Inverted arch precast block, inverted arch precast block assembly and mounting method

Abstract

The invention discloses an inverted arch precast block, an inverted arch precast block assembly and a mounting method, and belongs to the technical field of inverted arch precast blocks, the inverted arch precast block assembly comprises an inverted arch precast block body, a bolt through hole is formed in the splicing surface of the inverted arch precast block body, a mounting groove is formed in the top surface of the inverted arch precast block body, and the mounting groove communicates with the bolt through hole; the assembly comprises arc-shaped bolts, nuts and inverted arch precast blocks, the arc-shaped bolts are used for penetrating through the mounting grooves and the bolt through holes of the two adjacent inverted arch precast blocks, and the nuts are used for being in threaded connection with the connecting ends of the arc-shaped bolts. The mounting method comprises the steps that S1, every two adjacent inverted arch precast block bodies are placed in an attached mode; s2, the bolt through holes of every two adjacent inverted arch precast block bodies are connected through arc-shaped bolts; and S3, the mounting groove of the inverted arch precast block body is filled. When the adjacent inverted arch precast blocks are connected through the arc-shaped bolts, no welding step and no hoisting step exist, the installation process is simplified, the installation speed is increased, the problem that deviation is prone to occurring in hoisting and positioning is solved, and the installation quality is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of inverted arch prefabricated blocks, and in particular to an inverted arch prefabricated block, an inverted arch prefabricated block assembly and an installation method. Background Art

[0002] During TBM tunnel construction, precast inverted arch blocks serve as platforms for the TBM's rear trolleys and also provide tunnel sealing and looping. Arranged within the tunnel, these blocks consist of multiple independent units. To increase their bearing capacity, they need to be connected as a single unit. Currently, these blocks are secured using a steel plate connection box and bolts. The box is inserted into the gap between the mating surfaces of two adjacent blocks and secured to the mating surfaces with bolts. However, the longitudinal joints within the box are difficult to weld and are prone to fracture when subjected to longitudinal forces. Furthermore, the box requires frequent hoisting during installation, posing significant safety risks. Furthermore, positioning errors during hoisting can affect the quality of the longitudinal connections of the blocks.

[0003] Therefore, there is an urgent need for an installation solution for the inverted arch prefabricated blocks with simple installation steps and high installation quality. Summary of the Invention

[0004] The object of the present invention is to solve the above-mentioned technical problems and provide an inverted arch prefabricated block, an inverted arch prefabricated block assembly and an installation method. Bolt through holes are provided on the assembly surface of the inverted arch prefabricated block body, and mounting grooves are provided on the top surface of the inverted arch prefabricated block body. An arc-shaped bolt can be passed through the bolt through holes of two adjacent inverted arch prefabricated block bodies through the mounting groove of one inverted arch prefabricated block body, and then the nut of the arc-shaped bolt is screwed on through the mounting groove of the other inverted arch prefabricated block body. When the two adjacent inverted arch prefabricated block bodies are connected into a whole, the entire process does not require welding steps or hoisting steps, thereby simplifying the installation process, improving the installation speed, eliminating the problem of easy deviation in hoisting positioning, and ensuring the installation quality.

[0005] To achieve the above-mentioned purpose, the present invention provides the following solution: The present invention discloses an inverted arch prefabricated block, comprising an inverted arch prefabricated block body, wherein the assembly surface of the inverted arch prefabricated block body is provided with a bolt through hole, and the top surface of the inverted arch prefabricated block body is provided with an installation groove, wherein the installation groove is connected to the bolt through hole, and the bolt through hole is an arc-shaped through hole.

[0006] Preferably, the depth of the mounting groove gradually decreases from one end close to the bolt through hole to the end far away from the bolt through hole, and the width of the mounting groove gradually decreases.

[0007] Preferably, the bottom of the mounting groove is an arc-shaped bottom.

[0008] Preferably, a sleeve is provided on the inner wall of the bolt through hole.

[0009] Preferably, steel bars are spirally wound around the outer side of the sleeve along the axial extension direction of the sleeve, and the steel bars are embedded in the main body of the inverted arch prefabricated block.

[0010] Preferably, the steel bars are fixedly connected to the main bars of the inverted arch prefabricated block body.

