CN112832235A - Construction method and construction device for precast pile post-grouting - Google Patents
Construction method and construction device for precast pile post-grouting Download PDFInfo
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- CN112832235A CN112832235A CN202110025125.XA CN202110025125A CN112832235A CN 112832235 A CN112832235 A CN 112832235A CN 202110025125 A CN202110025125 A CN 202110025125A CN 112832235 A CN112832235 A CN 112832235A
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- 238000010276 construction Methods 0.000 title claims abstract description 31
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- 229910000831 Steel Inorganic materials 0.000 claims description 24
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- 238000007569 slipcasting Methods 0.000 claims description 14
- 238000003466 welding Methods 0.000 claims description 12
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- 229910001294 Reinforcing steel Inorganic materials 0.000 description 5
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- 238000002955 isolation Methods 0.000 description 2
- 239000011513 prestressed concrete Substances 0.000 description 2
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- 229920000742 Cotton Polymers 0.000 description 1
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- 238000001035 drying Methods 0.000 description 1
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- 239000008399 tap water Substances 0.000 description 1
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- 239000002349 well water Substances 0.000 description 1
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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
- E02D5/50—Piles comprising both precast concrete portions and concrete portions cast in situ
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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
- 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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Abstract
The invention provides a construction method and a construction device for precast pile post-grouting, and belongs to the technical field of precast pile grouting methods and devices. The construction method comprises the steps of sinking a precast pile which is pre-embedded with a vertical grouting guide pipe and is welded with a grouting nozzle on the vertical grouting guide pipe into a required elevation; when the precast pile is stable, namely, the precast pile does not float upwards, sink and move, the grouting nozzle plug is firstly dissolved and flushed by high-pressure injection water through the vertical grouting guide pipe, then the grouting channel is opened, the plug is opened by clear water, and after the plug is opened by clear water, pile end grouting or pile side wall grouting is carried out according to the vertical grouting guide pipe pre-embedded in the precast pile, or combined grouting of the pile end and the pile side is carried out. The construction device comprises a grouting nozzle, a precast pile and a vertical grouting guide pipe, wherein the bottom end of the precast pile is connected with a pile tip, the vertical grouting guide pipe is pre-embedded in the precast pile, the vertical grouting guide pipe is welded with the grouting nozzle, and a grouting nozzle plug is inserted into the grouting nozzle before pile sinking.
Description
Technical Field
The invention relates to a construction method and a construction device for precast pile post-grouting, and belongs to the technical field of precast pile grouting methods and devices.
Background
At present, most of post-grouting technologies applied in the field of pile foundation construction are cast-in-place piles, and the post-grouting technology of the cast-in-place piles is mature and reliable. And the post-grouting technology for the precast pile is few, immature and has more defects. 1. The authorization notice number is: CN206971205U, the date of authorized announcement: 2018.02.06, entitled "post-grouting reinforced concrete pretensioned prestressed hollow pile on pile side"; 2. the authorization notice number is: CN206289627U, the date of authorized announcement: 2017.06.30, a utility model named "a post-grouting pipe pile"; 3. the invention discloses a prestressed concrete pipe pile with the application publication number of CN107794914A and the application publication date of 2018.03.13, and is named as 'a prestressed concrete pipe pile combining post-grouting and expanding technology and a manufacturing method thereof'; 4. the invention patent applications with the application publication number of CN108914925A and the application publication date of 2018.11.30 and the name of the precast pile high-pressure jet after-reaming grouting technology have the following defects: (1) the guniting port is very easy to damage in the pile sinking process. (2) When multi-point grouting or pile end and pile side combined grouting is carried out, a plurality of or more grouting pipes need to be installed, and therefore the process is too complicated and even cannot be completed when pile splicing is carried out.
Disclosure of Invention
The invention aims to solve the problems in the prior art, namely the following defects exist in the post-grouting technology applied in the field of precast pile foundation construction: (1) the guniting port is very easy to damage in the pile sinking process. (2) When multi-point grouting or combined grouting is carried out, a plurality of or more grouting pipes need to be installed, and therefore the process is too complicated and even cannot be completed when pile splicing is carried out. Further provides a construction method and a construction device for precast pile post-grouting.
