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

Mechanical method connecting channel T-shaped junction self-adaptive waterproof structure Download PDF

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CN108825269B
CN108825269B CN201810540216.5A CN201810540216A CN108825269B CN 108825269 B CN108825269 B CN 108825269B CN 201810540216 A CN201810540216 A CN 201810540216A CN 108825269 B CN108825269 B CN 108825269B
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water
liquid
shield tunnel
cement
connection channel
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CN108825269A (en
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刘干斌
朱瑶宏
丁修恒
董子博
周俊宏
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Ningbo Youxin Construction Co ltd
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Ningbo University
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/38Waterproofing; Heat insulating; Soundproofing; Electric insulating
    • E21D11/385Sealing means positioned between adjacent lining members
    • E21D11/386Sealing means positioned between adjacent lining members inflatable sealing means
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/08Lining with building materials with preformed concrete slabs
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal

Abstract

The invention relates to a mechanical method connection channel T-joint part self-adaptive waterproof structure, which comprises an outsourcing waterproof system, a shield tunnel composite segment waterproof structure, a shield tunnel wall rear water-stopping grouting body, a connection channel segment waterproof structure and a connection channel wall rear water-stopping grouting body, wherein the outsourcing waterproof system is arranged on the outer side of a shield tunnel; the outsourcing waterproof system comprises plugging steel plates arranged on a bottom plate and a top plate of the main structure of the tunnel and side wall plugging steel plates arranged on two sides of the main structure of the tunnel, and sub-units of the plugging steel plates are modularly welded on the steel plates of the communication channel; the shield tunnel composite segment waterproof structure comprises a shield tunnel composite segment, a shield tunnel concrete segment, a water-swelling rubber strip of a longitudinal joint, a water-swelling rubber sheet, a cement-based capillary crystalline coating and a water-swelling sealing gasket of a circular joint. The invention has the beneficial effects that: the plugging steel plate is industrially and modularly processed and produced, is convenient to install, has few abutted seams and good waterproof effect, and can ensure the construction progress.

Description

Mechanical method connecting channel T-shaped junction self-adaptive waterproof structure
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 method connection channel and a shield tunnel.
Background
With the rapid development of economy, the transportation industry in China is also advancing at a speed that varies day by day, wherein subways are built in more and more cities. At present, the subway tunnel engineering in China mainly adopts a shallow-buried underground excavation construction method, and in order to guarantee construction quality and construction safety, the water resistance in construction is the greatest importance in the whole construction process, and the water resistance of a subway main body needs to be made. In the subway operation process, the percolating water condition in tunnel is also very general, and its harm is comparatively serious, if can not solve the percolating water problem effectively, then can cause great influence for subway tunnel's whole quality to influence the service life and the security of subway tunnel structure. In waterproofing of a subway tunnel, a construction joint is the weakest part, and thus, waterproofing work for the construction joint is particularly important. In general, a construction joint means a gap in a concrete structure caused by the influence of a construction method or technique. This greatly affects the self-waterproofing effect of the concrete. According to the actual requirements and the design requirements of construction projects, reasonable solutions are adopted to improve the overall quality of the subway tunnel.
The waterproof type of the current subway tunnel can be divided into 3 types, namely, a drainage type, a waterproof type and a drainage-prevention combined type. The waterproof type is a very direct and convenient drainage mode and is widely applied. Because the structural lining is always influenced by water pressure, compared with the other two methods, the anti-seepage performance is not strong, and once water leakage occurs, the problem is difficult to solve; the waterproof and drainage combined type can organically combine the advantages of waterproof and drainage, and although the waterproof is taken as the main part, the water pressure of the structural lining is reduced to a certain extent, so that the possibility of water leakage is greatly reduced, and meanwhile, the subway tunnel drainage engineering does not need to consume excessive cost. When the waterproof type of the subway tunnel is selected, local engineering geology, hydrogeology, subway waterproof grade, environmental requirements and the like are comprehensively considered, and waterproof reliability is met on the premise that drainage does not cause adverse effects on the environment.
In order to solve the problems caused by the construction of the communication channel by the freezing method, research on the communication channel tunneling machine has been carried out successively in Europe, Japan, hong Kong and the like, and mechanical communication channel construction equipment and technology under the technical conditions of non-freezing, small space of a main tunnel, cutting in and out of a hole, complex channel structure and the like are researched and developed.
