Synchronous and efficient tensioning method for prefabricated inverted arch blocks of TBM tunneling tunnel

Abstract

The invention discloses a TBM tunneling tunnel prefabricated inverted arch block synchronous efficient tensioning method which comprises the steps that S1, a first prefabricated inverted arch block is transported into a tunnel, an upper tensioning seat is installed above the first prefabricated inverted arch block, and a lower tensioning plate is installed at the lower end of the first prefabricated inverted arch block; s2, a second prefabricated inverted arch block is transported into the tunnel, an upper tensioning seat is installed above the second prefabricated inverted arch block, and a lower tensioning plate is installed at the lower end of the second prefabricated inverted arch block; s3, one upper tensioning screw rod penetrates through the upper tensioning seat on the same side, and an upper tensioning jack is installed between an upper tensioning nut located at the second end of the upper tensioning screw rod and the upper tensioning seat of the second prefabricated inverted arch block; s4, a lower tensioning screw penetrates through the corresponding lower tensioning plate on the same side, and a lower tensioning jack is installed between a lower tensioning nut at the second end of the lower tensioning screw and the second prefabricated inverted arch block; and S5, the upper tensioning jack and the lower tensioning jack are controlled to stretch out. The adjacent prefabricated inverted arch blocks can be evenly stressed, and gaps are even.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated invert block installation, in particular to a synchronous and efficient tightening method for a prefabricated invert block in a TBM tunneling tunnel. Background Art

[0002] After the TBM excavation and steel mesh spraying concrete initial support of the existing tunnel, the invert arch needs to be spliced ​​on site using prefabricated invert arch blocks. Figure 1 As shown, the whole is a semicircular reinforced concrete structure with a centerline length of 2m (in the tunnel excavation direction), a width of 7.91m, and a height of 2.65m. There are three holes inside, the middle prefabricated hole is 2.6m wide, and the shoulders on both sides are open holes with a width of 1.36m.

[0003] In the application of the prior art, a set of bridge cranes and matching transport vehicles are designed and manufactured according to the installation requirements of the prefabricated inverted arch blocks and the actual conditions on site, which are mainly used for the transportation and installation of the prefabricated inverted arch blocks. Before installing the prefabricated inverted arch blocks, it is necessary to remove the slag in the passage and lay a waterproof layer. After the prefabricated inverted arch blocks are installed, it is necessary to grout the gap between the prefabricated inverted arch blocks and the cave wall, and finally install the cover plate of the prefabricated inverted arch blocks.

[0004] During the assembly process of the prefabricated invert arch blocks, the hoisting trolley of the crane is used to squeeze the prefabricated invert arch blocks tightly.

[0005] However, the crane's suspended single block tilts and squeezes forward, causing uneven force on the prefabricated invert block, making it difficult to achieve uniform gaps in all directions.

[0006] Therefore, there is an urgent need in the art for a synchronous and efficient tightening method for prefabricated invert blocks in a TBM tunneling tunnel to solve the above-mentioned problems. Summary of the invention

[0007] The purpose of the present invention is to provide a method for synchronously and efficiently tightening prefabricated invert blocks in a TBM tunneling tunnel to solve the problems existing in the above-mentioned prior art, so that two adjacent prefabricated invert blocks can be uniformly stressed and the gaps between adjacent prefabricated invert blocks in all directions can be evenly distributed.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The invention discloses a synchronous and efficient tightening method for a prefabricated invert block of a TBM tunneling tunnel, comprising the following steps:

[0010] S1, using a crane to transport the first prefabricated inverted arch block to the pit to be installed in the tunnel, and installing an upper tensioning seat on both sides above the first prefabricated inverted arch block, and installing a plurality of lower tensioning plates on both sides of the lower end of the first prefabricated inverted arch block;

[0011] S2, using a crane to transport the second prefabricated inverted arch block to the pit to be installed in the tunnel, and arrange it adjacent to the first prefabricated inverted arch block, and respectively install an upper tensioning seat on both sides of the upper side of the second prefabricated inverted arch block, and respectively install a plurality of lower tensioning plates on both sides of the lower end of the second prefabricated inverted arch block;

