Mountainous high fill area stratum soil body reinforcing method

Abstract

The application discloses a mountain high-fill area stratum soil body reinforcing method, and relates to the technical field of soil body reinforcing, which comprises the following steps: S1, construction preparation, measuring and marking a plurality of high-pressure rotary jetting pile positions and a plurality of flower pipe pile positions on the side of a to-be-constructed bored pile position; S2, high-pressure rotary jetting pile construction; S3, steel flower pipe lowering; S4, first round grouting; a grouting gun head for grouting a grouting hole in the steel flower pipe is arranged in the steel flower pipe and is used for grouting; a directional grouting device for directing the cement slurry in the grouting gun head to the high-pressure rotary jetting pile is detachably arranged on the grouting gun head, and grouting is performed through the directional grouting device; S5, second round grouting, the directional grouting device is detached from the grouting gun head, and the grouting gun head is driven to ascend and descend in the steel flower pipe for grouting; and S6, supplementary grouting. The application has the effect of improving the problem that, when the drilling construction is performed to a position below a steel casing, leakage and hole collapse occur in the hole forming process, and the hole forming efficiency is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of soil reinforcement, and in particular to a method for reinforcing soil in mountainous high-fill areas. Background Art

[0002] When bored cast-in-place pile construction is carried out in mountainous areas, due to the rugged terrain and narrow construction site, in order to meet the needs of large equipment such as rotary drilling rigs, a large amount of earth backfill and leveling will be carried out in the construction site. Pile foundation construction will only begin after the site basically meets the requirements.

[0003] Currently, during bored pile construction, a steel casing is buried at a depth of about three meters at the preset drilling location to reinforce the surrounding soil near the hole mouth.

[0004] However, due to the poor uniformity of the backfill soil density and the presence of debris such as gravel, bricks and garbage in the soil, when the drilling construction reaches a position below the steel casing, leakage and hole collapse will occur during the drilling process. At this time, the pile position needs to be changed, resulting in a decrease in drilling efficiency. Summary of the Invention

[0005] In order to improve the problem of reduced drilling efficiency caused by leakage and hole collapse during the drilling process when drilling to a position below the steel casing, the present application provides a method for reinforcing soil in mountainous high-fill areas.

[0006] The present application provides a method for reinforcing soil in mountainous high-fill areas using the following technical solutions:

[0007] A method for reinforcing soil in a high-fill area in a mountainous area comprises the following steps:

[0008] S1. Construction preparation, leveling the construction area, in the construction of bored piles to be constructed around the side of the pile position to measure multiple high-pressure jet grouting piles and multiple flower pipe pile positions and mark them, the high-pressure jet grouting pile positions and the flower pipe pile positions alternately spaced;

[0009] S2 high-pressure rotary jet pile construction, the high-pressure rotary jet pile construction to form a high-pressure rotary jet pile, the lower end of the high-pressure rotary jet pile extends to the backfill soil below the soil layer;

[0010] S3. The steel flower pipe is lowered and a hole is drilled at the flower pipe pile position to form a flower pipe pile hole. The inner bottom wall of the flower pipe pile hole extends to the soil layer below the backfill soil. The customized steel flower pipe is then lowered into the flower pipe pile hole.

[0011] S4. First round of grouting; the steel flower pipe is provided with a grouting gun head for grouting the steel flower pipe in the upper grouting hole, both ends of the grouting gun head are provided with a grout stop ring, a directional grouting device for directing the cement slurry in the grouting gun head to the high-pressure jet grouting pile is detachably arranged on the grouting gun head, the grouting gun head is driven to ascend and descend in the steel flower pipe, and grouting is performed through the directional grouting device;

[0012] S5. Second round of grouting, the directional grouting device is detached from the grouting gun head, the grouting gun head is driven to ascend and descend in the steel flower pipe, and the cement slurry injected by the grouting gun head is diffused into the soil layer through the grouting hole on the steel flower pipe;

[0013] S6. Grouting, cement slurry is injected into the steel flower pipe, and the grouting is stopped when the cement slurry appears at the hole of the flower pipe pile.