In recent years, a great deal of research work is done on the aspects of tunnel waterproofing and construction methods at home and abroad, and a patent of application No. 201010277951.5 discloses a construction method of a tunnel waterproofing system, wherein the waterproofing system comprises a bottom plate waterproofing steel plate arranged on a bottom plate of a tunnel main body structure and side wall waterproofing steel plates arranged on two sides of the tunnel main body structure, and the method comprises the steps of modularly processing sub-units of the waterproofing steel plates, constructing a leveling layer of the bottom plate waterproofing steel plate, installing the bottom plate waterproofing steel plates, installing the side wall waterproofing steel plates and performing subsequent operations. Patent application No. 201510724005.3 discloses a tunnel waterproof structure and construction method, the waterproof structure is composed of a water seepage layer and a waterproof layer which are sequentially formed outside a base layer, the waterproof layer is composed of a plurality of waterproof plates, the waterproof layer with the same section is formed by coating a whole waterproof plate, and adjacent waterproof plates along the depth direction of the tunnel are fixed in a lap joint mode.
When the construction method of the tunnel waterproof system disclosed in the prior art is used for large tunnel construction in a region with high water content, the defects of various construction steps, complex method, difficult realization, low construction efficiency, long construction period and considerable safety problem generally exist. Some tunnel waterproofing systems are difficult to ensure the safety of tunnel construction and subsequent use even after the tunnel waterproofing systems are finished.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a T-shaped part self-adaptive waterproof structure of a mechanical method communication channel.
The self-adaptive waterproof structure for the T-joint part of the mechanical connection channel comprises an outsourcing waterproof system, a shield tunnel composite segment waterproof structure, a shield tunnel wall rear water-stopping grouting body, a connection channel segment waterproof structure and a connection channel wall rear water-stopping grouting body;
the outsourcing waterproof system comprises plugging steel plates arranged on a bottom plate and a top plate of the main structure of the tunnel and side wall plugging steel plates arranged on two sides of the main structure of the tunnel, and sub-units of the plugging steel plates are modularly welded on the steel plates of the communication channel;
the waterproof structure of the shield tunnel composite segment comprises a shield tunnel composite segment, a shield tunnel concrete segment, a water-swelling rubber strip for longitudinal joints, a water-swelling rubber sheet, a cement-based permeable crystalline coating, a water-swelling sealing gasket for annular joints, an ethylene propylene diene monomer elastic sealing gasket, a water-stopping sealing gasket and a sealing plate; the surfaces of the water-swelling rubber strip, the water-swelling rubber sheet and the cement-based permeable crystalline coating are closely attached to the composite pipe piece of the shield tunnel, and ethylene propylene diene monomer elastic sealing gaskets are arranged at the rings and the longitudinal joints of the composite pipe piece of the shield tunnel; the water-stopping sealing gasket and the sealing plate are fixed on the shield tunnel composite pipe sheet through sealing bolts; the water-stopping grouting body behind the wall of the shield tunnel comprises a cement-water-glass double-liquid grouting reinforcement body;
the waterproof structure of the connecting channel duct piece comprises a connecting channel steel pipe piece, a connecting channel concrete duct piece, a water-swelling rubber sealing gasket and a foam strip, wherein the foam strip and the water-swelling rubber sealing gasket are arranged between longitudinal and circular seams of the connecting channel steel pipe piece and the connecting channel concrete duct piece; the water-stopping grouting body behind the wall of the communication channel comprises a cement-water-glass double-liquid grouting reinforcing body and a superfine cement-water-glass grouting sealing reinforcing body.
Preferably, the method comprises the following steps: the sealing gasket is completely pressed in the sealing gasket groove, the sectional area of the sealing gasket groove is not smaller than that of the sealing gasket, the depth-to-width ratio of the caulking groove is not smaller than 2.5, the groove depth is 25-55 mm, and the single-side groove width is 5-10 mm.
Preferably, the method comprises the following steps: the water-stopping sealing gasket is made of a high polymer rubber material.
Preferably, the method comprises the following steps: the double-liquid slurry for the cement water glass double-liquid grouting reinforcement body consists of a liquid A and a liquid B, wherein the volume ratio of the components of the liquid A, B is 1: 1; the liquid A comprises ordinary portland cement and water, and the liquid A comprises the following components in parts by weight: 30-50% of cement and the balance of water; the liquid B comprises water glass and water, and the weight ratio of the components of the liquid B is as follows: 45-50% of water glass, and the balance of water.
