the cracks inside the bedrock 7 and the gaps between the tenon 2 and the bedrock 7, giving the solidified cast body 3 a better sealing effect, thereby improving the overall water-stopping effect. Preferably, the grout can be concrete, cement mortar, etc., such as C30 plain concrete.

[0058] This embodiment lengthens the leakage channel on the side most prone to leakage, effectively extending the leakage path. As long as there is a water stop on this path, water seepage in subsequent structures can be avoided or reduced.

[0059] Therefore, the rock foundation caisson water-stopping structure provided in this embodiment can extend the water seepage channel at the bottom of the caisson 1 and improve the water-stopping effect by setting a tenon 2 that protrudes downward from the bottom surface of the caisson 1. By setting a grouting channel formed by the bedrock 7, the caisson 1 and the surface of the tenon 2 on the side and bottom surface, and the grouting channel has a cast body 3 formed by casting, the flow characteristics of the cast body 3 before solidification can be used to fill the cracks on the bedrock 7 and the gaps between the bedrock 7 and the tenon 2, thereby further improving the water-stopping effect.

[0060] The rock foundation caisson water-stopping structure described in this embodiment can effectively address the seepage prevention problem between the rock strata and the caisson, thereby improving the overall water-stopping effect and meeting the water-blocking requirements.

[0061] Preferably, the grouting channel has a first opening 31 and a second opening 32, wherein the first opening 31 is located outside the water-facing side 11 of the caisson 1, and the second opening 32 is located below the caisson 1.

[0062] It can be understood that the first opening 31 and the second opening 32 refer to the openings of the grouting channel formed by the surfaces of the bedrock 7, the caisson 1 and the tenon 2. They may be covered by other structures during later construction. The significance of the first opening 31 and the second opening 32 is that grout can be injected into the grouting channel through the first opening 31 and the second opening 32 to form the cast body 3.

[0063] In some embodiments, the casting body 3 includes a first casting body 33 and a second casting body 34. The first casting body 33 is located outside the side of the caisson 1, and the second casting body 34 is located below the caisson 1 or the tenon 2. The first casting body 33 and the second casting body 34 are connected.

[0064] like Figure 2 As shown, the first casting body 33 and the second casting body 34 refer to different parts of the casting body 3. Preferably, the tenon 2 is located near the water-facing side 11 of the caisson 1, and the first casting body 33 is located outside the water-facing side 11 of the caisson 1. The water-facing side 11 of the caisson 1 is the side of the caisson 1 that is closest to the water in its designed use state. For example, when the caisson 1 is located by a river, the water-facing side 11 is the side closest to the river water. When the caisson 1 is used to protect a dry dock, the water-facing side 11 can be the side closest to the dry dock. The backwater side 12 is opposite to the water-facing side 11. In some cases, both opposite sides of the caisson 1 are near water. In this case, the water-facing side 11 is the side with a higher water level or greater water pressure.

[0065] The first casting body 33 and the second casting body 34 can be formed by casting separately. For example, the first casting body 33 can be formed by casting grout from the first opening 31, and the second casting body 34 can be formed by casting grout from the second opening 32. Due to the flow characteristics of the grout, the interface between the first casting body 33 and the second casting body 34 is not necessarily a flat plane. In the preferred construction method, the second casting body 34 is cast first, and then the first casting body 33 is cast. The first casting body 33 and the second casting body 34 are connected near the bottom surface of the tenon 2.

[0066] Preferably, before pouring the first casting body 33, the exposed surface of the second casting body 34 is roughened to improve the tightness of the fit between the first casting body 33 and the second casting body 34 and improve the seepage prevention effect.

[0067] Preferably, the top surface of the first casting body 33 is higher than the top surface of the second casting body 34; the top surface of the first casting body 33 is located near the first opening 31, and the top surface of the second casting body 34 is located near the second opening 32; it can be understood that the top surface of the second casting body 34 is limited by the bottom plate 13 of the caisson 1. In order to improve the overall water-stopping effect of the casting body 3 and extend the water seepage channel, the height of the first casting body 33 can be increased so that it extends upward to the side of the caisson 1.

