Construction method of fiber grating barrel type reinforced compaction pile

Abstract

The invention discloses a construction method of a fiber grating barrel type reinforced compaction pile and belongs to the technical field of constructional engineering.The fiber grating barrel type reinforced compaction pile comprises a fiber grating barrel installed in a hole pile, the fiber grating barrel is filled with pile body padding, and the construction method comprises the following steps that the fiber grating barrel is installed in the hole pile, and the fiber grating barrel is filled with pile body padding; a hoisting mechanism is used for hoisting the auxiliary steel pipe sleeved with the fiber grating barrel into the hole pile, and an annular gap is formed between the fiber grating barrel and the inner wall of the hole pile; the pile body filler is filled in a layered mode and tamped till filling of the whole hole pile is completed, and in the filling process of each layer, after the auxiliary steel pipe is lifted to the preset height, the tamping hammer in a circular truncated cone shape moves up and down multiple times along the inner wall of the auxiliary steel pipe to tamp the pile body filler; and in the tamping process, the fiber grating barrel expands and deforms to abut against the inner wall of the hole pile so as to seal the annular gap. In the tamping process of a tamping machine hammer, the radial pressure between aggregate and the inner wall of a hole pile is enhanced, and therefore the forming quality of the hole pile is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of construction engineering, and in particular relates to a construction method of a fiber grid barrel type reinforced compaction pile. Background Art

[0002] At present, in the foundation treatment of house construction and highway subgrades, traditional (cement soil, gray soil, plain soil, etc.) compaction piles are used, which have the following disadvantages: first, the integrity of the pile body is poor, and it is easy to have problems such as broken piles, shrinkage, poor verticality, and pile body deviation in complex base layers; second, the shear resistance of the pile body is poor, and the pile body is prone to shear failure; third, the vertical bearing capacity of the pile body is low, and the bearing capacity of the composite foundation is not high, making it difficult to use under large load conditions.

[0003] In the prior art, a Chinese patent with announcement number CN220246887U discloses a reinforced recycled coarse aggregate pile for soft soil foundation treatment. By setting an inner layer of a polyethylene fiber core, a filling layer of construction solid waste coarse aggregate, and an outer layer of a geogrid sleeve, the bending and shearing resistance of the pile body is increased by the polyethylene fiber core; the geogrid sleeve is used to form a good constraint on the internal construction solid waste coarse aggregate, limit the lateral deformation of the construction solid waste coarse aggregate, and avoid bulging deformation of the pile body. However, at present, when constructing the above-mentioned piles, a tamping hammer is generally used for compaction. At present, the tamping hammer can only provide downward axial pressure during the compaction process, so that the radial pressure between the aggregate and the inner wall of the pile is relatively weak.

[0004] Therefore, it is necessary to propose a construction method of fiber grid barrel reinforced compaction piles to solve the above problems. Summary of the invention

[0005] In view of this, the object of the present invention is to provide a construction method of fiber grid barrel reinforced compaction piles, which is used to strengthen the radial pressure between aggregate and the inner wall of the pile during the compaction process, thereby improving the forming quality of the pile.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a construction method of a fiber grid barrel type reinforced compacted pile, wherein the fiber grid barrel type reinforced compacted pile comprises a fiber grid barrel installed in a hole pile, wherein the first end of the fiber grid barrel is open and the second end of the fiber grid barrel is closed, and the fiber grid barrel is filled with a pile body filler, wherein the pile body filler is a mixture of cement soil, lime soil, plain soil and long fibers; and the construction method comprises the following steps:

[0008] S1: insert the auxiliary steel pipe from the open end of the fiber grid barrel, and use the lifting mechanism to lift the auxiliary steel pipe with the fiber grid barrel into the hole pile, wherein an annular gap is provided between the fiber grid barrel and the inner wall of the hole pile;

[0009] S2: Fill the pile body filler in layers and tamp it until the entire pile hole is filled. In each layer of filling process, the auxiliary steel pipe is first lifted to a preset height, and then the tamping hammer is driven by an electric winch to move up and down several times along the inner wall of the auxiliary steel pipe to tamp the pile body filler; the backfill thickness of each layer is 280 to 320 mm; and during the tamping process, the fiber grid barrel expands and deforms to close the annular gap, so that the fiber grid barrel is pressed against the inner wall of the pile hole; wherein, the bottom end of the tamping hammer is truncated cone-shaped.

