A trenchless micro pile group / bundled pile sheet wall support structure and construction method
The trenchless micro pile group/bundled pile sheet wall support structure addresses the lack of effective slope protection in expansive soil and loess areas by using interconnected micropile units and reinforced concrete connectors to form a reinforced concrete slab surface layer, effectively resisting shear forces.
Patent Information
- Application Number
- CN202010996235.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-09-21
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2040-09-21
AI Technical Summary
Existing micro piles are primarily used for protecting rock layers at the bottom of excavation areas and lack effective methods for slope protection in non-excavation areas, especially in expansive soil and loess areas, where they are susceptible to strong expansion forces.
A trenchless micro pile group/bundled pile sheet wall support structure comprising upper, middle, and lower micropile assembly units, each with specific features: each assembly unit, including an upper micropile assembly unit, a middle micropile assembly unit, and a lower micropile assembly unit, connected by reinforced concrete connectors, with each unit comprising micropiles, spiral piles, and support bodies, and constructed using grouting pipes, steel cages, and concrete slurry to form a reinforced concrete slab surface layer.
The structure effectively resists downward shear forces on slopes, particularly in expansive soil and loess areas, by utilizing upper, middle, and lower micropile groups to form a reinforced concrete slab surface layer, enhancing slope protection without the need for extensive drilling.
Smart Images
Figure CN111926834B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of slope protection technology, in particular to a slope protection technology in loess areas, and specifically to a trenchless micro pile group / bundled pile board wall support structure and a construction method. Background Art
[0002] Micro piles generally refer to small-diameter bored piles with a pile diameter of 70 to 300 mm, and their slenderness is relatively large. Only light construction machinery is needed for construction, and the pile position arrangement is flexible, the construction speed is fast, the adaptability to the construction site is strong, and the impact on the environment is small. In recent years, it has been continuously used in landslide control, slope reinforcement and other projects.
[0003] The construction operation of micro piles is mainly divided into four stages. The first is that the drilling rig drills holes as required. The second is an uninterrupted cleaning process of the holes during the entire process of drilling and before grouting. The third is to put in steel bars as required. The fourth is grouting and closing the top plate.
[0004] Since the existing micropiles are generally only used to construct micropile groups at the bottom of the excavation area, they are only aimed at protecting the rock layer. In some non-excavation areas, especially in areas with strong expansion force and loess areas, there are no relevant technical means for slope protection. Summary of the invention
[0005] The object of the present invention is to provide a trenchless micro pile group / bundled pile sheet wall support structure and a construction method to solve the problems raised in the above-mentioned background technology.
[0006] To achieve the above object, the present invention provides the following technical solutions:
[0007] A trenchless micro pile group / bundle pile sheet wall support structure, comprising
[0008] At least one micropile assembly unit fixed in the slope protection body,
[0009] Each micropile assembly unit at least includes an upper micropile group, a medium micro spiral pile group and a lower micropile group arranged from top to bottom on the slope protection body on the same slope, and the upper micropile group, the medium micro spiral pile group and the lower micropile group are fixed by concrete connectors, and the upper micropile group, the medium micro spiral pile group and the lower micropile group in each micropile assembly unit are connected by pouring reinforced concrete on the surface based on the concrete connector to form a unit of reinforced concrete slab surface layer.
[0010] Furthermore, the upper micropile group includes an upper grouting pipe with multiple unit modules constructed on the same horizontal line along the slope protection body, an upper support body is constructed along the inner wall of the upper grouting pipe, sand and gravel concrete slurry is poured into the bottom of each upper grouting pipe and compacted to construct a first base, an upper steel cage is lowered along the inner side of the upper support body to the first base, and sand and gravel concrete is poured along the inner and outer sides of the upper steel cage to form an upper micropile unit module.
[0011] Furthermore, the medium and micro-sized spiral pile group includes a medium spiral grouting pipe with multiple unit modules constructed on the same horizontal line along the slope protection body, a flexible support body is constructed along the inner wall of the medium spiral grouting pipe, sand and gravel concrete slurry is poured into the bottom of each medium spiral grouting pipe and compacted to construct a second base, a medium steel cage is lowered along the inner side of the flexible support body to the second base, and sand and gravel concrete is poured along the inner and outer sides of the medium spiral grouting pipe to form a medium spiral pile unit module.
