CN108825269B - Mechanical method connecting channel T-shaped junction self-adaptive waterproof structure - Google Patents

Abstract

The invention relates to a self-adaptive waterproof structure for the T-joint part of a mechanical communication channel. The water-stop grouting body behind the wall of the communication channel; the outsourcing waterproof system includes the blocking steel plates arranged on the bottom and roof of the tunnel main structure and the side wall blocking steel plates arranged on both sides of the tunnel main structure, and the sub-units of the blocking steel plates are modularized Welded on the steel pipe sheet of the connecting channel; the waterproof structure of the shield tunnel composite segment includes the shield tunnel composite segment, the shield tunnel concrete segment, the water-swellable rubber strip of the longitudinal joint, the water-swellable rubber sheet, and the cement-based permeable crystalline type Water-swellable gasket for paint and annular seam. The beneficial effects of the invention are as follows: the industrial modularized processing and production of the plugging steel plate adopted by the invention has the advantages of convenient installation, less seams, good waterproof effect, and can guarantee the construction progress.

Description

Self-adaptive waterproof structure for the T-joint part of the mechanical communication channel

technical field

The invention relates to a waterproof structure of a tunnel structure, in particular to a waterproof structure of a T-joint part of a mechanical connection channel and a shield tunnel.

Background technique

With the rapid economic development, my country's transportation industry is also advancing at a rapid pace, and subways are also being built in more and more cities. At present, the construction method of shallow burial and underground excavation is mainly used in subway tunnel projects in my country. In order to ensure the construction quality and construction safety, waterproofing during construction is the top priority of the entire construction process, and it is necessary to do a good job of waterproofing the main body of the subway. In the process of subway operation, the leakage of water in tunnels is also very common, and its harm is relatively serious. If the problem of water leakage cannot be effectively solved, it will have a great impact on the overall quality of the subway tunnel, which will affect the subway tunnel. The service life and safety of the structure. In the waterproofing of subway tunnels, construction joints are the weakest part. Therefore, the waterproofing of construction joints is particularly important. In general, construction joints refer to gaps in concrete structures due to the influence of construction methods or techniques. This greatly affects the self-waterproofing effect of concrete. According to the actual needs and design needs of the construction project, take reasonable solutions to improve the overall quality of the subway tunnel.

At present, the waterproof types of subway tunnels can be divided into three types, namely drainage type, waterproof type and combined type of anti-drainage. The waterproof type is a very direct and convenient drainage method and is widely used. Because the structural lining is always affected by water pressure, compared with the other two methods, the anti-leakage property is not strong, and it is difficult to solve the problem of water leakage. It is mainly waterproof, but it reduces the water pressure of the structural lining to a certain extent, thereby greatly reducing the possibility of water leakage. At the same time, the subway tunnel drainage project does not need to consume too much cost. When choosing the waterproof type of subway tunnels, it is necessary to comprehensively consider the local engineering geology, hydrogeology, subway waterproof grade and environmental requirements, etc., and meet the reliability of waterproofing on the premise that the drainage will not adversely affect the environment.

In order to solve the problems caused by the construction of the connection channel by the freezing method, Europe, Japan, Hong Kong and other places have successively carried out research on the connection channel roadheader, and developed under the technical conditions of non-freezing, small main tunnel space, cutting in and out holes, and complex channel structure. In this technology, the waterproofing of the T-joint between the main tunnel and the communication tunnel is particularly important for the safety of the subsequent use of the tunnel.

In recent years, a lot of research work has been done on tunnel waterproofing and construction methods at home and abroad. Patent Application No. 201010277951.5 discloses "Construction Method of Tunnel Waterproofing System". Steel plates and side wall waterproof steel plates arranged on both sides of the main tunnel structure, the method includes modular processing of subunits of waterproof steel plates, construction of the leveling layer of the floor waterproof steel plates, installation of the floor waterproof steel plates, installation of the side wall waterproof steel plates and subsequent operations . Patent Application No. 201510724005.3 discloses "A Tunnel Waterproof Structure and Construction Method". The waterproof structure consists of a water seepage layer and a waterproof layer formed in sequence outside the base layer. A whole piece of waterproof board is applied, and the adjacent waterproof boards along the tunnel depth direction are lapped and fixed.