[0068] In some embodiments, a first grouting pipe 4 is also included, with the lower opening of the first grouting pipe 4 located at the junction of the first cast-in-place body 33 and the bedrock 7, and the upper opening of the first grouting pipe 4 extending out of the top surface of the first cast-in-place body 33.

[0069] The first grouting pipe 4 penetrates the first cast body 33, and its material can be PVC pipe. The lower end of the first grouting pipe 4 is located at the junction of the first cast body 33 and the bedrock 7. After the first cast body 33 is formed, grout can be injected into the junction of the first cast body 33 and the bedrock 7 through the first grouting pipe 4 to more fully fill the cracks in the bedrock 7 and the gaps between the bedrock 7 and the cast body 3, thereby further improving the water-stopping effect.

[0070] It is understandable that the bedrock 7 is usually quite hard, making it difficult to roughen. This results in multiple smooth surfaces on the surface of the bedrock 7. However, the adhesion between these smooth surfaces and the concrete or cement mortar is poor, making it easy for water to seep into the two surfaces. Therefore, in this embodiment, the interface is grouted through the first grouting pipe 4. This not only further fills the gaps on the bedrock 7, but also compacts the junction between the bedrock 7 and the first cast-in-place body 33 through pressure, reducing the occurrence of seepage.

[0071] Preferably, the first grouting pipe 4 can be arranged at intervals along the length of the first cast body 33.

[0072] In some embodiments, the tenon 2 has an inverted trapezoidal cross section, including a first side 21 and a second side 22 opposite to each other. The first side 21 is flush with the surface of the water-facing side 11 of the caisson 1, and the second side 22 has a horizontal inclination angle α.

[0073] The first side 21 is flush with the surface of the water-facing side 11 of the caisson 1, which can reduce the unevenness between the tenon 2 and the caisson 1. This not only facilitates grout filling but also reduces stress concentration, especially when the caisson 1 is subjected to lateral water pressure. The second side 22 has a horizontal inclination angle, which can reduce the damage caused by the reaction force of the second casting body 34 on the tenon 2.

[0074] Preferably, 40° ≤ a ≤ 75°. More preferably, a = 60°.

[0075] In some embodiments, an anchor rod 5 is provided between the caisson 1 and the bedrock 7, with the upper part of the anchor rod 5 located inside the bottom plate 13 of the caisson 1 and the lower part of the anchor rod 5 located inside the bedrock 7.

[0076] The anchor bolts 5 can increase the interlocking force between the caisson 1 and the bedrock 7 to resist lateral water pressure, reduce the backward movement of the caisson 1, and improve the stability of the caisson 1 position. The anchor bolts 5 can be driven into the bedrock 7 in advance and exposed at the top. When the caisson 1 is subsequently cast in place, the upper part of the anchor bolts 5 is placed inside the bottom plate 13 of the caisson 1.

[0077] During construction, holes can be drilled in the bedrock 7 first, and the anchor rod 5 can be placed into the holes and grout injected into the holes to improve the anchoring strength between the anchor rod 5 and the bedrock 7.

[0078] Preferably, the anchor rod 5 has a horizontal inclination angle b, 50°≤b≤70°, and the upper end of the anchor rod 5 is closer to the backwater side 12 of the caisson 1 than the lower end; the inclined setting of the anchor rod 5 can further improve the ability of the caisson 1 to resist the water pressure transmitted from the water-adjacent side 11; more preferably, b=60°.

[0079] Preferably, the upper part of the anchor rod 5 has a horizontal bend to improve the connection strength between the anchor rod 5 and the caisson 1.

[0080] Example 2

[0081] This embodiment provides a rock foundation caisson water-stopping structure. Based on embodiment 1, a placement groove 6 is provided on the bedrock 7. The bottom surface of the placement groove 6 is lower than the surrounding rock surface, and the lower part of the caisson 1 is located in the placement groove 6.