[0012] S3, using an upper tensioning screw to sequentially penetrate the corresponding upper tensioning seats on the same side of the first prefabricated inverted arch block and the second prefabricated inverted arch block, both ends of the upper tensioning screw are respectively threadedly connected with an upper tensioning nut, the upper tensioning nut located at the first end of the upper tensioning screw abuts against the upper tensioning seat on the first prefabricated inverted arch block, and an upper tensioning jack is installed between the upper tensioning nut located at the second end of the upper tensioning screw and the upper tensioning seat on the second prefabricated inverted arch block;

[0013] S4, using a lower tensioning screw to sequentially penetrate the corresponding lower tensioning plates on the same side of the first prefabricated inverted arch block and the second prefabricated inverted arch block, both ends of the lower tensioning screw are respectively threadedly connected with a lower tensioning nut, the lower tensioning nut at the first end of the lower tensioning screw abuts against the lower tensioning plate on the first prefabricated inverted arch block, and a lower tensioning jack is installed between the lower tensioning nut at the second end of the lower tensioning screw and the second prefabricated inverted arch block;

[0014] S5, controlling the upper tensioning jack and the lower tensioning jack to extend, so as to realize the tensioning of the first prefabricated inverted arch block and the second prefabricated inverted arch block.

[0015] Preferably, step S6 is also included, after the first prefabricated inverted arch block and the second prefabricated inverted arch block are installed, the next prefabricated inverted arch block can be installed, and after the installation of 4-6 prefabricated inverted arch blocks is completed, casting is first performed, and then the next group of 4-6 prefabricated inverted arch blocks are installed.

[0016] Preferably, two lower tensioning screws are provided on each side below the prefabricated invert block.

[0017] Preferably, the upper tensioning seat on the first prefabricated inverted arch block and the upper tensioning seat on the second prefabricated inverted arch block are arranged adjacent to each other.

[0018] Preferably, the upper tensioning jack and the lower tensioning jack are both hollow jacks.

[0019] Preferably, a top plate is provided between the lower tensioning nut and the lower tensioning jack at the second end of the second prefabricated inverted arch block.

[0020] Preferably, a guard plate is installed on the contact surface between the second prefabricated inverted arch block and the lower tensioning jack.

[0021] Preferably, a fixing frame is installed on one side of the lower tensioning plate, and the lower tensioning screw passes through the fixing frame.

[0022] Preferably, a curved steel plate is installed below the prefabricated inverted arch block.

[0023] Compared with the prior art, the present invention has achieved the following technical effects:

[0024] The present invention solves the problems of uneven force and skew pulling of the prefabricated inverted arch block during compaction construction by respectively setting tension points at the bottom and the top of the prefabricated inverted arch block, so that the gaps of the prefabricated inverted arch block after compaction are uniform. In addition, the parts with larger gaps can be tightened separately, thereby improving the construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. 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 these drawings without paying creative work.

[0026] Figure 1 It is a front view of an uninstalled prefabricated invert block in the method for synchronously and efficiently tightening a prefabricated invert block for a TBM tunneling tunnel according to an embodiment of the present invention;

[0027] Figure 2 It is a front view of a method for synchronously and efficiently tightening a prefabricated invert block of a TBM tunneling tunnel according to an embodiment of the present invention;

[0028] Figure 3 It is a schematic diagram of the connection between the first prefabricated invert block and the second prefabricated invert block in the method for synchronously and efficiently tightening the prefabricated invert blocks of a TBM tunneling tunnel according to an embodiment of the present invention;

[0029] Figure 4 It is a schematic diagram of the connection between the second prefabricated invert block and the third prefabricated invert block in the method for synchronously and efficiently tightening prefabricated invert blocks of a TBM tunneling tunnel according to an embodiment of the present invention;

[0030] In the figure: 1-prefabricated invert block; 2-upper tensioning seat; 3-upper tensioning screw; 4-upper tensioning jack; 5-lower tensioning plate; 6-lower tensioning screw; 7-lower tensioning jack; 8-guard plate; 9-top plate; 10-fixed frame; 11-crane. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] As shown in the figure, the purpose of the present invention is to provide a method for synchronously and efficiently tightening prefabricated arch blocks of a TBM tunneling tunnel to solve the problems existing in the above-mentioned prior art, so that two adjacent prefabricated arch blocks can be evenly stressed and the gaps between adjacent prefabricated arch blocks in all directions are evenly distributed.

[0033] 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.