Preferably, the method comprises the following steps: the slurry for gap plugging grouting among the plugging steel plate, the connecting channel steel pipe sheet and the shield tunnel composite pipe sheet is self-adaptive expansion slurry and consists of liquid A and liquid B, wherein the volume ratio of the components of the liquid A, B is 1: 1; the liquid A comprises the following components in parts by weight: 30-50% of expansive cement and the balance of water; the liquid B comprises water glass and water, and the weight ratio of the components of the liquid B is as follows: 45-50% of water glass, and the balance of water.
Preferably, the method comprises the following steps: the shield tunnel sets up reinforced concrete ring beam with the contact passageway junction, and the contact passageway lower part sets up reinforced concrete.
The invention has the beneficial effects that:
1. the plugging steel plate is industrially and modularly processed and produced, is convenient to install, has few abutted seams and good waterproof effect, and can ensure the construction progress. In the scheme of the invention, the steel plate waterstop is welded at the deformation joint of the sub-unit of the plugging steel plate, so that the plugging steel plate has double effects of rigid waterproofing and an outer template, the waterproofing performance of a tunnel waterproofing system constructed according to the method is improved, and the construction safety and the engineering quality of the tunnel waterproofing system and even the whole tunnel engineering are ensured.
2. The self-adaptive expansion slurry adopted by the invention has high early and new strength, larger later strength increase and stable long-term strength increase, and because the expansion cement generates high-sulfur hydrated sulphoaluminate (ettringite) in the early hardening stage, the double-liquid slurry generates volume expansion, the pore structure of the slurry is improved under the constraint condition, the total porosity is reduced, the capillary pore diameter is reduced, the compactness and the impermeability of the slurry are improved, and the possibility of leakage of the T-joint part of a mechanical method connection channel and a shield tunnel can be reduced to a certain extent.
3. The construction method provided by the invention is simple to operate, strong in operability and high in construction efficiency.
Drawings
FIG. 1 is a schematic illustration of a mechanical tie channel construction;
FIG. 2 is a schematic view of a waterproof structure of a T-junction of a mechanical communication channel;
FIG. 3 is a schematic view of a connection system of a communication channel and a shield tunnel;
FIG. 4 is a schematic view of a waterproof structure of a communication channel segment;
FIG. 5 is a schematic diagram of a shield tunnel segment waterproof structure;
FIG. 6 is a schematic view of an elastomeric seal;
FIG. 7 is a cross-sectional view of the elastomeric seal;
description of reference numerals: 1-shield tunnel concrete segment; 2-shield tunnel composite segment; 3-an inter-segment connection system; 4-connecting channel steel pipe sheets; 5-connecting channel concrete pipe pieces; 6-grouting holes for steel pipe sheets; 7-sealing bolts; 8-reserving grouting holes in the connecting channel pipe pieces; 9-superfine cement water glass grouting sealing reinforcing body; 10-sulphoaluminate micro-expansive concrete; 11-water-swellable rubber strips; 12-plugging a steel plate; 13-reinforced concrete ring beam; 14-a rigid reinforcement; 15-water stop sealing gasket; 16-a sealing plate; 17-composite segment concrete segments; 18-a foam strip; 19-a water-swellable rubber gasket; 20-a water-swellable seal; 21-cementitious capillary crystalline coating; 22-water-swellable rubber sheet; 23-ethylene propylene diene monomer elastic sealing gasket; 24-cement and water glass double-liquid grouting reinforcement; 25-reinforced concrete.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Example one
As shown in fig. 1 to 5, the self-adaptive waterproof structure for the T-joint of the mechanical contact tunnel mainly comprises an outer-wrapping waterproof system, a waterproof and grouting body water-stopping structure for a 7-ring steel-concrete composite segment structure of the shield tunnel, a waterproof and grouting body water-stopping structure for a segment structure of the contact tunnel, a waterproof and grouting body water-stopping structure for a grouting body, and gaps among a plugging steel plate 12, a steel tube segment 4 of the contact tunnel and a composite segment 2 of the shield tunnel to form a waterproof system for the T-joint of the contact tunnel and the shield tunnel. The method is characterized in that water-swelling rubber strips 11, water-swelling gaskets 20, cement-based permeable crystalline coating 21, water-swelling rubber sheets 22, ethylene propylene diene monomer elastic gaskets 23 and sealing bolts 7 are arranged at the relevant positions of a shield tunnel concrete segment 1, a shield tunnel composite segment 2 and an inter-segment connecting system 3, secondary grouting is adopted on the outer wall of the shield tunnel, a cement-water-glass double-liquid grouting reinforcement body 24 is formed, and therefore a waterproof structure system of the shield tunnel is formed. The connection channel steel pipe piece 4 is filled with sulphoaluminate micro-expansion concrete 10, the connection channel steel pipe piece 4 and the connection channel concrete piece 5 are longitudinally arranged, a foam strip 18 is arranged between circular seams, a water-expansion rubber sealing gasket 19 is used for seam water stopping, after the assembly is completed, manual grouting is performed by using the steel pipe piece grouting holes 6 to form the ultra-fine cement-water glass grouting sealing reinforcing body 9, manual grouting is performed by using the connection channel pipe piece reserved grouting holes 8 to form the cement-water glass double-liquid grouting reinforcing body 24.
