CN111287184A - Pile pressing device and method - Google Patents

Pile pressing device and method Download PDF

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Publication number
CN111287184A
CN111287184A CN202010239669.1A CN202010239669A CN111287184A CN 111287184 A CN111287184 A CN 111287184A CN 202010239669 A CN202010239669 A CN 202010239669A CN 111287184 A CN111287184 A CN 111287184A
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China
Prior art keywords
pile
uplift
piles
center
variable thrust
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Pending
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CN202010239669.1A
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Chinese (zh)
Inventor
刘云浪
傅学怡
吴兵
吴国勤
周坚荣
冯叶文
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CCDI International Shenzhen Design Consultants Co Ltd
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CCDI International Shenzhen Design Consultants Co Ltd
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Priority to CN202010239669.1A priority Critical patent/CN111287184A/en
Publication of CN111287184A publication Critical patent/CN111287184A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
    • E02D7/20—Placing by pressure or pulling power

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)

Abstract

The invention discloses a pile pressing device and method, and relates to the technical field of structural engineering. The position and the bearing capacity of the pile to be pressed in are not required, the application range is wide, the process is simple, and the cost is low. The pile pressing device comprises a compression pile, an uplift pile, a variable thrust jack and a counter-force beam; the top of the pressure-resistant pile is provided with a variable thrust jack, the uplift pile is arranged on one side of the pressure-resistant pile, one end of a counter-force beam is arranged above the ejection end of the variable thrust jack, the middle part of the counter-force beam is flexibly connected with the top of the uplift pile, and the other end of the counter-force beam is provided with a holding device connected with the pile to be pressed; the invention also provides a pile pressing method adopting the pile pressing device, which comprises the steps of calculating the number of the anti-pressing piles and the anti-pulling piles, then driving the anti-pressing piles and the anti-pulling piles into a soil layer at the bottom of the foundation pit, starting the variable thrust jack, and gradually increasing the thrust of the variable thrust jack until the variable thrust jack reaches a set value. The invention can be used for pressing the pile to be pressed into the set holding layer.

