Soft soil foundation pipe pile reinforcement device and construction method thereof

Abstract

The present invention relates to pile foundation engineering in building construction, and in particular to a pipe pile reinforcement device suitable for soft soil foundation and a construction method thereof. The device comprises a pipe pile with a cavity structure, a pile tip with a conical structure, a steel casing, a conveying member at the lower end of the pipe pile, a force transmission device, a first type of pipeline, a second type of pipeline, and a temporary support frame. Due to the use of the conveying member at the lower end of the pipe pile, a rod member for conveying concrete slurry which also serves as a skeleton is used, the distance of the concrete slurry conveyed around the pile is increased, the cross-sectional area of ​​the consolidated body is greatly increased, and the ability of the pile body to bear axial loads and horizontal loads is significantly improved. The assembly and construction process of the device is simple, and the operation is convenient. The force transmission device can be reused, the pile length is shortened or the number of pile sections is reduced, and the cost is saved.

Description

Technical Field

[0001] The invention relates to a pile foundation project of building construction, and in particular to a pipe pile reinforcement device suitable for soft soil foundation and a construction method thereof. Background Art

[0002] Soft soil refers to modern sediments that are mainly clay particles and accompanied by microbial action, which are deposited in a static or slow-flowing water environment. It is a fine-grained soil that is soft plastic to fluid plastic and mainly gray in appearance. It is widely distributed, mostly in places such as the seashore, river beaches, swamps, and lakes. The soft soil matrix has strong plasticity, is relatively soft, has a large porosity, high water content, and large settlement, so its bearing capacity will be relatively weak.

[0003] Concrete pipe piles are often used to reinforce soft soil foundations in bridges, roads, water conservancy and housing construction projects. According to the different stress conditions of the pile foundation in the soil, they can be divided into end-bearing piles and friction piles. End-bearing piles are a type of pile that penetrates the soft soil layer and reaches the deep solid soil. The upper structure load is mainly borne by the pile tip resistance; friction piles are a type of pile that is completely set at a certain depth in the soft soil layer. The upper structure load is borne by the pile tip resistance and the friction between the pile body side and the soil. The design calculation is generally based on the pile side friction, resulting in a longer pile length and a larger number of piles. In order to meet the requirements of the pile body slenderness ratio, a larger pile diameter is required. The static pressure and ramming method of pipe piles with larger pile diameters is complex, time-consuming, labor-intensive, and costly. In addition, the longer the pile and the larger the pile diameter, the greater the soil extrusion stress and excess pore water pressure between the piles, which will cause horizontal displacement or floating of adjacent piles, thereby affecting the pile quality and pile bearing capacity.

[0004] The prior art performs grouting treatment on the pile side or pile end. This technology is to inject curable slurry into the soil layer around the pile through a grouting pipe pre-buried in the pile body. These slurries work together through physical and chemical forms such as penetration, filling, replacement, splitting, compaction and consolidation to form a consolidated body of slurry and soil within a certain range around the pile, thereby changing the physical and mechanical properties of the soil near the pile, so that the resistance around the pile is improved to varying degrees, and the pile body is improved. However, the consolidated body can only be formed in the soil layer within a limited range around the pile and mainly bears compressive stress. There is no skeleton in the consolidated body, and the ability to bear tensile stress is limited. The bearing capacity of the pipe pile is determined by the area of ​​concrete or the consolidated body in its cross section. Therefore, increasing the cross-sectional area of ​​the consolidated body and adding a skeleton can significantly improve the bearing capacity of the pipe pile. Summary of the invention

[0005] In order to solve the technical problems existing in the background technology, the purpose of the present invention is to provide a pipe pile reinforcement device suitable for soft soil foundation and a construction method thereof.

[0006] The present invention is achieved in that:

[0007] The soft soil foundation pipe pile reinforcement device includes a pipe pile with a cavity structure, a pile tip with a conical structure, a steel casing, a conveying member at the lower end of the pipe pile, a force transmission device, a first type of pipeline, a second type of pipeline, and a temporary support frame.

[0008] The steel casing has a lower end fixedly connected to the pile tip, an upper end fixedly connected to the lower end surface of the pipe pile, and a side surface is provided with a plurality of semicircular holes evenly distributed along the circumferential direction.

[0009] The conveying member at the lower end of the pile comprises a rod and a connecting plate; the rod has multiple rods, the number of which is equal to the number of the semicircular holes of the steel casing, the head end is a pointed end, the tail end has a connecting ring, near the tail end there are a first connecting column and a second connecting column with a hollow structure, the rod has a first channel and a second channel that are not connected to each other, the surface of the rod has a plurality of first-type orifices and a plurality of second-type orifices, the first connecting column and each first-type orifice are interconnected through the first channel, and the second connecting column and each second-type orifice are interconnected through the second channel; the connecting plate is a coaxially arranged large disc with a plurality of grooves on the edge and a small disc with an external thread, the distribution pipe one and the distribution pipe two are embedded inside, the large disc and the small disc are The distribution pipe 1 and the distribution pipe 2 are an integrated structure, and a through circular hole is set in the center of the large disc and the small disc. The distribution pipe 1 includes an inlet 1 and multiple outlet 1s, and the distribution pipe 2 includes an inlet 2 and multiple outlet 2s. The number of outlet 1 and outlet 2 is equal to the number of the rod members, and each outlet extends out of the hole wall of the circular hole. The inlet 1 of the distribution pipe 1 and the inlet 2 of the distribution pipe 2 are symmetrically arranged on the upper top surface of the small disc, and the corresponding positions of the inlet 1 of the distribution pipe 1 and the inlet 2 of the distribution pipe 2 on the upper top surface of the small disc are respectively bonded with a kissing part 1 and a kissing part 2 made of flexible material; each of the grooves is fixedly connected to a shaft, and each shaft is rotatably connected to the connecting ring of one of the rod members by gap matching.

