CN114232598A - Grouting isolation wall for protecting existing building/structure foundation - Google Patents
Grouting isolation wall for protecting existing building/structure foundation Download PDFInfo
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- CN114232598A CN114232598A CN202111401442.3A CN202111401442A CN114232598A CN 114232598 A CN114232598 A CN 114232598A CN 202111401442 A CN202111401442 A CN 202111401442A CN 114232598 A CN114232598 A CN 114232598A
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- 238000002955 isolation Methods 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 67
- 239000010959 steel Substances 0.000 claims abstract description 67
- 239000002689 soil Substances 0.000 claims abstract description 46
- 239000007788 liquid Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002131 composite material Substances 0.000 claims abstract description 13
- 239000004567 concrete Substances 0.000 claims abstract description 12
- 238000005553 drilling Methods 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 9
- 235000019353 potassium silicate Nutrition 0.000 claims description 7
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 239000004570 mortar (masonry) Substances 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 25
- 238000000034 method Methods 0.000 abstract description 9
- 238000009435 building construction Methods 0.000 abstract description 2
- 239000011440 grout Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 238000007569 slipcasting Methods 0.000 description 4
- 230000002411 adverse Effects 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0275—Retaining or protecting walls characterised by constructional features cast in situ
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Hydrology & Water Resources (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention relates to a grouting isolation wall for protecting the foundation of an existing building/structure, which is prepared by the following steps: a. digging a groove on the outer side of the existing building/structure, and drilling a hole in the groove by using a down-the-hole drill; b. inserting a grouting steel perforated pipe with an angle steel barb into the hole, and adopting cement-water glass double-liquid grouting to form a cement-water glass-undisturbed soil composite soil body, wherein the composite soil body forms an isolation wall; c. and pouring concrete in the grooves, constructing a ground beam, and connecting the grouting steel perforated pipes into a whole. The invention has simple and controllable construction process, low cost and short construction period, effectively isolates the soil pressure generated during the construction near the existing building/structure, ensures the stability and the safety of the existing building/structure, and belongs to the field of building construction.
Description
Technical Field
The invention relates to the field of building construction, in particular to a grouting isolation wall for protecting an existing building/structure foundation.
Background
The soil around the foundation moves due to the construction of adjacent projects, and the moving soil (soil pressure thereof) acts on the foundation of the existing building/structure, which may cause the existing building/structure to displace.
Some buildings/structures are particularly sensitive to displacement of nearby soil bodies, for example, foundations of high-speed rails are particularly sensitive to displacement, the high-speed rails are fast in speed, the requirement on smoothness of rails is high, and construction near the high-speed rails can have great influence on running safety of the high-speed rails. High-speed railway functioning speed is very fast, receives the effect of side direction soil pressure to produce the displacement when the pile foundation, and then leads to the pier to produce the displacement, finally makes high-speed railway bridge orbit produce and warp, and such deformation surpasss 2mm will exert an influence to driving safety and driving travelling comfort.
Therefore, in order to ensure the safety and normal operation of the existing building/structure and to improve the safety of the adjacent engineering construction, grouting isolation wall construction is performed before the construction near the existing building/structure foundation.
The existing building/structure isolation wall mainly comprises a cast-in-situ bored pile and a post-grouting isolation wall, needs large-scale mechanical construction, and inevitably disturbs a soil body in the drilling process, so that the cost is high and the construction period is long. The isolation wall with the structure has the advantages that isolation piles arranged in rows in construction are arranged, the isolation piles form an isolation wall structure, the construction process is complex due to the fact that a plurality of isolation piles are constructed, effective connection is not needed among the isolation piles, all the isolation piles can not bear force together, soil bodies can not be consolidated to form the continuous isolation wall, and the effect of the isolation wall is affected.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention aims to: the grouting isolation wall for protecting the existing building/structure foundation is simple in construction process, short in construction period and good in isolation effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a grouting insulation wall for protecting an existing building/structure foundation, prepared by the steps of: a. digging a groove on the outer side of the existing building/structure foundation, and drilling a hole in the groove by using a down-the-hole drill; b. inserting a grouting steel perforated pipe with an angle steel barb into the hole, and adopting cement-water glass double-liquid grouting to form a cement-water glass-undisturbed soil composite soil body, wherein the composite soil body forms an isolation wall; c. and pouring concrete in the grooves, constructing a ground beam, and connecting the grouting steel perforated pipes into a whole.
