CN110939127A - Steel pipe pile construction method for protecting subway pier - Google Patents
Steel pipe pile construction method for protecting subway pier Download PDFInfo
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- CN110939127A CN110939127A CN201911191984.5A CN201911191984A CN110939127A CN 110939127 A CN110939127 A CN 110939127A CN 201911191984 A CN201911191984 A CN 201911191984A CN 110939127 A CN110939127 A CN 110939127A
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- steel pipe
- subway
- grouting
- sleeve valve
- protection wall
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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
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
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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
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- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention discloses a steel pipe pile construction method for protecting subway piers, which comprises the steps of determining the position of a protection wall according to an edge line of a tunnel to be excavated, and constructing the protection wall at the position of the protection wall so as to isolate the subway piers from the tunnel to be excavated; and constructing sleeve valve pipes around the subway piers so as to ensure that the sleeve valve pipes are uniformly distributed around the subway piers. According to the invention, the soil body in the range of the viaduct pier foundation is cut off through the protection wall, so that the earthwork loss of the viaduct pier foundation caused by unbalanced soil pressure in the tunnel excavation process is avoided, the lateral deformation caused by unbalanced lateral pressure of the pier foundation is prevented, and the subway pier is wrapped by grouting through the sleeve valve pipe, so that the water loss in the range of the pier foundation can be avoided, and the function of pre-reinforcing the viaduct pier foundation is achieved.
Description
Technical Field
The invention relates to the technical field of engineering construction, in particular to a steel pipe pile construction method for protecting subway piers.
Background
With the continuous development of urban rail transit lines in China, subway viaducts are increasingly used for subway construction, shallow-buried and underground-excavated tunnels are more and more common, and the conditions that lines of the shallow-buried and underground-excavated tunnels penetrate through water-rich sand layers, fault fracture zones and other adverse geological conditions are increased year by year. The condition of shallow buried underground excavation tunnel is complicated, the condition of crossing subway elevated bridge pier exists during construction, especially when crossing unfavorable geology, can produce very big influence to subway elevated bridge pier, and in order to guarantee subway normal operation, the smooth construction of shallow buried underground excavation tunnel simultaneously, the mode that adopts little pipe slip casting mostly to pre-reinforce subway elevated bridge pier, in order to guarantee the security of shallow buried underground excavation tunnel construction, but adopt this construction method of little pipe slip casting, there is the slip casting scope difficult to control, run thick liquid and leak thick liquid phenomenon serious and polluted environment's problem.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a steel pipe pile construction method for protecting subway piers, aiming at the defects of the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a steel pipe pile construction method for protecting subway piers, the method comprising:
determining the position of a protection wall according to the edge line of the tunnel to be excavated, and constructing the protection wall at the position of the protection wall so as to isolate the subway pier from the tunnel to be excavated;
and constructing sleeve valve pipes around the subway piers so that the sleeve valve pipes are uniformly distributed around the subway piers, wherein all the sleeve valve pipes are positioned on one side of the protection wall far away from the tunnel to be excavated.
According to the steel pipe pile construction method for protecting the subway pier, protection walls are arranged on two sides of the tunnel to be excavated.
According to the steel pipe pile construction method for protecting the subway pier, a full-section grouting line is arranged between the protection wall and the corresponding edge line of the tunnel to be excavated, and a gap is formed between the protection wall and the full-section grouting line.
The steel pipe pile construction method for protecting the subway pier comprises the step of constructing a protection wall, wherein the protection wall comprises a plurality of steel pipe piles which are arranged at intervals, and the distance between any two adjacent steel pipe piles is equal.
The steel pipe pile construction method for protecting the subway pier comprises the steps that the steel pipe pile comprises a plurality of steel pipes which are connected end to end, each steel pipe comprises a steel pipe body, a plurality of grouting holes are formed in the steel pipe pile bodies, and the grouting holes are arranged in a quincunx shape.
