A method for quickly installing double shield TBM steel-concrete composite segments and grouting in weak and broken zones

Abstract

The present invention provides a steel-concrete composite pipe segment and grouting construction method for fast installation of double-shield TBM construction in a weak broken zone, wherein the steel-concrete composite pipe segment includes a capping block, a bottom pipe block, and two standard blocks for connecting the capping block and the bottom pipe block; the capping block body is a steel pipe segment, and the capping block has an inner cavity, the top of the inner cavity of the capping block is open and covered with an epoxy resin film, and the epoxy resin film can be opened upward; a rubber airbag device is provided in the inner cavity of the capping block; a grouting connection port is provided on the inner side of the capping block, and the grouting connection port is connected to the inner cavity. The present invention can effectively resist the upward buoyancy of the upper panel of the capping block during grouting through the rubber airbag, balance the pressure from the top surrounding rock, ensure that the pipe segment lining ring does not deform, and improve stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of double-shield TBM excavation, and specifically relates to a lining segment structure and a grouting construction method for double-shield TBM excavation under conditions of high water pressure, weak broken zones, and arch collapse, and more particularly to a double-shield TBM construction steel-concrete composite segment and a grouting construction method for rapid installation in a weak broken zone. Background Art

[0002] Double shield TBM excavation technology has been widely used in stratum excavation operations and has achieved remarkable results. It has the advantages of strong adaptability, high efficiency, and good excavability. Double shield TBM construction adopts prefabricated lining segments, backfilling with pea gravel and grouting for support. The lining segments are installed at the tail of the shield. At this time, the surrounding rock and the segments are in a non-contact state, usually with a gap of 5 to 15 cm. Pea gravel is required for backfilling, and then grouting is performed to form an integrated support structure with the segments, backfill layer and surrounding rock.

[0003] The density of pea gravel backfill grouting is an important indicator affecting the working performance of TBM tunnels. However, the construction technology of backfill grouting in actual projects is still under continuous exploration, and the speed of updating new grouting construction technologies is slow. At present, relevant research results are mostly focused on the quality control measures of backfill grouting. According to past experience, the backfill grouting has a high construction quality by controlling the pea gravel grading, the mix ratio of cement slurry, and the grouting pressure. However, in the face of complex construction environments, the density of backfill grouting is often low. Generally, the lack of density of backfill grouting occurs more at the top and side of the segment lining, the surrounding rock is deformed, the overall support effect and the waterproof performance of the lining segment are greatly weakened, cracks, water seepage and other quality problems occur, and it is easy to cause stress concentration to cause segment cracking and other phenomena. With the development of tunnel construction towards deep high water pressure and high ground stress environment, it is necessary to solve the problem from the most fundamental aspects of lining segment and grouting construction to achieve overall good support and waterproofing effects and increase the service life. Summary of the invention

[0004] The first purpose of the present invention is to provide a double-shield TBM construction steel-concrete composite segment for rapid installation in a weak broken zone, to solve the overall structural strength and waterproofing effect of the lining support of the double-shield TBM under adverse geological conditions such as high water pressure and collapse of the top of the weak broken zone, to greatly improve the stability and safety performance of the lining segment, and to increase the service life of the tunnel.

[0005] To this end, the above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0006] A double shield TBM construction steel-concrete composite pipe segment for rapid installation in a weak fracture zone, characterized in that: the steel-concrete composite pipe segment comprises a capping block, a bottom pipe block and two standard blocks for connecting the capping block and the bottom pipe block;

[0007] The main body of the capping block is a steel pipe sheet, and the capping block has an inner cavity. The top of the inner cavity of the capping block is open and covered with an epoxy resin film, and the epoxy resin film can be opened upward; a rubber airbag device is provided in the inner cavity of the capping block;

[0008] A grouting connection port is provided on the inner side of the capping block, and the grouting connection port is communicated with the inner cavity;

[0009] The rubber airbag device includes a rubber airbag, which is provided with an inflation port and an inflation spiral sleeve. The inflation port of the rubber airbag is located in the inner cavity of the capping block, the inner end of the inflation spiral sleeve is connected to the inflation port, and the outer end of the inflation spiral sleeve is not located in the inner cavity of the capping block; the inflation spiral sleeve is detachably connected to the inflation port.