The purpose of the invention is realized by the following technical scheme:
a construction method for post-grouting of a precast pile comprises the steps of firstly, sinking the precast pile which is pre-embedded with a vertical grouting guide pipe and welded with a grouting nozzle on the vertical grouting guide pipe into a required elevation.
Step two, when the precast pile is stable, namely the precast pile does not float upwards, sink and move, high-pressure injection water is injected through the vertical grouting guide pipe to dissolve and flush the grouting nozzle plug, and then a grouting channel is opened and water is removed to open the plug;
and step three, after the plug is opened by clear water, pile end grouting or pile side wall grouting is carried out according to the vertical grouting guide pipe pre-embedded in the precast pile, or combined grouting of the pile end and the pile side wall is carried out.
In the first step, a grouting nozzle plug is plugged into a grouting nozzle before the precast pile is sunk.
In the second step, the pressure of the high-pressure injection water is 0.5MPa-70 MPa.
In the third step, the grouting pressure is 1MPa-70 MPa.
The device comprises a grouting nozzle, a precast pile and a vertical grouting guide pipe, wherein the bottom end of the precast pile is connected with a pile toe, the vertical grouting guide pipe is pre-embedded in the precast pile, the grouting nozzle is welded on the vertical grouting guide pipe, and a grouting nozzle plug is inserted into the grouting nozzle before pile sinking.
A device used in a construction method of precast pile post grouting comprises a grouting spray head, two or more precast piles, a flange plate and a vertical grouting guide pipe, wherein the bottom end of the lowest precast pile is connected with a pile toe, the vertical grouting guide pipe is pre-buried in the two or more precast piles, the flange plate is arranged at the top end of the lower precast pile and welded with steel bars of the precast pile, the flange plate is arranged at the bottom end of the upper precast pile and welded with the steel bars of the precast pile, the grouting spray head is welded on the vertical grouting guide pipe in the lower precast pile, a grouting spray head plug is inserted into the grouting spray head before pile sinking, and the lower precast pile and the upper precast pile are connected through two flange plates in a welded mode.
The invention has the beneficial effects that: 1. the used materials are easy to purchase in the market or can be obtained locally; 2. the process is simple and is close to the existing grouting technology after the filling pile is filled; 3. the grouting nozzle is simple to manufacture, reliable in work and not easy to damage; 4. the pile side resistance enhancement coefficient can be improved by 1.2-3 times. The resistance coefficient of the pile end can be improved by 2.2-4 times.
Drawings
Fig. 1 is a schematic structural diagram of a grouting nozzle.
Fig. 2 is a structural schematic diagram of a grouting nozzle plug.
Fig. 3 is a structural schematic diagram of a steel guard plate and a deformed steel bar or a steel needle in the grouting nozzle plug.
Fig. 4 is a schematic structural diagram of the precast pile of embodiment 1, in which the pre-embedded vertical grouting guide pipe and the annular grouting guide pipe have the requirement of side wall grouting.
Fig. 5 is a schematic structural view of the pile end grouting requirement of the vertical grouting guide pipe embedded in the precast pile in embodiment 1.
Fig. 6 is a schematic cross-sectional view of the flange.
Fig. 7 is a schematic diagram of a precast pile section without post grouting requirement in example 2.
Fig. 8 is a schematic diagram of a precast pile section with a side wall post-grouting requirement in example 2.
Fig. 9 is a schematic view of pile end back grouting and pile side back grouting precast pile sections in the embodiment 1 and the embodiment 2.
Fig. 10 is a schematic view of a precast pile section without post grouting requirement in example 2.
Fig. 11 is a schematic view of the connection base of the flange plate and the vertical grouting duct.
Fig. 12 is a schematic view of an isolation plug.
Fig. 13 is a schematic view of a sphere.
Fig. 14 is a schematic diagram of a precast pile section with side wall post-grouting and pile end post-grouting requirements.
Fig. 15 is a schematic view of a precast pile section without grouting requirement in example 3.
Fig. 16 is a schematic view of a precast pile section with a side wall post-grouting requirement in example 3.
Fig. 17 is a schematic view of a precast pile section with pile end post-grouting requirements in example 3.
Fig. 18 is a schematic view of a precast pile section with a side wall post-grouting requirement in example 3.
