Underground cavern rock anchor beam structure and underground powerhouse applying same

Abstract

The utility model provides a kind of underground chamber rock anchor beam structure, including rock anchor beam main body, multiple first anchor rod / cable, multiple second anchor rod / cable and multiple anchorage hole concrete pouring parts, rock anchor beam main body is anchored with the same side surrounding rock wall of underground chamber and pours connection;Rock anchor beam main body is fixed on the same side surrounding rock wall of underground chamber;Multiple anchorage holes are provided in the surrounding rock wall of underground chamber with interval, anchorage hole concrete pouring part is formed by pouring through anchorage hole, rock anchor beam main body is respectively formed with multiple anchorage hole concrete pouring parts Pouring molding, the hole wall rock of anchorage hole is anchored by multiple first anchor rod / cable, the surrounding rock wall of underground chamber is anchored by multiple second anchor rod / cable.The utility model further provides a kind of underground powerhouse applied underground chamber rock anchor beam structure.The utility model has the advantages of stronger adaptability to geological conditions, simple structure, smaller construction difficulty.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering and underground plant structure design and construction technology, specifically to an underground cavern rock anchor beam structure and an underground plant using the same. Background Technology

[0002] Underground chambers refer to structures that are artificially excavated or naturally existing in underground rock and soil masses for various purposes; according to their uses, they can be divided into mine shafts (vertical shafts, inclined shafts, roadways), traffic tunnels, hydraulic tunnels, underground factories (warehouses), etc.

[0003] In the construction of underground powerhouses for large hydropower stations, to fully utilize the bearing capacity of the surrounding rock and to allow for the early deployment of overhead cranes, a rock wall crane beam structure is generally adopted. Also known as a "rock anchor beam," this structure uses long anchor rods of a certain depth to anchor the crane beam to the surrounding rock wall, ensuring sufficient bond strength between the anchor rods and the mortar, and reserving a rock bearing platform as a support surface. The crane load is transferred to the surrounding rock through the beam and anchor rods, thus eliminating the need for additional support columns. However, in practical engineering applications, the conventional rock anchor beam structure has the following problems:

[0004] 1) High requirements for geological conditions: Conventional rock anchor beam structures are generally required to be arranged in relatively good surrounding rock such as Class I to III in order to obtain a relatively complete rock platform as a support surface; when arranged in Class IV to V surrounding rock, reinforcement measures such as consolidation grouting, systematic anchor cables and reinforced concrete columns are required; Conventional structures generally have high requirements for geological conditions.

[0005] 2) Construction is difficult. When constructing conventional rock anchor beam structures, the process usually involves first blasting the middle section with a groove and reserving protective layers at both ends, followed by smooth blasting of the straight and inclined sections of the rock platform. This requires high technical skills and is difficult to construct. Especially under unfavorable geological structures or the influence of ground stress, the construction of inclined platforms is difficult, and over-excavation and damage to the rock platform occur frequently, making it difficult to form a complete rock platform.

[0006] 3) Reinforcement measures are time-consuming and costly. Conventional rock anchor beam structures often require advanced support for sections with poor geological conditions in order to protect the rock platform. After the rock platform is damaged by over-excavation, the over-excavated part also needs to be backfilled with a large amount of concrete, and reinforced with attached walls and system anchors (cables). The above reinforcement measures involve a large amount of work, a long period of time, and high investment.