After the shield tunnel and the connection channel are constructed respectively, a reinforced concrete ring beam 13 and reinforced concrete 25 are arranged at the T-joint part of the shield tunnel and the connection channel. And (4) performing subunit planning on the plugging steel plate 12, modularly processing, assembling and welding the plugging steel plate at the top, the bottom and the side of the steel pipe sheet 4 of the communication channel. A sealing bolt 7 is adopted to fix a water-stop sealing gasket 15 and a sealing plate 16 on the inner side of a composite segment concrete segment 17, and superfine cement-water glass double-liquid self-adaptive expansion slurry is injected into a gap part between the shield tunnel and the communication channel to form a superfine cement-water glass grouting sealing reinforcing body 9, so that a waterproof system of a T-connection part of the shield tunnel and the communication channel is formed.
The plugging steel plate 12 is made of Q235B grade steel and is welded in a watertight manner according to the principle of welding up and down and then welding left and right. And a 45-degree groove is set for butt welding and full welding is set for lap welding, and an E43XX type welding rod is adopted for welding. After welding, the surface should be leveled and 100% magnetic flaw detection is performed. And (3) brushing the solvent-free super-thick epoxy coating again for 2 times on the anticorrosive coating after the welding is damaged. The blanking cutting size tolerance of the plugging steel plate 12 is controlled within +/-1.5 mm of manual cutting, within +/-1.0 mm of automatic semi-automatic cutting, the verticality is controlled within 2% of the thickness of the steel plate, and within +/-1.5 mm, and the cutting periphery is required to be smooth and flat. Before use, the plugging steel plate 12 is treated to remove burrs, oil stains and attachments, and an inorganic antirust coating is coated on the upstream surface of the plugging steel plate 12.
The joint of the two sealing gaskets on the shield tunnel composite duct piece 2 achieves the waterproof effect by means of the pressure stress generated along the arc length direction after the sealing gaskets are pressed and the expansion force generated after the water-swelling rubber meets water. The joint between the shield tunnel composite duct piece 2 and the shield tunnel concrete duct piece 1 adopts water-swelling water-stop glue as a temporary water-stop measure. A2 mm thick water swelling rubber sheet 22 is adhered to the surface of the circular seam of the shield tunnel composite duct piece 2, and a steel plate provided with a water stop glue is tightly attached to the position of the rubber sheet. Outer of shield tunnel composite segment 2 and shield tunnel concrete segment 1 jointThe two sides of the cambered surface and the inner cambered surface are respectively coated with a cement-based capillary crystalline waterproof coating within 100mm, and the dosage is 1.5kg/m2. The post-wall water-stop grouting body comprises a cement-water-glass double-liquid grouting reinforcement body 24. The sealing gasket of the segment joint meets the technical requirement of no leakage under the calculated maximum opening amount of the joint, the estimated dislocation amount and the water pressure 2-3 times of the buried water head.
The technical performance indexes (water bar and water-swelling rubber sheet indexes) of the water-swelling rubber gasket compound 19 are shown in table 1.
TABLE 1 technical Performance indices of water-swelling rubber gasket compounds
Figure GDA0002308112460000051
The physical and mechanical properties of the water-swellable water-stop adhesive are shown in Table 2.
TABLE 2 indexes of physical and mechanical properties of water-swellable adhesive
Figure GDA0002308112460000061
The physical and mechanical properties of the ethylene propylene diene monomer elastic gasket 23 are shown in table 3.