[0034] like Figure 1-Figure 4 As shown, this embodiment provides a method for synchronously and efficiently tightening a prefabricated invert block of a TBM tunnel, comprising the following steps:

[0035] S1, using a crane 11 to transport the first prefabricated inverted arch block 1 to the pit to be installed in the tunnel, and placing it at the first position of the pit to be installed. An upper tensioning seat 2 is respectively installed on both sides of the upper part of the first prefabricated inverted arch block 1 by bolts, and corresponding threaded holes are provided on both sides of the upper part of the first prefabricated inverted arch block 1. Then, a plurality of lower tensioning plates 5 are respectively installed on both sides of the lower end of the first prefabricated inverted arch block 1, and the lower tensioning plates 5 can also be fixed by bolts, or can also be integrally formed with the prefabricated inverted arch block 1.

[0036] S2, using a crane 11 to transport the second prefabricated inverted arch block 1 to the pit to be installed in the tunnel, and place it adjacent to the first prefabricated inverted arch block 1, and the two are placed closely along the length direction of the tunnel. Similarly, an upper tensioning seat 2 is respectively installed on both sides of the upper part of the second prefabricated inverted arch block 1 by bolts, and a plurality of lower tensioning plates 5 are respectively installed on both sides of the lower end of the second prefabricated inverted arch block 1. The upper tensioning seat 2 and the lower tensioning plates 5 on the first prefabricated inverted arch block 1 and the second prefabricated inverted arch block 1 are arranged in exactly the same position and number.

[0037] S3, use an upper tensioning screw 3 to sequentially penetrate the corresponding upper tensioning seat 2 on the same side of the first prefabricated inverted arch block 1 and the second prefabricated inverted arch block 1, the upper tensioning seat 2 is provided with a through hole corresponding to the upper tensioning screw 3, and the two ends of the upper tensioning screw 3 after passing through the two upper tensioning seats 2 are respectively threadedly connected with an upper tensioning nut. The upper tensioning nut at the first end of the upper tensioning screw 3 abuts against the upper tensioning seat 2 on the first prefabricated inverted arch block 1, specifically, abuts against the side of the upper tensioning seat 2 away from the second prefabricated inverted arch block 1. An upper tensioning jack 4 is installed between the upper tensioning nut at the second end of the upper tensioning screw 3 and the upper tensioning seat 2 on the second prefabricated inverted arch block 1, and the telescopic end of the upper tensioning jack 4 abuts against the upper tensioning nut at the second end of the upper tensioning screw 3.

[0038] S4. Similarly, a lower tensioning screw rod 6 is used to sequentially penetrate the corresponding lower tensioning plates 5 on the same side of the first prefabricated inverted arch block 1 and the second prefabricated inverted arch block 1, and corresponding through holes are provided on the lower tensioning plates 5. A lower tensioning nut is threadedly connected to each of the two ends of the lower tensioning screw rod 6, and the lower tensioning nut at the first end of the lower tensioning screw rod 6 abuts against the lower tensioning plate 5 on the first prefabricated inverted arch block 1 (a side away from the second prefabricated inverted arch block 1), and a lower tensioning jack 7 is installed between the lower tensioning nut at the second end of the lower tensioning screw rod 6 and the second prefabricated inverted arch block 1, and the telescopic end of the lower tensioning jack 7 is adjacent to the lower tensioning nut on the second end of the lower tensioning screw rod 6.

[0039] S5, control the upper tensioning jack 4 and the lower tensioning jack 7 to extend, so that the upper tensioning nut at the first end of the upper tensioning screw 3 and the lower tensioning nut at the first end of the lower tensioning screw 6 are tightened toward the second prefabricated inverted arch block 1, and the second prefabricated inverted arch block 1 is tightened toward the first prefabricated inverted arch block 1 under the action of the upper tensioning seat 2 and the lower tensioning jack 7, so that the first prefabricated inverted arch block 1 and the second prefabricated inverted arch block 1 can be tightened. Of course, when errors occur during the assembly process, the errors can be eliminated by controlling the extension and contraction of one of the upper tensioning jacks 4 or the lower tensioning jack 7, thereby improving the overall installation accuracy.

[0040] After the first and second prefabricated inverted arch blocks 1 are tightened, the connection between the second prefabricated inverted arch block 1 and the third prefabricated inverted arch block 1 can also be achieved in the same way, that is, the connecting element between the first prefabricated inverted arch block 1 and the second prefabricated inverted arch block 1 is applied between the second prefabricated inverted arch block 1 and the third prefabricated inverted arch block 1.