[0010] The epoxy resin membrane is waterproof, degrades quickly, can react with slurry, and has high strength. When the rubber airbag in the inner cavity is inflated and popped out, the epoxy resin membrane is quickly separated from the upper panel of the capping block and adheres tightly to the top surrounding rock surface to form a waterproof layer.

[0011] While adopting the above technical solutions, the present invention may also adopt or combine the following technical solutions:

[0012] As a preferred technical solution of the present invention: the bottom pipe block and the two standard blocks are provided with grouting pipes arranged in a horizontal and vertical mesh to form a series circulation with the annular joints and the longitudinal joints respectively, and the grouting pipes are connected with the lifting holes on the bottom pipe block and the standard blocks.

[0013] As a preferred technical solution of the present invention: the capping block is formed by being surrounded by an upper panel, a lower bottom plate, a left side plate, a right side plate, an inner side plate and an outer side plate.

[0014] As a preferred technical solution of the present invention: the upper panel, lower bottom plate, left side plate, right side plate, inner side plate and outer side plate are all 3 cm thick hot-rolled steel plates.

[0015] As a preferred technical solution of the present invention: two lifting holes are provided on both sides of the grouting connection port inside the capping block.

[0016] As a preferred technical solution of the present invention: the grouting connection port is used to communicate with the grouting reaction equipment, and the grouting reaction equipment includes a grouting connection pipe, a check valve arranged on the grouting connection pipe, and a pressure gauge. The pressure gauge is used to monitor the grouting pressure in the pipe segment as one of the reference bases for the grouting density.

[0017] As a preferred technical solution of the present invention: the capping block is provided with circumferential high-strength bolt holes on both sides of the circumferential splicing, which is convenient for installation and positioning, and helps to correct deviation and turn when assembling the pipe segments, and perform tightening operations after closing into a ring; the capping block is provided with multiple positioning pin holes on both sides of the longitudinal splicing, which improves the installation accuracy of the longitudinal pipe segments.

[0018] As a preferred technical solution of the present invention: a plurality of annular support ribs and a plurality of longitudinal support ribs perpendicular to the annular support ribs are provided in the capping block;

[0019] The annular support ribs include four first annular support ribs on the outside and two second annular support ribs on the inside, and the longitudinal support ribs are three;

[0020] The second annular support ribs and the longitudinal support ribs form a structural support for the inner cavity of the capping block, and the inner cavity is made of a steel shell;

[0021] The first annular support rib forms a structural support for the entire capping block.

[0022] As a preferred technical solution of the present invention: a check valve is arranged inside the rubber airbag, and the check valve on the rubber airbag is used to flow out the slurry part exceeding the pressure when the grouting liquid in the rubber airbag is filled to a certain pressure.

[0023] Another object of the present invention is to provide a grouting construction method for quickly installing double-shield TBM construction steel-concrete composite pipe segments in a weak broken zone.

[0024] To this end, the above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0025] According to the above-mentioned grouting construction method for quickly installing double shield TBM steel-concrete composite segments in weak fracture zones, it is characterized in that the grouting construction method comprises the following steps:

[0026] S1. In the double-shield TBM excavation mode, TBM excavation and segment installation are carried out simultaneously. The segments are prefabricated by the segment prefabrication plant and transported to the TBM equipment installation area. The segment crane grabs the segments and places them on the segment feeder. The segment installer installs the bottom segment, two standard segments, and finally the capping segment in sequence.

[0027] S2. Before installing the lining segments, check and clean the segments and the installation area, then paste the water-expandable waterstop strips at the inner arc of the longitudinal joints and annular joints, and reserve gaps near the outer arc of the surrounding rock to form a grouting return path;

[0028] S3. After the pea gravel backfill is completed, grouting is performed; before grouting, the inflation spiral casing is screwed into the hoisting hole on one side of the capping block and connected to the inflation port to inflate the rubber airbag;

[0029] S4. Under the action of inflation pressure, the rubber airbag is inflated and popped out, and the epoxy resin film at the top of the inner cavity of the capping block is quickly separated from the upper panel of the capping block, and the upper part of the rubber airbag is squeezed out of the inner cavity of the capping block and closely adheres to the top surrounding rock surface;