According to the steel pipe pile construction method for protecting the subway pier, one end of the steel pipe body is conical, and the other end of the steel pipe body is provided with the tightening hoop; when the two steel pipes are connected, the conical end of one steel pipe is inserted into the end of the other steel pipe provided with the tightening hoop.
The steel pipe pile construction method for protecting the subway pier comprises the following concrete construction processes of:
determining the initial construction position of the protection wall according to the position of the protection wall, and drilling and placing steel pipes at the initial construction position;
after the steel pipe is placed, grouting is carried out on the steel pipe;
and after the steel pipe grouting is finished, constructing the steel pipe pile at a preset position away from the steel pipe pile until the construction position of the protection wall is finished so as to finish the construction of the protection wall.
The steel pipe pile construction method for protecting the subway pier comprises the following concrete construction processes of the sleeve valve pipe:
measuring lofting to determine the location of each lead hole;
and constructing a pilot hole, a lower sleeve valve pipe and grouting at each pilot hole position in sequence according to each pilot hole position and a preset rule so as to finish sleeve valve pipe construction, wherein the sleeve valve pipe is cleaned after the sleeve valve pipe is lowered.
The steel pipe pile construction method for protecting the subway pier comprises the following steps of constructing a pilot hole, a lower sleeve valve pipe and grouting at each pilot hole position in sequence according to a preset rule:
determining the positions of the guide holes in the row according to the positions of the guide holes, and conducting construction guide holes, lower sleeve valve pipes and grouting on the positions of the guide holes in the row at intervals of one guide hole;
and after the construction of the row of sleeve valve pipes is finished, carrying out construction hole leading, sleeve valve pipe lowering and grouting on the row of unfinished hole leading positions.
The steel pipe pile construction method for protecting the subway pier comprises the steps that grouting liquid for grouting comprises cement and a water glass solution, wherein the volume ratio of the cement to the water glass solution is 1: 1.
Has the advantages that: compared with the prior art, the invention provides a steel pipe pile construction method for protecting subway piers, which comprises the steps of determining the position of a protection wall according to the edge line of a tunnel to be excavated, and constructing the protection wall at the position of the protection wall so as to isolate the subway piers from the tunnel to be excavated; and constructing sleeve valve pipes around the subway piers so as to ensure that the sleeve valve pipes are uniformly distributed around the subway piers. According to the invention, the soil body in the range of the viaduct pier foundation is cut off through the protection wall, so that the earthwork loss of the viaduct pier foundation caused by unbalanced soil pressure in the tunnel excavation process is avoided, the lateral deformation caused by unbalanced lateral pressure of the pier foundation is prevented, and the subway pier is wrapped by grouting through the sleeve valve pipe, so that the water loss in the range of the pier foundation can be avoided, and the function of pre-reinforcing the viaduct pier foundation is achieved.
Drawings
Fig. 1 is a flowchart of a steel pipe pile construction method for protecting a subway pier provided by the present invention.
Fig. 2 is a schematic view of a steel pipe pile construction method for protecting a subway pier provided by the invention.
Fig. 3 is a schematic view of arrangement of grouting holes of steel pipes in the steel pipe pile construction method for protecting subway piers according to the present invention.
Fig. 4 is a schematic diagram of a reinforcement cage in the steel pipe pile construction method for protecting a subway pier provided by the invention.
Detailed Description
The invention provides a steel pipe pile construction method for protecting subway piers, which is further described in detail below by referring to the attached drawings and embodiments in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It should also be noted that the same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The invention will be further explained by the description of the embodiments with reference to the drawings.
As shown in fig. 1, the method for constructing a steel pipe pile for protecting a subway pier includes:
s10, determining the position of a protection wall according to the edge line of the tunnel to be excavated, and constructing the protection wall at the position of the protection wall so as to isolate the subway pier from the tunnel to be excavated;
s20, constructing sleeve valve pipes around the subway pier so that the sleeve valve pipes are uniformly arranged around the subway pier, wherein all the sleeve valve pipes are located on one side, far away from the tunnel to be excavated, of the protection wall.
