CN111305188A

CN111305188A - Construction method for accurately guiding pile sinking in soft soil area

Info

Publication number: CN111305188A
Application number: CN201911188398.5A
Authority: CN
Inventors: 郭志辉; 朱奇; 肖强; 管安康; 谢慕华; 别业环
Original assignee: China First Metallurgical Group Co Ltd
Current assignee: China First Metallurgical Group Co Ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-06-19

Abstract

The invention relates to a construction method for accurately guiding a pile into a sunk pile in a soft soil area. According to the construction method provided by the invention, the supporting beam forming an included angle of 45 degrees with the guide beam is utilized to effectively support the guide beam so as to ensure the stability of the guide beam in the axial direction and prevent the guide beam from deviating; simultaneously, the cooperation is inserted and is beaten the in-process detachable spacing shaped steel of installing between the guide beam to ensure that the design elevation of steel sheet pile does not change, thereby effectively improve the qualification rate and the pile sinking efficiency of steel sheet pile sinking, guarantee the steadiness of connecting between the steel sheet pile in bank, reduce the influence to peripheral structure building.

Description

Construction method for accurately guiding pile sinking in soft soil area

Technical Field

The invention relates to the technical field of building construction, in particular to a construction method for accurately guiding in a pile sinking in a soft soil area.

Background

At present, in the conventional piling process of Larsen steel sheet piles, because the action position of the striking force of a piling hammer and the action position of the joint friction force generated between the driven steel sheet piles are separated from each other, couple force is easily generated between the two action forces, the steel sheet piles are easily inclined towards the direction of a central line by the couple force, the phenomena that a guide frame and a designed axis are in and out generated, the guide frame is loosened in the inserting and beating construction of the steel sheet piles and the like are generated, finally, the problems that deviation is generated, the guide frame needs to be moved for many times in the inserting and beating process of the steel sheet piles and the like are caused, and therefore deviation is generated between the accident and the designed axis.

Disclosure of Invention

Aiming at the problems, the construction method for accurately guiding the pile sinking in the soft soil area is provided, and aims to effectively solve the problems of axial line position deviation, pile top elevation deviation and the like easily occurring in the inserting and driving process of the steel sheet pile.

The specific technical scheme is as follows:

a construction method for accurately guiding pile sinking in a soft soil area is characterized by comprising the following steps:

selecting a steel pipe pile and I-steel with proper length according to the width and the driving depth of a foundation pit in a soft soil area;

step two, I-shaped steel is driven into the upper side and the lower side of the foundation pit to serve as guide beams, steel pipe piles are driven into the outer sides of the guide beams, which are opposite to the foundation pit, at intervals along the length direction of the guide beams, and supporting beams are welded between the steel pipe piles and the guide beams to effectively support the guide beams;

fastening the limiting section steel between the upper and lower guide beams by using fastening bolts, inserting Larsen steel sheet piles into the inserting and driving areas defined by the limiting section steel and the upper and lower guide beams until the limiting section steel reaches a specified elevation, removing the limiting section steel, and continuously inserting and driving until the limiting section steel reaches the designed elevation;

fastening limiting section steel between the upper and lower guide beams at the right side of the Larsen steel sheet pile inserted and driven into the foundation pit, connecting the lock catch of the other Larsen steel sheet pile with the lock catch of the previous Larsen steel sheet pile, inserting and driving the Larsen steel sheet pile into an insertion and driving area limited by the upper and lower guide beams, the limiting section steel and the previous Larsen steel sheet pile until the Larsen steel sheet pile reaches a specified elevation, removing the limiting section steel, and continuously inserting and driving until the limiting section steel reaches a designed elevation;

and step five, repeating the step four until pile sinking is finished.

The construction method also has the characteristic that the clear distance between the upper and lower side guide beams in the step two is 8-10mm larger than the width of the Larsen steel sheet pile.

The construction method described above is further characterized in that the distance between adjacent steel pipe piles in the second step is 5 to 6 m.

The construction method also has the characteristic that in the second step, the included angle between the supporting beam and the guide beam is 45 degrees.

The beneficial effect of above-mentioned scheme is:

according to the construction method provided by the invention, the supporting beam forming an included angle of 45 degrees with the guide beam is utilized to effectively support the guide beam so as to ensure the stability of the guide beam in the axial direction and prevent the guide beam from deviating; simultaneously, the cooperation is inserted and is beaten the in-process detachable spacing shaped steel of installing between the guide beam to ensure that the design elevation of steel sheet pile does not change, thereby effectively improve the qualification rate and the pile sinking efficiency of steel sheet pile sinking, guarantee the steadiness of connecting between the steel sheet pile in rows.

