Tubular pile and tubular pile mounting method

Abstract

The invention provides a pipe pile and a pipe pile installation method, and relates to the technical field of constructions.The pipe pile comprises an annular pipe, a plurality of first through holes are formed in the annular pipe, and the first through holes are arranged in the axial direction of the annular pipe; the first area of the fixing rib is located in the annular pipe, the first area is adjacent to the second area of the fixing rib, the axis of the fixing rib coincides with the axis of the annular pipe, and the interior of the annular pipe and the periphery of the fixing rib form a hollow structure; in the installation process of the pipe pile, the annular pipe and the first area of the fixing rib are located in a first hole of a soil layer, the second area of the fixing rib is located in a second hole of a rock layer horizontally below the soil layer, and the diameter of the second hole is smaller than that of the first hole. The first holes and the second holes are used for grouting and fixing the annular pipe and the fixing ribs. The installation efficiency of the pipe pile can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to a pipe pile and a pipe pile installation method. Background Art

[0002] Pipe piles are important components for building overhead transmission lines. Pipe piles are installed to fix the electric towers. In related technologies, the soil layer is usually excavated and large-diameter pipe piles are fixed in the soil layer to achieve stable fixation of the electric towers. However, in related technologies, the soil layer is shallow in mountainous or hilly areas, and the pipe piles need to be fixed in the rock layer. The rock layer is harder than the soil layer, and it is more difficult to drill large-diameter holes in the rock layer, which consumes more time, resulting in low installation efficiency of pipe piles.

[0003] It can be seen that the related art has the problem of low installation efficiency of pipe piles. Summary of the invention

[0004] The embodiments of the present invention provide a pipe pile and a pipe pile installation method to solve the problem of low pipe pile installation efficiency in the related art.

[0005] To solve the above problems, the present invention is achieved as follows:

[0006] In a first aspect, an embodiment of the present invention provides a pipe pile, comprising:

[0007] An annular tube, wherein the annular tube is provided with a plurality of first through holes, and the plurality of first through holes are arranged along the axial direction of the annular tube;

[0008] A fixing rib, wherein a first region of the fixing rib is located in the annular tube, the first region is adjacent to a second region of the fixing rib, an axis of the fixing rib coincides with an axis of the annular tube, and an interior of the annular tube and an outer periphery of the fixing rib form a hollow structure;

[0009] During the installation of the pipe piles, the first area of ​​the annular tube and the fixing bars are located in a first hole in the soil layer, and the second area of ​​the fixing bars is located in a second hole in the rock layer below the soil layer level. The diameter of the second hole is smaller than the diameter of the first hole. The first hole and the second hole are used for grouting and fixing the annular tube and the fixing bars.

[0010] In one embodiment, the pipe pile further comprises at least one grouting pipe, and the grouting pipe is fixed to the inner side of the annular pipe;

[0011] The annular tube is provided with a plurality of second through holes, and the grouting tube is provided with a plurality of third through holes on one side close to the annular tube, one of the plurality of second through holes is connected with one of the plurality of third through holes, the second through holes are arranged along the axial direction of the annular tube, and the third through holes are arranged along the axial direction of the grouting tube;

[0012] A plurality of fourth through holes are provided on one side of the grouting pipe away from the annular pipe, and the fourth through holes are arranged along the axial direction of the grouting pipe;

[0013] During the installation of the pipe pile, the grouting pipe is used to perform secondary grouting on the first hole located in the soil layer to strengthen the fixation of the annular pipe and the fixing ribs.

[0014] In one embodiment, each of the plurality of first through holes is provided with a first rubber plug, and the size of the first rubber plug is adapted to the size of each first through hole; and / or,

[0015] Each of the plurality of second through holes is provided with a second rubber plug, and the size of the second rubber plug is adapted to the size of each of the second through holes; and / or,

[0016] Each of the plurality of third through holes is provided with a third rubber plug, and the size of the third rubber plug is adapted to the size of each of the third through holes; and / or,

[0017] Each of the plurality of fourth through holes is provided with a fourth rubber plug, and a size of the fourth rubber plug is adapted to a size of each of the fourth through holes.

[0018] In one embodiment, an outer side of one end of the grouting pipe away from the second region of the fixing rib is provided with an external thread.

[0019] In one embodiment, the length of the grouting pipe along the axial direction is adapted to the length of the annular pipe along the axial direction.

[0020] In one embodiment, the plurality of first through holes are arranged to form at least two rows of first through holes, each row of first through holes is distributed along the axis of the annular tube, and each row of first through holes is evenly distributed on the outer circumference of the annular tube.

[0021] In one embodiment, at least two anchors are provided at one end of the fixing rib away from the first region, and the at least two anchors are evenly distributed around the periphery of the fixing rib.

[0022] In one embodiment, a fixing bolt is provided at one end of the fixing rib away from the second area.

[0023] In a first aspect, an embodiment of the present invention provides a pipe pile installation method, which is used to install any pipe pile as described in the first aspect, comprising:

[0024] digging a first hole in a soil layer until a rock layer below the level of the soil layer is reached;

[0025] Fixing the annular tube in the first hole;

[0026] Excavating the rock layer with the axis of the annular tube as the center to form a second hole, wherein the diameter of the second hole is smaller than the diameter of the first hole;

[0027] Fixing the second area of ​​the fixing rib in the second hole;

[0028] The first holes and the second holes are grouted for the first time through the plurality of first through holes of the annular tube to strengthen the fixation of the annular tube and the fixing ribs.