[0010] Furthermore, the ramming hammer is provided with a sliding section that is slidably connected to the inner wall of the auxiliary steel pipe and a ramming section that is fixedly connected to the bottom end of the sliding section as an integral whole. The ramming section is arranged in a truncated cone shape, and is provided with a cavity and a plurality of sliding holes that are circumferentially arranged with the axis of the ramming hammer as the center. The sliding hole is communicated with the cavity, and a plurality of extrusion plates that can extend to the outside of the ramming section are limitedly slidably connected in the sliding hole. A driving mechanism for outputting rotational power is fixedly installed in the sliding section, and a screw is fixedly connected to the output end of the driving mechanism, and the screw is threadedly connected to the sliding section. One end of the screw extends into the cavity and is rotatably connected to a push block arranged in a truncated cone shape. The push block is limitedly slidably connected to the inner wall of the extrusion plate, and the axial movement of the push block can cause the plurality of extrusion plates to move radially along the ramming hammer.

[0011] Furthermore, in the process of layered compaction of the pile body filler, each time the tamping hammer tamps the pile body filler, the tamping section moves to the bottom of the auxiliary steel pipe, and then the driving mechanism is started to rotate the screw to make the push block move axially, thereby driving the extrusion plate to radially extrude the pile body filler; then the driving mechanism is started to return the extrusion plate, the tamping hammer is lifted, and the tamping hammer is rotated by a preset angle, and the above tamping process is repeated until each layer of the pile body filler is compacted, wherein the preset angle is the angle between two adjacent extrusion plates.

[0012] Furthermore, the auxiliary steel pipe is provided with a plurality of circumferentially arranged slide grooves with the axis of the auxiliary steel pipe as the center, the angle between two adjacent slide grooves is consistent with the angle between two adjacent extrusion plates, an arc groove connecting the two adjacent slide grooves is provided between two adjacent slide grooves, the sliding section is provided with a plurality of sliders corresponding to the slide grooves in the circumferential direction, the sliders are slidably connected in the slide grooves, the sliding section is provided with a plurality of limit grooves corresponding to the sliders in the circumferential direction, the sliders are tangentially limited and slidably connected in the limit grooves along the auxiliary steel pipe, a spring is fixedly connected between the slider and the inner wall of the limit groove, and the slider is provided with a first inclined edge matching the arc groove.

[0013] Furthermore, when the ramming hammer tamps the pile body filler, the ramming hammer slides downward along the slide groove to below the bottom end of the arc groove for tamping. When the ramming hammer is lifted upward, the slider rises to cooperate with the bottom end of the arc groove. Continuing to move the ramming hammer upward can enable the slider to drive the ramming hammer to move along the arc groove, so that the ramming hammer rotates until the slider moves from the top of the arc groove to the adjacent slide groove.

[0014] Furthermore, the slide groove includes a first slide section located above the bottom end of the arc groove and a second slide section located below the bottom end of the arc groove, and the width of the second slide section is greater than the width of the first slide block.

[0015] Furthermore, the first sliding section is provided with a second inclined edge away from the arc groove on a side wall away from the top end of the arc groove adjacent thereto.

[0016] The beneficial effects of the present invention are:

[0017] The present invention enables the rammer hammer to strengthen the radial pressure between the aggregate and the inner wall of the hole pile during the tamping process, thereby improving the forming quality of the hole pile.

[0018] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0020] Figure 1 A cross-sectional view of the auxiliary steel pipe and the ramming hammer in cooperation with each other according to an embodiment of the present invention;

[0021] Figure 2 A partial cross-sectional view of the cooperation between the slider and the slide groove according to an embodiment of the present invention;

[0022] Figure 3 is a cross-sectional view of an auxiliary steel pipe according to an embodiment of the present invention;

[0023] Figure 4 It is a structural schematic diagram of the tamping process of an embodiment of the present invention;

[0024] Figure 5 It is a schematic diagram of the fiber grid barrel type reinforced compacted pile structure after tamping is completed according to an embodiment of the present invention.