[0012] Furthermore, the lower micro pile group includes a lower grouting pipe that constructs a plurality of unit modules on the same horizontal line along the slope protection body, a lower support body is constructed along the inner wall of the lower grouting pipe, sand and gravel concrete slurry is poured into the bottom of each lower grouting pipe and compacted to construct a third base, a steel cage is lowered along the inner side of the lower support body to the third base, and sand and gravel concrete is poured along the inner and outer sides of the lower steel cage to form a lower micro pile unit module.
[0013] Furthermore, the upper support body includes an upper ring-type support member fixed along the inner wall of an upper grouting pipe, the upper ring-type support members are fixed by a plurality of upper anchor rods, an upper steel cage is placed inside and below the upper ring-type support member, and sand and gravel concrete is poured along the inner and outer sides of the upper steel cage to form an upper micropile unit module, and an upper locking device is arranged at the top of each upper anchor rod, and an upper inclined hole is arranged on the upper locking device, and an upper inclined anchor rod supporting the upper anchor rod is arranged along the upper inclined hole, the upper inclined anchor rod passes through the upper grouting pipe and is fixed inside the slope protection body, and the upper inclined anchor rod and the upper anchor rod form a "human" shaped support structure.
[0014] Furthermore, the flexible support body includes a fiber grid fixed along the inner wall of the middle spiral grouting pipe, a middle steel cage is lowered inside the fiber grid to the second base, and sand and gravel concrete is poured along the inside and outside of the middle spiral grouting pipe to form a middle spiral pile unit module.
[0015] Furthermore, the fiber mesh is one of carbon fiber or glass fiber.
[0016] Furthermore, the lower support body includes a lower geotextile fixed along the inner wall of the upper grouting pipe, a lower ring-type support member is arranged along the inner side of the lower geotextile, the lower ring-type support members are fixed by multiple lower anchor rods, a lower steel cage is arranged below the lower ring-type support member, sand and gravel concrete is poured along the inner and outer sides of the lower steel cage to form a lower micro pile unit module, a lower lock is arranged at the top of each lower anchor rod, a lower inclined hole is arranged on the lower lock, and a lower inclined anchor rod supporting the lower anchor rod is arranged along the lower inclined hole, the lower inclined anchor rod passes through the lower grouting pipe and is fixed inside the slope protection body, and the lower inclined anchor rod and the lower anchor rod form a "human" shaped support structure.
[0017] The present invention also provides a construction method of a trenchless micro pile group / bundled pile sheet wall support structure, which is characterized by comprising the following steps:
[0018] Step 1) Drilling:
[0019] Drill straight holes on the same horizontal line along the upper end of the slope protection body to construct multiple upper grouting pipes of unit modules.
[0020] At the lower part of the upper grouting pipes of the multiple unit modules and on the same horizontal line, the middle spiral grouting pipes of the multiple unit modules are constructed.
[0021] and constructing lower grouting pipes of multiple unit modules on the same horizontal line of the middle spiral micropile groups of multiple unit modules;
[0022] Step 2) Constructing micro pile groups:
[0023] An upper support body is constructed along the inner wall of the upper grouting pipe, sand and gravel concrete slurry is poured into the bottom of each upper grouting pipe and compacted to construct a first base, an upper steel cage is lowered along the inner side of the upper support body to the first base, sand and gravel concrete is poured along the inner and outer sides of the upper steel cage to form an upper micropile unit module, and a first connecting piece of an I-beam is cast on a certain section in the middle of the upper micropile unit module.
