Steel casing low-resistance connecting structure in full casing follow-up grouting pile construction

Abstract

The utility model discloses a steel casing low resistance connecting structure in full casing follow-up grouting pile construction, which comprises a plurality of steel casing bodies, the outer side wall of one end of each steel casing body is provided with an outer adaptive groove along the circumferential direction and forms an inner adaptive ring, and the inner side wall of the other end of each steel casing body is provided with an inner adaptive groove along the circumferential direction and forms an outer adaptive ring. The outer adaptive ring of one steel casing body is inserted into the outer adaptive groove of the adjacent steel casing body; the inner adaptive ring and the outer adaptive ring which are connected in an inserted mode are detachably connected through connecting pieces arranged at intervals in the circumferential direction. The construction method has the effects of reducing the pull-out resistance of the steel casing and improving the construction efficiency.

Description

Technical Field

[0001] The utility model relates to the field of steel casing construction, in particular to a low-resistance connection structure of a steel casing in the construction of a full-casing follow-up grouting pile. Background Art

[0002] At present, during the construction of drilling some relatively soft geological formations, in order to prevent the occurrence of hole wall collapse, the construction method of full-casing follow-up grouting pile is adopted, and the steel casing is used as a temporary support structure for drilling throughout the process; the steel casing is pulled out after the concrete initial sets, so the smoothness of pulling out the steel casing affects the entire construction efficiency.

[0003] The existing steel casings are divided into multiple sections for lowering, and the adjacent two sections of steel casings are connected by means of flange connection. However, in the subsequent process of pulling out the steel casing, there is a large resistance at the connection, making it difficult to pull out and affecting the construction efficiency. Summary of the Utility Model

[0004] In order to reduce the resistance of pulling out the steel casing and improve the construction efficiency, the present application provides a low-resistance connection structure of a steel casing in the construction of a full-casing follow-up grouting pile.

[0005] A low-resistance connection structure of a steel casing in the construction of a full-casing follow-up grouting pile provided by the present application adopts the following technical solutions:

[0006] A low-resistance connection structure of a steel casing in the construction of a full-casing follow-up grouting pile includes a plurality of steel casing bodies. An outer adaption groove is circumferentially formed on the outer side wall of one end of the steel casing body to form an inner adaption ring, and an inner adaption groove is circumferentially formed on the inner side wall of the other end to form an outer adaption ring. The outer adaption ring of one steel casing body is inserted into the outer adaption groove of the adjacent steel casing body; the mutually inserted inner adaption ring and outer adaption ring are detachably connected by circumferentially spaced connecting members.

[0007] By adopting the above technical solutions, when installing two adjacent steel casing bodies, the outer adaption ring is inserted into the outer adaption groove to achieve initial positioning, and the outer side wall and the inner side wall of the spliced steel casing are made flush; then the outer adaption ring and the inner adaption ring are connected by circumferentially spaced connecting members; the entire structure greatly reduces the area of the steel casing protruding from the surface, thus reducing the structure generating resistance, improving the smoothness of pulling out the steel casing subsequently, and further improving the construction efficiency.

[0008] Preferably, the connecting member includes a bolt. The inner adaption ring and the outer adaption ring are both circumferentially provided with threaded holes at intervals. The threaded holes of the inner adaption ring and the threaded holes of the outer adaption ring are arranged in one-to-one correspondence, and the bolt is simultaneously threadedly installed in the threaded hole of the inner adaption ring and the corresponding threaded hole of the outer adaption ring.

[0009] By adopting the above technical solution, the bolt is synchronously threadedly installed in the threaded holes on the corresponding inner adapter ring and outer adapter ring, achieving the connection and locking of adjacent steel casing tubes; this connection structure is simple and the installation is stable.

[0010] Preferably, the bolt includes a screw rod and a screwing head. The screw rod is threadedly installed in the threaded hole, and the screwing head is fixedly installed at the outer end of the screw rod. The cross-section of the screwing head is semi-elliptical.

[0011] By adopting the above technical solution, since the cross-section of the screwing head is semi-elliptical, the resistance is further reduced, and it can be more smooth when pulling out the steel casing tube.

[0012] Preferably, the screwing head covers the connection seam located outside between the adjacent steel casing tube bodies.

[0013] By adopting the above technical solution, the radial strength at the connection of two adjacent steel casing tube bodies can be improved, and thus the overall strength is enhanced.

[0014] Preferably, the end of the screw rod facing the inside of the steel casing tube body is flush with the inner side wall of the steel casing tube body.

[0015] By adopting the above technical solution, the flatness of the inner surface of the steel casing tube body is ensured, and the structure generating resistance is reduced.