[0011] The present invention also discloses an inverted arch prefabricated block assembly, comprising an arc-shaped bolt, a nut and the above-mentioned inverted arch prefabricated block, wherein the arc-shaped bolt is used to pass through the mounting groove and bolt through hole of two adjacent inverted arch prefabricated blocks, and the nut is used to be threadedly connected to the connecting end of the arc-shaped bolt.

[0012] Preferably, an elastic washer is further included, and the elastic washer is located between the side wall of the mounting groove connected to the bolt through hole and the nut.

[0013] The present invention also discloses a method for installing an inverted arch prefabricated block, comprising the following steps:

[0014] S1, placing the assembly surfaces of two adjacent inverted arch prefabricated blocks in contact with each other so that the bolt through holes of the two adjacent inverted arch prefabricated blocks are in communication with each other;

[0015] S2, connecting the bolt through holes of two adjacent inverted arch prefabricated blocks with arc bolts;

[0016] S3, filling the installation groove of the inverted arch prefabricated block body.

[0017] Compared with the prior art, the present invention has achieved the following technical effects:

[0018] The present invention provides bolt through holes on the assembling surfaces of the inverted arch prefabricated block bodies, and provides mounting grooves on the top surfaces of the inverted arch prefabricated block bodies that are connected to the bolt through holes. An arc-shaped bolt can be passed through the bolt through holes of two adjacent inverted arch prefabricated block bodies through the mounting groove of one of the inverted arch prefabricated block bodies, and then the nut of the arc-shaped bolt can be screwed on through the mounting groove of the other inverted arch prefabricated block body. When the two adjacent inverted arch prefabricated block bodies are connected into a whole, the entire process does not require welding or hoisting steps, thereby simplifying the installation process, eliminating the problem of easy deviation in hoisting positioning, and improving the installation speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the analysis of these drawings without paying any creative work.

[0020] Figure 1 Schematic diagram of the three-dimensional structure of the inverted arch prefabricated block in an embodiment of the present invention;

[0021] Figure 2 This is a front view structural diagram of an inverted arch prefabricated block according to an embodiment of the present invention;

[0022] Figure 3 Schematic diagram of the top view of the inverted arch prefabricated block in an embodiment of the present invention;

[0023] Figure 4 Schematic diagram of the three-dimensional perspective structure of the inverted arch prefabricated block in an embodiment of the present invention;

[0024] Figure 5 Schematic diagram of the front perspective structure of the inverted arch prefabricated block in an embodiment of the present invention;

[0025] Figure 6 Schematic diagram of the perspective structure of the inverted arch prefabricated block in an embodiment of the present invention from a top view;

[0026] Figure 7 This is a side perspective structural diagram of an inverted arch prefabricated block according to an embodiment of the present invention;

[0027] Figure 8 for Figure 4 Schematic diagram of a local enlarged structure;

[0028] Figure 9 for Figure 7 Schematic diagram of a local enlarged structure;

[0029] Figure 10 Schematic diagram of the structure of the arc bolt in an embodiment of the present invention;

[0030] Figure 11 Schematic diagram of the structure of the sleeve in an embodiment of the present invention;

[0031] Figure 12 A top view showing the positional relationship between the bolt through hole and the mounting slot in an embodiment of the present invention;

[0032] Figure 13 A front view showing the positional relationship between the arc-shaped through hole and the mounting groove in an embodiment of the present invention;

[0033] Figure 14 This is a schematic structural diagram of two adjacent inverted arch prefabricated blocks assembled in an embodiment of the present invention;

[0034] Figure 15 for Figure 14 Schematic diagram of the local enlarged structure.

[0035] Explanation of the accompanying reference numerals: 1. Inverted arch prefabricated block body; 11. Hollow hole; 12. Bolt through hole; 13. Mounting groove; 2. Steel bar; 3. Arc-shaped bolt; 31. Nut; 32. Nut cap; 33. Elastic washer; 4. Sleeve; 41. Trumpet-shaped rubber mouth. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments analyzed and obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] The object of the present invention is to provide an inverted arch prefabricated block, an inverted arch prefabricated block assembly and an installation method to solve the problems existing in the prior art: two adjacent inverted arch prefabricated block bodies can be locked together by arc-shaped bolts through bolt through holes and installation grooves, thereby realizing the assembly of the inverted arch prefabricated block bodies. The entire process does not require welding steps or hoisting steps, thereby solving the problems of difficulty in welding the internal longitudinal connections of steel plate connection boxes, easy fracture of the connections of the steel plate connection boxes when subjected to longitudinal force, hidden dangers in hoisting the steel plate connection boxes and easy deviation in hoisting, which affect the quality of the longitudinal connections of the inverted arch prefabricated blocks in the later stage.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1:

