CN111254933A - Karst grouting construction method for sleeve valve pipe - Google Patents

Karst grouting construction method for sleeve valve pipe Download PDF

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Publication number
CN111254933A
CN111254933A CN202010067085.0A CN202010067085A CN111254933A CN 111254933 A CN111254933 A CN 111254933A CN 202010067085 A CN202010067085 A CN 202010067085A CN 111254933 A CN111254933 A CN 111254933A
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CN
China
Prior art keywords
grouting
sleeve valve
drilling
pipe
valve pipe
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CN202010067085.0A
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Chinese (zh)
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CN111254933B (en
Inventor
王灿伟
阮衡
柳壮东
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Wuhan Zhenghong Geotechnical Engineering Co Ltd
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Wuhan Zhenghong Geotechnical Engineering Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D19/00Keeping dry foundation sites or other areas in the ground
    • E02D19/06Restraining of underground water
    • E02D19/12Restraining of underground water by damming or interrupting the passage of underground water
    • E02D19/18Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/18Bulkheads or similar walls made solely of concrete in situ
    • E02D5/187Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00Production methods
    • E02D2250/003Injection of material

Abstract

The invention relates to a karst grouting construction method for sleeve valve pipes, relates to the technical field of karst grouting construction, and solves the problems that hole types need to be identified in the whole drilling process, the steps are complicated, and the overall construction workload is increased, and the method comprises the following steps: a: grouting a big karst cave: a: determining a big through karst cave; b: arranging grouting holes and drilling; c: preparing slurry on site; d: lowering the sleeve valve pipe; e: grouting; b: grouting in other areas: f: confirming a punctate development area, a strip development area and a planar development area; g: arranging grouting holes and drilling; h: lowering the sleeve valve pipe; i: and (6) grouting. The method firstly carries out grouting reinforcement on the large exploration karst cave, and then sequentially carries out drilling and grouting on the punctate development area, the strip development area and the planar development area of other areas, thereby reducing the steps of exploring any karst cave position, effectively improving the construction efficiency, reducing the labor force, reducing the resource waste and being more environment-friendly.

Description

Karst grouting construction method for sleeve valve pipe
Technical Field
The invention relates to the technical field of karst grouting construction, in particular to a karst grouting construction method for sleeve valve pipes.
Background
The karst grouting is grouting by constructing an impervious curtain in a karst development area, the existing karst grouting reinforcement technology at home and abroad mainly adopts a sleeve valve pipe grouting method, a high-pressure rotary spraying method and a riprap sand filling method, for a karst cave and a karst clearance system which are more complex below the ground surface, grouting is carried out by opening holes and adopting sleeve valve pipes, and grouting materials are mainly cement paste, can carry out depth setting, quantification, sequencing, segmentation, intermittence and repeated grouting, integrates the advantages of a splitting grouting method, a compaction grouting method and an infiltration grouting method, has strong adaptability, can achieve better grouting reinforcement effects on a sand layer, silt, a mud layer and a soil cave lamp, but the karst development distribution is more complex, and the traditional direct opening grouting method easily causes resource waste and has higher engineering cost under the same karst geological development form.
The existing Chinese patent with the publication number of CN110230309A provides a construction method of a karst area bridge karst cave, which comprises the following steps: punching and karst cave processing, wherein the punching and karst cave processing are repeatedly executed until a hole is formed finally; identifying types, judging the type of the karst cave according to the vertical depth and the existence of fillers before drilling, in the drilling process and in the pouring process, wherein the type of the karst cave comprises general karst development, relatively developed karst, polar karst development and full filling, the treatment method comprises pretreatment before construction, treatment in the drilling process and treatment in the concrete pouring process, the reverse form of the follow-up of a steel protective pipe is adopted for the karst cave with polar karst development by the pretreatment, the cement slurry injection is mainly used for the general development of the karst, the relatively developed karst and full filling of the karst cave, and the double-liquid slurry is used as an auxiliary.
The above prior art solutions have the following drawbacks: the operation of identifying the hole types is carried out before drilling, in the drilling process and in the pouring process, the steps are complicated, the integral construction workload is increased, workers are tired, and the construction difficulty is high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a sleeve valve pipe karst grouting construction method which is capable of integrally and then replenishing grout, adjusting according to the actual situation on site, reducing the workload and having high construction efficiency.
