Combined pipe pile

Abstract

The invention provides a combined pipe pile which comprises a stand column, a plurality of first fixing ribs and a plurality of second fixing ribs are arranged in the stand column and perpendicularly connected to form a first fixing net, the first end of the stand column is used for fixing a tower foot of a base station tower, and the second end of the stand column is used for fixing a second fixing net. The first fixing net is used for bearing part of radial stress and part of axial stress of the stand column. The second end of the stand column is fixedly connected with the first surface of the bottom table, the orthographic projection of the stand column is located in the first surface, a plurality of third fixing ribs and a plurality of fourth fixing ribs are arranged in the bottom table, and the third fixing ribs and the fourth fixing ribs are perpendicularly connected to form a second fixing net. The second fixing net is used for bearing part of radial stress and part of axial stress of the bottom table; and the single pipe pile is fixedly connected with the second surface of the bottom table, the orthographic projection of the single pipe pile is in the second surface, and the single pipe pile is used for being buried in a soil layer to a set depth so as to bear the radial stress and the axial stress of the combined pipe pile.

Description

Technical Field

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

[0002] A common way to install overhead wires is to install pipe piles underground and then install the base station tower's feet on the pipe piles. Specifically, the pipe piles need to be installed in the soil layer to a set depth to achieve stable installation of the base station tower. In related technologies, the soil layer in mountainous or hilly areas is shallow and cannot meet the requirements of installation to a set depth in the soil layer. Pipe piles need to be installed in the rock layer under the soil layer. However, in related technologies, since the rock layer is relatively hard, it takes a long time to drill holes in the rock layer to install the pipe piles, which consumes a lot of time and results in low installation efficiency of the 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 embodiment of the present invention provides a combined pipe pile to solve the problem of low installation efficiency of pipe piles in the related art.

[0005] In order to achieve the above object, an embodiment of the present invention provides a combined pipe pile, comprising:

[0006] A column, wherein a plurality of first fixing ribs and a plurality of second fixing ribs are arranged in the column, the plurality of first fixing ribs and the plurality of second fixing ribs are vertically connected to form a first fixing net, the first end of the column is used to fix the tower foot of the base station tower, and the first fixing net is used to bear part of the radial stress and part of the axial stress of the column;

[0007] A base, wherein the second end of the column is fixedly connected to the first surface of the base, the orthographic projection of the column is within the first surface, a plurality of third fixing ribs and a plurality of fourth fixing ribs are arranged within the base, the plurality of third fixing ribs and the plurality of fourth fixing ribs are vertically connected to form a second fixing net, the base is used to expand the radial cross-sectional area of ​​the combined pipe pile, and the second fixing net is used to bear part of the radial stress and part of the axial stress of the base;

[0008] At least one single-tube pile, the single-tube pile is fixedly connected to the second surface of the base, the orthographic projection of the single-tube pile is within the second surface, the first surface and the second surface are opposite to each other, and the single-tube pile is used to be buried in the soil layer to a set depth to bear the radial stress and axial stress of the combined tube pile;

[0009] In the process of installing the combined pipe piles, the bottom of the single pipe pile is arranged at the interface between the soil layer and the rock layer, and the second end of the column and the base platform are arranged in the soil layer, so as to bear the radial stress and axial stress generated by the tower foot of the base station tower through the column, the base platform and the single pipe pile.

[0010] In one embodiment, it further comprises a plurality of first anchoring bars, the plurality of first anchoring bars being used to anchor the position of the tower foot of the base station tower, the first region of each first anchoring bar being fixed to the first end of the column, and the first region of each first anchoring bar being provided with an external thread;

[0011] The second region of each first anchoring rib extends to the interior of the column, the axis of each first anchoring rib is parallel to the axis of the column, and the first region and the second region of each first anchoring rib are adjacent.

[0012] In one embodiment, the single-tube pile includes a first pile body, the first pile body includes an annular tube, the outer periphery of the annular tube is fixed to the second surface of the base, the third area of ​​the annular tube is located inside the base, the fourth area of ​​the annular tube is provided with at least one first through hole, and the third area is adjacent to the fourth area;

[0013] In the process of installing the combined pipe pile, the annular tube is placed in a first hole in the soil layer, and grout is poured into the annular tube to form the first pile body, which is used to fix the combined pipe pile to the soil layer to bear the radial stress and axial stress generated by the tower foot of the base station tower.

[0014] In one embodiment, the annular tube is provided with at least one second through hole, and the inner wall of the annular tube is provided with a grouting pipe;

[0015] At least one third through hole is provided on a side of the grouting pipe close to the annular pipe, and the second through hole is communicated with the third through hole.

[0016] In one embodiment, at least one fourth through hole is provided on a side of the grouting pipe away from the annular pipe.

[0017] In one embodiment, the first through holes are evenly distributed in the axial direction of the annular tube; and / or,

[0018] The second through holes are evenly distributed in the axial direction of the annular tube, and the third through holes are evenly distributed in the axial direction of the annular tube; and / or,

[0019] The fourth through holes are evenly distributed in the axial direction of the annular tube.