[0024] A flexible support body is constructed along the inner wall of the middle spiral grouting pipe, sand and gravel concrete slurry is poured into the bottom of each middle spiral grouting pipe and compacted to construct a second base, a middle steel cage is lowered along the inner side of the flexible support body to the second base, sand and gravel concrete is poured into the inner and outer sides of the middle spiral grouting pipe to form a middle spiral pile unit module, and a second connecting piece of I-beam is cast on the top surface of the middle spiral pile unit module, and a third connecting piece of I-beam is cast on a certain section in the middle of the middle spiral pile unit module, and the second connecting piece is on the same horizontal plane as the first connecting piece;
[0025] Construct a lower support body along the inner wall of the lower grouting pipe, pour sand and gravel concrete slurry into the bottom of each lower grouting pipe and tamp it to construct a third base, lower a steel cage along the inner side of the lower support body to the third base, pour sand and gravel concrete along the inner and outer sides of the lower steel cage to form a lower micropile unit module, and cast a fourth connecting piece of I-beam on the top surface of the lower micropile unit module, and the fourth connecting piece and the third connecting piece are on the same horizontal plane;
[0026] Step 3) Constructing concrete connectors:
[0027] A right-angled surface is formed by excavating the top of the middle screw pile unit module toward the upper micro pile unit module, so that the second connecting member and the first connecting member are on the same horizontal plane, the second connecting member and the first connecting member are used to construct an I-beam to form a first concrete cage, and concrete is poured into the first concrete cage to form a first face seat, and a right-angled surface is formed by excavating the top of the lower micro pile unit module toward the middle screw pile unit module, so that the third connecting member and the fourth connecting member are on the same horizontal plane, the third connecting member and the fourth connecting member are used to construct an I-beam to form a second concrete cage, and concrete is poured into the second concrete cage to form a second face seat, so that the upper micro pile and the middle micro screw pile are connected through the first face seat, and a plurality of first face seats are connected to form a first micro pile group slab wall base, so that the upper micro pile group and the middle micro screw pile group are connected through the first micro pile group slab wall base, the middle micro screw pile and the lower micro pile are connected through the second face seat, and a plurality of second face seats are connected to form a second micro pile group slab wall base, so that the middle micro screw pile group and the lower micro pile group are connected through the first micro pile group slab wall base,
[0028] Step 4) Construct the reinforced concrete slab surface layer:
[0029] Reinforced concrete is poured upward with the first micro pile group slab wall base and the first micro pile group slab wall base as the base, so that the upper micro pile group, the middle micro spiral pile group and the upper end of the lower micro pile group form a reinforced concrete slab surface layer at the same level.
[0030] Further, in step 2),
[0031] The construction of the upper support includes
[0032] The upper geotextile is fixed along the inner wall of the upper grouting pipe.
[0033] Inserting a plurality of upper anchor rods into a plurality of upper ring-type support members and extending them downward to the upper grouting pipe;
[0034] Flexible support structure includes
[0035] The geotextile fixed along the inner wall of the spiral grouting pipe,
[0036] A fiber grid set along the inside of the geotextile;
[0037] The construction of the lower support includes
[0038] The lower geotextile fixed along the inner wall of the lower grouting pipe,
[0039] A plurality of lower anchor rods are inserted into a plurality of lower ring-type support members and lowered into a lower grouting pipe.
[0040] Compared with the prior art, the present invention has the following beneficial effects:
[0041] In the present invention, the upper micropile group is used to resist the downward shear force of the slope [the force generated by sliding down], the middle spiral micropile is used to support the upper micropile group and to form a second line to resist the downward shear force of the slope, the lower micropile group is used to support the upper micropile group and the middle spiral micropile and to form a third line to resist the downward shear force of the slope, and the lower micropile group supports the upper micropile group.
[0042] The present invention can be applied to slope protection in non-excavation areas, especially to slope protection in expansive soil areas and loess areas. In slope protection in expansive soil areas and loess areas, holes are directly drilled, and support members are constructed in the completed holes. Suitable flexible support members can also be selected according to the matrix of the protected slope, thus saving the construction process of drilling holes. BRIEF DESCRIPTION OF THE DRAWINGS
[0043] Figure 1 It is a structural diagram of the present invention;
[0044] Figure 2 The present invention Figure 1 A magnified image of
[0045] Figure 3 It is a structural diagram of the upper micro pile in the present invention;
[0046] Figure 4 is a top view of the upper micropile in the present invention;
[0047] Figure 5 It is a top view of the micro pile combination unit in the present invention. DETAILED DESCRIPTION
[0048] The present invention is described in detail below with reference to the accompanying drawings.
[0049] Reference Figures 1 to 5 The present invention provides a trenchless micropile group / bundle pile sheet wall support structure, comprising at least one micropile assembly unit fixed in a slope protection body 1,
[0050] Each micropile assembly unit at least includes an upper micropile group 2, a middle micro spiral pile group 3 and a lower micropile group 4 arranged from top to bottom on a slope protection body 1 on the same slope, wherein the upper micropile group 2, the middle micro spiral pile group 3 and the lower micropile group 4 are fixed by concrete connectors, and the upper micropile group 2, the middle micro spiral pile group 3 and the lower micropile group 4 in each micropile assembly unit are connected by pouring reinforced concrete on the surface based on the concrete connector to form a unit of reinforced concrete slab surface layer 5.