[0007] Therefore, it is of great significance to develop a rock anchor beam structure that can meet the hoisting requirements of equipment in underground chambers / underground power plants and avoid the need for complex reinforcement techniques due to geological and construction defects. Utility Model Content

[0008] In view of this, and in response to the defects and deficiencies in the existing technology, this utility model proposes an underground chamber rock anchor beam structure to improve the structural stability and load-bearing capacity of the underground chamber rock anchor beam structure in conjunction with the surrounding rock; this utility model also proposes an underground powerhouse using the underground chamber rock anchor beam structure to improve the structural stability and load-bearing capacity of the underground chamber rock anchor beam structure in conjunction with the surrounding rock, and to improve the adaptability of the overhead crane hoisting equipment of the underground powerhouse to the surrounding rock of the underground chamber and the stability of the surrounding rock after the construction of the underground powerhouse, and to reduce the construction cost and construction period of the underground powerhouse equipped with overhead crane hoisting equipment.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] This utility model proposes a rock anchor beam structure for underground chambers, installed on the surrounding rock of an underground chamber. The structure includes a main rock anchor beam body and a connecting anchor assembly. The main rock anchor beam body is anchored to the surrounding rock wall on the same side of the underground chamber via a first sub-assembly of the connecting anchor assembly and is then cast in place. The first sub-assembly includes multiple first anchor rods / cables, and the second sub-assembly of the connecting anchor assembly includes multiple second anchor rods / cables. Multiple anchoring holes are spaced apart on the surrounding rock wall on the same side of the underground chamber. The underground chamber rock anchor beam structure also includes... It includes multiple anchoring hole concrete castings; the anchoring hole concrete castings are cast through corresponding anchoring holes, and the anchoring holes serve as casting molds for the anchoring hole concrete castings. After casting, the anchoring hole concrete castings are embedded in the anchoring holes; the rock anchor beam body is cast integrally with the multiple anchoring hole concrete castings / cast in stages; the rock anchor beam body is fixed to the surrounding rock wall on the same side of the underground chamber through the embedded bearing effect of the multiple anchoring hole concrete castings and the anchoring effect of the second anchor rod / anchor cable.

[0011] The rock anchor beam body is used to support a device track installed on the rock anchor beam body;

[0012] The concrete casting of the anchoring hole serves as a tenon structure between the main body of the rock anchor beam and the surrounding rock of the underground chamber, as well as a load-bearing component of the main body of the rock anchor beam. It is also used to strengthen the connection between the main body of the rock anchor beam and the surrounding rock of the underground chamber.

[0013] The first anchor bolt / anchor cable serves as a connecting anchor for anchoring the rock wall of the anchoring hole, and is also used to anchor the concrete casting of the anchoring hole to the rock wall of the anchoring hole.

[0014] The second anchor bolt / anchor cable serves as a connecting anchor for the contact load-bearing rock wall area of ​​the surrounding rock on the same side of the underground chamber, and is also used to anchor the main body of the rock anchor beam to the surrounding rock wall on the same side of the underground chamber.

[0015] Furthermore, the main body of the rock anchor beam is a cast-in-place reinforced concrete rectangular continuous beam.

[0016] Furthermore, each anchoring hole was excavated from the surrounding rock wall on one side of the underground chamber, and is distributed in a horizontal straight line.

[0017] Furthermore, the underground cavern rock anchor beam structure also includes an auxiliary support arch located below the rock anchor beam body for assisting in supporting the rock anchor beam body; the auxiliary support arch is provided with multiple downward-facing arc-shaped arch holes at intervals, and the part of the auxiliary support arch located between two adjacent arc-shaped arch holes is a support part, and each support part is combined to support the vertical load of the rock anchor beam body.

[0018] The main body of the rock anchor beam and the auxiliary support arch are cast as a single unit or cast in stages. The support part is cast as a single unit or cast in stages with the concrete casting part of the anchor hole.

[0019] Furthermore, in a virtual spatial coordinate system with the length direction of the rock anchor beam as the transverse direction, the longitudinal structural projection of the anchoring hole concrete casting component overlaps with one side of the corresponding support part.

[0020] Furthermore, the third sub-assembly of the connecting anchor assembly includes multiple third anchor rods / anchor cables, and the contact load-bearing rock wall area of ​​one side of the underground chamber is anchored to the auxiliary support arch through the third sub-assembly.

[0021] Furthermore, the side of the concrete casting component of the support that is away from the anchor hole is an inclined surface, and the angle between the inclined surface and the XZ virtual plane of the virtual space coordinate system is an acute angle, and the angle opens upward.