The embodiment cuts off the soil body of viaduct pier foundation scope through the steel-pipe pile, avoids tunnel excavation in-process soil pressure unbalance and causes viaduct pier foundation earthwork to run off, prevents pier foundation lateral pressure unbalance and causes the lateral deformation, again through sleeve valve pipe slip casting parcel subway pier, can avoid the rivers of pier foundation within range to lose, plays the effect of consolidating in advance to viaduct pier foundation.
Specifically, in the step S10, the tunnel edge is an edge of a tunnel to be excavated, and the tunnel to be excavated has two edges. From this, when waiting to excavate the tunnel both sides all have the overhead pier, all be provided with the protecting wall waiting to excavate the tunnel both sides to will wait to excavate the regional overhead pier of the excavation that the tunnel corresponds and separate empty through the protecting wall. In addition, when the two sides of the tunnel to be excavated are provided with the protection walls, the distance between each protection wall and the corresponding edge of the tunnel to be excavated is equal. In addition, when tunnel excavation, can carry out the slip casting to the tunnel to the slip casting position can be located outside the tunnel edge, thereby when setting up the retaining wall, need set up the retaining wall before the slip casting edge, in order to avoid the retaining wall to the influence of slip casting, also can avoid the influence of slip casting to overhead pier simultaneously. Accordingly, in one implementation manner of the present embodiment, as shown in fig. 2, a full-face grouting line 20 is disposed between the protection wall 30 and the corresponding edge line 10 of the tunnel to be excavated, and a gap is formed between the protection wall 30 and the full-face grouting line 20, so that when grouting and drilling are performed on the tunnel, the foundation earthwork of the elevated pier cannot be lost due to unbalanced soil pressure.
Further, in one implementation manner of this embodiment, the protection wall includes a plurality of steel pipe piles arranged at intervals, and a distance between any two adjacent steel pipe piles is equal. For example, the distance between two adjacent steel pipes is 300mm, etc. Therefore, when the protective wall is constructed, the steel pipe piles can be constructed in sequence according to the arrangement sequence of the steel pipe piles, namely after the steel pipe pile positioned at the first in the arrangement sequence is constructed, the steel pipe pile positioned at the second in the arrangement sequence is constructed, and the process is analogized until the steel pipe pile positioned at the last. In addition, the protection wall formed by the plurality of steel pipe piles may be linear, diagonal, curved, and the like, the distance between two adjacent steel pipe piles may be determined according to the shape of the protection wall formed by the plurality of steel pipe piles, when the protection wall is linear and diagonal, the distance between two adjacent steel pipe piles refers to a linear distance between the two steel pipe piles, when the protection wall is curved, the distance between two adjacent steel pipe piles refers to an arc distance between the two steel pipe piles, and the arc curvature may be the same as the curvature of the corresponding curve.
Further, in an implementation manner of this embodiment, the steel pipe pile includes a plurality of steel pipes and the steel pipes are sequentially connected end to end. The steel pipe comprises a steel pipe body, the steel pipe pile body can be a hot-rolled seamless steel pointed pipe with the wall thickness of 10mm, and the outer diameter of the cylindrical part of the hot-rolled seamless steel pointed pipe can be 108 mm. The one end of steel pipe body is the toper type, and the other end is provided with and steps up the hoop, and wherein, the one end of toper type is the front end, and the one end that is provided with and steps up the hoop is the tail end, and when two steel pipes were connected, the front end of a steel pipe was inserted in the rear end of another steel pipe to the junction of two steel pipes is fixed through stepping up the hoop, can provide the fastness that two steel pipes connect like this. In addition, in an implementation of this embodiment, the junction of two steel pipes can adopt the screw thread to connect, and screw thread section length is greater than 150mm, can improve the joining force between two adjacent steel pipes like this, prevents to lead to the steel pipe to drop because of the moment of torsion is too big, influences follow-up construction. In addition, the joints of two adjacent steel pipes are staggered, and the staggered length is not less than 1 m. That is to say, the lengths of two adjacent steel pipes are different, for example, the length of the first section of steel pipe is 2m, the length of the second section of steel pipe is 1m, the length of the third section of steel pipe is 2, and the two adjacent steel pipes are alternately arranged in sequence
Further, as shown in fig. 3, the steel pipe body is provided with a plurality of grouting holes, the plurality of grouting holes are arranged in a quincunx shape, the distance between two adjacent grouting holes in the same row is 15cm, and the distance between two adjacent rows is 15 cm. The aperture of the grouting hole can be 10mm, and the hole distance between two adjacent grouting holes can be 150 mm. In addition, the steel pipe body sets up only thick liquid section, only thick liquid section is the afterbody (the gap section) of steel pipe body, wherein, only thick liquid section's length can be 1 m.
