CN107762534B - Full-hole one-time rapid grouting construction method - Google Patents
Full-hole one-time rapid grouting construction method Download PDFInfo
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- CN107762534B CN107762534B CN201710973943.6A CN201710973943A CN107762534B CN 107762534 B CN107762534 B CN 107762534B CN 201710973943 A CN201710973943 A CN 201710973943A CN 107762534 B CN107762534 B CN 107762534B
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- 238000010276 construction Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 25
- 239000011440 grout Substances 0.000 claims description 23
- 238000005553 drilling Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 5
- 235000019353 potassium silicate Nutrition 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 238000004873 anchoring Methods 0.000 claims description 4
- BNIILDVGGAEEIG-UHFFFAOYSA-L disodium hydrogen phosphate Chemical compound [Na+].[Na+].OP([O-])([O-])=O BNIILDVGGAEEIG-UHFFFAOYSA-L 0.000 claims description 4
- 230000009191 jumping Effects 0.000 claims description 4
- 238000004080 punching Methods 0.000 claims description 4
- 239000002390 adhesive tape Substances 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000009792 diffusion process Methods 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 8
- 239000002689 soil Substances 0.000 abstract description 8
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000004576 sand Substances 0.000 abstract description 3
- 238000013517 stratification Methods 0.000 abstract description 2
- 238000007569 slipcasting Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000004744 fabric Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000011378 shotcrete Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Architecture (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a full-hole one-time rapid grouting construction method which comprises the processes of hole distribution, grouting pipe manufacturing and proportioning, grouting and the like, realizes full-hole one-time grouting, is suitable for the textures of backfill soil, mucky soil, a riprap layer, a sand layer, a full and strong stratification layer and the like, and has good grouting effect.
Description
Technical Field
The invention relates to a one-time rapid grouting construction method for a whole hole.
Background
The grouting technology is widely applied to the field of tunnel construction in China, and is particularly applied to over-weathered grooves, broken zones, water-rich weak surrounding rock grouting water plugging and stratum reinforcement; the types include full-section, half-section, peripheral and local curtain grouting, single-hole grouting and the like; the main grouting mode mainly comprises a forward mode and a backward mode, and the grout stopping wall is made of molded concrete and has the thickness of more than 2 m; the full-face, peripheral or local curtain grouting cloth holes are injected in a hole distribution mode through the full-face and the upper half-face, the whole grouting period is long, the grouting effect is limited, and how to realize one-time quick full-hole grouting is achieved, so that grout can be uniformly diffused to each section of the grouting hole, the full-hole grouting effect is ensured, and further deep research and experiments are worth.
The traditional grouting technology mainly adopts double-liquid grouting as a main material, a forward grouting mode and a backward grouting mode are adopted, and a sleeve pipe with the diameter of 127 multiplied by 5mm and the length of 5m is arranged at the front section of each grouting hole; the sleeve section adopts a drill bit with the diameter of 130mm to form a hole, and the subsequent grouting section adopts a drill bit with the diameter of 94mm to form a hole; the grouting pressure is mainly medium pressure, 2.5-4.0 times of hydrostatic pressure is generally adopted, and the grouting sequence is from outside to inside.
No matter the formula is marching type, retreat the formula, the thick liquid can not even diffusion, and the cloth hole is more in quantity, and the grout stopping wall adopts the mould to build the concrete, and thickness is big, should not operate, and whole slip casting cycle is long-consuming, and the leakproofness of grout stopping wall is poor, and the later stage is difficult for chiseling, and the scope that the thick liquid setting time is adjustable is little, and the slip casting effect has certain limitation, and the earth's surface uplift value is great among the slip casting process.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a full-hole one-time rapid grouting construction method which is suitable for the textures of backfill soil, mucky soil, a riprap layer, a sand layer, a full-graded layer, a strong-graded layer and the like and has good grouting effect.
