Steel pipe pile stabilizing and centering frame

Abstract

A steel pipe pile stabilizing and centering frame comprises an upper circular ring support, a lower circular ring support and a middle support, the upper circular ring support and the lower circular ring support are in clearance fit with the outer circumference of a steel pipe pile, the middle support is in clearance fit with an inner hole of a core pile, and the upper circular ring support, the middle support and the lower circular ring support are connected into an integrated structure. And a channel for gravel to pass through is formed between the middle bracket and the upper circular ring bracket and between the middle bracket and the lower circular ring bracket. The utility model has the advantages of long service life, high repeated utilization rate and simple and reasonable structure.

Description

Technical Field

[0001] The utility model belongs to the technical field of foundation pit support, and particularly relates to a steel pipe pile stable centering frame. Background Technique

[0002] In the technical field of foundation pit support, with the popularization and application of inclined bracing in foundation pits, inclined drilling jet grouting mixing pile equipment has attracted more and more attention from technicians.

[0003] At present, the more commonly used inclined bracing generally has the following structure from bottom to top: a combined inclined pile composed of a steel lattice column, a steel pipe pile or a precast reinforced concrete pipe pile and other core piles wrapped by a cement-soil jet grouting mixing pile or a high-pressure cement jet grouting pile below the foundation pit floor; a steel support composed of a steel lattice column or a steel pipe pile above the foundation pit floor connected to the top of the combined inclined pile; the top of the steel support is fixedly connected to the steel corbel of the capping girder at the top of the foundation pit retaining wall or the foundation pit retaining row piles.

[0004] The existing inclined drilling jet grouting mixing pile equipment for constructing the above-mentioned inclined bracing generally includes a chassis or a base of a main machine supported on the foundation pit ground surface. The chassis generally includes traveling mechanisms such as a longitudinal movement mechanism and a transverse movement mechanism; an inclined bracing frame or a guiding frame for drilling jet grouting mixing piles is installed on the chassis, and there is an inclined bracing frame angle adjustment oil cylinder between the chassis and the inclined bracing frame; there is a power head and a pile pressing cap or a fixture for clamping the core pile or the steel support on the inclined bracing frame, and there is an oil cylinder for connecting or disassembling the drill pipe on the inclined bracing frame. There are two groups of driving mechanisms composed of a winch, a steel wire rope and a pulley block on the chassis and the inclined bracing frame for driving the power head and the pile pressing cap to move linearly along the inclined bracing frame. One group pays out and the other group takes in, driving the power head to drill down with the drill pipe and the pile pressing cap to press the core pile or the steel support down, or one group takes in and the other group pays out, driving the power head to reset with the drill pipe and the pile pressing cap; a high-pressure cement slurry delivery pipe connected to the cement slurry source and a pump is installed in the drill pipe, and a slurry spraying port is located at the drill bit. The slurry spraying from the slurry spraying port when the drill bit drills down and the propulsion of the core pile and the steel support are carried out synchronously. The high pressure such as the pressure of the slurry delivery pipe and the pressure of the spraying port is 20-35 MPa.

[0005] However, in the actual construction process, the inclined drilling jet grouting mixing pile driving equipment of the above existing technology still has the following deficiencies: Since the drill pipe drills obliquely, and the core pile and steel supports such as steel lattice columns or steel pipe piles are also advanced obliquely, and since the lengths of the drill pipe and the core pile entering the soil are relatively long, such as about 8 meters deep from the ground surface to the foundation pit bottom slab and about 18 meters deep from the foundation pit bottom slab to the predetermined bottom elevation, a total of about 26 meters deep, it is very difficult to avoid phenomena such as the lower end of the drill pipe sagging, drilling an arc-shaped hole, and the core pile being eccentric with the jet grouting pile during the process of the drill pipe drilling and the core pile and steel support advancing, that is, the protective thickness of the cement-soil jet grouting mixing pile for the core pile is uneven, which directly affects the design strength and bearing capacity of the combined inclined pile and steel support, that is, the inclined support of the foundation pit, and it is difficult to ensure that the inclined support has a high ability to resist the lateral soil pressure borne by the foundation pit retaining wall or the foundation pit retaining row piles and the capping beam, and there is even a potential safety hazard of foundation pit collapse, so it is urgent to improve. Summary of the Invention

[0006] In order to solve the above problems existing in the current technology, the utility model provides a steel pipe pile stable centering frame with a long service life, a high reuse rate, and a simple and reasonable structure.