Further, in an implementation manner of this embodiment, the construction process of the protection wall specifically includes:
determining the initial construction position of the protection wall according to the position of the protection wall, and drilling and placing steel pipes at the initial construction position;
after the steel pipe is placed, grouting is carried out on the steel pipe;
and after the steel pipe grouting is finished, constructing the steel pipe pile at a preset position away from the steel pipe pile until the construction position of the protection wall is finished so as to finish the construction of the protection wall.
Specifically, the steel pipe pile is a steel pipe pile which is first constructed and is located at a starting construction position of the protection wall, and then the steel pipe piles are sequentially constructed in the order of arrangement. Wherein, the bore diameter of the drill hole can be 120mm, and the depth of the drill hole can be 16 m. After drilling is completed, a plurality of steel pipes included in the steel pipe pile need to be inserted, namely after drilling is completed, the steel pipes included in the steel pipe pile are connected end to form a steel pipe to be lowered, and the steel pipe to be lowered is inserted into a drill hole. In addition, carry out the slip casting to the steel pipe, can place a plurality of steel reinforcement cages and slip casting pipe in to the steel pipe, and through slip casting pipe is to the intraductal slip casting of pipe canopy, can improve the bending resistance of pipe canopy like this through the steel reinforcement cage.
Further, in steel reinforcement cage and slip casting pipe can insert the pipe canopy in step, a plurality of steel reinforcement cages are arranged along pipe canopy extending direction interval to distance between two arbitrary adjacent steel reinforcement cages equals (for example, distance between two arbitrary adjacent steel reinforcement cages is 5m etc.), can improve the bending resistance of pipe canopy through set up the steel reinforcement cage in the pipe canopy like this. In addition, in a possible implementation manner of this embodiment, as shown in fig. 4, the reinforcement cage employs 4 main bars, and the 4 main bars may be connected by a fixing ring, wherein the 4 main bars may be uniformly arranged on the fixing ring along a circumferential direction, and each main bar is welded to the fixing ring through two symmetrically arranged welding points. The main muscle can be 25 mm's screw-thread steel, solid fixed ring can be the steel pipe that the external diameter is 42mm wall thickness and is 3.5 mm. In addition, in a possible implementation manner of this embodiment, the grouting material may use cement slurry, the grouting sequence is performed from a low hole site to a high hole site in principle, the whole hole is grouted at one time, and cement slurry is used to fill the steel pipe after grouting. Furthermore, in one possible implementation of the present embodiment, the grouting fluid may be M30 cement slurry; the initial pressure in the grouting pressure is 0.5-1.0 MPa, and the final pressure is 1.0-1.5 MPa. Of course, in practical application, a field grouting test can be performed before grouting, and grouting parameters are adjusted according to actual conditions to obtain grouting construction data of the steel pipe pile.
Further, in step S20, the construction process of the sleeve valve tube specifically includes:
s21, measuring lofting to determine the positions of the guide holes;
and S22, constructing a lead hole, a lower sleeve valve pipe and grouting at each lead hole position according to each lead hole position and a preset rule to finish sleeve valve pipe construction, wherein the sleeve valve pipe is cleaned after the sleeve valve pipe is lowered.
