CN110645033A - Device and method for deep grouting in sandy cobble stratum shield construction tunnel - Google Patents
Device and method for deep grouting in sandy cobble stratum shield construction tunnel Download PDFInfo
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- CN110645033A CN110645033A CN201910986230.2A CN201910986230A CN110645033A CN 110645033 A CN110645033 A CN 110645033A CN 201910986230 A CN201910986230 A CN 201910986230A CN 110645033 A CN110645033 A CN 110645033A
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- 238000010276 construction Methods 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000005553 drilling Methods 0.000 claims abstract description 184
- 229910000831 Steel Inorganic materials 0.000 claims description 26
- 239000010959 steel Substances 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 25
- 229910001315 Tool steel Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 9
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000011083 cement mortar Substances 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims 2
- 238000007569 slipcasting Methods 0.000 abstract description 26
- 230000005641 tunneling Effects 0.000 description 12
- 239000002002 slurry Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000011440 grout Substances 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 239000011435 rock Substances 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 206010066054 Dysmorphism Diseases 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D21/00—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection
- E21D21/0026—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts
- E21D21/0046—Anchoring-bolts for roof, floor in galleries or longwall working, or shaft-lining protection characterised by constructional features of the bolts formed by a plurality of elements arranged longitudinally
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/03—Couplings; joints between drilling rod or pipe and drill motor or surface drive, e.g. between drilling rod and hammer
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/003—Machines for drilling anchor holes and setting anchor bolts
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/021—Grouting with inorganic components, e.g. cement
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D20/00—Setting anchoring-bolts
- E21D20/02—Setting anchoring-bolts with provisions for grouting
- E21D20/028—Devices or accesories for injecting a grouting liquid in a bore-hole
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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
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Environmental & Geological Engineering (AREA)
- Structural Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
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- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a device and a method for deep grouting in a sandy gravel stratum shield construction hole, which relate to the technical field of shield construction and comprise a drilling connection structure, wherein a first anchor rod, a plurality of connection anchor rods and the drilling anchor rod of the drilling connection structure are sequentially connected in a straight line; and a plurality of grouting holes are formed in the rod bodies for connecting the anchor rods and the drilling anchor rods. The device simple structure, can implement and can high-efficiently drill into higher degree of depth in the sandy gravel stratum shield constructs the construction hole, can avoid collapsing and develop and influence ground and building safety, and the slip casting method is quick convenient simultaneously.
Description
Technical Field
The invention relates to the technical field of shield construction, in particular to a device and a method for deep grouting in a shield construction tunnel of a sandy cobble stratum.
Background
The sandy gravel stratum is a special geological condition and has the characteristics of high strength, loose stratum, poor stability and the like. The shield inevitably disturbs and damages surrounding strata in the tunneling process, a collapse cavity is formed above the tunneling range of the shield and gradually moves to the ground to cause ground settlement and collapse or building settlement and damage, the position of the collapse cavity reflects rapid movement and expansion along with time according to different stability of sandy gravel strata, and the collapse cavity is far away from a shield tunneling segment to the ground. In addition, the sandy cobble rock mass has high strength, and if the sandy cobble rock mass is drilled by a drill bit, the drilling efficiency is low, and the hole forming speed is slow.
The pore-forming mode that current cave of collapsing was consolidated and was filled does, adopts the foraminiferous steel floral tube that the anterior segment is sharp form, strikes with the pneumatic drill and squeezes into the sandy gravel stratum in, and the grouting equipment is connected to the steel pipe of tip welding area ball valve and pipeline carry out the slip casting, or adopts pneumatic drill and drilling rod to creep into behind the pore-forming, inserts foraminiferous steel floral tube, and the grouting equipment is connected to the steel pipe of tip welding area ball valve and pipeline carries out the slip casting.
The main disadvantages of such a hole forming method are:
1. the method is limited by the structure of the shield machine, the upper part of the shield machine does not have the operation space of a longer steel pipe or a drill rod, the method can be implemented after the shield trolley is separated from a region needing to be reinforced, and the time is delayed seriously. Because the length of the shield trolley is generally more than 80m, the shield tunneling speed of the sandy gravel stratum is slow but the settlement development is fast, if the shield trolley completely passes through the region to be reinforced and then drilling, grouting and reinforcing are carried out, the upward development depth of a collapse cavity is large, or ground collapse or building settlement and damage are caused, the grouting and reinforcing time is seriously lagged, and the effect is poor.