[0082] The placement trough 6 is a trough-shaped structure set on the upper surface of the bedrock 7, including the trough bottom and the trough walls on both sides. The bottom of the placement trough 6 is lower than the surrounding existing rock surface, which not only facilitates increasing the vertical height of the first cast-in-place body 33 to form a longer seepage path, but also improves the fixing effect of the bedrock 7 on the caisson 1. The trough walls of the placement trough 6 can apply a horizontal force to the caisson 1 to reduce the displacement of the caisson 1 and maintain the stability of the position of the caisson 1.

[0083] In some embodiments, since the bedrock 7 is difficult to excavate, the depth of the placement trench 6 can be 1.3 meters to 3 meters.

[0084] Preferably, the bottom surface of the placement groove 6 is a roughened surface, which can be roughened to improve the adhesion and increase the water-stopping effect.

[0085] Preferably, a plain concrete layer 61 is provided between the bottom plate 13 of the caisson 1 and the bottom surface of the placement trench 6. The plain concrete layer 61 is formed by concrete pouring. The plain concrete layer 61 can level the bottom surface of the placement trench 6 and fill the cracks in the bedrock 7.

[0086] More preferably, plain concrete is used to fill the space between the backwater side 12 of the caisson 1 and the wall of the placement tank 6.

[0087] Example 3

[0088] like Figure 4 As shown, this embodiment provides a rock foundation caisson water-stopping structure, which, based on embodiment 1 or 2, includes at least two second grouting pipes 8 installed in the bedrock 7, with the second grouting pipes 8 installed vertically.

[0089] In some cases, if the cracks on the rock surface are relatively large, a second grouting pipe 8 can be driven into the bedrock 7 to grout the bedrock 7 below the caisson 1, thereby filling the cracks in the bedrock 7.

[0090] In some implementations, the caisson 1 can be further supported by backfilling on the backwater side 12 to reduce the rearward movement of the caisson 1.

[0091] Furthermore, such as Figure 5 As shown, if the backwater side 12 of the caisson 1 is a mountain slope, the soil can be filled between the slope and the caisson 1; the third grouting pipe 9 can also be buried in layers on the slope, and the soil can be filled and grouted in layers to improve the strength of the slope and the hardness of the fill.

[0092] Example 4

[0093] This embodiment provides a rock foundation caisson water-stopping system, including the rock foundation caisson water-stopping structure as described in Embodiment 1, 2 or 3.

[0094] Preferably, the caisson 1 and the tenon 2 are cast as a single piece; the caisson 1 is backfilled with stones and / or soil to increase its self-weight.

[0095] Example 5

[0096] like Figures 6 to 9 As shown, this embodiment provides a construction method for constructing a rock foundation caisson water-stopping system as described in Embodiment 4, comprising the following steps:

[0097] S1. Excavate a placement trench 6 on the bedrock 7, and excavate a pit 71 between the placement trench 6 and the existing rock surface. The pit 71 is close to the water-adjacent side 11, and the bottom of the pit 71 is lower than the bottom of the placement trench 6.

[0098] S2. Drive anchor rods 5 into the bottom surface of the placement groove 6. The upper part of the anchor rods 5 extends out of the bottom surface of the placement groove 6, and part of the anchor rods 5 can pass through the pit 71.

[0099] A first grouting pipe 4 is installed in the pit 71, with the lower opening of the first grouting pipe 4 close to the surface of the intact bedrock 7;

[0100] The second casting body 34 is formed by pouring.

[0101] The casting process forms the caisson 1 and the tenon 2.

[0102] S3. After the caisson 1 and the tenon 2 are formed, the first casting body 33 is cast. The first casting body 33 is located on the water-facing side 11 of the caisson 1, and the top surface of the first casting body 33 is higher than the top surface of the second casting body 34.

[0103] S4. Grouting is performed at the junction of the first cast-in-place body 33 and the bedrock 7 through the first grouting pipe 4.