The construction method of the tunnel waterproofing system disclosed in the prior art is generally used in the construction of large-scale tunnels in areas with high water content. problem with flaws. In some cases, it is difficult to ensure the safety of tunnel construction and subsequent use even after the construction of the tunnel waterproofing system is completed.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies in the prior art and provide a self-adaptive waterproof structure for the T-joint part of the mechanical communication channel.

The self-adaptive waterproof structure of the T-joint part of the mechanical connection channel includes an outsourcing waterproof system, a shield tunnel composite segment waterproof structure, a water-stop grouting body behind the shield tunnel wall, a connection channel segment waterproof structure and a connection channel. Water-stop grouting behind the wall;

The outsourcing waterproofing system includes blocking steel plates arranged on the bottom plate and top plate of the tunnel main structure and side wall blocking steel plates arranged on both sides of the tunnel main structure.

The waterproof structure of the shield tunnel composite segment includes the shield tunnel composite segment, the shield tunnel concrete segment, the water-swellable rubber strip of the longitudinal joint, the water-swellable rubber sheet, the cement-based permeable crystalline coating, and the water-swellable ring joint. Expansion gaskets, EPDM elastic gaskets, water-stop gaskets and sealing plates; water-swellable rubber strips, water-swellable rubber sheets, and cement-based permeable crystalline coatings are closely attached to the shield tunnel composite segment. EPDM rubber elastic gaskets are arranged on the partial ring and longitudinal joints of the shield tunnel composite segment; the water-stop gasket and the sealing plate are fixed on the shield tunnel composite segment by sealing bolts; the water-stop grouting behind the shield tunnel wall The body includes cement water glass double-liquid grouting and solid;

The waterproof structure of the contact channel segment includes the contact channel steel pipe sheet, the contact channel concrete segment, the water-expandable rubber gasket and the foam strip. Water-expandable rubber gasket; water-stop grouting body behind the wall of the communication channel includes cement water glass double-liquid grouting solid and ultra-fine cement water glass grouting sealing solid.

As a preference: the gasket is completely pressed into the gasket groove, the cross-sectional area of the gasket groove is not less than the cross-sectional area of the gasket, the aspect ratio of the caulking groove is not less than 2.5, the groove depth is 25-55mm, and the single-sided groove The width is 5-10mm.

As a preference: the water-stop gasket is made of polymer rubber material.

As a preference: the double-liquid slurry of cement water glass double-liquid grouting and solid is composed of liquid A and liquid B, and the volume ratio of each component of liquid A and liquid B is 1:1; the liquid A component is ordinary Portland cement and water, the weight ratio of each component of liquid A is: cement 30-50%, and the rest is water; the component of liquid B is water glass and water, and the weight ratio of each component of liquid B is: water glass 45~ 50% and the remainder is water.

As a preference: the grouting slurry used for plugging the gaps between the steel plate, the connecting channel steel pipe sheet and the shield tunnel composite segment is an adaptive expansion slurry, which is composed of liquid A and liquid B. The volume ratio of the components is 1:1; the components of liquid A are expansive cement and water, and the weight ratio of each component of liquid A is: expansive cement 30-50%, and the rest is water; liquid B is water glass and water, the weight ratio of each component of liquid B is: water glass 45-50%, and the rest is water.

As a preference: reinforced concrete ring beams are arranged at the connection between the shield tunnel and the communication channel, and reinforced concrete is arranged at the lower part of the communication channel.