2. When the perforated steel perforated pipe is driven into the stratum, the head part of the perforated steel perforated pipe is not provided with a drilling device, the tail end of the steel perforated pipe is only struck by the impact force of an air drill, the preset depth cannot be reached in the sandy gravel stratum, the position of the cavity is difficult to reach, and the grouting filling or reinforcing effect is poor.
3. The mode that the air drill rod is matched with the straight or cross drill bit to drill holes and then the perforated steel perforated pipe is inserted is adopted, and besides the time lag of construction, the single sand pebble has high strength, the drilling speed is low, and the hole collapse steel pipe cannot penetrate.
In order to solve the technical problems encountered when the shield machine is used for forming holes in the sandy gravel stratum, a device which can quickly drill holes in a narrow space as early as possible and improve the grouting work efficiency is required to be adopted.
Disclosure of Invention
The invention provides a device and a method for deep grouting in a sandy cobble stratum shield construction hole, wherein the device is simple in structure, can be implemented in the sandy cobble stratum shield construction hole, can efficiently drill at a higher depth, can avoid collapse development from influencing the safety of the ground and a building, and is quick and convenient in grouting connection method.
The purpose of the invention is realized by the following technical scheme:
a device for deep grouting in a sandy cobble stratum shield construction hole comprises a drilling connection structure, wherein the drilling connection structure comprises a wedge-shaped drill bit, a plurality of connecting sleeves, a hollow first anchor rod, a hollow drilling anchor rod and a plurality of hollow connecting anchor rods; the first anchor rod, the plurality of connecting anchor rods and the drilling anchor rod are sequentially connected in a straight line, one end of the first anchor rod is connected with one end of the adjacent connecting anchor rod through the connecting sleeve, the other end of the first anchor rod is detachably connected with a drilling connecting joint or a grouting connecting structure, two adjacent connecting anchor rods are connected through the connecting sleeve, one end of the drilling anchor rod is connected with one end of the adjacent connecting anchor rod through the connecting sleeve, and the other end of the drilling anchor rod is connected with a wedge-shaped drill bit; and the rod bodies of the connecting anchor rods and the drilling anchor rods are provided with grouting holes.
By adopting the technical scheme, the drilling connection structure of the device comprises a wedge-shaped drill bit, a connecting sleeve, a hollow first anchor rod, a hollow drilling anchor rod and a plurality of hollow connecting anchor rods, wherein the connecting anchor rods are connected section by the aid of the connecting sleeve, and the upper part operation space of the trolley can be utilized when the shield segment is separated from the shield tail; a wedge-shaped drill bit is fixed on the drilling anchor rod, and the wedge-shaped drill bit extrudes small-diameter pebbles or chisels large pebbles in a dense sandy pebble stratum to realize smooth and rapid hole forming in the sandy pebble stratum; then the drilling connecting joint connected with the first anchor rod drives the wedge-shaped drill bit of the drilling anchor rod to drill holes by utilizing the air drill to connect the drilling connecting joint, the grouting connecting structure connected with the first anchor rod performs grouting on the connecting anchor rod and the rod body of the drilling anchor rod, and grouting liquid fills the collapse cavity and performs grouting reinforcement on surrounding strata through the grouting hole of the anchor rod, so that the collapse cavity is prevented from developing upwards and the ground settlement is reduced; the grouting connecting structure realizes the quick connection of the first anchor rod and grouting pipelines with different diameters, and the grouting time is shortened; the device simple structure, can implement and can high-efficiently drill into higher degree of depth in the sandy cobble stratum shield constructs the construction hole, can avoid simultaneously collapsing and developing and influence ground and building safety.
Preferably, the drilling connecting joint comprises a drilling connecting sleeve and hexagonal tool steel, one end of the drilling connecting sleeve is connected with the first anchor rod, and the other end of the drilling connecting sleeve is connected with the hexagonal tool steel. The grouting connection structure comprises a special-shaped connection sleeve, a ball valve and a grouting steel pipe with threads, one end of the special-shaped connection sleeve is hermetically connected with the ball valve, the other end of the special-shaped connection sleeve is connected with the first anchor rod, and one end of the grouting steel pipe is hermetically connected with one end of the ball valve, which is far away from the special-shaped connection sleeve.