[0029] In one embodiment, after grouting the first holes and the second holes for the first time through the plurality of first through holes of the annular tube, the method further comprises:

[0030] After the first grouting is finished after a set first time, a second grouting is performed into the first hole through the plurality of second through holes of the annular tube, the plurality of third through holes and the plurality of fourth through holes of the grouting tube.

[0031] One of the above technical solutions has the following advantages or beneficial effects:

[0032] In an embodiment of the present invention, a pipe pile including an annular tube and fixing ribs is provided, wherein a plurality of first through holes are provided on the annular tube, and the plurality of first through holes are arranged along the axial direction of the annular tube; a first area of ​​the fixing ribs is located in the annular tube, the first area is adjacent to a second area of ​​the fixing ribs, the axis of the fixing ribs coincides with the axis of the annular tube, and the interior of the annular tube and the periphery of the fixing ribs form a hollow structure; during the installation of the pipe piles, the first areas of the annular tube and the fixing ribs are located in a first hole in a soil layer, and the second area of ​​the fixing ribs is located in a second hole in a rock layer below the soil layer level, the diameter of the second hole is smaller than the diameter of the first hole, and it is not necessary to dig the second hole in the rock layer and the first hole in the soil layer to the same size, thereby reducing the difficulty of opening holes in the rock layer, reducing the time of opening holes in the rock layer, and thereby improving the installation efficiency of the pipe piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0034] Figure 1 It is a structural schematic diagram of a pipe pile provided by an embodiment of the present invention;

[0035] Figure 2 is a schematic structural diagram of an annular tube provided in an embodiment of the present invention;

[0036] Figure 3 is a schematic diagram of the AA section of a pipe pile provided by an embodiment of the present invention;

[0037] Figure 4 It is a schematic diagram of the structure of a grouting pipe provided by an embodiment of the present invention;

[0038] Figure 5 is a schematic diagram after the first grouting provided by an embodiment of the present invention;

[0039] Figure 6 is a schematic diagram after the second grouting provided by an embodiment of the present invention;

[0040] Figure 7 is a schematic diagram of cutting an annular tube provided in an embodiment of the present invention;

[0041] Figure 8 is a schematic diagram of the structure of the fixing ribs provided in an embodiment of the present invention;

[0042] Fig. 9 is a schematic structural diagram of an anchor provided by an embodiment of the present invention;

[0043] Fig.10 is a schematic diagram of the positions of the fixing bolts provided in an embodiment of the present invention;

[0044] Fig.11 is a top view of the structure of the platform provided by an embodiment of the present invention;

[0045] Fig.12 is a flow chart of a pipe pile installation method provided by an embodiment of the present invention;

[0046] Fig.13 It is a schematic diagram of the load-bearing reinforcement of different soil layers provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the construction of power grids, overhead transmission lines are a commonly used technical means, and the pipe piles of overhead transmission lines are fixed on the ground through pipe piles. Among them, the pipe piles are subjected to alternating vertical loads of tension / compression, and also bear large horizontal loads, and the horizontal load is usually 1 / 8 to 1 / 7 of the vertical load. Therefore, anti-pullout and anti-overturning stability are usually necessary conditions for the design of pipe piles for transmission lines. In order to meet the requirements for safe and stable operation of pipe piles for transmission lines, the pipe piles in the transmission line industry must be buried in the soil below the ground. According to the general design results of existing power transmission and transformation projects, taking the straight tower as an example, the range of the foundation force contained in the straight tower under different voltage levels is shown in Table 1.

[0049] Table 1

[0050]

[0051]

[0052] The minimum foundation force and the maximum foundation force in Table 1 are combined to obtain the foundation force range covering 90% of the general design of straight towers as shown in Table 2.

[0053] Table 2

[0054]

[0055] According to engineering practice experience, currently, overhead power transmission line projects in mountainous and hilly areas usually use three types of pipe piles for installation: rock anchor foundation, excavation foundation and bored pile foundation. Usually, when the thickness of the tower foundation overburden layer is less than 3m, rock anchor foundation is usually used to reduce earthwork excavation and protect the environment. When the thickness of the tower foundation overburden layer is greater than 3m, excavation foundation and large-diameter bored piles are usually used. In order to meet the bearing requirements of the forces shown in Tables 1 and 2, for 110 (66) kV and 220 (330) kV voltage level transmission lines, the burial depth of the excavation foundation and large-diameter bored piles is generally greater than 6m. It can be seen that when the thickness of the tower foundation overburden layer is greater than 3m and less than 6m, part of the pipe piles of the excavation foundation and large-diameter bored pile foundation need to be buried in the rock layer under the soil layer. At this time, the transmission line faces the problem that it is more difficult to excavate holes in the rock layer than in the soil layer. In an embodiment of the present invention, a pipe pile and a pipe pile installation method are developed for a transmission line tower site with a binary stratum distribution characteristic of "upper soil and lower rock" and a soil layer thickness greater than 3m and less than 6m, which can not only meet the foundation bearing performance requirements but also ensure the safety of foundation construction. See the subsequent embodiments for details.