The beneficial effects of the present invention are:

1. The industrial modular processing and production of the plugging steel plate adopted in the present invention has the advantages of convenient installation, less seams, good waterproof effect, and can guarantee the construction progress. In the solution of the present invention, by welding the steel plate waterstop at the deformation joints of the sub-units of the plugging steel plate, the plugging steel plate has the dual effects of rigid waterproofing and external formwork at the same time, and the tunnel waterproofing system implemented according to the method of the present invention is improved. The waterproof performance of the tunnel ensures the construction safety and engineering quality of the tunnel waterproof system and even the entire tunnel project.

2. The self-adaptive expansion slurry used in the present invention has high new early strength, larger later strength growth, and long-term strength rises stably, and because the expansion cement generates high-sulfur hydrated sulfoaluminate (ettringite) in the early stage of hardening, the The double-liquid slurry produces volume expansion, which improves the pore structure of the slurry under constraint conditions, reduces the total porosity, and reduces the capillary pore size, thereby improving the compactness and impermeability of the slurry, which can be reduced to a certain extent. The possibility of leakage at the T-junction between the mechanical communication channel and the shield tunnel.

3. The construction method of the present invention has the advantages of simple operation, strong operability and high construction efficiency.

Description of drawings

Figure 1 is a schematic diagram of the construction of the mechanical method of the communication channel;

Figure 2 is a schematic diagram of the waterproof structure of the T-joint part of the mechanical communication channel;

Figure 3 is a schematic diagram of the connection system between the communication channel and the shield tunnel;

Figure 4 is a schematic diagram of the waterproof structure of the communication channel segment;

Fig. 5 is a schematic diagram of the waterproof structure of the shield tunnel segment;

6 is a schematic diagram of an elastic sealing gasket;

Figure 7 is a cross-sectional view of an elastic sealing gasket;

Description of reference numerals: 1-shield tunnel concrete segment; 2-shield tunnel composite segment; 3-connection system between segments; 4-connection channel steel tube segment; 5-connection channel concrete segment; 6-steel tube segment Grouting hole; 7- sealing bolt; 8- reserved grouting hole for connecting channel segment; 9- superfine cement water glass grouting sealing reinforcement; 10- sulfoaluminate micro-expanded concrete; 11- water-expanding rubber bar; 12-blocking steel plate; 13-reinforced concrete ring beam; 14-rigid reinforcement; 15-waterproof gasket; 16-sealing plate; 17-composite segment concrete segment; 18-foam strip; 19-case Water-swellable rubber gasket; 20-water-swellable gasket; 21-cement-based permeable crystalline coating; 22-water-swellable rubber sheet; 23-EPDM rubber elastic gasket; 24-cement water glass double liquid injection Slurry plus solids; 25 - Reinforced concrete.

Detailed ways

The present invention will be further described below in conjunction with the embodiments. The following examples are illustrative only to aid in the understanding of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Example 1

As shown in Fig. 1 to Fig. 5, the self-adaptive waterproof structure of the T-joint part of the mechanical communication channel is mainly through the installation of an outsourcing waterproof system at the T-joint part of the shield tunnel and the communication channel, and a 7-ring steel-mixed composite pipe of the shield tunnel. Waterproofing of sheet structure and water-stopping of the grouting body behind the wall, waterproofing of the connecting channel segment structure and water-stopping of the grouting body behind the wall, as well as the sealing of the steel plate 12, the steel pipe piece of the communication channel 4, and the composite segment of the shield tunnel 2. The gap is plugged and grouted to form a set of waterproof system for the connection channel and the T-junction of the shield tunnel. Water-swellable rubber strips 11, water-swellable gaskets 20, cement-based permeable crystalline coatings 21, water-swellable rubber strips 11, water-swellable gaskets 20, cement-based permeable crystalline coatings 21, and water-swellable The expanded rubber sheet 22, the EPDM rubber elastic gasket 23 and the sealing bolt 7 are used for secondary grouting on the outer wall of the shield tunnel to form a cement-water glass double-liquid grouting and solid 24, thereby forming the waterproof structure of the shield tunnel system. The communication channel steel pipe sheet 4 is filled with sulfoaluminate micro-expanded concrete 10, and foam strips 18 and water-expandable rubber gaskets 19 are used for connection between the longitudinal and circumferential seams of the communication channel steel pipe sheet 4 and the communication channel concrete segment 5. After the assembly is completed, use the grouting hole 6 of the steel pipe sheet for manual grouting to form an ultra-fine cement water glass grouting sealed solid 9, and use the reserved grouting hole 8 for the communication channel segment for manual grouting. Solid 24 is added to form a cement-water-glass double-liquid grouting.