[0104] The bottom surface of the placement trough 6 needs to be cleaned to avoid mud and sand affecting the water-stopping effect; after the second casting body 34 is formed, a plain concrete layer 61 can be laid on top of it, and then the caisson 1 and tenon 2 can be cast; if the caisson 1 is cast in sections, in step S3, only the bottom section of the caisson 1 needs to be formed before the first casting body 33 can be cast.

[0105] For bedrock with many fissures, a second grouting pipe 8 can be driven into the bedrock 7 before step S2, and the bedrock 7 can be grouted through the second grouting pipe 8.

[0106] Figure 6 The bedrock 7 on the left side is covered with loose gravel and soil. This gravel and soil can temporarily fix the first grouting pipe 4 and can be removed before pouring the first grouting body 33.

[0107] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rock ground caisson water stop structure characterized by, It includes a caisson (1) situated on bedrock (7), the bottom of which is provided with a downwardly protruding tenon (2); it also includes a grouting channel surrounding the side and bottom of the tenon (2), the grouting channel being formed by the surfaces of the bedrock (7), the caisson (1) and the tenon (2), and the grouting channel containing a cast body (3) formed by casting.

2. The rock ground caisson waterstop construction according to claim 1, characterized by, The casting body (3) includes a first casting body (33) and a second casting body (34). The first casting body (33) is located outside the water-facing side (11) of the caisson (1), and the second casting body (34) is located below the caisson (1) or the tenon (2). The first casting body (33) and the second casting body (34) are connected. The top surface of the first casting body (33) is higher than the top surface of the second casting body (34).

3. The rock ground caisson waterstop construction according to claim 2, characterized in that, It also includes a first grouting pipe (4), the lower opening of which is located at the junction of the first cast body (33) and the bedrock (7), and the upper opening of which extends out of the top surface of the first cast body (33).

4. The rock foundation caisson water-stopping structure according to claim 1, characterized in that, The cross section of the tenon (2) is an inverted trapezoid, including a first side (21) and a second side (22) opposite to each other. The first side (21) is flush with the surface of the water-facing side (11) of the caisson (1), and the second side (22) has a horizontal inclination angle a, 40°≤a≤75°.

5. The rock ground caisson waterstop construction according to claim 1, characterized by, An anchor rod (5) is provided between the caisson (1) and the bedrock (7). The upper part of the anchor rod (5) is located in the bottom plate (13) of the caisson (1), and the lower part of the anchor rod (5) is located in the bedrock (7).

6. The rock ground caisson waterstop construction according to claim 5, characterized by, The anchor rod (5) has a horizontal inclination angle b, 50°≤b≤70°; the upper end of the anchor rod (5) is closer to the backwater side (12) of the caisson (1) than the lower end.

7. The rock ground caisson waterstop construction according to any one of claims 1 to 6, characterized in that, A placement trough (6) is provided on the bedrock (7), the bottom surface of the placement trough (6) is lower than the surrounding rock surface, and the lower part of the caisson (1) is located in the placement trough (6).

8. The rock foundation caisson water-stopping structure according to claim 7, characterized in that: The bottom surface of the placement groove (6) is a roughened surface; And / or, a plain concrete layer (61) is provided between the bottom plate (13) of the caisson (1) and the bottom surface of the placement trough (6), the plain concrete layer (61) being formed by concrete pouring.

9. The rock foundation caisson water-stopping structure according to any one of claims 1-6, characterized in that: At least two second grouting pipes (8) are provided in the bedrock (7), and the second grouting pipes (8) are arranged vertically; And / or, the backwater side (12) of the caisson (1) has a slope, and soil is provided between the slope and the caisson (1), and a third grouting pipe (9) is buried in the slope.

10. A rock ground caisson water stop system, characterized by, The caisson water-stopping structure for rock foundation as described in any one of claims 1-9 is provided, wherein the caisson (1) and the tenon (2) are cast in one piece, and the caisson (1) is backfilled with stone and / or soil.

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