By adopting the technical scheme, one end of the drilling connecting sleeve of the drilling connecting joint is connected with the anchor rod, and the other end of the drilling connecting sleeve is connected with the hexagonal tool steel, so that the anchor rod and the air drill can be conveniently and quickly connected; dysmorphism connecting sleeve one end links to each other with first stock is airtight, and the other end and ball valve be airtight connection, and special-shaped connecting sleeve plays the effect of connecting, and the other end of ball valve and special-shaped connecting sleeve is connected and slip casting steel pipe's the other end access slip casting pipeline and equipment with threaded slip casting steel pipe simultaneously, lets the slip casting liquid can pass through slip casting connection structure smoothly and can not take place to leak out the thick liquid. When the externally required grouting liquid enters from a grouting pipe connected with the ball valve and then passes through the ball valve, the ball valve can control the flowing flow rate of the passing grouting liquid.
Preferably, one end of the special-shaped connecting sleeve is provided with an internal thread matched with the first anchor rod, and the other end of the special-shaped connecting sleeve is provided with an external thread matched with the ball valve.
Through adopting above-mentioned technical scheme, special-shaped connecting sleeve is equipped with the external screw thread with the internal thread of first stock looks adaptation and ball valve looks adaptation, is convenient for realize being connected fast with stock and ball valve through special-shaped connecting sleeve like this, and not hard up when preventing the slip casting is leaked thick liquid.
Preferably, the length of the first anchor rod, the drilling anchor rod and the connecting anchor rods is 1m ~ 1.5.5 m.
Through adopting above-mentioned technical scheme, the solution receives the restriction of shield structure machine structure, and the less problem in shield structure machine upper portion operation space realizes quick drilling and slip casting, prevents that the chamber of collapsing from upwards developing the degree of depth great or causing ground to collapse or the building subsides and destroys, all sets up 1m ~ 1.5.5 m to first stock, the stock of creeping into and the length of connecting anchor rod, makes things convenient for at the construction operation face quick operation.
Preferably, a plurality of the grouting holes are uniformly distributed on the connecting anchor rod and the drilling anchor rod.
Through adopting above-mentioned technical scheme, the purpose that the injected hole equipartition set up on connecting the stock and creeping into the stock can make the slip casting liquid evenly pour into in place stratum and cavity through the injected hole, prevents to influence ground and building safety because the slip casting effect is not good because the slip casting inequality causes.
Preferably, the wedge bit is made of alloy materials.
Through adopting above-mentioned technical scheme, the wedge drill bit is the alloy material, and the alloy wedge drill bit of high strength can extrude out minor diameter cobble in closely knit sand cobble stratum on the one hand, and on the other hand has sufficient intensity to chisel out the cobble, and the smooth quick pore-forming in the sand cobble stratum.
Preferably, an internal thread matched with the plurality of connecting anchor rods is arranged in the connecting sleeve cavity.
Through adopting above-mentioned technical scheme, be equipped with in the adapter sleeve cavity with the internal thread of being connected stock looks adaptation, can realize the adapter sleeve and the high-speed joint of connecting the stock to alright drilling pore-forming fast, save time, slip casting is effectual.
Preferably, a method for grouting by using the device for deep grouting in a sandy gravel stratum shield construction hole as claimed in any one of claims 1 ~ 8, comprises the following steps:
s1: the drilling of the drilling anchor rod comprises the steps that firstly, a specially-made alloy wedge-shaped drill bit is welded at one end of the drilling anchor rod, the other end of the drilling anchor rod is connected with a drilling hole connecting joint, the other end of the drilling hole connecting joint is connected with an air drill, and the wedge-shaped drill bit of the drilling anchor rod is driven to rotate by the drilling force of the air drill to realize drilling;
s2: after the rod body of the drilling anchor rod drills a hole, the drilling connecting joint is taken down, the connecting anchor rod to be drilled is quickly connected with the drilling anchor rod through the connecting sleeve, one end of the drilling connecting joint is connected into the end head of the connecting anchor rod, and the other end of the drilling connecting joint is connected with an air drill continuously until the rod body of the connecting anchor rod drills the hole;
s3: and repeating the process of S2 until the total connection length of the drilling anchor rod and the connecting anchor rod is the designed hole depth and is less than the length of the first anchor rod, and then replacing the first anchor rod for drilling until the designed hole depth is drilled.
S4: then the drilling connecting joint is removed, a grouting hole is not formed in the rod body of the first anchor rod, and the end part of the first anchor rod is connected with a grouting replacing connecting structure again to be used for quickly completing the injection of grouting liquid;
s5: stopping grouting until the grouting liquid is filled or the designed amount is reached, removing the connecting grouting connecting structure after the grouting liquid is initially set, then cutting off the rod body of the first anchor rod exposed outside the hole by using a grinding wheel sheet, and plugging the reserved hole by using cement mortar to finish grouting.
