CN101748755B - Flexible connecting and sealing bitumastic impervious structure of tunnel deformation joint and constructing method - Google Patents
Flexible connecting and sealing bitumastic impervious structure of tunnel deformation joint and constructing method Download PDFInfo
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- CN101748755B CN101748755B CN 200910219478 CN200910219478A CN101748755B CN 101748755 B CN101748755 B CN 101748755B CN 200910219478 CN200910219478 CN 200910219478 CN 200910219478 A CN200910219478 A CN 200910219478A CN 101748755 B CN101748755 B CN 101748755B
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Abstract
The invention belongs to the technical field of anti-seepage construction, and in particular relates to a flexible connecting and sealing bitumastic anti-seepage structure of a tunnel deformation joint and a constructing method, which can ensure the normal use of a subway tunnel under the action of fracture formation of the ground. In the technical scheme, the method comprises the following steps: laying a composite layer of modified asphalt anti-seepage plate, pouring reinforced concrete for lining, setting deformation joints, mounting flexible baffles in the deformation joints, utilizing glass fiber cloth to seal gaps of the baffles, and pouring bitumastics to fill gaps of the deformation joints. The anti-seepage structure constructed in the method has the anti-seepage performance of the composite layer of modified asphalt anti-seepage plate, the extension performance and the anti-seepage performance of the bitumastics, and the blocking function of the flexible baffles. Therefore, the anti-seepage structure can ensure the effective sealing of the joint and prevent the significant water leakage accident while fully adapting to the large-displacement slipping deformation in the positions with the deformation joints of the composite lining structure, and has high economic and social benefits.
Description
Technical field
The invention belongs to building seepage control technique field, be specifically related to a kind of tunnel deformation joint bitumastic and flexibly connect sealing leakage preventing structure and construction method.
Background technology
In the construction of underground structures such as tunnel, often run into complex geological conditions, cause the tunnel to produce differential settlement significantly, cause the big displacement changing of the relative positions of deformation joint both sides liner structure, also have a strong impact on the stability of underground structure simultaneously.Be embodied in subsidiary stress and additional deformation that differential settlement causes structure, and the distortion of underground structure is excessive, will causes its structural deterioration and cause seepage, or cause the destruction of leakage preventing structure and cause seepage.
The validity of the seepage control measure of taking in the differential settlement tunnel structure directly has influence on the reliability of engineering.In the subterranean tunnel engineering, differential settlement causes preliminary bracing to break, thereby lose its water-proof function, a large amount of underground water converge in permanent lining, secondary lining structure and deformation joint thereof along the plane of fracture, this just requires liner structure to prevent cracking, and the antiseepage body that deformation joint is constructed must play good antiseepage effect, otherwise, a large amount of Free water will flow into the tunnel, cause underground traffic to be interrupted.Therefore, the antiseepage body of prevention liner structure cracking and deformation joint lost efficacy, and was most important in construction of tunnel.
At present, the anti-permeation method that the big displacement changing of the relative positions of deformation joint liner structure is adopted is to form the first road antiseepage in the deformation joint reinforced concrete lining layer malformation seam outside by U type rubber fastening band; Twice annulars GINA rubber sealing rod is set along deformation joint liner structure section medial and lateral, but and the solid slurries of filling glue, form the second road antiseepage; At deformation joint Ω type cutoff trench is set along the tunnel lining structure inwall, forms the 3rd road antiseepage.Wherein GINA watertight rubber band is enlarged but the off-load resilience adapts to deformation joint by precommpression; Filling slurries glue solid can be strengthened the sealing function of adhesive bond in the deformation process by slip casting once more; Ω type cutoff trench is convenient to change.Though this method has been taked the multiple tracks seepage control measure, its waterproof effect depends on the degree of deformation joint extensional deformation, and the ability that adapts to the relative alternate displacement of liner structure.If the extensional deformation of deformation joint is bigger, the rubber sealing rod will lose the effect of water-tight, and can the slip casting adhesive bond can not be guaranteed by the sealing of slip casting once more.If alternate displacement is bigger on the cross section, on the side wall U type rubber fastening band may be twisted, stretcher strain, durability reduces; It is poor that Ω type cutoff trench adapts to deformability, needs frequently to change.
