CN103924987B - A kind of SMW engineering method stake tunnel shielding portal seepage-proof structure and construction method thereof - Google Patents
A kind of SMW engineering method stake tunnel shielding portal seepage-proof structure and construction method thereof Download PDFInfo
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Abstract
The invention provides a kind of SMW engineering method stake tunnel shielding portal seepage-proof structure and construction method thereof.The construction of described seepage-proof structure is as follows: after constructed in the position at the corresponding shield structure hole of agent structure AT STATION or after the main structure construction of whole station completes, welded steel double reinforced mesh in portal steel loop, and pump concreting forms one temporary plugging wall with sealing mould employing, when station agent structure and temporary plugging wall reach design strength, the SMW engineering method stake of corresponding shield tunnel hole part is holed along H profile steel wall and inserts igelite mini-valve tube, use sleeve valve barrel grouting technique in H profile steel jack, synchronously inject cement grout in the H profile steel pulling up this position simultaneously and form cement packed layer.Structure of the present invention is simple, easy construction, can well prevent the percolating water phenomenon at shield tunnel hole, reduce the security risk of shield machine export & import, shortens SMW engineering method stake H profile steel leasing period, saves construction cost.
Description
Technical field
The present invention relates to Soft Soil Layer Shield-bored tunnels hole preventing water leakage technology, specifically a kind of when adopting the space enclosing structure of SMW engineering method stake as shield tunnel end well, for shield tunnel portal reinforcing anti-seepage water-bound and construction method thereof.
Background technology
The stake of SMW engineering method is that the compound inserting shaped steel formation in the triaxial cement mixing pile of socket continuously keeps off native water-stopping structure, original soil is reinforced the form of construction work once becoming wall, construction technology is simple, duration is shorter, under the prerequisite not reclaiming shaped steel, its expense going along with sb. to guard him itself is only 70% of diaphragm wall, if consider the recovery of shaped steel, expense can drop to less than 60%.Although shaped steel Soil-cement Wall has had good economic benefit and social benefit, but it is domestic always to the mechanism of action, the research of design theory shortage of this engineering method, shortage can the shaped steel Soil-cement Wall design specifications of foundation and theoretical writings, and Shaped steel recovery difficulty etc. problem, constrain shaped steel Soil-cement Wall applying in China, but the use of SMW engineering method stake is relatively extensive.
The stake of SMW engineering method being used in the space enclosing structure of the starting of shield tunnel, destination vertical shaft has been more common construction method, the stake of SMW engineering method is specifically adopted to be gone along with sb. to guard him at the shield tunnel starting station, then excavation is built a station, after the starting station is built up, again the H profile steel in the stake of SMW engineering method is extracted, and the H profile steel at corresponding shield tunnel hole place continues to be retained in pile body the effect of going along with sb. to guard him playing tunnel portal, when shield machine adjacent piles hole, just the H profile steel in hole place concrete stake is extracted.Adopt in this way, the H profile steel at shield tunnel hole needs to be detained in pile body for a long time, general constructing tunnel at least needs to stop half a year, even more than 1 year can be stopped for some special construction plants, because existing work progress H profile steel is generally the mode adopting lease, so just, greatly can increase rent, improve construction cost; In addition, after the H profile steel in stake being extracted, just can reserve a cavity equal with H profile steel volume in pile body, underground water just can infiltrate along cavity, causes shield tunnel hole to seep water phenomenon, increases shield machine export & import potential safety hazard.
Summary of the invention
The present invention according to existing subway foundation pit SMW engineering method stake foundation pit enclosure structure, shield tunnel end well reinforcing body, between reinforcing body and space enclosing structure gap processing method and SMW engineering method stake H profile steel rise pull out reclaim after seepage water problem, provide a kind of and improve SMW engineering method stake tunnel shielding portal seepage-proof structure and construction method thereof.The shield tunnel portal percolating water structure improved is simple, and its Construction on Environment is polluted less, hydrological geological conditions is with strong points, and improves shield structure export & import safety factor, shortening H profile steel leasing period, reduces construction cost.