[0014] By adopting the above technical scheme, when it is necessary to perform the bored pile construction on the backfill soil body, the backfill soil body needs to be first reinforced, a plurality of high-pressure jet grouting pile positions and a plurality of flower pipe pile positions are marked on the side of the to-be-constructed bored pile position, the high-pressure jet grouting pile construction is performed at the high-pressure jet grouting pile position, and the flower pipe pile construction is performed between adjacent two high-pressure jet grouting piles. In the flower pipe pile construction process, the first round of grouting is performed from the flower pipe pile hole to the high-pressure jet grouting pile through the grouting gun head and the directional grouting device, a connection network is formed between the high-pressure jet grouting pile and the flower pipe pile, and the connection effect of the high-pressure jet grouting pile and the flower pipe pile is improved. While the backfill soil layer is reinforced, the plurality of high-pressure jet grouting piles and the plurality of flower pipe piles are connected with each other to surround and protect the to-be-constructed bored pile position. In addition, the second round of grouting forms a cement network for reinforcing the backfill soil layer at the flower pipe pile, so as to reinforce the backfill soil layer. Under the comprehensive action of the two aspects, the problem that the leakage and hole collapse occur in the hole forming process when the drilling construction is performed to the position below the steel casing, and the hole forming efficiency is reduced is improved.

[0015] Optionally, the steel flower pipe comprises a pointed head part, a grouting part and a grout stop part connected in sequence, a plurality of grouting holes are formed in the grouting part, the plurality of grouting holes are distributed at intervals along the circumference of the grouting part, a plurality of groups of directional holes are formed in the grouting part along the length direction of the grouting part, each group of directional holes comprises the directional holes arranged towards the high-pressure jet grouting piles on both sides of the grouting part, respectively, the pointed head part is located at the bottom wall of the flower pipe pile hole, and a grout outlet hole is formed in the side wall of the pointed head part.

[0016] By adopting the technical scheme, when a connection network needs to be formed between the high-pressure jet grouting pile and the flower pipe pile, the pointed head of the steel flower pipe is inserted into the bottom of the flower pipe pile hole, the grouting gun head is located at the directional hole with the directional grouting device, and the first round of grouting is performed through the directional hole towards the high-pressure jet grouting pile, then the second round of grouting is performed through the grouting hole on the grouting part, and finally the grouting is supplemented into the steel flower pipe and the flower pipe pile hole through the grouting stopping part, so that the connection network is formed between the high-pressure jet grouting pile and the flower pipe pile to reinforce the backfill soil layer, and at the same time, the cement network for reinforcing the backfill soil layer is formed at the flower pipe pile, thereby improving the problem that the hole forming efficiency is reduced due to the leakage and hole collapse during the hole forming process when the drilling construction is performed to the position below the steel casing.

[0017] Optionally, the directional grouting device comprises a directional sleeve detachably sleeved on the grouting gun head, two directional pipes slidingly penetrating the peripheral wall of the directional sleeve, an electric valve for opening and closing the directional pipes, and a driving member for driving the directional pipes to move towards or away from the grouting gun head, the inner wall of the directional sleeve and the peripheral wall of the grouting gun head jointly form a communication cavity in communication with the grouting gun head, and the two ends of the two directional pipes away from the grouting gun head respectively penetrate two directional holes of the same group of directional holes.

[0018] By adopting the technical scheme, when the first round of grouting needs to be performed, the directional sleeve is installed on the grouting gun head, the grouting gun head is driven to ascend or descend to align the directional pipes with the directional holes, then the driving member drives the directional pipes to move away from the grouting gun head to the end thereof penetrating the directional holes and extending into the soil layer, the electric valve is started to drive the directional pipes to open, and the grouting gun head delivers the cement slurry to the directional pipe orifice through the communication cavity to perform grouting towards the high-pressure jet grouting pile, thereby forming a connection network between the high-pressure jet grouting pile and the flower pipe pile, improving the connection effect of the high-pressure jet grouting pile and the flower pipe pile, reinforcing the backfill soil layer, and surrounding the to-be-constructed bored pile position with the multiple high-pressure jet grouting piles and the multiple flower pipe piles, thereby improving the problem that the hole forming efficiency is reduced due to the leakage and hole collapse during the hole forming process when the drilling construction is performed to the position below the steel casing.

[0019] Optionally, the driving member comprises a flexible sealing sheet fixedly sleeved on the peripheral wall of the end of the directional pipe located in the electric valve, the peripheral wall of the flexible sealing sheet is fixedly connected with the inner wall of the directional sleeve, and the flexible sealing sheet and the inner wall of the directional sleeve jointly form an exhaust cavity, and the exhaust cavity is in communication with the steel flower pipe.

