CN114458317A - 60-meter-level ultra-long connecting channel frozen wall thaw collapse grouting system and method - Google Patents
60-meter-level ultra-long connecting channel frozen wall thaw collapse grouting system and method Download PDFInfo
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- CN114458317A CN114458317A CN202111650780.0A CN202111650780A CN114458317A CN 114458317 A CN114458317 A CN 114458317A CN 202111650780 A CN202111650780 A CN 202111650780A CN 114458317 A CN114458317 A CN 114458317A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention discloses a 60-meter-level overlong connecting channel frozen wall thaw collapse grouting system and method, wherein the system and method divide an overlong connecting channel into a bell mouth area, a pump station corner cut area, a pump station area and a connecting channel main body area, grouting holes are arranged outwards in a range uniformly covering the frozen wall, each group of grouting holes are arranged outwards in different directions, 7 grouting holes are arranged in each group of the bell mouth area, 7 grouting holes are arranged in each group of the pump station corner cut area, 9 grouting holes are arranged in each group of the pump station area, and 7 grouting holes are arranged in the connecting channel main body area. Compared with the prior art, the method can effectively control the stratum thaw collapse generated during the freezing construction of the ultra-long connecting channel, and is suitable for ultra-long connecting channels with various lengths.
Description
Technical Field
The invention belongs to the technical field of freezing construction, and relates to a stratum thaw collapse grouting system and method for controlling the freezing construction of an overlong connecting channel, in particular to a freeze wall thaw collapse grouting system and method for a 60-meter overlong connecting channel.
Background
With the increasing utilization and development of underground space in China, the construction of underground buildings such as urban subways is quickened, and for the construction of subway contact channels in rich-water soft soil strata in equiangular regions such as Shanghai, Nanjing and Suzhou, the manual freezing method for reinforcing the strata becomes a common choice, the freezing method for reinforcing the strata has high strength and excellent water-stopping performance, but the thawing and sinking of the strata of the ultralong contact channels are difficult to control after the construction is carried out by the method. Generally, after freezing construction of the connection channel is finished, stratum thawing and sinking are controlled by adopting a tracking grouting filling soil body, the freezing range of the ultra-long connection channel is large, and if grouting positions are unreasonably arranged, adverse effects such as settlement and cracking of surrounding buildings are easily caused, and serious potential safety hazards are generated.
Therefore, for the problem of stratum settlement after the ultra-long connecting channel is frozen for construction, a system and a method suitable for the settlement grouting of the frozen wall of the ultra-long connecting channel need to be researched.
Disclosure of Invention
The technical problem to be solved is as follows: when the ultra-long connecting channel is reinforced by an artificial freezing method, stratum thaw collapse can be generated by freezing and unfreezing in construction, in order to deal with adverse effects generated by stratum thaw collapse, the invention provides a grouting hole system and a method capable of effectively controlling stratum thaw collapse according to the influence range of a freezing wall, and the grouting hole system and the method can deal with ultra-long connecting channels with various lengths.
The technical scheme is as follows: a60-meter-level overlong connecting channel frozen wall thaw collapse grouting system and a method are characterized in that the system divides an overlong connecting channel area into a horn mouth area, a pump station corner cut area, a pump station area and a connecting channel main body area, and grouting holes are arranged outwards in the four areas respectively in different directions for grouting.
Preferably, the grouting holes are symmetrical about the central line of the main body of the communication channel according to the length of (2.5-3.0) m2The density is uniformly distributed in a range covering the frozen wall; 7 grouting holes are arranged outwards in different directions in the horn mouth area at the interval of (1.5-2.0) m; 7 grouting holes are arranged outwards in different directions in a pump station corner cutting area according to the distance of (1.5-2.0) m, 9 grouting holes are arranged outwards in different directions in a pump station area according to the distance of (1.5-2.0) m, and two grouting holes are arranged on the front side of the pump station; the main body area of the communication channel is provided with 7 grouting holes outwards in different directions at intervals of (1.5-2.0) m.