After the shield tunnel and the communication channel are respectively constructed, the reinforced concrete ring beam 13 and the reinforced concrete 25 are arranged at the T junction of the shield tunnel and the communication channel. The plugging steel plate 12 is sub-unit planning, modularized, assembled, welded on the top, bottom and sides of the communication channel steel pipe sheet 4 . The sealing bolt 7 is used to fix the water-stop gasket 15 and the sealing plate 16 on the inner side of the composite segment concrete segment 17, and the ultra-fine cement-water glass double-liquid adaptive expansion slurry is injected into the gap between the shield tunnel and the communication channel to form an ultra-fine Cement water glass grouting seals and reinforces the solid 9, thereby forming a waterproof system for the T-joint between the shield tunnel and the communication channel.

The sealing steel plate 12 is made of Q235B grade steel, and the watertight seam follows the principle of welding up and down first, then left and right. Butt welding should be fully welded with a 45° groove, and lap welding should be fully welded, using E43XX type electrode for welding. After welding, the surface should be leveled and 100% magnetically inspected. The anti-corrosion coating after welding damage should be repainted with 2 coats of solvent-free ultra-thick epoxy paint. The dimensional tolerance of blanking and cutting of plugging steel plate 12 is controlled within ±1.5mm for manual cutting, within ±1.0mm for automatic semi-automatic cutting, and the verticality is controlled within 2% of the thickness of the steel plate and within ±1.5mm. smooth. Before use, the sealing steel plate 12 is treated to eliminate burrs, oil stains and attachments, and the water-facing surface of the sealing steel plate 12 is painted with inorganic anti-rust paint.

At the junction of the two gaskets on the shield tunnel composite segment 2, the waterproof effect is achieved by the compressive stress generated along the arc length direction after the gasket is compressed and the expansion force generated by the water-expandable rubber when it encounters water. The joint between the shield tunnel composite segment 2 and the shield tunnel concrete segment 1 adopts a water-swellable water-stop glue as a temporary water-stop measure. A 2mm thick water-swellable rubber sheet 22 is pasted on the surface of the ring seam of the shield tunnel composite segment 2, and the position should be close to the steel plate with the water-stop glue. The outer arc surface and the inner arc surface of the joint between the shield tunnel composite segment 2 and the shield tunnel concrete segment 1 shall be coated with cement-based permeable crystalline waterproof coating within 100mm on both sides, and the dosage is 1.5kg/m ² . The water-stop grouting body behind the wall includes cement water glass double-liquid grouting and solid 24 . The segment joint gasket shall meet the technical requirements of non-leakage under the calculated maximum joint opening amount and estimated dislocation amount and 2 to 3 times the water pressure of the buried depth head.

The technical performance indicators of the water-swellable rubber gasket compound 19 (water-retaining strips, water-swellable rubber sheet indicators) are shown in Table 1.

Table 1 Technical performance index of water-swellable rubber gasket compound

The physical and mechanical properties of the water-swellable waterstop glue are shown in Table 2.

Table 2 Physical and mechanical properties of water-swellable waterstop glue

The physical and mechanical properties of the EPDM rubber elastic gasket 23 are shown in Table 3.