The above object of the present invention is achieved by the following technical solutions:
the sleeve valve pipe karst grouting construction method comprises the following steps:
a: grouting a big karst cave:
a: determining a through big karst cave according to the advanced drilling investigation data;
b: arranging grouting holes according to the region of the communicated big karst cave on site, and drilling to obtain a drilling report;
c: preparing slurry on site;
d: lowering the sleeve valve pipe, wherein the top end of the sleeve valve pipe is provided with a protective cap, and the number of the grouting holes is marked;
e: the grouting pump guides the grout to perform grouting through the sleeve valve pipe;
b: grouting in other areas:
f: confirming the punctate development area, the strip development area and the planar development area of the karst cave on site to obtain a measurement lofting report;
g: arranging grouting holes according to the spot development area, the strip development area and the planar development area in sequence according to the field condition, and drilling to obtain a drilling report;
h: lowering a sleeve valve pipe, and marking the number of grouting holes;
i: the grouting pump guides the grout to perform grouting through the sleeve valve pipe.
By adopting the technical scheme, compared with the prior art, the method has the advantages that the large cavern to be explored is firstly grouted and reinforced, the grouting label is marked to determine the grouted and reinforced large cavern area, after large-scale filling and fixing are realized, the point development area, the strip development area and the planar development area of other areas are sequentially drilled and grouted, and compared with the method of drilling, exploring and grouting simultaneously in the prior art, the construction method reduces the steps of exploring any cavern position, effectively improves the construction efficiency, has better grouting reinforcement, reduces the labor strength of workers, reduces the resource waste, is more environment-friendly and safe, and has high comprehensive economic benefit.
The present invention in a preferred example may be further configured to: the drilling report in step g is mainly based on the following principles:
(1) grouting holes beside the cavities (within 1 m) in the punctiform development areas;
(2) in the strip-shaped development area, grouting holes are uniformly distributed along the pile spacing according to the trend of strips, the hole spacing is controlled to be about 2m, and if the field condition has large change, the point positions can be increased or decreased according to the actual field condition;
(3) in the planar development area, the grouting holes are uniformly distributed along the pile spacing according to the planar trend, the hole spacing is controlled to be about 2m, and if the field condition has larger change, the point positions can be increased or decreased according to the actual field condition.
By adopting the technical scheme, different drilling schemes are used in different areas, so that grouting work in different karst cave areas is facilitated.
The present invention in a preferred example may be further configured to: in the step b and the step g, the drilling work specifically comprises the following steps:
drilling a rock core pipe by adopting drilling, drilling a soil layer by adopting a phi 108mm drill bit, drilling a hole below a bedrock surface by adopting a phi 91 drill bit, setting the hole position, starting drilling, drilling by adopting a hard alloy drill bit, and drilling to a final hole;
the drilling construction technical key points are that the aperture of ① is phi 90mm (phi 110 mm), the hole depth is 35-45 m, the actual situation is used as the standard, the verticality of ② drill holes is stable, the verticality of the drill holes meets the standard requirement, and the verticality deviation is not more than 1%;
and (3) stopping drilling standard: and drilling 5m after the karst cave passes through the lowest layer, and stopping drilling.
By adopting the technical scheme, the core tube and the coating are utilized for drilling to realize drilling, and the hard alloy drill bit is utilized for realizing drilling.
The present invention in a preferred example may be further configured to: in the step b and the step g, the protection measures required when arranging the grouting holes are specifically as follows:
(1) taking borehole mud retaining wall or casing construction measures for the stratum which is likely to collapse;
(2) casing protecting wall is adopted in shallow filling and other loose layers and in water leakage stratum;
(3) and adopting mud for protecting the wall in a saturated soft cohesive soil layer, a silt layer and a sandy soil layer below the underground water level.
By adopting the technical scheme, the grouting holes are protected according to the field condition, so that the inner parts of the grouting holes are perfect, and the subsequent grouting work is stable.
The present invention in a preferred example may be further configured to: and marking the position of the grouting hole through a bamboo stick after the drilling work is finished.