Technical scheme provided by the invention: described a kind of SMW engineering method stake tunnel shielding portal seepage-proof structure comprises the SMW engineering method stake space enclosing structure of shield end well, shield end ruggedized construction is provided with in the outside of the corresponding shield tunnel notch portion of SMW engineering method stake space enclosing structure, it is characterized in that: this seepage-proof structure also comprises the temporary plugging wall being arranged on shield tunnel hole place, described temporary plugging wall is made up of the reinforced mesh and the concrete dense sealing be cast on reinforced mesh being fixed on hole; Pull up in process in the H profile steel of the corresponding shield tunnel notch portion of SMW engineering method stake space enclosing structure and in H profile steel jack, form the cement packed layer identical with H profile steel shape by the mode of synchronous grout injection.
The further technical scheme of the present invention: SMW engineering method stake space enclosing structure with form triple-pipe high pressure jet grouting stake by the mode of triple-pipe high pressure jet grouting in the gap between shield end ruggedized construction and be engaged body of wall.
The present invention is technical scheme preferably: described temporary plugging wall thickness 600-800mm, is provided with two-layer reinforced mesh, and the edge of two-layer reinforced mesh is all welded in the portal steel loop at shield tunnel hole.
The present invention is technical scheme preferably: described shield end ruggedized construction is triaxial cement mixing pile reinforcing body.
The construction method of a kind of SMW engineering method stake tunnel shielding portal seepage-proof structure provided by the invention, its concrete steps are as follows:
The invention provides a kind of construction method of SMW engineering method stake tunnel shielding portal seepage-proof structure, its concrete steps are as follows:
(1) laggard driving station main structure construction is completed in the SMW engineering method stake space enclosing structure of shield end well foundation ditch and the construction of conventional soil cement stirring body shield end well reinforcing body, the mode that shield end well reinforcing body adopts three axes agitating pile to combine with triple-pipe high pressure jet grouting stake is constructed, construct afterwards (body of wall namely around the installation of portal steel loop and portal) or after the main structure construction of whole station completes in the position at agent structure corresponding shield structure hole AT STATION, welded steel double reinforced mesh in portal steel loop, and use form for seal portal, adopt ground pump to concreting on reinforced mesh, reinforced mesh is covered completely, template is taken away after concrete setting, just at shield tunnel interruption-forming one temporary plugging wall,
(2) when the temporary plugging wall in station agent structure and step (1) has been constructed and has reached design strength, start to pull up the H profile steel in SMW engineering method stake space enclosing structure, first the H profile steel in the pile body of SMW engineering method stake space enclosing structure corresponding body of wall position, station is directly extracted, before pulling up the SMW engineering method stake H profile steel of corresponding shield tunnel hole part, first form about two unobstructed cement injections along the transverse plate two side walls of the H profile steel in this pile body respectively to pile body bottom hole from each pile body upper surface at this position and draw hole, two cement injections on each pile body draw the steel wall being close to H profile steel in hole, and make after this H profile steel extracts, cement injection on this pile body draws hole and inserts with this H profile steel the jack formed at pile body after pile body and be communicated with,
(3) after treating that step (2) completes, just start to pull up the H profile steel in the SMW engineering method stake of corresponding shield tunnel hole part, pull up in process in the H profile steel of every root SMW engineering method stake uses sleeve valve barrel grouting technique to draw hole to simultaneous implantation cement grout in H profile steel jack in this pile body by cement injection simultaneously, when H profile steel in pile body is extracted completely, fill cement grout in its H profile steel jack simultaneously, after cement grout is solid, just one is formed with the stake of SMW engineering method, after all H profile steel pull up, the H profile steel jack of corresponding shield tunnel hole part each SMW engineering method stake is all filled up by cement grout, form the body of wall completed together.Wherein sleeve valve barrel grouting technique specific practice is: draw in hole to each slip casting while step (2) is holed and pour into closed mud, and insert the igelite mini-valve tube of one-way sealing, mud to be closed solidifies in backward igelite mini-valve tube and inserts sealing slip casting core pipe, connect grouting pipeline, just start to pull up the H profile steel in the SMW engineering method stake of corresponding shield tunnel hole part, to pull up in process in the H profile steel of every root SMW engineering method stake and inject cement grout by slip casting core pipe and merogenesis moves slip casting core pipe simultaneously, when H profile steel in pile body is extracted completely, fill cement grout in its H profile steel jack simultaneously, after cement grout is solid, just one is formed with the stake of SMW engineering method, igelite mini-valve tube rests in pile body, wherein the Main Function of one-way sealing mini-valve tube ensures that slurries distinguish level by the requirement of regulation, and ensure that slurries only spray from valve pipe, and prevent adverse current from entering in valve pipe, for secondary even repeatedly slip casting create conditions, and in slip casting process, certain stabilization can be played to the soil body.