[0020] By adopting the technical scheme, the air in the exhaust cavity is pushed out by the flexible sealing sheet driven by the cement slurry, so that the directional pipe is pushed to move into the soil layer in a direction away from the head of the grouting gun, the exhaust cavity is reset by extracting the cement slurry, and then the directional pipe is retracted into the steel flower pipe, so that the next cycle of directional grouting is facilitated, the installation efficiency of the overall device and the efficiency of grouting towards the high-pressure rotary jet pile are improved, and the construction period is shortened.

[0021] Optionally, the directional sleeve is provided with an elastic member for driving the directional pipe to move in a direction close to the head of the grouting gun.

[0022] By adopting the technical scheme, when the directional pipe needs to be retracted into the steel flower pipe, the elastic member assists in driving the directional pipe to move in a direction close to the head of the grouting gun when the cement slurry is extracted, the efficiency of resetting the directional pipe is improved, and the grouting efficiency is improved.

[0023] Optionally, an end of the directional pipe away from the head of the grouting gun is sleeved with a flexible baffle for blocking the backflow of the cement slurry, and when the end of the directional pipe away from the head of the grouting gun is located outside the steel flower pipe, the flexible baffle shields the directional hole corresponding to the directional pipe.

[0024] By adopting the technical scheme, when the directional pipe moves to abut against the flexible baffle and the inner wall of the steel flower pipe, the backflow of the cement slurry into the steel flower pipe through the directional hole is avoided as much as possible, so that the cement slurry is prevented from solidifying and plugging the grouting hole of the steel flower pipe, and the efficiency and effect of the second round of grouting are improved.

[0025] Optionally, before the step S4 of pouring the cement slurry towards the high-pressure rotary jet pile, the electric valve is started to close the directional pipe, the cement slurry is injected into the communication cavity through the head of the grouting gun, and when the end of the directional pipe away from the head of the grouting gun passes through the directional hole, the electric valve is started to open the directional pipe.

[0026] After the step S4 of pouring the cement slurry towards the high-pressure rotary jet pile, the electric valve is started to close the directional pipe, the cement slurry is extracted from the communication cavity through the head of the grouting gun, and when the end of the directional pipe away from the head of the grouting gun is located in the steel flower pipe, the grouting gun is driven to ascend to the next set of directional holes, and the above steps are repeated.

[0027] By adopting the technical scheme, the process of driving the directional pipe to move close to or away from the head of the grouting gun is conveniently completed by starting the electric valve to open and close the directional pipe and by injecting and extracting the cement slurry through the head of the grouting gun, the installation efficiency of the overall device and the efficiency of grouting towards the high-pressure rotary jet pile are improved, and the construction period is shortened.

[0028] Optionally, the opening at the end of the directional pipe away from the grouting gun head is arranged as a constricted opening.

[0029] By adopting the above technical scheme, when the cement slurry moves to the opening at the constricted end of the directional pipe, the flow rate of the cement slurry is accelerated, the efficiency of the cement slurry flowing towards the high-pressure jet grouting pile is improved, and the directional effect of the directional pipe on the cement slurry is improved.

[0030] Optionally, the directional sleeve comprises two embracing parts, flaps fixed on both sides of the embracing parts, four blocking parts, and fixing bolts for connecting the flaps with the flaps of another directional sleeve, the two ends of the embracing parts are integrally formed with two blocking parts respectively, the communication cavity is surrounded by the outer peripheral wall of the grouting gun head, the inner peripheral walls of the two embracing parts, and the four blocking parts, and the fixing bolts are arranged in multiple, and the multiple fixing bolts are arranged along the length direction of the flaps.

[0031] By adopting the above technical scheme, when the first round of grouting is needed, the two embracing parts are respectively brought close to each other from both sides of the grouting gun head to form a cylindrical shape, at this time, the blocking parts block the two ends of the embracing parts to form a communication cavity, and finally the flaps on the two embracing parts are connected with each other through the fixing bolts, so that the directional sleeve can be detachably fixed on the grouting gun head, when the second round of grouting is needed, the directional sleeve can be removed, thereby improving the convenience of construction.

[0032] Optionally, a sealing strip is arranged on the blocking part at the abutting position of the blocking part and the grouting gun head, and the sealing strip is used for sealing the gap between the blocking part and the grouting gun head.