Description

Pile pressing device and method
Technical Field
The invention relates to the technical field of structural engineering, in particular to a pile pressing device and a pile pressing method.
Background
At present, when constructing pile foundations such as prestressed concrete pipe piles, prestressed concrete square piles, steel piles and the like, a hammering method, a static pressure method and the like are generally adopted. The hammering method utilizes the instantaneous impact mechanical energy when the pile hammer falls down to overcome the resistance of the soil body to the pile body, so that the static equilibrium state of the pile body is destroyed, the pile body sinks, a new static equilibrium state is reached, the pile head is repeatedly hammered, and the pile body also sinks continuously. Static pressure method is to press the pile into the soil by using static pressure without vibration and noise. No matter pile sinking is carried out by adopting a hammering method or a static pressure method, because the existing large-scale pile driving or pressing equipment has a larger operation radius, and the distance between a pile clamping device of the equipment and the center of the equipment is generally smaller than the operation radius, the existing large-scale pile driving or pressing equipment cannot construct the pile to be pressed which has larger bearing capacity and is close to the side wall of the foundation pit, and when the space of the foundation pit is enough, the existing technology generally replaces the pile with the larger bearing capacity with a plurality of piles with smaller bearing capacity, so that the method has complicated procedures and high cost; when the space of the foundation pit is limited, even if the piles with larger bearing capacity are replaced by the densely distributed piles with smaller bearing capacity, the total bearing capacity may still be insufficient, and at this time, the design scheme needs to be readjusted, so that the cost is higher.
Disclosure of Invention
The embodiment of the invention provides a pile pressing device and method, which have no requirements on the position and the bearing capacity of a pile to be pressed in, and have the advantages of wide application range, simple process and lower cost.
To achieve the above object, in one aspect, an embodiment of the present invention provides a pile driving apparatus including a compression resistant pile; the uplift pile is arranged on one side of the compression pile; the variable thrust jack is arranged at the top of the compressive pile, and the fixed end of the variable thrust jack is connected to the top surface of the compressive pile; one end of the counter-force beam is arranged above the ejection end of the jack, and the middle of the counter-force beam is flexibly connected with the top of the uplift pile; the other end of the counter-force beam is provided with a holding device, and the holding device is used for being connected with a pile to be pressed; and the direction of the tensile force transmitted by the counter-force beam born by the uplift pile is parallel to that of the compressive force transmitted by the counter-force beam born by the compression-resistant pile.
The pile pressing device provided by the embodiment of the invention comprises an anti-pressing pile, an anti-pulling pile, a variable thrust jack and a counter-force beam; the uplift pile is arranged on one side of the uplift pile, the top of the uplift pile is connected with the fixed end of a variable-thrust jack, one end of a counter-force beam is arranged above the ejection end of the jack, the middle part of the counter-force beam is flexibly connected with the top of the uplift pile, the direction of the tensile force transmitted by the counter-force beam born by the uplift pile is parallel to the direction of the pressure transmitted by the counter-force beam born by the uplift pile, so that the two ends of the counter-force beam can move up and down by taking the flexible connection point as a fulcrum, and the other end of the counter-force beam is provided with a holding device; according to the lever principle, when the variable thrust jack pushes one end of the counterforce beam upwards, the other end of the counterforce beam moves downwards, pressure is applied to the pile to be pressed in through the holding device, the pile to be pressed in is finally pressed into a required holding layer along with the gradual increase of the thrust of the variable thrust jack, and the bearing capacity of the pile to be pressed in meets the setting requirement; the holding device is arranged at the end part of the reaction beam, and has small requirement on the operation space, so that the holding device can be connected with a pile positioned in the middle of a foundation pit and also can be connected with a side pile or an angle pile close to the side wall of the foundation pit; therefore, the embodiment of the invention has no requirements on the position and the bearing capacity of the pile to be pressed in, has wide application range, does not need to replace a large pile with a plurality of small piles, has simple process and low cost, and does not need to change the design scheme.
In another aspect, an embodiment of the present invention provides a pile driving method using the pile driving device, including calculating the number of the compression resistant piles and the uplift piles; driving the compression resistant pile and the uplift pile into a soil layer at the bottom of the foundation pit; and starting the variable thrust jack, and gradually increasing the thrust of the variable thrust jack until the variable thrust jack reaches a set thrust value.
According to the pile driving method using the pile driving device provided by the embodiment of the invention, the pile driving method is a using method of the pile driving device, so that the pile driving method provided by the embodiment of the invention can solve the same technical problems and produce the same technical effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of a pile driving apparatus according to an embodiment of the present invention;
FIG. 2 is a top view of a pile driving apparatus according to an embodiment of the present invention;
FIG. 3 is a top view of a pile driving apparatus according to an embodiment of the present invention;