[0022] Furthermore, a load-bearing structural platform is excavated on one side of the surrounding rock wall of the underground chamber. The cross-sectional structure of the load-bearing structural platform is U-shaped or in the shape of vertical strokes connected together. The upper cross-sectional structure of the load-bearing structural platform is U-shaped. The upper load-bearing surface of the load-bearing structural platform is used to support various support parts. The bottom surface of each support part is cast and solidified to connect with the upper load-bearing surface of the load-bearing structural platform. Anchoring holes are excavated on the upper vertical surface of the load-bearing structural platform in the direction away from the support parts.

[0023] The longitudinal structural projection of the support portion onto the XZ virtual plane of the virtual space coordinate system is a trumpet shape, wider at the top and narrower at the bottom.

[0024] This utility model further proposes an underground powerhouse using the underground chamber rock anchor beam structure described above, comprising:

[0025] The two sets of underground chamber rock anchor beam structures are respectively set on the surrounding rock on both sides of the underground powerhouse;

[0026] The overhead crane; the overhead crane moves the hoisting equipment in the underground plant through the equipment tracks on the rock anchor beam structure of two sets of underground chambers.

[0027] The beneficial effects of this utility model are as follows:

[0028] This utility model discloses an underground cavern rock anchor beam structure. It can connect and lock multiple anchor bolts or anchor cables as a whole in the surrounding rock section where the local geological conditions of the underground cavern meet the standards. The rock anchor beam body located on each side of the anchor beam serves as the support for the equipment track. The vertical load is transferred to the anchor beam through the rock anchor beam body and multiple anchor beam concrete castings to the anchor beam. This improves the structural stability and load-bearing capacity of the underground cavern rock anchor beam structure in combination with the surrounding rock, and also provides adaptability to the surrounding rock section.

[0029] This utility model discloses an underground powerhouse using an underground chamber rock anchor beam structure, which can adapt to underground environments and surrounding rock sections with relatively relaxed geological conditions. It overcomes the technical difficulties of existing underground powerhouses, which are limited by conventional structural geological conditions, have high construction technology requirements, and are difficult to construct. It improves the adaptability of the overhead crane hoisting equipment of the underground powerhouse to the surrounding rock of the underground chamber and the stability of the surrounding rock after the construction of the underground powerhouse, and reduces the construction cost and construction period of underground powerhouses equipped with overhead crane hoisting equipment.

[0030] The overall structural load-bearing system of this utility model does not rely on a complete rock platform structure. When facing the problem of over-excavation of surrounding rock, it does not require conventional reinforcement measures such as advanced consolidation grouting, attached walls and system anchor bolts (cables). It effectively optimizes the construction period and saves investment. The rock anchor beam structure of underground powerhouse / underground chamber has strong adaptability to geological conditions, simple structure, low construction difficulty, and good application prospects. Attached Figure Description

[0031] Figure 1 This is a partial sectional view from the front of an underground cavern rock anchor beam structure according to the present invention;

[0032] Figure 2 for Figure 1 A schematic diagram of the structure in the AA view direction;

[0033] Figure 3 for Figure 1 A schematic diagram of the structure in the view of BB;

[0034] Figure 4 for Figure 1 A schematic diagram of the structure in the CC view direction;

[0035] Figure 5This is a structural cross-sectional view of the surrounding rock, load-bearing platform, and anchoring hole involved in this utility model, viewed from the left.