Traditional tunnel seepage control measure comprises waterproof concrete, polymer splash guard, asphalt felt, modified asphalt waterproof plate, water-expansible rubber, watertight rubber band, sealing copper coin, sealing copper packing, GINA rubber etc.The preliminary bracing inwall is provided with splash guard, and constuction joint, deformation joint are provided with waterstop, uses waterproof concrete and builds the permanent lining, secondary lining structure, and distortion is provided with the GINA rubber strip in the slit.But when building the tunnel in the ground fissure activity stratum, the relative displacement of ground fissure soil at both sides is unavoidable, and has sustainable development, feature that displacement is big.Reinforced concrete lining layer makes traditional seepage control technique and leakage preventing structure be difficult to satisfy the antiseepage requirement with the big displacement changing of the relative positions of the upper and lower dish soil body in the floor fissure strata tunnel, needs the suitable ground fissure tunnel leakage preventing structure system of exploitation.
Summary of the invention
The purpose of this invention is to provide a kind of tunnel deformation joint bitumastic and flexibly connect sealing leakage preventing structure and construction method, to ensure the normal use of subway tunnel under the floor fissure strata activity.
For achieving the above object, the technical solution used in the present invention is:
The tunnel deformation joint bitumastic flexibly connects the construction method of sealing leakage preventing structure, it is characterized in that, carries out according to the following steps:
Step 1: lay composite layer of modified asphalt anti-seepage plate:
Composite layer of modified asphalt anti-seepage plate is between preliminary bracing lining cutting and reinforced concrete lining layer, it and preliminary bracing lining cutting and reinforced concrete lining layer have constituted the combined type leakage preventing structure, the modified asphalt anti-seepage plate tack coat is formed by SBS modified bitumen waterproof roll liner and glass fiber mesh stack, material with antiseepage ability preferably and ductility, the paving process of the composite layer of modified asphalt anti-seepage plate in ground fissure segment tunnel is: at first carry out the preliminary bracing lining cutting when ground fissure segment tunnel excavation cavitation, then the inner surface of supporting lining cutting in the early stage corresponding to the deformation joint position anchoring composite layer of modified asphalt anti-seepage plate of reinforced concrete lining layer in preliminary bracing lining cutting inwall, the reservation width of deformation joint is 10cm～15cm, composite layer of modified asphalt anti-seepage plate is made up of about 10 tack coats, the about 5-6cm of thickness, the about 40-50cm of length wraps deformation joint and expands 15-20cm along the tunnel to both sides;
Step 2: the reinforced concrete lining layer of cast deformation joint both sides:
Position according to deformation joint in the step 1, the slit of reserving width and be 10cm～15cm is as deformation joint, the end of pouring into a mould adjacent reinforced concrete lining layer then in the deformation joint both sides of reserving, reserve the slip casting duct in the concrete placement, and according to deformation joint both sides concrete lining sedimentation size respectively at the pre-buried steel seat in upper and lower half hole, be used for fixing built-in telescopic baffle; The inner wall surface of the ring that composite layer of modified asphalt anti-seepage plate constitutes in reinforced concrete lining layer outer wall surface and the step 1 contacts, and reserving gaps is a deformation joint;
Step 3: substep is installed the extension type baffle plate:
The extension type baffle plate is fixed on the reinforced concrete lining layer of having poured into a mould with bolt, the permanent position of extension type baffle plate in the reinforced concrete lining layer of deformation joint both sides is corresponding to the pre-buried position of steel seat, in the position that upper and lower half hole extension type baffle plate is connected, carry out the overlap joint of certain-length, lap length is 100cm, causes after the floor fissure strata large deformation after the deformation joint changing of the relative positions two baffle plates still can wrap up to close the slit to adapt to;
Step 4: wrap up glass fabric in the extension type baffle plate outside:
Is the inboard that the glass fiber of 10cm～15cm (wide with deformation joint) is arranged in deformation joint with thickness for the 2mm width, and be wrapped in the outside of extension type baffle plate, play the gap of sealing deformation joint and extension type baffle plate, the effect of outflowing by the gap when preventing the bitumastic cast; When the extension type baffle plate is installed along the segmentation of deformation joint inwall, form cavity, be used for segmentation asphalting matizhi by composite layer of modified asphalt anti-seepage plate, reinforced concrete lining layer, glass fabric and extension type baffle plate;
Step 5: asphalt reperfusion matizhi antiseepage body:
Substep asphalt reperfusion matizhi material forms bitumastic antiseepage body in the deformation joint in deformation joint.