In the figure, reference numerals, 1 is a grouting nozzle, 2 is a grouting nozzle plug, 3 is a precast pile, 4 is a flange, 5 is a vertical grouting guide pipe, 6 is an annular grouting guide pipe, 7 is a pile tip, 8 is a connecting base, 9 is an isolation soil block, 10 is a sphere, 21 is a steel guard plate, 22 is deformed steel or a steel needle, 23 is a clay or alkaline earth block, 41 is a reinforcement hole, 42 is an annular semicircular groove, and 43 is a grouting through hole.
The specific implementation mode is as follows:
the invention will be described in further detail below with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1 to 18, the construction method of the precast pile post-grouting according to the present embodiment includes the following steps:
step one, sinking a precast pile 3 which is pre-embedded with a vertical grouting guide pipe 5 and welded with a grouting spray head 1 on the vertical grouting guide pipe 5 into a required elevation.
And step two, after the precast pile 3 is stabilized, namely does not float upwards, does not sink and does not move, high-pressure injection water is injected through the vertical grouting guide pipe 5 to dissolve and flush the grouting nozzle plug 2, and then a grouting channel is opened and water is removed to open the plug.
And step three, after the plug is opened by clear water, pile end grouting or pile side wall grouting is carried out according to the vertical grouting guide pipe 5 pre-embedded in the precast pile 3, or combined grouting of the pile end and the pile side wall is carried out.
In the first step, a grouting nozzle plug 2 is plugged into a grouting nozzle 1 before the precast pile 3 is driven to sink the pile.
In the second step, the pressure of the high-pressure injection water is 0.5MPa-70 MPa.
In the third step, the grouting pressure is 1MPa-70 MPa.
The device used in the construction method for precast pile post-grouting comprises a grouting nozzle 1, a precast pile 3 and a vertical grouting guide pipe 5, wherein the bottom end of the precast pile 3 is connected with a pile toe 7, the vertical grouting guide pipe 5 is pre-embedded in the precast pile 3, the grouting nozzle 1 is welded on the vertical grouting guide pipe 5, and a grouting nozzle plug 2 is inserted into the grouting nozzle 1 before pile sinking.
The cross section of the precast pile 3 is in any geometric shape (regular circle, square, pentagon, hexagon, octagon, ellipse, triangle, diamond, pentagon and the like, and the precast pile 3 can be a hollow pile or a solid pile).
The device used in the construction method for the precast pile post-grouting further comprises an annular grouting guide pipe 6, wherein the annular grouting guide pipe 6 is pre-embedded in the precast pile 3 and communicated with a vertical grouting guide pipe 5, a grouting nozzle 1 is welded on the annular grouting guide pipe 6, and a grouting nozzle plug 2 is inserted into the grouting nozzle 1 before pile sinking.
One to five or one or more vertical grouting guide pipes 5 are pre-embedded in the precast pile 3, the one to five or one or more vertical grouting guide pipes 5 are uniformly distributed in the precast pile 3, and at least one grouting nozzle 1 is welded on each vertical grouting guide pipe 5. The pile end grouting nozzle 1 is welded at the bottom of the pile head and is connected with a grouting pipe. If pile end grouting needs a plurality of spray heads, a plurality of pile end grouting spray heads can be welded at the pile tip in a branching mode. The grouting nozzle 1 is welded on the annular grouting guide pipe 6 during pile side grouting.
At least one grouting nozzle 1 is welded on the annular grouting guide pipe 6. If two, three, four or more grouting nozzles 1 are uniformly distributed on the annular grouting guide pipe 6.
The technical scheme is a structure of a single-section pile.
The following technical scheme is a structure with two sections of piles.
The utility model provides a device that construction method of slip casting behind precast pile used, including slip casting shower nozzle 1, two sections precast pile 3, ring flange 4 and vertical slip casting pipe 5, the bottom of the next section precast pile 3 connects the stake point 7, all pre-buried vertical slip casting pipe 5 in two sections precast pile 3, the top of the next section precast pile 3 is equipped with ring flange 4 and with the steel bar welding of precast pile 3, the bottom of the last section precast pile 3 is equipped with ring flange 4 and with the steel bar welding of precast pile 3, it has slip casting shower nozzle 1 to weld on the vertical slip casting pipe 5 in the next section precast pile 3, slip casting shower nozzle stopper 2 is inserted in the slip casting shower nozzle 1 before the pile sinking, the next section precast pile 3 is by two ring flange 4 welded connection with the last section precast pile 3.
