A flow-type solidified soil based work method pile positioning device and foundation pit supporting method

Abstract

The application discloses a kind of based on flow state solidified soil's method pile pile positioning device and foundation pit supporting method, including cross rail, sleeper and ground stake, the both ends of cross rail are fixed and built on bottom plate, and a plurality of bite pile holes for being used to pass through profile steel are equipped on bottom plate, and bottom plate is laid on the top of sleeper;The ground stake of the bottom surface of sleeper is set perpendicular to ground;Cross rail top is uniformly provided with a plurality of positioning slots, and positioning mechanism can be detachably connected on positioning slot;Positioning mechanism is used for the positioning installation of cooperation profile steel;The present application can ensure the laying position accuracy of each profile steel pile after grouting by adding positioning mechanism, without measuring and laying out one by one calibration, and the positioning guide structure of the present application is provided for laying point, and the pile position can be accurately corresponded with calibration position;Meanwhile, the positioning mechanism in the present application can move on cross rail, and the spacing can be adjusted by adjusting mechanism, and then the pile positioning of profile steel is more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of flow state solidified soil based method pile pile positioning device and foundation pit supporting method, belong to the deep foundation pit supporting technical field of construction in flow state solidified soil construction. BACKGROUND

[0002] Foundation pit supporting, to ensure the safety of underground structure construction and the environment around foundation pit, the support, reinforcement and protection measures used to the side wall and surrounding environment of foundation pit. The existing foundation pit supporting mostly uses support plate support, underground continuous wall support, cement retaining wall support and other support methods; premixed flow state solidified soil is a mixture of various discarded spoil, soil hardening agent and water mixed in a certain ratio and reaches a certain performance index, with a slump of 80mm-220mm and a unconfined compressive strength of 0.4-15MPa; it is a green innovative material, which can replace traditional concrete, clay foundation and gravel concrete in some fields, with significant social significance of energy saving and emission reduction, industrial solid waste comprehensive utilization; the technology can be applied to solidified soil composite foundation, backfill (replacement) foundation, stiff composite pile and foundation pit support pile engineering, or pipe gallery and subway foundation pit trench backfill, civil building foundation pit trench backfill, roadbed foundation treatment and construction road surface road material and foundation cushion material field, with the advantages of saving building materials and saving investment cost.

[0003] The patent with application number CN200810035278.7 discloses a foundation pit group pit in-pit mixing pile sleeve drilling pile supporting method, which comprises selecting suitable solidifying agent mortar to make mixing piles and cast-in-place piles on natural ground, and the construction interval of mixing piles lapping adjacent piles is not more than 6-12 hours; the depth and reinforcement of drilling pile are set according to the requirements of pit-in-pit; round steel suspension method is used to lower the reinforcement cage in the upper part of foundation pit excavation, and the cast-in-place pile is required to be constructed within 3-7 days after the completion of mixing pile construction; temporary steel support is set during the excavation process of excavator; the top of cast-in-place pile is provided with a reinforced concrete cap beam to form a whole; brick wall or mortar is lined on the outside of mixing pile to form a structure outer mold. The present application implements the variable parameter technology of the same mixing pile, realizes the support of pit-in-pit on natural ground, sets the depth of drilling pile and mixing pile according to the excavation elevation of foundation pit group pit-in-pit, effectively controls the deformation and water stop of deep foundation pit group pit-in-pit, and ensures the safety of earthwork excavation and structure construction of large-area deep foundation pit group.

[0004] At present, due to the acceleration of urbanization process, the demand for underground structures is increasing, and SMW method pile foundation pit supporting is widely used; compared with cast-in-place pile supporting, it has good economy, but it also has the following shortcomings: it cannot be constructed when encountering hard soil layer or hard impurity soil layer containing egg gravel and broken stone; a large amount of slurry is returned during construction, and the environmental protection and economy are poor; at the same time, since the pre-positioning of profile steel is carried out when the flow state solidified soil is in a liquid state, it is easy to occur inaccurate positioning. SUMMARY

[0005] In order to solve the above problems existing in the prior art, the application provides a method for supporting a foundation pit by using a construction pile and a pile positioning device.

[0006] The technical scheme of the application is as follows:

[0007] A pile positioning device for a construction pile based on a fluidized solidified soil, comprising a cross rail, a sleeper and a ground pile, the two ends of the cross rail are fixedly built on a bottom plate, a plurality of pile holes for embedding a profile steel are arranged on the bottom plate, and the bottom plate is arranged on the top of the sleeper; the bottom surface of the sleeper is provided with the ground pile which is perpendicular to the ground; a plurality of positioning grooves are uniformly arranged on the top of the cross rail, and a positioning mechanism is detachably connected to the positioning grooves; and the positioning mechanism is used for positioning and installing the profile steel.