[0040] like Figures 1 to 15As shown, this embodiment discloses an inverted arch prefabricated block, comprising an inverted arch prefabricated block body 1. The inverted arch prefabricated block body 1 has an arched structure, a flat top surface, an arcuate bottom surface, and two flat end surfaces in the depth direction of the inverted arch prefabricated block body 1, serving as assembly surfaces for the inverted arch prefabricated block body 1. Bolt holes 12 are provided on both assembly surfaces of the inverted arch prefabricated block body 1, extending from the assembly surfaces in the depth direction. The number and position of the bolt holes 12 on the two assembly surfaces correspond, and the number and diameter of the bolt holes 12 are set based on the actual connection strength requirements. For example, two or more bolt holes 12 are provided on each assembly surface, and the diameter of the bolt holes 12 is set to 39 mm. A mounting groove 13 is provided on the top surface of the inverted arch prefabricated block body 1, communicating with the bolt holes 12. The bolt holes 12 are arcuate, and the corresponding bolts are arcuate bolts 3. When the arc-shaped bolt 3 passes through the mounting groove 13 into the bolt through hole 12, the arc-shaped bolt through hole 12 can facilitate the arc-shaped bolt 3 to pass out from the mounting groove 13 of the other inverted arch prefabricated block body 1. The arc-shaped bolt through hole 12 can ensure that the path of the arc-shaped arc-shaped bolt 3 is smooth, making it easy for the arc-shaped arc-shaped bolt 3 to pass through.

[0041] How it works:

[0042] First, the assembly surfaces of two adjacent inverted arch prefabricated block bodies 1 are placed together so that the bolt through holes 12 of the two adjacent inverted arch prefabricated block bodies 1 are aligned and connected;

[0043] Then, the arc-shaped bolt 3 is inserted from the mounting groove 13 of one of the inverted arch prefabricated block bodies 1, passes through the bolt through-holes 12 of the two inverted arch prefabricated block bodies 1, and exits from the mounting groove 13 of the other inverted arch prefabricated block body 1. The nut 31 is tightened to the connecting end of the arc-shaped bolt 3 through the mounting groove 13 to lock the two adjacent inverted arch prefabricated block bodies 1. Thus, the installation of the two adjacent inverted arch prefabricated block bodies 1 is completed.

[0044] Finally, the installation grooves 13 are filled with filler, completing the installation of the two adjacent inverted arch prefabricated block bodies 1. The filler is typically made of rapid-hardening mortar or concrete with a strength equal to or greater than that of the inverted arch prefabricated block body 1. For example, if the inverted arch prefabricated block body 1 is made of C40 concrete, then C40 concrete can be used as the filler. Before filling, remove any debris from the hole and moisten the hole walls. After filling, smooth the surface and cover with film for 24 hours of curing.

[0045] In one embodiment, the mounting groove 13 is a groove with a gradually shallower depth. Specifically, the mounting groove 13 gradually becomes shallower from the end near the bolt hole 12 to the end away from the bolt hole 12. This configuration, on the one hand, provides a deeper end near the bolt hole 12, making it easier to screw the nut 31 onto the curved bolt 3. On the other hand, the groove gradually becomes shallower toward the end away from the bolt hole 12, which facilitates filling the mounting groove 13 smoothly and saving filling material. The width of the mounting groove 13 gradually decreases. Specifically, the mounting groove 13 gradually becomes narrower from the end near the bolt hole 12 to the end away from the bolt hole 12. The end near the bolt hole 12 is the wider end, making it easier to screw the nut 31 onto the curved bolt 3. The mounting groove 13 gradually becomes narrower toward the end away from the bolt hole 12, which facilitates filling the mounting groove 13 smoothly and saving filling material. The mounting groove 13 is generally similar to a triangular wedge shape.