Table 3 Physical and mechanical properties of EPDM rubber elastic gasket

The performance indicators of cement-based permeable crystalline waterproof coatings are shown in Table 4.

Table 4 Performance index of cement-based permeable crystalline waterproof coating

Cement water glass double-liquid grouting and solid 24 use two double-liquid grouting pumps for synchronous grouting, and synchronous grouting adopts lag manual grouting. The slurry is cement-water glass slurry, which is injected through the grouting holes reserved in the segment. The injection points are 4 points, the pressure control is less than 0.35MPa, and the injection position is the 4th ring after the current ring; it is received in the shield and the tunnel door is completed. After the interface is installed, in order to fill the voids generated by the shrinkage of the slurry and plug the leakage points, a secondary grouting should be carried out after the completion of the excavation.

A self-adaptive expansion slurry is injected into the gap between the plugging steel plate 12 , the communication channel steel pipe piece 4 and the shield tunnel composite segment 2 to block the gap to form a grouting and sealing reinforcement. The grouting hole set in the channel steel pipe sheet 4 injects self-adaptive expansion double-liquid slurry into the gap between the three. The slurry consists of liquid A and liquid B, and the volume ratio of each component of liquid A and liquid B is 1:1. The components of liquid A are expansive cement and water, and the weight ratio of each component of liquid A is: expansive cement 30-50%, and the rest is water. The components of liquid B are water glass and water, and the weight ratio of each component of liquid B is: water glass 45-50%, and the rest is water. The specific surface area of the expansive cement particles is generally 4800±200cm ² /g, and the free expansion rate of expansive cement is 8-10×10 ^-4 , which can establish a self-stress of 0.1-0.3MPa in the double-liquid slurry, which can satisfy the settlement of the T-joint. , shrinkage requirements; the impermeability grade of expanded cement concrete is greater than S30.

Embodiment 2

The first phase of Ningbo Rail Transit Line 3 is a communication channel between the Southern Business District Station and the Yinzhou District Government Station. The starting mileage from the Southern Business District Station to the Yinzhou District Government Station is ZDK7+794.800, and the end mileage is ZDK8+754.100. The length of the tunnel is about 959.3m. The mileage of the communication channel is ZDK8+214.377, the buried depth here is 16.94m, and the line spacing is 17m. The communication channel is constructed by mechanical method. The diameter of the shield tunnel is 6200mm, the thickness of the segment is 350mm, and 8 grouting holes are arranged around the opening of the communication channel. The excavation diameter of the contact channel is 3290mm, the diameter of the small segment is 3150mm, and the ring width is 550mm. There are 5 grouting holes in each ring of the small segment of the contact channel.

1. Shield tunnel, contact channel segment longitudinal, annular joint waterproof

The segments are assembled with staggered seams. The block of the initial ring (segment) adopts the scheme of one capping block, two adjoining blocks, and three standard blocks—that is, the 5+1 mode. Small capping blocks are used in this section, lap 2/3 radially first, and then push in 1/3 longitudinally for construction.

(1) Gasket waterproof

EPDM rubber elastic gasket 23 and other water-stopping gaskets are used to waterproof the joints of the tunnel segments. The EPDM rubber elastic gasket 23 is pasted in the grooves of the segment gaskets, and the waterproofing is achieved by being compressed and compacted, as shown in the figure. 6 shown.

The material of the elastic gasket is EPDM rubber, which is processed into a frame-shaped rubber ring with clear edges and corners in the factory. The cross-section of the elastic gasket is shown in Figure 7. Before the elastic gasket is pasted in the field, the product must be sent to a qualified testing center for its material inspection.

