CN108468336B - Grouting machine for site protection and construction method - Google Patents
Grouting machine for site protection and construction method Download PDFInfo
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- CN108468336B CN108468336B CN201810339731.7A CN201810339731A CN108468336B CN 108468336 B CN108468336 B CN 108468336B CN 201810339731 A CN201810339731 A CN 201810339731A CN 108468336 B CN108468336 B CN 108468336B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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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- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a grouting machine for site protection and a construction method. The upper piston is externally connected with hydraulic equipment and internally connected with a hydraulic liner, the upper spherical hinge is hollow and is connected with a grouting port, and the upper spherical hinge and the upper linkage rod are hollow and are communicated with the nozzle; placing the grouting machine in a contracted state into the center position of an inner hole of the pile with the hole after pile sinking, adjusting the main pipe to a set position, and enabling the upper piston to relatively move along the main pipe; the hydraulic liner is regulated to be in a negative pressure state, and the upper piston moves downwards to drive the upper and lower linkage rods to expand; the nozzle is hinged between the upper linkage rod and the lower linkage rod and expands along with the upper linkage rod, so that the side wall of the pipe pile is penetrated by geotextile, pressure grouting is carried out at each grouting opening, and grouting liquid is injected into the soil at the periphery side through the upper spherical hinge, the upper linkage rod and the nozzle. The invention can prevent the collapse of the side wall of the site foundation pit and the slip crack surface at the bottom of the foundation pit from affecting the safety of the mining site, can be placed in the open tubular pile in site mining, and can be used for grouting and reinforcing site soil through the side wall hole of the tubular pile, and can be recycled.
Description
Technical Field
The invention relates to a device and a method for site protection, in particular to a grouting machine for site protection and a construction method.
Background
The full-period protection of the soil remains in the southeast coastal humid environment is always a troublesome problem to be researched urgently, the phenomenon of collapse of the side wall of the soil layer is convenient to observe due to the fact that the side wall of the foundation pit in the remains digging area is required to be erected and is difficult to prevent rainwater invasion in rainy seasons during and after the remains are dug.
Disclosure of Invention
In order to solve the problems in the background art, based on the consideration of protecting cultural relics in an unexplored site area and reinforcing the peripheral wall of a site foundation pit, the invention provides a grouting machine for site protection and a construction method, which can be repeatedly used, the tubular pile with holes plays a role in supporting and retaining in the excavation, and grouting equipment can improve the physical and chemical properties of site soil so as to achieve the reinforcing effect.
The technical scheme adopted by the invention is as follows:
1. a grouting machine for site protection:
the grouting machine comprises a main pipe, an upper piston, a lower piston, a guide post and a hinging assembly, wherein the lower piston is fixed at the top end of the main pipe, the upper piston is arranged above the lower piston, a through hole is formed in the center of the upper piston, the through hole is connected with hydraulic equipment, and a hydraulic liner is connected between the upper piston and the lower piston; the hydraulic inner container is of an expandable and contractible structure, and the lower piston is fixed on the main pipe, so that the upper piston is driven to move up and down along the guide post by expansion and contraction of the hydraulic inner container, and further the hinge assembly is driven to bend;
a plurality of guide posts and a plurality of hinge assemblies are arranged between the upper piston and the lower piston, the number of the guide posts is the same as that of the hinge assemblies, and the hinge assemblies are arranged on the guide posts; the hinging assembly comprises an upper spherical hinge, a lower spherical hinge, an upper linkage pipe, a lower linkage pipe and a middle spherical hinge, wherein the top end of the upper linkage pipe is hinged with the edge of the upper piston through the upper spherical hinge, the bottom end of the upper linkage pipe is hinged with the lower linkage pipe through the middle spherical hinge, and the lower linkage pipe is hinged with the edge of the lower piston through the lower spherical hinge; the upper spherical hinge, the upper linkage pipe and the middle spherical hinge are hollow structures and are communicated, the upper spherical hinge is provided with a grouting opening, the middle spherical hinge is provided with a nozzle, and slurry enters the upper spherical hinge through the grouting opening, then enters the middle spherical hinge through the upper linkage pipe and finally is sprayed out from the nozzle.
The tubular pile with holes for the site protection has smaller size, the general radial size is 400-600mm, and the common grouting machine is larger and cannot be suitable for the tubular pile with holes in the site protection. The radial dimension of the grouting machine structure can reach within 400mm, and the grouting machine structure can be suitable for the tubular pile with the holes in the site protection.