[0056] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a pipe pile, characterized in that it includes:

[0057] An annular tube 10, wherein the annular tube 10 is provided with a plurality of first through holes 301, and the plurality of first through holes 301 are arranged along the axial direction of the annular tube 10;

[0058] A fixing rib 20, wherein a first region of the fixing rib 20 is located in the annular tube 10, the first region is adjacent to a second region of the fixing rib 20, an axis of the fixing rib 20 coincides with an axis of the annular tube 10, and the interior of the annular tube 10 and the periphery of the fixing rib 20 form a hollow structure;

[0059] During the installation of the pipe piles, the first area of ​​the annular tube 10 and the fixing bar 20 is located in the first hole 101 of the soil layer, and the second area of ​​the fixing bar 20 is located in the second hole 201 of the rock layer below the soil layer level. The diameter of the second hole 201 is smaller than the diameter of the first hole 101. The first hole 101 and the second hole 201 are used for grouting and fixing the annular tube 10 and the fixing bar 20.

[0060] The annular tube 10 is arranged in the soil layer, and the annular tube 10 is used to fill fine stone concrete to form a slow-setting structure in the soil layer. It should be understood that since the annular tube 10 is buried in the soil layer, the soil layer is relatively loose, and the soil layer around the annular tube 10 needs to be reinforced. In the embodiment of the present invention, a plurality of first through holes 301 are provided on the annular tube 10, so that in the process of filling the annular tube 10 with fine stone concrete (i.e. grouting), the fine stone concrete penetrates into the soil layer around the annular tube 10 through the plurality of first through holes 301, and after the fine stone concrete solidifies, the strength of the soil layer where the annular tube 10 is located can be effectively strengthened, thereby improving the stability of the pile.

[0061] The plurality of first through holes 301 are arranged along the axial direction of the annular tube 10, so that in the process of filling the annular tube 10 with fine stone concrete, the fine stone concrete can penetrate into different positions of the soil layer through the plurality of through holes, thereby achieving uniform reinforcement of the soil layer where the annular tube 10 is located. Preferably, the plurality of first through holes 301 are evenly arranged, and the spacing d between each first through hole 301 is 1 / 4. 1 It is 300mm.

[0062] Furthermore, the annular pipe 10 is preferably a seamless steel pipe with an outer diameter of 219 mm to 273 mm to ensure that the pipe piles after grouting of the soil layer can withstand the required tensile / compressive alternating vertical loads and the required horizontal loads.

[0063] It should be understood that due to the different hardness of the soil layer and the rock layer, and since the hardness of the rock layer is greater than that of the soil layer, the radius of the pipe piles formed by fine stone concrete in the rock layer can be smaller than the radius of the pipe piles formed by fine stone concrete in the soil layer, and the pipe piles in the soil layer and the pipe piles in the rock layer can both withstand the required tensile / compressive alternating vertical loads, as well as the required horizontal loads.

[0064] Among them, since the hardness of the rock layer is relatively high, it is not necessary to reinforce it through the outer periphery of the annular tube 10 similar to the soil layer, so the annular tube 10 is only set in the soil layer, the length of the annular tube 10 in the axial direction is adapted to the thickness of the soil layer, and the diameter of the annular tube 10 is adapted to the diameter of the first hole 101 in the soil layer. The annular tube 10 is not set in the rock layer, and only the second hole 201 is opened in the rock layer. The second hole 201 is smaller than the first hole 101, so that the pipe piles in the soil layer and the pipe piles in the rock layer can withstand the required tension / compression alternating vertical load, as well as the required horizontal load.

[0065] The above-mentioned fixing ribs 20 are located in the pipe pile formed by fine stone concrete, and can be steel bars or made of other high-strength metals. The axial bearing capacity and bending and shearing resistance of the pipe pile can be strengthened by the fixing ribs 20. It should be understood that fine stone concrete will be filled in the soil layer and the rock layer, and the fixing ribs 20 are used to enhance the axial bearing capacity and bending and shearing resistance of the pipe pile. It is necessary to set the fixing ribs 20 in both the soil layer and the rock layer, that is, the first area of ​​the fixing ribs 20 is located in the first hole 101 of the soil layer, and the second area of ​​the fixing ribs 20 is located in the second cavity of the rock layer, so as to realize the reinforcement of the entire pipe pile.

[0066] The fixing bar 20 may be made of high-strength steel bars with a diameter of 32 mm to 40 mm, and the steel bars may be HRB400 or steel bars with a strength higher than HRB400. The diameter of the second hole 201 is 2 to 3 times the diameter of the fixing bar 20, and the diameter of the second hole 201 is greater than or equal to 90 mm and less than or equal to 150 mm.

[0067] In an embodiment of the present invention, a pipe pile including an annular tube 10 and a fixing rib 20 is provided. The annular tube 10 is provided with a plurality of first through holes 301, and the plurality of first through holes 301 are arranged along the axial direction of the annular tube 10; a first region of the fixing rib 20 is located in the annular tube 10, the first region is adjacent to a second region of the fixing rib 20, the axis of the fixing rib 20 coincides with the axis of the annular tube 10, and the interior of the annular tube 10 and the periphery of the fixing rib 20 form a hollow structure; during the installation of the pipe pile, the first region of the annular tube 10 and the fixing rib 20 are located in a first hole 101 in a soil layer, and the second region of the fixing rib 20 is located in a second hole 201 in a rock layer below the soil layer level, the diameter of the second hole 201 is smaller than the diameter of the first hole 101, and it is not necessary to dig the second hole 201 in the rock layer and the first hole 101 in the soil layer into the same size, thereby reducing the difficulty of drilling holes in the rock layer, reducing the drilling time in the rock layer, and thereby improving the installation efficiency of the pipe pile.