Apply one-component chloroprene-phenolic adhesive to the grooves of the segment gaskets. Before brushing, the surface of the segment should be dry, the adhesive should be uniform when brushing, and the groove of the gasket should be fully coated. After the adhesive is painted, let it cool for a period of time (10-15min, depending on the temperature and humidity), and when the fingers are not sticky, put the processed frame rubber ring into the groove of the gasket. Before pasting, the gasket should be placed in a drying room of 40℃～60℃ for 36 hours to avoid the deflection and deformation of the gasket. After pasting, the gaskets at the four corners of the segment shall not be shrugged or slumped. The entire gasket surface should be on the same plane, and it is strictly forbidden to skew and twist. The segment shall not be sent downhole for assembly within 12h of pasting and installing the gasket. The sealing pads on both sides of the capping block are coated with surface lubricant before assembly to reduce the friction resistance between the sealing pads when the capping block is inserted.

(2) Caulking waterproof

The caulking operation relies on the filling and adhesion of the caulking material to achieve the purpose of sealing and waterproofing. It is generally required that the caulking material and the base surface have good adhesion (to withstand the hydrostatic pressure of the outer wall of the lining), good elasticity (to adapt to the tunnel deformation), and its material properties must remain stable. When the segment is assembled, the caulking grooves at the corners and edges are sometimes broken, and even the steel bars are exposed in severe cases. In this way, the groundwater will bypass the elastic gasket of the joint and enter the tunnel directly through the crack of the segment, which will cause the steel bar to corrode and affect the structural strength. Repairs should restore damaged segments to their original dimensions, especially the shape and size of the caulking grooves. Use a wire brush to remove the sediment and debris in the caulking groove, and rinse with clean water. The purpose of brushing the interface agent is to make the neoprene latex cement firmly bond with the segment without falling off and without gaps. The interface treatment agent adopts YJ-302 interface treatment agent. The brushing range is the inner wall of the slot, the range of 15mm on both sides of the longitudinal seam and the range of 16mm on both sides of the annular seam. The interface agent for each mixing should be used up within 2 hours.

(3) Node waterproofing

Bolt holes and hoisting holes (grouting holes) in shield tunnels are water-swellable with water-swellable rubber rings. The inner diameter of the rubber ring is 25mm and the outer diameter is 39mm.

(4) Waterproof outside the segment

After the shield tunnel excavation of the contact channel, the dense slurry is injected into the gap manually in time, so as to achieve the purpose of waterproofing outside the segment and controlling the stratum settlement.

(5) Secondary grouting

For the shield tunnel, secondary grouting shall be carried out within 20 rings before and after the left and right lines of the proposed connecting channel. Choose ordinary Portland cement slurry with strong injectability, durability, high stone body strength, no pollution to groundwater and surrounding environment, and relatively low price.

2. Steel pipe sheet to stop water

The steel structure parts of the 6 composite segments at the starting and receiving tunnel gates of the shield tunnel segment are welded together as a whole, and the jump welding method is used to reduce the deformation, and the welding thickness is 3-5mm per layer. The dimensional tolerance of blanking and cutting of plugging steel plate 12 is controlled within ±1.5mm for manual cutting, within ±1.0mm for automatic semi-automatic cutting, and the verticality is controlled within 2% of the thickness of the steel plate and within ±1.5mm. smooth. Before use, do the treatment to eliminate burrs, oil stains and attachments, and apply inorganic anti-rust paint on the water-facing surface of the blocking steel plate 12 . For the gap between the blocking steel plate 12 , the connecting channel steel pipe sheet 4 , and the shield tunnel composite segment 2 , the self-adaptive expansion slurry is injected through the grouting set by the steel pipe sheet to form a grouting sealing and solidifying body to block the gap.