The present invention is further comprising the steps of: after step (3) completes, shield machine arrives first 2 months of tunnel portal, and the stake of employing triple-pipe high pressure jet grouting penetrates the gap between micro-artesian aquifer process reinforcing body and SMW engineering method piling wall body, and to get multiple diameter after triple-pipe high pressure jet grouting stake reaches design strength on portal temporary plugging wall be 2-3cm level detection hole, at least six, be evenly distributed on temporary plugging wall, each level detection hole depth enters in cement-soil reinforcing body, and judge to reinforce waterproof quality by the infiltration phenomenon of eye-level exploration hole, if the infiltration of reinforcing waterproof quality not achievement level exploration hole will be more serious, if there is situation not up to standard, just the mode of igelite mini-valve tube secondary grouting is taked, or the position, gap again between employing triple-pipe high pressure jet grouting stake process reinforcing body and SMW engineering method piling wall body.
The stake of SMW engineering method bores pick mixer with fountain type to carry out brill pick to certain depth at the scene, simultaneously at drill bit place ejection cement system hardening agent with foundation soil mix and blend repeatedly, overlapping lapping construction is then taked between each construction cell, then cement-soil mixture do not tie hard before insertion H profile steel or steel plate as its stress reinforcing material, hard to cement knot, just formed and there is some strength and rigidity, continuous whole, jointless underground wall body together.What SMW engineering method was the most frequently used is that three spindle-type bore pick mixer.
Beneficial effect of the present invention:
1. the present invention is before the H profile steel in SMW engineering method stake safeguard structure is extracted in main structure construction after completing AT STATION, first formed at shield tunnel portal and see provisional protection wall, this protecting wall can protect shield tunnel hole, all H profile steel in SMW engineering method stake safeguard structure can be extracted together, this protecting wall can play the effect of supporting protection to hole part, described SMW engineering method stake space enclosing structure body of wall H profile steel rises pulls out time advance, what decrease shield tunnel hole place H profile steel buries the time underground, reduce the tenancy duration of this position H profile steel, thus saving construction cost,
2. provisional protection wall of the present invention is formed by steel mesh reinforcement and concrete, its construction is simple, with low cost, and two-layer steel mesh reinforcement is set, add its stablizing effect, steel mesh reinforcement is laid inside shield end well, when shield machine is about to arrive this position, steel mesh reinforcement can be chiseled, also can not affect the normal shield structure of shield machine, pull out synchronous grouting for H profile steel rises enclosed environment is provided, and reduce the shield machine export & import risk because portal percolating water causes;
3. the present invention is before the H profile steel in the SMW engineering method stake safeguard structure extracting corresponding shield tunnel hole place, the outer wall being close to H profile steel from every pile body upper end is holed downwards, and introduce igelite mini-valve tube, while extracting H profile steel, in the cavity of pile body script placement H profile steel, cement grout is injected by this pipeline, filling H profile steel rises pulls out rear space, blocking groundwater seepage passage, it is so a complete seal chamber that safeguard structure after H profile steel is extracted is appointed, avoid occurring percolating water phenomenon, too increase the stability of this safeguard structure simultaneously, every pile body cavity is filled up, and igelite mini-valve tube can be placed in pile body, do not affect shield machine export & import cutterhead normally to tunnel,
Structure of the present invention is simple, geological condition is with strong points, easy construction, low in the pollution of the environment, the percolating water phenomenon at shield tunnel hole can well be prevented, reduce the security risk of shield machine export & import, shorten SMW engineering method stake H profile steel leasing period, save construction cost, realize the doulbe-sides' victory of economy, environmental benefit.
Accompanying drawing explanation
Fig. 1 is End Shaft at Underground Metro Station space enclosing structure and tunnel shielding portal reinforcing body floor map;
Fig. 2 is end well and shield tunnel longitudinal plane structure schematic diagram;
Fig. 3 is that H profile steel rises and pulls out synchronous grouting mini-valve tube and draw hole burial place schematic diagram;
Fig. 4 buries H profile steel underground to work the pile body top view after pulling out synchronous grouting mini-valve tube;
Fig. 5 is the pile body sectional drawing be not in the milk after extracting H profile steel;
Fig. 6 is the pile body top view pouring into cement grout after extracting H profile steel;
Fig. 7 is the plan view of shield tunnel door seal wall;
Fig. 8 is the longitudinal sectional drawing of shield tunnel door seal wall.
