CN113338947B - Water-rich sand layer anti-flowing sand water-surge working well and construction method thereof - Google Patents
Water-rich sand layer anti-flowing sand water-surge working well and construction method thereof Download PDFInfo
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- CN113338947B CN113338947B CN202110401247.4A CN202110401247A CN113338947B CN 113338947 B CN113338947 B CN 113338947B CN 202110401247 A CN202110401247 A CN 202110401247A CN 113338947 B CN113338947 B CN 113338947B
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- 238000010276 construction Methods 0.000 title claims abstract description 32
- 239000004576 sand Substances 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 29
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 98
- 239000010959 steel Substances 0.000 claims abstract description 98
- 239000002689 soil Substances 0.000 claims abstract description 41
- 230000002787 reinforcement Effects 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 20
- 239000004567 concrete Substances 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims abstract description 10
- 239000013013 elastic material Substances 0.000 claims abstract description 6
- 239000011381 foam concrete Substances 0.000 claims description 15
- 239000003365 glass fiber Substances 0.000 claims description 15
- 239000004744 fabric Substances 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 239000002985 plastic film Substances 0.000 claims description 6
- 229920006255 plastic film Polymers 0.000 claims description 6
- 238000009412 basement excavation Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005553 drilling Methods 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims 1
- 238000003756 stirring Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining 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
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention relates to a water-rich sand layer anti-sand water-surge working well and a construction method thereof, wherein the working well structure comprises an underground continuous wall and a grid cement soil wall arranged at an inlet and outlet side of the underground continuous wall, the underground continuous wall comprises a reinforcement cage made of reinforcement and concrete poured in the reinforcement cage, an embedded steel ring and an embedded bolt are circumferentially arranged at the inner side of the reinforcement cage, an annular waterproof ring is arranged at the inner side of the underground continuous wall, water-swelling rubber is arranged between the annular waterproof ring and the embedded steel ring, the annular waterproof ring is fixed with the embedded steel ring through a steel pressing plate and the embedded bolt, the annular waterproof ring is made of an elastic material, and the inner diameter of the annular waterproof ring is smaller than the outer diameter of a jacking pipe so that the annular waterproof ring is clung to the jacking pipe and deforms along the advancing direction of the jacking pipe.
Description
Technical Field
The invention relates to the technical field of construction engineering, in particular to a water-rich sand layer water-flow-sand-surge-preventing working well and a construction method thereof.
Background
Pipe construction technology has been rapidly developed in China in recent years and is widely applied to underground passage engineering and comprehensive pipe gallery engineering. The pipe jacking method is used as a non-grooving construction method, and has the greatest advantage that a non-grooving underground excavation mode is adopted, so that the direct influence of the operation on the ground building or structure is avoided. At present, the domestic jacking pipe size is generally smaller than 3600mm, most of the jacking pipe is round, geological hydrologic conditions in most areas are good, and construction risks are low; but as an underground excavation method, the construction of the large-section special-shaped jacking pipe in the water-rich and weak stratum belongs to high-risk operation, a tunnel portal is in a continuous starting state in the jacking process of the jacking pipe, the water and soil loss is extremely easy to occur due to the fact that the tunnel portal is extremely high in water and sand gushing risks due to the influences of engineering geology, hydrology, structural size, jacking length and the like, the ground subsidence is caused, bad social influence is generated, and in addition, in the construction, casualties and property loss are often caused due to sudden accidents, so that the engineering progress is very influenced. Therefore, the technical research of the anti-surging technology of the pipe jacking construction portal in the special stratum has become the problems of difficulty, key point and hot spot of the development of the large-section special-shaped pipe jacking.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a water-rich sand layer water-inflow-prevention working well with good waterproof effect and low construction risk, the working well structure comprises an underground diaphragm wall and a grid cement soil wall arranged at the inlet and outlet sides of the underground diaphragm wall, the underground diaphragm wall comprises a reinforcement cage made of reinforcement and concrete poured in the reinforcement cage, an embedded steel ring and embedded bolts are circumferentially arranged at the inner side of the reinforcement cage, an annular waterproof ring is arranged at the inner side of the underground diaphragm wall, water-swelling rubber is arranged between the annular waterproof ring and the embedded steel ring, the annular waterproof ring is fixed with the embedded steel ring through a steel pressing plate and the embedded bolts, the annular waterproof ring is made of an elastic material, the inner diameter of the annular waterproof ring is smaller than the outer diameter of the top pipe, so that the annular waterproof ring is clung to the top pipe and deforms along the advancing direction of the top pipe, the annular waterproof ring is made of the elastic material, and the annular waterproof ring is driven to deform along the advancing direction by stretching the extrusion force when the annular waterproof ring is in and out, and the waterproof ring can be prevented from penetrating into a working gap between the underground water and the top pipe opening; the annular waterproof ring is installed and fixed on the embedded steel ring by using the steel pressing plate and the water-swelling rubber, so that the waterproof ring has a good waterproof effect and is very firm.