Preferably, the grouting holes are divided into a first grouting hole, a second grouting hole, a third grouting hole, a fourth grouting hole, a fifth grouting hole, a sixth grouting hole, a seventh grouting hole, an eighth grouting hole, a ninth grouting hole, a tenth grouting hole, an eleventh grouting hole, a twelfth grouting hole, a thirteenth grouting hole, a fourteenth grouting hole, a fifteenth grouting hole and a sixteenth grouting hole according to arrangement positions.
Preferably, the first grouting hole is arranged at the position, where the arch of the communication channel is 90 degrees outwards from the horizontal center line of the communication channel; the second grouting hole and the ninth grouting hole are arranged at two sides of the arch top of the communication channel and are outward at 60 degrees and 120 degrees from the horizontal center line of the communication channel; the third grouting hole and the eighth grouting hole are arranged at two sides of the connection channel and are outward at 0-180 degrees relative to the horizontal center line of the connection channel; the fifth grouting hole and the sixth grouting hole are arranged on two sides of the bottom of the pump station and are 270 degrees outward from the horizontal center line of the communication channel; the fourth grouting hole and the seventh grouting hole are arranged at two sides of the pump station and are outward at 0-180 degrees from the horizontal center line of the communication channel; the tenth grouting hole and the eleventh grouting hole are arranged on two sides of the front side of the pump station and are 0-degree outward of the horizontal center line of the communication channel; the fourteenth grouting hole and the fifteenth grouting hole are arranged on two sides of the pump station tangential angle and are outward at 90 degrees from the tangential angle; the twelfth grouting hole is arranged at 270 degrees of the horizontal center line of the communication channel and 345 degrees of the tunnel center line outwards; the thirteenth grouting hole is arranged outward of 255 ° of the horizontal center line of the communication passage and 345 ° of the tunnel center line.
The 60-meter-level ultra-long connecting channel frozen wall thaw collapse grouting system and the method comprise the following steps:
a. grouting flow: selecting a position hole, dredging a reserved hole, inserting a grouting pipe in a vibration mode, installing a blowout preventer, grouting, cleaning the grouting pipe, sealing an orifice, and shifting the grouting pipe
b. Grouting materials and parameters: the melt-deposition grouting adopts single-fluid grouting, the grouting follows the principle of small amount, multiple times and uniformity, the grouting pressure is (0.3-0.5) MPa, and the grouting flow is preferably controlled to be about 10L/min.
c. Grouting amount: the grouting amount of each area is generally calculated according to 15% of the melting volume of frozen soil in the area, the grouting amount of each hole can be obtained according to the melting rate of the specific area, and the actual grouting amount is slightly larger than the calculated value.
d. Grouting time: and (3) stopping freezing, beginning to perform melt-precipitation grouting for 1 month, wherein the duration is 3-4 months, the side wall of the communication channel is 3 months, the vault part of the communication channel is 3 months, and the pump station part is 4 months.
e. Grouting parts: grouting the vault frozen soil part and the side wall frozen soil part of the communication channel at the inner side and the outer side of the freezing curtain, and grouting the frozen soil part of the pump station only at the inner side of the freezing curtain.
f. Grouting process: grouting outside the freezing curtain, inserting a phi 32 grouting floral tube into the reserved grouting hole, wherein the insertion depth is suitable for just penetrating through the freezing wall, arranging a grout return prevention device on an orifice, performing layered grouting, and pulling out the floral tube during the next grouting without pulling out the pipe during the next grouting; and (3) inserting a phi 32 grouting floral tube into the reserved grouting hole by measuring grouting in the freezing curtain, wherein the inserting depth is suitable for the grouting to just penetrate through the structural layer, a hole opening is provided with a grout return prevention device, grouting is carried out in a layering manner, the floral tube is not pulled out in the grouting process, and the floral tube is externally inserted in the next grouting process.
g. Cleaning a grouting hole: after the grouting of each hole is finished, the injection amount is preferably slightly larger than the volume of the reserved grouting pipe so as to facilitate re-injection.
Advantageous effects
Compared with the prior art, the invention has the following advantages:
(1) the invention relates to a 60-meter-level ultra-long connecting channel frozen wall thaw collapse grouting system and method, which are expressed by (2.5-3.0) m2The density uniformly covers the range of the frozen wall, and grouting holes are arranged, so that formation melting and sinking generated during construction of the ultra-long connecting channel can be effectively controlled according to the influence range of the frozen wall.