[0020] In one embodiment, the single-tube pile further includes a second pile body, the second pile body and the first pile body form an integral structure, and the axis of the first pile body coincides with the axis of the second pile body;

[0021] In the process of installing the combined pipe pile, a second hole is drilled in the rock layer below the level of the soil layer, the second hole is smaller than the first hole, and grouting is performed into the second hole to form the second pile body, which is used to enhance the radial and axial bearing of the single pipe pile in the rock layer.

[0022] In one embodiment, the single-tube pile further includes a second anchor rib, which is arranged at the axial position of the single-tube pile, wherein the fifth region of the second anchor rib is arranged at the axial position of the first pile body, and the sixth region of the second anchor rib is arranged at the axial position of the second pile body, the fifth region and the sixth region are adjacent, and the second anchor rib is used to enhance the axial bearing of the single-tube pile.

[0023] In one embodiment, at least one anchor is provided at the first end of the second anchor bar, and / or at least one anchor is provided at the second end of the second anchor bar, and the anchor is used to fix the second anchor bar at a set position in the monotube pile.

[0024] In one embodiment, when the second anchoring bar is provided with a plurality of anchors, the plurality of anchors are evenly distributed on the periphery of the second anchoring bar.

[0025] One of the above technical solutions has the following advantages or beneficial effects:

[0026] In an embodiment of the present invention, a combined pipe pile is provided, comprising: a column, a plurality of first fixing ribs and a plurality of second fixing ribs are arranged in the column, the plurality of first fixing ribs and the plurality of second fixing ribs are vertically connected to form a first fixing net, the first end of the column is used to fix the tower foot of the base station tower, and the first fixing net is used to bear part of the radial stress and part of the axial stress of the column; a base, the second end of the column is fixedly connected to the first surface of the base, the orthographic projection of the column is in the first surface, a plurality of third fixing ribs and a plurality of fourth fixing ribs are arranged in the base, the plurality of third fixing ribs and the plurality of fourth fixing ribs are vertically connected to form a second fixing net, the base is used to expand the radial cross-sectional area of ​​the combined pipe pile, and the second fixing net is used to bear part of the radial stress and part of the axial stress of the base, so as to increase the stress bearing capacity of the combined pipe pile through the base; at least one single pipe pile, the single pipe pile is fixedly connected to the second surface of the base, the orthographic projection of the single pipe pile is in the second surface, the first surface and the second surface are opposite, and the single pipe pile is used to be buried in the soil layer to a set depth to bear the radial stress and axial stress of the combined pipe pile. In this way, by setting a base and at least one single pipe pile in the combined pipe pile, the stress bearing capacity of the combined pipe pile is enhanced. When the depth of the soil layer does not meet the set depth of the single pipe pile, the radial stress and axial stress generated by the tower foot of the base station tower can also be carried. There is no need to drill holes in the rock layer, thereby improving the installation efficiency of the pipe pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 It is a structural schematic diagram of a combined pipe pile provided by an embodiment of the present invention;

[0029] Figure 2 It is a structural schematic diagram of a column and a base provided by an embodiment of the present invention;

[0030] Figure 3 is a schematic structural diagram of an annular tube provided in an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of an annular pipe after the first grouting provided by an embodiment of the present invention;

[0032] Figure 5 is a schematic diagram of soil layers after the first grouting provided by an embodiment of the present invention;

[0033] Figure 6 is a schematic diagram of an annular pipe after the second grouting provided by an embodiment of the present invention;

[0034] Figure 7 is a schematic diagram of soil layers after the second grouting provided by an embodiment of the present invention;

[0035] Figure 8 is a schematic diagram of a second anchor bar provided in an embodiment of the present invention;

[0036] Fig. 9 It is a schematic diagram of the distribution of anchoring members provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0037] 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.

[0038] In the construction of power grids, the construction of base station towers is an important component. In the process of power grid construction, there is a need to build base stations in mountainous or hilly areas. Since the base station tower will be subjected to the tensile / compressive alternation of tensile stress and compressive stress, and it is also necessary to bear horizontal forces, the pipe piles bearing the base station tower need to be buried in the soil layer or rock layer. In the related art, when the thickness of the soil layer is less than 3m, the pipe piles need to be buried in the rock layer below the soil layer to meet the requirements of bearing stress; when the thickness of the soil layer is greater than 8m, only the pipe piles need to be buried in the soil layer, and the combination of the soil layer and the pipe piles can meet the requirements of bearing stress. However, for the interval where the thickness of the soil layer is greater than 3m and less than 8m, only setting the pipe piles in the soil layer cannot meet the requirements of bearing stress, and when the pipe piles are set in the rock layer, it is difficult to drill holes in the rock layer, and it is impossible to achieve rapid drilling, resulting in low installation efficiency of the pipe piles. Therefore, the embodiment of the present invention designs a combined pipe pile for the case where the thickness of the soil layer is greater than 3m and less than 8m, so as to effectively improve the installation efficiency.