By adopting the technical scheme, the first step of the grouting method is that the drilling of the anchor rod can be realized by utilizing the drilling force of the air drill to drive the wedge-shaped drill bit of the drilling anchor rod to rotate; secondly, connecting anchor rods, wherein the special connecting sleeve can realize quick connection between the anchor rods; thirdly, replacing a first anchor rod to drill until the designed hole depth is reached; and fourthly, cutting off the last anchor rod and plugging and maintaining the hole, cutting off the rod body of the first anchor rod exposed outside the hole by using a grinding wheel sheet, and plugging the reserved hole by using cement mortar to finish grouting.
The invention has the beneficial effects that:
1. the drilling connecting structure of the device comprises a wedge-shaped drill bit, a connecting sleeve, a hollow first anchor rod, a hollow drilling anchor rod and a plurality of hollow connecting anchor rods, wherein the connecting anchor rods are connected section by the aid of the connecting sleeve, and the upper part operation space of the trolley can be utilized when the shield segment is separated from the shield tail; a wedge-shaped drill bit is fixed on the drilling anchor rod, and the wedge-shaped drill bit extrudes small-diameter pebbles or chisels large pebbles in a dense sandy pebble stratum to realize smooth and rapid hole forming in the sandy pebble stratum; then the drilling connecting joint connected with the first anchor rod drives the wedge-shaped drill bit of the drilling anchor rod to drill holes by utilizing the air drill to connect the drilling connecting joint, the grouting connecting structure connected with the first anchor rod performs grouting on the connecting anchor rod and the rod body of the drilling anchor rod, and grouting liquid fills the collapse cavity and performs grouting reinforcement on surrounding strata through the grouting hole of the anchor rod, so that the collapse cavity is prevented from developing upwards and the ground settlement is reduced; the grouting connecting structure realizes the quick connection of the first anchor rod and grouting pipelines with different diameters, and the grouting time is shortened; the device simple structure, can implement and can high-efficiently drill into higher degree of depth in the sandy cobble stratum shield constructs the construction hole, can avoid simultaneously collapsing and developing and influence ground and building safety.
2. One end of a drilling connecting sleeve of the drilling connecting joint is connected with the anchor rod, and the other end of the drilling connecting sleeve is connected with the hexagonal tool steel, so that the anchor rod and the air drill can be conveniently and quickly connected; dysmorphism connecting sleeve one end links to each other with first stock is airtight, and the other end and ball valve be airtight connection, and special-shaped connecting sleeve plays the effect of connecting, and the other end of ball valve and special-shaped connecting sleeve is connected and slip casting steel pipe's the other end access slip casting pipeline and equipment with threaded slip casting steel pipe simultaneously, lets the slip casting liquid can pass through slip casting connection structure smoothly and can not take place to leak out the thick liquid. When the externally required grouting liquid enters from a grouting pipe connected with the ball valve and then passes through the ball valve, the ball valve can control the flowing flow rate of the passing grouting liquid.
3. The special-shaped connecting sleeve is provided with an internal thread matched with the first anchor rod and an external thread matched with the ball valve, so that the special-shaped connecting sleeve can be conveniently and quickly connected with the anchor rod and the ball valve, the problem of loosening and leaking of slurry during grouting is solved, the problem that the upper part operation space of a shield tunneling machine is small due to the structural limitation of the shield tunneling machine is solved, quick drilling and grouting are realized, the upward development depth of a collapse cavity is prevented from being large, the ground collapse or the settlement and damage of a building are prevented, the lengths of the first anchor rod, the drilling anchor rod and the connecting anchor rod are all set to be 1m ~ 1.5.5 m, and the quick operation on a construction.
4. The grouting holes are uniformly distributed on the connecting anchor rod and the drilling anchor rod, so that grouting liquid can be uniformly injected into the stratum and the cavity through the grouting holes, and the problems that the grouting effect is poor due to nonuniform grouting, and the safety of the ground and a building is affected are solved; the wedge-shaped drill bit is made of alloy materials, on one hand, the high-strength alloy wedge-shaped drill bit can extrude small-diameter pebbles in a compact sandy pebble stratum, on the other hand, the high-strength alloy wedge-shaped drill bit has enough strength to chisel out large pebbles, and holes are smoothly and quickly formed in the sandy pebble stratum; the connecting sleeve cavity is internally provided with an internal thread matched with the connecting anchor rod, so that the connecting sleeve and the connecting anchor rod can be quickly connected, the hole can be quickly drilled, the time is saved, and the grouting effect is good.