(2) The grouting system and method of the invention are suitable for the thaw settlement grouting of the ultra-long connecting channels with various lengths.
Drawings
FIG. 1 is a schematic regional view of a 60-meter ultra-long communication channel frozen wall thaw collapse grouting system and method of the present invention;
FIG. 2 is a section A-A of FIG. 1;
FIG. 3 is a section B-B of FIG. 1;
FIG. 4 is a section C-C of FIG. 1;
FIG. 5 is a cross-section D-D of FIG. 1;
description of reference numerals:
1-first grouting hole, 2-second grouting hole, 3-third grouting hole, 4-fourth grouting hole, 5-fifth grouting hole, 6-sixth grouting hole, 7-seventh grouting hole, 8-eighth grouting hole, 9-ninth grouting hole, 10-tenth grouting hole, 11-eleventh grouting hole, 12-twelfth grouting hole, 13-thirteenth grouting hole, 14-fourteenth grouting hole, 15-fifteenth grouting hole, 16-horn mouth region, 17-pump station corner cutting region, 18-pump station region, 19-communication channel body region, 20-tunnel center line, 21-communication channel body center line, 22-communication channel horizontal center line.
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, procedures, or conditions of the invention may be made without departing from the spirit and substance of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art.
Example 1
A66 m ultra-long connecting channel of a certain city passes through an overpass pile foundation, a delivery station, a farm product market, a part of residences and the like are arranged on the north side, and an administrative service center, a grain transportation company and the like are arranged on the south side. The stratum sequentially comprises from top to bottom: silt fine sand <2-4-5>, silt sand inclusion <2-4-4>, medium fine sand <2-5> and silty clay <3-1 >. The ultra-long connecting channel is buried to a depth of 14m, foundation reinforcement is carried out by adopting an artificial freezing method, construction is carried out by adopting a mining method, and in order to reduce adverse effects of freeze thawing, thawing and depositing grouting schemes are adopted to control uneven settlement of the ground.
The system and the method for the thawing-sinking grouting of the frozen wall of the 60-meter-level ultra-long connecting channel adopted by the engineering have the following specific system and method schemes:
a. pre-burying phi 48 multiplied by 4(mm) grouting pipes during temporary primary lining after excavation, numbering the grouting pipes after the depth reaches the back of a wood board, taking the central line of the main body of the communication channel as a symmetry axis, and setting the grouting holes to be 2.5-3.0 m in density2A uniform coverageFreezing the curtain, and reserving grouting holes by using the related pipe pieces of the original tunnel.
b. Dividing the whole ultra-long connecting channel into a horn mouth area, a pump station corner cutting area, a pump station area and a connecting channel subject area, wherein 7 grouting holes are outwards arranged in different directions in the horn mouth area at intervals of (1.5-2.0) m; 7 grouting holes are arranged outwards in different directions in a pump station corner cutting area according to the distance of (1.5-2.0) m, 9 grouting holes are arranged outwards in different directions in a pump station area according to the distance of (1.5-2.0) m, and two grouting holes are arranged on the front side of the pump station; the main body area of the communication channel is provided with 7 grouting holes outwards in different directions at intervals of (1.5-2.0) m.
c. The first grouting hole is arranged outside the horizontal center line of the arch top and the horizontal center line of the communication channel by 90 degrees; the second grouting hole and the ninth grouting hole are arranged at two sides of the arch top of the communication channel and are outward at 60 degrees and 120 degrees from the horizontal center line of the communication channel; the third grouting hole and the eighth grouting hole are arranged at two sides of the connection channel and are outward at 0-180 degrees relative to the horizontal center line of the connection channel; the fifth grouting hole and the sixth grouting hole are arranged on two sides of the bottom of the pump station and are 270 degrees outward from the horizontal center line of the communication channel; the fourth grouting hole and the seventh grouting hole are arranged at two sides of the pump station and are outward at 0-180 degrees from the horizontal center line of the communication channel; the tenth grouting hole and the eleventh grouting hole are arranged on two sides of the front side of the pump station and are 0-degree outward of the horizontal center line of the communication channel; the fourteenth grouting hole and the fifteenth grouting hole are arranged on two sides of the pump station tangential angle and are outward at 90 degrees from the tangential angle; the twelfth grouting hole is arranged at 270 degrees of the horizontal center line of the communication channel and 345 degrees of the tunnel center line outwards; the thirteenth grouting hole is arranged outward of 255 ° of the horizontal center line of the communication passage and 345 ° of the tunnel center line.