[0039] like Figure 1 As shown, an embodiment of the present invention provides a combined pipe pile, comprising:

[0040] A column 10, wherein a plurality of first fixing ribs and a plurality of second fixing ribs are arranged in the column 10, wherein the plurality of first fixing ribs and the plurality of second fixing ribs are vertically connected to form a first fixing net 101, wherein a first end of the column 10 is used to fix a tower foot 40 of a base station tower, and the first fixing net 101 is used to bear part of the radial stress and part of the axial stress of the column 10;

[0041] A base 20, wherein the second end of the column 10 is fixedly connected to the first surface of the base 20, the orthographic projection of the column 10 is within the first surface, a plurality of third fixing ribs and a plurality of fourth fixing ribs are arranged within the base 20, the plurality of third fixing ribs and the plurality of fourth fixing ribs are vertically connected to form a second fixing net 201, the base 20 is used to expand the radial cross-sectional area of ​​the combined pipe pile, and the second fixing net 201 is used to bear part of the radial stress and part of the axial stress of the base 20;

[0042] At least one single-tube pile 30, the single-tube pile 30 is fixedly connected to the second surface of the base 20, the orthographic projection of the single-tube pile 30 is within the second surface, the first surface and the second surface are opposite to each other, and the single-tube pile 30 is used to be buried in the soil layer to a set depth to bear the radial stress and axial stress of the combined tube pile;

[0043] In the process of installing the combined pipe piles, the bottom of the single pipe pile 30 is set at the interface between the soil layer and the rock layer, and the second end of the column 10 and the base platform 20 are set in the soil layer, so as to bear the radial stress and axial stress generated by the tower foot 40 of the base station tower through the column 10, the base platform 20 and the single pipe pile 30.

[0044] The above-mentioned column 10 is used to be directly fixed to the tower foot 40 of the base station tower, wherein a partial area of ​​the column 10 is located in the soil layer (that is, the second end of the column 10 is located in the soil layer), and another part of the column 10 is located above the soil layer (that is, the first end of the column 10 is located above the soil layer), and is fixed to the tower foot 40 of the base station tower through the first end of the column 10.

[0045] It should be understood that the tower foot 40 of the base station tower is provided with a fixing plate 41, and the fixing plate 41 is fixedly connected to the first end of the column 10. Figure 2 As shown, the area of ​​the first end of the column 10 is larger than the area of ​​the fixing plate 41. After the fixing plate 41 is fixed to the first end of the column 10, the fixing plate 41 is completely within the shape of the first end of the column 10, so that the tower foot 40 of the base station tower can evenly transfer radial stress and axial stress to the combined pipe pile to avoid damage caused by stress concentration.

[0046] The above-mentioned multiple first fixing ribs and multiple second fixing ribs form a first fixing net 101, and the shape of the first fixing net 101 is adapted to the shape of the column 10. For example, the shape of the column 10 is cylindrical or rectangular, and the shape of the first fixing net 101 is an annular structure or a columnar structure, so that when the first fixing net 101 is set in the column 10, it can withstand part of the radial stress and axial stress of the column 10, thereby increasing the stress bearing capacity of the column 10.

[0047] The above-mentioned base 20 is a columnar structure that is completely set in the soil layer. The cross-sectional area of ​​the base 20 is larger than the cross-sectional area of ​​the column 10. The area of ​​the base 20 contacting the soil layer is larger. Compared with the column 10, it can further improve the stress bearing capacity of the combined pipe pile, including the stress bearing capacity in the radial direction and the stress bearing capacity in the axial direction.

[0048] Furthermore, the base 20 is also provided with a second fixed net 201 formed by a plurality of third fixed ribs and a plurality of fourth fixed ribs. The second fixed net 201 is similar to the first fixed net 101 and may be an annular structure or a columnar structure, so that when the second fixed net 201 is arranged in the base 20, it can withstand part of the radial stress and axial stress of the base 20, thereby increasing the stress bearing capacity of the base 20.

[0049] Among them, when the base 20 is connected to only one single pipe pile 30, the base 20 in the embodiment of the present invention can enhance the stress bearing capacity of the combined pipe pile in the soil layer, so that when the thickness of the soil layer is less than 8m, it is only necessary to bury the single pipe pile 30 in the soil layer to meet the bearing stress requirement. For example, the thickness of the soil layer is 7.5m, and the combined pipe pile includes a single pipe pile 30, the base 20 and the column 10. At this time, it is only necessary to set the single pipe pile 30 in the soil layer to achieve the stress bearing capacity of the pipe pile without the base 20 in the related art, and it is not necessary to drill holes in the rock layer, thereby improving the installation efficiency.

[0050] Among them, the first fixing bar, the second fixing bar, the third fixing bar and the fourth fixing bar are large-diameter high-strength steel bars of HRB400 and above and with a diameter of 32mm to 40mm.

[0051] The above-mentioned single-tube pile 30 is used to be buried in the soil layer. By burying the single-tube pile 30 to a set depth, the single-tube pile 30 and the soil layer work together to bear the radial stress and axial stress generated by the tower foot 40 of the base station tower. Among them, the single-tube pile 30 can be one or more, and the specific number is set according to the depth of the soil layer. By increasing the number of single-tube piles 30 to enhance the stress bearing capacity of the combined pipe pile, the radial stress and axial stress generated by the tower foot 40 of the base station tower can be carried.