[0068] In one embodiment, Figure 3 and Figure 4 As shown, the pipe pile further includes at least one grouting pipe 11, and the grouting pipe 11 is fixed to the inner side of the annular pipe 10;

[0069] The annular tube 10 is provided with a plurality of second through holes, and the grouting tube 11 is provided with a plurality of third through holes 302 on one side close to the annular tube 10, one of the plurality of second through holes is connected to one of the plurality of third through holes 302, the second through holes are arranged along the axial direction of the annular tube 10, and the third through holes 302 are arranged along the axial direction of the grouting tube 11;

[0070] A plurality of fourth through holes are provided on one side of the grouting pipe 11 away from the annular pipe 10, and the fourth through holes are arranged along the axial direction of the grouting pipe 11;

[0071] During the installation of the pipe pile, the grouting pipe 11 is used to perform secondary grouting on the first hole 101 located in the soil layer to strengthen the fixation of the annular pipe 10 and the fixing ribs 20 .

[0072] The axial length of the above-mentioned grouting pipe 11 is adapted to the thickness of the soil layer. Secondary grouting is performed on the outer periphery of the annular pipe 10 through the multiple third through holes 302 on the grouting pipe 11 and the multiple second through holes on the annular pipe 10, and secondary grouting is performed on the inner side of the annular pipe 10 through the multiple fourth through holes on the grouting pipe 11 to strengthen the fixation of the annular pipe 10 and the fixing ribs 20.

[0073] It should be understood that Figure 5 and Figure 6As shown, in the first grouting process, grouting is performed directly from the level of the annular pipe 10 placed in the soil layer to the first hole 101 and the second hole 201, and fine stone concrete is filled. After the first grouting, the second hole 201 is filled, and only the first hole 101 needs to be grouted for the second time. In the second grouting process, pure cement slurry is poured into the outer periphery and inner side of the annular pipe 10 through the grouting pipe 11 to further enhance the structural stability of the pile in the soil layer.

[0074] Among them, since fine stone concrete with larger particles is used in the first grouting process, pure cement slurry with smaller particles is used in the second grouting process, and the grouting pressure in the second grouting is greater than the grouting pressure in the first grouting, in the embodiment of the present invention, the diameters of the second through hole, the third through hole 302 and the fourth through hole are the same, and the diameter of the first through hole 301 is greater than the diameter of the second through hole, so that the fine stone concrete can penetrate into the outer layer of the annular tube 10 through the first through hole 301 during the first grouting process, and the pure cement slurry can penetrate into the outer periphery and inner side of the annular tube 10 through the second through hole 302 and the fourth through hole during the second grouting process. For example, the diameter of the first through hole 301 is 25mm to 30mm, and the diameters of the second through hole, the third through hole 302 and the fourth through hole are 15mm to 25mm.

[0075] The plurality of second through holes, the plurality of third through holes 302 and the plurality of fourth through holes are arranged axially, so as to realize the second grouting of the inner side and the outer periphery of the annular pipe 10 at different horizontal positions, and evenly strengthen the strength of the pipe pile in the soil layer. 2 It is 300 mm, thereby corresponding to each second through hole.

[0076] Furthermore, a plurality of grouting pipes 11 may be arranged in the pipe pile, each grouting pipe 11 is provided with a plurality of third through holes 302 and fourth through holes, and the plurality of second through holes on the annular pipe 10 are arranged as a plurality of rows of second through holes, and each row of second through holes corresponds one-to-one to the plurality of third through holes 302 on each grouting pipe 11, thereby achieving uniform grouting of the outer periphery and inner side of the annular pipe 10.

[0077] Furthermore, when multiple grouting pipes 11 are arranged in the pipe pile, the third through holes 302 on each grouting pipe 11 are staggered at different horizontal positions, so that the second grouting on the outer periphery of the annular pipe 10 can be more uniform; the fourth through holes on each grouting pipe 11 are staggered at different horizontal positions, so that the second grouting on the inner side of the annular pipe 10 can be more uniform.

[0078] It should be understood that the purpose of setting the second through hole in the embodiment of the present invention is to communicate with the third through hole 302, so as to achieve grouting of the grouting pipe 11 to the outer periphery of the annular pipe 10 through the second through hole and the third through hole 302. Those skilled in the art can achieve the same effect by changing the connection form of the grouting pipe 11 and the annular pipe 10. For example, Figure 7 As shown, the annular tube 10 is cut into two semicircular steel tubes, each of which is provided with a plurality of first through holes 301, and the first grouting is achieved through the plurality of first through holes 301. Two grouting pipes 11 are welded between the two semicircular steel tubes to form an integrated structure. The grouting pipe 11 is provided with a plurality of third through holes 302 and a plurality of fourth through holes, and the second grouting is achieved toward the outer periphery of the annular tube 10 through the plurality of third through holes 302, and the second grouting is achieved toward the inner side of the annular tube 10 through the plurality of fourth through holes.

[0079] Preferably, the diameter d of the annular tube 10 is 3 The diameter d of the grouting pipe 11 is 219 mm to 273 mm. 4 25mm to 30mm.

