Effective pile splicing construction method after DPS oblique square pile breaking

Abstract

The invention provides an effective pile splicing construction method after a DPS oblique square pile is broken, which comprises the following steps of: firstly, excavating to the pile breaking elevation when the oblique square pile is broken, flatly cutting an unbroken qualified section, then detecting the integrity and the bearing capacity of a pile body, and then manufacturing and welding a lengthened latticed column. Finally, the lengthened latticed columns are in socket connection with the broken piles and are connected with surrounding purlins at the tops of the fender posts; wherein the lengthened latticed column main body is formed by welding four pieces of equilateral angle steel and a plurality of steel batten plates, the bottom of the lengthened latticed column main body is welded with a steel plate for sealing the bottom, and a steel external member is welded below the steel plate for sealing the bottom and is used for being in socket connection with a broken pile. By means of the method, broken piles can be effectively remedied, square piles are prevented from being complementarily driven, and the method has important engineering significance in reducing secondary disturbance to the stratum and saving the construction period and unnecessary expenditure.

Description

Technical Field

[0001] This invention belongs to the field of building construction technology, and in particular relates to an effective method for splicing DPS inclined piles after pile breakage. Background Technology

[0002] Currently, a new type of foundation pit support is widely used: the combination of inclined piles and the SMW (Small Sandwich Wrap) method. During the construction of inclined piles, issues such as pile group displacement, discrepancies between the geological conditions and the survey, and improper construction pressure can lead to pile breakage before the pile tip reaches the design elevation. Past experience has shown that after pile breakage, the design team recalculates and re-drives inclined piles. However, this can cause further disturbance to the soil, increasing construction time and costs. To address these problems, this invention proposes an effective splicing method for broken DPS (Digital Pile Stress) inclined piles. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an effective method for splicing broken DPS inclined piles, which solves the defects in existing methods for re-driving broken inclined piles and addresses the issues of increased construction time and costs caused by broken piles.

[0004] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0005] A method for effectively splicing broken DPS inclined piles includes the following steps: Step 1: When a slanted pile breaks, excavate to the breakage elevation and cut the unbroken, qualified section flat. Step 2: After cutting and leveling, conduct tests on the integrity and bearing capacity of the pile body; Step 3: Fabricate and weld the extended lattice columns; Step 4: Connect the lower part of the extended lattice column to the broken pile with the socket, and connect the upper part to the top waler of the retaining pile.

[0006] Further, step 1 includes: after the inclined pile breaks, excavating downwards along the pile position and inclination angle to 0.5m below the broken pile position, using a hydraulic cutter to cut at the unbroken qualified cross-section, and ensuring that the cut cross-section is perpendicular to the axis of the inclined pile.

[0007] Further, step 3 includes: using four equilateral angle steels, with adjacent equilateral angle steels welded together by steel gusset plates to form an extended lattice column; wherein, the extended lattice column is evenly spaced with multiple layers of steel gusset plates from top to bottom, a bottom sealing steel plate is welded to the bottom of the extended lattice column for sealing, and a steel fitting is welded below the bottom sealing steel plate for connection with the broken pile socket, and the internal dimension of the steel fitting is 10mm larger than the cross-sectional dimension of the broken pile; and an additional steel connecting plate is added to the short side of the top of the extended lattice column for subsequent concrete construction.

[0008] Furthermore, the cross-sectional dimensions of the equilateral angle steel are 125×125×12mm, the dimensions of the steel gusset plate extending the short side of the lattice column are 310×150×10mm, and the dimensions of the steel gusset plate extending the long side of the lattice column are 410×150×10mm.

[0009] Furthermore, the steel gusset plates of adjacent upper and lower layers are spaced 200mm apart.

[0010] Furthermore, the bottom sealing steel plate has dimensions of 380×480×10mm; the short side steel plate of the steel kit has dimensions of 360×300×10mm, and the long side steel plate of the steel kit has dimensions of 480×300×10mm.

[0011] The dimensions of the steel connecting plate are 330×430×5mm.

[0012] Further, step 4 includes: inserting the steel fitting into the head of the broken pile according to the axial angle direction of the inclined pile, extending the lattice column, with the top of the extended lattice column extending into the top waler of the construction pile, and filling the triangular cavity formed by the bottom of the waler and the extended lattice column with concrete of the same strength grade as the waler.

[0013] The present invention has the following beneficial effects: The method described in this invention first involves excavating to the broken pile elevation when a concrete square pile breaks, and then cutting and smoothing the unbroken, qualified cross-section. Next, after smoothing, the integrity and bearing capacity of the pile body are tested. Then, an extended steel lattice column is fabricated and welded. Finally, the extended lattice column is connected to the broken pile via a socket joint and then to the top waler of the precast pile. When a precast pile breaks, traditional remedial measures typically involve driving a new square pile. However, under the control of the construction method and steps of this invention, the broken pile can be effectively remedied, avoiding the need to drive a new square pile. This has significant engineering implications for reducing further disturbance to the strata and saving construction time and unnecessary expenses. It effectively solves the defects of existing methods for re-driving broken inclined square piles and addresses the problems of increased construction time and costs caused by broken piles. Attached Figure Description

[0014] Figure 1 Schematic diagram of the short side elevation of the extended lattice column; Figure 2 Schematic diagram of the elevation of the extended lattice column; Figure 3 This is a schematic diagram of the splicing connection between the extended lattice column and the broken pile.