d. And (3) starting to perform melt-precipitation grouting for 1 month after the freezing is stopped, wherein the duration is 2-4 months, the side wall of the communication channel is 2 months, the vault part of the communication channel is 3 months, and the pump station part is 4 months.
e. Grouting the vault frozen soil part and the side wall frozen soil part of the communication channel at the inner side and the outer side of the freezing curtain, and grouting the frozen soil part of the pump station only at the inner side of the freezing curtain.
f. Grouting outside the freezing curtain, inserting a phi 32 grouting floral tube into the reserved grouting hole, wherein the insertion depth is suitable for just penetrating through the freezing wall, arranging a grout return prevention device on an orifice, performing layered grouting, and pulling out the floral tube during the next grouting without pulling out the pipe during the next grouting; and (3) inserting a phi 32 grouting floral tube into the reserved grouting hole by measuring grouting in the freezing curtain, wherein the inserting depth is suitable for the grouting to just penetrate through the structural layer, a hole opening is provided with a grout return prevention device, grouting is carried out in a layering manner, the floral tube is not pulled out in the grouting process, and the floral tube is externally inserted in the next grouting process.
g. The grouting material and parameters are characterized in that an SYB 50-45II hydraulic grouting pump is adopted, hole slurry is single slurry, the single slurry cement strength grade is PO.42.5 grade, the water cement ratio is 0.8, the grouting pressure is (0.3-0.5) MPa, the grouting flow is controlled to be about 10L/min, and the grouting amount of each area is calculated according to 15% of the melting volume of frozen soil of the area.
h. The grouting follows the principle of 'multipoint, small amount, multiple times and uniformity' in a progressive manner, and after the grouting of each hole is finished, the injection amount is cleaned by water slightly larger than the volume of the reserved grouting pipe so as to facilitate re-injection.
Claims (5)
1. A60-meter-level overlong connecting channel frozen wall thaw collapse grouting system and a method are characterized in that the system divides an overlong connecting channel area into a horn mouth area (16), a pump station corner cut area (17), a pump station area (18) and a connecting channel main body area (19), and grouting holes are arranged outwards in the four areas in different directions respectively and are used for grouting.
2. The system and the method for thawing and depositing frozen wall of 60-meter-scale ultra-long communication channel according to claim 1, wherein the grouting holes are symmetric about a communication channel main body center line (21) and are arranged in a range of (2.5-3.0) m2The density is uniformly distributed in a range covering the frozen wall; 7 grouting holes are arranged outwards in different directions in the horn mouth area (16) at the interval of (1.5-2.0) m; 7 grouting holes are arranged outwards in different directions in a pump station corner cutting area (17) at intervals of (1.5-2.0) m, 9 grouting holes are arranged outwards in different directions in a pump station area (18) at intervals of (1.5-2.0) m, and two grouting holes are arranged on the front side of a pump station; 7 grouting holes are arranged outwards in different directions in the main body area (19) of the communication channel at intervals of (1.5-2.0) m.
3. The system and the method for thawing and depositing the frozen wall of the 60-meter-scale ultra-long connecting channel are characterized in that the grouting holes are divided into a first grouting hole (1), a second grouting hole (2), a third grouting hole (3), a fourth grouting hole (4), a fifth grouting hole (5), a sixth grouting hole (6), a seventh grouting hole (7), an eighth grouting hole (8), a ninth grouting hole (9), a tenth grouting hole (10), an eleventh grouting hole (11), a twelfth grouting hole (12), a thirteenth grouting hole (13), a fourteenth grouting hole (14), a fifteenth grouting hole (15) and a sixteenth grouting hole (16) according to arrangement positions.
