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CN-121976519-A - Novel steel sheet pile, supporting structure and construction method for compensating stratum loss during pile pulling

CN121976519ACN 121976519 ACN121976519 ACN 121976519ACN-121976519-A

Abstract

The invention discloses a novel steel sheet pile, a supporting structure and a construction method for compensating stratum loss during pile pulling, and belongs to the technical field of supporting construction. The novel steel sheet pile comprises a steel sheet pile main body and connecting structures at two ends of the steel sheet pile main body, wherein at least one grouting channel is arranged on the steel sheet pile main body, the grouting channel vertically penetrates through the steel sheet pile main body downwards, a plugging cone cap is arranged at the lower end of the grouting channel, the bottom of the plugging cone cap is a tip, and the plugging cone cap can fall off from the grouting channel. The method comprises the steps of connecting a grouting opening at the top end of a grouting channel with a grouting pump through a grouting pipeline, pulling out a novel steel sheet pile for a certain length, starting the grouting pump and pressurizing to be greater than or equal to grouting pressure P, enabling a plugging cone cap to fall off under the action of the pressure, continuing pile pulling, and continuously grouting into a hole formed by pile pulling through the grouting pump while pile pulling, so that soil after pile pulling is reinforced. The novel steel sheet pile can effectively avoid the hole collapse problem caused by pile pulling of the steel sheet pile, and avoid ground cracking and loosening.

Inventors

  • HE DA
  • XU JINXING
  • ZHOU ZIYANG
  • YANG CHAO
  • YANG HENG
  • WANG MINMIN

Assignees

  • 湖北省电力规划设计研究院有限公司

Dates

Publication Date
20260505
Application Date
20260209

Claims (10)