By adopting the technical scheme, the bamboo stick marking mode is simple and convenient, easy to identify, economical and environment-friendly.
The present invention in a preferred example may be further configured to: in step c, the prepared slurry material is specifically:
(1) single slurry configuration
The cement paste is 42.5R ordinary portland cement, the water cement ratio is 0.8-1.0 (diluted), and 0.5-0.6;
(2) double slurry configuration
The cement is 42.5R ordinary portland cement;
water glass: concentration Be' = 30-40; the water glass accounts for 40% of the cement paste amount, and the parameter is adjusted according to the actual situation on site.
By adopting the technical scheme, when the requirement cannot be met after single-liquid grouting detection, the residual karst cave space is supplemented, filled and blocked by injecting double-slurry.
The present invention in a preferred example may be further configured to: in the step d and the step h, the sleeve lowering valve tube specifically comprises the following steps: the sleeve valve pipe comprises a flower pipe and a solid pipe, the flower pipe is arranged according to the height of a grouting section, clear water is filled into the flower pipe during pipe discharging to overcome buoyancy, the flower pipe is made to fall to the bottom of a hole, the solid pipe is 9.0-10.0 m below the ground, the solid pipe is higher than the ground by a certain height, the flower pipe and the solid pipe are firmly connected, the sleeve valve pipe is integrally and vertically located in the center of the grouting hole, and a conical plug is sleeved at the lower bottom end of the sleeve valve pipe.
Through adopting above-mentioned technical scheme, it is downthehole that the solid pipe guide gets into the slip casting, and the floral tube guides thick liquid at the hole bottom and fills to the solution cavity, and stable in structure is convenient for follow-up slip casting work.
The present invention in a preferred example may be further configured to: in step e and step i, the grouting specifically comprises:
(1) test grouting
Before formal grouting, a grouting test is carried out, and construction parameters such as grouting pressure, cement consumption, mixing ratio, grouting times and the like are finally determined and controlled according to indexes such as cement consumption and the like required by design;
(2) open-loop grouting
Opening the ring: in the early stage of grouting, thin slurry (or clear water) is used for pressurizing and opening the ring, once pressure suddenly drops in the pressurizing process, the slurry inlet amount is increased sharply to indicate that the ring is opened, and formal grouting is started according to the designed proportion after the ring is opened;
(3) grouting
And (3) placing an 1/2 'steel pipe to a position of 1.0-1.5 m in a gap between the sleeve valve pipe and the hole wall, injecting prepared slurry from the 1/2' steel pipe until the hole orifice returns, and pouring the slurry from the hole orifice for multiple times after the slurry surface of the hole orifice sinks.
By adopting the technical scheme, the grouting pressure is ensured in the early stage, and the grouting pump performs grouting and then performs multiple recharging, so that the grouting effect of the fixed pipe is guaranteed.
The present invention in a preferred example may be further configured to: when slurry leakage is serious, clay ball filling, sealing and other leakage stopping measures are adopted.
By adopting the technical scheme, the overflow of slurry in the karst cave is reduced, the reinforcing effect in the karst cave is ensured, and the resource waste is reduced.
The present invention in a preferred example may be further configured to: still include the reserve slip casting measure:
after grouting each hole, inserting the sleeve valve pipe into a phi 20 water pipe, pumping clear water into the sleeve valve pipe to flush the sleeve valve pipe, and sealing the grout pipe opening of the grouting opening with adhesive tape.
By adopting the technical scheme, residual cement slurry in the sleeve valve pipe is washed clean for re-grouting, and a slurry pipe orifice is sealed for re-grouting when the ground subsides in the later excavation process.