5. In the first step of the grouting method, the drilling of the drilling anchor rod can utilize the drilling force of an air drill to drive a wedge-shaped drill bit of the drilling anchor rod to rotate so as to realize drilling; secondly, connecting anchor rods, wherein the special connecting sleeve can realize quick connection between the anchor rods; thirdly, replacing a first anchor rod to drill until the designed hole depth is reached; and fourthly, cutting off the last anchor rod and plugging and maintaining the hole, cutting off the rod body of the first anchor rod exposed outside the hole by using a grinding wheel sheet, and plugging the reserved hole by using cement mortar to finish grouting.
Drawings
FIG. 1 is a schematic structural diagram of a deep grouting device in a shield construction tunnel of a sandy cobble stratum according to the invention;
FIG. 2 is a schematic view of a drilling connection joint structure of a device for deep grouting in a shield construction hole of a sandy cobble stratum according to the invention;
FIG. 3 is a schematic view of a grouting connection structure of a deep grouting device in a sandy cobble stratum shield construction hole of the invention;
FIG. 4 is a schematic sectional view taken along line A-A of FIG. 3;
FIG. 5 is a schematic view of a construction process flow of the method for deep grouting in a sandy gravel stratum shield construction hole.
In the figure, 1-wedge drill bit, 2-first anchor rod, 3-grouting hole, 4-connecting sleeve, 5-hexagonal tool steel, 6-drilling connecting joint, 7-special-shaped connecting sleeve, 8-ball valve, 9-grouting steel pipe, 21-drilling anchor rod, 22-connecting anchor rod and 41-drilling connecting sleeve.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
The shield often meets a sandy gravel stratum in the tunneling process, and the sandy gravel stratum is a special geological condition and has the characteristics of high strength, loose stratum, poor stability and the like. The shield tunneling machine generates disturbance and damage to surrounding strata, a collapse cavity is formed above a shield tunneling range and gradually moves to the ground to cause ground settlement and collapse or building settlement and damage, the position of the collapse cavity reflects rapid movement and expansion along with time according to different stability of sandy gravel strata, and the collapse cavity is far away from a shield tunneling segment to the ground. In addition, the sandy cobble rock mass has high strength, and if the sandy cobble rock mass is drilled by a drill bit, the drilling efficiency is low, and the hole forming speed is slow. In order to solve the technical problem encountered in the tunneling process of the shield tunneling machine, the device and the method for deep grouting in the shield construction hole of the sandy gravel stratum disclosed by the invention are designed as shown in figures 1 to 5.
A device for deep grouting in a sandy gravel stratum shield construction hole comprises a drilling connection structure, wherein the drilling connection structure comprises a wedge-shaped drill bit 1, a plurality of connecting sleeves 4, a hollow first anchor rod 2, a hollow drilling anchor rod 21 and a plurality of hollow connecting anchor rods 22; the first anchor rod 2, the plurality of connecting anchor rods 22 and the drilling anchor rod 21 are sequentially connected in a straight line, one end of the first anchor rod 2 is connected with one end of the adjacent connecting anchor rod 22 through a connecting sleeve 4, the other end of the first anchor rod 2 is detachably connected with the drilling connecting joint 6 or the grouting connecting structure, two adjacent connecting anchor rods 22 are connected through the connecting sleeve 4, one end of the drilling anchor rod 21 is connected with one end of the adjacent connecting anchor rod 22 through the connecting sleeve 4, and the other end of the drilling anchor rod 21 is connected with the wedge-shaped drill bit 1; a plurality of shank connecting the anchor rods 2 and drilling the anchor rods 21 are provided with grouting holes 3. The connecting anchor rods 21 of the device are connected section by the aid of connecting sleeves, and the upper part operation space of the trolley can be utilized when the shield segment is separated from the shield tail; a wedge-shaped drill bit 1 is fixed on the drilling anchor rod 21, and the wedge-shaped drill bit 1 extrudes small-diameter pebbles or chisels large pebbles in a dense sandy pebble stratum to realize smooth and rapid hole forming in the sandy pebble stratum; then the drilling connecting joint connected with the first anchor rod 2 drives the wedge-shaped drill bit 1 of the drilling anchor rod 21 to drill by utilizing the air drill to connect the drilling connecting joint, the grouting connecting structure connected with the first anchor rod 2 performs grouting to the connecting anchor rod 22 and the rod body of the drilling anchor rod 21, and the grouting liquid fills the collapse cavity and performs grouting reinforcement on the surrounding stratum through the grouting hole 3 of the anchor rod, so that the collapse cavity is prevented from developing upwards and the ground settlement is reduced; the grouting connection structure realizes the quick connection of the first anchor rod 2 and grouting pipelines with different diameters, and shortens grouting time.