[0080] In an embodiment of the present invention, the pipe pile also includes at least one grouting pipe 11, which is fixed to the inner side of the annular pipe 10; the annular pipe 10 is provided with a plurality of second through holes, and the grouting pipe 11 is provided with a plurality of third through holes 302 on the side close to the annular pipe 10, one of the plurality of second through holes is connected to one of the plurality of third through holes 302, the second through holes are arranged along the axial direction of the annular pipe 10, and the third through holes 302 are arranged along the axial direction of the grouting pipe 11; the grouting pipe 11 is provided with a plurality of fourth through holes on the side away from the annular pipe 10, and the fourth through holes are arranged along the axial direction of the grouting pipe 11; during the installation of the pipe pile, the grouting pipe 11 is used to perform secondary grouting into the first hole 101 located in the soil layer to strengthen the fixation of the annular pipe 10 and the fixing ribs 20. At least one grouting pipe 11 is provided in the pipe pile, and a second grouting is performed on the outer periphery and inner side of the annular pipe 10 located in the soil layer through the grouting pipe 11, thereby strengthening the fixation of the annular pipe 10 and the fixing ribs 20, and further strengthening the strength of the pipe pile in the soil layer, so that the pipe pile in the soil layer can meet the vertical load of alternating tension / compression, and withstand the required horizontal load.

[0081] In one embodiment, each of the plurality of first through holes 301 is provided with a first rubber plug, and the size of the first rubber plug is adapted to the size of each first through hole 301; and / or,

[0082] Each of the plurality of second through holes is provided with a second rubber plug, and the size of the second rubber plug is adapted to the size of each of the second through holes; and / or,

[0083] Each of the plurality of third through holes 302 is provided with a third rubber plug, and the size of the third rubber plug is adapted to the size of each of the third through holes 302; and / or,

[0084] Each of the plurality of fourth through holes is provided with a fourth rubber plug, and a size of the fourth rubber plug is adapted to a size of each of the fourth through holes.

[0085] The first rubber plug, the second rubber plug, the third rubber plug and the fourth rubber plug are used to prevent the annular tube 10 and the grouting tube 11 from being blocked by impurities such as stones during the process of being placed in the soil layer, so as to avoid the situation where the annular tube 10 and the grouting tube 11 cannot be grouted through the through hole during the subsequent first grouting or second grouting due to blockage. In the embodiment of the present invention, by providing the first rubber plug, the second rubber plug, the third rubber plug and the fourth rubber plug, during the process of placing the annular tube 10 and the grouting tube 11 in the soil layer, since the rubber plug is provided in the through hole, the impurities in the soil layer cannot block the through hole. During the first grouting or the second grouting process, the rubber plug in the through hole is flushed open by the grouting pressure, thereby ensuring the smooth progress of the grouting process.

[0086] For example, the first rubber plug, the second rubber plug, the third rubber plug and the fourth rubber plug are rubber plugs or rubber leather sleeves, which seal the through hole and can only be opened under a pressure greater than 0.50MPa. The grouting pressure of the first grouting is about 0.8MPa to 1.0MPa, and the grouting pressure of the second grouting is above 1.5MPa. During the first grouting process, the first rubber plug is opened for grouting, and during the second grouting process, the second rubber plug, the third rubber plug and the fourth rubber plug are opened for grouting.

[0087] In the embodiment of the present invention, each of the multiple first through holes 301 is provided with a first rubber plug, and the size of the first rubber plug is adapted to the size of each first through hole 301; and / or, each of the multiple second through holes is provided with a second rubber plug, and the size of the second rubber plug is adapted to the size of each second through hole; and / or, each of the multiple third through holes 302 is provided with a third rubber plug, and the size of the third rubber plug is adapted to the size of each third through hole 302; and / or, each of the multiple fourth through holes is provided with a fourth rubber plug, and the size of the fourth rubber plug is adapted to the size of each fourth through hole, thereby preventing the annular tube 10 and the grouting tube 11 from being blocked by impurities such as stones during placement in the soil layer, thereby ensuring the smooth progress of the first grouting and / or the second grouting process.

[0088] In one embodiment, an outer side of one end of the grouting pipe 11 away from the second region of the fixing rib 20 is provided with an external thread.

[0089] It should be understood that after the first grouting is completed, the inner side of the annular tube 10 is filled with fine stone concrete, and the outer periphery and inner side of the annular tube 10 need to be grouted for the second time through the grouting pipe 11. However, after the first grouting, the inner side of the annular tube 10 has been filled, and the grouting device cannot be fixed to the grouting pipe 11 at this time. In the embodiment of the present invention, an external thread is provided on the outer layer of one end of the second area of ​​the grouting pipe 11 away from the fixing rib 20, and the external thread is threadedly fixed to the grouting device to achieve the second grouting of the outer periphery and inner side of the annular tube 10.

[0090] Specifically, one end of the grouting pipe 11 away from the second area of ​​the fixing rib 20 is higher than the upper end of the annular pipe 10, that is, the grouting pipe 11 includes an A area and a B area, the A area and the B area are adjacent, and the A area is fixed to the inner side of the annular pipe 10. When the annular pipe 10 is placed in the soil layer, the B area is located above the level of the soil layer, and an external thread is provided on the outer side of the B area for fixing the grouting device to achieve the second grouting of the outer periphery and the inner side of the annular pipe 10.

[0091] Among them, since area B is located above the level of area A, during the first grouting process, the grouted fine stone concrete will not enter the grouting pipe 11, which can avoid the problem of poor second grouting effect caused by large particles of impurities mixed in the grouting pipe 11.

[0092] In an embodiment of the present invention, an external thread is provided on the outer side of one end of the grouting pipe 11 away from the second area of ​​the fixing rib 20, so that the grouting pipe 11 can be threadedly fixed to the grouting device through the external thread to achieve a second grouting of the outer periphery and inner side of the annular pipe 10.

[0093] In one embodiment, the length of the grouting pipe 11 along the axial direction is adapted to the length of the annular pipe 10 along the axial direction.