[0033] By adopting the above technical scheme, the sealing strip seals the gap between the blocking part and the grouting gun head, which avoids the cement slurry from leaking into the steel pipe as much as possible, improves the stability of the grouting pressure during grouting, and improves the grouting efficiency.

[0034] In summary, the present application has at least one of the following beneficial technical effects:

[0035] 1. The first round of grouting is performed by the grouting gun head and the directional grouting device to form a connection network between the high-pressure jet grouting pile and the pipe pile, thereby improving the connection effect of the high-pressure jet grouting pile and the pipe pile, and simultaneously reinforcing the backfill soil layer, and the multiple high-pressure jet grouting piles and the multiple pipe piles are connected to each other to protect the drilling and pouring pile position to be constructed; in addition, the second round of grouting is performed to form a cement network for reinforcing the backfill soil layer at the pipe pile, thereby reinforcing the backfill soil layer, and under the comprehensive action of the two aspects, the problems of slurry leakage and hole collapse during the hole forming process when the drilling construction is performed below the steel casing are improved, and the hole forming efficiency is improved.

[0036] 2. The air in the exhaust cavity is pushed out by the flexible sealing sheet driven by the cement slurry, so as to push the directional pipe to move into the soil layer in the direction away from the grouting gun head, the exhaust cavity is reset by pumping the cement slurry, and then the directional pipe is retracted into the steel flower pipe, so that the next cycle of directional grouting is facilitated, the installation efficiency of the overall device is improved, and the efficiency of grouting to the high-pressure jet grouting pile is improved, and the construction period is shortened.

[0037] 3. When the first round of grouting is needed, the two embracing parts are respectively close to each other from both sides of the grouting gun head to form a cylindrical shape, at this time, the blocking part blocks the two ends of the embracing part to form a communication cavity, and finally the flaps on the two embracing parts are connected to each other through the fixing bolts, so that the directional sleeve can be detachably fixed on the grouting gun head, when the second round of grouting is needed, the directional sleeve is removed, and the convenience of construction is improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 is a flowchart of the embodiment of the application.

[0039] Figure 2 is a schematic diagram of the overall structure of the embodiment of the application.

[0040] Figure 3 is a schematic diagram of the structure of the steel flower pipe and the pumping machine in the embodiment of the application.

[0041] Figure 4 is an exploded view of the grouting gun head, the grout stopping ring, the directional grouting device, the limiting ring and the sealing strip in the embodiment of the application.

[0042] Figure 5 is Figure 4 is an enlarged view of part A in

[0043] Fig. 1 is a pile position of a bored pile; Fig. 2 is a pile position of a high-pressure jet grouting pile; Fig. 3 is a flower pipe pile hole; Fig. 4 is a steel flower pipe; 41 is a grout stopping part; 42 is a grouting part; 43 is a sharp head part; Fig. 5 is a directional grouting device; 51 is a directional sleeve; 511 is an embracing part; 512 is a blocking part; 513 is a flap; 514 is a fixing bolt; Fig. 52 is a directional pipe; Fig. 53 is an electric valve; Fig. 54 is a driving part; Fig. 6 is a grouting gun head; Fig. 7 is a grout stopping ring; Fig. 8 is a grouting port; Fig. 9 is a sealing strip; Fig. 10 is a grouting hole; Fig. 11 is a directional hole; Fig. 12 is a grout outlet hole; Fig. 13 is a flexible baffle; Fig. 14 is a limiting ring; Fig. 15 is an elastic part; and Fig. 16 is a pumping machine. DETAILED DESCRIPTION

[0044] The application will be described in further detail below with reference to the accompanying drawings. Figures 1-5 The application will be described in further detail below with reference to the accompanying drawings.

[0045] The embodiment of the application discloses a mountainous high-fill area stratum soil body reinforcing method.

[0046] With reference to Figure 1 A mountainous high-fill area stratum soil body reinforcing method includes the following steps:

[0047] S1. Construction preparation, leveling the construction area, measuring a plurality of high-pressure jet grouting pile pile positions 2 and a plurality of flower pipe pile pile positions on the side of the to-be-constructed bored pile pile position 1, and marking them, the high-pressure jet grouting pile pile positions 2 and the flower pipe pile pile positions are alternately and spacedly arranged.