Drawings

Fig. 1 is a schematic view of a pile sinking structure provided in an embodiment of the present invention;

fig. 2 is a schematic diagram of a post-pile-sinking structure provided in an embodiment of the present invention.

In the drawings: 1. steel pipe piles; 2. i-shaped steel; 3. a support beam; 4. limiting section steel; 5. larsen steel sheet pile.

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.

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

As shown in fig. 1 and 2, a construction method provided in an embodiment of the present invention includes the steps of:

step one, selecting a steel pipe pile 1 and an I-steel 2 with proper lengths according to the width and the driving depth of a foundation pit in a soft soil area;

step two, I-shaped steel 2 is driven into the upper side and the lower side of the foundation pit to serve as guide beams, 1 steel pipe pile 1 is driven into the outer side of each guide beam, which is opposite to the foundation pit, at intervals of 5m along the length direction of each guide beam, and a support beam 3 is welded between each steel pipe pile 1 and each guide beam;

fastening the limiting section steel 4 between the upper and lower guide beams by using fastening bolts, inserting and driving the Larsen steel sheet pile 5 into an inserting and driving area defined by the limiting section steel 4 and the upper and lower guide beams until the limiting section steel reaches a specified elevation, removing the limiting section steel 4, and continuously inserting and driving until the limiting section steel reaches the designed elevation;

fastening the limiting section steel 4 between the upper and lower guide beams at the right side of the Larsen steel plate pile 5 inserted and driven into the foundation pit, connecting the lock catch of the other Larsen steel plate pile 5 with the lock catch of the previous Larsen steel plate pile 5, inserting and driving the Larsen steel plate pile 5 into an insertion and driving area limited by the upper and lower guide beams, the limiting section steel 4 and the previous Larsen steel plate pile 5 until the position reaches a specified elevation, removing the limiting section steel 4, and continuing inserting and driving until the position reaches the designed elevation;

and step five, repeating the step four until pile sinking is finished.

The included angle between the supporting beam 3 and the guide beam is 45 degrees, so that the guide beam can provide enough support, and the guide beam can be prevented from being deviated and loosened in the subsequent steel sheet pile inserting and driving process, and the stability of the guide beam in the axial direction and the qualification rate in the subsequent steel sheet pile inserting and driving process can be ensured.

According to the invention, when the Larsen steel sheet pile is inserted and driven, the guide beams effectively supported by the steel pipe pile 1 at two sides and the detachable limiting section steel 4 arranged between the guide beams are used for limiting to obtain an insertion and driving area with a clear distance slightly larger than the width of the Larsen steel sheet pile 5, so that the inclination of the steel sheet pile in the pile driving process is prevented, the qualification rate and the pile driving efficiency in the insertion and driving process are ensured, and the connection stability between the steel sheet piles in rows after the subsequent pile driving is finished is ensured.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.

Claims

1. A construction method for accurately guiding pile sinking in a soft soil area is characterized by comprising the following steps:

step one, selecting a steel pipe pile (1) and I-steel (2) with proper lengths according to the width and the driving depth of a foundation pit in a soft soil area;

step two, I-shaped steel (2) is driven into the upper side and the lower side of the foundation pit to serve as guide beams, steel pipe piles (1) are driven into the outer sides of the guide beams, which are opposite to the foundation pit, at intervals along the length direction of the guide beams, and then supporting beams (3) are welded between the steel pipe piles (1) and the guide beams;

fastening the limiting section steel (4) between the upper and lower guide beams by using fastening bolts, then inserting and driving Larsen steel sheet piles (5) into inserting and driving areas limited by the limiting section steel (4) and the upper and lower guide beams until the inserting and driving areas reach a specified elevation, dismantling the limiting section steel (4), and continuing inserting and driving until the inserting and driving areas reach the designed elevation;

fastening the limiting section steel (4) between the upper and lower guide beams at the right side of the Larsen steel plate pile (5) inserted and driven into the foundation pit, connecting the lock catch of the other Larsen steel plate pile (5) with the lock catch of the previous Larsen steel plate pile (5), inserting and driving the Larsen steel plate pile (5) into the inserting and driving area limited by the upper and lower guide beams, the limiting section steel (4) and the previous Larsen steel plate pile (5) until the position reaches a standard height, removing the limiting section steel (4), and continuously inserting and driving until the position reaches the designed height;

and step five, repeating the step four until pile sinking is finished.

2. The construction method according to claim 1, wherein the clear distance between the upper and lower side guide beams in the second step is 8-10mm larger than the width of the Larsen steel sheet pile (5).

3. The construction method according to claim 1, wherein the interval between adjacent steel pipe piles (1) in the second step is 5-6 m.

4. A method according to claim 1, wherein in step two the angle between the support beam (3) and the guide beam is 45 °.