TABLE 3 physical and mechanical properties of EPDM rubber elastic sealing gasket
Figure GDA0002308112460000062
The performance index of the cement-based capillary crystalline waterproof coating is shown in Table 4.
TABLE 4 Cement-based capillary crystalline waterproofing paint performance index
Figure GDA0002308112460000071
The cement-water glass double-liquid grouting reinforcement body 24 is synchronously grouted by 2 double-liquid grouting pumps, and the synchronous grouting is lagged manual grouting. The slurry is cement-water glass slurry, and is injected through a grouting hole reserved in the pipe piece, the injection point position is 4 points, the pressure is controlled to be less than 0.35MPa, and the injection position is 4 rings behind the current ring; after receiving and installing the portal interface by the shield, secondary grouting is carried out for filling gaps and plugging leakage points generated by shrinkage of grout after tunneling is completed, the grout adopts cement-water glass liquid grout, and the pressure is controlled to be less than 0.35MPa in the grouting process.
Self-adaptive expansion slurry is injected into gaps among the plugging steel plate 12, the connecting channel steel pipe sheet 4 and the shield tunnel composite pipe sheet 2 to plug the gaps to form a grouting sealing reinforcing body, the sealing reinforcing body is formed by injecting self-adaptive expansion double-liquid slurry into the gaps among the connecting channel steel pipe sheet 4 through grouting holes formed in the connecting channel steel pipe sheet 4, the slurry comprises A liquid and B liquid, and the volume ratio of the components of the A, B liquid is 1: 1. The liquid A comprises the following components in parts by weight: 30-50% of expansive cement and the balance of water. The liquid B comprises water glass and water, and the weight ratio of the components of the liquid B is as follows: 45-50% of water glass, and the balance of water. The specific surface area of the expanded cement particles generally reaches 4800 +/-200 cm2The free expansion rate of the expansive cement is 8-10 multiplied by 10-4Self-stress of 0.1-0.3 MPa can be established in the double-liquid slurry, and the requirements of settlement and shrinkage of the T-junction position are met; the expansive cement concrete has an impermeability rating greater than S30.
Example two
Ningbo track traffic No. 3 line one project south business district station-37150, state district government station inter-district communication channel, south business district station-37150, state district government station starting point mileage ZDK7+794.800, terminal mileage ZDK8+754.100, tunnel length is about 959.3 m. The mileage of the communication channel is ZDK8+214.377, the burial depth is 16.94m, and the line spacing is 17 m. The connection channel is constructed by a mechanical method. The diameter 6200 of the shield tunnel and the thickness 350 of the pipe piece are arranged, and 8 grouting holes are arranged on the periphery of the connection channel opening. The diameter of the connection channel is 3290mm, the diameter of the small pipe piece is 3150mm, the ring width is 550mm, and 5 grouting holes are distributed in each ring of the small pipe pieces of the connection channel.
1. Longitudinal and circumferential seam water-proof for shield tunnel and connecting channel segment
The assembly of the duct pieces adopts staggered joint assembly. The blocking of the primary building ring (duct piece) adopts a scheme of one capping block, two adjacent blocks and three standard blocks, namely a 5+1 mode. The small top sealing blocks are adopted in the interval, and the construction is carried out by firstly lapping 2/3 in the radial direction and then longitudinally pushing 1/3.
(1) Waterproof gasket
The waterproof of tunnel segment seam adopts EPDM rubber elastic sealing gasket 23 etc. to stop water, pastes EPDM rubber elastic sealing gasket 23 in the segment sealing gasket slot, and is waterproof through it is compressed crowded densely, as shown in figure 6.
The elastic sealing gasket material is ethylene propylene diene monomer, and is processed into a frame-shaped rubber ring with clear edges and corners in a factory, and the cross section of the elastic sealing gasket is shown in detail in figure 7. Before the elastic sealing gasket is attached, the product must be sent to a qualified detection center for material inspection.