[0010] The force transmission device includes a barrel-shaped nut, a force transmission rod, and a tightening piece. The barrel-shaped nut opens downward, and an inner side wall is provided with an internal thread matching the external thread of the small disc. A kissing portion three and a kissing portion four are provided on the inner top surface. A third connecting column and a fourth connecting column of a hollow structure are fixedly connected at positions on the outer top surface corresponding to the kissing portions three and four on the inner top surface. The force transmission rod is composed of a reinforcing component with an isosceles trapezoidal longitudinal section and a long tube with a hollow channel therein. The reinforcing component is fixedly connected to the outer top surface of the barrel-shaped nut, and a cavity is provided in the reinforcing component. The bottom cross-section is a rectangle, and the center line of the long direction of the rectangle coincides with the center line connecting the kissing portion three and the kissing portion four. The third connecting column and the fourth connecting column are connected to the outer top surface of the barrel-shaped nut. The column is covered in the cavity of the reinforcing component, a large through hole is set at the top center position of the reinforcing component, the long tube is fixedly connected to the top of the reinforcing component, and the cavity of the reinforcing component is interconnected with the hollow channel of the long tube through the large through hole; the tightening piece has a regular hexagonal cross-sectional shape, is fixedly connected to the upper top end of the long tube of the force transmission rod, and a fifth connecting column and a sixth connecting column with a hollow structure are arranged side by side on the side wall of the long tube near the lower position of the tightening piece, and the fifth connecting column and the sixth connecting column both have one end extending into the side wall of the long tube and the other end extending out of the side wall of the long tube, and the other end extending out of the side wall of the long tube is connected to external equipment; the external equipment includes an air compressor, a vacuum device, and a high-pressure grouting machine.

[0011] The first type of pipeline includes section 1-1 pipe and section 1-2 pipe, and the second type of pipeline includes section 2-1 pipe and section 2-2 pipe. There are multiple sections 1-1 pipe and section 2-1 pipe, and the number of the sections is equal to the number of the rods.

[0012] The temporary support frame is made of fragile materials.

[0013] Furthermore, the diameter of the rod is smaller than the radius of the semicircular hole of the steel casing.

[0014] Furthermore, the kissing part 1, the kissing part 2, the kissing part 3, and the kissing part 4 have the same structure, equal size, and consistent shape, are all single-bevel wedge blocks, and a through hole is set at the center position. The kissing part 1 includes the single-bevel wedge block 1 and the through hole 1, the kissing part 2 includes the single-bevel wedge block 2 and the through hole 2, the kissing part 3 includes the single-bevel wedge block 3 and the through hole 3, and the kissing part 4 includes the single-bevel wedge block 4 and the through hole 4. When bonding, the single-bevel wedge block 1 of the kissing part 1 and the single-bevel wedge block 2 of the kissing part 2 face upward, and the direction in which the height of the bevel increases is the same as the tightening direction of the external thread of the small disc. When bonding, the kissing part The inclined surfaces of the single-slope wedge block three of the joint three and the single-slope wedge block four of the kissing joint four are downward, the single-slope wedge block one of the kissing joint one is complementary to the inclined surfaces of the single-slope wedge block three of the kissing joint three, the single-slope wedge block two of the kissing joint two is complementary to the inclined surfaces of the single-slope wedge block four of the kissing joint four, the through hole one of the kissing joint one and the through hole two of the kissing joint two are respectively connected to and communicated with the inlet one of the distribution pipe one and the inlet two of the distribution pipe two, the through hole three of the kissing joint three and the through hole four of the kissing joint four are respectively connected to and communicated with the third connecting column and the fourth connecting column.

[0015] Furthermore, one end of the 1-1 section of each of the first-category pipelines is connected to the first connecting column of a rod member, and the other end is connected to an outlet 1 of the distribution pipe 1; one end of the 2-1 section of each of the second-category pipelines is connected to the second connecting column of a rod member, and the other end is connected to an outlet 2 of the distribution pipe 2; one end of the 1-2 section of the first-category pipeline is connected to the third connecting column of the barrel nut, and the other end is connected to an end of the fifth connecting column extending into the side wall of the long tube; one end of the 2-2 section of the second-category pipeline is connected to the fourth connecting column of the barrel nut, and the other end is connected to an end of the sixth connecting column extending into the side wall of the long tube.

[0016] Furthermore, the conveying member at the lower end of the pipe pile is placed on the temporary support frame.

[0017] Furthermore, the lower end surface of the pipe pile is fixedly connected to a first annular steel plate matched with the upper end of the steel casing, and the top of the pile tip is fixedly connected to a second annular steel plate matched with the lower end of the steel casing.