Preferably, in step a, two rows of holes are arranged, the two rows of holes are arranged in a staggered manner, and the holes are arranged in a quincunx manner.
Preferably, the width of the groove is 833mm, the depth of the groove is 500mm, and the distance from the inner side of the groove to the outer side line of the existing building/structure foundation is 500 mm; the diameter of a drill bit of the down-the-hole drill is 160mm, the distance between one row of hole sites on the inner side of the down-the-hole drill during drilling is 700mm from the outer side line of the foundation of the existing building/structure, the distance between two rows of hole sites is 433mm, the two rows of hole sites are arranged in a quincunx staggered manner, the distance between two adjacent holes of the same row of holes is 500mm, and the distance between one hole and the nearest hole of the adjacent row of holes is 500 mm.
Preferably, in the step b, the grouted steel flower tube comprises a tube body, a pointed conical head and a plurality of angle steel barbs; the head is positioned at the lower end of the pipe body, a plurality of eyelets are arranged on the pipe body, and an angle steel barb welded on the outer wall of the pipe body is arranged on the outer side of each eyelet; the eyelets are spirally arranged on the pipe body at 90 degrees, two eyelets are arranged on the same cross section of the pipe body, and the two eyelets are positioned on the same diameter; in the barb of the angle steel, the right-angle side of the angle steel inclines from the inner lower part to the outer upper part.
Preferably, the length of the pipe body is 8m, the outer diameter is 114mm, and the wall thickness is 5 mm; the length of the head is 20 cm; the inner diameter of each eyelet is 8mm, and the axial distance between adjacent eyelets in the axial direction is 30 cm; the specification of the angle steel is L30 multiplied by 3, and the included angle between the axis of the angle steel and the axis of the pipe body is 30 degrees; the length of the outside of the soil body outside the grouting steel perforated pipe is 300mm, and no eyelet is arranged in the range of 50cm at the upper end of the pipe body.
Preferably, in the grouting liquid in the step b, the volume ratio of cement to water glass is 1:0.5, the grouting water cement ratio is 0.55:1, and the cement is 42.5R ordinary portland cement.
Preferably, the grouting liquid is stirred by a mortar stirrer, the concentration of the water glass is 35-42 Be, the modulus is 2.3-3.0, and the pressure of the double-liquid grouting is 0.5-1.0 MPa.
Preferably, in step b, the cement-water glass grout is poured from the bottom of the hole to the top, the drilled earth is taken out of the hole by the buoyancy of the cement-water glass grout, the color of the grout flowing out of the hole is observed during grouting, and when the grout flowing out is the cement-water glass grout, the grouting is stopped.
Preferably, firstly, a row of grouting steel perforated pipes on the outer side are grouted; and in the pressure injection, the same row of grouting steel perforated pipes are filled by adopting separated holes, and then the middle holes are filled one by one, so that a curtain is formed. The filling of the separation holes can avoid adverse effects on the filling quality of adjacent grouting steel perforated pipes when the grouting steel perforated pipes are constructed.
Preferably, in the step b, the concrete numerical value of the grouting pressure is determined through a field test, so that the cement-water glass double-liquid slurry can be ensured to fully permeate into the soil body, and a cement-water glass-undisturbed soil composite soil body is formed; grouting pressure is obtained by looking at a pressure gauge of grouting equipment.
The principle of the invention is as follows:
the construction of a grouting isolation wall is carried out before the construction near the foundation of the existing building/structure, the soil body near the existing building/structure is grouted and reinforced, the soil body near the foundation of the existing building/structure is consolidated into a cement-water glass-undisturbed soil composite soil body, then a ground beam is constructed to wrap the end of a grouting steel floral tube so that the grouting steel floral tube bears the force together, and in the grouting consolidation process, the composite soil bodies are mutually fused to form the isolation wall integrally, so that the stratum is stabilized, the movement of the soil body around the existing building/structure during the construction of the adjacent engineering is limited, the deformation of the foundation is reduced, and the stability and the safety of the existing building/structure are ensured.
In summary, the present invention has the following advantages:
1. the invention adopts the mode that the down-the-hole drill is used for leading holes, the grouting steel perforated pipe is constructed, the cement-water glass double-liquid grouting is combined with the original soil body to form the isolation wall, and the integral stress of the grouting steel perforated pipe is ensured by the construction ground beam.