And coating a single-component neoprene-phenolic adhesive in the groove of the sealing gasket of the pipe piece. Before brushing, the surface of the pipe piece should be dried, the adhesive should be uniform during brushing, and the groove of the sealing gasket should be fully coated. After the adhesive is coated, the adhesive is cooled for a period of time (10-15 min, which varies with the air temperature and humidity), and when the fingers are not stuck, the processed frame-shaped rubber ring is sleeved in the groove of the sealing gasket. The sealing gasket is placed in a drying room at 40-60 ℃ for drying and shaping for 36 hours before being pasted, so that the sealing gasket is prevented from being bent and deformed. After the sealing gasket is pasted, the phenomena of shoulder rising and shoulder collapse cannot occur on the sealing gaskets at the four corners of the duct piece, and the whole sealing gasket surface is on the same plane, so that the deflection and the distortion are strictly forbidden. The pipe piece is not sent to the underground for assembly in 12h of sticking and installing the sealing gasket. The sealing gaskets on the two sides of the capping block are coated with surface lubricant before assembly, so that the abrasion resistance among the sealing gaskets when the capping block is inserted is reduced.
(2) Caulking waterproof
The caulking operation is to achieve the aim of sealing and waterproofing by the filling and bonding force of caulking materials. It is generally required that the caulking material has good adhesion to the base surface (to withstand the hydrostatic pressure of the lining outer wall), good elasticity (to accommodate tunnel deformation), and its material properties should remain stable. When the duct pieces are assembled, caulking grooves at corners and edges of the duct pieces are cracked sometimes, and reinforcing steel bars are exposed seriously. The elastic sealing gasket of seam will be walked around to launch like this and directly get into the tunnel through the section of jurisdiction crack, causes the reinforcing bar corrosion simultaneously, influences structural strength. When repairing, the damaged duct piece should be repaired to the original size, especially the shape and size of the caulking groove. Removing silt and impurities in the caulking groove by using a steel wire brush, and washing the caulking groove clean by using clear water. The interface agent is coated to ensure that the neoprene latex cement is firmly combined with the pipe piece without falling off and without gaps. The interface treating agent adopts YJ-302 interface treating agent. The brushing range is 15mm range on the inner wall of the slot, 15mm range on both sides of the longitudinal seam and 16mm range on both sides of the circular seam. The interfacial agent should be used up within 2 hours for each mixing.
(3) Node water-proofing
The shield tunnel bolt hole and the hoisting hole (grouting hole) are sealed by a water-swelling rubber ring. The inner diameter of the rubber ring is 25mm, and the outer diameter is 39 mm.
(4) Waterproof outside pipe piece
After the connection channel shield is tunneled, dense slurry is injected into the gap in time through manual work, and the purposes of preventing water outside the segment and controlling stratum settlement are achieved.
(5) Secondary grouting
And (3) performing secondary grouting in the range of 20 rings in front of and behind the left line and the right line of the proposed contact channel aiming at the shield tunnel. The common silicate cement slurry with strong injectability, durability, high strength of the stone body, no pollution to underground water and the surrounding environment and relatively low cost is selected.
2. Steel pipe sheet water stop
The steel structure parts of 6 composite pipe pieces at the starting and receiving tunnel portal of the shield tunnel pipe piece are welded into a whole, the deformation is reduced by adopting a skip welding method, the pipe pieces are welded in multiple layers, and the welding thickness is 3-5 mm for each layer. The blanking cutting size tolerance of the plugging steel plate 12 is controlled within +/-1.5 mm of manual cutting, within +/-1.0 mm of automatic semi-automatic cutting, the verticality is controlled within 2% of the thickness of the steel plate, and within +/-1.5 mm, and the cutting periphery is required to be smooth and flat. Before use, the treatment of eliminating burrs, oil stains and attachments is carried out, and the upstream surface of the plugging steel plate 12 is coated with an inorganic antirust coating. Aiming at the gaps among the plugging steel plate 12, the connecting channel steel pipe piece 4 and the shield tunnel composite pipe piece 2, self-adaptive expansion slurry is injected through grouting arranged on the steel pipe piece so as to plug the gaps to form a grouting sealing reinforcing body.