[0007] The technical solution adopted by the utility model is as follows:

[0008] A steel pipe pile stable centering frame includes an upper ring bracket and a lower ring bracket that are in clearance fit with the outer circumference of the steel pipe pile, and an intermediate bracket that is in clearance fit with the inner hole of the core pile. The upper ring bracket, the intermediate bracket, and the lower ring bracket are connected into an integral structure, and a passage for sand and gravel to pass through is provided between the intermediate bracket and the upper ring bracket and the lower ring bracket.

[0009] Further, the upper ring bracket, the intermediate bracket, and the lower ring bracket are connected into an integral structure through a plurality of connecting plates.

[0010] Further, the outer surface of the connecting plate has a U-shaped groove fixedly connected with the intermediate bracket.

[0011] Further, the upper and lower ends of the inner surface of the connecting plate have L-shaped grooves fixedly connected with the upper ring bracket and the lower ring bracket respectively.

[0012] Further, the outer end face between the outer end of the L-shaped groove and the corresponding end of the U-shaped groove is a bevel structure.

[0013] Further, 4 connecting plates are provided and are evenly distributed on the circumferential surface.

[0014] Further, the upper ring bracket, the intermediate bracket, and the lower ring bracket are all welded to the connecting plate.

[0015] Further, a limiting structure is provided at the outer end of the upper ring bracket and the outer end of the lower ring bracket of the steel pipe pile.

[0016] Further, the middle bracket is a circular ring bracket.

[0017] Alternatively, the middle bracket includes arc brackets with the same number as the connecting plates. A plurality of arc brackets are spaced apart and the shape of the connecting line of the cross-sectional projections is a circular ring structure.

[0018] The beneficial effects of the present utility model are: long service life, high reuse rate, and simple and reasonable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the installation structure of the first embodiment of the present utility model.

[0020] Figure 2 It is a schematic diagram of the top view structure after installation of the first embodiment of the present utility model.

[0021] Figure 3 It is a schematic diagram of the sectional view structure of the first embodiment of the present utility model.

[0022] Figure 4 It is a schematic diagram of the structure of the connecting plate of the first embodiment of the present utility model.

[0023] Figure 5 It is a schematic diagram of the installation structure of the second embodiment of the present utility model.

[0024] Figure 6 It is a schematic diagram of the top view structure after installation of the second embodiment of the present utility model.

[0025] Figure 7 It is a schematic diagram of the sectional view structure of the second embodiment of the present utility model.

[0026] In the figure: 1, upper circular ring bracket; 2, lower circular ring bracket; 3, middle bracket; 31, arc bracket; 4, connecting plate; 41, U-shaped groove; 42, L-shaped groove; 43, inclined surface structure; 5, steel pipe pile; 6, channel; 7, limiting structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present utility model will be further described below in conjunction with specific embodiments, but the present utility model is not limited to these specific embodiments. Those skilled in the art should recognize that the present utility model covers all alternative solutions, improvement solutions, and equivalent solutions that may be included within the scope of the claims.

[0028] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

[0029] In the present utility model, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0030] In the present utility model, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0031] Embodiment 1

[0032] See Figures 1-4 , this embodiment provides a steel pipe pile stable centering frame, which includes an upper ring bracket 1 and a lower ring bracket 2 that are in clearance fit with the outer circumference of the steel pipe pile 5, and an intermediate bracket 3 that is in clearance fit with the inner hole of the core pile. The upper ring bracket 1, the intermediate bracket 3 and the lower ring bracket 2 are connected into an integral structure, and a channel 6 for sand and gravel to pass through is provided between the intermediate bracket 3 and the upper ring bracket 1 and the lower ring bracket 2.

[0033] In this embodiment, the upper ring bracket 1, the middle bracket 3, and the lower ring bracket 2 are connected into an integral structure by a plurality of connecting plates 4. The outer surface of the connecting plate 4 has a U-shaped groove 41 fixedly connected to the middle bracket 3. The upper and lower ends of the inner surface of the connecting plate 4 have L-shaped grooves 42 fixedly connected to the upper ring bracket 1 and the lower ring bracket 2 respectively. The outer end surface between the outer end of the L-shaped groove 42 and the corresponding end of the U-shaped groove 41 is an inclined surface structure 43. There are 4 connecting plates 4, which are evenly distributed on the circumferential surface. The upper ring bracket 1, the middle bracket 3, and the lower ring bracket 2 are all welded to the connecting plate 4.