2. The slip casting steel floral tube adopts the barb structure, can improve the anchor power of slip casting steel floral tube and soil body, and the barb outside the eyelet enables the thick liquid to flow from barb top and below simultaneously, makes thick liquid and soil body fully fuse simultaneously.
3. And a hole isolation filling method is adopted, so that the middle hole cannot be leaked outwards during deep grouting. The filling of the separation holes can avoid adverse effects on the filling quality of adjacent grouting steel perforated pipes when the grouting steel perforated pipes are constructed.
4. The cement-water glass double-liquid grouting can reinforce a soft stratum and limit the displacement of a soil body, has high condensation speed, and can be quickly solidified particularly in karst geology or a water-rich soil layer, so that the reinforcing effect is achieved. The cement-water glass double-liquid grouting can also play a good water stopping role in a crack development zone.
5. The construction ground beam wraps the upper end of the grouting steel perforated pipe, the grouting steel perforated pipe is connected into a whole to bear force jointly, the ground beam and the grouting steel perforated pipe act jointly, although isolation piles are not adopted, the effect of the construction ground beam is equivalent to that of the isolation piles.
Drawings
Fig. 1 is a perspective view of a slip-casting steel floral tube.
Fig. 2 is a schematic view of a top view of a slip-casting steel floral tube.
Fig. 3 is a partially enlarged view of the grouting steel floral tube.
Figure 4 is a schematic plan view of the arrangement of the grouting insulation walls and the existing building/structure foundation.
Fig. 5 is an elevation view of a grout isolation wall and existing building/structure foundation layout.
In the figure, 1 is a head, 2 is an angle iron barb, 3 is a pipe body, 4 is an eyelet, 5 is an existing building/structure foundation, 6 is a ground beam, 7 is a hole, and 8 is a grouting steel floral tube.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
A grouting insulation wall for protecting an existing building/structure foundation, prepared by the steps of: a. digging a groove on the outer side of the existing building/structure, and drilling a hole in the groove by using a down-the-hole drill; b. inserting a grouting steel perforated pipe with an angle steel barb into the hole, and adopting cement-water glass double-liquid grouting to form a cement-water glass-undisturbed soil composite soil body, wherein the composite soil body forms an isolation wall; c. and pouring concrete in the grooves, constructing a ground beam, and connecting the grouting steel perforated pipes into a whole. The method comprises the following specific steps:
(1) step a:
during large-scale construction near an existing building/structure, in order to reduce disturbance of a construction process to an existing building/structure foundation, a groove is firstly dug between the existing building/structure and a part to be constructed, in the embodiment, the width 833mm and the depth 500mm of the groove are firstly dug, the inner side of the groove is 500mm away from the side line of the existing building/structure foundation, a down-the-hole drill is adopted to drill two rows of holes in the groove along the existing building/structure foundation, in the embodiment, the diameter of a drill bit of the down-the-hole drill is 160mm, a row of hole sites (taking the axis of the hole as a reference) on the inner side during drilling are 700mm away from the outer side line of the existing building/structure foundation, the row distance of two rows of holes is 433mm, the distance between two adjacent holes on the same row is 500mm, the distance between one hole and the nearest hole on the adjacent row is 500mm, the two rows of holes are arranged in a staggered mode, and are arranged in a quincunx shape, as shown in fig. 4.
(2) Step b:
and inserting the grouting steel perforated pipe into the hole, wherein the exposed length of the grouting steel perforated pipe is 30 cm. The pipe body of the grouting steel perforated pipe is made of a national standard seamless steel pipe with the length of 8m, the outer diameter of 114mm and the wall thickness of 5 mm. The head of the front end of the grouting steel perforated pipe is processed into a pointed cone, and the length of the pointed cone is 20 cm. Holes are drilled on the pipe wall of the pipe body in a staggered mode every 30cm, and the diameter of each hole is 8 mm. The eyelets are arranged in a 90-degree spiral mode, only 2 eyelets are arranged on the same cross section, and the distance between grouting eyelets along the axial line is 30 cm. Set up the angle steel barb in the eyelet outside, the angle steel specification is L30 x 3, and the axis of angle steel is 30 with the axis contained angle of body, and the edge welding of angle steel is at the outer wall of body. No hole is drilled within 50cm of the upper end of the pipe body.