[0094] It should be understood that since the soil layer is relatively soft and the rock layer is relatively hard, the grouting pipe 11 only performs a second grouting on the outer periphery and inner side of the annular pipe 10, and there is no need to perform a second grouting on the second hole 201 of the rock layer. Therefore, the length of the grouting pipe 11 along the axial direction is adapted to the length of the annular pipe 10 along the axial direction, and there is no need to extend into the second hole 201 of the rock layer to achieve a second grouting of only the annular pipe 10.

[0095] Among them, the grouting pipe 11 includes area A and area B, area A is fixed to the inner side of the annular pipe 10, and the length of the grouting pipe 11 along the axial direction is adapted to the length of the annular pipe 10 along the axial direction. Specifically, the length of area A along the axial direction is the same as the length of the annular pipe 10 along the axial direction.

[0096] For example, the length of the annular tube 10 along the axial direction is 3000 mm, the length of the A region of the grouting tube 11 along the axial direction is 3000 mm, and the length of the B region of the grouting tube 11 along the axial direction is 300 mm to 350 mm. A plurality of third through holes 302 and a plurality of fourth through holes are provided in the A region of the grouting tube 11, and the spacing between each third through hole 302 is 500 mm, and the spacing between each fourth through hole is 500 mm. An external thread is provided in the B region of the grouting tube 11, so that the outer periphery and the inner side of the annular tube 10 can be grouted for the second time through the grouting tube 11.

[0097] In one embodiment, the plurality of first through holes 301 are arranged to form at least two rows of first through holes 301 , each row of first through holes 301 is distributed along the axis of the annular tube 10 , and each row of first through holes 301 is evenly distributed on the outer circumference of the annular tube 10 .

[0098] In the embodiment of the present invention, at least two rows of first through holes 301 are formed by arranging a plurality of first through holes 301, each row of first through holes 301 is distributed along the axis of the annular tube 10, and each row of first through holes 301 is evenly distributed on the periphery of the annular tube 10, so that the first grouting can be performed at different positions on the periphery of the annular tube 10. At the same time, each row of first through holes 301 is evenly distributed on the periphery of the annular tube 10 to achieve uniform grouting on the periphery of the annular tube 10.

[0099] Furthermore, each first through hole 301 in each column of first through holes 301 is distributed at a different horizontal position of the annular tube 10 , that is, each first through hole 301 is staggered, so that grouting is performed at different horizontal positions of the annular tube 10 .

[0100] In one embodiment, Figure 8 As shown, at least two anchoring members 202 are provided at one end of the fixing rib 20 away from the first region, and the at least two anchoring members 202 are evenly distributed on the periphery of the fixing rib 20 .

[0101] It should be understood that the fixing ribs 20 are buried inside the pipe pile to strengthen the axial bearing capacity and bending and shearing capacity of the pipe pile. In the process of grouting reinforcement of the annular pipe 10 and the fixing ribs 20, it is necessary to fix the position of the fixing ribs 20 to avoid the movement of the fixing ribs 20 during the grouting process. In an embodiment of the present invention, at least two anchors 202 are provided at one end of the fixing rib 20 away from the first area, and at least two anchors 202 are evenly distributed on the periphery of the fixing rib 20, and the fixing rib 20 is fixed to the bottom of the second hole 201 by the anchors 202, thereby avoiding the movement of the fixing rib 20. At the same time, fixing the fixing rib 20 to the bottom of the second hole 201 by the anchors 202 can enhance the bearing capacity of the pipe pile in the axial direction of the tensile stress.

[0102] For example, Fig. 9 As shown, there are three anchors 202, which are made of steel bars of the same length and diameter. The length of the steel bars is greater than three times the diameter of the fixed rib 20. The anchors 202 and the fixed rib 20 are welded to the outer circumference of the fixed rib 20 and are evenly distributed at 120°. The fixed rib 20 is fixed in the second hole 201 through three anchors 202.

[0103] In one embodiment, Fig.10 As shown, a fixing bolt 203 is provided at one end of the fixing rib 20 away from the second area.

[0104] The fixing bolts 203 are used to fix the tower foot 401 of the base station tower 40 on the pipe pile. Specifically, the tower foot 401 of the base station tower 40 is provided with a mounting hole, and the fixing bolts 203 pass through the mounting hole and are fixed to the mounting hole by screws to fix the tower foot 401 of the base station tower 40.

[0105] In the process of power grid construction, after setting up the pipe piles, it is necessary to set up a cap 50 above the level of the pipe piles, place the tower foot 401 of the base station tower 40 on the cap 50, and install and fix it through the fixing bolts 203 of the fixing ribs 20. Fig.11 As shown, four pipe piles are arranged below the horizontal surface of the cap 50, and each pipe pile is provided with a fixing rib 20, so that four fixing bolts 203 are exposed above the horizontal surface of the cap 50 and fixed to the tower foot 401 of the base station tower 40. In order to enable the fixing bolts 203 of the fixing rib 20 to be fixed to the tower foot 401 of the base station tower 40, the length of the fixing rib 20 is equal to the depth L of the second hole 201. 1 , the depth L of the first hole 101 2 , the height of the cap 50 above the soil layer L 3 , and the height L of the fixing bolt 203 4 sum.

[0106] The excavation depth of the hole where the above-mentioned foundation 50 is located is relatively shallow, generally less than 1m, and the excavation difficulty is relatively low.