[0008] Preferably, the positioning mechanism comprises a main frame, a profile steel positioning plate, a profile steel positioning groove and an adjusting assembly, the main frame is provided with two groups in the same direction, and the two groups of main frames are connected through the adjusting assembly which is installed on the side; the profile steel positioning plate is symmetrically arranged in the main frame, the two profile steel positioning plates are reversibly connected to the main frame at an angle of 90 degrees, and the profile steel positioning groove is formed when the two profile steel positioning plates are abutted against each other; and the adjusting assembly is rotatably connected to the main frame through a pin shaft.

[0009] Preferably, the main frame and the profile steel positioning plate are connected through a hinge.

[0010] Preferably, the number of adjusting assemblies corresponds to the number of main frames.

[0011] Preferably, the adjusting assembly comprises an internal thread connecting rod, a double-headed screw rod and a U-shaped frame, one group of internal thread connecting rods is arranged, and the two internal thread connecting rods are threadedly connected through the double-headed screw rod; the U-shaped frame is fixed to the bottom of the internal thread connecting rod, and the open end is vertically downward.

[0012] Preferably, a positioning column is detachably installed on the U-shaped frame, and the positioning column and the positioning groove are used in cooperation.

[0013] Preferably, a positioning nut is installed at the joint of the double-headed screw rod and the internal thread connecting rod.

[0014] Preferably, the number of U-shaped frames is twice the number of adjusting assemblies.

[0015] Preferably, the thread directions of the two ends of the screw rod are opposite.

[0016] Preferably, a method for supporting a foundation pit by using a construction pile based on a fluidized solidified soil comprises the following steps:

[0017] S1: measurement and line laying: an axis is laid out by using a total station, a pile position is determined, and a reinforcing bar is placed at the pile position;

[0018] S2: Equipment in place: The equipment is moved to the designated pile position and leveled to ensure that the verticality of the equipment meets the requirements;

[0019] S3: The equipment should be re-measured and positioned when it is in place, and mud wall protection is used during the hole forming process. Natural mud is formed by the stirring action of the drill bit on the soil during drilling. The specific gravity of the mud can be adjusted according to actual needs, and the specific gravity of the mud is generally controlled between 1.2 and 1.3 during construction;

[0020] S4: Jet grouting pile: After the pile machine forms a hole to the specified depth, pre-mixed fluidified soil is sprayed into the drill rod hole from the equipment, and the fluidified soil has a strength of 2-10 MPa according to the requirements;

[0021] S5: Inserting reinforcement: Inserting steel pile reinforcement before the pile body initial setting, after the reinforcement is inserted, using the positioning mechanism for repositioning, the steel is positioned by engaging the pile hole, the positioning mechanism is installed on the cross rail through the adjusting assembly U-shaped frame and positioning column, the two groups of main frames in the positioning mechanism are connected through the adjusting assembly, and the rotation installation of the pin shaft can make the two groups of main frames rotate alternately to position the steel, the adjusting assembly can adjust and control the distance between the main frames, thereby controlling and adjusting the distance between the steel and the steel, and ensuring the pile position and verticality, if necessary, a guide groove can also be used;

[0022] S6: Construction of adjacent piles: If the designed pile body needs to be engaged, it needs to be formed by jumping piles, and after the initial setting, the two piles are engaged into a pile;

[0023] S7: Cleaning of the machine: After the pile body construction is completed, the residual pre-mixed fluidified soil in the entire pipeline is cleaned, and the soil of the pile machine is also cleaned.

[0024] The present application has the following advantages: the positioning mechanism can ensure the layout position accuracy of each steel pile after grouting, without the need for measuring and marking one by one, and the measuring and marking of the layout point has the positioning guide structure of the device, so that the pile position can accurately correspond to the marked position; at the same time, the positioning mechanism in the present application can move on the cross rail, and the spacing can also be adjusted through the adjusting mechanism, thereby facilitating the pile positioning of the steel. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The overall structure of the present application is shown in the structure diagram;

[0026] Figure 2 The local enlarged view of A in the present application is shown in the structure diagram; Figure 1

[0027] Figure 3 The structure diagram of the positioning mechanism of the present application is shown in the structure diagram;

[0028] ​Figure 4 Structure diagram of adjusting assembly of the present application;

[0029] Figure 5 Structure diagram of adjusting assembly of the present application; Figure 4 Local enlarged view of B in the present application;

[0030] Figure 6 Working step diagram of positioning mechanism of the present application when positioning the position of the profiled steel.