[0018] Based on the above-mentioned construction method of the soft soil foundation pipe pile reinforcement device, the steps are as follows:

[0019] Step 1: Assembly:

[0020] 1-1Fix the lower end of the steel casing to the second annular steel plate at the top of the pile tip;

[0021] 1-2 Connect the pipe section 1-1 and the pipe section 2-1 to the rod and the connecting plate of the conveying member at the lower end of the pipe pile;

[0022] 1-3 Place the conveying part at the lower end of the pile on the temporary support frame;

[0023] 1-4 Place the tip of each rod in the semicircular hole of the steel casing one by one, and seal the semicircular hole with low-grade plain concrete, and let it stand until the concrete solidifies;

[0024] 1-5 The upper end of the steel casing is fixedly connected to the first annular steel plate on the lower end surface of the pipe pile;

[0025] Step 2: Press the pipe pile into the foundation soil layer to the designed depth;

[0026] Step 3: The force transmission device is extended from the upper hole of the pipe pile to the position of the conveying member at the lower end of the pipe pile, and the tightening member is turned to rotate the force transmission rod, so that the barrel nut is tightened on the small disc, and the force transmission device is statically pressed or hammered to make the rod extend from the semicircular hole of the steel casing until it is inserted into the soft soil around the pipe pile;

[0027] Step 4: Connect external devices:

[0028] 4-1 The end of the fifth connecting column extending outside the side wall of the long tube and the end of the sixth connecting column extending outside the side wall of the long tube are respectively connected to two output ports of the air compressor to be filled with high-pressure air;

[0029] 4-2 The sixth connecting column extends out of the side wall of the long tube and continues to be filled with high-pressure air, and the fifth connecting column extends out of the side wall of the long tube and is switched to the vacuum device to extract water and gas;

[0030] 4-3 Repeat 4-1 to 4-2 until the water output is less than 0.05m 3 / h, turn off the vacuum device:

[0031] 4-4 The sixth connecting column extends out of the side wall of the long tube, and one end thereof is switched to connect with a high-pressure grouting machine, and concrete slurry is injected. Grouting is completed only when the grouting is basically stopped at the specified maximum grouting pressure;

[0032] 4-5 Let it stand for 30 minutes, then turn the tightening piece to rotate the force transmission rod to loosen the barrel nut until it comes off the small disc;

[0033] 4-6 Continue to inject concrete slurry 0.3m 3 ;

[0034] 4-7 The fifth connecting column extends out of the side wall of the long tube, one end is disconnected from the evacuation device, and is switched to be connected to an output port of the air compressor; the sixth connecting column extends out of the side wall of the long tube, one end is disconnected from the high-pressure grouting machine, and is switched to be connected to another output port of the air compressor, and is filled with high-pressure air to clean the concrete and soil in the 1-2 section of the first type of pipeline and the 2-2 section of the second type of pipeline;

[0035] 4-8 Take out the force transmission device from the upper hole of the pipe pile for later use.

[0036] The present invention has the following beneficial effects:

[0037] 1. The use of conveying parts at the lower end of the pipe pile, in which the rods that convey concrete slurry also serve as the skeleton, increases the distance of concrete slurry conveyed around the pile, greatly increases the cross-sectional area of ​​the consolidated body, and significantly improves the pile's ability to withstand axial and horizontal loads; 2. The assembly and construction process is simple and easy to operate, and the force transmission device can be reused; 3. Shorten the pile length or reduce the number of pile sections to save costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic diagram of the consolidation body formed after the pipe pile is pressed into the soft soil and the grouting is completed. The cloud-like dotted line in the figure represents the consolidation body (the soft soil is not drawn);

[0039] Figure 2 This is a schematic diagram of the structure before the steel casing, pile tip and pipe pile are connected;

[0040] Figure 3 (a) is a main schematic diagram of the lower end conveying member of the pipe pile with the 1-1 section pipe and the 2-1 section pipe installed, (b) is a partial enlarged diagram of the circled portion A in (a), and (c) is a bottom view schematic diagram of (a);

[0041] Figure 4 The upper figure is a schematic diagram of the distribution pipe 1 and the distribution pipe 2, and the lower figure is a perspective view of the distribution pipe 1 and the distribution pipe 2 embedded in the connecting disk (large disk and small disk);

[0042] Figure 5 is a schematic diagram of the rod;

[0043] Figure 6 In the figure, (a) is a left view of the rod, (b) is an enlarged perspective view of the first channel and the second channel of the AA segment in (a), and (c) is a top view of (b);

[0044] Figure 7The middle left figure is a schematic diagram of the process of the anastomosis between the anastomosis part 1 on the small disc and the anastomosis part 3 on the barrel nut (the 1-2 section tube 62 connected to the third connecting column 517 is not drawn), the left arc arrow indicates the tightening direction of the barrel nut, the lower arrow indicates that the barrel nut moves downward when tightened, and the right figure is a schematic diagram of the positional relationship when the barrel nut is tightened to the tightest position and the anastomosis part 1 and the anastomosis part 3 are completely anastomosed;

[0045] Figure 8 This is a schematic diagram of placing the conveying member at the lower end of the pile on a temporary support frame. In order to show the positional relationship between the conveying member at the lower end of the pile and the temporary support frame, the steel casing is not drawn;

[0046] Fig. 9 In the figure, the upper figure is a front view of the force transmission device, the lower left figure is a partial enlarged view of the circled portion B in the upper figure, and the lower right figure is a view of the force transmission device from another angle (observing the upper top surface of the barrel nut and its kissing portion three and kissing portion four from bottom to top);

[0047] Fig.10 In the figure, the upper figure is a front view of the force transmission device, the lower left figure is a partial enlarged cross-sectional view of CC (the fifth connecting column and the sixth connecting column) in the upper figure, and the lower right figure is a front cross-sectional view of the circled portion D in the upper figure (the junction of the long tube and the reinforcement component);