fig. 4 is a schematic connection diagram of the uplift pile, the first force transmission member and the reaction beam in the pile pressing device according to the embodiment of the invention;
fig. 5 is a mechanical schematic diagram of a pile driving device according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
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 otherwise specified.
Referring to fig. 1, an embodiment of the present invention provides a pile pressing apparatus, including an uplift pile 2, a compression-resistant pile 3, a variable thrust jack 10, and a reaction beam 4; the uplift pile 2 is arranged on one side of the uplift pile 3, the top of the uplift pile 3 is connected with the fixed end of the variable thrust jack 10, one end of the counterforce beam 4 is connected with the ejection end of the variable thrust jack 10, the middle part of the counterforce beam 4 is flexibly connected with the top of the uplift pile 2, and the other end of the counterforce beam 4 is provided with a holding device 5 connected with the pile 1 to be pressed; the holding device 5 can ensure that the pile 1 to be pressed in does not move axially relative to the holding device 5 in the pile pressing process.
The counter-force beam 4 is equivalent to a lever, the uplift pile 2 is a fulcrum, the point of the variable thrust jack 10 acting on the counter-force beam 4 is a force application point, the point of the holding device 5 acting on the pile 1 to be pressed is a force bearing point, according to the lever principle, when the variable thrust jack 10 pushes one end of the counter-force beam 4 upwards, the other end of the counter-force beam 4 moves downwards, pressure is applied to the pile 1 to be pressed through the holding device 5, the thrust of the variable thrust jack 10 is gradually increased, the pile 1 to be pressed is finally pressed into a required force bearing layer, and at the moment, the bearing capacity of the pile 1 to be pressed meets the design requirement; in order to ensure the pile forming effect, the maximum thrust of the variable thrust jack 10 which is 1.1 to 1.3 times of the maximum thrust of the variable thrust jack 10 is generally taken as the final pile pressure.
The pile pressing device provided by the embodiment of the invention adopts a lever principle, the holding device 5 is arranged at the end part of the reaction beam 4, the requirement on the operation space is small, the pile pressing device is particularly suitable for side piles or corner piles close to the side wall 11 of a foundation pit, and the variable thrust jack 10 with a proper model can be selected according to the bearing capacity of the pile 1 to be pressed, the distance between the pile 1 to be pressed and the center of the uplift pile 2 and the distance between the center of the uplift pile 2 and the center of the compression-resistant pile 3.
The holding device 5 has various realizable structures, and the holding device 5 can be a manual pile gripper for example, and the pile gripper has the defects that a construction worker needs to manually adjust a clamping roller in the pile gripper on site to clamp the pile 1 to be pressed, so that the consumed working time is long, and the physical consumption of the construction worker is large; further by way of example, the holding device 5 may be a hydraulic pile gripper, which has the advantage that the constructor can press the pile 1 to be pressed tightly through the hydraulic control system, the consumed working hours are short, the physical consumption of the constructor is small, the constructor is far away from the pile 1 to be pressed, and the construction is safer.
For example, the distance between the center of pile to be driven 1 and the center of pile 2 may be greater than or equal to the distance between the center of pile 3 and the center of pile 2; the structure has the disadvantages that the thrust of the variable thrust jack 10 needs to be larger than or equal to the bearing capacity of the pile 1 to be pressed because the power arm is smaller than the resistance arm, the cost of the variable thrust jack 10 is higher, and the requirement on the compression resistance of the compression-resistant pile 3 is higher; as another example, referring to fig. 1, the distance between the center of pile to be driven 1 and the center of uplift pile 2 may be smaller than the distance between the center of uplift pile 3 and the center of uplift pile 2; the advantage of this structure is, because the power arm is greater than the resistance arm, consequently laborsaving, and the thrust of variable thrust jack 10 is less than the bearing capacity of the stake 1 of waiting to impress, and the rated thrust of variable thrust jack 10 can be some littleer, and the cost of variable thrust jack 10 is lower, and the compressive property requirement of compressive pile 3 is also lower.
Because the bearing capacity of each pile to be pressed 1 is different, if each pile to be pressed 1 is provided with a proper uplift pile 2 and a proper anti-pressure pile 3, and the uplift pile 2 and the anti-pressure pile 3 are both single piles, the cost is higher, so that the uplift pile 2 can be a single pile or a combined multi-pile, and the anti-pressure pile 3 can also be a single pile or a combined multi-pile; when the bearing capacity of the pile 1 to be pressed in can be met by the pressure or the pulling force borne by the single pile, the single pile can be selected; fig. 1 and 2 are schematic structural views of embodiment 1 of the present invention, in which uplift piles 2 and compression piles 3 are single piles, and piles 1 to be pressed are corner piles; when the pressure or pulling force borne by the single pile cannot meet the bearing capacity of the pile 1 to be pressed in, a plurality of single piles can be selected according to the requirement and assembled into a combined multi-pile; fig. 1 and 3 are schematic structural diagrams of an embodiment 2 of the present invention, in the embodiment 2, the uplift piles 2 and the compression-resistant piles 3 are combined multiple piles, and the piles 1 to be pressed into the pile with different bearing capacity requirements can be met only by adjusting the number of single piles in the uplift piles 2 or the compression-resistant piles 3, so that the application range is wider, and the cost is lower.