[0031] The reference signs in the drawings represent:

[0032] 1, cross rail; 2, sleeper; 3, ground pile; 4, profiled steel; 5, positioning groove; 6, positioning mechanism; 601, main body frame; 602, profiled steel positioning plate; 603, profiled steel positioning groove; 604, adjusting assembly; 6041, inner threaded hole connecting rod; 6042, pin shaft; 6043, positioning nut; 6044, double-headed screw rod; 6045, positioning column; 6046, U-shaped frame; 605, hinge; 7, engagement pile hole; 8, bottom plate. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0034] Referring to Figures 1 to 2 A flow state solidified soil-based work method pile positioning device, comprising a cross rail 1, a sleeper 2 and a ground pile 3, the two ends of the cross rail 1 are fixedly built on a bottom plate 8, the bottom plate 8 is provided with a plurality of engagement pile holes 7 for passing profiled steels 4, and the bottom plate 8 is laid on the top of the sleeper 2; the bottom surface of the sleeper 2 is provided with the ground pile 3 perpendicular to the ground; the top of the cross rail 1 is uniformly provided with a plurality of positioning grooves 5, and the positioning mechanism 6 is detachably connected to the positioning groove 5; the positioning mechanism 6 is used for positioning and installing the profiled steel 4; through the positioning mechanism 6 which can walk on the cross rail 1, the interactive positioning of a plurality of profiled steels 4 is more convenient to complete.

[0035] Referring to Figures 3 to 5The positioning mechanism 6 comprises a main frame 601, a profile steel positioning plate 602, a profile steel positioning groove 603 and an adjusting assembly 604. The main frame 601 is provided with two groups of the main frame 601 in the same direction, and the two groups of the main frame 601 are connected through the side-mounted adjusting assembly 604. The profile steel positioning plate 602 is symmetrically arranged in the main frame 601, and the profile steel positioning plate 602 is rotatably connected with the main frame 601 at an angle of 90°, and the two profile steel positioning plates 602 form the profile steel positioning groove 603 when they are abutted with each other. The adjusting assembly 604 is rotatably connected with the main frame 601 through a pin shaft 6042. The profile steel positioning plate 602 which is rotatable at an angle of 90° with the main frame 601 is used to fix the profile steel 4 and prevent the profile steel 4 from deviating from the position. When the profile steel 4 is fixed, the profile steel positioning groove 603 is formed when the two profile steel positioning plates 602 are abutted with each other in a horizontal state, so as to stabilize the position of the profile steel 4.

[0036] Further, the main frame 601 is connected with the profile steel positioning plate 602 through a hinge 605, so as to achieve the purpose of being rotatable at an angle of 90°.

[0037] Further, the number of the adjusting assembly 604 corresponds to the number of the main frame 601, and the adjusting assembly 604 is fixed on the two sides of the main frame 601, which is more conducive to synchronous adjustment.

[0038] Further, the adjusting assembly 604 comprises an internal thread connecting rod 6041, a double-headed screw rod 6044 and a U-shaped frame 6046. The internal thread connecting rod 6041 is provided with one group, and the two internal thread connecting rods 6041 are threadedly connected through the double-headed screw rod 6044, and the threads at the two ends of the double-headed screw rod 6044 are opposite in direction. The U-shaped frame 6046 is fixed at the bottom of the internal thread connecting rod 6041, and the open end is vertically downward. A positioning column 6045 is detachably mounted on the U-shaped frame 6046. After the double-headed screw rod 6044 is adjusted to determine the required pile position distance, the positioning column 6045 is used in cooperation with the positioning groove 5, and after being fixed, the pile can be driven. The number of the U-shaped frame 6046 is twice the number of the adjusting assembly 604, so that the positioning mechanism 6 can move in a row on the cross rail 1.

[0039] Further, the double-headed screw rod 6044 is provided with a positioning nut 6043 at the interface with the internal thread connecting rod 6041, which is used for fixing the position length when the distance is adjusted.