  1. 1. The novel steel sheet pile comprises a steel sheet pile main body (1) and connecting structures at two ends of the steel sheet pile main body, wherein the connecting structures at two ends are mutually matched, and the novel steel sheet pile is characterized in that at least one grouting channel (4) is arranged on the steel sheet pile main body (1), the grouting channel (4) vertically penetrates through the steel sheet pile main body (1) downwards, a plugging cone cap (5) is detachably arranged at the lower end of the grouting channel, the bottom of the plugging cone cap (5) is a pointed end and can fall off from the grouting channel (4), and when a pile is pulled out, the plugging cone cap (5) falls off from the grouting channel (4) when slurry with a certain length and a certain pressure is introduced into the grouting channel (4) is pulled out from the novel steel sheet pile.
  2. 2. The novel steel sheet pile according to claim 1, wherein the connection structures at two ends of the steel sheet pile main body (1) are respectively a male connector (2) and a female connector (3), the steel sheet pile main body (1) is of a U-shaped structure and comprises a middle web plate and two wing plates at two ends of the middle web plate, the middle web plate protrudes inwards or protrudes outwards, one end, away from each other, of each wing plate is respectively provided with the male connector (2) and the female connector (3), two adjacent novel steel sheet piles are connected with each other in a meshed mode through the male connector (2) and the female connector (3), the grouting channels (4) are arranged on a middle web plate side by side in the width direction and are uniformly distributed, and the grouting channel (4) is arranged in the middle of the middle web plate.
  3. 3. A new steel sheet pile according to claim 2, characterized in that the number of grouting channels (4) is one, which is a round tube structure, the two sides of which protrude respectively into the inner and outer sides of the middle web to form two semicircular protrusions.
  4. 4. The novel steel sheet pile according to claim 3, wherein the plugging cone cap (5) is of a metal cylindrical structure and is vertically arranged, the plugging cone cap is sequentially provided with a conical part, a limiting part and an inserting part from bottom to top, the conical part, the limiting part and the inserting part are coaxially arranged, the conical part is a cone with the lower part being small and the upper part being large, the limiting part and the inserting part are of cylindrical structures, the diameter of the limiting part is equal to the diameter of the top of the conical part and is larger than the inner diameter of the grouting channel (4), the inserting part is inserted into the inner lower end of the grouting channel (4) and is in clearance fit or tight fit with the grouting channel (4), and the top of the limiting part is propped against the bottom of the grouting channel (4).
  5. 5. The novel steel sheet pile according to claim 1, characterized in that the grouting channel (4) is formed integrally with the steel sheet pile body (1) and has an inner diameter of 3cm or more and a grouting opening matched with a grouting pipeline at the top end.
  6. 6. A supporting structure comprising a plurality of novel steel sheet piles according to any one of claims 1 to 5, wherein two adjacent novel steel sheet piles are connected and reversely arranged by a connecting structure.
  7. 7. Construction method for compensating for stratum losses during pile extraction, characterized in that a new steel sheet pile according to any one of claims 1-5 is used, which method comprises: S1, calculating grouting pressure P and grouting quantity W for each parameter of the grouting pressure P and grouting quantity W obtained through detection and/or inquiry modes; s2, connecting a grouting port at the top end of a grouting channel (4) with a grouting pump through a grouting pipeline; S3, pulling out the novel steel sheet pile by a certain length M; S3, starting a grouting pump, pressurizing to be more than or equal to grouting pressure P, and enabling the plugging cone cap (5) to fall off under the action of pressure; and S4, continuing pile pulling, and simultaneously, continuously grouting into a hole formed by pile pulling through a grouting pump, stopping pile pulling and maintaining when the bottom end of the novel steel sheet pile reaches the top of the hole, and completely pulling out the novel steel sheet pile until the grouting amount W is reached, so as to reinforce the soil body after pile pulling.
  8. 8. The method of claim 7, wherein the grouting pressure P is calculated as: P=max{P 1 ,P 2 }; wherein: F 1 is the minimum pulling force required by falling between the plugging cone cap (5) and the grouting channel (4), kN is the unit, d is the inner diameter of the grouting channel (4), and m is the unit; the position is kPa, gamma is the specific gravity of slurry, L 1 is the length of a novel steel sheet pile, the unit is m, L 2 is the length of a grouting pipeline between a grouting pump and a grouting port of the novel steel sheet pile, i is the pressure loss of the slurry in the pipeline, the unit is kPa/m, k is a correction coefficient, k=1.1-1.5, P 3 is the pressure loss of a slurry pump and a slurry suction pipeline, the unit is kPa, P 1 =(20-40)γkPa;P 4 is safe pressure, and the unit is kPa, and P 2 = (30-50) gamma kPa.
  9. 9. The method according to claim 7, wherein the calculation formula of the grouting amount W is: ; Wherein A 1 is the cross-sectional area of the novel steel sheet pile, the unit is m 2 , D is the maximum width of the cross-section of the novel steel sheet pile, the unit is m, phi is the porosity of soil around the novel steel sheet pile, B is the diffusion coefficient, and B=0.2-0.4.
  10. 10. The method according to claim 9, wherein step S1 comprises: measuring the length N of the plugging part of the plugging cone cap (5), wherein M is more than N; detecting or obtaining the minimum pulling force F 1 required by falling between the plugging cone cap (5) and the grouting channel (4) in a query mode; detecting or obtaining the porosity phi of the soil body in a query mode; The method comprises the steps of detecting the inner diameter D of a grouting channel (4), the length L 1 of the novel steel sheet pile, the cross-sectional area A 1 of the novel steel sheet pile and the maximum cross-sectional width D of the novel steel sheet pile; Detecting the length L 2 of a grouting pipeline between a grouting pump and a grouting port of the novel steel sheet pile, and if L 2 is not detected, calculating by L 2 =（1.3-1.5）L 1 ; the specific gravity gamma of the slurry is obtained by inquiry, and the pressure loss i of the slurry in the pipeline per unit length is obtained.