As a preferable scheme, the grid cement-soil wall adopts a multi-layer grid type, and the cement-soil wall is at least partially and closely arranged on the upper part of the outer wall of the underground diaphragm wall; the setting mode in this technical scheme can carry out the reinforcement on a large scale to the entrance to a cave soil body on the one hand to have better water-proof effects, prevent that surrounding groundwater from going into the push pipe business turn over entrance to a cave deeply.
As a preferable scheme, a layer of the grating cement soil wall clung to the underground continuous wall is inserted with a straight steel sheet pile; in the technical scheme, the supporting capability and water stopping are provided for the hole after the hole is broken and before the jacking pipe enters and exits the hole, and the straight steel sheet pile is pulled out during the construction of the hole entering and exiting.
As a preferable scheme, a plurality of grouting pipes are arranged on the side, close to the inlet and outlet of the working well, of the grid cement soil wall; the grouting pipe is arranged in the technical scheme, so that grouting blocking can be performed when the hole leaks water.
As the preferred scheme, this work well entrance to a cave department is square and has arranged glass fiber reinforcement and foam concrete, prevents to harm pre-buried steel ring and pre-buried bolt, glass fiber reinforcement both ends and underground diaphragm wall's reinforcing bar overlap joint setting, and glass fiber reinforcement and foam concrete of this technical scheme easily manual breaking can prevent to harm pre-buried steel ring and pre-buried bolt when breaking the hole.
As the preferable scheme, the embedded steel ring and the embedded bolt are wrapped and protected by a plastic film, damage to the embedded part is avoided, and the hole opening and the embedded part are conveniently cleaned at the hole opening.
As the preferable scheme, the cross section of the embedded steel ring is L-shaped, and the effect of fixing the annular waterproof ring is better.
As a preferable scheme, the grouting pipe is a steel pipe wrapping filter cloth, and grouting holes are formed in the steel pipe.
The invention also provides a construction method of the water-rich sand layer anti-flowing sand water-surge working well, which comprises the following steps:
s1, constructing a grid cement soil wall: a grating cement-soil wall is arranged on one side of a pipe jacking in-out hole of the working well by adopting a cement-soil mixing pile machine, is of a multi-layer cement-soil wall structure, partially surrounds the underground continuous wall of the working well, and has a depth exceeding a certain depth of the hole opening of the working well;
s2, installing a straight steel sheet pile and a grouting pipe: inserting a straight steel sheet pile into a layer of wall of the grid cement soil wall close to the working well, wherein the straight steel sheet piles are overlapped through a lock catch to form a curtain, and the insertion depth of the straight steel sheet pile exceeds a certain depth of a hole; inserting a plurality of grouting pipes at two sides of an opening between the straight steel sheet piles and the underground continuous wall, wherein the insertion depth of the grouting pipes exceeds a certain depth of the opening; the grouting pipe is a steel pipe wrapped with filter cloth, and small holes are fully punched on the steel pipe within the depth range of the hole as grouting holes.
S3, binding an underground continuous wall reinforcement cage: glass fiber ribs are adopted at the positions of the pipe jacking in and out of the tunnel, and two ends of each glass fiber rib are overlapped with the corresponding steel bars and fixed by U-shaped clamps; and welding and fixing the embedded steel ring and the embedded bolt in the underground diaphragm wall reinforcement cage at the position of the pipe jacking in-out hole, and wrapping the surfaces of the embedded steel ring and the embedded bolt by using a plastic film.