[0025] The markings in the accompanying drawings are as follows: bored pile 1, fiber grid barrel 2, annular reinforced fiber grid 201, longitudinal fiber grid 202, pile body filler 3, auxiliary steel pipe 4, slide groove 401, arc groove 402, first sliding section 403, second sliding section 404, second inclined edge 405, annular gap 5, ramming hammer 6, sliding section 601, ramming section 602, cavity 603, sliding hole 604, extrusion plate 605, driving mechanism 606, screw 607, push block 608, slider 609, limit groove 610, spring 611, first inclined edge 612. DETAILED DESCRIPTION

[0026] like Figures 1 to 5 As shown, the present invention provides a construction method of a fiber grid barrel type reinforced compacted pile, wherein the fiber grid barrel type reinforced compacted pile comprises a fiber grid barrel 2 installed in a hole pile 1, wherein the first end of the fiber grid barrel 2 is open, and the second end of the fiber grid barrel 2 is closed, and the fiber grid barrel 2 is filled with a pile body filler 3, wherein the pile body filler 3 is a mixture of cement soil, ash soil, plain soil and long fibers, and a reinforcement effect is formed by adding long fibers into the pile body filler 3, thereby enhancing the interlocking and tensile strength of the pile body filler 3; and the pile body filler 3 forms an integral structure under the constraint of the fiber grid barrel 2, and generates a certain pre-pressure, and when subjected to stress, the stress area of ​​the filler increases, and the fiber grid barrel 2 acts as a constraint to prevent the pile body filler 3 from Deformation occurs, thereby improving the compressive resistance of the pile body filler 3. This constraint effect enables the pile body filler 3 to produce higher resistance when subjected to pressure, and forms a silo effect; the fiber grid barrel reinforced compaction pile can increase the single pile bearing capacity of the compaction pile and the bearing capacity of the composite foundation by more than 15%-30%, and increase the bending strength of the pile body by more than 2 times, meeting the needs of large load bearing capacity; at the same time, it plays a role in increasing the lateral shear resistance of the soil layer in large-surface foundation reinforcement, enhancing the integrity of the soil layer, and preventing geological disasters such as landslides and displacements; wherein, the outer peripheral wall of the fiber grid barrel 2 is arranged side by side in the axial direction with multiple annular reinforcing fiber grids 201, and multiple longitudinal fiber grids 202 are arranged circumferentially with the axis of the fiber grid barrel 2 as the center;

[0027] The construction method includes the following steps:

[0028] S1: insert the auxiliary steel pipe 4 from the open end of the fiber grid barrel 2, and use a lifting mechanism to lift the auxiliary steel pipe 4 with the fiber grid barrel 2 into the hole pile 1, wherein an annular gap 5 is provided between the fiber grid barrel 2 and the inner wall of the hole pile 1;

[0029] S2: Fill the pile body filler 3 in layers and tamp it until the entire bored pile 1 is filled, wherein, during each layer of filling, first lift the auxiliary steel pipe 4 to a preset height, and then drive the tamping hammer 6 to move up and down several times along the inner wall of the auxiliary steel pipe 4 by an electric winch to tamp the pile body filler 3; the backfill thickness of each layer is 280 to 320 mm; and during the tamping process, the fiber grid barrel 2 expands and deforms to close the annular gap 5, so that the fiber grid barrel 2 is tightly pressed against the inner wall of the bored pile 1; wherein, the bottom end of the tamping hammer 6 is truncated cone-shaped, so that during the tamping process, the radial extrusion force of the bored pile 1 is provided through the side wall of the tamping hammer 6, so that the pile body filler 3 can squeeze the inner wall of the bored pile 1, thereby ensuring that the fiber grid barrel 2 is tightly pressed against the inner wall of the bored pile 1.

[0030] In one embodiment of the present invention, the ramming hammer 6 is provided with a sliding section 601 slidably connected to the inner wall of the auxiliary steel pipe 4 and a ramming section 602 fixedly connected to the bottom end of the sliding section 601 as a whole, the ramming section 602 is set to be truncated, and a cavity 603 and a plurality of sliding holes 604 arranged circumferentially with the axis of the ramming hammer 6 as the center are provided in the ramming section 602, the sliding hole 604 is connected to the cavity 603, and a plurality of sliding holes 604 that can extend to the outside of the ramming section 602 are limited in sliding connection in the sliding hole 604. The extrusion plate 605 is fixedly installed with a driving mechanism 606 for outputting rotational power in the sliding section 601, and a screw 607 is fixedly connected to the output end of the driving mechanism 606, and the screw 607 is threadedly connected to the sliding section 601. One end of the screw 607 extends into the cavity 603 and is rotatably connected to a push block 608 arranged in a truncated cone shape. The push block 608 is limitedly slidably connected to the inner wall of the extrusion plate 605. The axial movement of the push block 608 can make multiple extrusion plates 605 move radially along the ramming hammer 6;

[0031] In the process of layered compaction of the pile body filler 3, each time the ramming hammer 6 tamps the pile body filler 3, the ramming section 602 moves to the bottom of the auxiliary steel pipe 4, and then the driving mechanism 606 is started to rotate the screw 607, thereby driving the push block 608 to move axially, so as to drive the extrusion plate 605 to radially extrude the pile body filler 3; then the driving mechanism 606 is started to return the extrusion plate 605, the ramming hammer 6 is lifted, and the ramming hammer 6 is rotated by a preset angle, and the above ramming process is repeated, wherein, in the compaction process of each layer, the ramming number of times of the ramming hammer 6 is 8 times, and the preset angle is the angle between two adjacent extrusion plates 605.