The cross section of the precast pile 3 is in any geometric shape (regular circle, square, pentagon, hexagon, octagon, ellipse, triangle, diamond, pentagon and the like, and the precast pile 3 can be a solid pile or a hollow pile).
The device used in the construction method for precast pile post-grouting further comprises an annular grouting guide pipe 6, wherein the annular grouting guide pipe 6 is pre-embedded in the lower precast pile section 3 and communicated with a vertical grouting guide pipe 5, a grouting nozzle 1 is welded on the annular grouting guide pipe 6, and a grouting nozzle plug 2 is inserted into the grouting nozzle 1 before pile sinking.
The flange plate 4 is provided with a reinforcing steel bar hole 41 for inserting a reinforcing steel bar in the precast pile 3 and is welded with the reinforcing steel bar, the flange plate 4 is provided with an annular semicircular groove 42, the upper flange plate 4 and the lower flange plate 4 are welded to form a groove with a circular section for injecting water and grouting, and a grouting through hole 43 is formed in the position of the annular semicircular groove 42. For example, the inner side of the flange of the hollow pile is provided with a concave-convex water stopping opening.
Example 1
The embodiment is a single-section precast pile: and (3) post-grouting at the pile end or post-grouting at the pile side or post-grouting at the pile end and one or more sections of pile sides or multi-section post-grouting at the pile side.
1. When the precast pile 3 is manufactured, a vertical grouting guide pipe 5 and an annular grouting guide pipe 6 are pre-buried in the precast pile 3. As shown in fig. 4 and 5. The end of the vertical grouting guide pipe 5 and the joint of the vertical grouting guide pipe 5 and the annular grouting guide pipe 6 are weldable steel pipes. The middle portion of the vertical grouting guide 5 may be a steel pipe or other pipe (e.g., a plastic pipe or a nylon pipe). The upper part of the vertical grouting pipe 5 is welded to the flange 4 at the top end of the precast pile 3 according to requirements, and the grouting pipe 5 can be fixed on the upper part of the pile by other flanges or no flange.
2. Manufacturing a grouting spray head 1: the grouting nozzle 1 is made of steel and can be welded, as shown in figure 1. As shown in fig. 2 and 3, the grouting nozzle plug 2 is made of a hard material soluble in water and cement paste, and the hard material soluble in water and cement paste is placed at the position (connection base) marked with 8 in fig. 7, 8 and 9 as required in the grouting sequence from the upper part to the lower part, from the side wall to the pile end. See fig. 11 at 8. If no hard substance dissolved in water and cement paste is required to be placed at the mark 8, the diameter of the mark 8 is equal to that of the vertical grouting pipe 5 and/or the annular grouting pipe 6.
3. When the grouting nozzle plug 2 is manufactured, a material for manufacturing the grouting nozzle plug 2 is put into the grouting nozzle 1, wherein a steel guard plate 21 shown in fig. 3 can be put into the grouting nozzle plug or not.
4. And (3) welding the grouting spray head 1 with the vertical grouting guide pipe 5 or the annular grouting guide pipe 6 according to requirements to enable the grouting spray head to be communicated with the outside. The opening of the grouting nozzle 1 may be directed in any direction. The grouting spray head 1 can be distributed along multiple points on the periphery of the pile, can be distributed up and down along multiple points on the side of the pile, and the grouting spray head 1 can be distributed along multiple points on the periphery of the pile tip 7 and can be distributed along multiple points on the periphery of the pile tip 7.
5. The precast pile 3 welded with the grouting nozzle 1 (the cross section of the precast pile 3 can be a pile of any geometric shape, and the precast pile 3 can be a hollow pile or a solid pile) is sunk into (driven) the required elevation.
6. When the precast pile 3 is stable, namely no longer floats upwards, no longer sinks and no displacement, water is injected at high pressure (the pressure is 0.5MPa-70MPa) through the vertical grouting guide pipe 5 and/or the annular grouting guide pipe 6, a grouting channel is opened, and the plug is opened by clear water.
7. After the water is boiled, pile end grouting or pile side wall grouting or combined pile end and pile side wall grouting (the grouting pressure is 1MPa-70MPa) can be independently carried out according to the vertical grouting guide pipe 5 and/or the annular grouting guide pipe 6 pre-buried in the precast pile 3.