When the device is used in practice, the device comprises a drilling connection structure which comprises a drilling connection structure, wherein the drilling connection structure comprises a wedge-shaped drill bit 1, a plurality of connecting sleeves 4, a hollow first anchor rod 2, a hollow drilling anchor rod 21 and a plurality of hollow connection anchor rods 22, the first anchor rod 2, the plurality of connection anchor rods 22 and the drilling anchor rod 21 are sequentially connected in a straight line, one end of the first anchor rod 2 is connected with one end of the adjacent connection anchor rod 22 through the connecting sleeve 4, the other end of the first anchor rod 2 is detachably connected with the drilling connection joint 6 or a grouting connection structure, one end of the connection drilling connection joint 6 is used for drilling the first anchor rod 2, the other end of the connection drilling connection joint 6 is connected with a drilling power device for drilling, the connection grouting connection structure aims at grouting injection of grout, the drilling connection joint 6 comprises a drilling connecting sleeve 41 and a six-edge tool steel 5, when drilling of one end of the drilling connection connecting sleeve 41 begins to drill, the drilling anchor rod 21 is connected with the drilling anchor rod, the drilling connection steel 5 is connected with the drilling steel rod, the drilling steel 5, the drilling tool 5 is connected with the six-drilling anchor rod, the drilling connection anchor rod, the drilling tool steel 5 is connected with the drilling tool steel 5, the six-drilling anchor rod-drilling connection anchor rod-drilling device is connected anchor rod-drilling device, the drilling anchor rod-drilling device is designed to-drilling device is connected anchor rod-drilling device, the drilling device is connected anchor rod-drilling device, the drilling device is connected anchor rod-drilling device, the drilling device is designed to-connected anchor rod 2, the drilling device is used in-connected anchor rod 21, the drilling device is capable of the drilling device, the device is capable of drilling device, the device is capable of drilling device, the device is capable of drilling device, the device is capable of drilling device, the device is capable of drilling device, the device is capable of.
Furthermore, in the actual grouting process, the first anchor rod 2 remained outside the hole is connected with grouting equipment and a pipeline by adopting a grouting connection structure, so that the time for connecting joints can be saved. The grouting connection structure comprises a special-shaped connection sleeve 7, a ball valve 8 and a grouting steel pipe 9 with threads, one end of the special-shaped connection sleeve 7 is hermetically connected with the ball valve 8, the other end of the special-shaped connection sleeve 7 is connected with the first anchor rod 2, and one end, far away from the special-shaped connection sleeve 7, of the ball valve 8 is hermetically connected with one end of the grouting steel pipe 9; the grouting connecting structure connected with the anchor rod 2 can realize the quick connection of grouting pipelines with different diameters and the anchor rod 2, meanwhile, the grouting pipelines do not need to be welded, bound and fixed on site, the grouting operation time is shortened, and the grouting connecting structure has the advantages of convenience in installation, high speed, strong pressure bearing capacity, no slurry leakage and the like; when the connection, the one end of the drilling anchor rod 21 is linearly connected with the last connection anchor rod 22 of the connection anchor rods 22 through the connecting sleeve 4, and the two ends are abutted as far as possible, so that each section of the drilling connection anchor rod 22 can be on the same straight line, the grouting liquid can smoothly pass through, and the grouting quality is greatly improved. Further, get off the air drill after the completion of creeping into and installing first stock 2, demolish drilling attach fitting 6, stay the pole body one end outside the hole with slip casting connection structure's special-shaped connecting sleeve 7's one end and first stock 2 afterwards and link to each other, special-shaped connecting sleeve 7's the other end and ball valve 8 be airtight connection, in order to prevent to leak thick liquid in the slip casting, special-shaped connecting sleeve 7 one end is equipped with the internal thread with 2 looks adaptations of first stock, special-shaped connecting sleeve 7's the other end is equipped with the external screw thread with 8 looks adaptations of ball valve. The slip casting pipeline is connected to the one end of slip casting steel pipe 9, and slip casting equipment is connected to the end of slip casting pipeline to use when being convenient for the slip casting.