Above-mentioned modified asphalt anti-seepage plate tack coat is formed by SBS modified bitumen waterproof roll liner and glass fiber mesh stack, has antiseepage ability preferably and ductility.
The concrete steps of above-mentioned casting reinforced concrete lining cutting end are: in the template of reserving gaps both sides erecting, and fluid concrete, reserve the slip casting duct in the casting process, the pre-buried steel seat along the reinforced concrete lining layer inside edge, the steel seat is embedded in second big hole of deformation joint both sides liner structure sedimentation and first little hole of sedimentation respectively, and fluid concrete solidifies the reinforced concrete lining layer that the back forms the deformation joint both sides.
The width of the deformation joint of above-mentioned reservation is 10cm～15cm.
The anti-filling of above-mentioned bitumastic is in the deformation joint gap, form the cutoff collar in the deformation joint, and with outer ring around the composite layer of modified asphalt anti-seepage plate inner structural wall and the reinforced concrete lining layer end of deformation joint both sides have tight bond, has durable sealing, the antiseepage body of bitumastic cast has significant extension performance, can adapt to the differential settlement large deformation of reinforced concrete lining layer structure.
The installation of above-mentioned extension type baffle plate is divided into two kinds of forms: the extension type baffle plate in second hole is fixed on the bigger reinforced concrete lining layer structure of sedimentation, and the extension type baffle plate in first hole is fixed on the less reinforced concrete lining layer structure of sedimentation; In the position that upper and lower half hole extension type baffle plate is connected, carry out the overlap joint of certain-length, lap length is 100cm, still can wrap up and closes the deformation joint slit to adapt to after the floor fissure strata large deformation internal baffle.
Above-mentioned extension type baffle plate is to be welded together to form a steel frame by " L " shaped steel matter holder and rigidity outer baffle, then high-strength spring and built-in telescopic baffle are linked together and be installed in the rigidity outer baffle, form the extension type baffle plate, the front end of baffle plate has an expansion plate lock pin, can when being installed, built-in telescopic baffle control the collapsing length of high-strength spring and the extension of built-in telescopic baffle, be convenient to the installation of extension type baffle plate, the size of built-in telescopic baffle is 50cm * 8cm * 1cm, the design decrement 8cm of high-strength spring, purpose is after treating that spring is installed, spring still has elastic force when the deformation joint slit increases, the extension type baffle plate can be pushed up on the end face of opposite side lining cutting of deformation joint, the extension type baffle plate is convenient to change, the installation initial stage requires the Internal baffle stroke to be not less than 3cm, along with the distortion of deformation joint axial tension changes, the baffle plate of replaceable bigger stroke is so that satisfy the change in displacement of deformation joint.
Above-mentioned leakage preventing structure comprises the composite layer of modified asphalt anti-seepage plate between preliminary bracing lining cutting and reinforced concrete lining layer; Reserve deformation joint between the concrete reinforcement concrete lining, filling bitumastic between the deformation joint of both sides reinforced concrete lining layer forms bitumastic antiseepage body, forms ring along the distortion slit; The anti-antiseepage body of bitumastic is by glass fabric and the composite layer of modified asphalt anti-seepage plate inwall and the reinforced concrete lining layer tight bond of extension type baffle plate and parcel; When the ground fissure activity causes composite layer of modified asphalt anti-seepage plate and bitumastic antiseepage body part the space to occur, can safeguard by reserving the additional grouting of injected hole.