Referring to fig. 1, because the degree of difficulty of direct connection flexible connectors is great, the cost is higher on the pile body, consequently, uplift pile 2's top can the first force transmission component 7 of rigid connection, first force transmission component 7 passes through flexible connectors with reaction beam 4 and is connected, and like this, first force transmission component 7 is direct to be connected with flexible connectors to transmit the pulling force of reaction beam 4 for uplift pile 2, from this, need not be on the pile body direct connection flexible connectors, has reduced the preparation degree of difficulty and the cost of pile body. Specifically, uplift pile 2 can be reinforced concrete pile, also can be the piling bar, and the restriction is not done here, and when uplift pile 2 was the reinforced concrete pile, for the convenience of applying the pulling force, 2 tops of uplift pile reinforcing bar 6 expose, first power transmission member 7 is connected on reinforcing bar 6, flexible connectors connects on first power transmission member 7, first power transmission member 7 can be reinforced concrete member, also can be the steel member, because the steel member, intensity is big, and the dead weight is little, therefore preferred steel member.
The flexible connecting member has various realizable structures, for example, the flexible connecting member can be a hinge, and the structure has the defects that the hinge needs to be arranged between the reaction beam 4 and the first force transmission member 7 and the reaction beam 4 and the first force transmission member 7 are hinged, the cost is increased due to the need of arranging the hinge, and the reaction beam 4 has larger weight, so the installation is inconvenient; for another example, referring to fig. 4, the flexible connecting member may be a steel wire rope 8, and the structure has the advantages that only one end of the steel wire rope 8 needs to be connected to the first force transmission member 7, and the other end of the steel wire rope 8 is connected to the first force transmission member 7 after bypassing the counter-force beam 4, and therefore, a hinge is not needed, the cost is low, and the installation is more convenient. Therefore, it is preferred that the flexible connection is of a wire rope construction.
The flexible connecting piece can also be a steel wire, a steel sheet, a steel bar or a steel strand and the like, and the connecting mode of the flexible connecting piece is similar to that of a steel wire rope and can replace the steel wire rope.
The steel wire rope 8 has various fixing modes, for example, the steel wire rope 8 can be anchored on the first force transmission member 7, and the structure has the defects that the anchoring section of the steel wire rope 8 is positioned in the first force transmission member 7, so that the steel wire rope 8 cannot be replaced; as another example, referring to fig. 4, a pull ring 71 may be disposed on the first force transmission member 7, one end of the wire rope 8 is connected to the pull ring 71 through a first wire rope clip 12, and the other end of the wire rope 8 is connected to the pull ring 71 through a second wire rope clip 13, and the pull ring 71 is disposed on the surface of the first force transmission member 7, so that the wire rope 8 is convenient to install and replace.
Referring to fig. 1 to 3, because the top surface of compressive pile 3 is difficult to accomplish levelly and smoothly, variable thrust jack 10 is not well installed, especially when compressive pile 3 is hollow tubular pile, the top surface center of compressive pile 3 is empty, variable thrust jack 10 is more difficult to install, and because the atress is inhomogeneous, the pile top is destroyed easily, therefore, can set up second biography power component 9 at the top of compressive pile 3, second biography power component 9 is used for providing smooth installation face for variable thrust jack 10, be convenient for variable thrust jack 10's installation, and evenly transmit the pressure of variable thrust jack 10 for compressive pile 3, prevent compressive pile 3 from being damaged, can prolong the life of compressive pile 3.
The second force transfer member 9 may be a reinforced concrete member or a steel member, and is preferably a steel member because of its high strength and low self weight.
The counter-force beam 4 has various types which can be realized, for example, the counter-force beam 4 can be a reinforced concrete beam, and the reinforced concrete beam has the defects of large dead weight and inconvenient transportation; further, the reaction beam 4 may be a steel beam, which has the advantages of high rigidity, high strength, low self weight, and convenient transportation, and therefore, the reaction beam 4 is preferably a steel beam.
Referring to fig. 5, an embodiment of the present invention further provides a pile driving method using the pile driving device, including the following steps:
and calculating the quantity of the compression piles 3 and the quantity of the uplift piles 2, driving the compression piles 3 and the uplift piles 2 into a soil layer at the bottom of the foundation pit, starting the variable thrust jack 10, and gradually increasing the thrust of the variable thrust jack 10 until the variable thrust jack 10 reaches a set thrust value.
The method has no requirements on the position and the bearing capacity of the pile 1 to be pressed in, has wide application range, does not need to replace a large pile with a plurality of small piles, has simple process and low cost, and does not need to change the design scheme.
Specifically, the method for calculating the number of the compression piles and the uplift piles comprises the following steps:
according to the distance L between the center of the pile 1 to be pressed and the center of the uplift pile 21Distance L between center of uplift pile 2 and center of compression pile 32And design bearing capacity R1By the formula R2＝R1×(L1+L2)/L2Calculating the total pullout resistance R2(ii) a Then according to the total pulling resistance R2And the single-pile uplift bearing capacity R of the uplift pile 22 sheetBy the formula M ═ R2/R2 sheetCalculating the number M of the uplift piles, and if M is larger than 1, combining the M uplift piles 2 into a combined multi-pile;