[0040] A method for supporting a foundation pit by a construction pile based on a fluidized solidified soil, which comprises the following steps:

[0041] S1: measurement and line laying: an axis is laid out by a total station instrument, a pile position is determined, and a reinforcing bar is placed at the pile position;

[0042] S2: equipment positioning: the equipment is moved to a specified pile position, leveled and adjusted, and the verticality of the equipment is ensured to meet the requirements;

[0043] S3: The device should be re-measured, positioned when in place, and mud walling should be used during the hole-forming process. Natural mud is created by the mixing action of the drill bit on the soil during drilling. The specific gravity of the mud can be adjusted according to actual needs, and the specific gravity of the mud is generally controlled between 1.2 and 1.3 during construction;

[0044] S4: Jetting pile: After the pile machine forms a hole to the specified depth, pre-mixed fluidified soil is sprayed into the device drill rod hole, and the fluidified soil has a strength of 2-10 MPa according to the requirements;

[0045] S5: Inserting reinforcement: Inserting reinforcement such as steel pile before the pile body initial setting. After the reinforcement is inserted, the positioning mechanism is used for repositioning. The steel is positioned by engaging the pile hole. The positioning mechanism is installed on the cross rail through the U-shaped frame and the positioning column in the adjusting assembly. The two groups of main frames in the positioning mechanism are connected through the adjusting assembly, and the rotation installation of the pin shaft can make the two groups of main frames rotate alternately to position the steel. The adjusting assembly can adjust and control the distance between the main frames, thereby controlling and adjusting the distance between the steel and the steel, and ensuring the pile position and perpendicularity. If necessary, a guide groove can also be used;

[0046] S6: Construction of adjacent piles: If the designed pile body needs to engage, it needs to jump pile and form pile, and after the initial setting, it needs to engage into a pile between the two piles;

[0047] S7: Machine cleaning: After the pile body construction is completed, the residual pre-mixed fluidified soil in the entire pipeline is cleaned, and the soil of the pile machine is also cleaned.

[0048] The working principle of the present application is:

[0049] In the present application, first, the axis is released by the total station, the pile position is determined, and the reinforcement is placed at the pile position; then the equipment is moved to the specified pile position, and leveling treatment is carried out to ensure that the verticality of the equipment meets the requirements; secondly, the equipment should be re-measured and positioned when it is in place, mud wall is used in the hole forming process, natural mud is formed by the stirring action of the drill bit on the soil during drilling, and the specific gravity of the mud can be adjusted according to actual needs, the specific gravity of the mud is generally controlled between 1.2 and 1.3 during construction, the pre-mixed flow state solidified soil pile can be applied in hard and miscellaneous soil layers with pebbles, gravel, miscellaneous fill and the like, and has higher strength, better construction effect and permeability resistance compared with the same, and can digest part of the soil residue transported outside, and has good economy and environmental protection compared with the same; then, after the pile machine forms a hole to the specified depth, pre-mixed flow state solidified soil is sprayed into the drill rod hole from the equipment, and the solidified soil has a strength of 2-10Mpa according to the requirements, compared with the same, the cost of the pre-mixed flow state solidified soil is much lower than that of the concrete pile, which can create good economic benefits; the construction is more convenient, the construction period can be shortened, and good time efficiency is obtained; next, the steel bar 4 is inserted before the pile body initial setting, after the steel bar 4 is inserted, the positioning mechanism 6 is used for repositioning, the steel bar 4 is positioned by engaging the pile hole 7, the positioning mechanism 6 is detachably installed on the cross rail 1 through the U-shaped frame 6046 and the positioning column 6045 in the adjusting assembly 604, the two groups of same direction main frames 601 in the positioning mechanism 6 are connected through the adjusting assembly 604, and the rotation installation of the pin shaft 6042 can make the two groups of main frames 601 rotate alternately to position the position of the steel bar 4, the adjusting assembly 604 can adjust and control the distance between the main frames 601, so as to control and adjust the distance between the steel bars 4, and ensure the pile position and verticality, and if necessary, a guide groove can also be used, see Figure 6 The working flow chart of the positioning mechanism 6 is shown in the figure, the steel bars 4 can be repeatedly and repeatedly positioned by rotating alternately; if the designed pile body needs to be engaged, the pile needs to be jumped and formed, and the two piles are engaged after initial setting; after the pile body construction is completed, the residual pre-mixed flow state solidified soil in the whole pipeline is cleaned, and the soil of the pile machine is cleaned.