[0041] In this embodiment, step S6 is also included, after the first prefabricated inverted arch block 1 and the second prefabricated inverted arch block 1 are installed, the next prefabricated inverted arch block 1 can be installed. After the installation of 4-6 prefabricated inverted arch blocks 1 is completed, they are first cast, and then the next group of 4-6 prefabricated inverted arch blocks 1 are installed. The reason why 4-6 blocks are set as a group is that the crane 11 of this embodiment adopts a bridge crane, and its length is approximately matched with the length of 4-6 prefabricated inverted arch blocks 1 along the length direction of the tunnel. Therefore, after the tensioning effect of 4-6 prefabricated inverted arch blocks 1 is completed, it is necessary to cast and fix it, and then drive the crane 11 to move it to the direction of the last prefabricated inverted arch block 1, so as to facilitate the transportation and placement of the subsequent prefabricated inverted arch blocks 1.

[0042] In this embodiment, two lower tensioning screws 6 are provided on each side of the lower side of the prefabricated invert block 1. Figure 2It can be seen that a partition wall is provided on both sides of the middle hole of the prefabricated inverted arch block 1, and the partition wall is used to distinguish the middle hole from the holes on both sides. A lower tensioning screw 6 is provided on both sides of the two partition walls, and correspondingly, a lower tensioning plate 5 is fixed on both sides of the partition walls.

[0043] In this embodiment, if Figure 3 As shown, the upper tension seat 2 on the first prefabricated inverted arch block 1 and the upper tension seat 2 on the second prefabricated inverted arch block 1 are arranged adjacent to each other. Alternatively, the upper tension seat 2 on the first prefabricated inverted arch block 1 and the upper tension seat 2 on the second prefabricated inverted arch block 1 may also be spaced apart.

[0044] In this embodiment, the upper tensioning jack 4 and the lower tensioning jack 7 are both 10t hollow jacks. The reason for using the hollow jack is mainly for the upper tensioning jack 4, because only one upper tensioning screw 3 is arranged on the upper side of the prefabricated invert block 1, and the use of the hollow jack allows the upper tensioning screw 3 to pass through the center thereof, so that the upper tensioning jack 4 and the upper tensioning nut located at the second end of the upper tensioning screw 3 can be arranged coaxially. The lower tensioning jack 7 can be located between the two lower tensioning screws 6 on the same side.

[0045] In this embodiment, since two lower tensioning screws 6 are provided on each side of the lower end of the prefabricated inverted arch block 1, that is, two lower tensioning nuts, the lower tensioning jack 7 should push the two lower tensioning nuts at the same time. As mentioned above, the lower tensioning jack 7 is located between the two lower tensioning screws 6 on the same side, so in order to enable it to push the two lower tensioning nuts at the same time, a top plate 9 is provided between the lower tensioning nut at the second end of the second prefabricated inverted arch block 1 and the lower tensioning jack 7. When the lower tensioning jack 7 pushes the top plate 9, the top plate 9 will transmit the thrust to the lower tensioning nut.

[0046] In this embodiment, a guard plate 8 is installed on the contact surface between the second prefabricated inverted arch block 1 and the lower tensioning jack 7, so as to prevent the lower tensioning jack 7 from damaging the prefabricated inverted arch block 1 when extending.

[0047] In this embodiment, a fixed frame 10 is installed on one side of the lower tensioning plate 5. The fixed frame 10 is a square tube structure, and the lower tensioning screw 6 passes through the horizontal side wall through hole of the fixed frame 10. The fixed frame 10 is provided for protection, mainly for when the lower tensioning screw 6 is in an inclined state (due to the influence of the tunnel shape, there will be bending and tensioning). In this case, if the lower tensioning nut at the first end of the lower tensioning screw 6 falls off due to unexpected factors, the fixed frame 10 can limit the inclined lower tensioning screw 6 to prevent it from being separated from the fixed frame 10 under the pulling force of the lower tensioning jack 7, thereby improving the safety of use.