[0051] In the above, the upper micro pile group 2 includes an upper grouting pipe with multiple unit modules constructed on the same horizontal line along the slope protection body, an upper support body is constructed along the inner wall of the upper grouting pipe, sand and gravel concrete slurry is poured into the bottom of each upper grouting pipe and compacted to construct the first base 23, an upper steel cage 29 is lowered along the inner side of the upper support body to the first base 23, and sand and gravel concrete is poured along the inner and outer sides of the upper steel cage 29 to form an upper micro pile unit module 20.
[0052] The upper support body includes an upper geotextile 25 fixed along the inner wall of the upper grouting pipe, an upper ring-type support member 24 is arranged along the inner side of the upper geotextile 25, and the upper ring-type support members 24 are fixed by multiple upper anchor rods 26. An upper steel cage 29 is arranged below the inner part of the upper ring-type support member 24, and sand and gravel concrete is poured along the inner and outer sides of the upper steel cage 29 to form an upper micropile unit module. An upper lock 27 is arranged at the top of each upper anchor rod, and an upper inclined hole is arranged on the upper lock 27. An upper inclined anchor rod 28 supporting the upper anchor rod is arranged along the upper inclined hole. The upper inclined anchor rod 28 passes through the upper grouting pipe and is fixed inside the slope protection body 1, and the upper inclined anchor rod 28 and the upper anchor rod 26 form a "human" shaped support structure.
[0053] In the above, the medium and micro-screw pile group 3 includes a medium spiral grouting pipe with multiple unit modules constructed on the same horizontal line along the slope protection body, a flexible support body 31 is constructed along the inner wall of the medium spiral grouting pipe, sand and gravel concrete slurry is poured into the bottom of each medium spiral grouting pipe and compacted to construct a second base 32, a medium steel cage is lowered along the inner side of the flexible support body 31 to the second base 32, and sand and gravel concrete is poured along the inner and outer sides of the medium spiral grouting pipe to form a medium spiral pile unit module 30.
[0054] The flexible support body 31 includes a geotextile fixed along the inner wall of the middle spiral grouting pipe, a fiber grid arranged along the inner side of the geotextile, a middle steel cage is lowered inside the fiber grid to the second base, and sand and gravel concrete is poured along the inner and outer sides of the middle spiral grouting pipe to form a middle spiral pile unit module.
[0055] The fiber mesh is one of carbon fiber or glass fiber.
[0056] In the above, the lower micro pile group 4 includes a lower grouting pipe that constructs a plurality of unit modules on the same horizontal line along the slope protection body, a lower support body 42 is constructed along the inner wall of the lower grouting pipe, sand and gravel concrete slurry is poured into the bottom of each lower grouting pipe and compacted to construct a third base 43, a steel cage 40 is lowered along the inner side of the lower support body 43 to the third base 43, and sand and gravel concrete is poured along the inner and outer sides of the lower steel cage 43 to form a lower micro pile unit module 41.
[0057] The specific structure of the lower support body 42 is the same as that of the upper support body. The lower support body 42 includes a lower geotextile fixed along the inner wall of the upper grouting pipe, a lower ring-type support member is arranged along the inner side of the lower geotextile, and the lower ring-type support members are fixed by multiple lower anchor rods. A lower steel cage is arranged below the lower ring-type support member, and sand and gravel concrete is poured along the inner and outer sides of the lower steel cage to form a lower micropile unit module. A lower lock is arranged at the top of each lower anchor rod, and a lower inclined hole is arranged on the lower lock rod. A lower inclined anchor rod supporting the lower anchor rod is arranged along the lower inclined hole, and the lower inclined anchor rod passes through the lower grouting pipe and is fixed inside the slope protection body, and the lower inclined anchor rod and the lower anchor rod form a "human" shaped support structure.
[0058] In the present invention, the upper micropile group is used to resist the downward shear force of the slope [the force generated by sliding down], the middle spiral micropile is used to support the upper micropile group and to form a second line to resist the downward shear force of the slope, the lower micropile group is used to support the upper micropile group and the middle spiral micropile and to form a third line to resist the downward shear force of the slope, and the lower micropile group supports the upper micropile group.