[0048] Fig.11 This is the overall assembly diagram of the soft soil foundation pipe pile reinforcement device;

[0049] In the figure, 1 is a pipe pile, 11 is a first circular steel plate, 2 is a steel casing, 21 is a semicircular hole, 3 is a pile tip, 31 is a second circular steel plate, 4 is a conveying member at the lower end of the pipe pile, 41 is a rod, 411 is a connecting ring, 412 is a first connecting column, 413 is a second connecting column, 414 is a first channel, 415 is a second channel, 416 is a first type of orifice, 417 is a second type of orifice, 4201 is a large disc, 4202 is a small disc, 4203 is a circular hole, 4204 is a kissing part 1, 4205 is a single-bevel wedge block 1, 4206 is a through hole 1, 4207 is a distribution pipe 1, 4208 is an inlet 1, 4209 is an outlet 1, 4210 is a kissing part 2, 4213 is distribution pipe two, 4214 is inlet two, 4215 is outlet two, 4216 is groove, 4217 is shaft, 5 is force transmission device, 51 is barrel nut, 511 is kissing part three, 512 is single slope wedge block three, 513 is through hole three, 514 is kissing part four, 515 is single slope wedge block four, 516 is through hole four, 517 is third connecting column, 52 is force transmission rod, 521 is reinforcement component, 522 is large through hole, 523 is long tube, 524 is fifth connecting column, 525 is sixth connecting column, 53 is tightening piece, 62 is 1-2 section pipe, 72 is 2-2 section pipe, 8 is temporary support frame. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0051] For this example, see Figure 1 , Fig.11 A soft soil foundation pipe pile reinforcement device includes a pipe pile 1 with a cavity structure, a pile tip 3 with a conical structure, a steel casing 2, a conveying member 4 at the lower end of the pipe pile, a force transmission device 5, a first type of pipeline 6, a second type of pipeline 7, and a temporary support frame 8.

[0052] See also Figure 2 The steel casing 2 has a lower end fixedly connected to the pile tip 3 and an upper end fixedly connected to the lower end surface of the pipe pile 1, and a plurality of semicircular holes 21 are evenly distributed along the circumferential direction on the side surface.

[0053] See also Figure 3-Figure 6 The conveying member 4 at the lower end of the pile comprises a rod 41 and a connecting plate; the rod 41 has a plurality of rods, the number of which is equal to the number of the semicircular holes 21 of the steel casing 2, the head end is a pointed end, the tail end has a connecting ring 411, near the tail end there are a first connecting column 412 and a second connecting column 413 of a hollow structure, the rod 41 has a first channel 414 and a second channel 415 which are not connected to each other, the surface of the rod 41 has a plurality of first-type orifices 416 and a plurality of second-type orifices 417, the plurality of first-type orifices 416 and a plurality of second-type orifices 417 are arranged side by side along the axial interval on the surface of the rod 41, the first-type orifices 416 are orifices for conveying water and gas, preferably, in order to prevent them from being blocked by mud and sand, a filter device which is permeable to air and water is provided in the first-type orifice 416; the first connecting column 41 2 and each first-type orifice 416 are mutually connected through the first channel 414, and the second connecting column 413 and each second-type orifice 417 are mutually connected through the second channel 415. The first channel 414 and the second channel 415 are composed of a vertical channel in the vertical direction (axial direction) and a plurality of spaced-apart horizontal direction (radial) arc channels. The vertical channel of the first channel 414 is upwardly connected with the first connecting column 412, and the arc channel of the first channel 414 is respectively connected with the corresponding two first-type orifices 416 in the forward and backward directions. The vertical channel of the second channel 415 is upwardly connected with the second connecting column 413, and the arc channel of the second channel 415 is respectively connected with the corresponding two second-type orifices 417 in the left and right directions. The vertical channel and the arc channel of the same channel are connected.

[0054] See also Figure 3 , Figure 4 and Figure 8The connecting disk is a coaxially arranged large disk 4201 with multiple grooves 4216 on the edge and a small disk 4202 with external threads, and a distribution pipe 1 4207 and a distribution pipe 2 4213 are embedded inside. The large disk 4201 and the small disk 4202 and the distribution pipe 1 4207 and the distribution pipe 2 4213 are an integrated structure. A through hole 4203 is set in the center of the large disk 4201 and the small disk 4202. The distribution pipe 1 4207 includes an inlet 1 4208 and multiple outlets 1 4209. The distribution pipe 2 4213 includes an inlet 2 4214 and multiple outlets 2 4215. The outlet 1 4209 and the outlet 2 4213 are connected to each other. The number of the plurality of distribution tubes 4217 is equal to the number of the plurality of rods 41, and each outlet extends out of the hole wall of the circular hole 4203. The inlet 1 4208 of the distribution tube 1 4207 and the inlet 2 4214 of the distribution tube 2 4213 are symmetrically arranged on the upper top surface of the small disc 4202. A kissing portion 1 4204 and a kissing portion 2 4210 made of a flexible material (such as rubber material) are respectively adhered to the corresponding positions of the inlet 1 4208 of the distribution tube 1 4207 and the inlet 2 4214 of the distribution tube 2 4213 on the upper top surface of the small disc 4202; each of the grooves 4216 is fixedly connected to a shaft 4217, and each shaft 4217 is rotatably connected to the connecting ring 411 of the rod 41 with clearance fit.