The grouting adopts cement-water glass double-liquid grouting, the volume ratio of cement to water glass is 1:0.5, the grouting water cement ratio is 0.55:1, the cement adopts 42.5R ordinary portland cement, the concentration of the water glass is 35-42 Be, the modulus is 2.3-3.0, and the grouting pressure is 0.5 MPa-1.0 MPa. The grouting pressure needs to be determined by a field test to obtain a specific numerical value, so that the cement-water glass double-liquid slurry can be ensured to fully permeate into the soil body, and a cement-water glass-undisturbed soil composite soil body is formed. Grouting pressure is obtained by looking at a pressure gauge of grouting equipment. And (3) pouring cement-water glass slurry from the bottom of the hole upwards, taking the drilled slag out of the hole by utilizing the buoyancy of the cement-water glass slurry, and stopping grouting when the slurry flowing out of the hole is the cement-water glass slurry. The grouting sequence is from outside to inside, and the jumping-hole construction is adopted at the same time, and the grouting is carried out in the single hole from bottom to top.
The concrete order of grouting is as follows:
firstly, grouting a row of grouting steel perforated pipes on the outer side; in the pressure injection, the same row of grouting steel perforated pipes are filled in separated holes, namely, the middle holes are filled after one grouting is performed, so that a curtain is formed, and the middle holes cannot seep outwards when grouting is performed deeply. If the grouting pressure is not improved all the time and the phenomenon of slurry overflow does not occur, the situation that cracks under the grouting steel floral tube develop or soil is loose and even a karst cave possibly exists is shown, at the moment, the middle part of the grouting steel floral tube is constructed as before, piles are added on the outer side for grouting, and the two ends are appropriately encrypted. During grouting, a small amount of grouting is performed on two sides for multiple times once, holes are swept for multiple times until the final hole is formed, a small amount of grouting is performed at the beginning, if underground water is found to be developed, grouting is difficult to complete, the amount of doped water glass is added according to a test, and after grouting is stable, continuous grouting is performed until two rows of holes are completely completed, namely, the principle of few holes at first and many holes at last is followed. During the fore-and-mid-term grouting, thick grout is adopted, and after the grouting pressure rises, thinner grout is gradually used for grouting. When the grouting pressure reaches the final pressure and exceeds 20 minutes, the grouting can be finished when the grout is still not blown out from the orifice. After grouting, plugging the pipe orifice: preventing the slurry from flowing back to the outside of the pipe.
(3) Step c:
and pouring concrete in the grooves, constructing a ground beam, and connecting the grouting steel perforated pipes into a whole. The thickness of the ground beam is 500mm, the width thereof is 833mm, the ground beam wraps the exposed 30cm of the tail end of the grouting steel perforated pipe, the reinforced concrete ground beam template is originally designed to adopt a shaping combined steel template, and C30 cast-in-situ commercial concrete. And (3) pouring the concrete in layers, wherein the thickness of each layer is 30-40 cm, and vibrating for 10-30 s by using an inserted vibrator in a quincunx shape until the surface of the concrete has laitance, does not sink and does not have bubbles. Pouring of concrete needs to be completed at one time, watering maintenance is carried out after pouring is completed, and the maintenance time is not less than 14 d. After initial setting, covering maintenance was started, and after final setting, watering (after 12 hours) and covering maintenance were performed.
The invention has convenient construction and obvious horizontal force isolation effect. When the existing building/structure is constructed at a position adjacent to the existing building/structure, a grouting isolation wall is constructed near the existing building/structure, so that the horizontal force generated to the existing building/structure during large-scale construction near the existing building/structure can be effectively isolated, and when the existing building/structure is constructed near the existing building/structure, the vibration to the soil layer in the excavation process can be reduced, so that the risk of soil body collapse in the excavation process is reduced.
Besides the modes mentioned in the above embodiments, the sizes of the grooves and the grouting steel perforated pipes can be adjusted according to actual conditions, and the number and the size of the drilled holes can also be adjusted according to actual conditions. These variations are all within the scope of the present invention.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A grouting insulation wall for protecting an existing building/structure foundation, characterized in that: is prepared by the following steps:
a. digging a groove on the outer side of the existing building/structure foundation, and drilling a hole in the groove by using a down-the-hole drill;
b. inserting a grouting steel perforated pipe with an angle steel barb into the hole, and adopting cement-water glass double-liquid grouting to form a cement-water glass-undisturbed soil composite soil body, wherein the composite soil body forms an isolation wall;
c. and pouring concrete in the grooves, constructing a ground beam, and connecting the grouting steel perforated pipes into a whole.