[0107] like Fig.12 As shown, the present invention also provides a pipe pile installation method for installing Figure 1 The pipe piles shown include:

[0108] digging a first hole in a soil layer until a rock layer below the level of the soil layer is reached;

[0109] Fixing the annular tube in the first hole;

[0110] Excavating the rock layer with the axis of the annular tube as the center to form a second hole, wherein the diameter of the second hole is smaller than the diameter of the first hole;

[0111] Fixing the second area of ​​the fixing rib in the second hole;

[0112] The first holes and the second holes are grouted for the first time through the plurality of first through holes of the annular tube to strengthen the fixation of the annular tube and the fixing ribs.

[0113] In an embodiment of the present invention, a first hole is excavated in the soil layer and a second hole is excavated in the rock layer, and the diameter of the second hole is smaller than the diameter of the first hole, thereby reducing the difficulty of excavation in the rock layer and improving the excavation efficiency. At the same time, the pipe pile includes a pipe pile of an annular tube and a fixed rib, and the annular tube is provided with a plurality of first through holes, and the plurality of first through holes are arranged along the axial direction of the annular tube; the first area of ​​the fixed rib is located in the annular tube, the first area is adjacent to the second area of ​​the fixed rib, the axis of the fixed rib coincides with the axis of the annular tube, and the inside of the annular tube and the outer periphery of the fixed rib form a hollow structure, and the first grouting of the outer periphery and the inner side of the annular tube is realized through the plurality of first through holes to strengthen the fixation of the annular tube and the fixed rib.

[0114] In one embodiment, after grouting the first holes and the second holes for the first time through the plurality of first through holes of the annular tube, the method further comprises:

[0115] After the first grouting is finished after a set first time, a second grouting is performed into the first hole through the plurality of second through holes of the annular tube, the plurality of third through holes and the plurality of fourth through holes of the grouting tube.

[0116] In an embodiment of the present invention, after the first period of time, the fine stone concrete of the first grouting has solidified. At this time, a second grouting is performed on the outer periphery and inner side of the annular tube through multiple second through holes of the annular tube, multiple third through holes of the grouting pipe, and multiple fourth through holes to further strengthen the strength of the pipe piles in the soil layer.

[0117] The process of burying the pipe piles in the ground according to the embodiment of the present invention is as follows:

[0118] 1. Digging the First Hole

[0119] Measure and lay out to determine the center position of the base station tower and the center position of each tower leg of the base station tower.

[0120] According to the set pipe pile arrangement plan, the position of each first hole is measured at the center of the tower leg and effectively marked.

[0121] At the location of each first hole, a Luoyang shovel or a micro drill is used to rotate and vertically drill in the soil layer. The diameter of the hole is equal to or greater than the diameter of the annular tube by 10mm to 15mm. The position of the first hole is allowed to deviate by 50mm, and the verticality of the hole is allowed to deviate by 1%. After the hole is drilled to the top surface of the rock layer, continue to drill downward for 100mm to 300mm, stop drilling the soil layer, clean the first hole, and protect the hole mouth of the first hole.

[0122] 2. Dig the second hole and set the annular tube and fixed reinforcement

[0123] The annular tube is lowered into the first hole for fixing, and the annular tube is kept vertical in the first hole, with an allowable deviation of 1% in straightness.

[0124] With the center of the annular tube hole as the center position, an anchor drill is used to drill vertically into the rock layer below the soil layer to form a second hole.

[0125] Clean each second hole and lower the fixing rib into the second hole.

[0126] According to the designed arrangement of pipe piles, the positions of the anchors and fixing bolts of the fixing bars as well as their spacing, center positions and dimensions are reviewed.

[0127] 3. First grouting

[0128] Pour concrete with a strength of not less than C30 into the second hole and the annular tube in layers of 300mm to 500mm, and vibrate and compact it to form a Figure 5 The pipe pile shown in the figure. Among them, the crushed stone particle size of fine stone concrete is 5mm to 15mm, and the fine stone concrete should be mixed with an appropriate amount of expansion agent. The recommended amount of expansion agent is 3% to 5% of the cement dosage, and the strength grade of the fine stone concrete after adding the expansion agent should still reach C30.

[0129] PO42.5 grade cement is used to make pure cement slurry with a water-cement ratio of 0.45, and an appropriate amount of early strength agent is added.

[0130] Use the upper thread of the grouting pipe to install the grouting nozzle and set the valve.

[0131] After the fine stone concrete has initially set for 2 to 4 hours, the first grouting of each pipe pile is carried out. The pressure of the first grouting should be controlled at 0.8 MPa to 1.0 MPa. When the volume of the injected cement slurry reaches 2 times the volume of the grouting pipe, the first grouting of the pipe pile is completed.

[0132] 4. Second grouting

[0133] After the first grouting of all pipe piles is completed, the second grouting of the pipe piles is carried out. The pressure of the second grouting should be controlled above 1.5MPa. When the total volume of the injected cement slurry reaches 3 times the volume of the grouting pipe and there is cement slurry overflowing from the hole, the second grouting of the pipe pile is completed. Figure 6 shown.

[0134] 5. Casting of the foundation

[0135] According to the requirements of the design drawings, the fixing reinforcement of the foundation and the support formwork for concrete pouring are fixed.

[0136] The center position of the pipe piles, the position and spacing of the fixing bolts are reviewed. Once the results are correct, the foundation concrete is poured in accordance with the design concrete strength grade requirements.

[0137] After the pouring of the pedestal concrete is completed, the top surface of the pedestal is smoothed and the fixing bolts are protected.