The present invention is with respect to prior art, and its beneficial effect is:
1, between tunnel preliminary bracing and permanent lining, secondary lining, sets up composite layer of modified asphalt anti-seepage plate, formed the first road seepage control measure of permanent lining, secondary lining structure.Composite layer of modified asphalt anti-seepage plate has good impermeability and self sealss, utilize its good water resistance, the a large amount of Free water that prevent preliminary bracing from breaking in the changing of the relative positions of differential settlement stratum and cause influx the secondary liner structure deformation joint, play the antiseepage effect.Composite layer of modified asphalt anti-seepage plate has significant rheological characteristic, utilizes its good rheological performance, the crack that produces in the deformation process that can heal automatically.Composite layer of modified asphalt anti-seepage plate is made up of compound glass fleece and modified asphalt anti-seepage plate stack, slippage relatively between the barrier sheet composite bed, can adapt to the stretcher strain of deformation joint both sides concrete lining structure, combine with its self sealss and can bring into play the better waterproof energy.Modified asphalt anti-seepage plate has significant anti-corrosion function, prevents that corrosive substance from corroding reinforced concrete lining layer and the reinforced concrete lining layer that causes destroys, and has further ensured the normal operation of subway.
2, asphalt reperfusion matizhi in the deformation joint of reinforced concrete lining layer structure, it and permanent lining, secondary lining structure impervious concrete have formed the second road seepage control measure.This material has good thermosol flowability, is convenient to build slit, space, can form the antiseepage body of sealing; Have stronger ductility and caking property, can adapt to the large deformation of the seam of reinforced concrete lining layer malformation under the floor fissure strata changing of the relative positions condition, possess the bonds well ability of stretchings, shearing condition antiseepage body and liner structure end down and outside the deformation joint; Have good rheological characteristic, can be in long-term deformation process the self-healing crack.
3, liner structure deformation joint inboard is provided with the extension type baffle plate, and the one side is fixed in the reinforced concrete lining layer end, and opposite side can freely slide, and can adapt to the big relatively displacement changing of the relative positions of lining cutting.Extension type baffle plate rigidity is big, can stop bitumastic to produce the rheology distortion under the head effect in the hole.
Description of drawings
Fig. 1 flexibly connects sealing leakage preventing structure vertical section schematic diagram for deformation joint bitumastic of the present invention;
Fig. 2 is an extension type baffle arrangement of the present invention vertical section schematic diagram;
Fig. 3 is the vertical section schematic diagram after the big displacement changing of the relative positions distortion of leakage preventing structure deformation joint of the present invention;
Fig. 4 is the big sedimentation liner structure sectional schematic diagram of deformation joint of the present invention;
Fig. 5 is the less sedimentation liner structure of a deformation joint of the present invention sectional schematic diagram;
Among the last figure, 1-reinforced concrete lining layer, 2-preliminary bracing lining cutting, the 3-composite layer of modified asphalt anti-seepage plate, 4-glass fabric, 5-bitumastic antiseepage body, 6-extension type baffle plate, 7-anchor pole, 8-slip casting duct, the 9-deformation joint, 10-steel seat, 11-" L " shaped steel matter holder, the 12-bolt, 13-high-strength spring, the built-in telescopic baffle of 14-, 15-expansion plate lock pin, 16-rigidity outer baffle.
The specific embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
The construction method of the deformation joint anti-seepage structure that the present invention adopts, carry out according to the following steps:
Step 1: lay composite layer of modified asphalt anti-seepage plate 3.