[0052] For example, the thickness of the soil layer is 6.5m, and the combined pipe piles include multiple single pipe piles 30, a base 20 and columns 10. By burying multiple single pipe piles 30 in the soil layer, the stress bearing capacity of the pipe piles in the relevant technology can be achieved, and there is no need to drill holes in the rock layer, thereby improving the installation efficiency.

[0053] Furthermore, when the combined pipe pile is provided with a plurality of single pipe piles 30, the single pipe piles 30 are evenly distributed on the second surface of the base 20. Figure 2As shown, the composite pipe pile includes nine single pipe piles 30, and the nine single pipe piles 30 are distributed in a 3×3 pattern on the second surface of the base 20, so as to evenly share the stress.

[0054] In an embodiment of the present invention, a combined pipe pile is provided, including: a column 10, a plurality of first fixing ribs and a plurality of second fixing ribs are arranged in the column 10, the plurality of first fixing ribs and the plurality of second fixing ribs are vertically connected to form a first fixing net 101, a first end of the column 10 is used to fix the tower foot 40 of the base station tower, and the first fixing net 101 is used to bear part of the radial stress and part of the axial stress of the column 10; a base 20, a second end of the column 10 is fixedly connected to a first surface of the base 20, an orthographic projection of the column 10 is within the first surface, a plurality of third fixing ribs and a plurality of fourth fixing ribs are arranged in the base 20, and the plurality of A third fixing rib and a plurality of fourth fixing ribs are vertically connected to form a second fixing net 201. The base 20 is used to expand the radial cross-sectional area of ​​the combined pipe pile. The second fixing net 201 is used to bear part of the radial stress and part of the axial stress of the base 20, so as to increase the stress bearing capacity of the combined pipe pile through the base 20. At least one single pipe pile 30 is fixedly connected to the second surface of the base 20. The positive projection of the single pipe pile 30 is within the second surface. The first surface and the second surface are opposite. The single pipe pile 30 is used to be buried in the soil layer to a set depth to bear the radial stress and axial stress of the combined pipe pile. In this way, by setting the base 20 and at least one single pipe pile 30 in the combined pipe pile, the stress bearing capacity of the combined pipe pile is enhanced. When the depth of the soil layer does not meet the set depth of the single pipe pile 30, the radial stress and axial stress generated by the tower foot 40 of the base station tower can also be borne. There is no need to drill holes in the rock layer, thereby improving the installation efficiency of the pipe pile.

[0055] In one embodiment, it further includes a plurality of first anchoring bars 102, which are used to anchor the position of the tower foot 40 of the base station tower, and the first area of ​​each first anchoring bar 102 is fixed to the first end of the column 10, and the first area of ​​each first anchoring bar 102 is provided with an external thread;

[0056] The second region of each first anchoring rib 102 extends to the interior of the column 10 , the axis of each first anchoring rib 102 is parallel to the axis of the column 10 , and the first region and the second region of each first anchoring rib 102 are adjacent.

[0057] The first anchoring bar 102 is used to anchor the position of the tower foot 40 of the base station tower, and the tower foot 40 of the base station tower is fixed to the first end of the column 10 through the external thread of the first anchoring bar 102. At the same time, the direction of the first anchoring bar 102 is parallel to the axial direction of the column 10, and the stress generated by anchoring the tower foot 40 of the base station tower can be uniformly transferred to the combined pipe pile by arranging a plurality of second areas of the first anchoring bars 102, so that the radial stress and axial stress generated by the tower foot 40 of the base station tower can be carried by the combined pipe pile.

[0058] The number of the first anchoring bars 102 matches the number of mounting holes provided on the tower foot 40 of the base station tower, and the tower foot 40 and the column 10 of the base station tower are fixed by the first anchoring bars 102 and the mounting holes.

[0059] In an embodiment of the present invention, the combined pipe pile further includes a plurality of first anchoring ribs 102, which are used to anchor the position of the tower foot 40 of the base station tower. The first region of each first anchoring rib 102 is fixed to the first end of the column 10, and the first region of each first anchoring rib 102 is provided with an external thread so that the first region of the first anchoring rib 102 is fixed to the column 10; at the same time, the second region of each first anchoring rib 102 extends to the interior of the column 10, the axis of each first anchoring rib 102 is parallel to the axis of the column 10, and the first region and the second region of each first anchoring rib 102 are adjacent to each other, so as to evenly transfer the stress generated by anchoring the tower foot 40 of the base station tower to the combined pipe pile, thereby realizing the radial stress and axial stress generated by the tower foot 40 of the base station tower being carried by the combined pipe pile.

[0060] In one embodiment, the single-tube pile 30 includes a first pile body, the first pile body includes an annular tube 301, the outer periphery of the annular tube 301 is fixed to the second surface of the base 20, the third area of ​​the annular tube 301 is located in the base 20, the fourth area of ​​the annular tube 301 is provided with at least one first through hole 3011, and the third area is adjacent to the fourth area;

[0061] In the process of installing the combined pipe pile, the annular tube 301 is placed in the first hole of the soil layer, and grouting is poured into the annular tube 301 to form the first pile body, which is used to fix the combined pipe pile to the soil layer to bear the radial stress and axial stress generated by the tower foot 40 of the base station tower.