[0032] In the present solution, the squeezing plate 605 is moved radially along the ramming hammer 6 each time the pile body filler 3 is rammed, so as to strengthen the squeezing force of the pile body filler 3 on the inner wall of the pile hole 1 and ensure the tightness between the pile body filler 3 and the pile hole 1; and after each ramming, the ramming hammer 6 needs to be rotated by a preset angle so that the pile body filler 3 around the ramming hammer 6 can be squeezed; and the screw 607 is provided to strengthen the stability of the internal structure during the ramming process, so as to avoid the poor stability of the internal structure caused by the vibration generated when the ramming hammer 6 hits the filler.

[0033] In one embodiment of the present invention, a plurality of slide grooves 401 are circumferentially arranged in the auxiliary steel pipe 4 with the axis of the auxiliary steel pipe 4 as the center, the angle between two adjacent slide grooves 401 is consistent with the angle between two adjacent extrusion plates 605, an arc groove 402 connecting the two adjacent slide grooves 401 is arranged between two adjacent slide grooves 401, a plurality of sliders 609 corresponding to the slide grooves 401 are circumferentially arranged on the sliding section 601, the slider 609 is slidably connected in the slide groove 401, a plurality of limiting grooves 610 corresponding to the slider 609 are circumferentially arranged on the sliding section 601, the slider 609 is tangentially limited and slidably connected in the limiting groove 610 along the auxiliary steel pipe 4, a spring 611 is fixedly connected between the slider 609 and the inner wall of the limiting groove 610, and a first inclined edge 612 matching the arc groove 402 is arranged on the slider 609;

[0034] When the ramming hammer 6 tamps the pile body filler 3, the ramming hammer 6 slides downward along the slide groove 401 to the bottom of the bottom end of the arc groove 402 for tamping. When the ramming hammer 6 is lifted upward, the slider 609 rises to cooperate with the bottom end of the arc groove 402. Continuing to move the ramming hammer 6 upward can enable the slider 609 to drive the ramming hammer 6 to move along the arc groove 402, so that the ramming hammer 6 rotates until the slider 609 moves from the top of the arc groove 402 to the adjacent slide groove 401.

[0035] Through the design of the above structure, this solution allows the ramming hammer 6 to automatically rotate to a preset angle during its upward movement, so that when ramming again, the extrusion plate 605 is misaligned with the extrusion plate 605 of the previous ramming process, thereby allowing the pile body filler 3 around the ramming hammer 6 to be squeezed.

[0036] In one embodiment of the present invention, the slide groove 401 includes a first slide section 403 located above the bottom end of the arc groove 402 and a second slide section 404 located below the bottom end of the arc groove 402 , and the width of the second slide section 404 is greater than that of the first slide section 403 .

[0037] In this solution, when the slider 609 slides from above the bottom end of the arc groove 402 to below the bottom end of the arc groove 402, under the action of the spring 611, the slider 609 moves to below the arc groove 402, so that the first inclined edge 612 of the slider 609 can cooperate with the arc groove 402, so that the slider 609 can move along the arc groove 402 during the rising process.

[0038] In one embodiment of the present invention, the first sliding section 403 is provided with a second inclined edge 405 away from the arc groove 402 on a side wall away from the top of the arc groove 402 connected thereto.

[0039] In this solution, when the slider 609 moves out of the top of the arc groove 402 to the first slide section 403, the slider 609 is abutted against the second inclined edge 405 under the action of the spring 611, so that the slider 609 can squeeze the spring 611 while sliding downward along the slide groove 401 to ensure that when the slider 609 moves to the second slide section 404, the slider 609 can abut against the side wall of the arc groove 402.