In order to solve the technical problems, the invention adopts the following technical scheme:
a full-hole one-time rapid grouting construction method comprises the following steps:
A. cloth hole
Excavating a section, injecting full-section grout into the upper half section, drilling a plurality of grouting holes, reserving 5m as a grout stopping rock mass, and excavating a reinforcing ring with the radius of 1m outside an outline according to 3m, wherein the length of each grouting hole is 20m, the excavating is 15 m;
the punching is carried out according to the conditions that the outer ring is firstly carried out, the inner ring is carried out, the lower part is carried out, the upper part is carried out, the left part and the right part are symmetrical, and the hole jumping construction is carried out in the same sequence, so that the disturbance to the stratum is reduced as much as possible;
the grout stopping wall adopts C25 mesh concrete with the thickness of 80cm, three layers of reinforcing meshes are arranged, and a coarse rib framework with the diameter of more than 22mm is arranged to be firmly welded with the arch center;
B. manufacturing grouting pipe
The grouting pump pipe comprises a main body of a grouting pipe, wherein a plurality of sections of PVC pipes fixedly connected through a straight joint form the main body of the grouting pipe, each PVC pipe is provided with a hole, each hole is wrapped by a rubber belt, one end of the grouting pipe is connected with a first wire guide pipe with a tapered tip, and the other end of the grouting pipe is provided with a screw thread for connecting with a grouting pump pipe;
wherein each section of PVC pipe is 4m long, 5 sections in total, and a group of hole pairs are arranged at intervals of 1 m;
C. ingredients
75% of common double-fluid slurry (1:1:1, water glass 38 Be', initial setting for 40-50 s, final setting for 5min) and 25% of superfine cement slurry;
D. grouting
One end of a first yarn guide pipe at one end of each grouting pipe is quickly inserted into each punched grouting hole, an orifice is anchored and blocked by adopting an anchoring agent, the other end of each grouting pipe is connected with a grouting pump pipe through a screw thread to start grouting, and grout breaks through a rubber belt and overflows from the grouting holes to realize primary full-hole grouting;
wherein: drilling a hole for 20m at a low speed for one time, and quickly inserting a grouting pipe; the grouting pressure of the lower half section is controlled within 2.5MPa, the grouting pressure of the upper half section is controlled within 1.2MPa, and the grouting pressure of the area of the arch part close to the pipeline is controlled within 0.8 MPa;
finishing standard of single-hole grouting: grouting amount and grouting pressure are controlled, the porosity is controlled at 10 percent, and each linear meter is about 0.3m3The slurry has a total slurry content of not more than 15 percent of porosity.
Furthermore, the diameter of slip casting hole is 75mm, the diameter of slip casting pipe is 25mm, to the aperture of hole is 8mm, first seal wire pipe is by the tapering toper point of 20mm seal wire pipe.
Furthermore, a certain amount of disodium hydrogen phosphate is added in the batching process, so that the setting time of the double-liquid slurry in high-temperature weather can be effectively controlled.
Furthermore, the average number of the grouting holes per square meter on the upper half section of the section is 4.
Compared with the prior art, the invention has the beneficial technical effects that:
1. punching once, perforating the PVC grouting pipe in the whole length (the hole interval is 1m), uniformly diffusing the grout in the setting time of 40-50 s, and finishing a grouting hole within 2h to realize rapid grouting;
2. the three layers of the reinforcing steel bar nets are sprayed with concrete through C25 nets with the thickness of 80cm, and thick rib frameworks with the diameter of more than phi 22mm are arranged to be firmly welded with the arch center, so that the thickness of the grout stop wall is effectively reduced, and the grout leakage phenomenon is avoided;
3. the setting time of the double-slurry is effectively controlled, the slurry can be uniformly diffused, the slurry concentration effect is avoided, the surface swelling value (within 10 cm) is reduced, and the swelling is balanced;
4. through grouting tests, the full-hole one-time grouting technology can meet the requirements of various stratums (suitable for backfill soil, mucky soil, a riprap layer, a sand layer, a full-strong stratification layer) and has ideal grouting effect.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 is a schematic view of a grout tube;
FIG. 2 is an enlarged view at A;
FIG. 3 is a cross-sectional view at B;
description of reference numerals: 1-PVC pipe; 2-a straight joint; 3-hole alignment; 4-adhesive tape; 5-a first wire guide tube; 6-threading; 7-valve.