Claims (5)

1. A self-adaptive waterproof structure for a T-shaped joint of a mechanical connection channel is characterized by comprising an outer waterproof system, a composite segment waterproof structure of a shield tunnel, a water-stopping grouting body behind the wall of the shield tunnel, a water-stopping grouting body behind the segment waterproof structure of the connection channel and a water-stopping grouting body behind the wall of the connection channel;
the outsourcing waterproof system comprises plugging steel plates (12) arranged on a bottom plate and a top plate of the main tunnel structure and plugging steel plates (12) arranged on two sides of the main tunnel structure, and sub-units of the plugging steel plates (12) are modularly welded on the top, the bottom and the side faces of the steel pipe sheet (4) of the communication channel;
the shield tunnel composite segment waterproof structure comprises a shield tunnel composite segment (2), a shield tunnel concrete segment (1), a composite segment concrete segment (17), a longitudinal seam water-swelling rubber strip (11), a water-swelling rubber sheet (22), a cement-based permeable crystalline coating (21), a circular seam water-swelling sealing gasket (20), an ethylene propylene diene monomer elastic sealing gasket (23), a water-stopping sealing gasket (15) and a sealing plate (16); the surfaces of the water-swelling rubber strip (11), the water-swelling rubber sheet (22) and the cement-based permeable crystalline coating (21) are closely attached to the shield tunnel composite segment (2), and ethylene propylene diene monomer elastic sealing gaskets (23) are arranged at partial rings and longitudinal seams of the shield tunnel composite segment (2); the water-stopping sealing gasket (15) and the sealing plate (16) are fixed on the shield tunnel composite segment (2) through the sealing bolt (7); the water-stopping grouting body behind the wall of the shield tunnel comprises a cement-water-glass double-liquid grouting reinforcement body (24);
the connection channel pipe piece waterproof structure comprises a connection channel steel pipe piece (4), a connection channel concrete pipe piece (5), a water-swelling rubber sealing gasket (19) and a foam strip (18), wherein the foam strip (18) and the water-swelling rubber sealing gasket (19) are arranged between longitudinal and circular seams of the connection channel steel pipe piece (4) and the connection channel concrete pipe piece (5); the water-stopping grouting body behind the wall of the communication channel comprises a cement-water-glass double-liquid grouting reinforcement body (24) and a superfine cement-water-glass grouting sealing reinforcement body (9); the superfine cement water glass grouting sealing reinforcing body (9) is formed by injecting superfine cement water glass double-liquid self-adaptive expansion slurry into a gap position between the composite pipe piece concrete pipe piece (17) and the connecting channel steel pipe piece (4); the cross section of the cement glass double-liquid grouting reinforcement body (24) is of an obtuse-angle structure;
the sub-units of the plugging steel plates (12) welded on the side surfaces of the steel pipe pieces (4) of the connecting channels are attached to the ends of the shield tunnel composite pipe pieces (2); self-adaptive expansion slurry is injected into gaps among the plugging steel plate (12), the connecting channel steel pipe piece (4) and the shield tunnel composite pipe piece (2) so as to plug the gaps to form a grouting sealing reinforcing body.
2. The mechanical method communication channel T-junction adaptive waterproof structure as claimed in claim 1, wherein the water-stop sealing gasket (15) is made of a high polymer rubber material.
3. The mechanical method communication channel T-junction adaptive waterproof structure as claimed in claim 1, wherein the double-liquid slurry of the cement-water-glass double-liquid-slurry-injection reinforcing body (24) is composed of liquid A and liquid B, and the volume ratio of the A, B liquid components is 1: 1; the liquid A comprises ordinary portland cement and water, and the liquid A comprises the following components in parts by weight: 30-50% of cement and the balance of water; the liquid B comprises water glass and water, and the weight ratio of the components of the liquid B is as follows: 45-50% of water glass, and the balance of water.
4. The mechanical method connection channel T-junction adaptive waterproof structure as claimed in claim 1, wherein slurry for gap plugging grouting among the plugging steel plate (12), the connection channel steel pipe sheet (4) and the shield tunnel composite pipe sheet (2) is adaptive expansion slurry consisting of liquid A and liquid B, and the volume ratio of the A, B liquid components is 1: 1; the liquid A comprises the following components in parts by weight: 30-50% of expansive cement and the balance of water; the liquid B comprises water glass and water, and the weight ratio of the components of the liquid B is as follows: 45-50% of water glass, and the balance of water.
5. The mechanical method connection channel T-shaped part self-adaptive waterproof structure according to claim 1, characterized in that a reinforced concrete ring beam (13) is arranged at the connection part of the shield tunnel and the connection channel, and reinforced concrete (25) is arranged at the lower part of the connection channel.
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CN110130316A (en) * 2019-05-13 2019-08-16 南京林业大学 The method of thaw collapse after service channel bottom pre-pouring grout system and control freezing construction
CN110410113A (en) * 2019-09-08 2019-11-05 天津大学前沿技术研究院有限公司 A kind of concrete pipe sheet filleting plugging device and method for blocking
CN110608052A (en) * 2019-10-22 2019-12-24 湘潭大学 Tunnel segment based on high-performance cement-based composite material and construction method thereof
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