[0055] See also Figure 3 , Figure 7-Figure 11 The force transmission device 5 includes a barrel nut 51, a force transmission rod 52, and a tightening piece 53; the barrel nut 51 opens downward, and an inner wall is provided with an internal thread matching the external thread of the small disc 4202. Preferably, the external thread of the small disc 4202 and the internal thread on the inner wall of the barrel nut 51 are coarse threads; a kissing portion three 511 and a kissing portion four 514 are provided on the inner top surface, and a third connecting column 517 and a fourth connecting column of the hollow structure are fixedly connected at positions on the outer top surface corresponding to the kissing portion three 511 and the kissing portion four 514 on the inner top surface.

[0056] The force transmission rod 52 is composed of a reinforcing component 521 with an isosceles trapezoidal longitudinal section and a long tube 523 with a hollow channel inside. The reinforcing component 521 is fixedly connected to the outer top surface of the barrel nut 51. The reinforcing component 521 has a cavity inside and a rectangular bottom cross-section. The center line of the long direction of the rectangle coincides with the center line of the kissing part three 511 and the kissing part four 514. The third connecting column 517 and the fourth connecting column are covered in the cavity of the reinforcing component 521. A large through hole 522 is provided at the top center of the component 521, and the long tube 523 is fixedly connected to the top of the reinforcing component 521. The cavity of the reinforcing component 521 is interconnected with the hollow channel of the long tube 523 through the large through hole 522. Preferably, the side surfaces in the long direction of the reinforcing component 521 and the side walls of the long tube 523 are hollowed out, the purpose of which is to reduce the weight of the force transmission rod 52 and to facilitate the installation and maintenance of the first type of pipeline and the second type of pipeline arranged in the cavity of the force transmission rod 52.

[0057] The tightening member 53 has a regular hexagonal cross-sectional shape and is fixedly connected to the upper top portion of the long tube 523 of the force transmission rod 52. A fifth connecting column 524 and a sixth connecting column 525 of a hollow structure are arranged side by side on the side wall of the long tube 523 near the lower position of the tightening member 53. The fifth connecting column 524 and the sixth connecting column 525 both have one end extending into the side wall of the long tube 523 and the other end extending out of the side wall of the long tube 523. The other end extending out of the side wall of the long tube 523 is connected to an external device; the external device includes an air compressor, an evacuation device, and a high-pressure grouting machine; the evacuation device can be a vacuum pump, a liquid ring pump, a jet pump or other devices.

[0058] See also Figure 3 , Figure 5 , Figure 7-11 The first type of pipeline includes the 1-1 section pipe and the 1-2 section pipe 62, and the second type of pipeline includes the 2-1 section pipe and the 2-2 section pipe 72. There are multiple 1-1 section pipes and 2-1 section pipes, and the number of pipes is equal to the number of the rods.

[0059] The temporary support frame 8 is made of fragile materials, such as gypsum, foam plastics, low-grade concrete, and clay.

[0060] Furthermore, the diameter of the rod 41 is smaller than the radius of the semicircular hole 21 of the steel casing 2 , so that the rod 41 can be easily extended from the semicircular hole 21 .

[0061] See also Figure 3 , Figure 4 and Figure 7-11Further, the kissing part 1 4204, the kissing part 2 4210, the kissing part 3 511, and the kissing part 4 514 have the same structure, equal size, and consistent shape, are all single-bevel wedge blocks, and a through hole is set at the center position. The kissing part 1 4204 includes a single-bevel wedge block 1 4205 and a through hole 1 4206, the kissing part 2 4210 includes a single-bevel wedge block 2 and a through hole 2, the kissing part 3 511 includes a single-bevel wedge block 3 512 and a through hole 3 513, and the kissing part 4 514 includes a single-bevel wedge block 4 515 and a through hole 4 516. When bonding, the single-bevel wedge block 1 4205 of the kissing part 1 4204 and the single-bevel wedge block 2 of the kissing part 2 4210 are inclined upward, and the inclined height increases in the direction. The tightening direction is the same as that of the external thread of the small disc 4202. During bonding, the inclined surfaces of the single-bevel wedge block three 512 of the kissing part three 511 and the single-bevel wedge block four 515 of the kissing part four 514 are downward, the single-bevel wedge block one 4205 of the kissing part one 4204 is complementary to the inclined surface of the single-bevel wedge block three 512 of the kissing part three 511, and the single-bevel wedge block two of the kissing part two 4210 is complementary to the inclined surface of the single-bevel wedge block four 515 of the kissing part four 514. When the force transmission device 5 is rotated, when the internal thread on the barrel nut 51 and the external thread on the small disc 4202 reach the tightest position, the kissing part one 4204 is completely consistent with the kissing part three 511, and the through hole one 4206 is sealed and connected with the through hole three 513 (please refer to Figure 7 ), the kissing part two 4210 is completely matched with the kissing part four 514, and the through hole two is sealed and connected with the through hole four 516; the through hole one 4206 of the kissing part one 4204 and the through hole two of the kissing part two 4210 are respectively connected to the inlet one 4208 of the distribution tube one 4207 and the inlet two 4214 of the distribution tube two 4213 and are connected, and the through hole three 513 of the kissing part three 511 and the through hole four 516 of the kissing part four 514 are respectively connected to the third connecting column 517 and the fourth connecting column and are connected.