As shown in Figure 1, when ground fissure segment tunnel excavation cavitation, at first carry out preliminary bracing lining cutting 2, then 2 inner surfaces of supporting lining cutting in the early stage corresponding to reinforced concrete lining layer deformation joint 9 position anchoring composite layer of modified asphalt anti-seepage plate 3 on preliminary bracing lining cutting 2 inwalls, the reservation width of deformation joint 9 is 10cm～15cm, the barrier sheet tack coat is formed by SBS modified bitumen waterproof roll liner and glass fiber mesh stack, composite bed is made up of about 10 tack coats, the about 5-6cm of thickness, the about 40-50cm of length wraps deformation joint 9 and expands 15-20cm along the tunnel to both sides.Then in composite layer of modified asphalt anti-seepage plate 3 inner surface casting reinforced concrete lining cutting 1.
Step 2: the reinforced concrete lining layer 1 of cast deformation joint 9 both sides.
According to the position of deformation joint in the step 19, adjacent reinforced concrete lining layer 1 is poured into a mould in deformation joint 9 both sides of reserving then as deformation joint in the slit of reserving width and be 10cm～15cm.
The concrete steps of cast are: in the template of reserving gaps both sides erecting, and fluid concrete, reserve slip casting duct 8 in the casting process, along the pre-buried steel seat 10 in reinforced concrete lining layer 1 inside edge.Steel seat 10 is embedded in second big hole of deformation joint 9 both sides liner structure sedimentations and first little hole of sedimentation respectively.Fluid concrete solidifies the reinforced concrete lining layer 1 that the back forms the deformation joint both sides.
The inner wall surface of the ring that composite layer of modified asphalt anti-seepage plate 3 constitutes in reinforced concrete lining layer 1 outer wall surface and the step 1 contacts, and reserving gaps is a deformation joint 9.
Step 3: substep is installed extension type baffle plate 6.
Pour into a mould good reinforced concrete lining layer 1 according to step 2, extension type baffle plate 6 is fixed on the reinforced concrete lining layer of having poured into a mould 1 with bolt 12.The permanent position of extension type baffle plate 6 in the reinforced concrete lining layer 1 of deformation joint 9 both sides is corresponding to the pre-buried position of steel seat 10.As shown in Figure 4 and Figure 5, in the position that upper and lower half hole extension type baffle plate 6 is connected, carry out the overlap joint of certain-length, lap length is 100cm, causes after the floor fissure strata large deformation after the deformation joint changing of the relative positions two baffle plates still can wrap up to close the slit to adapt to.
Extension type baffle plate 6 is to be welded together to form a steel frame by " L " shaped steel matter holder 11 and rigidity outer baffle 16, and high-strength spring 13 and built-in telescopic baffle 14 are linked together is installed in the rigidity outer baffle 16 then, forms extension type baffle plate 6.The front end of baffle plate has an expansion plate lock pin 15, can be when built-in telescopic baffle 14 be installed the collapsing length of control high-strength spring 13 and the extension of built-in telescopic baffle 14, be convenient to the installation of extension type baffle plate 6.The size of built-in telescopic baffle 14 is 50cm * 8cm * 1cm, the design decrement 8cm of high-strength spring 13, purpose is that spring still had elastic force when deformation joint 9 slits increase after spring was installed, and extension type baffle plate 6 can be pushed up on the end face of opposite side lining cutting of deformation joint 9.Extension type baffle plate 6 is convenient to change, and the installation initial stage requires the Internal baffle stroke to be not less than 3cm, and along with the distortion of deformation joint axial tension changes, the baffle plate of replaceable bigger stroke is so that satisfy the change in displacement of deformation joint 9.
Step 4: at extension type baffle plate 6 outsides parcel glass fabric 4.
As shown in Figure 2, is the inboard that the glass fabric 4 of 10cm～15cm (wide with deformation joint) places deformation joint 9 with thickness for the 2mm width, and be wrapped in the outside of extension type baffle plate 6, play the gap of sealing deformation joint 9 and extension type baffle plate 6, the effect of outflowing by the gap when preventing the bitumastic cast.
When extension type baffle plate 6 is installed along deformation joint 9 inwall segmentations, formed cavity, be used for segmentation asphalting matizhi by composite layer of modified asphalt anti-seepage plate 3, reinforced concrete lining layer 1, glass fabric 4 and extension type baffle plate 6.
Step 5: asphalt reperfusion matizhi antiseepage body 5.