[0036] Figure 6 This is a frontal three-dimensional structural simulation diagram of an underground cavern rock anchor beam structure according to Embodiment 2 of this utility model;

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. First anchor bolt / anchor cable; 2. Second anchor bolt / anchor cable; 3. Third anchor bolt / anchor cable; 4. Concrete casting of anchoring hole; 5. Main body of rock anchor beam; 6. Anchoring hole; 7. Auxiliary support arch; 71. Arched arch hole; 72. Support part; 721. Inclined surface; 722. Arc surface; 8. Equipment track; 9. Bearing surface. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be further described clearly and completely below in conjunction with the embodiments of this utility model. It should be noted that the described embodiments are only some embodiments of this utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0040] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] The terms “first,” “second,” “third,” and “fourth” are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, the use of “first,” “second,” “third,” and “fourth” to designate a feature may explicitly or implicitly include one or more of that feature.

[0042] Example 1

[0043] like Figures 1-4 As shown:

[0044] This embodiment proposes a rock anchor beam structure for an underground chamber, installed on the surrounding rock of the underground chamber. The structure includes a main rock anchor beam 5 and a connecting anchor assembly. The main rock anchor beam 5 is anchored and cast into the surrounding rock wall on the same side of the underground chamber via a first sub-assembly of the connecting anchor assembly. The first sub-assembly includes multiple first anchor rods / anchor cables 1, and the second sub-assembly of the connecting anchor assembly includes multiple second anchor rods / anchor cables 2. Multiple anchoring holes 6 are spaced apart on the surrounding rock wall on the same side of the underground chamber. The underground chamber rock anchor beam structure also includes multiple anchors... The concrete casting component 4 for the anchoring hole is cast through a corresponding anchoring hole 6. The anchoring hole 6 serves as the casting mold for the concrete casting component 4. After casting, the concrete casting component 4 is embedded in the anchoring hole 6. The main body of the rock anchor beam 5 is cast integrally with multiple concrete casting components 4 in multiple anchoring holes / cast in stages. The main body of the rock anchor beam 5 is fixed to the surrounding rock wall on the same side of the underground chamber through the embedded bearing effect of multiple concrete casting components 4 in multiple anchoring holes and the anchoring effect of the second anchor rod / anchor cable 2.

[0045] The rock anchor beam body 5 is used to support an equipment track 8 installed on the rock anchor beam body 5; specifically, the equipment track 8 is used for the movement of the overhead crane.

[0046] The concrete casting component 4 of the anchoring hole serves as a tenon structure between the rock anchor beam body 5 and the surrounding rock of the underground chamber, as well as a load-bearing component of the rock anchor beam body 5. It is also used to strengthen the connection between the rock anchor beam body 5 and the surrounding rock of the underground chamber.

[0047] The first anchor bolt / anchor cable 1 serves as a connecting anchor for anchoring the rock wall of the anchoring hole 6, and is also used to anchor the concrete casting 4 of the anchoring hole to the rock wall of the anchoring hole 6.

[0048] The second anchor bolt / anchor cable 2 serves as a connecting anchor for anchoring the load-bearing rock wall area of ​​the surrounding rock on the same side of the underground chamber, and is also used to anchor the rock anchor beam body 5 to the surrounding rock wall on the same side of the underground chamber.

[0049] As an optional optimized implementation, the connection between the concrete casting 4 of the anchoring hole 6, which is formed by in-situ casting and curing, and the surrounding rock of the inner wall of the anchoring hole 6 is specifically achieved by using anchor rods or anchor cables.

[0050] As an optional optimized implementation, the weight of the rock anchor beam body 5 is borne by the contact load-bearing rock wall area of ​​the surrounding rock of the underground chamber and the anchoring tunnel 6.

[0051] Specifically, the concrete casting component 4 of the anchoring hole is cast through the anchoring hole 6.

[0052] Ideally, the underground chamber is specifically a rock underground chamber.

[0053] Ideally, the rock wall of the anchored tunnel 6 is anchored through the first sub-assembly (i.e., connected by anchor rods or anchor cables), and the contact load-bearing rock wall area of ​​the surrounding rock of the underground chamber is anchored through the second sub-assembly (i.e., connected by anchor rods or anchor cables).