The grouting machine is arranged in the tubular pile with the holes for site protection.
The tubular pile with the holes is provided with a pile side wall hole, and geotextile is sleeved outside the tubular pile.
The guide posts and the hinge assemblies are uniformly distributed between the upper piston and the lower piston along the circumferential direction.
The bottom ends of the guide posts are fixed on the top end of the main pipe and positioned at the periphery of the upper piston and the lower piston.
The guide post is provided with a vertical strip-shaped groove, and the upper spherical hinge is connected with the strip-shaped groove in an embedded mode, so that the upper spherical hinge moves along the strip-shaped groove.
The nozzle is hinged between the upper linkage pipe and the lower linkage pipe, the adjacent pipe piles with holes are respectively connected with the cathode and the anode, and grouting is carried out by adopting an electroosmosis method.
The grouting material is a gel material which is commonly used in the protection of earthen sites and verified by silicate, acrylic acid, organic silicon and the like.
2. A grouting construction method for site protection is carried out by adopting the following steps:
step one: placing the grouting machine in a contracted state into the center of an inner hole of the pile-sinking perforated pipe, lifting and moving an adjusting main pipe to the bottommost part just facing to the pile side wall hole of the bottommost part of the pile of the perforated pipe so as to perform grouting;
step two: the hydraulic equipment is controlled to enable the hydraulic liner to shrink in a negative pressure state, the lower piston is fixed, the upper piston moves downwards, the distance between the upper piston and the lower piston is driven to be shortened, the upper piston and the lower piston are close, and the middle spherical hinge between the upper linkage pipe and the lower linkage pipe is driven to move outwards along the radial direction; the nozzle at the middle spherical hinge extends out of the pile side wall hole of the tubular pile with holes to pierce the geotextile of the tubular pile jacket;
step three: the slurry enters from a grouting opening of the upper spherical hinge, and is sprayed out from a nozzle of the middle spherical hinge to perform pressure grouting;
step four: after grouting is finished, controlling the hydraulic equipment to increase the pressure in the hydraulic liner, fixing the lower piston, and driving the upper piston to move upwards to increase the distance between the upper piston and the lower piston so as to separate the upper piston from the lower piston;
step five: and the mobile main pipe ascends, and grouting is carried out on pile side wall holes at all the heights above the bottommost part of the pipe pile with holes in the second to fourth pairs of steps until grouting is completed on all the pile side wall holes.
Step six: and taking out the grouting machine from the tubular pile with the holes, recycling the site soil, and backfilling the site soil into the tubular pile with the holes.
According to the invention, after the water and the slope of the site foundation pit are lowered, the tubular pile with the holes on the side wall of the lower part is implanted into the periphery of a site excavation area, a grouting machine in a contracted state is placed in the center position of an inner hole of the tubular pile, a main pipe is adjusted to a set position, the hydraulic equipment is depressurized to enable the upper and lower linkage pipes of the grouting machine to be expanded, nozzles pierce geotextiles outside the tubular pile, grouting is carried out layer by layer on the side wall holes of the tubular pile, the grouting machine is recovered after grouting is finished, and the improved site soil is backfilled, so that the effect of reinforcing the site excavation side wall is achieved.
The structural dimensional relation of the grouting machine is as follows:
maximum shrinkage state range L of grouting machine 1 ：
Maximum range L of grouting machine expansion state 2 ：
Distance h from central axis of tubular pile side wall hole to bottom Hole(s) ：
Diameter phi of the tubular pile side wall opening:
wherein D is the outer diameter of the pipe pile, D is the inner diameter of the pipe pile, L1 is the maximum range of the shrinkage state of the grouting machine, L2 is the maximum range of the expansion state of the grouting machine, R is the radius of the main pipe of the grouting machine, h0 is the distance from the main pipe to the bottom, h1 is the distance between the upper piston and the lower piston, and when the grouting machine is in the shrinkage state, the included angle theta of the upper and lower linkage pipes is the same as the included angle theta 1 Grouting machine expansionIn the state, the included angle theta of the upper and lower linkage pipes 2 L is the length of the upper and lower linkage pipes, delta is the thickness of the upper and lower pistons, phi is the diameter of the hole on the side wall of the tubular pile, and r 0 Is the radius of the nozzle.