[0016] Preferably, on one side of the inner adapter ring corresponding to the outer adapter groove, limiting strips are arranged at intervals along the circumferential direction. Limiting grooves are opened at the positions of the outer adapter ring corresponding to the limiting strips, and the limiting strips are inserted into the outer adapter ring through the limiting grooves.

[0017] By adopting the above technical solution, during the process of inserting the outer adapter ring into the outer adapter groove, when the limiting strip is inserted into the limiting groove, the threaded holes on the outer adapter ring and the threaded holes on the inner adapter ring correspond to each other, improving the smoothness of the subsequent bolt installation and enhancing the connection efficiency.

[0018] Preferably, the end of the limiting strip facing the bottom of the limiting groove is arc-shaped.

[0019] By adopting the above technical solution, a guiding effect is achieved, enabling the limiting strip to be inserted into the limiting groove more quickly.

[0020] Preferably, the limiting groove is opened at the position between two adjacent threaded holes on the outer adapter ring.

[0021] By adopting the above technical solution, the positions of the grooving and hole opening are staggeredly arranged, enhancing the strength of the overall structure.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. When installing two adjacent steel casing bodies, the outer adapter ring is inserted into the outer adapter slot for initial positioning, and the outer side wall and the inner side wall of the spliced steel casing are made flush. Then, the outer adapter ring and the inner adapter ring are connected by connectors arranged at intervals in the circumferential direction. The entire structure greatly reduces the area of the steel casing protruding from the surface, thus reducing the resistance-generating structure, improving the smoothness of pulling out the steel casing subsequently, and further improving the construction efficiency.

[0024] 2. Since the cross-section of the screwing head is semi-elliptical, the resistance is further reduced, making it smoother to pull out the steel casing.

[0025] 3. During the process of inserting the outer adapter ring into the outer adapter slot, when the limiting strip is inserted into the limiting slot, the threaded holes on the outer adapter ring and the threaded holes on the inner adapter ring are corresponding, improving the smoothness of subsequent bolt installation and enhancing the connection efficiency. Description of the Drawings

[0026] Figure 1 is a cross-sectional view of the connection structure between two adjacent steel casing bodies in an embodiment of the present application.

[0027] Figure 2 is Figure 1 a partial enlarged view of A in

[0028] Figure 3 is a schematic diagram of the limiting strip and the limiting slot structure in an embodiment of the present application.

[0029] Description of the Reference Numerals:

[0030] 1. Steel casing body; 11. Outer adapter slot; 12. Inner adapter slot; 13. Inner adapter ring; 14. Outer adapter ring; 15. Threaded hole; 16. Limiting strip; 17. Limiting slot; 2. Bolt; 21. Screw rod; 22. Screwing head. Detailed Embodiment

[0031] The following further describes the present application in detail with reference to the Figures 1-3 drawings.

[0032] An embodiment of the present application discloses a low-resistance connection structure for steel casings in the construction of full-casing follow-up cast-in-place piles. Refer to Figure 1, the low-resistance connection structure of the steel casing includes a number of steel casing bodies 1 arranged sequentially in the vertical direction. On the outer side wall of one end of each steel casing body 1, an outer fitting groove 11 is circumferentially provided, and on the inner side wall of the other end, an inner fitting groove 12 is circumferentially provided. The part of the steel casing body 1 where the outer fitting groove 11 is opened forms an inner fitting ring 13, and the part where the inner fitting groove 12 is opened forms an outer fitting ring 14. The outer fitting ring 14 of one steel casing body 1 is inserted into the outer fitting groove 11 of an adjacent steel casing body 1 to achieve the initial positioning of two adjacent steel casing bodies 1, and the thickness of the overlapping inner fitting ring 13 and outer fitting ring 14 in two adjacent steel casing bodies 1 is the same as the thickness of the steel casing body 1. When the initial positioning is completed, the outer side wall and the inner side wall of the spliced steel casing are flush.

[0033] Refer to Figure 1 and Figure 2 , the mutually inserted inner fitting ring 13 and outer fitting ring 14 are detachably connected by connectors arranged at equal intervals circumferentially; the connectors include bolts 2, and the bolts 2 include screw rods 21 and screwing heads 22. The inner fitting ring 13 and the outer fitting ring 14 are both provided with threaded holes 15 at equal intervals circumferentially. The threaded holes 15 of the inner fitting ring 13 and the threaded holes 15 of the outer fitting ring 14 are arranged in one-to-one correspondence. At the corresponding threaded holes 15 on the inner fitting ring 13 and the outer fitting ring 14, a bolt 2 is provided. The screw rod 21 is simultaneously threadedly installed in the threaded hole 15 of the inner fitting ring 13 and the corresponding threaded hole 15 of the outer fitting ring 14. The end of the screw rod 21 facing the inside of the steel casing body 1 is flush with the inner side wall of the steel casing body 1, so as to achieve the connection of two adjacent steel casing bodies 1; the screwing head 22 is fixedly installed at the outer end of the screw rod 21, and the screwing head 22 abuts against the outer side wall of the outer fitting ring 14, and, the screwing head 22 covers the connection seam located outside between two adjacent steel casing bodies 1; the cross-section of the screwing head 22 is semi-elliptical, so that the surface of the structure protruding outside the steel casing is smooth, reducing the resistance to pulling out the steel casing subsequently.