[0059] Example 1
[0060] The present invention also provides a construction method of a trenchless micro pile group / bundle pile sheet wall support structure, which is applicable to slopes formed by expansive soil areas and loess areas, and comprises the following steps:
[0061] Step 1) Drilling:
[0062] Drill straight holes on the same horizontal line along the upper end of the slope protection body to construct multiple upper grouting pipes of unit modules.
[0063] At the lower part of the upper grouting pipes of the multiple unit modules and on the same horizontal line, the middle spiral grouting pipes of the multiple unit modules are constructed.
[0064] and constructing lower grouting pipes of multiple unit modules on the same horizontal line of the middle spiral micropile groups of multiple unit modules;
[0065] Step 2) Constructing micro pile groups:
[0066] An upper support body is constructed along the inner wall of the upper grouting pipe, sand and gravel concrete slurry is poured into the bottom of each upper grouting pipe and compacted to construct a first base, an upper steel cage is lowered along the inner side of the upper support body to the first base, sand and gravel concrete is poured along the inner and outer sides of the upper steel cage to form an upper micropile unit module, and a first connecting piece of an I-beam is cast on a certain section in the middle of the upper micropile unit module.
[0067] A flexible support body is constructed along the inner wall of the middle spiral grouting pipe, sand and gravel concrete slurry is poured into the bottom of each middle spiral grouting pipe and compacted to construct a second base, a middle steel cage is lowered along the inner side of the flexible support body to the second base, sand and gravel concrete is poured into the inner and outer sides of the middle spiral grouting pipe to form a middle spiral pile unit module, and a second connecting piece of I-beam is cast on the top surface of the middle spiral pile unit module, and a third connecting piece of I-beam is cast on a certain section in the middle of the middle spiral pile unit module, and the second connecting piece is on the same horizontal plane as the first connecting piece;
[0068] Construct a lower support body along the inner wall of the lower grouting pipe, pour sand and gravel concrete slurry into the bottom of each lower grouting pipe and tamp it to construct a third base, lower a steel cage along the inner side of the lower support body to the third base, pour sand and gravel concrete along the inner and outer sides of the lower steel cage to form a lower micropile unit module, and cast a fourth connecting piece of I-beam on the top surface of the lower micropile unit module, and the fourth connecting piece and the third connecting piece are on the same horizontal plane;
[0069] Step 3) Constructing concrete connectors:
[0070] A right-angled surface is formed by excavating the top of the middle screw pile unit module toward the upper micro pile unit module, so that the second connecting member and the first connecting member are on the same horizontal plane, the second connecting member and the first connecting member are used to construct an I-beam to form a first concrete cage, and concrete is poured into the first concrete cage to form a first face seat, and a right-angled surface is formed by excavating the top of the lower micro pile unit module toward the middle screw pile unit module, so that the third connecting member and the fourth connecting member are on the same horizontal plane, the third connecting member and the fourth connecting member are used to construct an I-beam to form a second concrete cage, and concrete is poured into the second concrete cage to form a second face seat, so that the upper micro pile and the middle micro screw pile are connected through the first face seat, and a plurality of first face seats are connected to form a first micro pile group slab wall base, so that the upper micro pile group and the middle micro screw pile group are connected through the first micro pile group slab wall base, the middle micro screw pile and the lower micro pile are connected through the second face seat, and a plurality of second face seats are connected to form a second micro pile group slab wall base, so that the middle micro screw pile group and the lower micro pile group are connected through the first micro pile group slab wall base,
[0071] Step 4) Construct the reinforced concrete slab surface layer:
[0072] Reinforced concrete is poured upward with the first micro pile group slab wall base and the first micro pile group slab wall base as the base, so that the upper micro pile group, the middle micro spiral pile group and the upper end of the lower micro pile group form a reinforced concrete slab surface layer at the same level.
[0073] Further, in step 2),
[0074] The construction of the upper support includes
[0075] The upper geotextile fixed along the inner wall of the upper grouting pipe,
[0076] Inserting a plurality of upper anchor rods into a plurality of upper ring-type support members and extending them downward to the upper grouting pipe;
[0077] Flexible support structure includes
[0078] The geotextile fixed along the inner wall of the spiral grouting pipe,
[0079] A fiber grid set along the inside of the geotextile;
[0080] The construction of the lower support includes
[0081] The lower geotextile fixed along the inner wall of the lower grouting pipe,
[0082] A plurality of lower anchor rods are inserted into a plurality of lower ring-type support members and lowered into a lower grouting pipe.