[0138] After the concrete solidifies for 5 to 7 days, remove the concrete support formwork of the pedestal.

[0139] After backfilling and compacting the foundation pit and leveling the site, complete the pipe pile construction.

[0140] The pipe piles in the embodiment of the present invention include an annular pipe located in the soil layer and fixed ribs in the rock layer, which can achieve the bearing performance of two units of pipe piles in the soil layer and pipe piles in the rock layer, and can better adapt to the binary stratum distribution characteristics of "upper soil and lower rock" of the transmission line tower foundation.

[0141] Among them, the first grouting and the second grouting are high pressure. The effect of high pressure grouting is mainly reflected in two aspects: one is to fill the gap between the annular tube and the soil layer, and the other is to increase the side resistance and end resistance of the annular tube by infiltrating (coarse-grained soil), splitting (fine-grained soil) and compacting (unsaturated loose soil) the soil layer within a certain range of the bottom and side wall of the annular tube. Generally, the bearing capacity of the single pile foundation can be increased by 40% and the pile bottom settlement can be reduced by 30%. The bearing capacity of different soil layers is strengthened differently, such as Fig.13 As shown in the figure, the increase in bearing capacity and decrease in settlement of sandy soil are greater than those of clay soil.

[0142] In addition, the spacing between different pipe piles is generally small. Grouting can effectively improve the bearing capacity of the soil layer between different pipe piles and its surroundings, thereby significantly improving the safety and reliability of the transmission line foundation.

[0143] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0144] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A pipe pile, characterized in that: include: An annular tube, wherein the annular tube is provided with a plurality of first through holes, and the plurality of first through holes are arranged along the axial direction of the annular tube; A fixing rib, wherein a first region of the fixing rib is located in the annular tube, the first region is adjacent to a second region of the fixing rib, an axis of the fixing rib coincides with an axis of the annular tube, and an interior of the annular tube and an outer periphery of the fixing rib form a hollow structure; During the installation of the pipe piles, the first area of ​​the annular tube and the fixing bars are located in a first hole in the soil layer, and the second area of ​​the fixing bars is located in a second hole in the rock layer below the soil layer level. The diameter of the second hole is smaller than the diameter of the first hole. The first hole and the second hole are used for grouting and fixing the annular tube and the fixing bars.

2. The pipe pile according to claim 1, characterized in that: Also includes at least one grouting pipe, the grouting pipe is fixed to the inner side of the annular pipe; The annular tube is provided with a plurality of second through holes, and the grouting tube is provided with a plurality of third through holes on one side close to the annular tube, one of the plurality of second through holes is connected with one of the plurality of third through holes, the second through holes are arranged along the axial direction of the annular tube, and the third through holes are arranged along the axial direction of the grouting tube; A plurality of fourth through holes are provided on one side of the grouting pipe away from the annular pipe, and the fourth through holes are arranged along the axial direction of the grouting pipe; During the installation of the pipe pile, the grouting pipe is used to perform secondary grouting on the first hole located in the soil layer to strengthen the fixation of the annular pipe and the fixing ribs.

3. The pipe pile according to claim 2, characterized in that: Each of the plurality of first through holes is provided with a first rubber plug, and the size of the first rubber plug is adapted to the size of each of the first through holes; and / or, Each of the plurality of second through holes is provided with a second rubber plug, and the size of the second rubber plug is adapted to the size of each of the second through holes; and / or, Each of the plurality of third through holes is provided with a third rubber plug, and the size of the third rubber plug is adapted to the size of each of the third through holes; and / or, Each of the plurality of fourth through holes is provided with a fourth rubber plug, and a size of the fourth rubber plug is adapted to a size of each of the fourth through holes.

4. The pipe pile according to claim 2, characterized in that: An outer side of one end of the grouting pipe away from the second region of the fixing rib is provided with an external thread.

5. The pipe pile according to claim 2, characterized in that: The length of the grouting pipe along the axial direction is adapted to the length of the annular pipe along the axial direction.

6. The pipe pile according to claim 1, characterized in that: The plurality of first through holes are arranged to form at least two rows of first through holes, each row of first through holes is distributed along the axis of the annular tube, and each row of first through holes is evenly distributed on the outer circumference of the annular tube.

7. The pipe pile according to claim 1, characterized in that: At least two anchoring members are disposed at one end of the fixing rib away from the first region, and the at least two anchoring members are evenly distributed around the periphery of the fixing rib.

8. The pipe pile according to claim 1, characterized in that: A fixing bolt is disposed at one end of the fixing rib away from the second area.

9. A method for installing a pipe pile, used for installing a pipe pile according to any one of claims 1 to 8, characterized in that: include: digging a first hole in a soil layer until a rock layer below the level of the soil layer is reached; Fixing the annular tube in the first hole; Excavating the rock layer with the axis of the annular tube as the center to form a second hole, wherein the diameter of the second hole is smaller than the diameter of the first hole; Fixing the second area of ​​the fixing rib in the second hole; The first holes and the second holes are grouted for the first time through the plurality of first through holes of the annular tube to strengthen the fixation of the annular tube and the fixing ribs.

10. The method according to claim 9, characterized in that After the first grouting is performed on the first hole and the second hole through the plurality of first through holes of the annular tube, the method further comprises: After the first grouting is finished after a set first time, a second grouting is performed into the first hole through the plurality of second through holes of the annular tube, the plurality of third through holes and the plurality of fourth through holes of the grouting tube.

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