In summary, the present invention includes at least one of the following advantages:
this scheme changes the mode of original "side exploration side slip casting" into earlier to carry out the slip casting to the big solution cavity of collusion nature and the serious region that the part fell to bore and consolidates, realizes filling on a large scale fixed back, again to the punctiform development district in other regions, banding development district, the face form development district carries out drilling slip casting in proper order, has reduced the step that all will explore the optional position, effectively improves the efficiency of construction, the slip casting is consolidated better, reduce staff's working force, reduce the wasting of resources, environmental protection safety more, comprehensive economic benefits is high.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the sleeve valve pipe karst grouting construction method disclosed by the invention comprises two steps of big cavern grouting and grouting in other areas:
a: grouting a big karst cave:
a: determining a through big karst cave according to the advanced drilling investigation data;
b: arranging grouting holes according to the region of the communicated big karst cave on site, and drilling to obtain a drilling report;
c: preparing slurry on site, wherein the prepared slurry material is specifically as follows:
(1) single slurry configuration
The cement paste is 42.5R ordinary portland cement, the water cement ratio is 0.8-1.0 (diluted), and 0.5-0.6;
(2) double slurry configuration
The cement is 42.5R ordinary portland cement;
water glass: concentration Be' = 30-40; the water glass accounts for 40% of the cement paste amount, the parameter is adjusted according to the actual situation on site, and when the requirement cannot be met after single-liquid grouting detection, the residual karst cave space is supplemented, filled and blocked by injecting double-slurry.
d: a sleeve valve pipe is lowered, the sleeve valve pipe mainly comprises a phi 48mm PVC appearance, 6-part galvanized grouting pipes, rubber sleeves and sealing rings, and the top end of the sleeve valve pipe is provided with a protective cap which is used for indicating the number of grouting holes;
e: the grouting pump guides the grout to perform grouting through the sleeve valve pipe;
b: grouting in other areas:
f: confirming the punctate development area, the strip development area and the planar development area of the karst cave on site to obtain a measurement lofting report;
g: arranging grouting holes according to the spot development area, the strip development area and the planar development area in sequence according to the field condition, drilling to obtain a drilling report, and performing drilling reports of other areas according to the following principle:
(1) grouting holes beside the cavities (within 1 m) in the punctiform development areas;
(2) in the strip-shaped development area, grouting holes are uniformly distributed along the pile spacing according to the trend of strips, the hole spacing is controlled to be about 2m, and if the field condition has large change, the point positions can be increased or decreased according to the actual field condition;
(3) in the planar development area, the grouting holes are uniformly distributed along the pile spacing according to the planar trend, the hole spacing is controlled to be about 2m, and if the field condition has larger change, the point positions can be increased or decreased according to the actual field condition. Different areas use different drilling schemes, so that grouting work in different karst cave areas can be realized conveniently.
h: lowering a sleeve valve pipe, and marking the number of grouting holes;
i: the grouting pump guides the grout to perform grouting through the sleeve valve pipe.
In the step b and the step g, drilling specifically comprises the following steps:
before drilling, the existence of underground buried objects is known, after the existence of the underground buried objects is confirmed, the rock core pipe is adopted for drilling, the soil layer is drilled by a phi 108mm drill bit, a phi 91 drill bit is adopted below the bedrock surface, the diameter of the drilled hole is not less than phi 110mm, after a hole position is determined, the hole is drilled, and the hard alloy drill bit is adopted for drilling to the final hole.
The drilling construction technical key points are that the aperture of ① is phi 90mm (phi 110 mm), the hole depth is 35-45 m, the actual situation is used as the standard, the verticality of ② drill holes is stable, the verticality of the drill holes meets the standard requirement, and the verticality deviation is not more than 1%;
and (3) stopping drilling standard: and drilling 5m after the karst cave passes through the lowest layer, and stopping drilling.
The protection measures to be carried out when arranging the grouting holes are as follows:
(1) taking borehole mud retaining wall or casing construction measures for the stratum which is likely to collapse;
(2) casing protecting wall is adopted in shallow filling and other loose layers and in water leakage stratum;
(3) and adopting mud for protecting the wall in a saturated soft cohesive soil layer, a silt layer and a sandy soil layer below the underground water level. The grouting holes are protected according to the field conditions, so that the interior of the grouting holes is perfect, and the stability of subsequent grouting work is guaranteed.
And marking the position of the grouting hole through a bamboo stick after the drilling work is finished. The bamboo stick marking mode is simple and convenient, easy to identify, economical and environment-friendly.