[0083] Example 2
[0084] The present invention also provides a construction method of a trenchless micro pile group / bundle pile sheet wall support structure, which is suitable for slope protection with rock formations and comprises the following steps:
[0085] Step 1) Drilling:
[0086] Drill straight holes on the same horizontal line along the upper end of the slope protection body to construct multiple upper grouting pipes of unit modules.
[0087] At the lower part of the upper grouting pipes of the multiple unit modules and on the same horizontal line, the middle grouting pipes of the multiple unit modules are constructed.
[0088] and constructing multiple lower grouting pipes of the unit modules on the same horizontal line of the medium and micro pile groups of the unit modules;
[0089] Step 2) Constructing micro pile groups:
[0090] An upper steel cage is lowered along the inner side of the inner wall of the upper grouting pipe to the first base, and sand and gravel concrete is poured along the inner and outer sides of the upper steel cage to form an upper micropile unit module, and a first connecting piece of an I-beam is cast on a certain section in the middle of the upper micropile unit module.
[0091] Lowering the middle steel cage along the inner wall of the middle grouting pipe to the second base, pouring sand and gravel concrete along the inner and outer sides of the middle grouting pipe to form a middle and micro pile unit module, and pouring a second connecting piece of I-beam on the top surface of the middle and micro pile unit module, pouring a third connecting piece of I-beam on a certain section in the middle of the middle and micro pile unit module, and the second connecting piece and the first connecting piece are on the same horizontal plane;
[0092] A steel cage is lowered along the inner side of the inner wall of the lower grouting pipe to the third base, and sand and gravel concrete is poured along the inner and outer sides of the lower steel cage to form a lower micropile unit module, and a fourth connecting piece of I-beam is poured on the top surface of the lower micropile unit module, and the fourth connecting piece is on the same horizontal plane as the third connecting piece;
[0093] Step 3) Constructing concrete connectors:
[0094] Excavate a right angle surface from the top of the medium and micro pile unit module to the upper micro pile unit module, so that the second connecting member and the first connecting member are on the same horizontal plane, use the second connecting member and the first connecting member to construct an I-beam to form a first concrete cage, and pour concrete into the first concrete cage to form a first face seat, and excavate a right angle surface from the top of the lower micro pile unit module to the medium and micro pile unit module, so that the third connecting member and the fourth connecting member are on the same horizontal plane, use the third connecting member and the fourth connecting member to construct an I-beam to form a second concrete cage, and pour concrete into the second concrete cage to form a second face seat, so that the upper micro pile and the medium and micro piles are connected through the first face seat, and multiple first face seats are connected to form a first micro pile group slab wall base, so that the upper micro pile group and the medium and micro pile group are connected through the first micro pile group slab wall base, and the medium and micro piles and the lower micro piles are connected through the second face seat, and multiple second face seats are connected to form a second micro pile group slab wall base, so that the medium and micro pile group and the lower micro pile group are connected through the first micro pile group slab wall base,
[0095] Step 4) Construct the reinforced concrete slab surface layer:
[0096] Reinforced concrete is poured upward with the first micropile group slab wall base and the first micropile group slab wall base as the base, so that the upper micropile group, the middle micropile group and the upper end of the lower micropile group form a reinforced concrete slab surface layer at the same level.
[0097] The difference between Example 1 and Example 2 is that in the slope protection of the expansive soil area and the loess area in the non-excavation area, the drilled holes need to be reinforced, while in the rock layer area in Example 2, this step is not required.
[0098] The present invention can be applied to slope protection in non-excavation areas, especially to slope protection in expansive soil areas and loess areas. In slope protection in expansive soil areas and loess areas, holes are directly drilled, and support members are constructed in the completed holes. Suitable flexible support members can also be selected according to the matrix of the protected slope, thus saving the construction process of drilling holes.
[0099] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.