[0062] See also Figure 3 , Figure 5 , Figure 7-11Furthermore, one end of the 1-1 section of each of the first-type pipelines is connected to the first connecting column 412 of the rod 41, and the other end is connected to an outlet 4209 of the distribution pipe 4207; one end of the 2-1 section of each of the second-type pipelines is connected to the second connecting column 413 of the rod 41, and the other end is connected to an outlet 2 4215 of the distribution pipe 2 4213; one end of the 1-2 section of the pipe 62 of the first-type pipeline is connected to the third connecting column 517 of the barrel nut 51, and the other end is connected to an end of the fifth connecting column 524 extending into the side wall of the long tube 523; one end of the 2-2 section of the pipe 72 of the second-type pipeline is connected to the fourth connecting column of the barrel nut 51, and the other end is connected to an end of the sixth connecting column 525 extending into the side wall of the long tube.

[0063] See also Figure 8 , Fig.11 Furthermore, the conveying member 4 at the lower end of the pipe pile is placed on the temporary support frame 8.

[0064] See also Figure 2 Furthermore, the lower end surface of the pipe pile 1 is fixedly connected to a first annular steel plate 11 that matches the upper end of the steel casing 2, and the top of the pile tip 3 is fixedly connected to a second annular steel plate 31 that matches the lower end of the steel casing 2.

[0065] During construction, the present invention is used. After assembly is completed, air, water and concrete slurry are transported as follows: high-pressure air first enters from the fifth connecting column 524 and the sixth connecting column 525 at the same time, and the fifth connecting column 524 is sprayed into the soft soil through the 1-2 section pipe 62 of the first type of pipeline, the third connecting column 517, the kissing part 3 511, the kissing part 1 4204, the inlet 1 4208, the distribution pipe 1 4207, each outlet 1 4209, the 1-1 section pipe of the first type of pipeline, the first connecting column 412, the first channel 414, and the first type of orifice 416; the sixth connecting column 525 is sprayed into the soft soil through the 1-2 section pipe 62 of the first type of pipeline, the third connecting column 517, the kissing part 3 511, the kissing part 1 4204, the inlet 1 4208, the distribution pipe 1 4207, each outlet 1 4209, the 1-1 section pipe of the first type of pipeline, the first connecting column 412, the first channel 414, and the first type of orifice 416; The 2-2 section pipe 72 of the second type of pipeline, the fourth connecting column, the kissing part four 514, the kissing part two 4210, the inlet two 4214, the distribution pipe two 4213, each outlet two 4215, the 2-1 section pipe of the second type of pipeline, the second connecting column 413, the second channel 415, and the second type of orifice 417 are sprayed into the soft soil. The purpose of inputting high-pressure air is to, first, increase the pore water pressure, which is beneficial to the next step of pumping water, and is beneficial to increasing the degree of soil consolidation and shortening the consolidation time; second, flush the orifice and the sediment in the channel; and third, increase the gap around the rod, which is beneficial to the next step of injecting concrete slurry.

[0066] Water: enters the first channel 414 from the first type of orifice 416, the first connecting column 412, the 1-1 section of the first type of pipeline, each outlet 4209, each outlet 4209, the distribution pipe 4207, the inlet 4208, the kissing part 4204, the kissing part three 511, the third connecting column 517, the 1-2 section of the first type of pipeline 62, and is extracted through the fifth connecting column 524.

[0067] Concrete slurry: is injected into the soft soil from the sixth connecting column 525 through the 2-2 section pipe 72 of the second type of pipeline, the fourth connecting column, the fourth kissing part 514, the second kissing part 4210, the second inlet 4214, the second distribution pipe 4213, each second outlet 4215, the 2-1 section pipe of the second type of pipeline, the second connecting column 413, the second channel 415, and the second type of orifice 417.

[0068] Based on the above-mentioned construction method of the soft soil foundation pipe pile reinforcement device, the steps are as follows:

[0069] Step 1: Assembly:

[0070] 1-1 The lower end of the steel casing 2 is fixedly connected to the second annular steel plate 31 at the top of the pile tip 3;

[0071] 1-2 Connect the pipe section 1-1 and the pipe section 2-1 to the rod 41 and the connecting plate of the conveying member 4 at the lower end of the pile;

[0072] 1-3 Place the conveying member 4 at the lower end of the pile on the temporary support frame 8;

[0073] 1-4 Place the tip of each rod 41 in the semicircular hole 21 of the steel casing 2 one by one, and seal the semicircular hole 21 with low-grade plain concrete, and let it stand until the concrete solidifies;

[0074] 1-5 The upper end of the steel casing 2 is fixedly connected to the first annular steel plate 11 on the lower end surface of the pipe pile 1;

[0075] Step 2: Press the pipe pile 1 into the foundation soil layer to the designed depth;

[0076] Step 3: The force transmission device 5 is extended from the upper hole of the pipe pile 1 to the position of the conveying member 4 at the lower end of the pipe pile, and the tightening member 53 is screwed to tighten the barrel nut 51 on the small disc 4202. The force transmission device 5 is statically pressed or hammered to make the rod 41 extend from the semicircular hole 21 of the steel casing 2 until it is inserted into the soft soil around the pipe pile 1.

[0077] Step 4: Connect external devices:

[0078] 4-1 The fifth connecting column 524 extends out of the side wall of the long tube 523 at one end, and the sixth connecting column 525 extends out of the side wall of the long tube 523 at one end, respectively connected to two output ports of the air compressor to be filled with high-pressure air;

[0079] 4-2 The sixth connecting column 525 extends out of the side wall of the long tube 523 and continues to be filled with high-pressure air. The fifth connecting column 524 extends out of the side wall of the long tube 523 and is switched to the vacuum device to extract water and gas.