[0030] S5. Take out the inflatable spiral casing, seal the lifting holes on the capping block and the lifting holes on the bottom pipe block and the two standard blocks, and connect the grouting reaction equipment and the grouting connection port by using the TBM grouting system;

[0031] The slurry first fills the inner cavity of the capping block, and under the action of the pressure difference, the slurry is injected into the rubber airbag through the inflation port on the rubber airbag;

[0032] When the slurry inside the rubber airbag is filled to a certain pressure, the check valve on the rubber airbag automatically opens, and the slurry flows back through the check valve to the gap between the segment body and the surrounding rock;

[0033] S6. Observe the pressure gauge on the grouting reaction equipment connected to the grouting connection port. When the pressure reading on the pressure gauge reaches 0.1-0.2 MPa, the bottom pipe block and the two standard blocks are symmetrically grouted through the hoisting holes on their respective segments at the same time. At this time, the slurry forms an overall circulation, and the gaps inside the segment ring and between the segment ring and the surrounding rock form internal and external pressure balance, ensuring that the grouting density of the annular joint and the longitudinal joint meets the requirements;

[0034] S7. Continue to inject grout into the lifting holes on the bottom pipe block and the two standard blocks. When the pressure reading on the pressure gauge reaches 0.3-0.35 MPa, enter the pressure maintaining state. If the pressure value does not change, stop injecting grout.

[0035] The present invention provides a method for quickly installing a double-shield TBM construction steel-concrete composite segment and grouting construction in a weak broken zone, which has the following beneficial effects:

[0036] 1) By providing an inner cavity in the capping block and a rubber airbag in the inner cavity, the rubber airbag can effectively resist the upward buoyancy of the upper panel of the capping block during grouting, balance the pressure from the top surrounding rock, ensure that the segment lining ring does not deform, and improve stability;

[0037] 2) In addition, the internal grouting of the capping block and the internal grouting of the bottom pipe block and the two standard blocks form a dynamic cycle, and the pressure balance state can be achieved through the pressure gauge control on the grouting reaction equipment, which effectively improves the phenomenon of insufficient local density on the top and side of the lining segment, and the overall support and waterproofing effect of the segment ring are fully guaranteed, which can meet the safety and durability of the structure in poor geological areas during construction and operation;

[0038] 3) Grouting pipes arranged in a horizontal and vertical mesh are set in the lining ring of the bottom pipe block and the two standard blocks, so that the longitudinal joints and annular joints of the pipe segments are not limited to the filling of the water stop strips, and the grouting is full. The lining ring and the gap between the lining ring and the surrounding rock form a force-bearing whole, which improves the safety performance, waterproof performance and durability of the double shield TBM;

[0039] The problem of loose grouting in the backfill of the double-shield TBM lining segment mostly occurs at the top and side of the segment lining. The top of the lining is effectively solved by the design of steel segments (capping blocks in the form of steel segments). In order to form a grouting ring, grouting pipes are arranged inside the segment ring at the side and at the joints, forming a series cycle with the annular joints (rings and rings) and longitudinal joints (segments and segments). After the grouting is completed, a complete closed system is obtained, achieving overall good support and waterproofing effects.

[0040] Throughout the text, the lifting holes have lifting functions and can also be used for grouting operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a diagram of the rapid installation of a double-shield TBM construction steel-concrete composite segment in a weak and broken zone provided by the present invention;

[0042] Figure 2 This is an expanded diagram of the inner side of the steel-concrete composite segment;

[0043] Figure 3 It is an elevation view of the steel-concrete composite segment when the rubber airbag is inflated and popped out state;

[0044] Figure 4 It is a diagram of the internal structure of the capping block;

[0045] Figure 5 This is an expanded diagram of the inner side of the capping block;

[0046] Figure 6 This is a cross-sectional diagram of the center 1 / 2 of the capping block;

[0047] In the figure: 1- bottom pipe block; 2 / 3- standard block; 4- capping block; 41- main pipe plate; 410- upper panel; 411- lower bottom plate; 412- left side plate; 413- right side plate; 414- inner side plate; 415- outer side plate; 416- annular high-strength bolt hole; 418- positioning pin hole; 42- annular support rib; 421- first annular support rib; 422- second annular support rib; 43- longitudinal support rib; 44- inner cavity; 45- rubber airbag device; 451- rubber airbag; 452- inflation spiral sleeve; 453- inflation port; 46- epoxy resin film; 47- grouting reaction equipment; 470- grouting connecting pipe; 471- check valve; 472- pressure gauge; 48- hoisting hole; 49- grouting connecting port; 5- grouting pipe. DETAILED DESCRIPTION

[0048] The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

[0049] The main body of the capping block 4 is a steel pipe segment, and the capping block 4 is composed of a main pipe segment body 41, annular support ribs 42, longitudinal support ribs 43, an inner cavity 44, a rubber airbag device 45, an epoxy resin film 46, a hoisting hole 48, and a grouting connection port 49.