Claims
1. A construction method of a trenchless micro pile group / bundle pile sheet wall support structure, characterized in that: The steps include: Step 1) Drilling: Drill straight holes on the same horizontal line along the upper end of the slope protection body to construct multiple upper grouting pipes of unit modules. At the lower part of the upper grouting pipes of the multiple unit modules and on the same horizontal line, the middle spiral grouting pipes of the multiple unit modules are constructed. and constructing lower grouting pipes of multiple unit modules at the lower part of the middle spiral grouting pipes of multiple unit modules and on the same horizontal line; Step 2) Constructing micro pile groups: An upper support body is constructed along the inner wall of the upper grouting pipe, sand and gravel concrete slurry is poured into the bottom of each upper grouting pipe and compacted to construct a first base, an upper steel cage is lowered along the inner side of the upper support body to the first base, sand and gravel concrete is poured along the inner and outer sides of the upper steel cage to form an upper micropile unit module, and a first connecting piece of an I-beam is cast on a certain section in the middle of the upper micropile unit module. A flexible support body is constructed along the inner wall of the middle spiral grouting pipe, sand and gravel concrete slurry is poured into the bottom of each middle spiral grouting pipe and compacted to construct a second base, a middle steel cage is lowered along the inner side of the flexible support body to the second base, sand and gravel concrete is poured into the inner and outer sides of the middle spiral grouting pipe to form a middle spiral pile unit module, and a second connecting piece of I-beam is cast on the top surface of the middle spiral pile unit module, and a third connecting piece of I-beam is cast on a certain section in the middle of the middle spiral pile unit module, and the second connecting piece is on the same horizontal plane as the first connecting piece; Construct a lower support body along the inner wall of the lower grouting pipe, pour sand and gravel concrete slurry into the bottom of each lower grouting pipe and tamp it to construct a third base, lower a steel cage along the inner side of the lower support body to the third base, pour sand and gravel concrete along the inner and outer sides of the lower steel cage to form a lower micropile unit module, and cast a fourth connecting piece of I-beam on the top surface of the lower micropile unit module, and the fourth connecting piece and the third connecting piece are on the same horizontal plane; Step 3) Construct the concrete connector: A right-angled surface is formed by excavating the top of the middle screw pile unit module toward the upper micro pile unit module, so that the second connecting member and the first connecting member are on the same horizontal plane, the second connecting member and the first connecting member are used to construct an I-steel to form a first concrete cage, and concrete is poured into the first concrete cage to form a first face seat, and a right-angled surface is formed by excavating the top of the lower micro pile unit module toward the middle screw pile unit module, so that the third connecting member and the fourth connecting member are on the same horizontal plane, the third connecting member and the fourth connecting member are used to construct an I-steel to form a second concrete cage, and concrete is poured into the second concrete cage to form a second face seat, so that the upper micro pile and the middle micro screw pile are connected through the first face seat, and a plurality of first face seats are connected to form a first micro pile group slab wall base, so that the upper micro pile group and the middle micro screw pile group are connected through the first micro pile group slab wall base, the middle micro screw pile and the lower micro pile are connected through the second face seat, and a plurality of second face seats are connected to form a second micro pile group slab wall base, so that the middle micro screw pile group and the lower micro pile group are connected through the second micro pile group slab wall base, Step 4) Construct the reinforced concrete slab surface layer: Reinforced concrete is poured upward with the first micropile group slab wall base and the second micropile group slab wall base as the base, so that the upper micropile group, the middle micro spiral pile group and the upper end of the lower micropile group form a reinforced concrete slab surface layer at the same level.
2. The construction method according to claim 1, characterized in that: In step 2), The construction of the upper support includes Multiple upper ring supports fixed along the inner wall of the upper grouting pipe, Inserting a plurality of upper anchor rods into a plurality of upper ring-type support members and lowering them into an upper grouting pipe; Flexible support structure includes A fiber mesh fixed along the inner wall of the spiral grouting pipe; The construction of the lower support includes The lower ring support is fixed along the inner wall of the lower grouting pipe. A plurality of lower anchor rods are inserted into a plurality of lower ring-type support members and lowered into a lower grouting pipe.