Example 2
The embodiment is multi-section precast pile, pile end back grouting, pile side back grouting and pile end and pile side wall combined back grouting.
1. The flanges 4 on the precast piles 3 are manufactured according to fig. 6. (for example, the hollow pile should be provided with a concave-convex water stop groove at the inner side of the flange).
In fig. 6: the reinforcing steel bar holes 41 are used for welding with the reinforcing steel bars in the precast piles 3, the annular semicircular grooves 42 are used for welding with the upper flange plate and the lower flange plate to form a groove with a circular section, and the grouting through holes 43 are used for grouting.
2. When the precast pile 3 is manufactured (the cross section of the precast pile 3 can be in any geometric shape, the precast pile can be a hollow pile or a solid pile), the vertical grouting guide pipe 5 and/or the annular grouting guide pipe 6 are/is pre-embedded in the precast pile 3, and the end head of the vertical grouting guide pipe 5 and the joint of the vertical grouting guide pipe 5 and the annular grouting guide pipe 6 are welded steel pipes. The middle portion of the vertical grouting guide 5 may be a steel pipe or other pipe (e.g., a plastic pipe or a nylon pipe). The upper part of the vertical grouting pipe 5 is welded to the precast pile flange plate 4 as required. Others are as indicated in fig. 7-10.
Fig. 7 is a precast pile section without grouting requirement, fig. 8 is a precast pile section with side wall grouting requirement, fig. 9 is a pile end post-grouting and pile side wall post-grouting precast pile section, and fig. 10 is a precast pile section without grouting requirement.
3. The manufacturing, welding and installation of the grouting nozzle 1 and the grouting nozzle plug 2 are as follows: (1) and manufacturing a grouting spray head 1: the grouting spray head 1 is made of steel and can be welded as shown in figure 1; grouting nozzle plug 2 as shown in fig. 2, the grouting nozzle plug 2 is a soil block of hard substance soluble in water and cement paste. (2) When the grouting nozzle plug 2 is manufactured, the material for manufacturing the grouting nozzle plug 2 is put into the grouting nozzle 1, and a steel guard plate 21 shown in fig. 2 and 3 can be put into the grouting nozzle plug or not. (3) And welding the grouting nozzle 1 with the vertical grouting guide pipe 5 and/or the annular grouting guide pipe 6 according to requirements. Grouting nozzle 1 can be along 3 stake week multiple spot distributions of precast pile, can be along stake side multiple spot upper and lower distributions, and grouting nozzle 1 can be along 7 multiple spot distributions of stake point, can be along 7 side multiple spot upper and lower distributions of stake point.
4. Soil blocks of hard substances dissolved in water and cement paste are placed as required at the position marked with 8 (connection base) in fig. 7, 8 and 9 in the order of grouting from top to bottom, from side wall to pile end. See fig. 11 at 8. If no hard substance dissolved in water and cement paste is required to be placed at the mark 8, the diameter of the mark 8 is equal to that of the vertical grouting pipe 5 and/or the annular grouting pipe 6.
5. When the phenomena of floating, sinking and displacement do not occur after the pile sinking of the precast pile 3 is finished, the following operations are started: (1) and (3) high-pressure injected water (with the pressure of 0.5MPa-70MPa) is injected through a grouting guide pipe (the vertical grouting guide pipe 5 and/or the annular grouting guide pipe 6) to open a first section of side wall grouting channel and clear water is used for opening a plug. (2) After the clear water is plugged, cement paste or cement paste mixed with other substances is injected, and after the grouting is finished after a section of side wall. (3) The sphere (insoluble in water and cement slurry) was pushed into the grouting passage with the completion of grouting as shown in FIG. 13 by high-pressure water (pressure 0.5MPa-70 MPa). (4) And the other grouting channel is opened by high-pressure injection water (the pressure is 0.5MPa-70 MPa). And the last side wall grouting section or pile end grouting point is reached in such a reciprocating way, and the grouting after the whole pile is finished.
Example 3
The embodiment is the post-grouting of the pile end or a section of the side wall of the multi-section precast pile.