Substep asphalt reperfusion matizhi material forms bitumastic antiseepage body 5 in deformation joint 9.
The bitumastic material is by pitch and the formulated according to a certain percentage new material of breeze, has anti-seepage effect preferably.This material normal temperature becomes runny liquid state to be easy to perfusion when temperature is heated to 180 ℃ down for solid-state.
The leakage preventing structure that adopts the inventive method to construct at the tunnel lining deformation joint, as shown in Figure 1.This leakage preventing structure comprises the composite layer of modified asphalt anti-seepage plate 3 of ground fissure influence section and the pitch water chestnut fat antiseepage body 5 of deformation joint.Composite layer of modified asphalt anti-seepage plate 3 just has anti-seepage effect preferably with the combined type leakage preventing structure itself that reinforced concrete lining layer 1 is formed; Pitch water chestnut fat antiseepage body 5 is filled in the deformation joint gap, lining cutting end of deformation joint 9 both sides, plays main antiseepage effect.Reinforced concrete lining layer 1 is positioned on the both sides end face of deformation joint 9, the inboard pre-buried steel seat 10 of both sides end face, be used to install extension type baffle plate 6, slip casting duct 8 is respectively reserved in deformation joint 9 both sides, after being used for floor fissure strata motion and causing deformation joint generation changing of the relative positions distortion, in deformation joint 9, inject impervious material and fill issuable space, thereby further ensure the anti-seepage effect of leakage preventing structure.
Extension type baffle plate 6 and confining bed glass fabric 4 in the lining cutting leakage preventing structure that employing the inventive method is constructed, as shown in Figure 2.When asphalt reperfusion matizhi material, play the effect of mould bases, can guarantee the smooth moulding of bitumastic material; When the both sides of deformation joint reinforced concrete lining layer 1 produces alternate displacement owing to floor fissure strata motion, extension type baffle plate 6 can keep out well the bitumastic material because of the effect of hydraulic pressure contingent in the hole trend of bulging.
Vertical section structure after the big displacement changing of the relative positions distortion of the lining cutting leakage preventing structure that adopts the inventive method to construct, as shown in Figure 3: relative displacement takes place in the reinforced concrete lining layer 1 of deformation joint both sides, and deformation joint 9 is filled in extension type Internal baffle 6 sealings of bitumastic inboard in bitumastic antiseepage body 5 in the composite layer of modified asphalt anti-seepage plate 3 in the outside, the deformation joint and the deformation joint.
Construction method of the present invention in the structure of tunnel lining deformation joint anti-seepage structure, has adopted to belong to viscoelastoplastic material in floor fissure strata, has the modified asphalt anti-seepage plate and the bitumastic of characteristics such as good impermeability, shock resistance, durability and ductility.Add composite layer of modified asphalt anti-seepage plate 3 in reinforced concrete lining layer 1 outside, increased the anti-seepage effect of lining cutting itself, and preliminary bracing lining cutting 2 and reinforced concrete lining layer 1 flexibility are joined, can significantly improve the anti seismic efficiency of lining cutting internal force and enhancing lining cutting integral body; Bitumastic packing material between lining cutting has anti-seepage effect preferably, is the core body in the composite lining leakage preventing structure, and the extension better performances of this material can adapt to the big displacement changing of the relative positions distortion of lining cutting under the ground fissure effect well; Extension type baffle plate 6 has assistant formation and keeps out the effect that bitumastic overflows, at first be that scalable Internal baffle 6 can guarantee the 5 smooth moulding of bitumastic antiseepage body well, next is when the ground fissure activity causes lining cutting end, deformation joint both sides that the big displacement changing of the relative positions takes place, the local attenuation of bitumastic material owing to be out of shape, bulging takes place easily under the effect of underground flood peak in the hole and extrude, extension type baffle plate 6 can be kept out the trend of overflowing of bitumastic effectively, keeps the whole anti-seepage effect of deformation joint bitumastic material preferably.