[0050] The above is only an embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent flow conversion obtained by using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A pile positioning device based on fluidized solidified soil, characterized in that: The utility model relates to a type steel positioning device for pile machine, including cross rail (1), sleeper (2) and ground stake (3), the both ends of cross rail (1) are fixed and build on bottom plate (8), and bottom plate (8) is equipped with a plurality of occlusal pile hole (7) for the type steel (4) of wearing and is set, and bottom plate (8) is laid on the top of sleeper (2), the bottom surface of sleeper (2) is provided with ground stake (3) perpendicular to ground, the top of cross rail (1) is evenly provided with a plurality of positioning slot (5), and positioning mechanism (6) is detachably connected on positioning slot (5), and positioning mechanism (6) is used for the positioning installation of cooperation type steel (4), positioning mechanism (6) includes main frame (601), type steel positioning plate (602), type steel positioning slot (603) and adjusting assembly (604), the same direction of main frame (601) is provided with two groups, and the two groups of main frame (601) are connected through the adjusting assembly (604) of side installation between two, the symmetry of main frame (601) is provided with type steel positioning plate (602), and the mutual splicing cooperation of two type steel positioning plates (602) forms type steel positioning slot (603) when being 90 ° overturning connection between two type steel positioning plates (602) and main frame (601), adjusting assembly (604) is rotatably connected between main frame (601) through pin shaft (6042), adjusting assembly (604) includes inner thread link (6041), stud bolt (6044) and U-shaped frame (6046), one set of inner thread link (6041) is equipped with, and two inner thread links (6041) are threadedly connected through stud bolt (6044) between two, U-shaped frame (6046) is fixed at the bottom of main frame (601), and the open end is vertically downward, positioning column (6045) is detachably installed on U-shaped frame (6046), and positioning column (6045) is used in cooperation with positioning slot (5), main frame (601) is connected through hinge (605) between type steel positioning plate (602).

2. A flowable soil based underpinning pile positioning device according to claim 1 wherein: The number of adjusting assemblies (604) corresponds to the number of main frames (601).

3. A flow-improved soil-based underpinning device according to claim 1, wherein: A positioning nut (6043) is installed at the interface between the stud bolt (6044) and the inner thread link (6041).

4. A flow-improved soil-based underpinning device according to claim 1, wherein: The number of U-shaped frames (6046) is twice the number of adjusting assemblies (604).

5. A flow-improving device for a flow-improving method according to any one of claims 1 to 4, wherein the flow-improving device is a flow-improving device according to claim 3, characterized in that: The thread directions of the two ends of the stud bolt (6044) are opposite.

6. A method of supporting an excavation using the flow-based soil-cement pile positioning apparatus of claim 5, wherein, The method comprises the following steps: S1: measuring and laying out a line: determine the pile position by laying out an axis with a total station instrument, and place a reinforcing bar at the pile position; S2: positioning the equipment: move the equipment to the specified pile position and level it to ensure that the verticality of the equipment meets the requirements; S3: re-measure and position when the equipment is positioned, use mud wall protection during hole forming, naturally create mud by using the stirring action of the drill bit on the soil during drilling, and adjust the specific gravity of the mud according to actual needs, and the specific gravity of the mud is generally controlled between 1.2 and 1.3 during construction; S4: spray-pile forming: after the pile machine forms a hole to the specified depth, spray pre-mixed fluidized solidified soil into the drill rod hole of the equipment, and the solidified soil has a strength of 2-10 MPa according to requirements; S5: Inserting the reinforcement: Inserting the steel (4) reinforcement before the initial setting of the pile body, after the insertion of the reinforcement, repositioning is carried out using the positioning mechanism (6), the steel (4) is positioned by engaging the pile hole (7) of the pile, the positioning mechanism (6) is integrally detachably installed on the cross rail (1) through the U-shaped frame (6046) and the positioning column (6045) in the adjusting assembly (604), the two groups of same direction main frames (601) in the positioning mechanism (6) are connected through the adjusting assembly (604), and the rotation installation of the pin shaft (6042) makes the two groups of main frames (601) rotate and alternately position the steel (4), the adjusting assembly (604) adjusts and controls the distance between the main frames (601), thereby controlling and adjusting the pile distance between the steel (4) and the steel (4), and ensuring the pile position and the perpendicularity; S6: Construction of adjacent piles: If the designed pile body needs to be engaged, the pile needs to be jumped and formed into a pile, and after the initial setting, the two piles are engaged into a pile in the middle; S7: Cleaning of the machine: After the completion of the pile body construction, the residual premixed fluidified solidified soil in all pipelines is cleaned, and the soil of the pile machine is cleaned.

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