The beneficial effects of the invention are as follows:
when the pit around the site is lowered and inclined before the site is excavated, the perforated pipe piles and other building enclosures form an internal supporting building enclosure to support, so that collapse of the side wall of the site pit and the influence of a sliding crack surface on the bottom of the pit on the site safety of the excavation can be prevented; in the site excavation, the grouting machine can be placed in the hole-opened tubular pile to perform grouting through the side wall hole of the tubular pile to reinforce site soil, and the grouting machine can realize cyclic utilization.
Drawings
FIG. 1 is a vertical sectional view of a grouting machine in a contracted state;
FIG. 2 is a top view of the grouting machine in a contracted state;
FIG. 3 is a vertical sectional view of the grouting machine in an expanded state;
FIG. 4 is a top view of the grouting machine in an expanded state;
FIG. 5 is a cross-sectional view of the grouting machine in an expanded state 1-1;
FIG. 6 is a diagram of a satellite at a site in Zhejiang province;
FIG. 7 is a layout of a pile and grouting machine in a certain ruined site of Zhejiang province;
FIG. 8 is a cross-sectional view of a class A pile in certain remains of Zhejiang province;
fig. 9 is a sectional view of a class B pile in certain ruins of Zhejiang province.
In the figure: 1: a grouting port; 2: a hydraulic device; 3, an upper piston; 4: a hydraulic liner; 5: a spherical hinge is arranged; 6: an upper linkage tube; 7: a middle spherical hinge; 8: a lower linkage tube; 9: a lower spherical hinge; 10: a lower piston; 11: a main pipe; 12: a guide post; 13: a tubular pile with holes; 14: geotextile; 15: pile sidewall holes; 16: a grouting machine; 17: and a vacuum pumping device.
D is the outer diameter of the pipe pile; d is the inner diameter of the tubular pile; l (L) 1 The maximum shrinkage state range of the grouting machine; l (L) 2 Maximum extension state range of grouting machine; the radius of the main pipe of the R grouting machine; h is a 0 The distance from the main pipe to the bottom; h is a 1 The distance between the upper piston and the lower piston; when the grouting machine is in a contracted state,included angle theta of upper and lower linkage pipes 1 The method comprises the steps of carrying out a first treatment on the surface of the When the grouting machine is in an expanded state, the included angle theta of the upper and lower linkage pipes 2 The method comprises the steps of carrying out a first treatment on the surface of the L is the length of the upper and lower linkage pipes; delta is the thickness of the upper piston and the lower piston; phi is the diameter of the hole on the side wall of the tubular pile, r 0 Radius r of nozzle/middle spherical hinge 1 Radius r of upper spherical hinge 2 Radius d of grouting port 0 Is the thickness of the upper and lower linkage tubes.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1, the concrete implementation of the invention comprises a main pipe 11, an upper piston 3, a lower piston 10, a guide post 12 and a hinging assembly, wherein the lower piston 10 is fixed at the top end of the main pipe 11, the upper piston 3 is arranged above the lower piston 10, a through hole is formed in the center of the upper piston 3 and is connected with a hydraulic device 2, and a hydraulic liner 4 is connected between the upper piston 3 and the lower piston 10; a plurality of guide posts 12 and a plurality of hinge assemblies are arranged between the upper piston 3 and the lower piston 10, the number of the guide posts 12 is the same as that of the hinge assemblies, and the hinge assemblies are arranged on the guide posts 12. The guide post 12 is provided with a vertical strip-shaped groove, and the upper spherical hinge 5 is connected with the strip-shaped groove in an embedded manner, so that the upper spherical hinge 5 moves along the strip-shaped groove.
The grouting machine 16 is arranged in the tubular pile 13 with holes for site protection, the tubular pile 13 with holes 15 on the side wall of the pile is a tubular pile, and the geotextile 14 is sleeved outside the tubular pile.
The guide posts 12 and the hinge assemblies are uniformly distributed between the upper piston 3 and the lower piston 10 along the circumferential direction. The bottom ends of the plurality of guide posts 12 are fixed to the top end of the main pipe 11 and located at the periphery of the upper piston 3 and the lower piston 10. The main pipe 11 is driven by external equipment to vertically move up and down, and the main pipe 11 can be positioned at any height and is fixed.