Further, when external grout needs to be injected into the device, a high-pressure grouting pump is used for injecting certain grout, the injected grout passes through a grouting pipeline and then passes through the threaded steel pipe 9 and then the ball valve 8 and the special-shaped connecting sleeve 7, the injected grout enters the first anchor rod 2, and the injected grout is injected into the stratum of the hole or the filling cavity in a diffusion mode through the connecting anchor rod 22 and the grouting hole 3 formed in the rod body of the drilling anchor rod 21 under the pressure of the high-pressure grouting pump. According to the design requirement, pure cement slurry, cement water glass, micro-expansion cement slurry and the like can be injected through a high-pressure grouting pump until the cavity or the stratum is filled with the grouting slurry, then the ball valve 8 is closed, after the slurry is initially set, a part of the anchor rod 2 exposed outside the hole is cut off by a grinding wheel sheet, the reserved hole is blocked by cement slurry, and grouting is finished.
Furthermore, in order to use the device in a matching way, a proper method is needed, so a method for deep grouting in a shield construction tunnel of a sandy gravel stratum is designed, a specific construction process flow is shown in fig. 5, and the method comprises the following steps:
s1: when the drilling of the first anchor rod 2 begins, the drilling connecting joint 6 connected with one end of the drilling anchor rod 21 of the device is utilized, the other end of the drilling connecting joint 6 is connected with the air drill, and the wedge-shaped drill bit 1 of the first anchor rod 2 is driven to rotate by the drilling force of the air drill to realize the drilling. In the drilling process, the wedge-shaped drill bit 1 extrudes small-diameter pebbles or chisels out cobbles in a compact sand-pebble stratum, so that smooth and rapid hole forming is realized in the sand-pebble stratum. Until the anchor rod 2 is drilled into the hole, the connecting anchor rod 22 to be drilled is connected by the connecting sleeve 4.
S2: after the shaft of the anchor rod 21 is drilled into the hole, the drilling connecting joint 6 is taken down, the connecting anchor rod 22 to be drilled is quickly connected with the drilling anchor rod 21 through the connecting sleeve 4, then one end of the drilling connecting joint 6 is connected into the end of the connecting anchor rod 22, and the other end of the drilling connecting joint 6 is connected with the air drill to continue until the shaft of the connecting anchor rod 22 drills into the hole.
S3: the above-described process of S2 is then repeated until the total length of the connection of the drill bolt 21 and the connecting bolt 22 is the designed hole depth and less than the length of the first bolt, and then the first bolt 2 is replaced to drill until the designed hole depth is reached.
S4: and then the drilling connecting joint 6 is removed, meanwhile, the body of the first anchor rod 2 is not provided with the grouting hole 3, and the end part of the first anchor rod 2 is reconnected to be replaced with a grouting connecting structure for quickly finishing the injection of grouting liquid.
S5: stopping grouting until the grouting liquid is filled or the designed amount is reached, removing the connection grouting connection structure after the grouting liquid is initially set, then cutting off the rod body of the first anchor rod 2 exposed outside the hole by using a grinding wheel sheet, and plugging the reserved hole by using cement mortar to finish grouting.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A device for deep grouting in a sandy gravel stratum shield construction hole is characterized by comprising a drilling connection structure, wherein the drilling connection structure comprises a wedge-shaped drill bit (1), a plurality of connecting sleeves (4), a hollow first anchor rod (2), a hollow drilling anchor rod (21) and a plurality of hollow connecting anchor rods (22); the first anchor rod (2), the plurality of connecting anchor rods (22) and the drilling anchor rod (21) are sequentially connected in a straight line, one end of the first anchor rod (2) is connected with one end of the connecting anchor rod (22) adjacent to the end of the first anchor rod through the connecting sleeve (4), the other end of the first anchor rod (2) is detachably connected with a drilling connecting joint (6) or a grouting connecting structure, two adjacent connecting anchor rods (22) are connected through the connecting sleeve (4), one end of the drilling anchor rod (21) is connected with one end of the connecting anchor rod (22) adjacent to the end of the drilling anchor rod through the connecting sleeve (4), and the other end of the drilling anchor rod (21) is connected with a wedge-shaped drill bit (1);
and the rod bodies of the connecting anchor rods (2) and the drilling anchor rods (21) are provided with grouting holes (3).