according to the distance L between the center of the pile 1 to be pressed and the center of the uplift pile 21Distance L between center of uplift pile 2 and center of compression pile 32And design bearing capacity R1By the formula R3＝R1×L1/L2Calculating the maximum thrust R of the variable thrust jack 103(ii) a According to the maximum of the variable thrust jack 10Thrust force R3And the compressive bearing capacity R of the single pile of the compressive pile4 sheetBy the formula N ═ R3/R4 sheetAnd calculating the number N of the compressive piles 3, and if N is larger than 1, combining the N compressive piles 3 into a combined multi-pile.
Specifically, after the variable thrust jack 10 is started, the extending end of the variable thrust jack 10 generates an upward thrust on one end of the counter-force beam 4, and a downward pressure is generated on the pile 1 to be pressed according to the lever principle; the thrust of the variable thrust jack 10 is gradually increased, and the downward pressure generated on the pile 1 to be pressed is also increased until the designed bearing capacity R is reached1In order to ensure the piling effect, the variable thrust jack 10 is usually 1.1-1.3R3As the final pile pressure.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. A pile driving apparatus, comprising:
pile resistance;
the uplift pile is arranged on one side of the compression pile;
the variable thrust jack is arranged at the top of the compressive pile, and the fixed end of the variable thrust jack is connected to the top surface of the compressive pile;
one end of the counter-force beam is arranged above the extending end of the variable thrust jack, the middle of the counter-force beam is flexibly connected with the top of the uplift pile, and the other end of the counter-force beam is provided with a holding device which is used for being connected with the pile to be pressed;
and the direction of the tensile force transmitted by the counter-force beam born by the uplift pile is parallel to that of the compressive force transmitted by the counter-force beam born by the compression-resistant pile.
2. A pile driving device according to claim 1, characterised in that the clasping means is a hydraulic clasper.
3. The pile driving apparatus according to claim 1, wherein a distance between a center of the pile to be driven and a center of the uplift pile is smaller than a distance between the center of the uplift pile and the center of the uplift pile.
4. Pile-driving device according to claim 1, characterized in that the compression-resistant pile is a mono-pile or a combined multi-pile; the uplift pile is a single pile or a combined multiple pile.
5. Pile driving device according to claim 1,
the uplift pile further comprises a first force transmission member rigidly connected to the top of the uplift pile, and the first force transmission member is connected with the counter-force beam through a flexible connecting piece.
6. Pile driving device according to claim 5,
the flexible connecting piece is a steel wire rope, one end of the steel wire rope is connected to the first force transmission member, and the other end of the steel wire rope is connected to the first force transmission member after bypassing the counter-force beam.
7. Pile driving device according to claim 6,
the first force transmission component is provided with a pull ring, one end of the steel wire rope is connected to the pull ring through a first steel wire rope clamp, and the other end of the steel wire rope is connected to the pull ring through a second steel wire rope clamp.
8. A pile driving apparatus according to claim 1, wherein the compression resistant pile is connected to the variable thrust jack by a second force transfer member.
9. A pile driving method using the pile driving apparatus according to any one of claims 1 to 8, comprising the steps of,
calculating the number of the compression resistant piles and the uplift piles;
driving the compression resistant pile and the uplift pile into a soil layer at the bottom of the foundation pit;
and starting the variable thrust jack, and gradually increasing the thrust of the variable thrust jack until the variable thrust jack reaches a set thrust value.
10. Pile driving method of a pile driving device according to claim 9,
the method for calculating the number of the compression piles and the uplift piles comprises the following steps,
according to the distance L between the center of the pile to be pressed and the center of the uplift pile1Distance L between center of uplift pile and center of compression-resistant pile2And design bearing capacity R1By the formula R2＝R1×(L1+L2)/L2Calculating the total pullout resistance R2；
According to the total pull-out resistance R2And the single-pile uplift bearing capacity R2 of the uplift pileSheetBy the formula M ═ R2/R2SheetCalculating the number M of the uplift piles;
if M is larger than 1, combining M uplift piles into a combined multi-pile;
according to the distance L between the center of the pile to be pressed and the center of the uplift pile1Distance L between center of uplift pile and center of compression-resistant pile2And design bearing capacity R1By the formula R3＝R1×L1/L2Calculating the maximum thrust R of the variable thrust jack3；
According to the maximum thrust R of the variable thrust jack3And the single-pile compressive bearing capacity R of the compressive pile4 sheetBy the formula N ═ R3/R4 sheetCalculating the number N of the compression resistant piles;
and if N is larger than 1, combining N compressive piles into a combined multi-pile.
CN202010239669.1A 2020-03-30 2020-03-30 Pile pressing device and method Pending CN111287184A (en)

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Application Number Priority Date Filing Date Title
CN202010239669.1A CN111287184A (en) 2020-03-30 2020-03-30 Pile pressing device and method

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Application Number Priority Date Filing Date Title
CN202010239669.1A CN111287184A (en) 2020-03-30 2020-03-30 Pile pressing device and method

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111851516A (en) * 2020-06-20 2020-10-30 中铁上海工程局集团有限公司 PHC pipe pile reverse-sequence construction method suitable for complex environment
CN112962601A (en) * 2021-02-23 2021-06-15 四川省建研全固建筑新技术工程有限公司 Static pressure pile loading device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111851516A (en) * 2020-06-20 2020-10-30 中铁上海工程局集团有限公司 PHC pipe pile reverse-sequence construction method suitable for complex environment
CN112962601A (en) * 2021-02-23 2021-06-15 四川省建研全固建筑新技术工程有限公司 Static pressure pile loading device
CN112962601B (en) * 2021-02-23 2022-05-03 四川省建研全固建筑新技术工程有限公司 Static pressure pile loading device

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