As shown in fig. 1-3, the hinging assembly comprises an upper spherical hinge 5, a lower spherical hinge 9, an upper linkage pipe 6, a lower linkage pipe 8 and a middle spherical hinge 7, wherein the top end of the upper linkage pipe 6 is hinged with the edge of the upper piston 3 through the upper spherical hinge 5, the bottom end of the upper linkage pipe 6 is hinged with the lower linkage pipe 8 through the middle spherical hinge 7, and the lower linkage pipe 8 is hinged with the edge of the lower piston 10 through the lower spherical hinge 9; the upper spherical hinge 5, the upper linkage pipe 6 and the middle spherical hinge 7 are hollow structures and are communicated, the upper spherical hinge 5 is provided with a grouting opening 1, the middle spherical hinge 7 is provided with a nozzle, and slurry enters the upper spherical hinge 5 through the grouting opening 1, enters the middle spherical hinge 7 through the upper linkage pipe 6, and finally is sprayed out from the nozzle.
The hydraulic liner 4 is of an expandable and contractible structure, and the lower piston 10 is fixed on the main pipe 11, so that the upper piston 3 is driven to move up and down along the guide post by expansion and contraction of the hydraulic liner 4, and further the hinge assembly is driven to bend.
As shown in fig. 1 and 2, when the grouting machine is in a contracted state, the external hydraulic equipment does not work, the upper piston 3 and the lower piston 10 are far apart, the upper linkage pipe 6 and the lower linkage pipe 8 are in a furled state, and the middle spherical hinge is close to the middle.
As shown in fig. 3-5, when the grouting machine is in an expanded state, external hydraulic equipment is depressurized, the upper piston 3 and the lower piston 10 are closely spaced, the upper linkage pipe 6 and the lower linkage pipe 8 are in an expanded state, and a nozzle 7 on the middle spherical hinge extends out of a pile side wall hole 15 on a pipe pile 13 with holes to puncture a geotextile 14 sleeved outside the pipe pile for pressure grouting.
The embodiment of the invention and the implementation process thereof are as follows:
step one: placing the grouting machine in a contracted state into the center position of an inner hole of the pile 13 of the pile-sinking-completed perforated pipe, lifting and moving the main adjusting pipe 11 to the position that the bottommost part is opposite to the pile side wall hole 15 of the bottommost part of the pile 13 of the perforated pipe so as to perform grouting;
step two: the hydraulic equipment 2 is controlled to enable the hydraulic liner 4 to shrink in a negative pressure state, the lower piston 10 is fixed, the upper piston 3 moves downwards, the distance between the upper piston 3 and the lower piston 10 is driven to be shortened, the upper piston 3 and the lower piston 10 are enabled to be close, and the middle spherical hinge 7 between the upper linkage pipe 6 and the lower linkage pipe 8 is driven to move outwards in the radial direction; the nozzle of the middle spherical hinge 7 extends out of the pile side wall hole 15 of the pipe pile 13 with holes to pierce the geotextile 14 of the pipe pile jacket;
step three: the slurry enters from the grouting opening 1 of the upper spherical hinge 5, and is sprayed out from the nozzle of the middle spherical hinge 7 to perform pressure grouting;
step four: after grouting is finished, the hydraulic equipment 2 is controlled to increase the pressure in the hydraulic liner 4, the lower piston 10 is fixed, the upper piston 3 moves upwards, and the distance between the upper piston 3 and the lower piston 10 is increased to separate the upper piston 3 from the lower piston 10;
step five: and the mobile main pipe 11 ascends, and grouting is carried out on pile side wall holes 15 at all the heights above the bottommost part of the pipe pile 13 with holes in the second to fourth pairs of steps until grouting is completed on all the pile side wall holes 15.
Step six: and taking out the grouting machine from the perforated tubular pile 13, recycling, and backfilling site soil into the perforated tubular pile 13.
The concrete embodiment conditions of the grouting machine and the grouting construction mode are adopted:
the coastal site of the east of Zhejiang province has been surveyed for the extent of the site, i.e. the black frame position in fig. 6.
In the concrete implementation, if continuous precipitation is needed in the excavation process of the foundation pit, after the foundation pit of the site is inclined, the tubular pile with the holes on the side wall of the lower part is implanted into the periphery of the excavation area of the site. In the embodiment, 20 lower open-pore pipe piles are arranged along the side wall of the site foundation pit, the arrangement diagram is shown in fig. 7, and all the pipe piles have the same structure. In FIG. 7, piles #1 to #20 are seen, wherein piles #1 to #19 are hereinafter referred to as class A piles, piles #2 to #20 are hereinafter referred to as class B piles, pile pipe piles of class A are used as drainage channels, pile pipe piles of class B are used as grouting channels, and pile pipe piles of class B are matched with a grouting machine to play a role in grouting reinforcement.