S4, pouring an underground continuous wall: carrying out grooving operation on the underground continuous wall by using a grooving machine, lowering a reinforcement cage after grooving, and then pouring concrete; when the concrete of the groove width where the hole is located is poured, firstly pouring concrete, then pouring foam concrete in the hole area, and finally pouring concrete.
S5, working well excavation: and excavating the working well to a designed elevation after the underground diaphragm wall concrete reaches the designed strength, and then sealing the bottom.
S6, manually breaking the hole: before the jacking pipe enters the tunnel, firstly manually breaking foam concrete at the opening of the tunnel, taking care of protecting the embedded steel ring and the embedded bolt when breaking the foam concrete, removing the protecting film and cleaning the surfaces of the embedded steel ring and the embedded bolt.
S7, installing an annular waterproof ring: firstly, a layer of water-swelling rubber is arranged on an embedded steel ring, then an annular waterproof ring is arranged, and then a layer of steel pressing plate is arranged and fixed through embedded bolts.
And S8, if water leakage and sand surging occur after the hole is broken, grouting and reinforcing are carried out by using a grouting pipe.
S9, jacking pipe entering: the straight steel sheet pile is pulled out, cement soil wall damage caused by pulling out the steel sheet pile is reinforced by grouting of a grouting pipe, and a jacking pipe enters into drilling from a hole opening or exits from the opposite direction and penetrates out from the center of the annular waterproof ring to drive the annular waterproof ring to deform so as to play a role in waterproof; by adopting the construction method, the construction risk is reduced, the phenomena of water burst and sand burst are avoided, and the construction time is saved.
Drawings
Fig. 1 is a plan view of the structure of the present invention.
Fig. 2 is a cross-sectional view of the present invention.
Fig. 3 is a schematic structural view of the installation of the annular waterproof ring.
Fig. 4 is an elevation view of the structure of the present invention.
Wherein, 1, underground continuous wall; 2. grid cement soil wall; 3. reinforcing steel bars; 4. concrete; 5. embedding a steel ring; 6. embedding bolts; 7. an annular waterproof ring; 8. a water-swellable rubber; 9. a steel pressing plate; 10. jacking pipes; 11. a straight steel sheet pile; 12. grouting pipe; 13. an opening; 14. glass fiber ribs; 15. foam concrete.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, it should be understood that the positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. are based on the positional relationship shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the method or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," "held," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be the communication of the inner sections of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1 to 4, the embodiment of the invention provides a water-rich sand layer anti-running sand water-gushing working well with good waterproof effect and low construction risk, the working well structure comprises an underground diaphragm wall 1 and a grid cement soil wall 2 arranged at the inlet and outlet sides of the underground diaphragm wall 1, the underground diaphragm wall 1 comprises a reinforcement cage made of reinforcement 3 and concrete 4 poured in the reinforcement cage, an embedded steel ring 5 and an embedded bolt 6 are circumferentially arranged at the inner side of the reinforcement cage, an annular waterproof ring 7 is arranged at the inner side of the underground diaphragm wall 1, a water-swelling rubber 8 is arranged between the annular waterproof ring 7 and the embedded steel ring 5, the annular waterproof ring 7 is fixed with the embedded steel ring 5 through a steel pressing plate 9 and the embedded bolt 6, the annular waterproof ring 7 is made of an elastic material, the inner diameter of the annular waterproof ring 7 is smaller than the outer diameter of the jacking pipe 10, the annular waterproof ring 7 is made of the elastic material and smaller than the outer diameter of the 10, the annular waterproof ring 7 passes through the annular waterproof ring 7 and drives the jacking pipe 7 to permeate into the jacking pipe 10 along the advancing direction of the jacking pipe 10, and the annular waterproof ring 7 can be prevented from penetrating into the working well along the advancing direction 13 due to the fact that the annular waterproof ring is in the advancing direction of the jacking pipe 10; the annular waterproof ring 7 is installed and fixed on the embedded steel ring 5 by the steel pressing plate 9 and the water-swelling rubber 8, so that the waterproof ring has a good waterproof effect and is very firm.