In figure: 1-subway station shield launching arrives end well, 2-SMW engineering method stake space enclosing structure, 3-H profile steel, 4-shield end ruggedized construction, 5-triple-pipe high pressure jet grouting stake occlusion body of wall, 6-shield tunnel, 7-temporary plugging wall, 7-1-reinforced mesh, 7-2-concrete dense sealing, 8-portal steel loop, 9-cement packed layer, 10-mini-valve tube, 11-cement grout draws hole, 12-H profile steel jack.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further illustrated, in Fig. 1, described a kind of SMW engineering method stake tunnel shielding portal seepage-proof structure, comprise the SMW engineering method stake space enclosing structure 2 of shield end well, SMW engineering method stake space enclosing structure 2 adopts a construction technique of SMW engineering method stake to complete, shield end ruggedized construction 4 is provided with in the outside of the corresponding shield tunnel notch portion of SMW engineering method stake space enclosing structure 2, the reinforcing mode that shield end ruggedized construction 4 adopts three axes agitating pile to combine with triple-pipe high pressure jet grouting stake, it is characterized in that: this seepage-proof structure also comprises the temporary plugging wall 7 being arranged on shield tunnel hole place, as shown in Figure 6, described temporary plugging wall 7 is made up of the reinforced mesh 7-1 and the concrete dense sealing 7-2 be cast on reinforced mesh being fixed on hole, as shown in Figure 7, described temporary plugging wall 7 thickness is 600mm, be provided with two-layer reinforced mesh, the edge of two-layer reinforced mesh is all welded in the portal steel loop 8 at shield tunnel hole, then adopt and add template and formed by the mode of ground pump concreting, pull up in process in the H profile steel of the corresponding shield tunnel notch portion of SMW engineering method stake space enclosing structure 2 and in H profile steel jack, form the cement packed layer 9 identical with H profile steel shape by the mode of synchronous grout injection, its grouting mode is before H profile steel pulls up, as shown in Figure 3, the both sides of H profile steel intermediate lateral plate are close to respectively to pile body bottom hole from each pile body upper end, form a cement injection and draw hole, then the igelite mini-valve tube inserting one-way sealing is drawn in hole in the mud slip casting of each pile body, and in igelite mini-valve tube, insert slip casting core pipe, while pulling up H profile steel, in H profile steel jack, cement grout is injected by slip casting core pipe, when H profile steel pulls up completely, fill cement grout in H profile steel jack simultaneously, just cement packed layer 9 is formed after cement grout solidifies, SMW engineering method stake space enclosing structure 2 with form triple-pipe high pressure jet grouting stake by the mode of triple-pipe high pressure jet grouting in the gap between shield end ruggedized construction 4 and be engaged body of wall 5.
Below in conjunction with embodiment, the technical scheme in the present invention is clearly and completely described.
Embodiment: the present embodiment is specifically stood as individual layer station with certain city Line 2 Metro A, end well place, station adopts SMW engineering method stake space enclosing structure, and end well foundation depth is 11.9m, the long 21.4m of stake, engineering method stake H profile steel insertion depth 9.6m, inserts than 0.81.End well reinforces the Scheme of Strengthening adopting three axes agitating pile to combine with triple-pipe high pressure jet grouting stake, reinforces volume 9m (along line direction width) × 21.4m (along headwall direction length) × 12.2m (degree of depth).A stands western end well using the tune of unit in charge of construction's shield machine of standing as B and starting well use, and A station 70m end well agent structure binds in by the end of July, 2010 in, plans to start space enclosing structure SMW engineering method stake H profile steel mid-August and pulls out.The factor impacts such as B station changes because pipeline moves, shield machine could arrive A station end well in by the end of December, 2012 after starting in B station in.As conveniently construction technology, shield machine carries out H profile steel before arriving A station end well portal and pulls out, then the close slotting H profile steel in end well position needs burying 16 months underground in space enclosing structure, as agreed, H profile steel is exceeded the time limit rent at least 40 ten thousand yuan, and adopt conventional construction technique also to occur drainage, affect the normal shield structure of shield machine.