[0080] 4-3 Repeat 4-1 to 4-2 until the water output is less than 0.05m3 / h, and then turn off the vacuum device:

[0081] 4-4 The sixth connecting column 525 extends out of the side wall of the long tube 523 and is switched to be connected to a high-pressure grouting machine to inject concrete slurry. Grouting is completed only when the grouting is basically stopped at the specified maximum grouting pressure.

[0082] 4-5 After standing for 30 minutes, tighten the tightening member 53 to loosen the barrel nut 51 until it is detached from the small disc 4202;

[0083] 4-6 Continue to inject 0.3m3 of concrete slurry;

[0084] 4-7 The fifth connecting column 524 extends out of the side wall of the long tube 523, is disconnected from the vacuum device, and is switched to be connected to an output port of the air compressor; the sixth connecting column 525 extends out of the side wall of the long tube 523, is disconnected from the high-pressure grouting machine, and is switched to be connected to another output port of the air compressor, and is filled with high-pressure air to clean the concrete and soil in the 1-2 section pipe 62 of the first type of pipeline and the 2-2 section pipe 72 of the second type of pipeline;

[0085] 4-8 Take out the force transmission device 5 from the upper hole of the pipe pile 1 for later use.

Claims

1. A soft soil foundation pipe pile reinforcement device, comprising a pipe pile with a cavity structure and a pile tip with a conical structure, characterized in that: It also includes steel casing, conveying parts at the lower end of the pile, force transmission device, first-class pipeline, second-class pipeline and temporary support frame; The steel casing has a lower end fixedly connected to the pile tip, an upper end fixedly connected to the lower end face of the pipe pile, and a side surface is evenly distributed with a plurality of semicircular holes along the circumferential direction; the conveying member at the lower end of the pipe pile comprises a rod and a connecting plate; the rod has a plurality of rods, the number of which is equal to the number of the semicircular holes of the steel casing, each rod corresponds one to one with a semicircular hole of the steel casing, the head end is a pointed end, the tail end has a connecting ring, near the tail end there are a first connecting column and a second connecting column of a hollow structure, the rod has a first channel and a second channel which are not connected to each other, the surface of the rod has a plurality of first-type openings and a plurality of second-type openings, the first connecting column and each first-type opening are interconnected through the first channel, the second connecting column and each second-type opening are interconnected through the second channel; the connecting plate is a large circular plate with a plurality of grooves on the edge which is coaxially arranged The large disk and the small disk with external threads have distribution tubes 1 and 2 embedded therein. The large disk and the small disk and the distribution tubes 1 and 2 are an integrated structure. The large disk and the small disk are centrally provided with through circular holes. The distribution tube 1 includes an inlet 1 and multiple outlets 1. The distribution tube 2 includes an inlet 2 and multiple outlets 2. The number of outlets 1 and 2 is equal to the number of the rods. The inlet 1 of the distribution tube 1 and the inlet 2 of the distribution tube 2 are symmetrically arranged on the upper top surface of the small disk. The corresponding positions of the inlet 1 of the distribution tube 1 and the inlet 2 of the distribution tube 2 on the upper top surface of the small disk are respectively bonded with a kissing part 1 and a kissing part 2 made of flexible material. Each of the grooves is fixedly connected to a shaft, and each shaft is rotatably connected with the connection ring of one of the rods by gap matching. The force transmission device includes a barrel-shaped nut, a force transmission rod, and a tightening piece. The barrel-shaped nut opens downward, and an inner side wall is provided with an internal thread matching the external thread of the small disc. A kissing portion three and a kissing portion four are provided on the inner top surface. A third connecting column and a fourth connecting column of a hollow structure are fixedly connected at positions on the outer top surface corresponding to the kissing portions three and four on the inner top surface. The force transmission rod is composed of a reinforcing component with an isosceles trapezoidal longitudinal section and a long tube with a hollow channel therein. The reinforcing component is fixedly connected to the outer top surface of the barrel-shaped nut, and a cavity is provided in the reinforcing component. The bottom cross-section is a rectangle, and the center line of the long direction of the rectangle coincides with the center line connecting the kissing portion three and the kissing portion four. The third connecting column and the fourth connecting column are connected to the outer top surface of the barrel-shaped nut. The column is covered in the cavity of the reinforcing component, a large through hole is set at the top center of the reinforcing component, the long tube is fixedly connected to the top of the reinforcing component, and the cavity of the reinforcing component is interconnected with the hollow channel of the long tube through the large through hole; the tightening piece has a regular hexagonal cross-sectional shape, and is fixedly connected to the upper top end of the long tube of the force transmission rod, and a fifth connecting column and a sixth connecting column of a hollow structure are arranged side by side on the side wall of the long tube near the lower position of the tightening piece, and the fifth connecting column and the sixth connecting column both have one end extending into the side wall of the long tube and the other end extending out of the side wall of the long tube, and the other end extending out of the side wall of the long tube is connected to an external device; the external device includes an air compressor, a vacuum device, and a high-pressure grouting machine; The first type of pipeline includes a 1-1 section pipe and a 1-2 section pipe, and the second type of pipeline includes a 2-1 section pipe and a 2-2 section pipe. There are multiple 1-1 section pipes and 2-1 section pipes, and the number of the 1-1 section pipes is equal to the number of the rods. One end of each 1-1 section pipe of the first type of pipeline is connected to the first connecting column of a rod, and the other end is connected to one of the outlets 1 of the distribution pipe 1. One end of each 2-1 section pipe of the second type of pipeline is connected to the second connecting column of a rod, and the other end is connected to one of the outlets 2 of the distribution pipe 2. One end of the 1-2 section pipe of the first type of pipeline is connected to the third connecting column of the barrel nut, and the other end is connected to one end of the fifth connecting column extending into the side wall of the long tube. One end of the 2-2 section pipe of the second type of pipeline is connected to the fourth connecting column of the barrel nut, and the other end is connected to one end of the sixth connecting column extending into the side wall of the long tube. The temporary support frame is made of fragile materials, and the conveying member at the lower end of the pipe pile is placed on the temporary support frame.