[0054] As an optional optimized implementation, the rock anchor beam body 5 is a cast-in-place reinforced concrete rectangular continuous beam. This cast-in-place reinforced concrete rectangular continuous beam can continuously cross multiple adverse geological layers through the anchoring holes 6 that serve as beam end supports, and can strengthen the support of adverse geological layers.

[0055] As another optional optimized implementation, each anchoring hole 6 is excavated from the surrounding rock wall on one side of the underground chamber and is distributed in a horizontal straight line.

[0056] As an optional optimized implementation, in a virtual spatial coordinate system with the length direction of the rock anchor beam 5 as the horizontal axis, the cross-sectional structure of the anchoring hole concrete casting 4 on the XZ virtual section of the virtual spatial coordinate system is arch-shaped; the lower part of the anchoring hole concrete casting 4 is cubic; and the projection structure of the anchoring hole concrete casting 4 in the top view is rectangular. Thus, when the spacing of the anchoring holes 6 is large, making the anchoring hole concrete casting 4 into an arch shape can effectively improve the structural stress conditions and save engineering work.

[0057] Example 2

[0058] Example 2 is an optimized design of any of the technical solutions proposed in Example 1;

[0059] like Figures 1-6 As shown:

[0060] The underground cavern rock anchor beam structure also includes an auxiliary support arch 7 located below the rock anchor beam body 5 to assist in supporting the rock anchor beam body 5; the auxiliary support arch 7 is provided with multiple downward-facing arc-shaped arch holes 71 at intervals, and the part of the auxiliary support arch 7 located between two adjacent arc-shaped arch holes 71 is a support part 72, and each support part 72 is combined to support the vertical load of the rock anchor beam body 5.

[0061] In a practical application scenario, specifically, the height of the rock anchor beam body 5 (i.e. Figure 1 The Z-axis height is 1.5m-2m; the length of the concrete casting component 4 of the anchoring hole (i.e., Figure 2 The Y-axis length is 3m-5m, and the spacing between two adjacent anchorage hole concrete castings 4 is (i.e., Figure 1 The X-direction distance is 8m-15m.

[0062] Ideally, the main body 5 of the rock anchor beam and the auxiliary support arch 7 are integrally cast / phased integrally cast, and the support part 72 is integrally cast / phased integrally cast with the concrete casting part 4 of the anchor hole in a one-to-one correspondence.

[0063] Ideally, in a virtual spatial coordinate system with the length direction of the rock anchor beam 5 as the transverse direction, a longitudinal structural projection of the anchoring hole concrete casting 4 (specifically, the longitudinal structural projection of the surrounding rock wall facing away from the nearest side) corresponds one-to-one with a side of the supporting part 72 (such as...). Figure 1 As shown, this side (specifically the rear side) is overlapped.

[0064] Optimally, the third sub-assembly of the connecting anchor assembly includes multiple third anchor rods / anchor cables 3. The contact load-bearing rock wall area of ​​one side of the underground chamber's surrounding rock wall is anchored to the auxiliary support arch 7 through the third sub-assembly. Specifically, the first part of the contact load-bearing rock wall area is the area where the auxiliary support arch 7 contacts the surrounding rock wall of one side of the underground chamber, and the second part of the contact load-bearing rock wall area is the area where the rock anchor beam body 5 contacts the surrounding rock wall of one side of the underground chamber. The longitudinal structural projection of the anchoring hole concrete casting towards the support is not within the range of the first part of the contact load-bearing rock wall area.

[0065] Specifically, the connecting anchor assembly includes a first sub-assembly, a second sub-assembly, and a third sub-assembly.

[0066] Ideally, the side of the support 72 away from the concrete casting part 4 of the anchor hole is a slope 721. The slope 721 forms an acute angle with the XZ virtual plane of the virtual space coordinate system, and the angle opens upward. Specifically, the slope 721 can further reduce the structural size, save the amount of work, and also take into account the aesthetics.