4. The system and the method for thawing and depositing the frozen wall of the 60-meter-scale ultra-long communication channel are characterized in that the first grouting holes (1) are arranged 90 degrees outwards from the horizontal center line (22) of the vault and the communication channel; the second grouting hole (2) and the ninth grouting hole (9) are arranged at two sides of the arch top of the communication channel and are outward at 60 degrees and 120 degrees from the horizontal center line (22) of the communication channel; the third grouting hole (3) and the eighth grouting hole (8) are arranged at two sides of the connection channel and are outward at 0-180 degrees from the horizontal center line (22) of the connection channel; the fifth grouting hole (5) and the sixth grouting hole (6) are arranged on two sides of the bottom of the pump station and are 270 degrees outwards from the horizontal center line (22) of the communication channel; the fourth grouting hole (4) and the seventh grouting hole (7) are arranged at the two sides of the pump station and are outward at 0-180 degrees relative to the horizontal center line (22) of the communication channel; the tenth grouting hole (10) and the eleventh grouting hole (11) are arranged at two sides of the front side of the pump station and are 0 degree outward of the horizontal center line (22) of the communication channel; the fourteenth grouting hole (14) and the fifteenth grouting hole (15) are arranged on two sides of the pump station tangential angle and are outward at 90 degrees from the tangential angle; the twelfth grouting hole (12) is arranged at 270 degrees of the horizontal center line (22) of the communication channel and 345 degrees of the tunnel center line outwards; the thirteenth grouting hole (13) is arranged at 255 degrees of the horizontal center line (22) of the communication channel and the center of the tunnel.
5. The system and the method for the thawing-deposition grouting of the frozen wall of the 60-meter-scale ultra-long communication channel are characterized by comprising the following steps of:
a. grouting flow: selecting a position hole, dredging a reserved hole, inserting a grouting pipe in a vibration mode, installing a blowout preventer, grouting, cleaning the grouting pipe, sealing an orifice, and shifting the grouting pipe
b. Grouting materials and parameters: the melt-deposition grouting adopts single-fluid grouting, the grouting follows the principle of small amount, multiple times and uniformity, the grouting pressure is (0.3-0.5) MPa, and the grouting flow is preferably controlled to be about 10L/min.
c. Grouting amount: the grouting amount of each area is generally calculated according to 15% of the melting volume of frozen soil in the area, the grouting amount of each hole can be obtained according to the melting rate of the specific area, and the actual grouting amount is slightly larger than the calculated value.
d. Grouting time: and (3) stopping freezing, beginning to perform melt-precipitation grouting for 1 month, wherein the duration is 3-4 months, the side wall of the communication channel is 3 months, the vault part of the communication channel is 3 months, and the pump station part is 4 months.
e. Grouting parts: grouting the vault frozen soil part and the side wall frozen soil part of the communication channel at the inner side and the outer side of the freezing curtain, and grouting the frozen soil part of the pump station only at the inner side of the freezing curtain.
f. Grouting process: grouting outside the freezing curtain, inserting a phi 32 grouting floral tube into the reserved grouting hole, wherein the insertion depth is suitable for just penetrating through the frozen wall, arranging a grout return prevention device at the hole opening, performing layered grouting, and pulling out the floral tube during the next grouting without pulling out the pipe during the grouting process; and (3) inserting a phi 32 grouting floral tube into the reserved grouting hole by measuring grouting in the freezing curtain, wherein the insertion depth is suitable for the grouting to just penetrate through the structural layer, a grout return prevention device is arranged on the hole, grouting is performed in a layering manner, the floral tube is not pulled out in the grouting process, and the floral tube is externally inserted in the next grouting process.
g. Cleaning a grouting hole: after the grouting of each hole is finished, the injection amount is preferably slightly larger than the volume of the reserved grouting pipe so as to facilitate re-injection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111650780.0A CN114458317A (en) | 2021-12-26 | 2021-12-26 | 60-meter-level ultra-long connecting channel frozen wall thaw collapse grouting system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111650780.0A CN114458317A (en) | 2021-12-26 | 2021-12-26 | 60-meter-level ultra-long connecting channel frozen wall thaw collapse grouting system and method |
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| CN202111650780.0A Pending CN114458317A (en) | 2021-12-26 | 2021-12-26 | 60-meter-level ultra-long connecting channel frozen wall thaw collapse grouting system and method |
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