[0034] Refer to Figure 3 , on one side of the inner fitting ring 13 corresponding to the outer fitting groove 11, four limiting strips 16 are arranged at equal intervals circumferentially. The limiting strips 16 extend along the length direction of the steel casing body 1, and the end of the limiting strip 16 facing the bottom of the limiting groove 17 is arc-shaped; at the positions corresponding to each limiting strip 16 on the outer fitting ring 14, limiting grooves 17 are opened, and the limiting grooves 17 are opened at the positions between two adjacent threaded holes 15 corresponding to the outer fitting ring; the limiting strips 16 are inserted into the outer fitting ring 14 through the limiting grooves 17, so that after the outer fitting ring 14 is inserted into the outer fitting groove 11, each threaded hole 15 is accurately corresponding.

[0035] The implementation principle of a low-resistance connection structure for steel casing in the construction of fully enclosed casing followed bored piles in the embodiments of this application is as follows: When installing two adjacent steel casing bodies 1, insert the outer adaptor ring 14 into the outer adaptor slot 11 so that the limit strip 16 is inserted into the limit slot 17 to achieve preliminary positioning; then screw each bolt 2 into each pair of corresponding threaded holes 15 until the screwing head 22 abuts against the outer side wall of the steel casing body 1, thereby completing the stable connection of two adjacent steel casing bodies 1 and making it smoother to pull out the steel casing body 1.

[0036] The above are all preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A low-resistance connection structure of steel casing in full casing follow-up bored pile construction, comprising a plurality of steel casing bodies (1), characterized in that: The outer side wall at one end of the steel casing body (1) is provided with an outer adaption groove (11) along the circumferential direction and forms an inner adaption ring (13), and the inner side wall at the other end is provided with an inner adaption groove (12) along the circumferential direction and forms an outer adaption ring (14); the outer adaption ring (14) of one steel casing body (1) is inserted into the outer adaption groove (11) of the adjacent steel casing body (1); the inner adaption ring (13) and the outer adaption ring (14) inserted into each other are detachably connected via connecting pieces spaced apart along the circumferential direction.

2. According to claim 1, a low-resistance connection structure for steel casing in full casing follow-up bored pile construction is characterized in that: The connecting member comprises a bolt (2), the inner adapter ring (13) and the outer adapter ring (14) are both provided with threaded holes (15) spaced apart along the circumferential direction, the threaded holes (15) of the inner adapter ring (13) and the threaded holes (15) of the outer adapter ring (14) are arranged in a one-to-one correspondence, and the bolt (2) is simultaneously threadedly mounted in the threaded holes (15) of the inner adapter ring (13) and the corresponding threaded holes (15) of the outer adapter ring (14).

3. According to claim 2, a low-resistance connection structure for steel casing in full casing follow-up bored pile construction is characterized in that: The bolt (2) comprises a screw rod (21) and a screwing head (22); the screw rod (21) is threadedly mounted in the threaded hole (15); the screwing head (22) is fixedly mounted on an outward end of the screw rod (21); and the cross section of the screwing head (22) is semi-elliptical.

4. According to claim 3, a low-resistance connection structure for steel casing in full casing follow-up bored pile construction is characterized in that: The twisting head (22) covers the connecting seams between adjacent steel casing bodies (1) and located on the outside.

5. According to claim 3, a low-resistance connection structure for steel casing in full casing follow-up bored pile construction is characterized in that: One end of the screw rod (21) facing the inside of the steel casing body (1) is flush with the inner wall of the steel casing body (1).

6. The low-resistance connection structure of steel casing in full casing follow-up bored pile construction according to claim 2 is characterized in that: Limiting strips (16) are arranged at intervals along the circumferential direction on one side of the inner adapter ring (13) corresponding to the outer adapter groove (11); limiting grooves (17) are provided on the outer adapter ring (14) at positions corresponding to the respective limiting strips (16); and the limiting strips (16) are plugged into the outer adapter ring (14) through the limiting grooves (17).

7. A low-resistance connection structure for steel casing in full casing follow-up bored pile construction according to claim 6, characterized in that: One end of the limiting strip (16) facing the bottom of the limiting groove (17) is in an arc shape.

8. The low-resistance connection structure of steel casing in full casing follow-up bored pile construction according to claim 6 is characterized in that: The limiting groove (17) is provided at a position between two adjacent threaded holes (15) corresponding to the outer adapter ring (14).

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