1. The flange 4 on the precast pile 3 is made according to fig. 6. The end of the vertical grouting guide pipe 5, the joint of the vertical grouting guide pipe 5 and the annular grouting guide pipe 6 are weldable steel pipes. The middle portion of the vertical grouting guide 5 may be a steel pipe or other pipe (e.g., a plastic pipe or a nylon pipe). The vertical grouting guide 5 and the annular grouting guide 6 have the same overall length and diameter.
2. The precast pile 3 is manufactured according to the selection of fig. 15, 16, 17 or 18 as required: in the figure, a vertical grouting guide pipe 5 and an annular grouting guide pipe 6 are both welded with the grouting nozzle 1. (1) The grouting nozzle 1 is made of steel and can be welded as shown in figure 1, the vertical grouting guide pipe 5 and the annular grouting guide pipe 6 are communicated with the outside through the grouting nozzle 1, and the grouting nozzle 1 can face any direction. Grouting nozzle plug 2 as shown in fig. 2, the grouting nozzle plug 2 is a soil block of hard substance soluble in water and cement paste. (2) When the grouting nozzle plug 2 is manufactured, the material for manufacturing the grouting nozzle plug 2 is put into the grouting nozzle 1, and a steel guard plate 21 shown in fig. 2 and 3 can be put into the grouting nozzle plug or not. (3) Grouting nozzle 1 can be along the stake week multiple spot distribution of precast pile 3, can be along stake side multiple spot distribution from top to bottom, and grouting nozzle 1 can be along 7 multiple spot distributions of stake point, can be along 7 multiple spot arrangements from top to bottom of stake point side.
3. When using some or all of the precast piles in fig. 15 or 16 or 17 or 18 (the cross section of the precast pile 3 may be any geometrical shape, the precast pile 3 may be a solid pile, or a hollow pile) to sink to the required height.
4. When the precast pile 3 is stable, namely no longer floats upwards and sinks and no displacement, water with the pressure of 0.5-70 MPa is injected at high pressure through the vertical grouting guide pipe 5 and/or the annular grouting guide pipe 6, a grouting channel is opened, and the plug is opened by clear water.
5. And after the water is boiled, cement paste or cement paste mixed with other substances is injected through the vertical grouting guide pipe 5 and/or the annular grouting guide pipe 6, and post-grouting on the side of the pile or post-grouting at the end of the pile is finished.
The high-pressure injected water in the embodiment is clear water; i.e. tap water or well water.
The cement paste in the embodiment is as follows: cement slurry formed by stirring and mixing water and cement; the ratio of water to cement can be 0.43-1 according to geological conditions.
The precast pile 2 is a hollow pile, and a concave-convex water stopping groove is arranged on the annular inner side of the flange plate 4.
The manufacturing process of the grouting nozzle plug 2 and the isolating plug 9 comprises the following steps: 0.1-5kg of cotton is added in per cubic meter of clay or viscous alkaline earth. Adding water to make the water content of soil reach omega (%) 10-50. Secondly, after the substances are added: stirring, beating, extrusion forming and drying to obtain the liquidity index I of the soil blockLTo reach 0 to more than or equal to ILOr 0 < IL≤0.25。
Description of the drawings:
1. in order to reduce the resistance during grouting, a grouting nozzle is generally arranged according to the following principle. The number of grouting nozzles is equal to the cross section area of a grouting guide pipe/the cross section area of a single grouting nozzle (without hard requirement), and the diameter of the grouting nozzle is about 5mm generally.
2. The pile end grouting nozzle is sometimes provided with a nozzle with the same diameter as the grouting guide pipe. The grouting nozzle is arranged at the bottommost end of the pile.
3. The pile side grouting is generally provided with an annular grouting pipe at each grouting section and a grouting spray head on the annular grouting pipe according to geological conditions and a pile forming process (whether drilling is carried out before pile sinking and then pile sinking is carried out, the geological conditions, the lithology of soil and the like) adopted during pile forming. The number of grouting nozzles is equal to the cross section area of a grouting guide pipe/the cross street area of a single grouting nozzle.
4. The diameter of the grouting conduit is generally 4 minutes (nominal diameter 15mm), 6 minutes (nominal diameter 20mm) and 1 inch (nominal diameter 25 mm).