[0015] In the diagram: 1-Extended lattice column; 2-Steel gusset plate; 3-Bottom sealing steel plate; 4-Steel fitting; 5-Walter; 6-Broken pile; 7-Equal angle steel; 8-Steel connecting plate; Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0017] The effective splicing method for DPS inclined piles after pile breakage described in this invention includes the following process: Step 1: When a slanted pile breaks, excavate to the breakage elevation and cut the unbroken, qualified section flat. After the inclined pile breaks, excavate quickly downwards along the pile location and inclination angle to 0.5m below the broken pile location. Use a hydraulic cutter to cut the unbroken, qualified section, with the cut section perpendicular to the axis of the inclined pile.

[0018] Step 2: After cutting and leveling, conduct tests on the integrity and bearing capacity of the pile body; The prerequisite for splicing a broken inclined pile is that the integrity and bearing capacity of the portion of the pile that has entered the soil meet the design requirements. Therefore, before splicing, the cut pile body must be tested for high and low strain, and subsequent construction can only proceed after it passes the tests.

[0019] Step 3: Fabricate and weld the extended lattice column 1; like Figure 1 , 2 As shown, four equilateral angle steels 7 with a cross-sectional dimension of 125×125×12mm are used. Adjacent equilateral angle steels 7 are welded together by steel gusset plates 2 to form the extended lattice column 1. The extended lattice column 1 has multiple layers of steel gusset plates from top to bottom, with a 200mm interval between adjacent layers. The dimensions of the steel gusset plates 2 on the short side of the extended lattice column 1 are 310×150×10mm, and the dimensions of the steel gusset plates 2 on the long side are 410×150×10mm. The bottom of the extended lattice column 1 is sealed with a bottom-sealing steel plate 3 with dimensions of 380×480×10mm, and a steel fitting 4 is welded below the bottom-sealing steel plate 3 to connect with the broken pile 6. The steel fitting 4 has a short side steel plate size of 360×300×10mm and a long side steel plate size of 480×300×10mm. The long side is used as the welding template. The inner diameter of the steel fitting 4 is slightly larger than the cross-sectional size of the broken pile 6 by 10mm. In addition, an extra steel connecting plate 8 (330×430×5mm) is added to the short side of the top of the extended lattice column 1 for subsequent concrete construction. All the above welding construction is full welding, and the weld height is greater than 8mm.

[0020] Step 4: Connect the extended lattice column 1 to the broken pile 6 via a socket joint and connect it to the top waler 5 of the retaining pile; like Figure 3 As shown, the steel fitting 4 is inserted into the head of the broken pile 6 according to the axial angle direction of the inclined pile 1. The top of the extended lattice column 1 extends into the top waler 5 of the construction pile. The triangular cavity formed by the bottom of the waler 5 and the extended lattice column 1 is filled with concrete of the same strength grade as the waler 5.

[0021] The embodiments described above are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for effectively splicing broken DPS inclined piles, characterized in that, The process includes the following: Step 1: When a slanted pile breaks, excavate to the breakage elevation and cut the unbroken, qualified section flat. Step 2: After cutting and leveling, conduct tests on the integrity and bearing capacity of the pile body; Step 3: Fabricate and weld the extended lattice column (1); Step 4: The lower part of the extended lattice column (1) is connected to the broken pile (6) by a socket joint, and the upper part is connected to the top waler (5) of the retaining pile.

2. The method for effective splicing of DPS inclined piles after pile breakage according to claim 1, characterized in that, Step 1 includes: after the inclined pile breaks, excavating downwards along the pile position and inclination angle to 0.5m below the broken pile position, using a hydraulic cutter to cut at the unbroken qualified section, and ensuring that the cut section is perpendicular to the axis of the inclined pile.

3. The method for effective splicing of DPS inclined piles after pile breakage according to claim 1, characterized in that, Step 3 includes: using four equilateral angle steels (7), adjacent equilateral angle steels (7) are welded together by steel gusset plates (2) to form an extended lattice column (1); wherein, the extended lattice column (1) is evenly provided with multiple layers of steel gusset plates from top to bottom, the bottom of the extended lattice column (1) is sealed with a bottom sealing steel plate (3), and a steel fitting (4) is welded below the bottom sealing steel plate (3) for socket connection with the broken pile (6), and the internal size of the steel fitting (4) is 10mm larger than the cross-sectional size of the broken pile (6); and an additional steel connecting plate (8) is added to the short side of the top of the extended lattice column (1) for subsequent concrete construction.

4. The method for effective splicing of DPS inclined piles after pile breakage according to claim 3, characterized in that, The cross-sectional dimensions of the equilateral angle steel (7) are 125×125×12mm. The dimensions of the steel gusset plate (2) that extends the short side of the lattice column (1) are 310×150×10mm, and the dimensions of the steel gusset plate (2) that extends the long side of the lattice column (1) are 410×150×10mm.

5. The method for effective splicing of DPS inclined piles after pile breakage according to claim 3, characterized in that, The steel gusset plates (2) of the upper and lower adjacent layers are spaced 200mm apart.

6. The method for effective splicing of DPS inclined piles after pile breakage according to claim 3, characterized in that, The bottom sealing steel plate (3) has a size of 380×480×10mm; the short side steel plate of the steel kit (4) has a size of 360×300×10mm, and the long side steel plate of the steel kit (4) has a size of 480×300×10mm.

7. The method for effective splicing of DPS inclined piles after pile breakage according to claim 3, characterized in that, The steel connecting plate (8) has dimensions of 330×430×5mm.

8. The method for effective splicing of DPS inclined piles after pile breakage according to claim 3, characterized in that, Step 4 includes: extending the lattice column (1) by inserting the steel fitting (4) into the head of the broken pile (6) according to the axial angle direction of the inclined pile; extending the top of the lattice column (1) into the top waler (5) of the construction pile; and filling the triangular cavity formed by the bottom of the waler (5) and the extended lattice column (1) with concrete of the same strength grade as the waler (5).

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