[0067] Ideally, a load-bearing structural platform is excavated from one side of the surrounding rock wall of the underground chamber. The cross-sectional structure of this load-bearing structural platform is U-shaped or has a vertically folded, connected shape. The upper cross-sectional structure of the load-bearing structural platform is U-shaped. The upper load-bearing surface 9 of the load-bearing structural platform is used to support each support part 72. The bottom surface of each support part 72 is cast and solidified to connect with the upper load-bearing surface 9 of the cross-sectional structure (the load-bearing surface 9 is preferably a horizontal plane with a width of 0.5m, i.e., ...). Figure 5 The upper vertical surface of the bearing surface 9 (with its Y-direction width) has an anchoring hole 6 excavated in the direction away from the support part 72; this makes construction simpler and the support more reliable, and can replace the conventional rock platform straight and inclined section implementation scheme with high construction technical requirements and high construction difficulty.

[0068] Specifically, the gravity of the rock anchor beam body 5 is also borne by the contact bearing rock wall area of ​​the surrounding rock of the underground chamber, the bearing surface 9 of the upper part of the bearing structure platform, and the anchoring tunnel 6.

[0069] Ideally, the longitudinal structural projection of the support 72 onto the XZ virtual plane of the virtual space coordinate system is a trumpet shape, wider at the top and narrower at the bottom.

[0070] In a further optimized manner, one side line of the trumpet shape of one support 72 and one side line of the trumpet shape of the adjacent support 72 constitute the virtual arc of the longitudinal structural projection of the arc-shaped arch hole 71 onto the XZ virtual plane of the virtual space coordinate system.

[0071] In some preferred embodiments, the two curved surfaces 722 of the support 72 can be projected laterally onto the YZ virtual plane of the virtual space coordinate system; specifically, the support 72 utilizes the arch effect to improve the stress performance of the arch shape.

[0072] In some preferred embodiments, the first anchor bolt / anchor cable 1 may be an anchor bolt around the anchorage hole, an anchor bolt at the face of the anchorage hole, or an anchor cable.

[0073] In other preferred embodiments, generally, regardless of whether the surrounding rock conditions of the rock anchor beam body 5 within the construction range meet a certain standard, the connecting anchors of the rock anchor beam body 5 and the support part 72 can be anchor rods; when the underground plant sidewall is supported by anchor cables, the connecting anchors of the rock anchor beam body 5 and the support part 72 can be anchor cables; when the corresponding surrounding rock excavation location of the anchoring tunnel 6 is located in the Class I to III surrounding rock section, the first anchor rod / anchor cable 1 is an anchor rod; when the corresponding surrounding rock excavation location of the anchoring tunnel 6 is located in the Class IV to V surrounding rock section, the first anchor rod / anchor cable 1 is an anchor cable.

[0074] Further optimized, during the casting process, connecting steel bars are arranged between the concrete casting component 4 of the anchoring hole and the main body 5 of the rock anchor beam, and connecting steel bars are arranged between the concrete casting component 4 of the anchoring hole and the auxiliary support arch 7 during the casting process.

[0075] The construction process of the underground chamber rock anchor beam structure in this embodiment is as follows (the underground chamber is specifically an underground factory building):

[0076] The load-bearing structure platform was excavated using controlled blasting on the surrounding rock wall of the underground powerhouse;

[0077] The anchoring holes 6 are arranged at certain intervals and excavated using a combination of pre-splitting blasting and mechanical excavation, thereby reducing disturbance to the excavated sidewalls.

[0078] Each first anchor rod / anchor cable 1, each second anchor rod / anchor cable 2, and each third anchor rod / anchor cable 3 are anchored and installed at corresponding positions on the surrounding rock wall of the underground powerhouse;

[0079] Pour concrete into each anchorage hole 4 and reserve multiple pre-reserved steel bar anchorage joints facing the underground chamber (the pre-reserved steel bar anchorage joints are used to arrange connecting steel bars).

[0080] After waiting for a certain concrete curing age (preferably 7 days), the gap between the concrete casting 4 of the anchoring hole and the rock wall of the anchoring hole 6 is backfilled and grouted for curing.