[0048] With reference to Figure 2 In the embodiment of the present application, three high-pressure jet grouting pile pile positions 2 and three flower pipe pile pile positions are arranged, the three high-pressure jet grouting pile pile positions 2 are arranged in a regular triangle around the to-be-constructed bored pile pile position 1, and the flower pipe pile pile position is located between the two adjacent high-pressure jet grouting pile pile positions 2 and has the same distance to the two adjacent high-pressure jet grouting pile pile positions 2.

[0049] In other embodiments, the number and arrangement of the high-pressure jet grouting pile pile positions 2 and the flower pipe pile pile positions can be adjusted according to the size of the to-be-constructed bored pile pile position 1 and the strength of the backfill soil layer.

[0050] S2. High-pressure jet grouting pile construction, a high-pressure jet grouting pile is formed at the high-pressure jet grouting pile pile position 2, and the lower end of the high-pressure jet grouting pile extends into the soil layer below the backfill soil body. In the actual construction process, the depth of the high-pressure jet grouting pile can be adjusted adaptively according to the thickness of the backfill soil layer and the actual strength of the soil layer below the backfill soil layer, and it is possible to pass through the soil layer in which debris, bricks or garbage and the like are located.

[0051] S3. Steel flower pipe 4 lowering, drilling a flower pipe pile hole 3 at the flower pipe pile pile position, the inner bottom wall of the flower pipe pile hole 3 extends into the soil layer below the backfill soil body, and the diameter of the flower pipe pile hole 3 is smaller than the diameter of the high-pressure jet grouting pile.

[0052] After the drilling of the flower pipe pile hole 3 is completed, the steel flower pipe 4 is customized according to the hole depth and diameter of the flower pipe pile hole 3, and then the customized steel flower pipe 4 is lowered into the flower pipe pile hole 3. In the embodiment of the present application, with reference to Figure 3 , the steel flower pipe 4 includes a pointed head part 43, a grouting part 42 and a grouting stopping part 41 which are connected in sequence, a plurality of grouting holes 10 are formed on the grouting part 42, the plurality of grouting holes 10 are spacedly distributed along the circumference of the grouting part 42, a plurality of directional holes 11 are formed on the grouting part 42 along the length direction thereof, each directional hole 11 includes directional holes 11 respectively facing the two high-pressure jet grouting piles on both sides of the grouting part 42, the diameter of the directional hole 11 is larger than the diameter of the grouting hole 10, the pointed head part 43 is located at the inner bottom wall of the flower pipe pile hole 3, and a grouting outlet hole 12 is formed on the side wall thereof.

[0053] With reference to Figure 3In the embodiment of the present application, the grouting part 42 is provided with two, and each grouting part 42 is provided with two groups of directional holes 11, the hole depth direction of the directional hole 11 is parallel to the connecting line of the circular of the flower pipe pile hole 3 and the circular of the high-pressure rotary jet pile in the same plane, and in other embodiments, the number of grouting parts 42 and the number of groups of directional holes 11 can be adaptively changed according to the actual depth of the flower pipe pile hole 3 and the length of each part.

[0054] S4. First round of grouting; refer to Figure 3 and Figure 4 The steel flower pipe 4 is provided with a grouting gun head 6 for grouting the grouting hole 10 on the steel flower pipe 4, a plurality of grouting ports 8 are formed on the peripheral wall of the grouting gun head 6, and the plurality of grouting ports 8 are uniformly arranged along the circumference of the grouting gun head 6. The grouting gun head 6 is in communication with the external cement slurry source through a pipeline, and the pipeline is in communication with the external cement slurry source through a pumping machine 16 for extracting and supplying cement slurry to the grouting gun head 6. The grouting gun head 6 is provided with a grout stop ring 7 at both ends, and the grout stop ring 7 is made of rubber material. A directional grouting device 5 for directing the cement slurry in the grouting gun head 6 to the high-pressure rotary jet pile is detachably arranged on the grouting gun head 6, the grouting gun head 6 is driven to ascend and descend in the steel flower pipe 4 at intervals, and grouting is performed through the directional grouting device 5.

[0055] Specifically, in the embodiment of the present application, referring to Figure 4 and Figure 5 The directional grouting device 5 includes a directional sleeve 51 detachably fixed on the grouting gun head 6, two directional pipes 52 slidingly penetrating the peripheral wall of the directional sleeve 51, an electric valve 53 for opening and closing the directional pipe 52, and a driving member 54 for driving the directional pipe 52 to move towards or away from the grouting gun head 6. The electric valve 53 is located at one end of the directional pipe 52 outside the directional sleeve 51, the inner wall of the directional sleeve 51 and the outer peripheral wall of the grouting gun head 6 form a communication cavity in communication with the grouting gun head 6, and the two ends of the two directional pipes 52 away from the grouting gun head 6 are respectively movably penetrating two directional holes 11 of the same group of directional holes 11.