[0062] The annular tube 301 is used to be placed in the soil layer, and the first pile body is formed by grouting into the annular tube 301. Among them, at least one first through hole 3011 in the annular tube 301 can disperse the grout during grouting into the soil layer to enhance the stress bearing capacity of the soil layer.

[0063] Among them, the first area of ​​the annular tube 301 is located inside the base 20, and there is no need to set the first through hole 3011. Instead, the first pile body and the base 20 form an integrated structure during grouting. At the same time, the base 20 and the column 10 are also an integrated structure, so that the combined pipe pile can bear the radial stress and axial stress generated by the tower foot 40 of the base station tower.

[0064] The diameter d1 of the annular tube 301 is 219 mm to 73 mm, and the length of the annular tube 301 is 300 mm to 500 mm.

[0065] Furthermore, in order to allow the soil layer to be uniformly permeated with grout during grouting, the first through holes 3011 are uniformly distributed in the fourth region. For example, the first through holes 3011 are distributed along the axis of the first pile body in the fourth region, and the intervals between each first through hole 3011 are the same, so as to achieve uniform permeation of grout into the soil layer. The aperture of the first through hole 3011 is 25 mm to 30 mm, and the hole spacing d2 between the first through holes 3011 is 500 mm.

[0066] In the process of installing the combined pipe pile, the annular tube 301 is placed in the first hole of the soil layer, and grouting is poured into the annular tube 301 to form a first pile body. The first pile body is used to fix the combined pipe pile to the soil layer to bear the radial stress and axial stress generated by the tower foot 40 of the base station tower.

[0067] In an embodiment of the present invention, the single-tube pile 30 includes a first pile body, the first pile body includes an annular tube 301, the outer periphery of the annular tube 301 is fixed to the second surface of the base 20, the third area of ​​the annular tube 301 is located in the base 20, and the fourth area of ​​the annular tube 301 is provided with at least one first through hole 3011. The third area and the fourth area are adjacent to each other, and the slurry is evenly penetrated into the soil layer through the first through hole 3011 to enhance the stress bearing capacity of the soil layer.

[0068] In one embodiment, the annular tube 301 is provided with at least one second through hole, and the inner wall of the annular tube 301 is provided with a grouting tube 311;

[0069] At least one third through hole 3111 is provided on one side of the grouting pipe 311 close to the annular pipe 301 , and the second through hole is communicated with the third through hole 3111 .

[0070] The second through hole and the third through hole 3111 are connected, and the second grouting is performed into the soil layer through the second through hole and the third through hole 3111. It should be understood that the process of grouting directly into the annular tube 301 is the first grouting, and the grouting for the first time uses a slurry with larger particles, such as fine stone concrete. After the fine stone concrete is filled in the annular tube 301, there are still gaps in the fine stone concrete, and it is necessary to fill the pure cement slurry through the grouting pipe 311 for the second grouting to further improve the strength of the first pile body. At this time, since the fine stone concrete during the first grouting is also infiltrated into the soil layer, the second grouting is performed into the soil layer through the second through hole and the third through hole 3111, which can further improve the strength of the soil layer. Among them, the crushed stone particle size of the fine stone concrete is 5mm~15m, and the fine stone concrete should be mixed with an appropriate amount of expansion agent. The recommended amount of expansion agent is 3%~5% of the cement dosage, and the concrete strength grade after the expansion agent is added should still reach C30.

[0071] The second through holes are evenly distributed on the annular tube 301, and the position of the third through hole 3111 corresponds to the position of the second through hole, so that the grout of the second grouting can penetrate into the soil layer through the second through hole and the third through hole 3111. The diameters of the second through hole and the third through hole 3111 are 15 mm to 25 mm, the hole spacing between each second through hole is 500 mm, and the hole spacing between each third through hole 3111 is d3500 mm.

[0072] like Figure 3 As shown, the above-mentioned grouting pipe 311 can be directly fixed on the inner wall of the annular pipe 301, and the second grouting is performed to the soil layer through the second through hole and the third through hole 3111, or the annular pipe 301 can be split into two semi-rings, and the grouting pipe 311 is arranged between the two semi-rings, so that the second grouting can be performed directly to the soil layer through the third through hole 3111 on the grouting pipe 311.

[0073] The diameter d4 of the grouting pipe 311 is 5 mm to 30 mm, and the grouting pipe 311 is 300 mm to 350 mm longer than the annular pipe 301 . An external thread is provided on the outer wall of the 300 mm to 350 mm grouting pipe 311 to fix the second grouting equipment.

[0074] like Figure 4 and Figure 5 As shown, after the first grouting, the single pipe pile 30 is formed as shown in FIG. Figure 4 The structure of the soil layer is as follows: Figure 5 as shown; Figure 6 and Figure 7 As shown, after the second grouting, the single pipe pile 30 is formed as shown in FIG. Figure 6 The structure of the soil layer is as follows: Figure 7As shown, at this time, the penetration range is wider, which can further improve the strength of the soil layer, that is, grouting is performed into the soil layer through the second through hole and the third through hole 3111 to improve the strength of the soil layer.