[0081] Cast auxiliary support arch 7 and reserve multiple pre-reserved steel bar anchoring joints facing the main body 5 of the rock anchor beam;

[0082] After waiting for a certain concrete curing age (preferably 7 days), the main body of the rock anchor beam 5 is poured, so that the concrete pouring parts 4 of each anchoring hole, the pouring auxiliary support arch 7 and the main body of the rock anchor beam 5 form a whole.

[0083] After waiting for a certain period of concrete consolidation, the equipment track 8 is laid on the rock anchor beam body 5 along the length of the rock anchor beam body 5.

[0084] Example 3

[0085] like Figures 1-6 As shown:

[0086] This embodiment proposes an underground powerhouse using the underground chamber rock anchor beam structure described in either Embodiment 1 or Embodiment 2, comprising:

[0087] Two sets of underground chamber rock anchor beam structures respectively installed on the surrounding rock on both sides of the underground powerhouse; and

[0088] The overhead crane; the overhead crane moves the hoisting equipment in the underground plant through the equipment tracks 8 on the two sets of underground cavern rock anchor beam structures.

[0089] In some application scenarios, specifically, the underground powerhouse is a hydropower station underground powerhouse or a pumped storage power station underground powerhouse.

[0090] In specific application scenarios, the underground powerhouse in this embodiment also includes:

[0091] The underground powerhouse and its supporting building structure / mechanical and electrical equipment are located on the surrounding rock of the underground chamber.

[0092] The optional embodiments of this utility model also have the following advantages:

[0093] This utility model adopts an innovative structural force system, which realizes that the rock anchor beam structure of the underground powerhouse is simple, has strong adaptability to geological conditions, and is less difficult to construct. It can reduce the excavation span of the underground powerhouse and solve the technical problem that conventional rock anchor beam structures are strictly limited by geological conditions and construction level.

[0094] It has sufficient structural bearing capacity and ensures structural stability with a margin to match the surrounding rock.

[0095] Compared with conventional structures, this utility model has less stringent requirements for geological conditions. Only after the underground powerhouse is excavated, anchoring holes 6 need to be arranged at certain intervals. Rock anchor beams 5 and auxiliary support arches 7 can be implemented in other sections with poor geological conditions.

[0096] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A rock anchor beam structure for an underground chamber, disposed on the surrounding rock of an underground chamber, the rock anchor beam structure comprising a rock anchor beam body (5) and a combination of connecting anchors, characterized in that, The main body of the rock anchor beam (5) is anchored and cast to the surrounding rock wall on the same side of the underground chamber through the first sub-assembly of the connecting anchor assembly; the first sub-assembly includes multiple first anchor rods / anchor cables (1), the second sub-assembly of the connecting anchor assembly includes multiple second anchor rods / anchor cables (2), and multiple anchoring holes (6) are spaced apart on the surrounding rock wall on the same side of the underground chamber; the rock anchor beam structure of the underground chamber also includes multiple concrete castings (4) for anchoring holes; the concrete castings (4) for anchoring holes are connected through corresponding anchoring holes (6). The anchoring holes (6) are cast in a one-to-one correspondence as the casting molds for the anchoring hole concrete casting parts (4). The cast anchoring hole concrete casting parts (4) are embedded in the anchoring holes (6). The rock anchor beam body (5) is cast in an integral form with multiple anchoring hole concrete casting parts (4) in stages. The rock anchor beam body (5) is fixed on the surrounding rock wall on the same side of the underground chamber through the embedding and bearing effect of multiple anchoring hole concrete casting parts (4) and the anchoring effect of the second anchor rod / anchor cable (2). The rock anchor beam body (5) is used to support an equipment track (8) installed on the rock anchor beam body (5); The concrete casting component (4) of the anchoring hole serves as a tenon structure between the rock anchor beam body (5) and the surrounding rock of the underground chamber, as well as a load-bearing component of the rock anchor beam body (5), and is also used to strengthen the connection between the rock anchor beam body (5) and the surrounding rock of the underground chamber. The first anchor rod / anchor cable (1) serves as a connecting anchor for anchoring the rock wall of the anchoring hole (6), and is also used to anchor the concrete casting (4) of the anchoring hole to the rock wall of the anchoring hole (6). The second anchor rod / anchor cable (2) serves as a connecting anchor for the contact load-bearing rock wall area of ​​the surrounding rock on the same side of the underground chamber, and is also used to anchor the rock anchor beam body (5) to the surrounding rock wall on the same side of the underground chamber.