In the step d and the step h, the sleeve lowering valve tube specifically comprises the following steps:
the sleeve valve pipe comprises a flower pipe and a solid pipe, the flower pipe is arranged according to the height of a grouting section, clear water is filled into the flower pipe during pipe discharging to overcome buoyancy, the flower pipe is made to fall to the bottom of a hole, the solid pipe is 9.0-10.0 m below the ground, the solid pipe is higher than the ground by a certain height, the flower pipe and the solid pipe are firmly connected, the sleeve valve pipe is integrally and vertically located in the center of the grouting hole, and a conical plug is sleeved at the lower bottom end of the sleeve valve pipe. The solid pipe guides the slurry to enter the grouting hole, and the perforated pipe guides the slurry to be filled to the karst cave at the bottom of the hole, so that the structure is stable, and the subsequent grouting work is facilitated.
In step e and step i, the grouting specifically comprises:
(1) test grouting
Before the grouting is formally started, the following preparation works are fully done.
① study design requirements, geological conditions, taking into account the equipment, equipment staffing required and problems and treatments that may be encountered.
② participate in the construction drawing review to clarify the drawing and technical requirements.
③ construction site measurement line, placing grouting hole site, checking inside, rechecking and visa on Party A to avoid error and leakage, marking each grouting hole site after measurement with bamboo stick, and treating in advance when hidden obstacle is found.
④ to perform overhaul and maintenance on the mechanical equipment.
⑤ the preparation of various grouting materials is well done.
And a grouting test is carried out, and construction parameters such as grouting pressure, cement consumption, mixing proportion, grouting times and the like are finally determined and controlled according to indexes such as cement consumption and the like required by design.
(2) Open-loop grouting
Opening the ring: in the early stage of grouting, slurry (or clear water) is used for pressurizing and opening the ring, once pressure suddenly drops in the pressurizing process, the slurry inlet amount is increased sharply to indicate that the ring is opened, and formal grouting is started according to the designed proportion after the ring is opened.
(3) Grouting
According to the plane arrangement of grouting holes, grouting from outside to inside, and carrying out sectional grouting from bottom to top on an 1/2' grouting core pipe with double plugs from a sleeve valve pipe to the position of a grouting section, wherein the sectional length is 0.3-0.5 m.
① the grout adopts cement paste, the cement is 42.5R ordinary portland cement, the cement needs to be stored by a storage tank, the capacity is 80T, the water cement ratio is 0.8-1.0 (dilute), 0.5-0.6 (concentrated), the cement grout is injected by a BW150 type grouting pump, the grout is stirred by an LJ-300 type stirring barrel on site, the grout is poured into a grout pool after being stirred uniformly and sieved and then is injected, the single-liquid grouting adopts layered grouting, the lower layer karst cave is injected firstly, the lower layer karst cave is injected and stabilized, and then the pipe is lifted to the upper layer karst cave until the upper layer karst cave is injected.
② observing grouting pressure on a pump pressure gauge during grouting, opening the ring to 0.3Mpa, stopping grouting pressure to 1.5-2.0 Mpa, stabilizing pressure for 30-60 minutes, cleaning a valve pipe and pre-opening the ring for one time, repeating the above steps after secondary grouting, and circulating grouting.
③ grouting amount, determining grouting amount according to the volume of the mixing tank and the flow of the slurry during grouting, preparing slurry in the mixing tank, measuring the volume, and inputting the slurry into a grouting pool, wherein the grouting pool is directly connected with a grouting pump, and the grouting amount is controlled by pressure meter and slurry flow during grouting.
In the grouting process, the grouting is stopped immediately when the ground grout leakage or pressure mutation occurs, the reason is found out, and corresponding measures are taken. The cement dosage injected by the single-hole pump is temporarily set to be 30T, and if the dosage exceeds the dosage not yet full of the pump, the cement and water glass double-liquid slurry is adopted for plugging until the designed grouting pressure requirement is met.
And after grouting, adopting pure cement paste, and performing grouting by using a sleeve valve pipe, wherein the grouting pressure is 0.5-1.0 MPa.
And making corresponding construction records in the grouting construction process, and recording parameters such as drilling depth, grouting pressure of each round, grouting amount of each round, grouting time of each round, total grouting amount and the like in detail. And (3) arranging data in time, frequently analyzing and comparing parameters such as grouting flow, grouting pressure and grouting amount of adjacent grouting holes, and estimating grouting effect according to the change condition of each parameter. And analyzing and processing problems existing in the grouting process in time.