[0034] In this embodiment, a limiting structure 7 is provided at the outer end of the upper ring bracket 1 and the outer end of the lower ring bracket 2 of the steel pipe pile 5. The limiting structure 7 can be a ring structure or a limiting block.

[0035] In this embodiment, the middle bracket 3 is a ring bracket. The upper ring bracket 1 and the lower ring bracket 2 have the same size. The sizes of the upper ring bracket 1, the lower ring bracket 2, and the middle bracket 3 can all be set as required. For example, if the size of the steel pipe pile 5 is 170 mm and the inner hole size of the core pile is 280 mm, then the sizes of the upper ring bracket 1 and the lower ring bracket 2 can be an inner diameter of 170 mm, an outer diameter of 190 mm, a thickness of 20 mm, and a length of 100 mm; the size of the middle bracket can be an inner diameter of 260 mm, an outer diameter of 280 mm, a thickness of 20 mm, and a length of 100 mm. After being connected by the connecting plate 4, the overall length formed is 350 mm. Similarly, for better welding connection and ensuring the connection strength, the length of the U-shaped groove 41 of the connecting plate 4 is 100 mm and the depth is 20 mm; the length of the L-shaped groove 42 is 100 mm and the depth is 20 mm. The overall length of the connecting plate 4 is 350 mm, the width is 110 mm, and the thickness is 20 mm.

[0036] The utility model has a long service life, high reuse rate, and a simple and reasonable structure.

[0037] Embodiment Two

[0038] Refer to Figures 5-7 , the difference between this embodiment and Embodiment One is that: the middle bracket 3 includes arc brackets 31 with the same number as the connecting plates 4. A plurality of arc brackets 31 are spaced apart and the shape of the connecting lines of the cross-sectional projections is a ring structure. The gaps between the arc brackets 31 are more convenient for sand and soil to pass through and will not get stuck.

[0039] For the rest of the structure and functions, reference can be made to those described in Embodiment One.

Claims

1. A steel pipe pile stable centering frame, characterized in that: It includes an upper circular ring bracket and a lower circular ring bracket that match the outer circumferential clearance of the steel pipe pile, and an intermediate bracket that matches the inner hole clearance of the core pile. The upper circular ring bracket, the intermediate bracket and the lower circular ring bracket are connected into an integrated structure, and a channel for sand and gravel to pass through is provided between the intermediate bracket and the upper circular ring bracket and the lower circular ring bracket.

2. A steel pipe pile stable centering frame according to claim 1, characterized in that: The upper circular ring bracket, the middle bracket and the lower circular ring bracket are connected into an integral structure through a plurality of connecting plates.

3. A steel pipe pile stable centering frame according to claim 2, characterized in that: The outer surface of the connecting plate has a U-shaped groove fixedly connected to the intermediate bracket.

4. A steel pipe pile stable centering frame according to claim 3, characterized in that: The inner surface of the connecting plate has L-shaped grooves at the upper and lower ends thereof, which are respectively fixedly connected to the upper circular ring bracket and the lower circular ring bracket.

5. A steel pipe pile stable centering frame according to claim 4, characterized in that: The outer end surface between the outer end of the L-shaped groove and the corresponding end of the U-shaped groove is a slope structure.

6. A steel pipe pile stable centering frame according to claim 2, characterized in that: There are four connecting plates, which are evenly distributed on the circumferential surface.

7. A steel pipe pile stable centering frame according to claim 6, characterized in that: The upper circular ring bracket, the middle bracket and the lower circular ring bracket are all connected to the connecting plate by welding.

8. The steel pipe pile stable centering frame according to claim 1, characterized in that: The steel pipe pile is provided with a limiting structure at the outer end of the upper circular ring support and the outer end of the lower circular ring support.

9. The steel pipe pile stable centering frame according to claim 1, characterized in that: The intermediate bracket is a circular bracket.

10. The steel pipe pile stable centering frame according to claim 1, characterized in that: The intermediate bracket includes arc brackets whose number is the same as that of the connecting plates, and the arc brackets are distributed at intervals and the connecting line shape of the cross-sectional projection is a circular ring structure.

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