The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A construction method for post-grouting of a precast pile, which is characterized in that,
sinking a precast pile which is pre-embedded with a vertical grouting guide pipe and welded with a grouting spray head on the vertical grouting guide pipe into a required elevation;
step two, when the precast pile is stable, namely the precast pile does not float upwards, sink and move, high-pressure injection water is injected through the vertical grouting guide pipe to dissolve and flush the grouting nozzle plug, and then a grouting channel is opened and water is removed to open the plug;
thirdly, after the plug is opened by clear water, pile end grouting or pile side wall grouting is carried out according to a vertical grouting guide pipe pre-embedded in the precast pile, or combined grouting of the pile end and the pile side wall is carried out;
step one, a grouting nozzle plug is plugged into a grouting nozzle before the precast pile is sunk;
in the second step, the pressure of the high-pressure injection water is 0.5MPa-70 MPa;
in the third step, the grouting pressure is 1MPa-70 MPa.
2. The device used in the construction method of precast pile post-grouting according to claim 1 is characterized by comprising a grouting nozzle (1), a precast pile (3) and a vertical grouting guide pipe (5), wherein a pile tip (7) is arranged at the bottom end of the precast pile (3), the vertical grouting guide pipe (5) is pre-embedded in the precast pile (3), the grouting nozzle (1) is welded on the vertical grouting guide pipe (5), and a grouting nozzle plug (2) is inserted into the grouting nozzle (1) before pile sinking.
3. The apparatus for precast pile post-grouting construction method according to claim 2, wherein the cross section and vertical section of the precast pile (3) are geometric shapes, and the precast pile (3) is a solid pile or a hollow pile.
4. The device used in the construction method of precast pile post-grouting according to claim 3, characterized by further comprising an annular grouting guide pipe (6), wherein the annular grouting guide pipe (6) is pre-embedded in the precast pile (3) and is communicated with the vertical grouting guide pipe (5), the annular grouting guide pipe (6) is welded with the grouting nozzle (1), and the grouting nozzle plug (2) is inserted into the grouting nozzle (1) before pile sinking.
5. The device used in the construction method of precast pile post-grouting according to claim 4, characterized in that one to five vertical grouting pipes (5) are pre-buried in the precast pile (3), and one to five vertical grouting pipes (5) are uniformly distributed in the precast pile (3), and at least one grouting nozzle (1) is welded on each vertical grouting pipe (5).
6. The apparatus for precast pile post-grouting construction method according to claim 5, wherein at least one grouting nozzle (1) is welded to the annular grouting guide pipe (6).
7. The device used in the construction method of precast pile post grouting according to claim 1 is characterized by comprising a grouting spray head (1) and two sections of precast piles (3), ring flange (4) and vertical slip casting pipe (5), the bottom of the next section of precast pile (3) is stake point (7), all pre-buried vertical slip casting pipe (5) in two sections of precast pile (3), the top of the next section of precast pile (3) is equipped with ring flange (4) and with the steel bar welding of precast pile (3), the bottom of the last section of precast pile (3) is equipped with ring flange (4) and with the steel bar welding of precast pile (3), the welding has slip casting shower nozzle (1) on vertical slip casting pipe (5) in the next section of precast pile (3), slip casting shower nozzle stopper (2) are inserted in slip casting shower nozzle (1) before the pile sinking, next section of precast pile (3) and last section of precast pile (3) are by two ring flange (4) welded connection.
8. The apparatus for the precast pile post-grouting construction method according to claim 7, wherein the cross section of the precast pile (3) is a geometric shape, and the precast pile (3) is a solid pile or a hollow pile.
9. The device used in the construction method of precast pile post-grouting according to claim 8, characterized by further comprising an annular grouting guide pipe (6), wherein the annular grouting guide pipe (6) is pre-buried in the lower precast pile (3) and is communicated with the vertical grouting guide pipe (5), the grouting nozzle (1) is welded on the annular grouting guide pipe (6), and the grouting nozzle plug (2) is inserted into the grouting nozzle (1) before pile sinking.
10. The device for the precast pile post-grouting construction method according to claim 9, characterized in that the flange (4) is provided with a reinforcement hole (41) for inserting the reinforcement in the precast pile (3) and welding with the reinforcement, the flange (4) is provided with an annular semicircular groove (42), a groove with a circular section is formed for water injection grouting after the welding of the upper and lower flanges (4), and the annular semicircular groove (42) is provided with a grouting through hole (42).
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Application publication date: 20210525 |