[0056] In order to facilitate the installation and removal of the directional sleeve 51, referring to Figure 4 In the embodiment of the present application, the directional sleeve 51 includes two clamping parts 511, a flap 513 fixed on both sides of the clamping part 511, four sealing parts 512, and a fixing bolt 514 for connecting the flap 513 with the flap 513 on the other directional sleeve 51. The two ends of the clamping part 511 are integrally formed with the two sealing parts 512, the communication cavity is surrounded by the outer peripheral wall of the grouting gun head 6, the inner peripheral wall of the two clamping parts 511 and the four sealing parts 512, and the fixing bolt 514 is provided with a plurality of fixing bolts 514, which are arranged at intervals along the length direction of the flap 513.

[0057] In other embodiments, the two embracing parts 511 are hingedly arranged on one side and connected by locking bolts on the other side, and the hinging axis is arranged along the length direction of the embracing part 511.

[0058] Further, in order to improve the sealing effect of the plugging part 512 and the peripheral wall of the grouting gun head 6, referring to Figure 4 , a sealing strip 9 is arranged on the plugging part 512 at the abutting position with the grouting gun head 6, and the sealing strip 9 is used to seal the gap between the plugging part 512 and the grouting gun head 6. The sealing strip 9 is made of rubber material, and the length direction is fixedly attached to the inner arc surface of the plugging part 512.

[0059] In order to facilitate the movement of the directional pipe 52 in the steel flower pipe 4 towards or away from the grouting gun head 6, referring to Figure 4 , the driving part 54 includes a flexible sealing sheet fixedly sleeved on the peripheral wall of the one end of the directional pipe 52 in the electric valve 53. The peripheral wall of the flexible sealing sheet is fixedly connected with the inner wall of the directional sleeve 51, and an exhaust cavity is enclosed between the flexible sealing sheet and the inner wall of the directional sleeve 51, which is in communication with the steel flower pipe 4.

[0060] The air in the exhaust cavity is pushed out by the cement slurry to push the directional pipe 52 to move away from the grouting gun head 6 into the soil layer, and the exhaust cavity is reset by pumping the cement slurry, so as to retract the directional pipe 52 into the steel flower pipe 4.

[0061] Further, in order to cooperate with the reset of the directional pipe 52, referring to Figure 5 , the directional sleeve 51 is provided with an elastic member 15 for driving the directional pipe 52 to move towards the grouting gun head 6. The peripheral wall of the directional pipe 52 outside the directional sleeve 51 is fixedly sleeved with a limiting ring 14, and the elastic member 15 can be a tension spring or an elastic telescopic cylinder. In the embodiment of the application, the elastic member 15 is preferably a tension spring, one end of which is fixedly connected with the outer peripheral wall of the embracing part 511, and the other end is fixedly connected with the limiting ring 14.

[0062] In actual construction, when the directional pipe 52 is grouting from the outside of the steel flower pipe 4 to the high-pressure jet grouting pile, the cement slurry flows back to the directional hole 11 and flows into the steel flower pipe 4, which will cause the grouting hole 10 to be blocked after solidification, referring to Figure 5 , the one end of the directional pipe 52 away from the grouting gun head 6 is sleeved with a flexible baffle 13 for blocking the backflow of the cement slurry. When the one end of the directional pipe 52 away from the grouting gun head 6 is located outside the steel flower pipe 4, the flexible baffle 13 abuts against the inner wall of the steel flower pipe 4 to shield the corresponding directional hole 11 of the directional pipe 52.

[0063] In order to further improve the directional effect of the directional pipe 52 grouting, referring to Figure 5, the opening of the directional pipe 52 away from the end of the grouting gun head 6 is set as a constricted opening, specifically, the opening of the directional pipe 52 away from the end of the grouting gun head 6 is in a waist shape, and the length direction of the opening is parallel to the length direction of the steel flower pipe 4, when the cement slurry moves to the constricted end opening of the directional pipe 52, the flow rate of the cement slurry is accelerated, and the efficiency of the cement slurry flowing towards the high-pressure jet grouting pile is improved.