Claims (6)
1. the tunnel deformation joint bitumastic flexibly connects the construction method of sealing leakage preventing structure, it is characterized in that, carries out according to the following steps:
Step 1: lay composite layer of modified asphalt anti-seepage plate (3):
Composite layer of modified asphalt anti-seepage plate (3) is positioned between preliminary bracing lining cutting (2) and the reinforced concrete lining layer (1), it and preliminary bracing lining cutting (2) and reinforced concrete lining layer (1) have constituted the combined type leakage preventing structure, composite layer of modified asphalt anti-seepage plate (3) is formed by SBS modified bitumen waterproof roll liner and glass fiber mesh stack, material with antiseepage ability preferably and ductility, the paving process of the composite layer of modified asphalt anti-seepage plate (3) in ground fissure segment tunnel is: at first carry out preliminary bracing lining cutting (2) when ground fissure segment tunnel excavation cavitation, then supporting lining cutting in the early stage (2) inner surface corresponding to deformation joint (9) the position anchoring composite layer of modified asphalt anti-seepage plate (3) of reinforced concrete lining layer (1) in preliminary bracing lining cutting (2) inwall, the reservation width of deformation joint is 10cm～15cm, composite layer of modified asphalt anti-seepage plate (3) is made up of 10 tack coats, thickness 5-6cm, length 40-50cm wraps deformation joint (9) and expands 15-20cm along the tunnel to both sides;
Step 2: the reinforced concrete lining layer (1) of cast deformation joint both sides:
Position according to deformation joint in the step 1 (9), the slit of reserving width and be 10cm～15cm is as deformation joint (9), pour into a mould the end of adjacent reinforced concrete lining layer (1) then in deformation joint (9) both sides of reserving, reserve slip casting duct (8) in the concrete placement, and according to deformation joint (9) both sides concrete lining sedimentation size respectively at the pre-buried steel seat in upper and lower half hole (10), be used for fixing built-in telescopic baffle (14);
The inner wall surface of the ring that composite layer of modified asphalt anti-seepage plate (3) constitutes in reinforced concrete lining layer (1) outer wall surface and the step 1 contacts, and reserving gaps is deformation joint (9);
Step 3: substep is installed extension type baffle plate (6):
Extension type baffle plate (6) is fixed on the reinforced concrete lining layer of having poured into a mould (1) with bolt (12), the permanent position of extension type baffle plate (6) in the reinforced concrete lining layer (1) of deformation joint (9) both sides is corresponding to the pre-buried position of steel seat (10), in the position that upper and lower half hole extension type baffle plate (6) is connected, carry out the overlap joint of certain-length, lap length is 100cm, causes after the floor fissure strata large deformation after the deformation joint changing of the relative positions two baffle plates still can wrap up to close the slit to adapt to;
Step 4: wrap up glass fabric (4) in extension type baffle plate (6) outside:
With thickness for the 2mm width be 10cm～15cm and with place the inboard of deformation joint (9) with the wide glass fabric (4) of deformation joint, and be wrapped in the outside of extension type baffle plate (6), play the gap of sealing deformation joint (9) and extension type baffle plate (6), the effect of outflowing by the gap when preventing the bitumastic cast;
When extension type baffle plate (6) is installed along deformation joint (9) inwall segmentation, form cavity by composite layer of modified asphalt anti-seepage plate (3), reinforced concrete lining layer (1), glass fabric (4) and extension type baffle plate (6), be used for segmentation asphalting matizhi;
Step 5: asphalt reperfusion matizhi antiseepage body (5):
Substep asphalt reperfusion matizhi material forms deformation joint (9) interior bitumastic antiseepage body (5) in deformation joint (9).
2. tunnel deformation joint bitumastic according to claim 1 flexibly connects the construction method of sealing leakage preventing structure, and it is characterized in that: in the described step 2, the concrete steps of casting reinforced concrete lining cutting (1) end are:
Template at reserving gaps both sides erecting, and fluid concrete, reserve slip casting duct (8) in the casting process, along reinforced concrete lining layer (1) the pre-buried steel seat in inside edge (10), steel seat (10) is embedded in second big hole of deformation joint (9) both sides liner structure sedimentation and first little hole of sedimentation respectively, and fluid concrete solidifies the reinforced concrete lining layer (1) that the back forms the deformation joint both sides.