[0046] In one embodiment, the bottom of the mounting groove 13 is an arc-shaped bottom. Since the cross section of the arc-shaped bolt 3 is circular, the arc-shaped bottom facilitates the insertion of the arc-shaped bolt 3.

[0047] In one embodiment, the groove wall of one end of the installation groove 13 connected to the bolt through hole 12 is larger than the aperture of the bolt through hole 12 , so that the nut 31 or the nut 32 fits on the groove wall of the installation groove 13 .

[0048] In one embodiment, the mounting groove 13 is produced by setting the mounting groove mold in advance at a preset position before casting the inverted arch prefabricated block body 1, applying mold release oil on the mold surface, and then connecting the mounting groove mold for casting together. The mold is then removed after the inverted arch prefabricated block body 1 is formed and demolded. The mold is made of steel, and it is recommended to use high-strength steel. The size of the mounting groove mold is set according to actual conditions, such as a triangular wedge-shaped mold of 170.29mm*109.56mm*83.88mm, thereby forming a triangular wedge-shaped mounting groove 13 of 170.29mm in length, 109.56mm in width, and 83.88mm in depth on the inverted arch prefabricated block body 1. The triangular wedge-shaped mounting groove 13 has the characteristics of gradually shallowing the groove depth, gradually decreasing the groove width, and having an arc-shaped groove bottom.

[0049] In one embodiment, four bolt through holes 12 are provided on the main body 1 of a single inverted arch prefabricated block, and two bolt through holes 12 are provided on each assembly surface.

[0050] In one embodiment, the groove wall at one end of the mounting groove 13 connected to the bolt through hole 12 is tilted, and the tilt angle needs to ensure that the fitting surface of the nut 31 (nut 32) and the groove wall of the mounting groove 13 are completely fitted with the groove wall of the mounting groove 13.

[0051] In one embodiment, the bolt holes 12 are formed by sleeves 4 embedded in the inverted arch prefabricated block body 1. Specifically, before casting the inverted arch prefabricated block body 1, the sleeves 4 are placed at predetermined locations, both ends of the sleeves 4 are sealed, and then the inverted arch prefabricated block body 1 is cast. Once the inverted arch prefabricated block body 1 is formed, the bolt holes 12 are formed in the inverted arch prefabricated block body 1. Preferably, the sleeves 4 are PVC tubes, with a desired wall thickness, such as 3 mm.

[0052] In one embodiment, the two pipe openings of the sleeve 4 are provided with trumpet-shaped rubber openings 41 , and the trumpet-shaped structure facilitates the insertion and removal of the arc-shaped bolt 3 .

[0053] In one embodiment, when pouring and vibrating the inverted arch prefabricated block body 1, it is necessary to avoid the area where the installation groove mold and the sleeve 4 are located. After demoulding, the installation groove mold is removed, and the sleeve 4 can be retained. The flatness of the inner wall of the installation groove 13 should be within the qualified range (allowable deviation ≤ 2mm), and the straightness error of the axis of the bolt through hole 12 should be ≤ 1%.

[0054] In one embodiment, the outer side of the sleeve 4 is helically wound with steel bars 2 along the axis of the sleeve 4. The diameter of the steel bars 2 can be adjusted as needed. Generally, a steel bar 2 with a diameter of 10 mm can be used, with a pitch of 40 mm and a winding angle of 20°-40°, wound around the outer side of the sleeve 4. The steel bars 2 wound around the outer side of the sleeve 4 can compensate for the strength lost in the concrete structure.

[0055] In one embodiment, in order to ensure that the position of the steel bars 2 does not shift during the concrete pouring process, the steel bars 2 are fixedly connected to the main bars of the inverted arch prefabricated block body 1 .

[0056] In one embodiment, hollow holes 11 are provided on the inverted arch prefabricated block body 1, which can reduce the overall weight of the inverted arch prefabricated block body 1 and achieve lightweighting.

[0057] Example 2:

[0058] like Figures 1 to 15 As shown, this embodiment discloses an inverted arch prefabricated block assembly, comprising a curved bolt 3, a nut 31, and an inverted arch prefabricated block body 1. The curved bolt 3 passes through the mounting slot 13 and the bolt through-hole 12 (curved through-hole) to connect adjacent inverted arch prefabricated block bodies 1 into a single unit. After the curved bolt 3 is installed, the nut 31 is threadedly engaged with the connecting end of the curved bolt 3 to prevent the curved bolt 3 from falling out of the bolt through-hole 12.