[0050] A horizontal and vertical mesh of grouting pipes 5 are arranged inside the pipe segment rings of the bottom pipe block 1 and the two standard blocks 2 / 3, forming a series loop with the annular joints (rings and rings) and the longitudinal joints (segments and segments). The grouting pipes 5 are connected to the lifting holes 48 on the bottom pipe block 1 and the standard blocks 2 / 3.

[0051] The main pipe segment body 41 of the capping block 4 is formed by a total of 6 steel plates, namely, an upper panel 410, a lower bottom plate 411, a left side plate 412, a right side plate 413, an inner side plate 414, and an outer side plate 415. The 6 steel plates in the main pipe segment body 41 are all 3 cm thick hot-rolled steel plates. The center of the upper panel 410 of the main pipe segment body is non-solid, and is an elliptical hollow design. An epoxy resin film 46 is installed before construction. A grouting connection port 49 and two hoisting holes 48 are provided at the center of the lower bottom plate 411. The grouting connection port 49 can be connected to the TBM grouting system through a grouting reaction device 47 for grouting. An circumferential high-strength bolt hole 416 is provided on the left side plate 412 and the right side plate 413 of the contact surface of the annular spliced ​​pipe segment, and a tightening operation is performed after closing into a ring. Two positioning pin holes 418 are provided on the longitudinal inner side plate 414 and the outer side plate 415 respectively to improve the installation accuracy of the longitudinal pipe segment.

[0052] The grouting reaction equipment 47 is composed of a grouting connection pipe 470, a check valve 471 and a pressure gauge 472; it is connected to the TBM grouting system during operation, and the pressure data on the pressure gauge 472 is used as a basis for monitoring the grouting pressure in the lining ring.

[0053] The main segment body 41 is reinforced by annular support ribs 42 and longitudinal support ribs 43. The annular support ribs 42 are composed of first annular support ribs 421 and second annular support ribs 422. There are 6 annular support ribs 42, including 4 first annular support ribs 421, 2 second annular support ribs 422, and 3 longitudinal support ribs 43. In order to adapt to the surrounding rock pressure and TBM installation stress, 2 first annular support ribs 421 are set on both sides of the annular support rib 42, and the steel arch rib at the upper panel 410 is connected and fixed by 2 longitudinal support ribs 43; the second annular support rib 422 is welded and fixed to the lower bottom plate 411, the left side plate 412, and the bottom surface of the inner cavity 44, and a single longitudinal support rib 43 fixes the center position of the second annular support rib 422 to form a complete segment support system.

[0054] The interior of the capping block is a cavity. The inner cavity 44 in the cavity is made of a steel shell and is equipped with a rubber airbag device 45. The rubber airbag device 45 includes a rubber airbag 451, an inflation spiral sleeve 452 and an inflation port 453. The inflation spiral sleeve 452 is rotated and inserted into a lifting hole 48 on one side and is connected to the inflation port 453. The rubber airbag 451 is provided with two check valves. When the grouting in the rubber airbag reaches a certain pressure, the slurry can flow out from the check valve port.

[0055] The above-mentioned soft and broken zone rapid installation of double shield TBM construction steel-concrete composite pipe segment is carried out by grouting construction in the following way:

[0056] Process bottom pipe blocks, standard blocks and capping blocks according to design requirements;

[0057] According to the characteristics of double shield TBM excavation, the segment rings are hoisted and installed. After several segment rings are installed, pea gravel backfilling and grouting are carried out;

[0058] Repeat the above installation steps until the double shield TBM segment lining construction is completed.