2. The soft soil foundation pipe pile reinforcement device according to claim 1, characterized in that: The rod diameter is smaller than the radius of the semicircular hole of the steel casing.

3. The soft soil foundation pipe pile reinforcement device according to claim 1, characterized in that: The kissing part 1, kissing part 2, kissing part 3 and kissing part 4 have the same structure, equal size and consistent shape, are all single-bevel wedge blocks and a through hole is set at the center position, kissing part 1 includes single-bevel wedge block 1 and through hole 1, kissing part 2 includes single-bevel wedge block 2 and through hole 2, kissing part 3 includes single-bevel wedge block 3 and through hole 3, kissing part 4 includes single-bevel wedge block 4 and through hole 4. When bonding, the single-bevel wedge block 1 of kissing part 1 and the single-bevel wedge block 2 of kissing part 2 face upwards, and the direction of increasing the height of the bevel is the same as the tightening direction of the external thread of the small disc. When bonding, the kissing part The single-slope wedge block three of the three and the single-slope wedge block four of the kissing part four have their slopes downward, the single-slope wedge block one of the kissing part one is complementary to the single-slope wedge block three of the kissing part three, the single-slope wedge block two of the kissing part two is complementary to the single-slope wedge block four of the kissing part four, the through hole one of the kissing part one and the through hole two of the kissing part two are respectively connected to and penetrated with the inlet one of the distribution pipe one and the inlet two of the distribution pipe two, the through hole three of the kissing part three and the through hole four of the kissing part four are respectively connected to and penetrated with the third connecting column and the fourth connecting column.

4. The soft soil foundation pipe pile reinforcement device according to claim 1, characterized in that: The lower end surface of the pipe pile is fixedly connected to a first annular steel plate matched with the upper end of the steel casing, and the top of the pile tip is fixedly connected to a second annular steel plate matched with the lower end of the steel casing.

5. The construction method of the soft soil foundation pipe pile reinforcement device according to any one of claims 1 to 4, characterized in that: Here are the steps: Step 1: Assembly: 1-1 The lower end of the steel casing is fixedly connected to the second annular steel plate at the top of the pile tip; 1-2 Connect the pipe section 1-1 and the pipe section 2-1 to the rod and the connecting plate of the conveying member at the lower end of the pile; 1-3 Place the conveying part at the lower end of the pile on the temporary support frame; 1-4 Place the tip of each rod in the semicircular hole of the steel casing one by one, and seal the semicircular hole with low-grade plain concrete, and let it stand until the concrete solidifies; 1-5 Fixing the upper end of the steel casing to the first annular steel plate on the lower end surface of the pile; Step 2: Press the pipe pile into the foundation soil layer to the designed depth; Step 3: The force transmission device is extended from the upper hole of the pipe pile to the position of the conveying member at the lower end of the pipe pile, and the tightening member is screwed to tighten the barrel nut on the small disc, and the force transmission device is statically pressed or hammered to make the rod extend from the semicircular hole of the steel casing until it is inserted into the soft soil around the pipe pile; Step 4: Connect external devices: 4-1 The end of the fifth connecting column extending outside the side wall of the long tube and the end of the sixth connecting column extending outside the side wall of the long tube are respectively connected to two output ports of the air compressor to be filled with high-pressure air; 4-2 The sixth connecting column extends out of the side wall of the long tube and continues to be filled with high-pressure air, and the fifth connecting column extends out of the side wall of the long tube and is switched to the vacuum device to extract water and gas; 4-3 Repeat 4-1 to 4-2 until the water output is less than 0.05m 3 / h, turn off the vacuum device: 4-4 The sixth connecting column extends out of the side wall of the long tube and is switched to be connected to a high-pressure grouting machine to inject concrete slurry. Grouting is completed only when the grouting is basically stopped at the specified maximum grouting pressure. 4-5 Let it stand for 30 minutes, then twist the tightening piece to loosen the barrel nut until it comes off the small disc; 4-6 Continue to inject concrete slurry 0.3m 3 ; 4-7 The fifth connecting column extends out of the side wall of the long tube, one end is disconnected from the evacuation device, and is switched to be connected to an output port of the air compressor; the sixth connecting column extends out of the side wall of the long tube, one end is disconnected from the high-pressure grouting machine, and is switched to be connected to another output port of the air compressor, and is filled with high-pressure air to clean the concrete and soil in the 1-2 section of the first type of pipeline and the 2-2 section of the second type of pipeline; 4-8 Take out the force transmission device from the upper hole of the pipe pile for later use.

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