Specifically, the lead hole position includes a coordinate position of the lead hole and a lead hole depth, where the coordinate position of the lead hole may be calculated according to the coordinates of the laid control point, and the determination process of the lead hole depth may be to use a total station to discharge a hole position and use a level to measure a ground elevation to determine the lead hole depth.
Further, the construction guide hole comprises a drill hole and a lower pipe, the drill hole is drilled by adopting a sleeve retaining wall water flushing method, and the drilling depth reaches a grouting consolidation section. Wherein the diameter of the drilled hole is 100mm, the inclination of the drilled hole is not more than 1 percent, and the slurry protective wall is used when the drilled hole is formed, so that the hole collapse of the drilled hole can be prevented. The tube lowering process may specifically be: the sleeve valve pipes are connected according to the depth of the guide hole, sleeves (such as PVC sleeves and the like) are connected at valve pipe interfaces of the sleeve valve pipes, and the sleeve valve pipes and the sleeves are connected through adhesives (such as U-PVC adhesives). Furthermore, the method is simple. The sleeve valve tube is deeper than the depth of the pilot hole, so that after the sleeve valve tube is drilled, the upper end of the sleeve valve tube can be exposed to the ground (for example, 20cm), the lower opening of the connected sleeve valve tube is sealed by a sharp bottom, and finally after the sleeve valve tube is connected, the sleeve valve tube is drilled in the pilot hole and is lowered to the bottom of the pilot hole.
And after the hole leading construction is finished, cleaning the hole by using high-pressure water, and reducing the specific gravity of sediment and slurry in the hole. In the grouting process, the grouting inner pipe can be a seamless steel pipe with the thickness of 50x3.5mm and is connected with the double-plug pipe. And the length of the grouting pipe is not more than 50cm when grouting is carried out by lifting the grouting pipe once. In addition, the quick-setting cement mortar is adopted to block within the distance range from the ground around the orifice to 1m below the ground, so that the slurry bleeding phenomenon in the grouting process is prevented. Wherein the grouting slurry is cement-water-glass double-liquid slurry with the volume ratio of 1:1, the cement slurry is water ash with the volume ratio of 1:1, the concentration of the water-glass solution can Be 6-10Be', and the setting time of the double-slurry is not less than 120 s.
Further, in the grouting process, the initial grouting pressure may be 0.2 to 0.4Mpa, and the stable pressure may be 0.6 to 0.9 Mpa. The grouting pressure should have two peak values during grouting, the first time is an initial grouting stage, and then the pressure is gradually reduced to stable pressure. The second grouting pressure peak occurs at the end of the grouting, and the grouting can be stopped when the second grouting pressure reaches 1.2 MPa.
Further, in an implementation manner of this embodiment, in order to reduce the mutual influence between the holes, during the construction, grouting is performed every two holes, and after the grouting of the sleeve valve holes in one row is finished, grouting is performed on the sleeve valve holes between the two holes. Correspondingly, in an implementation manner of this embodiment, the sequentially constructing the pilot holes, the lower sleeve valve tubes and the grouting at the pilot hole positions according to the preset rule specifically includes:
determining the positions of the guide holes in the row according to the positions of the guide holes, and conducting construction guide holes, lower sleeve valve pipes and grouting on the positions of the guide holes in the row at intervals of one guide hole;
and after the construction of the row of sleeve valve pipes is finished, carrying out construction hole leading, sleeve valve pipe lowering and grouting on the row of unfinished hole leading positions.