Unit in charge of construction and designing unit adopt the construction method of SMW engineering method stake tunnel shielding portal seepage-proof structure of the present invention for this reason, and its concrete steps are as follows:
(1) unit in charge of construction's SMW engineering method stake space enclosing structure of shield end well foundation ditch of standing at A and the construction of conventional soil cement stirring body shield end well reinforcing body start to carry out station main structure construction after completing, and after A station station main structure construction completes, welded steel double reinforced mesh in the portal steel loop of B station to the shield tunnel hole at A station, and use form for seal portal, adopt ground pump to concreting on reinforced mesh, reinforced mesh is covered completely, template is taken away after concrete setting, just be 600mm temporary plugging wall at shield tunnel interruption-forming one thickness,
(2) when the temporary plugging wall in station agent structure and step (1) has been constructed and has reached design strength, just the H profile steel in other SMW engineering method stake in space enclosing structure of being stood by A except the pile body of portal position is directly extracted, then specially treated is carried out for the SMW engineering method stake of portal position, specifically form about one unobstructed cement injection in each pile body upper surface along the wall of the H profile steel transverse plate both sides in this pile body to pile body bottom hole and draw hole, and guarantee that two cement injections on each pile body draw hole after extracting this H profile steel, can insert with this H profile steel the jack formed at pile body after pile body to be communicated with, then the igelite mini-valve tube of the one-way sealing inserted for injecting cement grout is drawn in hole at each cement injection, and in igelite mini-valve tube slip casting core pipe
(3) after treating that step (2) completes, just start to pull up the H profile steel in the SMW engineering method stake of corresponding shield tunnel hole part, pull up in process in the H profile steel of every root SMW engineering method stake uses sleeve valve barrel grouting technique to draw hole to simultaneous implantation cement grout in H profile steel jack in this pile body by cement injection simultaneously, not only block seepage water passage in space enclosing structure body of wall, and the material of igelite mini-valve tube 8 does not affect shield machine export & import cutter head of shield machine rotation excavation operation, its three mini-valve tube can repeat slip casting, slip casting is protected after completing, later stage can supplement slip casting, when H profile steel in pile body is extracted completely, in its H profile steel jack, fill cement grout simultaneously, after cement grout is solid, just form one with the stake of SMW engineering method, after the H profile steel in each pile body is extracted, in the H profile steel jack in each pile body, fill cement grout simultaneously, after cement grout is solid, has been convenient to pile body and forms one envelope wall, the effect of waterproofing reinforcement can be played,
(4) after step (3) completes, shield machine arrived end well before 2 months, adopt triple-pipe high pressure jet grouting stake to carry out consolidation process to the 400mm gap between end well space enclosing structure 2 and cement mixing method reinforcing body 4, in gap, form triple-pipe high pressure jet grouting stake occlusion body of wall.
After having constructed and inject cement grout reach design strength after, piercing 10 diameters from temporary plugging wall is 2-3cm level detection hole, ten exploration holes are uniformly distributed, and each exploration hole is drilled into the position of shield end reinforcing body, observe through long-time, do not find infiltration phenomenon, illustrate that the structure percolation-proof effect in embodiment is good, and H profile steel in the pile body having extracted SMW engineering method stake corresponding shield structure hole part in construction in advance, shorten the lease time of this position H profile steel, construction cost can be controlled within 60,000 yuan, not only cost-saving, and improve shield machine export & import safety factor.
Geological condition of the present invention is with strong points, construction technology is simple, low in the pollution of the environment, reduce the security risk of shield machine export & import, shorten SMW engineering method stake H profile steel leasing period, save construction cost, realize the doulbe-sides' victory of economy, environmental benefit.
Claims (8)
1. a SMW engineering method stake tunnel shielding portal seepage-proof structure, comprise SMW engineering method stake space enclosing structure (2) of shield end well, shield end ruggedized construction (4) is provided with in the outside of the corresponding shield tunnel notch portion of SMW engineering method stake space enclosing structure (2), it is characterized in that: this seepage-proof structure also comprises the temporary plugging wall (7) being arranged on shield tunnel hole place, described temporary plugging wall (7) is made up of the reinforced mesh (7-1) and the concrete dense sealing (7-2) be cast on reinforced mesh being fixed on hole; Pull up in process in the H profile steel of SMW engineering method stake space enclosing structure (2) corresponding shield tunnel notch portion and in H profile steel jack (12), form the cement packed layer (9) identical with H profile steel shape by the mode of synchronous grout injection.