[0048] In this embodiment, a curved steel plate is installed under the prefabricated inverted arch block 1. The reason for this arrangement is that the pad under the existing prefabricated block is easily crushed and the waterproof layer under it is easily damaged due to uneven forces in all directions. The provision of a curved steel plate can effectively reduce the damage to the waterproof layer caused by the prefabricated inverted arch block 1 during the compaction process, and combined with the relatively small displacement of the two adjacent prefabricated inverted arch blocks 1 during the tensioning process in this embodiment, the damage to the waterproof layer can be further reduced.

[0049] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for synchronously and efficiently tightening prefabricated invert blocks in a TBM tunneling tunnel, characterized in that: The following steps are involved: S1, using a crane to transport the first prefabricated inverted arch block to the pit to be installed in the tunnel, and installing an upper tensioning seat on both sides above the first prefabricated inverted arch block, and installing a plurality of lower tensioning plates on both sides of the lower end of the first prefabricated inverted arch block; S2, using a crane to transport the second prefabricated inverted arch block to the pit to be installed in the tunnel, and arrange it adjacent to the first prefabricated inverted arch block, and respectively install an upper tensioning seat on both sides of the upper side of the second prefabricated inverted arch block, and respectively install a plurality of lower tensioning plates on both sides of the lower end of the second prefabricated inverted arch block; S3, using an upper tensioning screw to sequentially penetrate the corresponding upper tensioning seats on the same side of the first prefabricated inverted arch block and the second prefabricated inverted arch block, both ends of the upper tensioning screw are respectively threadedly connected with an upper tensioning nut, the upper tensioning nut located at the first end of the upper tensioning screw abuts against the upper tensioning seat on the first prefabricated inverted arch block, and an upper tensioning jack is installed between the upper tensioning nut located at the second end of the upper tensioning screw and the upper tensioning seat on the second prefabricated inverted arch block; S4, using a lower tensioning screw to sequentially penetrate the corresponding lower tensioning plates on the same side of the first prefabricated inverted arch block and the second prefabricated inverted arch block, both ends of the lower tensioning screw are respectively threadedly connected with a lower tensioning nut, the lower tensioning nut at the first end of the lower tensioning screw abuts against the lower tensioning plate on the first prefabricated inverted arch block, and a lower tensioning jack is installed between the lower tensioning nut at the second end of the lower tensioning screw and the second prefabricated inverted arch block; S5, controlling the upper tensioning jack and the lower tensioning jack to extend, so as to realize the tensioning of the first prefabricated inverted arch block and the second prefabricated inverted arch block.

2. The method for synchronously and efficiently tightening prefabricated invert blocks for TBM tunneling according to claim 1 is characterized in that: The method further includes step S6, wherein after installing the first prefabricated inverted arch block and the second prefabricated inverted arch block, the next prefabricated inverted arch block may be installed. After the installation of 4 to 6 prefabricated inverted arch blocks is completed, casting is performed first, and then the next group of 4 to 6 prefabricated inverted arch blocks are installed.

3. The method for synchronously and efficiently tightening prefabricated invert blocks for TBM tunneling according to claim 1 is characterized in that: Two lower tensioning screws are arranged on each side below the prefabricated invert block.

4. The method for synchronously and efficiently tightening prefabricated invert blocks for TBM tunneling according to claim 1 is characterized in that: The upper tensioning seat on the first prefabricated inverted arch block and the upper tensioning seat on the second prefabricated inverted arch block are arranged adjacent to each other.

5. The method for synchronously and efficiently tightening prefabricated invert blocks for TBM tunneling according to claim 1 is characterized in that: Both the upper tensioning jack and the lower tensioning jack are hollow jacks.

6. The method for synchronously and efficiently tightening prefabricated invert blocks for TBM tunneling according to claim 1 is characterized in that: A top plate is provided between the lower tensioning nut and the lower tensioning jack at the second end of the second prefabricated inverted arch block.

7. The method for synchronously and efficiently tightening prefabricated invert blocks for TBM tunneling according to claim 1 is characterized in that: A guard plate is installed on the contact surface between the second prefabricated invert arch block and the lower tensioning jack.

8. The method for synchronously and efficiently tightening prefabricated invert blocks for TBM tunneling according to claim 1, characterized in that: A fixing frame is installed on one side of the lower tensioning plate, and the lower tensioning screw passes through the fixing frame.

9. The synchronous and efficient tensioning method for prefabricated invert blocks of a TBM tunneling tunnel according to claim 1, characterized in that: A curved steel plate is installed under the prefabricated invert block.

Images