[0059] Specifically, in the double-shield TBM excavation mode, TBM excavation and segment installation are carried out simultaneously; the segments (bottom segment, standard segment, capping segment) are prefabricated by the segment prefabrication plant and transported to the TBM equipment installation area. The segment crane grabs the segments and places them on the segment feeder. The segment installer installs the bottom segment 1, standard segment 2 / 3, and finally the capping segment 4 in sequence.

[0060] Before installing the lining segments, check and clean the segments and installation area, then paste the water-expandable waterstop strips at the inner arc of the longitudinal joints and annular joints, and reserve gaps near the outer arc of the surrounding rock to form a grouting return path;

[0061] After the pea gravel backfill is completed, grouting is performed; before grouting, the inflation spiral sleeve 452 is screwed into the left hoisting hole 48, and the inflation spiral sleeve 452 is connected to the inflation port 453 to inflate the rubber airbag 451;

[0062] Under the action of the inflation pressure, the rubber airbag 451 is inflated and popped out, the epoxy resin film 46 is quickly separated from the upper panel 410, and the rubber airbag 451 is in close contact with the top surrounding rock surface, which can effectively resist the buoyancy on the segment ring, balance the top surrounding rock pressure, and prevent the top from further collapsing; at the same time, the inflation spiral casing 452 is taken out, the lifting hole 48 on the capping block and the redundant lifting holes on the other three segments are closed, and the grouting connection on the capping block is used to connect the TBM grouting system and the grouting reaction equipment 47. The interface 49 is connected, and the slurry first fills the inner cavity 44 of the capping block 4. Since the inflation port 453 is in the inner cavity 44 of the capping block and the inflation spiral sleeve 452 has been removed, under the action of the pressure difference, the slurry is injected into the rubber airbag 451 through the inflation port 453. When the slurry inside the rubber airbag 451 reaches a certain pressure, the check valve on the rubber airbag 451 automatically opens, and the slurry flows back through the check valve to the gap between the segment body and the surrounding rock.

[0063] Observe the pressure gauge 472 on the grouting reaction equipment 47. When the pressure reading on the pressure gauge 472 reaches 0.1-0.2 MPa, the bottom pipe block 1 and the two standard blocks 2 / 3 are symmetrically grouted through the lifting holes at the same time. At this time, the slurry forms an overall circulation, and the gaps inside the segment ring and between the segment ring and the surrounding rock form an internal and external pressure balance to ensure that the grouting density of the annular joint and the longitudinal joint meets the requirements. Continue grouting, and when the pressure reading on the pressure gauge 472 reaches 0.3-0.35 MPa, enter the pressure holding state. If the pressure value does not change, grouting can be stopped.

[0064] The present invention is based on the rubber airbag device 45 in the capping block 4, combined with the grouting pipe 5 in the segment ring. The grouting process effectively improves the phenomenon of insufficient local density on the top and side of the lining segment, and the overall support and waterproofing effect of the segment ring are fully guaranteed, which can meet the safety and durability of the structure in poor geological areas during construction and operation.

[0065] The above are preferred implementations of the present invention. Those skilled in the art to which the present invention belongs can also change and modify the above implementations. Therefore, the present invention is not limited to the above specific implementations. Any obvious improvements, replacements or deformations made by those skilled in the art on the basis of the present invention belong to the protection scope of the present invention.