[0075] In the embodiment of the present invention, the annular tube 301 is provided with at least one second through hole, the inner wall of the annular tube 301 is provided with a grouting pipe 311, and the side of the grouting pipe 311 close to the annular tube 301 is provided with at least one third through hole 3111, the second through hole is connected to the third through hole 3111, and the slurry of the second grouting is infiltrated into the soil layer through the third through hole 3111 and the fourth through hole, which can further improve the strength of the soil layer.

[0076] In one embodiment, at least one fourth through hole is provided on a side of the grouting pipe 311 away from the annular pipe 301 .

[0077] The fourth through hole is used to allow the slurry in the grouting pipe 311 to penetrate into the annular pipe 301, so as to achieve the second grouting in the annular pipe 301, thereby improving the structural strength of the first pile body.

[0078] In one embodiment, the first through holes 3011 are evenly distributed in the axial direction of the annular tube 301; and / or,

[0079] The second through holes are evenly distributed in the axial direction of the annular tube 301, and the third through holes 3111 are evenly distributed in the axial direction of the annular tube 301; and / or,

[0080] The fourth through holes are evenly distributed in the axial direction of the annular tube 301 .

[0081] It should be understood that in order to allow the first grouting to penetrate evenly into the soil layer, the first through holes 3011 are evenly distributed on the axis of the annular tube 301, and the spacing between each first through hole 3011 is the same, so that the slurry during the first grouting can penetrate evenly into the soil layer through the first through holes 3011 to increase the strength of the soil layer.

[0082] Similarly, the second through holes are arranged to be evenly distributed in the axial direction of the annular tube 301, and the third through holes 3111 are evenly distributed in the axial direction of the annular tube 301, the spacing between each second through hole is the same, and the spacing between each third through hole 3111 is the same, so that the slurry during the second grouting can penetrate into the soil layer evenly through the second through holes and the third through holes 3111 to improve the strength of the soil layer.

[0083] Similarly, the fourth through holes are evenly distributed in the axial direction of the annular tube 301, so that the grout during the second grouting can evenly penetrate into the annular tube 301 through the fourth through holes to improve the strength of the first pile body.

[0084] In one embodiment, the single-tube pile 30 further includes a second pile body 302, wherein the second pile body 302 and the first pile body form an integral structure, and the axis of the first pile body coincides with the axis of the second pile body 302;

[0085] In the process of installing the combined pipe pile, a second hole is drilled in the rock layer below the level of the soil layer, the second hole is smaller than the first hole, and grouting is performed into the second hole to form the second pile body 302, which is used to enhance the radial and axial bearing of the single pipe pile 30 in the rock layer.

[0086] The second pile body 302 is a pile body arranged in the rock layer, and is used to further enhance the stress bearing capacity of the combined pipe pile. It should be understood that, when the thickness of the soil layer is thin, only arranging the first pile body in the soil layer cannot meet the bearing stress requirement, and the single pipe pile 30 needs to be further buried in the rock layer to enhance the stress bearing capacity of the combined pipe pile.

[0087] The diameter of the second pile body 302 in the rock layer is smaller than the diameter of the first pile body, so as to reduce the diameter of the second hole for placing the second pile body 302, thereby reducing the difficulty of drilling and improving the efficiency of installation. It should be understood that since the hardness of the rock layer is higher than that of the soil layer, the use of a second pile body 302 with a smaller diameter can also meet the bearing stress requirements.

[0088] Specifically, before the first grouting, a second hole is drilled in the rock layer, a first hole is drilled in the soil layer, and an annular tube 301 is placed in the first hole; during the first grouting process, grouting is performed in the annular tube 301, so that the annular tube 301 and the second hole are both filled with slurry, thereby forming a first pile body and a second pile body 302, and the first pile body and the second pile body 302 are an integrated structure. The axis of the first pile body coincides with the axis of the second pile body 302, so that the first pile body and the second pile body 302 can evenly bear stress and avoid damage caused by stress concentration.

[0089] Among them, the second pile body 302 only needs to be formed by the first grouting, and the strength meets the bearing requirements, and there is no need for a second grouting. In this case, the grouting pipe 311 only needs to be set inside the annular pipe 301, and there is no need to extend the grouting pipe 311 to the second hole, thereby reducing material consumption.

[0090] In the embodiment of the present invention, the single pipe pile 30 further includes a second pile body 302, the second pile body 302 and the first pile body form an integral structure, the axis of the first pile body coincides with the axis of the second pile body 302, and the stress bearing capacity of the combined pipe pile is further improved by setting the second pile body 302 in the rock layer. At the same time, the diameter of the second pile body 302 in the rock layer is smaller than the diameter of the first pile body, so as to reduce the diameter of the second hole for placing the second pile body 302, thereby reducing the difficulty of drilling and improving the efficiency of installation.

[0091] In one embodiment, the single-tube pile 30 also includes a second anchor rib 303, which is arranged at the axial position of the single-tube pile 30, wherein the fifth region of the second anchor rib 303 is arranged at the axial position of the first pile body, and the sixth region of the second anchor rib 303 is arranged at the axial position of the second pile body 302, the fifth region and the sixth region are adjacent, and the second anchor rib 303 is used to enhance the axial bearing of the single-tube pile 30.