Detailed Description
As shown in fig. 1, a full-hole one-time rapid grouting construction method includes the following steps:
A. cloth hole
Excavating a section, injecting full-section grout into the upper half section, drilling a plurality of grouting holes, reserving 5m as a grout stopping rock mass, and excavating a reinforcing ring with the radius of 1m outside an outline according to 3m, wherein the length of each grouting hole is 20m, the excavating is 15 m;
the punching is carried out according to the conditions that the outer ring is firstly carried out, the inner ring is carried out, the lower part is carried out, the upper part is carried out, the left part and the right part are symmetrical, and the hole jumping construction is carried out in the same sequence, so that the disturbance to the stratum is reduced as much as possible;
the grout stopping wall adopts C25 mesh concrete with the thickness of 80cm, three layers of reinforcing meshes are arranged, and a coarse rib framework with the diameter of more than 22mm is arranged to be firmly welded with the arch center;
B. manufacturing grouting pipe
The grouting pump pipe comprises a main body of a grouting pipe, wherein a plurality of sections of PVC pipes 1 fixedly connected through a straight joint 2 form the main body of the grouting pipe, each PVC pipe is provided with a hole, each hole is wrapped by a rubber belt, one end of the grouting pipe is connected with a first guide wire pipe 5 with a tapered tip, and the other end of the grouting pipe is provided with a screw thread 6 for being connected with a grouting pump pipe; the grouting pipe is also provided with a valve 7;
wherein each section of PVC pipe is 4m long, 5 sections in total, and a group of hole pairs are arranged at intervals of 1 m;
C. ingredients
75% of common double-fluid slurry (1:1:1, water glass 38 Be', initial setting for 40-50 s, final setting for 5min) and 25% of superfine cement slurry;
D. grouting
One end of a first yarn guide pipe at one end of each grouting pipe is quickly inserted into each punched grouting hole, an orifice is anchored and blocked by adopting an anchoring agent, the other end of each grouting pipe is connected with a grouting pump pipe through a screw thread to start grouting, and grout breaks through a rubber belt and overflows from the grouting holes to realize primary full-hole grouting;
wherein: drilling a hole for 20m at a low speed for one time, and quickly inserting a grouting pipe; the grouting pressure of the lower half section is controlled within 2.5MPa, the grouting pressure of the upper half section is controlled within 1.2MPa, and the grouting pressure of the area of the arch part close to the pipeline is controlled within 0.8 MPa;
finishing standard of single-hole grouting: grouting amount and grouting pressure are controlled, the porosity is controlled at 10 percent, and each linear meter is about 0.3m3The slurry has a total slurry content of not more than 15 percent of porosity.
The diameter of the grouting hole is 75mm, the diameter of the grouting pipe is 25mm, the aperture of the grouting pipe is 8mm, and the first wire guide pipe is tapered into a conical tip by a 20mm wire guide pipe.
And a certain amount of disodium hydrogen phosphate is added in the batching process, so that the setting time of the double-liquid slurry in high-temperature weather can be effectively controlled.
And 4 grouting holes are drilled on the upper half section of the section on average per square meter.
Example 1
Research and development are carried out by taking curtain grouting construction of an ultra-shallow buried tunnel penetrating through an urban main road under the condition of sea-bound water and weak surrounding rock as a support;
the tunnel passes through an urban traffic main road under the tunnel and is close to an overhead bridge pier, the ground surface traffic flow is large, pipelines are dense, and the number of the pipelines is more than 20, namely 6, and some unknown pipelines are arranged;
the depth of the underpass section is shallow (5.4-14.3 m), the stratum in the vault range mainly comprises miscellaneous filling soil, silt, residual soil and fully-strongly weathered granite, and the underpass section is communicated with seawater, has poor self-stabilizing capability and has the maximum daily water inflow of 1700m3The whole tunnel is positioned below the normal water level;
the whole grouting process comprises the following steps:
firstly, hole distribution: excavating a square meter with a section of 58.99 square meters, adopting the upper half section to inject full-section grout, and 120 grouting holes, wherein the upper part is 37, the middle part is 53, the lower part is 30, the grouting length is 20m, excavating is 15m, reserving a grout stopping rock plate of 5m, excavating a reinforcing ring of 3m outside a contour line, and the diffusion radius is 1 m;
II, working: 3 drillers and 6 grouters with a total of 9 workers and one shift for 8 hours are operated uninterruptedly;
material III: 75% of common double-fluid slurry (1:1:1, water glass 38 Be', initial setting for 40-50 s, final setting for 5min) and 25% of superfine cement slurry; the addition of a certain amount of disodium hydrogen phosphate can effectively control the setting time of the double-liquid slurry in high-temperature weather;
fourthly, the machine: a small multifunctional drilling machine, a double-liquid grouting machine, a high-speed shearing mixer and a full-automatic grouting recorder;
grouting: drilling a hole for 20m at a low speed, quickly inserting a grouting pipe, anchoring and plugging an orifice, and grouting the whole hole at one time;