[0059] In one embodiment, the curved bolt 3 is made of M27 high-strength alloy steel curved bolt (grade 8.8) and its matching nut 31 (the curved bolt 3 can be a double-nut curved bolt with nuts 31 screwed into both ends, or a single-nut curved bolt with nut 31 screwed into one end and a nut 32 attached to the other end). The length is selected or manufactured according to actual conditions, and the surfaces of the curved bolt 3 and nut 31 are galvanized. For example, the length of the curved bolt 3 can be 516.1 mm.

[0060] In one embodiment, an elastic washer 33 is further included. The elastic washer 33 is first inserted through the arc bolt 3 and then the arc bolt 3 is inserted into the mounting groove 13. After the arc bolt 3 is inserted, another elastic washer 33 is inserted on the arc bolt 3. Finally, a nut 31 is threadedly connected to the arc bolt 3 so that the nut 31 is pressed against the elastic washer 33 to reduce the friction between the nut 31 and the arc bolt 3 on the concrete.

[0061] In one embodiment, the arc bolt 3, nut 31, and elastic washer 33 are all subjected to a corrosion protection treatment by hot-dip galvanizing before use. It is recommended that the arc bolt 3 be hot-dip galvanized to a thickness of at least 0.07 mm, the nut 31 be hot-dip galvanized to a thickness of at least 0.05 mm, and the elastic washer 33 be electro-galvanized to a thickness of at least 0.07 mm.

[0062] Example 3:

[0063] like Figures 1 to 15 As shown, this embodiment provides a method for installing an inverted arch prefabricated block, comprising the following steps:

[0064] S1, placing the assembly surfaces of two adjacent inverted arch prefabricated block bodies 1 of Example 1 in contact with each other so that the bolt through holes 12 of the two adjacent inverted arch prefabricated block bodies 1 are in communication;

[0065] S2. Connect the bolt through holes 12 of the two adjacent inverted arch prefabricated block bodies 1 with the arc-shaped bolts 3. Specifically, the arc-shaped bolts 3 are inserted through the mounting grooves 13, pass through the bolt through holes 12, and then exit from the mounting groove 13 of the other inverted arch prefabricated block body 1. The nuts 31 are then threadedly connected to the connecting ends of the arc-shaped bolts 3.

[0066] S3, the mounting groove 13 of the inverted arch prefabricated block body 1 is filled, specifically, the filling of the mounting groove 13 should adopt rapid hardening mortar or strength concrete greater than or equal to the inverted arch prefabricated block body 1 (if the inverted arch prefabricated block body 1 adopts C40 concrete pouring, C40 concrete filling can be adopted during filling), before filling, the hole is cleaned of debris and the hole wall is moistened, the surface is smoothed after filling, and covered with a film and cured for 24 hours.

[0067] In one embodiment, step S4 is further included, and the remaining inverted arch prefabricated block bodies 1 can be installed with reference to steps S1-S3.

[0068] In one embodiment, a single-nut arc bolt 3 is used, i.e., one end of the arc bolt 3 is a nut 32, and the other end is screwed into a nut 31, or a double-nut arc bolt 3 is used, with both ends of the arc bolt 3 being screwed into nuts 31. In step S2, for the single-nut arc bolt 3: an elastic washer 33 is first sleeved on the arc bolt 3, then the arc bolt 3 passes through the bolt through-holes 12 of the two inverted arch prefabricated block bodies 1, and then the elastic washer 33 is sleeved on the arc bolt 3, and the nut 31 is screwed on. The nut 31 presses the elastic washer 33 against the side wall of the mounting groove 13 of one inverted arch prefabricated block body 1, and the nut 32 presses the elastic washer 33 against the side wall of the mounting groove 13 of the other inverted arch prefabricated block body 1. Double-nut curved bolt 3: An elastic washer 33 is first sleeved on the curved bolt 3, and then the curved bolt 3 passes through the bolt through-holes 12 of the two inverted arch prefabricated block bodies 1. Then, the elastic washer 33 is sleeved on the curved bolt 3, and two nuts 31 are screwed on. The nut 31 presses the elastic washer 33 against the side wall of the mounting groove 13 of one of the inverted arch prefabricated block bodies 1, and the other nut 31 presses the elastic washer 33 against the side wall of the mounting groove 13 of the other inverted arch prefabricated block body 1.