Description

Novel steel sheet pile, supporting structure and construction method for compensating stratum loss during pile pulling Technical Field The invention belongs to the technical field of supporting construction, and particularly relates to a novel steel sheet pile, a supporting structure and a construction method for compensating stratum loss during pile pulling. Background The steel sheet pile is a supporting pile form commonly used in the fields of houses and municipal engineering, and is convenient to construct, can be recycled, has high construction speed and good economic benefit, and is widely applied. However, there is a problem in the application process of the steel sheet pile, the steel sheet pile is usually recycled after pile pulling after use, a hole is formed after pile pulling, if the steel sheet pile is in a soft foundation or a sandy foundation, the hole is easy to collapse, and the ground is cracked and loosened, so that the engineering quality is affected. In order to avoid ground cracking and loosening caused by hole collapse, grouting or sand filling is generally performed from holes after pile pulling of the steel sheet piles is completed, so that engineering quality is guaranteed, but on soft foundations and sandy foundations, grouting or sand filling is often not performed, hole collapse is formed, and the effect of sand filling or sand filling is also greatly reduced. The patent with the application number of CN202511507134.7 discloses a steel sheet pile for compensating stratum loss during pile pulling, which comprises a plurality of steel sheet pile units supported by a foundation pit, wherein each steel sheet pile unit comprises a plurality of steel sheet piles, the foundation pit side of each steel sheet pile unit is connected with a plurality of compensation bags, the foundation pit side of each compensation bag is provided with a grouting system, the foundation pit side of each steel sheet pile is coated with viscous grease, the compensation bags are coated with pressure-sensitive adhesive towards one side of each steel sheet pile, one side of each compensation bag coated with pressure-sensitive adhesive is attached to the foundation pit side of each steel sheet pile and temporarily connected, each grouting system comprises a main grouting pipe, the bottoms of the main grouting pipes are connected with horizontal grouting pipes, the horizontal grouting pipes are connected with a plurality of shunt pipes towards one side of each steel sheet pile, the positions and the number of the shunt pipes correspond to the compensation bags, the middle positions of the shunt pipes are upwards distributed into vertical branch pipes, the vertical branch pipes are connected with grouting interfaces at the bottom ends of the corresponding compensation bags, the shunt pipes are downwards distributed into inclined grouting pipes, and the inclined grouting pipes face the lower sides of the steel piles. The construction process comprises the specific steps of piling and excavating a foundation pit, constructing a bottom plate, reserving supporting steel bars, connecting the vertical steel plates and the horizontal steel plates, coating viscous grease on the foundation pit sides of all steel plates, pasting a compensating bag pre-coated with pressure-sensitive adhesive on the surface of the steel plates, fixing the bottom of a main grouting pipe with the vertical steel plates or the horizontal steel plates, connecting a vertical branch pipe with a grouting interface of the compensating bag, extending the inclined grouting pipeline to a dead zone of the steel plates below the bottom plate, backfilling gaps between the bottom plate and the steel plates, constructing the main structure and a backfilling fertilizer groove, enabling a grout outlet of a threaded hose to face a shunt pipe of the steel plates to be pulled, enabling the threaded hose to be communicated with the corresponding shunt pipe, enabling grout to flow downwards into the inclined grouting pipeline when the steel plates are pulled out, filling gaps which cannot be covered by the steel plates, enabling the grout to flow into the compensating bag through the vertical branch pipe when the steel plates are pulled out to the bottom plate, enabling the compensating bag to expand to fill the gaps above the bottom plate, removing the compensating bag to fill the steel plates, and closing a repairing system after the whole grouting system is removed, and trimming all the compensating bags. The steel sheet pile can compensate stratum loss during pile pulling, but has the defects of complex structure, high cost, inconvenience in transportation, inconvenience in installation, inconvenience in operation and the like. Disclosure of Invention In order to solve the problems, the embodiment of the invention provides a novel steel sheet pile, a supporting structure and a construction method for compensating stratum loss during pile pulling. The technical s