In some specific embodiments, as shown in fig. 1 and 2, the grating cement-soil wall 2 adopts a multi-layer grating form, and the cement-soil wall is at least partially and closely arranged on the upper part of the outer wall of the underground diaphragm wall 1; the arrangement mode in the technical scheme can strengthen soil mass of the hole 13 on one hand in a large scale, has a good waterproof effect, and prevents surrounding groundwater from entering the jacking pipe 10 deeply and entering and exiting the hole 13.
In other specific embodiments, as shown in fig. 1 and 2, a layer of the grid cement soil wall 2, which is close to the underground continuous wall 1, is inserted with a straight steel sheet pile 11; in the technical scheme, the supporting capability and water stop are provided after the hole is broken and before the pipe jacking 10 enters and exits, and the straight steel sheet pile 11 is pulled out during the construction of the entering and exits.
Further preferably, a plurality of grouting pipes 12 are arranged on the side, close to the inlet and outlet of the working well, of the grid cement soil wall 2; in this technical scheme, a grouting pipe 12 is provided, so that grouting blocking can be performed when the hole 13 leaks water, please refer to fig. 1.
Further, the glass fiber ribs 14 and the foam concrete 15 are arranged at the square position of the opening 13 of the working well, the pre-buried steel ring 5 and the pre-buried bolts 6 are prevented from being damaged, the two ends of the glass fiber ribs 14 are overlapped with the steel bars 3 of the underground continuous wall 1, the glass fiber ribs 14 and the foam concrete 15 of the technical scheme are easy to crush manually, the pre-buried steel ring 5 and the pre-buried bolts 6 can be prevented from being damaged when a hole is broken, and specific reference is made to fig. 2.
Further, the embedded steel ring 5 and the embedded bolt 6 are wrapped and protected by plastic films, damage to the embedded part is avoided, and the hole 13 and the embedded part are conveniently cleaned at the hole 13.
Further, as shown in fig. 3, the cross section of the pre-buried steel ring 5 is L-shaped, and the effect of fixing the annular waterproof ring 7 is better.
Further, the grouting pipe 12 is a steel pipe wrapping the filter cloth, and grouting holes are formed in the steel pipe.
A construction method of a water-rich sand layer anti-flowing sand water-surge working well comprises the following steps:
s1, construction of a grid cement soil wall 2: a grating cement-soil wall 2 is arranged on one side of a push pipe 10 of a working well, which enters and exits a hole, by adopting a cement-soil mixing pile machine, the grating cement-soil wall 2 is of a multi-layer cement-soil wall structure and partially surrounds an underground continuous wall 1 of the working well, and the depth of the grating cement-soil wall 2 exceeds a certain depth of a hole 13 of the working well;
s2, installing a straight steel sheet pile 11 and a grouting pipe 12: inserting a linear steel sheet pile 11 into a layer of wall of the grid cement soil wall 2 close to the working well, wherein the linear steel sheet piles 11 are lapped through a lock catch to form a curtain, and the insertion depth of the linear steel sheet pile 11 exceeds a certain depth of the hole 13; a plurality of grouting pipes 12 are inserted at two sides of a hole 13 between the straight steel sheet pile 11 and the underground diaphragm wall 1, and the insertion depth of the grouting pipes 12 exceeds a certain depth of the hole 13; the grouting pipe 12 is a steel pipe wrapped with filter cloth, and small holes are fully punched on the steel pipe within the depth range of the hole 13 to serve as grouting holes.
S3, binding an underground continuous wall reinforcement cage: glass fiber ribs 14 are adopted at the position of the pipe jacking 10 for entering and exiting the hole, and two ends of each glass fiber rib 14 are overlapped with the corresponding steel bars 3 and fixed by U-shaped clamps; and a pre-buried steel ring 5 and a pre-buried bolt 6 are welded and fixed in the 3 cages of the steel bars of the underground diaphragm wall 1 at the position where the jacking pipe 10 enters and exits, and the surfaces of the pre-buried steel ring 5 and the pre-buried bolt 6 are wrapped by plastic films.