Claims

1. A double shield TBM construction steel-concrete composite segment for rapid installation in weak and broken zones, characterized by: The steel-concrete composite pipe segment comprises a capping block, a bottom pipe block and two standard blocks for connecting the capping block and the bottom pipe block; The main body of the capping block is a steel pipe sheet, and the capping block has an inner cavity. The top of the inner cavity of the capping block is open and covered with an epoxy resin film, and the epoxy resin film can be opened upward; a rubber airbag device is provided in the inner cavity of the capping block; A grouting connection port is provided on the inner side of the capping block, and the grouting connection port is communicated with the inner cavity; The rubber airbag device comprises a rubber airbag, which is provided with an inflation port and an inflation spiral sleeve, wherein the inflation port of the rubber airbag is located in the inner cavity of the capping block, the inner end of the inflation spiral sleeve is connected to the inflation port, and the outer end of the inflation spiral sleeve is not located in the inner cavity of the capping block; the inflation spiral sleeve is detachably connected to the inflation port; A check valve is arranged inside the rubber airbag, and the check valve on the rubber airbag is used to flow out the grouting liquid that exceeds the pressure when the grouting liquid in the rubber airbag is filled to a certain pressure; The steel-concrete composite segment is grouted in the following steps: S1. In the double-shield TBM excavation mode, TBM excavation and segment installation are carried out simultaneously. The segments are prefabricated by the segment prefabrication plant and transported to the TBM equipment installation area. The segment crane grabs the segments and places them on the segment feeder. The segment installer installs the bottom segment, two standard segments, and finally the capping segment in sequence. S2. Before installing the lining segments, check and clean the segments and the installation area, then paste the water-expandable waterstop strips at the inner arc of the longitudinal joints and annular joints, and reserve gaps near the outer arc of the surrounding rock to form a grouting return path; S3. After the pea gravel backfill is completed, grouting is performed; before grouting, the inflation spiral casing is screwed into the hoisting hole on one side of the capping block and connected to the inflation port to inflate the rubber airbag; S4. Under the action of inflation pressure, the rubber airbag is inflated and popped out, and the epoxy resin film at the top of the inner cavity of the capping block is quickly separated from the upper panel of the capping block, and the upper part of the rubber airbag is squeezed out of the inner cavity of the capping block and closely adheres to the top surrounding rock surface; S5. Take out the inflatable spiral casing, seal the lifting holes on the capping block and the lifting holes on the bottom pipe block and the two standard blocks, and connect the grouting reaction equipment and the grouting connection port by using the TBM grouting system; The slurry first fills the inner cavity of the capping block, and under the action of the pressure difference, the slurry is injected into the rubber airbag through the inflation port on the rubber airbag; When the slurry inside the rubber airbag is filled to a certain pressure, the check valve on the rubber airbag automatically opens, and the slurry flows back through the check valve to the gap between the segment body and the surrounding rock; S6. Observe the pressure gauge on the grouting reaction equipment connected to the grouting connection port. When the pressure reading on the pressure gauge reaches 0.1-0.2MPa, the bottom pipe block and the two standard blocks are symmetrically grouted through the hoisting holes on their respective segments at the same time. At this time, the slurry forms an overall circulation, and the gaps inside the segment ring and between the segment ring and the surrounding rock form internal and external pressure balance, ensuring that the grouting density of the annular joint and the longitudinal joint meets the requirements; S7. Continue to inject grout into the lifting holes on the bottom pipe block and the two standard blocks. When the pressure reading on the pressure gauge reaches 0.3-0.35MPa, enter the pressure maintaining state. If the pressure value does not change, stop injecting grout.

2. The double shield TBM construction steel-concrete composite segment for rapid installation in weak fracture zones according to claim 1 is characterized by: The bottom pipe block and the two standard blocks are provided with grouting pipes arranged in a horizontal and vertical mesh to form a series circulation with the annular joint and the longitudinal joint respectively. The grouting pipes are connected with the hoisting holes on the bottom pipe block and the standard blocks.

3. The double shield TBM construction steel-concrete composite segment for rapid installation in weak fracture zones according to claim 1 is characterized by: The capping block is formed by being surrounded by an upper panel, a lower bottom panel, a left side panel, a right side panel, an inner side panel and an outer side panel.

4. The double shield TBM construction steel-concrete composite segment for rapid installation in weak fracture zones according to claim 3 is characterized by: The upper panel, lower bottom plate, left side plate, right side plate, inner side plate and outer side plate are all 3 cm thick hot-rolled steel plates.

5. The double shield TBM construction steel-concrete composite segment for rapid installation in weak fracture zones according to claim 1 is characterized by: Two lifting holes are arranged on both sides of the grouting connection port inside the capping block.

6. The double shield TBM construction steel-concrete composite segment for rapid installation in weak fracture zones according to claim 1 or 5, characterized in that: The grouting connection port is used to communicate with the grouting reaction equipment, and the grouting reaction equipment includes a grouting connection pipe, a check valve and a pressure gauge arranged on the grouting connection pipe.

7. The double shield TBM construction steel-concrete composite segment for rapid installation in weak fracture zones according to claim 1 is characterized by: The capping block is provided with circumferential high-strength bolt holes on both sides of the circumferential splicing; and the capping block is provided with a plurality of positioning pin holes on both sides of the longitudinal splicing.