2. A grouting insulation wall for protecting the foundation of an existing building/structure according to claim 1, characterised in that: in the step a, two rows of holes are arranged, the two rows of holes are arranged in a staggered mode, and the holes are arranged in a quincunx mode.
3. A grouting insulation wall for protecting the foundation of an existing building/structure according to claim 2, characterised in that: the width of the groove is 833mm, the depth of the groove is 500mm, and the distance from the inner side of the groove to the outer side line of the existing building/structure foundation is 500 mm; the diameter of a drill bit of the down-the-hole drill is 160mm, the distance between one row of hole sites on the inner side of the down-the-hole drill during drilling is 700mm from the outer side line of the foundation of the existing building/structure, the distance between two rows of holes is 433mm, the two rows of holes are arranged in a quincunx staggered mode, and the distance between two adjacent holes in the same row of holes is 500 mm.
4. A grouting insulation wall for protecting the foundation of an existing building/structure according to claim 1, characterised in that: in the step b, the grouting steel pattern pipe comprises a pipe body, a pointed conical head and a plurality of angle steel barbs; the head is positioned at the lower end of the pipe body, a plurality of eyelets are arranged on the pipe body, and an angle steel barb welded on the outer wall of the pipe body is arranged on the outer side of each eyelet;
the eyelets are spirally arranged on the pipe body at 90 degrees, two eyelets are arranged on the same cross section of the pipe body, and the two eyelets are positioned on the same diameter;
in the barb of the angle steel, the right-angle side of the angle steel inclines from the inner lower part to the outer upper part.
5. A grouting insulation wall for protecting the foundation of an existing building/structure according to claim 4, characterised in that: the length of the pipe body is 8m, the outer diameter is 114mm, and the wall thickness is 5 mm; the length of the head is 20 cm; the inner diameter of each eyelet is 8mm, and the axial distance between adjacent eyelets in the axial direction is 30 cm; the specification of the angle steel is L30 multiplied by 3, and the included angle between the axis of the angle steel and the axis of the pipe body is 30 degrees; the length of the outside of the soil body outside the grouting steel perforated pipe is 300mm, and no eyelet is arranged in the range of 50cm at the upper end of the pipe body.
6. A grouting insulation wall for protecting the foundation of an existing building/structure according to claim 1, characterised in that: in the grouting liquid in the step b, the volume ratio of cement to water glass is 1:0.5, the grouting water cement ratio is 0.55:1, and the cement is 42.5R ordinary portland cement.
7. A grouting insulation wall for protecting an existing building/structure foundation as claimed in claim 6, wherein: the grouting liquid is stirred by a mortar stirrer, the concentration of water glass is 35-42 Be, the modulus is 2.3-3.0, and the pressure of double-liquid grouting is 0.5-1.0 MPa.
8. A grouting insulation wall for protecting the foundation of an existing building/structure according to claim 2, characterised in that: and b, pouring cement-water glass slurry upwards from the bottom of the hole, taking the drilled slag soil out of the hole by utilizing the buoyancy of the cement-water glass slurry, observing the color of the slurry flowing out of the hole during grouting, and stopping grouting when the flowing slurry is the cement-water glass slurry.
9. A grouting insulation wall for protecting an existing building/structure foundation as claimed in claim 8, wherein: firstly, grouting a row of grouting steel perforated pipes on the outer side; in the pressure injection, the steel perforated pipes are injected through separated holes in the same row of injection, and then the middle holes are injected after the steel perforated pipes are injected one by one.
10. A grouting insulation wall for protecting the foundation of an existing building/structure according to claim 1, characterised in that: in the step b, the concrete numerical value of the grouting pressure is determined through a field test, so that the cement-water glass double-liquid slurry can be ensured to fully permeate into a soil body, and a cement-water glass-undisturbed soil composite soil body is formed; grouting pressure is obtained by looking at a pressure gauge of grouting equipment.
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| CN108677924A (en) * | 2018-07-13 | 2018-10-19 | 武汉市市政建设集团有限公司 | Double miniature steel pipe pile slip casting is at wall partition-type structures and method |
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