S4, pouring the underground continuous wall 1: carrying out grooving operation on the underground continuous wall 1 by using a grooving machine, lowering a steel bar 3 cage after grooving, and then pouring concrete 4; when the groove width concrete 4 with the hole 13 is poured, firstly pouring the concrete 4, then pouring foam concrete 15 in the area of the hole 13, and finally pouring the concrete 4.
S5, working well excavation: and excavating a working well to a design elevation after the concrete 4 of the underground diaphragm wall 1 reaches the design strength, and then sealing the bottom.
S6, manually breaking the hole 13: before the jacking pipe 10 enters the hole, firstly, manually breaking foam concrete 15 at the hole 13, taking care of protecting the embedded steel ring 5 and the embedded bolt 6 when breaking the foam concrete 15, removing the protective film and cleaning the surfaces of the embedded steel ring 5 and the embedded bolt 6.
S7, installing an annular waterproof ring 7: firstly, a layer of water-swelling rubber 8 is arranged on the embedded steel ring 5, then an annular waterproof ring 7 is arranged, and a layer of steel pressing plate 9 is arranged and fixed through the embedded bolts 6.
And S8, if water leakage and sand surging occur after the hole is broken, grouting reinforcement is carried out by using the grouting pipe 12.
S9, entering a hole of the jacking pipe 10: the straight steel sheet pile 11 is pulled out, cement soil wall damage caused by pulling out the steel sheet pile is reinforced by grouting of the grouting pipe 12, the jacking pipe 10 enters into drilling from the hole 13 or exits from the opposite direction, and penetrates out from the center of the annular waterproof ring 7 to drive the annular waterproof ring 7 to deform so as to play a waterproof role; by adopting the construction method, the construction risk is reduced, the phenomena of water burst and sand burst are avoided, and the construction time is saved.
It should be noted that the above embodiments are merely representative examples of the present invention. Many variations of the invention are possible. Any simple modification, equivalent variation and modification of the above embodiments according to the principles of the present invention should be considered to fall within the scope of the present invention.
Claims (8)
1. A construction method of a water-rich sand layer anti-flowing sand water-surge working well is characterized by comprising the following steps of: the working well structure comprises an underground continuous wall (1) and a grid cement soil wall (2) arranged at the inlet and outlet sides of the underground continuous wall (1), wherein the underground continuous wall comprises a reinforcement cage made of reinforcement (3) and concrete (4) poured in the reinforcement cage, an embedded steel ring (5) and embedded bolts (6) are circumferentially arranged on the inner side of the reinforcement cage, an annular waterproof ring (7) is arranged on the inner side of the underground continuous wall (1), water-swelling rubber (8) is arranged between the annular waterproof ring (7) and the embedded steel ring (5), the annular waterproof ring (7) is fixed with the embedded steel ring (5) through a steel pressing plate (9) and embedded bolts (6), the annular waterproof ring (7) is made of elastic materials, the inner diameter of the annular waterproof ring (7) is smaller than the outer diameter of a jacking pipe (10), and the annular waterproof ring (7) is tightly attached to the (10) and deforms along the advancing direction of the jacking pipe (10);
the method comprises the following steps:
s1, constructing a grid cement soil wall (2): a grating cement-soil wall is arranged on one side of a push pipe (10) of the working well, which enters and exits from a hole, by adopting a cement-soil stirring pile machine, is of a multi-layer cement-soil wall structure, and partially surrounds an underground continuous wall (1) of the working well, and the depth of the grating cement-soil wall exceeds a hole opening (13) of the working well by a certain depth;
s2, installing a straight steel sheet pile (11) and a grouting pipe (12): inserting a straight steel sheet pile (11) into a layer of wall of the grid cement soil wall close to the working well, wherein the straight steel sheet piles (11) are lapped through a lock catch to form a curtain, and the insertion depth of the straight steel sheet pile (11) exceeds a certain depth of the hole (13); a plurality of grouting pipes (12) are inserted into two sides of a hole (13) between the straight steel sheet pile (11) and the underground continuous wall (1), and the insertion depth of the grouting pipes (12) exceeds a certain depth of the hole (13); the grouting pipe (12) is a steel pipe wrapped with filter cloth, and small holes are fully drilled on the steel pipe within the depth range of the hole (13) to serve as grouting holes;