3. A trenchless micro pile group / bundle pile sheet wall support structure, formed by the construction method of the trenchless micro pile group / bundle pile sheet wall support structure according to any one of claims 1 to 2, characterized in that: include At least one micropile assembly unit fixed in the slope protection body, Each micropile assembly unit at least includes an upper micropile group, a middle micro spiral pile group and a lower micropile group arranged from top to bottom on the slope protection body on the same slope, and the upper micropile group, the middle micro spiral pile group and the lower micropile group are fixed by concrete connectors, and the upper micropile group, the middle micro spiral pile group and the lower micropile group in each micropile assembly unit are connected by pouring reinforced concrete on the surface based on the concrete connector to form a unit of reinforced concrete slab surface layer.
4. The trenchless micro pile group / bundled pile sheet wall support structure according to claim 3 is characterized in that: The upper micro pile group includes an upper grouting pipe with multiple unit modules constructed on the same horizontal line along the slope protection body, an upper support body is constructed along the inner wall of the upper grouting pipe, sand and gravel concrete slurry is poured into the bottom of each upper grouting pipe and compacted to construct a first base, an upper steel cage is lowered along the inner side of the upper support body to the first base, and sand and gravel concrete is poured along the inner and outer sides of the upper steel cage to form an upper micro pile unit module.
5. The trenchless micro pile group / bundled pile sheet wall support structure according to claim 3 is characterized in that: The medium and micro-sized spiral pile group includes a medium spiral grouting pipe with multiple unit modules constructed on the same horizontal line along the slope protection body, a flexible support body is constructed along the inner wall of the medium spiral grouting pipe, sand and gravel concrete slurry is poured into the bottom of each medium spiral grouting pipe and compacted to construct a second base, a medium steel cage is lowered along the inner side of the flexible support body to the second base, and sand and gravel concrete is poured along the inner and outer sides of the medium spiral grouting pipe to form a medium spiral pile unit module.
6. The trenchless micro pile group / bundled pile sheet wall support structure according to claim 3 is characterized in that: The lower micro pile group includes a lower grouting pipe with multiple unit modules constructed on the same horizontal line along the slope protection body, a lower support body is constructed along the inner wall of the lower grouting pipe, sand and gravel concrete slurry is poured into the bottom of each lower grouting pipe and compacted to construct a third base, a steel cage is lowered along the inner side of the lower support body to the third base, and sand and gravel concrete is poured along the inner and outer sides of the lower steel cage to form a lower micro pile unit module.
7. The trenchless micro pile group / bundled pile sheet wall support structure according to claim 4 is characterized in that: The upper support body includes an upper ring-type support member fixed along the inner wall of an upper grouting pipe, the upper ring-type support members are fixed by a plurality of upper anchor rods, an upper steel cage is placed inside the upper ring-type support member, sand and gravel concrete is poured along the inner and outer sides of the upper steel cage to form an upper micro pile unit module, an upper locking device is arranged at the top of each upper anchor rod, an upper inclined hole is arranged on the upper locking device, and an upper inclined anchor rod supporting the upper anchor rod is arranged along the upper inclined hole, the upper inclined anchor rod passes through the upper grouting pipe and is fixed inside the slope protection body, and the upper inclined anchor rod and the upper anchor rod form a "human" shaped support structure.
8. The trenchless micro pile group / bundled pile sheet wall support structure according to claim 5 is characterized in that: The flexible support body includes a fiber grid fixed along the inner wall of the middle spiral grouting pipe, a middle steel cage is lowered inside the fiber grid to the second base, and sand and gravel concrete is poured along the inside and outside of the middle spiral grouting pipe to form a middle spiral pile unit module.
9. The trenchless micro pile group / bundled pile sheet wall support structure according to claim 8, characterized in that: The fiber mesh is one of carbon fiber or glass fiber.
10. The trenchless micro pile group / bundled pile sheet wall support structure according to claim 6, characterized in that: The lower support body includes a lower ring-type support member fixed along the inner wall of the upper grouting pipe, and the lower ring-type support members are fixed by multiple lower anchor rods. A steel cage is lowered inside the lower ring-type support member, and sand and gravel concrete is poured along the inner and outer sides of the lower steel cage to form a lower micropile unit module. A lower lock is arranged at the top of each lower anchor rod, and a lower inclined hole is arranged on the lower lock, and a lower inclined anchor rod supporting the lower anchor rod is arranged along the lower inclined hole, and the lower inclined anchor rod passes through the lower grouting pipe and is fixed inside the slope protection body, and the lower inclined anchor rod and the lower anchor rod form a "human" shaped support structure.