3. tunnel deformation joint bitumastic according to claim 1 flexibly connects the construction method of sealing leakage preventing structure, it is characterized in that, described bitumastic filling is in deformation joint (9) gap, form the cutoff collar in the deformation joint, and with outer ring around composite layer of modified asphalt anti-seepage plate (3) inner structural wall and reinforced concrete lining layer (1) end of deformation joint (9) both sides have tight bond, has durable sealing, the antiseepage body of bitumastic cast has significant extension performance, can adapt to the differential settlement large deformation of reinforced concrete lining layer (1) structure.
4. tunnel deformation joint bitumastic according to claim 1 flexibly connects the construction method of sealing leakage preventing structure, it is characterized in that, the installation of described extension type baffle plate (6) is divided into two kinds of forms: the extension type baffle plate (6) in second hole is fixed on the bigger reinforced concrete lining layer of sedimentation (1) structure, and the extension type baffle plate (6) in first hole is fixed on the less reinforced concrete lining layer of sedimentation (1) structure; In the position that upper and lower half hole extension type baffle plate (6) is connected, carry out the overlap joint of certain-length, lap length is 100cm, still can wrap up and closes the deformation joint slit to adapt to after the floor fissure strata large deformation internal baffle.
5. tunnel deformation joint bitumastic according to claim 1 flexibly connects the construction method of sealing leakage preventing structure, it is characterized in that, described extension type baffle plate (6) is to be welded together to form a steel frame by " L " shaped steel matter holder (11) and rigidity outer baffle (16), then high-strength spring (13) and built-in telescopic baffle (14) are linked together and be installed in the rigidity outer baffle (16), form extension type baffle plate (6), the front end of baffle plate has an expansion plate lock pin (15), the collapsing length of control high-strength spring (13) and the extension of built-in telescopic baffle (14) when built-in telescopic baffle (14) is installed, be convenient to the installation of extension type baffle plate (6), the size of built-in telescopic baffle (14) is 50cm * 8cm * 1cm, the design decrement 8cm of high-strength spring (13), purpose is after treating that spring is installed, spring still has elastic force when the deformation joint slit increases, extension type baffle plate (6) can be pushed up on the end face of opposite side lining cutting of deformation joint (9), extension type baffle plate (6) is convenient to change, the installation initial stage requires extension type baffle plate (6) stroke to be not less than 3cm, along with the distortion of deformation joint axial tension changes, change the extension type baffle plate (6) of bigger stroke, so that satisfy the change in displacement of deformation joint.
6. the leakage preventing structure of constructing according to the described method of claim 1, it is characterized in that: this leakage preventing structure comprises the composite layer of modified asphalt anti-seepage plate (3) that is positioned between preliminary bracing lining cutting (2) and the reinforced concrete lining layer (1); Reserve deformation joint (9) between the reinforced concrete lining layer (1), filling bitumastic between the deformation joint of both sides reinforced concrete lining layer (1) forms bitumastic antiseepage body (5), forms ring along the distortion slit; Bitumastic antiseepage body (5) is by the glass fabric (4) and composite layer of modified asphalt anti-seepage plate (3) inwall and reinforced concrete lining layer (1) tight bond of extension type baffle plate (6) and parcel; When the ground fissure activity causes composite layer of modified asphalt anti-seepage plate (3) and bitumastic antiseepage body (5) when the space appears in the part, safeguard by reserving the additional grouting of injected hole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200910219478 CN101748755B (en) | 2009-12-14 | 2009-12-14 | Flexible connecting and sealing bitumastic impervious structure of tunnel deformation joint and constructing method |
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| CN 200910219478 CN101748755B (en) | 2009-12-14 | 2009-12-14 | Flexible connecting and sealing bitumastic impervious structure of tunnel deformation joint and constructing method |
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