2. a kind of SMW engineering method stake tunnel shielding portal seepage-proof structure according to claim 1, is characterized in that: form triple-pipe high pressure jet grouting stake by the mode of triple-pipe high pressure jet grouting in the gap between SMW engineering method stake space enclosing structure (2) with shield end ruggedized construction (4) and be engaged body of wall (5).
3. a kind of SMW engineering method stake tunnel shielding portal seepage-proof structure according to claim 1 and 2, it is characterized in that: the thick 600-800mm of described temporary plugging wall (7), be provided with two-layer reinforced mesh, the edge of two-layer reinforced mesh is all welded in the portal steel loop (8) at shield tunnel hole.
4. a kind of SMW engineering method stake tunnel shielding portal seepage-proof structure according to claim 1 and 2, is characterized in that: described shield end ruggedized construction (4) is triaxial cement mixing pile reinforcing body.
5. a construction method for SMW engineering method stake tunnel shielding portal seepage-proof structure, its concrete steps are as follows:
(1) laggard driving station main structure construction is completed in the SMW engineering method stake space enclosing structure of shield end well foundation ditch and the construction of conventional soil cement stirring body shield end well reinforcing body, after constructed in the position at the corresponding shield structure hole of agent structure AT STATION or after the main structure construction of whole station completes, welded steel double reinforced mesh in the portal steel loop at shield tunnel hole, and use form for seal portal, adopt ground pump to concreting on reinforced mesh, reinforced mesh is covered completely, template is taken away after concrete setting, just at shield tunnel interruption-forming one temporary plugging wall,
(2) when the temporary plugging wall in station agent structure and step (1) has been constructed and has reached design strength, start to pull up the H profile steel in SMW engineering method stake space enclosing structure, before pulling up the SMW engineering method stake H profile steel of corresponding shield tunnel hole part, first form about one unobstructed cement injection from each pile body upper surface at this position along the H profile steel wall in this pile body to pile body bottom hole and draw hole, cement injection on each pile body draws the steel wall that H profile steel is close in hole, and after guaranteeing to extract this H profile steel, cement injection draws hole and inserts with this H profile steel the jack formed at pile body after pile body and be communicated with,
(3) after treating that step (2) completes, just start to pull up the H profile steel in the SMW engineering method stake of corresponding shield tunnel hole part, pull up in process in the H profile steel of every root SMW engineering method stake uses sleeve valve barrel grouting technique to draw hole to simultaneous implantation cement grout in H profile steel jack in this pile body by cement injection simultaneously, when H profile steel in pile body is extracted completely, fill cement grout in its H profile steel jack simultaneously, after cement grout is solid, just form one with the stake of SMW engineering method.
6. the construction method of a kind of SMW engineering method stake tunnel shielding portal seepage-proof structure according to claim 5, further comprising the steps of after step (3) completes: to arrive first 2 months of tunnel portal at shield machine, the stake of employing triple-pipe high pressure jet grouting penetrates the gap between micro-artesian aquifer process reinforcing body and SMW engineering method piling wall body; And to get multiple diameter after triple-pipe high pressure jet grouting stake reaches design strength on portal block wall be 2-3cm level detection hole, each level detection hole depth enters in cement-soil reinforcing body, and judge to reinforce waterproof quality by the infiltration phenomenon of eye-level exploration hole, as reinforced the waterproof quality mode taking igelite mini-valve tube secondary grouting not up to standard, or again adopt the position, gap between triple-pipe high pressure jet grouting stake process reinforcing body and SMW engineering method piling wall body.
7. the construction method of a kind of SMW engineering method stake tunnel shielding portal seepage-proof structure according to claim 5, it is characterized in that: each pile body is drilled with two cement injections in step (2) and draws hole, two cement injections draw hole and are separately positioned on H profile steel transverse plate both sides.
8. the construction method of a kind of SMW engineering method stake tunnel shielding portal seepage-proof structure according to claim 5, it is characterized in that: in step (3), mini-valve tube grouting process first in the cement injection hole of having bored, pours into closed mud, and insert the igelite mini-valve tube of one-way sealing, mud to be closed solidifies in backward igelite mini-valve tube and inserts sealing slip casting core pipe, connect grouting pipeline, inject cement grout merogenesis moves slip casting core pipe by slip casting core pipe, treat cement injection complete after igelite mini-valve tube rest in pile body.
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