In the process of releasing slope and lowering water of the site foundation pit, all the tubular piles and other building enclosures form an internal support type building enclosure for supporting, so that collapse of the side wall of the site foundation pit and the influence of a slip crack surface on the bottom of the foundation pit on the safety of a mining site can be prevented. In the site excavation, a negative electrode is inserted into a pile pipe of the class A, a vacuum pumping device 17 is connected to the pile pipe for electroosmosis pumping and draining, and a pile of the class B is subjected to grouting by using the grouting machine 16 and the grouting construction mode, and a positive electrode is connected to a nozzle of the grouting machine.
As shown in FIG. 8, the section view of the A-type pile site is shown, the A-type perforated tubular pile 13 serves as the inner side wall of the site for site excavation, and the pile top is connected with the vacuum pumping device 17, so that the site water level can be controlled rapidly.
The section view of the class B pile site is shown in fig. 9, except for supporting and enclosing effects, a single pile grouting area is a shadow part in the drawing, and the strength of soil body on the side wall of the site is obviously improved after grouting.
After the site is excavated, half of the class A piles are removed for recovery, and the reserved half of the class A piles can continuously play a role in controlling the water level, and class B piles backfill site soil to serve as reinforcing bars of walls to stabilize site side walls. All grouting piles and other internal supporting type enclosure structures can be removed, and recycling is achieved.
The advantages are that: 1. the rigid support requirement in the site excavation process is met; 2. the requirement of rapid precipitation in the high water level site mining process is met; 3. grouting improves the strength of the site side wall; 4. the left drainage channel solves the problem of site diseases caused by subsequent water level fluctuation of the discovered site.
In the embodiment, the site mining area is in a rectangular range of 12m multiplied by 10m, two gentle slopes are placed from outside to inside in the site mining process, the final depth of inner precipitation is 11.50 meters, the depth of outer water level is 0.682 meter, and the parameters of site soil layers are set as shown in the following table 1:
TABLE 1
The hill drop information is as follows in table 2:
TABLE 2
| Slope number | Table width (m) | Slope (m) | Gradient coefficient |
| 1 | 4.000 | 2.000 | 1.500 |
| 2 | 2.000 | 2.500 | 3.000 |
The section parameter of the tubular pile with holes is 600mm in outer diameter D, 500mm in inner diameter D and 14 m in length, the side wall of the tubular pile is vertically perforated at the position of the tail end 4m at intervals of 1m, and the diameter phi of the side wall hole is 20mm; the perforated tubular piles are made of section steel Q345, and the pile spacing is arranged every 2 m.
The grouting machine 16 of the embodiment has a main pipe radius R of 106mm, an upper and lower linkage rod length L of 188mm and a maximum contraction state range L 1 300mm, expanded state L 2 610mm, nozzle radius r 0 10mm, and the included angle theta of the upper and lower linkage rods when the grouting machine is in a contracted state 1 160 °; when the grouting machine is in an expanded state, the included angle theta of the upper and lower linkage rods 2 Is 10 deg..
The internal force values are shown in Table 3 below:
TABLE 3 Table 3
Through calculation, the tubular pile with the holes plays an obvious role in supporting and retaining in the excavation process, and the grouting equipment can improve the physical and chemical properties of site soil and increase the cohesiveness of soil particles so as to achieve the optimization of the overall reinforcement performance.