The grouting finishing standard is comprehensively determined according to the following conditions:
i, the grouting amount meets the design requirement;
II, the grouting pressure exceeds a design value;
III, ground reverse grouting.
The notes in the grouting process are as follows: the system can be used for observing the settlement, the inclination, the deformation and the displacement of the ground, surrounding buildings and underground pipelines. In the grouting process, the conditions of water return, air exhaust and grout bleeding of adjacent grouting holes are observed, if grout bleeds out of peripheral holes, the grouting effect is good, and grouting can be finished. And making grouting records including grouting pressure, grouting amount, cement consumption and the like. Four copies of the sleeve valve tube grouting record table are filled in and timely reported. The materials of the equipment entering the field are required to have factory pass certificates, and the main materials such as cement must be sampled and inspected (each batch is inspected once), and can be used after passing. The document is reported to the supervision and the owner for signature and verification in time.
Grouting under the pressure of 0.5-1.0 MPa, wherein the grouting is diluted firstly and then concentrated mainly; if the grouting liquid loss in the karst cave is serious, and even when the dosage of the single-hole pump cement injection exceeds 30T, the double-liquid water glass grouting is adopted.
(4) Grouting hole sealing
When slurry is seriously leaked, leakage stoppage measures such as clay ball filling, sealing and the like are adopted, so that the overflow of slurry in the karst cave is reduced, the reinforcing effect in the karst cave is ensured, and the resource waste is reduced. And after the grouting construction is finished, filling and plugging the grouting holes from bottom to top in time by using cement slurry.
And (4) backup grouting measures:
after grouting each hole, inserting the sleeve valve pipe into a phi 20 water pipe, pumping clear water into the sleeve valve pipe to flush the sleeve valve pipe, and sealing the grout pipe opening of the grouting opening with adhesive tape. And (4) washing the residual cement slurry in the sleeve valve pipe to be subjected to repeated grouting, and sealing the slurry pipe orifice to be subjected to repeated grouting when the ground is settled in the later excavation process.
The implementation principle of the embodiment is as follows:
to sum up, this scheme changes the mode of original "survey while grouting" into earlier to the big solution cavity of UNICOM's nature and the regional serious area that falls to bore and consolidate the slip casting, realizes filling on a large scale fixed back, again to other regional punctiform development district, banded development district, the face development district carries out drilling slip casting in proper order, has reduced the step of all exploring the optional position, effectively improves the efficiency of construction, and the slip casting is consolidated better, reduces staff's working strength, reduces the wasting of resources, environmental protection safety more, and comprehensive economic benefits is high.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims (10)

1. The sleeve valve pipe karst grouting construction method is characterized by comprising the following steps of:
a: grouting a big karst cave:
a: determining a through big karst cave according to the advanced drilling investigation data;
b: arranging grouting holes according to the region of the communicated big karst cave on site, and drilling to obtain a drilling report;
c: preparing slurry on site;
d: lowering the sleeve valve pipe, wherein the top end of the sleeve valve pipe is provided with a protective cap, and the number of the grouting holes is marked;
e: the grouting pump guides the grout to perform grouting through the sleeve valve pipe;
b: grouting in other areas:
f: confirming the punctate development area, the strip development area and the planar development area of the karst cave on site to obtain a measurement lofting report;
g: arranging grouting holes according to the spot development area, the strip development area and the planar development area in sequence according to the field condition, and drilling to obtain a drilling report;
h: lowering a sleeve valve pipe, and marking the number of grouting holes;
i: the grouting pump guides the grout to perform grouting through the sleeve valve pipe.
2. The sleeve valve pipe karst grouting construction method according to claim 1,
the drilling report in step g is mainly based on the following principles:
grouting holes beside the cavities (within 1 m) in the punctiform development areas;
in the strip-shaped development area, grouting holes are uniformly distributed along the pile spacing according to the trend of strips, the hole spacing is controlled to be about 2m, and if the field condition has large change, the point positions can be increased or decreased according to the actual field condition;
in the planar development area, the grouting holes are uniformly distributed along the pile spacing according to the planar trend, the hole spacing is controlled to be about 2m, and if the field condition has larger change, the point positions can be increased or decreased according to the actual field condition.