[0040] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A construction method of a fiber grid barrel reinforced compaction pile, characterized in that: The fiber grid barrel reinforced compacted pile comprises a fiber grid barrel installed in a hole pile, the first end of the fiber grid barrel is open, the second end of the fiber grid barrel is closed, and the fiber grid barrel is filled with a pile body filler, which is a mixture of cement soil, lime soil, plain soil and long fibers; the construction method comprises the following steps: S1: insert the auxiliary steel pipe from the open end of the fiber grid barrel, and use the lifting mechanism to lift the auxiliary steel pipe with the fiber grid barrel into the hole pile, wherein an annular gap is provided between the fiber grid barrel and the inner wall of the hole pile; S2: Fill the pile body filler in layers and tamp it until the entire pile hole is filled. In each layer of filling process, the auxiliary steel pipe is first lifted to a preset height, and then the tamping hammer is driven by an electric winch to move up and down several times along the inner wall of the auxiliary steel pipe to tamp the pile body filler; the backfill thickness of each layer is 280 to 320 mm; and during the tamping process, the fiber grid barrel expands and deforms to close the annular gap, so that the fiber grid barrel is pressed against the inner wall of the pile hole; wherein, the bottom end of the tamping hammer is truncated cone-shaped.

2. The construction method of the fiber grid barrel type reinforced compaction pile according to claim 1 is characterized by: The ramming hammer is provided with a sliding section that is slidably connected to the inner wall of the auxiliary steel pipe and a ramming section that is fixedly connected to the bottom end of the sliding section as an integral whole. The ramming section is arranged in a truncated cone shape, and a cavity and a plurality of sliding holes that are circumferentially arranged with the axis of the ramming hammer as the center are arranged in the ramming section. The sliding hole is communicated with the cavity, and a plurality of extrusion plates that can extend to the outside of the ramming section are limitedly and slidably connected in the sliding hole. A driving mechanism for outputting rotational power is fixedly installed in the sliding section, and a screw is fixedly connected to the output end of the driving mechanism, and the screw is threadedly connected to the sliding section. One end of the screw extends into the cavity and is rotatably connected to a push block arranged in a truncated cone shape. The push block is limitedly and slidably connected to the inner wall of the extrusion plate, and axial movement of the push block can cause the plurality of extrusion plates to move radially along the ramming hammer.

3. The construction method of the fiber grid barrel type reinforced compaction pile according to claim 2 is characterized by: In the process of layered compaction of the pile body filler, each time the tamping hammer tamps the pile body filler, the tamping section moves to the bottom of the auxiliary steel pipe, and then the driving mechanism is started to rotate the screw to make the push block move axially, so as to drive the extrusion plate to radially extrude the pile body filler; then the driving mechanism is started to return the extrusion plate, the tamping hammer is lifted, and the tamping hammer is rotated by a preset angle, and the above tamping process is repeated until each layer of the pile body filler is compacted, wherein the preset angle is the angle between two adjacent extrusion plates.

4. The construction method of the fiber grid barrel type reinforced compaction pile according to claim 3 is characterized by: The auxiliary steel pipe is provided with a plurality of circumferentially arranged slide grooves with the axis of the auxiliary steel pipe as the center, the angle between two adjacent slide grooves is consistent with the angle between two adjacent extrusion plates, an arc groove connecting the two adjacent slide grooves is provided between two adjacent slide grooves, the sliding section is provided with a plurality of sliders corresponding to the slide grooves in the circumferential direction, the sliders are slidably connected in the slide grooves, the sliding section is provided with a plurality of limiting grooves corresponding to the sliders in the circumferential direction, the sliders are tangentially limited and slidably connected in the limiting grooves along the auxiliary steel pipe, a spring is fixedly connected between the slider and the inner wall of the limiting groove, and the slider is provided with a first inclined edge matching the arc groove.

5. The construction method of fiber grid barrel type reinforced compaction pile according to claim 4 is characterized by: When the ramming hammer tamps the pile body filler, the ramming hammer slides downward along the slide groove to the bottom of the bottom end of the arc groove for tamping. When the ramming hammer is lifted upward, the slider rises to cooperate with the bottom end of the arc groove. Continuing to move the ramming hammer upward can enable the slider to drive the ramming hammer to move along the arc groove, so that the ramming hammer rotates until the slider moves from the top of the arc groove to the adjacent slide groove.

6. The construction method of fiber grid barrel type reinforced compaction pile according to claim 5, characterized in that: The sliding groove comprises a first sliding section located above the bottom end of the arc groove and a second sliding section located below the bottom end of the arc groove, and the width of the second sliding section is greater than the width of the first sliding block.

7. The construction method of fiber grid barrel type reinforced compaction pile according to claim 6, characterized in that: The first sliding section is provided with a second inclined edge away from the arc groove on a side wall away from the top end of the arc groove adjacent thereto.

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