[0092] The second anchoring bar 303 is arranged at the axial position of the single-tube pile 30, and is used to anchor the single-tube pile 30 to the soil layer or the rock layer. Specifically, in the process of installing the second anchoring bar 303, a first hole is firstly drilled in the soil layer to obtain a first hole, a second hole is drilled in the rock layer to obtain a second hole, and the annular tube 301 is placed in the first hole, and then the second anchoring bar 303 is anchored in the second hole to the axial position of the single-tube pile 30, and then the first grouting and the second grouting are performed to form the single-tube pile 30, so that the second anchoring bar 303 is located at the axial position of the single-tube pile 30.

[0093] The second anchor bar 303 is a steel bar structure. The second anchor bar 303 is arranged in the single-tube pile 30 , which can effectively improve the structural strength of the single-tube pile 30 , and further improve the bearing capacity of the axial stress of the single-tube pile 30 .

[0094] In an embodiment of the present invention, the single-tube pile 30 also includes a second anchor rib 303, which is arranged at the axial position of the single-tube pile 30, wherein the fifth region of the second anchor rib 303 is arranged at the axial position of the first pile body, and the sixth region of the second anchor rib 303 is arranged at the axial position of the second pile body 302, and the fifth region and the sixth region are adjacent to each other. The structural strength of the single-tube pile 30 is enhanced by the second anchor rib 303, thereby enhancing the bearing capacity of the axial stress of the single-tube pile 30.

[0095] In one embodiment, Figure 8 As shown, at least one anchor 3031 is provided at the first end of the second anchor bar 303, and / or at least one anchor 3031 is provided at the second end of the second anchor bar 303, and the anchor 3031 is used to fix the second anchor bar 303 at a set position in the single-tube pile 30.

[0096] The above-mentioned anchor 3031 is used to be fixed on the outer periphery of the second anchor bar 303 to increase the cross-sectional area of ​​the second anchor bar 303 at the first end and / or the second end, so that after the first grouting and the second grouting, the second anchor bar 303 can be effectively fixed on both ends of the single-tube pile 30, and the single-tube pile 30 can be installed at the drilling position of the soil layer and the rock layer.

[0097] Among them, the first end of the second anchor bar 303 is arranged in the rock layer, which is used to fix the single-tube pile 30 in the second hole of the rock layer; the second end of the second anchor bar 303 is arranged in the base 20, so as to set the single-tube pile 30 at the corresponding position of the base 20.

[0098] In one embodiment, when a plurality of anchors 3031 are provided on the second anchor rib 303, the plurality of anchors 3031 are evenly distributed on the periphery of the second anchor rib 303, so that after the single-tube pile 30 is formed, the second anchor rib 303 can be evenly stressed in different directions, thereby avoiding damage caused by stress concentration.

[0099] For example, Fig. 9 As shown, there are three anchors 3031 , and each anchor 3031 is distributed on the periphery with an angle of 120° between them.

[0100] In the embodiment of the present invention, the process of burying the combined pipe pile underground is as follows:

[0101] 1) Location determination

[0102] Measure and stake out to determine the center position of the base station tower and the center position of each tower foot;

[0103] At the center of the base station tower foot, excavate the foundation pit according to the designed dimensions;

[0104] The foundation pit soil is leveled, and according to the n×n square layout of the soil layer, the hole position of each single-tube pile is determined and effectively marked.

[0105] 2) Drilling

[0106] At the hole position of each single-tube pile, a hole is drilled in the soil layer, the diameter of the hole is equal to the diameter of the annular tube or is 10mm to 15mm larger than the diameter of the steel tube, the hole position is allowed to deviate by 50mm, and the verticality of the hole is allowed to deviate by 1%, to obtain the first hole;

[0107] Lower the annular tube into the first hole, fix it, and keep it vertical in the first hole. The verticality deviation is allowed to be 1%;

[0108] With the center of the first hole as the center position, drill vertically into the rock layer to form a second hole. The diameter of the second hole is 2 to 3 times the diameter of the second anchor bar, and should not be less than 90 mm or more than 150 mm.

[0109] 3) Install the second anchor bar

[0110] Clean each of the first holes and the second holes, and lower the second fixing bars into the second holes until all the second anchor bars are installed;

[0111] According to the layout plan, check the positions of all annular tubes and second anchor bars, and fix them effectively.

[0112] 4) Grouting

[0113] Pour fine stone concrete with a strength grade 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 single-tube pile, completing the first grouting;

[0114] Use PO42.5 grade cement to make pure cement slurry, the water-cement ratio of the cement slurry is 0.45, and add appropriate amount of early strength agent;

[0115] Use the grouting pipe to install the grouting nozzle and set the valve. After the fine stone concrete is initially set for 2h to 4h, each single-tube pile is grouted for the second time. The second grouting includes the first-stage grouting and the second-stage grouting. The pressure of the first-stage grouting should be controlled at 0.8MPa to 1.0MPa. When the volume of the injected cement slurry reaches 2 times the volume of the grouting pipe, the first-stage grouting of the corresponding single-tube pile is completed;

[0116] After the first stage grouting of all single-tube piles is completed, the second stage grouting of the single-tube piles is carried out, and the pressure of the second stage 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 cement slurry overflows from the orifice, the second stage pressure grouting of the corresponding single pile is completed.