[0064] In the specific implementation process, before the cement slurry is directionally injected towards the high-pressure jet grouting pile, the electric valve 53 is started to close the directional pipe 52, the pumping machine 16 is started to inject the cement slurry into the communication cavity through the grouting gun head 6, when the end of the directional pipe 52 away from the grouting gun head 6 passes through the directional hole 11, the electric valve 53 is started to open the directional pipe 52; after the cement slurry is directionally injected towards the high-pressure jet grouting pile, the electric valve 53 is started to close the directional pipe 52, the pumping machine 16 is started to extract the cement slurry from the communication cavity through the grouting gun head 6, when the end of the directional pipe 52 away from the grouting gun head 6 is located in the steel flower pipe 4, the grouting gun head 6 is lifted to the next set of directional holes 11, and the above steps are repeated.

[0065] S5. The second round of grouting, the directional grouting device 5 is detached from the grouting gun head 6, the grouting gun head 6 is lifted in the steel flower pipe 4, and the cement slurry injected by the grouting gun head 6 is diffused into the soil layer through the grouting hole 10 on the steel flower pipe 4;

[0066] S6. Grouting, the cement slurry is injected into the steel flower pipe 4, and the grouting is stopped when the cement slurry appears at the hole of the flower pipe pile hole 3.

[0067] The implementation principle of the mountain high fill area stratum soil reinforcement method of the embodiment of the application is as follows: first, according to the site construction conditions, the area to be constructed is leveled, the pile position 1 of the cast-in-place pile, the pile position 2 of the high-pressure jet grouting pile, and the flower pipe pile hole are measured and placed, and are marked, then the high-pressure jet grouting pile is constructed, and the drilling of the flower pipe pile hole 3 is performed, the steel flower pipe 4 is customized and is driven into the flower pipe pile hole 3, then the directional grouting device 5 is installed on the grouting gun head 6 to perform the first round of grouting, after the cement slurry of the first round of grouting is initially set, the directional grouting device 5 is detached, the second round of grouting is performed, after the cement slurry of the second round of grouting is initially set, finally, the grouting is performed into the steel flower pipe 4.

[0068] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, therefore: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A method for reinforcing soil in a high-fill area in a mountainous area, characterized by: The following steps are involved: S1. Construction preparation, leveling the construction area, measuring multiple high-pressure jet grouting pile positions (2) and multiple flower pipe pile positions around the bored pile position (1) to be constructed and marking them, the high-pressure jet grouting pile positions (2) and the flower pipe pile positions are arranged alternately; S2. High-pressure jet grouting pile construction, forming a high-pressure jet grouting pile at the high-pressure jet grouting pile position (2), wherein the lower end of the high-pressure jet grouting pile extends to the soil layer below the backfill soil; S3. The steel flower tube (4) is lowered, and a hole is drilled at the position of the flower tube pile to form a flower tube pile hole (3), the inner bottom wall of the flower tube pile hole (3) extends to the soil layer below the backfill soil, and then the customized steel flower tube (4) is lowered into the flower tube pile hole (3); S4. The first round of grouting; a grouting gun head (6) for grouting the grouting hole (10) on the steel flower tube (4) is provided in a lifting manner in the steel flower tube (4), a grouting ring (7) is provided at both ends of the grouting gun head (6), and a directional grouting device (5) for directional grouting the cement slurry in the grouting gun head (6) toward the high-pressure rotary jet pile is detachably provided on the grouting gun head (6), the grouting gun head (6) is driven to rise and fall in intervals in the steel flower tube (4), and grouting is performed through the directional grouting device (5); S5. The second round of grouting, the directional grouting device (5) is removed from the grouting gun head (6), the grouting gun head (6) is driven to rise and fall in the steel flower tube (4), and the cement slurry injected by the grouting gun head (6) is diffused into the soil layer through the grouting holes (10) on the steel flower tube (4); S6. Grouting: pour cement slurry into the steel flower tube (4). Stop grouting when cement slurry appears at the opening of the flower tube pile hole (3).