3. The sleeve valve pipe karst grouting construction method according to claim 1, wherein in the step b and the step g, the drilling work is specifically as follows:
drilling a rock core pipe by adopting drilling, drilling a soil layer by adopting a phi 108mm drill bit, drilling a hole below a bedrock surface by adopting a phi 91 drill bit, setting the hole position, starting drilling, drilling by adopting a hard alloy drill bit, and drilling to a final hole;
the drilling construction technical key points are that the aperture of ① is phi 90mm (phi 110 mm), the hole depth is 35-45 m, the actual situation is used as the standard, the verticality of ② drill holes is stable, the verticality of the drill holes meets the standard requirement, and the verticality deviation is not more than 1%;
and (3) stopping drilling standard: and drilling 5m after the karst cave passes through the lowest layer, and stopping drilling.
4. The sleeve valve pipe karst grouting construction method according to claim 2,
in the step b and the step g, the protection measures required when arranging the grouting holes are specifically as follows:
taking borehole mud retaining wall or casing construction measures for the stratum which is likely to collapse;
casing protecting wall is adopted in shallow filling and other loose layers and in water leakage stratum;
and adopting mud for protecting the wall in a saturated soft cohesive soil layer, a silt layer and a sandy soil layer below the underground water level.
5. The karst grouting construction method for the sleeve valve pipe according to claim 4, wherein the position of a grouting hole is marked by a bamboo stick after the drilling work is completed.
6. The karst grouting construction method for the sleeve valve pipe according to claim 1, wherein in the step c, the prepared mud material is specifically:
preparing single slurry:
the cement paste is 42.5R ordinary portland cement, the water cement ratio is 0.8-1.0 (diluted), and 0.5-0.6;
preparing double slurry:
the cement is 42.5R ordinary portland cement;
water glass: concentration Be' = 30-40; the water glass accounts for 40% of the cement paste amount, and the parameter is adjusted according to the actual situation on site.
7. The karst grouting construction method for the sleeve valve pipe according to claim 1, wherein in the step d and the step h, the sleeve valve pipe is lowered specifically as follows: the sleeve valve pipe comprises a flower pipe and a solid pipe, the flower pipe is arranged according to the height of the grouting section, clear water is filled into the flower pipe to overcome buoyancy during pipe descending, the flower pipe is made to fall to the bottom of a hole, the solid pipe is arranged at 9.0-10.0 m below the ground, the flower pipe is firmly connected with the solid pipe, the sleeve valve pipe is integrally and vertically arranged in the center of the grouting hole, and a conical plug is sleeved at the lower bottom end of the sleeve valve pipe.
8. The sleeve valve pipe karst grouting construction method according to claim 1, wherein in the step e and the step i, grouting specifically comprises the following steps:
(1) test grouting
Before formal grouting, a grouting test is carried out, and construction parameters such as grouting pressure, cement consumption, mixing ratio, grouting times and the like are finally determined and controlled according to indexes such as cement consumption and the like required by design;
(2) open-loop grouting
Opening the ring: in the early stage of grouting, thin slurry (or clear water) is used for pressurizing and opening the ring, once pressure suddenly drops in the pressurizing process, the slurry inlet amount is increased sharply to indicate that the ring is opened, and formal grouting is started according to the designed proportion after the ring is opened;
(3) grouting
And (3) placing an 1/2 'steel pipe to a position of 1.0-1.5 m in a gap between the sleeve valve pipe and the hole wall, injecting prepared slurry from the 1/2' steel pipe until the hole orifice returns, and pouring the slurry from the hole orifice for multiple times after the slurry surface of the hole orifice sinks.
9. The karst grouting construction method for the sleeve valve pipe as claimed in claim 8, wherein when slurry loss is serious, plugging measures such as clay ball filling and sealing are taken.
10. The sleeve valve pipe karst grouting construction method according to claim 1, further comprising a backup grouting measure:
after grouting each hole, inserting the sleeve valve pipe into a phi 20 water pipe, pumping clear water into the sleeve valve pipe to flush the sleeve valve pipe, and sealing the grout pipe opening of the grouting opening with adhesive tape.
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