Claims (5)

1. A self-adaptive waterproof structure for the T-joint part of a mechanical communication channel, characterized in that it comprises an outsourcing waterproof system, a shield tunnel composite segment waterproof structure, a water-stop grouting body behind the wall of the shield tunnel, and a contact channel segment waterproofing Water-stop grouting behind the wall of the structure and communication channel; The outsourcing waterproofing system includes blocking steel plates (12) arranged on the bottom plate and top plate of the main tunnel structure and blocking steel plates (12) arranged on both sides of the tunnel main structure, and the sub-units of the blocking steel plates (12) are modularly welded to the communication channel. The top, bottom and sides of the steel tube sheet (4); The shield tunnel composite segment waterproof structure includes a shield tunnel composite segment (2), a shield tunnel concrete segment (1), a composite segment concrete segment (17), and a water-swellable rubber strip (11) for longitudinal joints , water-swellable rubber sheet (22), cement-based permeable crystalline coating (21), water-swellable gaskets for annular seams (20), EPDM elastic gaskets (23), water-stop gaskets (15) ) and sealing plate (16); the surface of the water-swellable rubber strip (11), the water-swellable rubber sheet (22), and the cement-based permeable crystalline coating (21) are closely attached to the shield tunnel composite segment (2), EPDM elastic sealing gaskets (23) are arranged on part of the ring and longitudinal seam of the shield tunnel composite segment (2); On the tunnel composite segment (2); the water-stop grouting body behind the wall of the shield tunnel comprises cement water glass double-liquid grouting and solid (24); The waterproof structure of the communication channel segment includes a communication channel steel tube sheet (4), a communication channel concrete segment (5), a water-expandable rubber gasket (19) and a foam strip (18), a communication channel steel tube sheet (4) and a communication channel A foam strip (18) and a water-expandable rubber gasket (19) are arranged between the longitudinal and circumferential joints of the concrete segment (5); (24) and superfine cement water glass grouting and sealing reinforcement (9); the superfine cement water glass grouting and sealing reinforcement (9) is formed by connecting the composite segment concrete segment (17) with the communication channel steel pipe segment (4) Formed by injecting ultra-fine cement-water glass double-liquid adaptive expansion slurry into the gap; the cross-section of the cement-water glass double-liquid grouting solid (24) is a structure with an obtuse angle; The blocking steel plate (12) subunit welded on the side surface of the steel pipe sheet (4) of the communication channel is attached to the end of the shield tunnel composite pipe sheet (2); the blocking steel plate (12), the communication channel A self-adaptive expansion slurry is injected into the gap between the steel pipe sheet (4) and the shield tunnel composite segment (2), so as to block the gap to form a grouting sealing reinforcement. 2. The self-adaptive waterproof structure for the T-joint part of the mechanical communication channel according to claim 1, characterized in that the water-stop sealing gasket (15) is made of polymer rubber material. 3. The self-adaptive waterproof structure of the T-junction part of the mechanical method communication channel according to claim 1 is characterized in that the double-liquid slurry of cement water glass double-liquid grouting and solid (24) is composed of A liquid and B liquid, and A, The volume ratio of each component of liquid B is 1:1; the component of liquid A is ordinary Portland cement and water, and the weight ratio of each component of liquid A is: cement 30-50%, and the rest is water; B The liquid components are water glass and water, and the weight ratio of each component of liquid B is: water glass 45-50%, and the rest is water. 4. The self-adaptive waterproof structure for the T-joint part of the mechanical method communication channel according to claim 1, characterized in that the blocking steel plate (12), the communication channel steel pipe sheet (4), and the shield tunnel composite segment (2) are three The grouting slurry for plugging the gap between the two parts is self-adaptive expansion slurry, which is composed of liquid A and liquid B. The volume ratio of each component of liquid A and liquid B is 1:1; liquid A is composed of swelling cement and water. The weight ratio of each component of liquid A is: swelling cement 30-50%, and the rest is water; the component of liquid B is water glass and water, and the weight ratio of each component of liquid B is: water glass 45-50% , the remainder is water. 5. The self-adaptive waterproof structure of the T-joint part of the mechanical method communication channel according to claim 1 is characterized in that a reinforced concrete ring beam (13) is arranged at the connection between the shield tunnel and the communication channel, and a reinforced concrete (25) is arranged at the lower part of the communication channel. .

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