2. The method for reinforcing soil in a high-fill area in a mountainous area according to claim 1, characterized in that: The steel flower pipe (4) includes a pointed portion (43), a grouting portion (42) and a grouting stop portion (41) connected in sequence. The grouting portion (42) is provided with a plurality of grouting holes (10), and the plurality of grouting holes (10) are distributed at intervals along the circumference of the grouting portion (42). The grouting portion (42) is provided with a plurality of groups of directional holes (11) along its length direction. Each group of directional holes (11) includes the directional holes (11) respectively arranged toward the high-pressure rotary jet piles on both sides of the grouting portion (42). The pointed portion (43) is located at the inner bottom wall of the flower pipe pile hole (3), and a grouting hole (12) is provided on the side wall.

3. The method for reinforcing soil in a high-fill area in a mountainous area according to claim 2, characterized in that: The directional grouting device (5) comprises a directional sleeve (51) detachably fixedly mounted on the grouting gun head (6), two directional tubes (52) slidably penetrated through the peripheral wall of the directional sleeve (51), an electric valve (53) for opening and closing the directional tubes (52), and a driving member (54) for driving the directional tubes (52) to move toward or away from the grouting gun head (6). The inner wall of the directional sleeve (51) and the outer peripheral wall of the grouting gun head (6) are combined to form a connecting cavity connected to the grouting gun head (6). One end of the two directional tubes (52) away from the grouting gun head (6) is movably penetrated through the two directional holes (11) of the same group of directional holes (11).

4. The method for reinforcing soil in a high-fill area in a mountainous area according to claim 3, characterized in that: The driving member (54) includes a flexible sealing sheet fixedly mounted on the peripheral wall of one end of the directional tube (52) located inside the electric valve (53), the peripheral wall of the flexible sealing sheet being fixedly connected to the inner wall of the directional sleeve (51), the flexible sealing sheet and the inner wall of the directional sleeve (51) forming an exhaust cavity, and the exhaust cavity is communicated with the interior of the steel flower tube (4).

5. The method for reinforcing soil in a high-fill area in a mountainous area according to claim 4, characterized in that: The directional sleeve (51) is provided with an elastic member (15) for driving the directional tube (52) to move in a direction close to the grouting gun head (6).

6. The method for reinforcing soil in a high-fill area in a mountainous area according to claim 3, characterized in that: The end of the directional tube (52) away from the grouting gun head (6) is provided with a flexible baffle (13) for preventing the backflow of cement slurry. When the end of the directional tube (52) away from the grouting gun head (6) is located outside the steel flower tube (4), the flexible baffle (13) shields the directional hole (11) corresponding to the directional tube (52).

7. The method for reinforcing soil in a high-fill area in a mountainous area according to claim 4, characterized in that: Before directionally pouring cement slurry into the high-pressure jet grouting pile in step S4, the electric valve (53) is activated to close the directional tube (52), and cement slurry is injected into the communicating cavity through the grouting gun head (6); when the end of the directional tube (52) away from the grouting gun head (6) passes through the directional hole (11), the electric valve (53) is activated to open the directional tube (52); After directionally pouring cement slurry toward the high-pressure jet grouting pile in step S4, the electric valve (53) is activated to close the directional tube (52), and cement slurry is extracted from the communicating cavity through the grouting gun head (6). When one end of the directional tube (52) away from the grouting gun head (6) is located in the steel flower tube (4), the grouting gun head (6) is driven to rise and fall to the next group of directional holes (11), and the above steps are repeated.

8. The method for reinforcing soil in a high-fill area in a mountainous area according to claim 3, characterized in that: The opening at one end of the directional tube (52) away from the grouting gun head (6) is configured to be in a constricted shape.

9. The method for reinforcing soil in a high-fill area in a mountainous area according to claim 3, characterized in that: The directional sleeve (51) comprises two embracing parts (511), flaps (513) respectively fixed on both sides of the embracing parts (511), four blocking parts (512) and fixing bolts (514) for connecting the flaps (513) and the flaps (513) on another directional sleeve (51). The two ends of the embracing part (511) are respectively integrally formed with the two blocking parts (512). The communicating cavity is formed by the outer peripheral wall of the grouting gun head (6), the inner peripheral walls of the two embracing parts (511) and the four blocking parts (512). A plurality of fixing bolts (514) are provided, and the plurality of fixing bolts (514) are spaced apart along the length direction of the flap (513).

10. The method for reinforcing soil in a high-fill area in a mountainous area according to claim 9, characterized in that: A sealing strip (9) is provided at the portion of the sealing portion (512) abutting against the grouting gun head (6), and the sealing strip (9) is used to seal the gap between the sealing portion (512) and the grouting gun head (6).

Images