8. The double shield TBM construction steel-concrete composite segment for rapid installation in weak fracture zones according to claim 1 is characterized by: The capping block is provided with a plurality of annular support ribs and a plurality of longitudinal support ribs perpendicular to the annular support ribs; The annular support ribs include four first annular support ribs on the outside and two second annular support ribs on the inside, and the longitudinal support ribs are three; The second annular support ribs and the longitudinal support ribs form a structural support for the inner cavity of the capping block; The first annular support rib forms a structural support for the entire capping block.

9. A grouting construction method for quickly installing a double shield TBM steel-concrete composite segment in a weak fracture zone, characterized in that: The grouting construction method is used for grouting construction of double-shield TBM construction steel-concrete composite segments for rapid installation in weak fracture zones, wherein the steel-concrete composite segments include a capping block, a bottom pipe block, and two standard blocks for connecting the capping block and the bottom pipe block; The main body of the capping block is a steel pipe sheet, and the capping block has an inner cavity. The top of the inner cavity of the capping block is open and covered with an epoxy resin film, and the epoxy resin film can be opened upward; a rubber airbag device is provided in the inner cavity of the capping block; A grouting connection port is provided on the inner side of the capping block, and the grouting connection port is communicated with the inner cavity; The rubber airbag device comprises a rubber airbag, which is provided with an inflation port and an inflation spiral sleeve, wherein the inflation port of the rubber airbag is located in the inner cavity of the capping block, the inner end of the inflation spiral sleeve is connected to the inflation port, and the outer end of the inflation spiral sleeve is not located in the inner cavity of the capping block; the inflation spiral sleeve is detachably connected to the inflation port; A check valve is arranged inside the rubber airbag, and the check valve on the rubber airbag is used to flow out the grouting liquid that exceeds the pressure when the grouting liquid in the rubber airbag is filled to a certain pressure; And includes the following steps: S1. In the double-shield TBM excavation mode, TBM excavation and segment installation are carried out simultaneously. The segments are prefabricated by the segment prefabrication plant and transported to the TBM equipment installation area. The segment crane grabs the segments and places them on the segment feeder. The segment installer installs the bottom segment, two standard segments, and finally the capping segment in sequence. S2. Before installing the lining segments, check and clean the segments and the installation area, then paste the water-expandable waterstop strips at the inner arc of the longitudinal joints and annular joints, and reserve gaps near the outer arc of the surrounding rock to form a grouting return path; S3. After the pea gravel backfill is completed, grouting is performed; before grouting, the inflation spiral casing is screwed into the hoisting hole on one side of the capping block and connected to the inflation port to inflate the rubber airbag; S4. Under the action of inflation pressure, the rubber airbag is inflated and popped out, and the epoxy resin film at the top of the inner cavity of the capping block is quickly separated from the upper panel of the capping block, and the upper part of the rubber airbag is squeezed out of the inner cavity of the capping block and closely adheres to the top surrounding rock surface; S5. Take out the inflatable spiral casing, seal the lifting holes on the capping block and the lifting holes on the bottom pipe block and the two standard blocks, and connect the grouting reaction equipment and the grouting connection port by using the TBM grouting system; The slurry first fills the inner cavity of the capping block, and under the action of the pressure difference, the slurry is injected into the rubber airbag through the inflation port on the rubber airbag; When the slurry inside the rubber airbag is filled to a certain pressure, the check valve on the rubber airbag automatically opens, and the slurry flows back through the check valve to the gap between the segment body and the surrounding rock; S6. Observe the pressure gauge on the grouting reaction equipment connected to the grouting connection port. When the pressure reading on the pressure gauge reaches 0.1-0.2MPa, the bottom pipe block and the two standard blocks are symmetrically grouted through the hoisting holes on their respective segments at the same time. At this time, the slurry forms an overall circulation, and the gaps inside the segment ring and between the segment ring and the surrounding rock form internal and external pressure balance, ensuring that the grouting density of the annular joint and the longitudinal joint meets the requirements; S7. Continue to inject grout into the lifting holes on the bottom pipe block and the two standard blocks. When the pressure reading on the pressure gauge reaches 0.3-0.35MPa, enter the pressure maintaining state. If the pressure value does not change, stop injecting grout.

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