drilling according to the steps of firstly performing outer ring and inner ring, firstly performing lower and then performing upper, performing bilateral symmetry, and performing alternate hole jumping construction in the same sequence, so that disturbance to the stratum is reduced as much as possible;
seventhly, the grout stopping wall adopts C25 mesh sprayed concrete with the thickness of 80cm, three layers of reinforcing meshes are arranged, and a thick rib framework with the diameter of more than phi 22 is arranged to be firmly welded with the arch center;
drilling a phi 75mm drill hole, sending the drill hole into a phi 25mm self-made PVC grouting pipe, opening a pair of hole pairs (the hole diameter is 8mm) at the interval of 1m, wrapping the hole pairs by using a rubber belt and a plastic adhesive tape, leading the front end of the grouting pipe to be tapered into a cone-shaped tip by using a 20mm guide wire pipe, and connecting the cone-shaped tip with a screw thread of the grouting pipe, and reserving a screw thread at the tail end to be connected with a grouting pump pipe;
ninthly, grouting pressure, controlling the lower half section within 2.5MPa, controlling the upper half section within 1.2MPa, and controlling the area of the arch part close to the pipeline within 0.8 MPa;
⑩ standard for finishing single-hole grouting, including double control of grouting amount and grouting pressure, porosity controlled at 10%, and 0.3 m/linear meter3The slurry has a total slurry content of not more than 15 percent of porosity.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (3)
1. A full-hole one-time rapid grouting construction method is characterized by comprising the following steps:
A. arranging holes and excavating the cross section, injecting full-section grout into the upper half cross section, drilling a plurality of grouting holes, wherein the length of each grouting hole is 20m, excavating is 15m, 5m is reserved as a grout stopping rock, and a reinforcing ring with the diameter of 3m is arranged outside an excavating contour line and the diffusion radius is 1 m;
the punching is carried out according to the conditions that the outer ring is firstly carried out, the inner ring is carried out, the lower part is carried out, the upper part is carried out, the left part and the right part are symmetrical, and the hole jumping construction is carried out in the same sequence, so that the disturbance to the stratum is reduced as much as possible;
the grout stopping wall adopts C25 mesh concrete with the thickness of 80cm, three layers of reinforcing meshes are arranged, and a coarse rib framework with the diameter of more than 22mm is arranged to be firmly welded with the arch center;
B. manufacturing grouting pipe
The grouting pump pipe comprises a main body of a grouting pipe, wherein a plurality of sections of PVC pipes fixedly connected through a straight joint form the main body of the grouting pipe, each PVC pipe is provided with a hole, each hole is wrapped by a rubber belt and a plastic adhesive tape, one end of the grouting pipe is connected with a first guide wire pipe with a tapered tip, and the other end of the grouting pipe is provided with a screw thread for connecting with a grouting pump pipe;
wherein each section of PVC pipe is 4m long, 5 sections in total, and a group of hole pairs are arranged at intervals of 1 m;
C. ingredients
75% of common double-fluid slurry and 25% of superfine cement slurry; wherein 75% of common double-fluid slurry is prepared by mixing cement slurry and water glass according to the volume ratio of 1:1, the water glass 38 Be' is initially set for 40-50 s, and the final set is 5 min;
D. grouting
One end of a first yarn guide pipe at one end of each grouting pipe is quickly inserted into each punched grouting hole, an orifice is anchored and blocked by adopting an anchoring agent, the other end of each grouting pipe is connected with a grouting pump pipe through a screw thread to start grouting, and grout breaks through a rubber belt and overflows from the grouting holes to realize primary full-hole grouting; the diameter of the grouting hole is 75mm, the diameter of the grouting pipe is 25mm, the aperture of the hole is 8mm, and the first wire guide pipe is tapered into a conical tip by a 20mm wire guide pipe; a valve is arranged on the grouting pipe;
wherein: drilling a hole for 20m at a low speed for one time, and quickly inserting a grouting pipe; the grouting pressure of the lower half section is controlled within 2.5MPa, the grouting pressure of the upper half section is controlled within 1.2MPa, and the grouting pressure of the area of the arch part close to the pipeline is controlled within 0.8 MPa;
finishing standard of single-hole grouting: grouting amount and grouting pressure are controlled, the porosity is controlled at 10 percent, and the thickness of each linear meter is 0.3m3The slurry has a total slurry content of not more than 15 percent of porosity.
2. The full-hole one-time rapid grouting construction method according to claim 1, characterized in that: a certain amount of disodium hydrogen phosphate is added in the batching process, so that the setting time of the double-liquid slurry in high-temperature weather can be effectively controlled.
3. The full-hole one-time rapid grouting construction method according to claim 1, characterized in that: and 4 grouting holes are arranged on the upper half section of the section on average per square meter.
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| CN102128038B (en) * | 2011-01-26 | 2013-11-13 | 北京中铁瑞威基础工程有限公司 | Quick construction method for tunnel pipe shed |
| CN106638644B (en) * | 2016-12-29 | 2019-05-03 | 中国葛洲坝集团基础工程有限公司 | A kind of deep sand gravel layer provisions for grouting and the method for carrying out comprehensive grouting using the device |
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