s3, binding an underground continuous wall reinforcement cage: glass fiber ribs (14) are adopted at the positions of the pipe jacking (10) entering and exiting holes, and two ends of each glass fiber rib (14) are overlapped with the corresponding steel bar (3) and fixed by U-shaped clamps; a pre-buried steel ring (5) and a pre-buried bolt (6) are welded and fixed in a cage of a steel bar (3) of a underground continuous wall (1) at the position of a jack pipe (10) entering and exiting a hole, and the surfaces of the pre-buried steel ring (5) and the pre-buried bolt (6) are wrapped by plastic films;
s4, pouring an underground continuous wall (1): carrying out grooving operation on the underground diaphragm wall (1) by using a grooving machine, placing a reinforcement (3) cage after grooving, and then pouring concrete (4); when the groove width concrete (4) with the hole (13) is poured, firstly pouring the concrete (4), then pouring foam concrete (15) in the area of the hole (13), and finally pouring the concrete (4);
s5, working well excavation: excavating a working well to a designed elevation after the concrete (4) of the underground diaphragm wall (1) reaches the designed strength, and then sealing the bottom;
s6, manually breaking the hole (13): before the jacking pipe (10) enters the tunnel, firstly manually breaking foam concrete (15) at the tunnel opening (13), taking care of protecting the embedded steel ring (5) and the embedded bolt (6) when the foam concrete (15) is broken, removing the protective film and cleaning the surfaces of the embedded steel ring (5) and the embedded bolt (6);
s7, installing an annular waterproof ring (7): firstly, a layer of water-swelling rubber (8) is arranged on an embedded steel ring (5), then an annular waterproof ring (7) is arranged, and then a layer of steel pressing plate (9) is arranged and fixed through embedded bolts (6);
s8, grouting and reinforcing by using a grouting pipe (12) if water leakage and sand surge occur after the hole is broken;
s9, jacking pipe (10) enters a hole: the horizontal steel sheet pile (11) is pulled out, cement soil wall damage caused by pulling out the steel sheet pile is reinforced by grouting through the grouting pipe (12), the jacking pipe (10) enters into the drilling hole from the hole (13) or exits from the opposite direction, and penetrates out from the center of the annular waterproof ring (7) to drive the annular waterproof ring (7) to deform so as to play a role in waterproof.
2. The construction method of the water-rich sand layer anti-sand-flow water-surge working well according to claim 1, wherein the grid cement-soil wall (2) adopts a multi-layer grid type, and the grid cement-soil wall (2) is at least partially and closely arranged on the upper part of the outer wall of the underground continuous wall (1).
3. The construction method of the water-rich sand layer anti-sand water-gushing working well according to claim 1, wherein the grid cement soil wall (2) is closely attached to one layer of the underground continuous wall (1) and is provided with a straight steel sheet pile (11) in an inserted mode.
4. The construction method of the water-rich sand layer anti-sand-flow water-surge working well according to claim 1, wherein a plurality of grouting pipes (12) are arranged on the grid cement soil wall (2) close to the inlet and outlet sides of the working well.
5. The construction method of the water-rich sand layer sand-flow-prevention water-surge working well according to claim 1, characterized in that glass fiber ribs (14) and foam concrete (15) are arranged at the opening (13) of the working well in a square shape, damage to the embedded steel rings (5) and the embedded bolts (6) is prevented, and two ends of the glass fiber ribs (14) are overlapped with steel bars (3) of the underground continuous wall (1).
6. The construction method of the water-rich sand layer anti-sand-flow water-surge working well according to claim 1, wherein the embedded steel ring (5) and the embedded bolt (6) are wrapped by plastic films.
7. The construction method of the water-rich sand layer anti-sand-flow water-surge working well according to claim 1, wherein the cross section of the pre-buried steel ring (5) is L-shaped.
8. The construction method of the water-rich sand layer anti-flowing sand water-flushing working well according to claim 1, wherein the grouting pipe (12) is a steel pipe wrapped with filter cloth, and grouting holes are formed in the steel pipe.
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