Claims (8)
1. A slip casting machine for site protection, its characterized in that: the hydraulic device comprises a main pipe (11), an upper piston (3), a lower piston (10), a guide post (12) and a hinging assembly, wherein the lower piston (10) is fixed at the top end of the main pipe (11), the upper piston (3) is arranged above the lower piston (10), a through hole is formed in the center of the upper piston (3), the through hole is connected with a hydraulic device (2), and a hydraulic liner (4) is connected between the upper piston (3) and the lower piston (10); the hydraulic inner container (4) is of an expandable and contractible structure, and the lower piston (10) is fixed on the main pipe (11), so that the upper piston (3) is driven to move up and down along the guide post by expansion and contraction of the hydraulic inner container (4), and further the hinge assembly is driven to bend;
a plurality of guide posts (12) and a plurality of hinge assemblies are arranged between the upper piston (3) and the lower piston (10), the number of the guide posts (12) is the same as that of the hinge assemblies, and the hinge assemblies are arranged on the guide posts (12); the hinging assembly comprises an upper spherical hinge (5), a lower spherical hinge (9), an upper linkage pipe (6), a lower linkage pipe (8) and a middle spherical hinge (7), wherein the top end of the upper linkage pipe (6) is hinged with the edge of the upper piston (3) through the upper spherical hinge (5), the bottom end of the upper linkage pipe (6) is hinged with the lower linkage pipe (8) through the middle spherical hinge (7), and the lower linkage pipe (8) is hinged with the edge of the lower piston (10) through the lower spherical hinge (9); the upper spherical hinge (5), the upper linkage pipe (6) and the middle spherical hinge (7) are hollow structures and are communicated, the upper spherical hinge (5) is provided with a grouting opening (1), the middle spherical hinge (7) is provided with a nozzle, slurry enters the upper spherical hinge (5) through the grouting opening (1), enters the middle spherical hinge (7) through the upper linkage pipe (6), and finally is sprayed out from the nozzle.
2. A grouting machine for site protection as claimed in claim 1, wherein:
the grouting machine is arranged in a tubular pile (13) with holes for site protection.
3. A grouting machine for site protection as claimed in claim 2, wherein:
the tubular pile (13) with the holes is a tubular pile with holes on the side wall of the pile, and geotextile (14) is sleeved outside the tubular pile.
4. A grouting machine for site protection as claimed in claim 1, wherein:
the guide posts (12) and the hinge assemblies are uniformly distributed between the upper piston (3) and the lower piston (10) along the circumferential direction.
5. A grouting machine for site protection as claimed in claim 1, wherein:
the bottom ends of the guide posts (12) are fixed on the top end of the main pipe (11) and are positioned at the periphery of the upper piston (3) and the lower piston (10).
6. A grouting machine for site protection as claimed in claim 1, wherein:
the guide post (12) is provided with a vertical strip-shaped groove, and the upper spherical hinge (5) is connected with the strip-shaped groove in an embedded mode, so that the upper spherical hinge (5) moves along the strip-shaped groove.
7. A grouting machine for site protection as claimed in claim 1, wherein:
the nozzle is hinged between the upper linkage pipe and the lower linkage pipe, a plurality of hole pipe piles (13) are arranged on a construction site, grouting machines are arranged in the hole pipe piles (13) at intervals, the hole pipe piles (13) with grouting machines are connected with the positive electrode, and the hole pipe piles (13) without grouting machines are connected with the negative electrode.
8. A grouting construction method for site protection is characterized in that: the method comprises the following steps:
step one: placing the grouting machine according to any one of claims 1-7 into the center position of an inner hole of a pile (13) with holes after pile sinking, lifting and moving an adjusting main pipe (11) to the position that the bottommost part is opposite to a pile side wall hole (15) at the bottommost part of the pile (13) with holes so as to perform grouting;
step two: the hydraulic equipment (2) is controlled to enable the hydraulic liner (4) to shrink in a negative pressure state, the lower piston (10) is fixed, the upper piston (3) moves downwards, the distance between the upper piston (3) and the lower piston (10) is driven to be shortened, the upper piston (3) and the lower piston (10) are close, and the middle spherical hinge (7) between the upper connecting pipe (6) and the lower connecting pipe (8) is driven to move outwards in the radial direction; the nozzle at the middle spherical hinge (7) extends out of the pile side wall hole (15) of the pipe pile (13) with the hole to pierce the geotextile (14) of the pipe pile jacket;
step three: the slurry enters from a grouting opening (1) of the upper spherical hinge (5), and is sprayed out from a nozzle of the middle spherical hinge (7) for pressure grouting;
step four: after grouting is finished, controlling the hydraulic equipment (2) to increase the pressure in the hydraulic liner (4), fixing the lower piston (10), and enabling the upper piston (3) to move upwards to drive the upper and lower pistons (3, 10) to increase the distance between the upper and lower pistons (3, 10) so as to separate the upper and lower pistons (3, 10);
step five: lifting the mobile main pipe (11), and repeating the second to fourth pairs of pile side wall holes (15) at each height above the bottommost part of the pipe pile (13) with holes to perform grouting until all pile side wall holes (15) are subjected to grouting;
step six: and taking out the grouting machine from the pipe pile (13) with holes, recycling the site soil, and backfilling the site soil into the pipe pile (13) with holes.
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| CN108468336A (en) | 2018-08-31 |
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