2. The device for deep grouting in a sandy gravel stratum shield construction hole as claimed in claim 1, wherein the drilling connection joint (6) comprises a drilling connection sleeve (41) and hexagonal tool steel (5), one end of the drilling connection sleeve (41) is connected with the first anchor rod (2), and the other end of the drilling connection sleeve (41) is connected with the hexagonal tool steel (5);
the grouting connection structure comprises a special-shaped connection sleeve (7), a ball valve (8) and a grouting steel pipe (9) with threads, one end of the special-shaped connection sleeve (7) is connected with the ball valve (8) in a sealing mode, the other end of the special-shaped connection sleeve (7) is connected with the first anchor rod (2), and the ball valve (8) is far away from one end of the special-shaped connection sleeve (7) and one end of the grouting steel pipe (9) is connected in a sealing mode.
3. The device for deep grouting in a sandy gravel stratum shield construction hole as claimed in claim 2, wherein one end of the special-shaped connecting sleeve (7) is provided with an internal thread matched with the first anchor rod (2), and the other end of the special-shaped connecting sleeve (7) is provided with an external thread matched with the ball valve (8).
4. A device for deep grouting in a sandy gravel stratum shield construction hole according to claim 1, wherein the lengths of the first anchor rod (2), the drilling anchor rod (21) and the plurality of connecting anchor rods (22) are all 1m ~ 1.5.5 m.
5. A device for deep grouting in a sandy gravel stratum shield construction hole according to claim 1, wherein a plurality of grouting holes (3) are uniformly distributed in the connecting anchor rod (22) and the drilling anchor rod (21).
6. The device for deep grouting in a sandy gravel stratum shield construction hole as claimed in claim 1, wherein the wedge bit (1) is made of alloy material.
7. The device for deep grouting in a sandy gravel stratum shield construction hole as claimed in claim 1, wherein internal threads matched with the plurality of connecting anchor rods (22) are arranged in the cavity of the connecting sleeve (4).
8. A grouting method using the device for deep grouting in a sandy gravel stratum shield construction hole as claimed in any one of claims 1 ~ 8, which is characterized by comprising the following steps:
s1: the drilling of the drilling anchor rod (21) comprises the steps that firstly, a specially-made alloy wedge-shaped drill bit (1) is welded at one end of the drilling anchor rod (21), the other end of the drilling anchor rod (21) is connected with a drilling hole connecting joint (6), the other end of the drilling hole connecting joint (6) is connected with an air drill, and the wedge-shaped drill bit (1) of the drilling anchor rod (21) is driven to rotate by the drilling force of the air drill to realize drilling;
s2: after the shaft of the drilling anchor rod (21) drills into the hole, the drilling connecting joint (6) is taken down, the connecting anchor rod (22) needing to be drilled is quickly connected with the drilling anchor rod (21) through the connecting sleeve (4), then one end of the drilling connecting joint (6) is connected into the end of the connecting anchor rod (22), the other end of the drilling connecting joint (6) is connected with an air drill, and the air drill continues until the shaft of the connecting anchor rod (22) drills into the hole;
s3: then repeating the process of S2 until the total connection length of the drilling anchor rod (21) and the connecting anchor rod (22) is the designed hole depth and is less than the length of the first anchor rod, and then replacing the first anchor rod (2) to drill until the designed hole depth is reached;
s4: then the drilling connecting joint (6) is removed, the grouting hole (3) is not formed in the rod body of the first anchor rod (2), and the end part of the first anchor rod (2) is reconnected to be replaced with a grouting connecting structure for quickly completing the injection of grouting liquid;
s5: stopping grouting until the grouting liquid is filled or the designed amount is reached, removing the connection grouting connection structure after the grouting liquid is initially set, then cutting off the rod body of the first anchor rod (2) exposed outside the hole by using a grinding wheel sheet, and plugging the reserved hole by using cement mortar to finish grouting.
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| CN201910986230.2A CN110645033A (en) | 2019-10-17 | 2019-10-17 | Device and method for deep grouting in sandy cobble stratum shield construction tunnel |
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| CN201910986230.2A CN110645033A (en) | 2019-10-17 | 2019-10-17 | Device and method for deep grouting in sandy cobble stratum shield construction tunnel |
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| CN112195908A (en) * | 2020-10-12 | 2021-01-08 | 湖南捷和建筑工程有限公司 | Foundation drilling and grouting reinforcement method suitable for construction in narrow space |
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