[0117] 5) Installation of base and columns

[0118] The bottom of the foundation pit is compacted and leveled, and a concrete cushion is constructed with a thickness of 150mm to 200mm;

[0119] According to the design drawings, tie the base and column reinforcement of the column-slab structure, and install and fix the anchor bolts in place;

[0120] Support and fix the base and columns to form a concrete pouring formwork;

[0121] In accordance with the design concrete strength grade requirements, concrete is poured into the concrete casting formwork to form the base and columns.

[0122] 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.

[0123] 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 combined pipe pile, characterized in that: include: A column, wherein a plurality of first fixing ribs and a plurality of second fixing ribs are arranged in the column, the plurality of first fixing ribs and the plurality of second fixing ribs are vertically connected to form a first fixing net, the first end of the column is used to fix the tower foot of the base station tower, and the first fixing net is used to bear part of the radial stress and part of the axial stress of the column; A base, wherein the second end of the column is fixedly connected to the first surface of the base, the orthographic projection of the column is within the first surface, a plurality of third fixing ribs and a plurality of fourth fixing ribs are arranged within the base, the plurality of third fixing ribs and the plurality of fourth fixing ribs are vertically connected to form a second fixing net, the base is used to expand the radial cross-sectional area of ​​the combined pipe pile, and the second fixing net is used to bear part of the radial stress and part of the axial stress of the base; At least one single-tube pile, the single-tube pile is fixedly connected to the second surface of the base, the orthographic projection of the single-tube pile is within the second surface, the first surface and the second surface are opposite to each other, and the single-tube pile is used to be buried in the soil layer to a set depth to bear the radial stress and axial stress of the combined tube pile; In the process of installing the combined pipe piles, the bottom of the single pipe pile is arranged at the interface between the soil layer and the rock layer, and the second end of the column and the base platform are arranged in the soil layer, so as to bear the radial stress and axial stress generated by the tower foot of the base station tower through the column, the base platform and the single pipe pile.

2. The combined pipe pile according to claim 1, characterized in that: It also includes a plurality of first anchoring bars, which are used to anchor the position of the tower foot of the base station tower, and the first area of ​​each first anchoring bar is fixed to the first end of the column, and the first area of ​​each first anchoring bar is provided with an external thread; The second region of each first anchoring rib extends to the interior of the column, the axis of each first anchoring rib is parallel to the axis of the column, and the first region and the second region of each first anchoring rib are adjacent.

3. The combined pipe pile according to any one of claims 1 or 2, characterized in that: The single-tube pile comprises a first pile body, the first pile body comprises an annular tube, the outer periphery of the annular tube is fixed to the second surface of the base, the third area of ​​the annular tube is located inside the base, the fourth area of ​​the annular tube is provided with at least one first through hole, and the third area is adjacent to the fourth area; In the process of installing the combined pipe pile, the annular tube is placed in a first hole in the soil layer, and grout is poured into the annular tube to form the first pile body, which is used to fix the combined pipe pile to the soil layer to bear the radial stress and axial stress generated by the tower foot of the base station tower.

4. The combined pipe pile according to claim 3, characterized in that: The annular tube is provided with at least one second through hole, and the inner wall of the annular tube is provided with a grouting pipe; At least one third through hole is provided on a side of the grouting pipe close to the annular pipe, and the second through hole is communicated with the third through hole.

5. The combined pipe pile according to claim 4, characterized in that: At least one fourth through hole is provided on a side of the grouting pipe away from the annular pipe.

6. The combined pipe pile according to claim 5, characterized in that: The first through holes are evenly distributed in the axial direction of the annular tube; and / or, The second through holes are evenly distributed in the axial direction of the annular tube, and the third through holes are evenly distributed in the axial direction of the annular tube; and / or, The fourth through holes are evenly distributed in the axial direction of the annular tube.

7. The combined pipe pile according to claim 3, characterized in that: The single-tube pile further includes a second pile body, the second pile body and the first pile body form an integral structure, and the axis of the first pile body coincides with the axis of the second pile body; In the process of installing the combined pipe pile, a second hole is drilled in the rock layer below the level of the soil layer, the second hole is smaller than the first hole, and grouting is performed into the second hole to form the second pile body, which is used to enhance the radial and axial bearing of the single pipe pile in the rock layer.

8. The combined pipe pile according to claim 7, characterized in that: The single-tube pile also includes a second anchor rib, which is arranged at the axial position of the single-tube pile, wherein the fifth area of ​​the second anchor rib is arranged at the axial position of the first pile body, and the sixth area of ​​the second anchor rib is arranged at the axial position of the second pile body, the fifth area and the sixth area are adjacent, and the second anchor rib is used to enhance the axial bearing of the single-tube pile.

9. The combined pipe pile according to claim 8, characterized in that: The first end of the second anchor bar is provided with at least one anchor, and / or the second end of the second anchor bar is provided with at least one anchor, and the anchor is used to fix the second anchor bar at a set position in the monotube pile.

10. The combined pipe pile according to claim 9, characterized in that: When the second anchoring bar is provided with a plurality of anchoring members, the plurality of anchoring members are evenly distributed on the periphery of the second anchoring bar.

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