2. The underground cavern rock anchor beam structure according to claim 1, characterized in that, The main body of the rock anchor beam (5) is a cast-in-place reinforced concrete rectangular continuous beam.

3. The underground cavern rock anchor beam structure according to claim 1, characterized in that, Each anchorage hole (6) was excavated on the surrounding rock wall on one side of the underground chamber and is distributed in a horizontal straight line.

4. The underground chamber rock anchor beam structure according to any one of claims 1-3, characterized in that, The underground cavern rock anchor beam structure also includes an auxiliary support arch (7) located below the rock anchor beam body (5) for assisting in supporting the rock anchor beam body (5); the auxiliary support arch (7) is provided with multiple downward-facing arc-shaped arch holes (71) at intervals, and the part of the auxiliary support arch (7) located between two adjacent arc-shaped arch holes (71) is a support part (72), and each support part (72) is combined to support the vertical load of the rock anchor beam body (5); The main body (5) of the rock anchor beam and the auxiliary support arch (7) are cast in one piece / cast in stages. The support part (72) is cast in one piece / cast in stages with the concrete casting part (4) of the anchor hole.

5. The underground chamber rock anchor beam structure according to claim 4, characterized in that, In a virtual spatial coordinate system with the length direction of the rock anchor beam (5) as the transverse direction, the longitudinal structural projection of the anchor hole concrete casting (4) overlaps with the side of the corresponding support part (72).

6. The underground chamber rock anchor beam structure according to claim 5, characterized in that, The third sub-assembly of the connecting anchor assembly includes multiple third anchor rods / anchor cables (3), and the contact load-bearing rock wall area of ​​one side of the underground chamber is anchored to the auxiliary support arch (7) through the third sub-assembly.

7. The underground cavern rock anchor beam structure according to claim 6, characterized in that, The side of the support (72) away from the concrete casting part (4) of the anchor hole is an inclined surface (721), and the angle between the inclined surface (721) and the XZ virtual plane of the virtual space coordinate system is an acute angle, and the angle opens upward.

8. The underground chamber rock anchor beam structure according to claim 6, characterized in that, A load-bearing structure platform is excavated on one side of the surrounding rock wall of the underground chamber. The cross-sectional structure of the load-bearing structure platform is shaped like a ㄣ or a vertical stroke connected by two vertical strokes. The upper cross-sectional structure of the load-bearing structure platform is shaped like a 㠃�. The upper load-bearing surface (9) of the load-bearing structure platform is used to support each support part (72). The bottom surface of each support part (72) is cast and solidified to connect with the upper load-bearing surface (9) of the load-bearing structure platform. Anchoring holes (6) are excavated on the upper vertical surface of the load-bearing structure platform in the direction away from the support part (72). The longitudinal structural projection of the support part (72) onto the XZ virtual plane of the virtual space coordinate system is a trumpet shape with a larger top and a smaller bottom.

9. An underground powerhouse employing the underground chamber rock anchor beam structure as described in any one of claims 1-8, characterized in that, include: The two sets of underground chamber rock anchor beam structures are respectively set on the surrounding rock on both sides of the underground powerhouse; The overhead crane; the overhead crane moves the hoisting equipment in the underground plant through the equipment tracks (8) on the two sets of underground cavern rock anchor beam structures.

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