Specifically, all the lead holes are arranged in a quincunx shape, the distance between two adjacent lead holes in the same row can be 400mm, and the distance between two adjacent rows is also 400 mm. In addition, for a bearing platform needing to be provided with an isolation pile, sleeve valve pipe construction needs to be carried out after the isolation pile construction is finished.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A steel pipe pile construction method for protecting subway piers is characterized by comprising the following steps:
determining the position of a protection wall according to the edge line of the tunnel to be excavated, and constructing the protection wall at the position of the protection wall so as to isolate the subway pier from the tunnel to be excavated;
and constructing sleeve valve pipes around the subway piers so that the sleeve valve pipes are uniformly distributed around the subway piers, wherein all the sleeve valve pipes are positioned on one side of the protection wall far away from the tunnel to be excavated.
2. The steel pipe pile construction method for protecting subway piers according to claim 1, wherein protection walls are provided on both sides of the tunnel to be excavated.
3. The steel pipe pile construction method for protecting the subway pier according to claim 1 or 2, wherein a full-face grouting line is arranged between the protection wall and the corresponding edge line of the tunnel to be excavated, and a gap is formed between the protection wall and the full-face grouting line.
4. The steel pipe pile construction method for protecting the subway pier according to claim 1 or 2, wherein the protection wall includes a plurality of steel pipe piles arranged at intervals, and a distance between any two adjacent steel pipe piles is equal.
5. The steel pipe pile construction method for protecting subway piers according to claim 4, wherein the steel pipe pile comprises a plurality of steel pipes connected end to end, the steel pipes comprise steel pipe bodies, a plurality of grouting holes are formed in the steel pipe pile bodies, and the plurality of grouting holes are arranged in a quincunx shape.
6. The steel pipe pile construction method for protecting the subway pier as claimed in claim 5, wherein one end of said steel pipe body is tapered, and the other end is provided with a tightening hoop; when the two steel pipes are connected, the conical end of one steel pipe is inserted into the end of the other steel pipe provided with the tightening hoop.
7. The steel pipe pile construction method for protecting subway piers according to claim 5, wherein the construction process of the protection wall specifically comprises:
determining the initial construction position of the protection wall according to the position of the protection wall, and drilling and placing steel pipes at the initial construction position;
after the steel pipe is placed, grouting is carried out on the steel pipe;
and after the steel pipe grouting is finished, constructing the steel pipe pile at a preset position away from the steel pipe pile until the construction position of the protection wall is finished so as to finish the construction of the protection wall.
8. The steel pipe pile construction method for protecting subway piers according to claim 1, wherein the construction process of the sleeve valve pipe specifically comprises:
measuring lofting to determine the location of each lead hole;
and constructing a pilot hole, a lower sleeve valve pipe and grouting at each pilot hole position in sequence according to each pilot hole position and a preset rule so as to finish sleeve valve pipe construction, wherein the sleeve valve pipe is cleaned after the sleeve valve pipe is lowered.
9. The steel pipe pile construction method for protecting subway piers according to claim 8, wherein the step of constructing the pilot holes, the lower sleeve valve pipes and the grouting at each pilot hole position in sequence according to a preset rule specifically comprises:
determining the positions of the guide holes in the row according to the positions of the guide holes, and conducting construction guide holes, lower sleeve valve pipes and grouting on the positions of the guide holes in the row at intervals of one guide hole;
and after the construction of the row of sleeve valve pipes is finished, carrying out construction hole leading, sleeve valve pipe lowering and grouting on the row of unfinished hole leading positions.
10. The steel pipe pile construction method for protecting subway piers according to claim 8 or 9, wherein the grouting liquid of the grouting includes cement and water glass solution, wherein a volume ratio of the cement to the water glass solution is 1: 1.
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| CN201911191984.5A CN110939127A (en) | 2019-11-28 | 2019-11-28 | Steel pipe pile construction method for protecting subway pier |
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| CN201911191984.5A CN110939127A (en) | 2019-11-28 | 2019-11-28 | Steel pipe pile construction method for protecting subway pier |
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| CN113585319A (en) * | 2021-08-30 | 2021-11-02 | 中庆建设有限责任公司 | Pile foundation construction method |
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Application publication date: 20200331 |