[0069] In one embodiment, an electric torque wrench can be used to tighten the nut 31 in two steps (the preset torque value is 360 N·m, the initial pre-tightening is to 180 N·m, and the secondary final tightening is to 360 N·m). When tightening the nut 31, an angle sensor is provided to monitor the tightening angle in real time (it is required to be tightened to 120°±5°).

[0070] Compared with the traditional steel plate connection box + connecting arc bolt method, this invention has the following advantages:

[0071] ① Improve construction efficiency: By designing the reserved installation groove 13, the bolt through hole 12 and the arc-shaped bolt 3, the alignment and tightening process is simplified, the installation time of a single block is greatly shortened, and the tunnel construction period is reduced.

[0072] ② Reduce manufacturing costs: Eliminate the need for traditional embedded steel plate connection boxes, reduce the difficulty of prefabricated block mold processing, and reduce the number of arc bolts installed from the traditional 24 arc bolts to four arc bolts.

[0073] ③ Enhance connection reliability: Utilize the synergistic force mechanism of concrete and arc bolts to optimize stress distribution, improve shear and tensile properties, and avoid the problem of stress concentration on the steel plate causing deformation in traditional connections.

[0074] ④ Simplify the prefabrication process: Through the design of standardized bolt holes and installation slots, rapid prototyping of prefabricated blocks in batches can be achieved, reducing dependence on the technical level of on-site construction personnel.

[0075] ⑤ Adapt to complex working conditions: Through the flexible adjustment capability of the arc bolts, it is compatible with the gradual assembly requirements of curved tunnel sections and allows for later fine-tuning, thereby improving engineering adaptability.

[0076] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0077] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. An inverted arch prefabricated block, characterized by: The inverted arch prefabricated block body comprises an inverted arch prefabricated block body, the assembly surface of the inverted arch prefabricated block body is provided with a bolt through hole, the top surface of the inverted arch prefabricated block body is provided with a mounting groove, the mounting groove is connected with the bolt through hole, and the bolt through hole is an arc-shaped through hole.

2. The inverted arch prefabricated block according to claim 1, characterized in that: The depth of the mounting groove gradually decreases from one end close to the bolt through hole to the end far away from the bolt through hole, and the width of the mounting groove gradually decreases.

3. The inverted arch prefabricated block according to claim 2, characterized in that: The bottom of the installation groove is an arc-shaped bottom.

4. The inverted arch prefabricated block according to claim 1, characterized in that: The bolt through hole is formed by a sleeve embedded in the body of the inverted arch prefabricated block.

5. The inverted arch prefabricated block according to claim 4, characterized in that: Steel bars are spirally wound around the outer side of the sleeve along the axial extension direction of the sleeve, and the steel bars are embedded in the main body of the inverted arch prefabricated block.

6. The inverted arch prefabricated block according to claim 5, characterized in that: The steel bars are fixedly connected to the main bars of the inverted arch prefabricated block body.

7. An inverted arch prefabricated block assembly, characterized by: It comprises an arc-shaped bolt, a nut and the inverted arch prefabricated block according to any one of claims 1 to 6, wherein the arc-shaped bolt is used to pass through the mounting slots and bolt through holes of two adjacent inverted arch prefabricated blocks, and the nut is used to be threadedly connected to the connecting end of the arc-shaped bolt.

8. The inverted arch prefabricated block assembly according to claim 7, characterized in that : Also includes an elastic washer, which is located between the side wall connecting the mounting groove and the bolt through hole and the nut.

9. A method for installing an inverted arch prefabricated block, characterized in that: The following steps are involved: S1. Place the assembly surfaces of two adjacent inverted arch prefabricated blocks according to any one of claims 1 to 8 in abutment with each other so that the bolt through holes of the two adjacent inverted arch prefabricated blocks communicate with each other; S2, connecting the bolt through holes of two adjacent inverted arch prefabricated blocks with arc bolts; S3, filling the installation groove of the inverted arch prefabricated block body.

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