CN114086607B - Anchor rod for increasing anti-buoyancy in soft soil - Google Patents

Anchor rod for increasing anti-buoyancy in soft soil Download PDF

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Publication number
CN114086607B
CN114086607B CN202111292183.5A CN202111292183A CN114086607B CN 114086607 B CN114086607 B CN 114086607B CN 202111292183 A CN202111292183 A CN 202111292183A CN 114086607 B CN114086607 B CN 114086607B
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rod
sectional
outer tube
soft soil
anchor
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CN114086607A (en
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金炜枫
付周敏
解军吉
陶颖
曹宇春
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Zhejiang Lover Health Science and Technology Development Co Ltd
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Zhejiang Lover Health Science and Technology Development Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
    • E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00—Handling building or like materials for hydraulic engineering or foundations
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/74—Means for anchoring structural elements or bulkheads
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
    • G06F17/10—Complex mathematical operations
    • G06F17/16—Matrix or vector computation, e.g. matrix-matrix or matrix-vector multiplication, matrix factorization
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

Abstract

The invention discloses an anchor rod for increasing anti-buoyancy in soft soil, which comprises an outer tube, an inner tube, a chassis, a first guide rod, a sectional rod forming device and a driving device, wherein the outer tube is arranged on the chassis; the inner tube and the outer tube are concentric, the inner tube is rotatably arranged in the outer tube, and the chassis is fixedly arranged in the inner tube; the sectional rod forming device comprises a die box arranged on the chassis, a pressure pump for conveying curing liquid to the die box and a liquid storage box for storing the curing liquid, wherein the pilot rod is matched with the die box, and the curing liquid conveyed into the die box is cured to form a sectional rod which is fixedly connected with the pilot rod, and the width of the sectional rod is the same as that of the pilot rod; the driving device comprises two gears and a gear driving mechanism, the gears are rotatably arranged on the chassis, the gear driving mechanism is connected with the gears to drive the gears to rotate, the rotating gears drive the pilot rod or the sectional rod to move out of the outer tube, and the pilot rod and the sectional rod which are matched to move on the outer tube and the inner tube are correspondingly provided with guide holes. The invention can enhance the anti-floating performance of the anti-floating anchor rod of the underground structure in soft soil.

Description

Anchor rod for increasing anti-buoyancy in soft soil
Technical Field
The invention belongs to the field of geotechnical engineering research, and particularly relates to an anchor rod for increasing anti-buoyancy in soft soil.
Background
When the basement bears the excessive pressure of underground water, anti-floating piles or anti-floating anchor rods are needed, or the basement ground is depressurized and drained, and the anti-floating anchor rods are used in soft soil, so that the problem that the bonding between an anchor rod grouting body and a soft soil interface is weak exists, and the anti-floating performance of the anchor rods in the soft soil needs to be enhanced.
Disclosure of Invention
The invention provides an anchor rod for increasing the anti-floating force in soft soil, which aims to enhance the anti-floating performance of an anti-floating anchor rod of an underground structure in soft soil.
The technical scheme of the invention is as follows: an anchor rod for increasing the anti-buoyancy in soft soil comprises an outer tube, an inner tube, a chassis, a first guide rod, a sectional rod forming device and a driving device; the inner tube and the outer tube are concentric, the inner tube is rotatably arranged in the outer tube, and the chassis is fixedly arranged in the inner tube; the sectional rod forming device comprises a die box arranged on the chassis, a pressure pump for conveying curing liquid to the die box and a liquid storage box for storing the curing liquid, wherein the pilot rod is matched with the die box, and the curing liquid conveyed into the die box is cured to form a sectional rod which is fixedly connected with the pilot rod, and the width of the sectional rod is the same as that of the pilot rod; the driving device comprises two gears and a gear driving mechanism, the gears are rotatably arranged on the chassis, the gear driving mechanism is connected with the gears to drive the gears to rotate, the rotating gears drive the pilot rod or the sectional rod to move out of the outer tube, and the pilot rod and the sectional rod which are matched to move on the outer tube and the inner tube are correspondingly provided with guide holes.
Preferably, the anti-floating method of the anchor rod comprises the following steps:
step 1: when the installation is started, the gear is connected with the pilot rod;
step 2: setting N sectional rods in a mould box, wherein the numbers of the sectional rods generated according to the time sequence are 1,2, … and N;
step 3: injecting the curing liquid in the liquid storage tank into the mold tank by a pressure pump, and then converting the curing liquid in the mold tank into a cured sectional rod, wherein the number of the sectional rod is 1, and the sectional rod is fixedly connected with the pilot rod;
step 4: then the gear drives the first guide rod to enter soft soil from the guiding-out hole, and the first guide rod pulls the solidified segment rod No. 1 and vacates the space in the mould box;
step 5: injecting the curing liquid in the liquid storage tank into the mold tank by a pressure pump, converting the curing liquid in the mold tank into a cured sectional rod, wherein the number of the sectional rod in the mold tank is i, and the i-th sectional rod in the mold tank is fixedly connected with the previous i-1-th sectional rod;
step 6: then the i-1 th sectional rod in gear driving contact enters soft soil from the guiding-out hole, and the i-1 th sectional rod pulls the i-th sectional rod in the mould box and vacates the space in the mould box;
step 7: repeating the steps 5-6 until the appointed number of segmented rods are driven into the soft soil.
Preferably, the method for driving the first guide rod or the segmented rod to move by the gear comprises the following steps: two gears are respectively arranged at two sides of the first guide rod, and the first guide rod or the sectional rod is extruded while the two gears rotate so as to drive the first guide rod or the sectional rod to move; or racks are respectively arranged on the two sides of the pilot rod, the gears are meshed with the racks, a rack mounting device for fixing the racks on the side of the sectional rod is arranged in the die box, and the racks are meshed with the racks to drive the pilot rod or the sectional rod to move when the gears rotate.
Preferably, the rack mounting device comprises a pushing mechanism, a rack, a storage chamber, a spring and a push plate; the number of the strip storage chambers is 2 and the strip storage chambers are symmetrically arranged, a rack array is arranged in any one strip storage chamber, a spring is matched with the rack array through a push plate to push racks to move to the outlet below the strip storage chamber, two pushing mechanisms are respectively arranged below each strip storage chamber, each pushing mechanism is used for pushing racks outside the strip storage chamber to move to the other pushing mechanism for a preset distance, and the two racks moving for the preset distance are matched with a mould box and a sectional rod or a pilot rod to form a curing tank for curing liquid to be contained.
Preferably, the tail end of each sectional rod is provided with a connecting hole, the tail end of the corresponding sectional rod in the mold box is provided with a connecting hole forming device, and the connecting hole forming device comprises a deformation body with one end fixedly connected with the mold box and a temperature control system for controlling the temperature of the deformation body; the end of the first guide rod, which is contacted with the No. 1 sectional rod, is provided with a hole, the entrance of the hole is small, and the interior of the first guide rod is enlarged.
Preferably, the deformation body is made of shape memory alloy, the connecting end of the deformation body and the mould box is set to be a first end, and the opposite end is set to be a second end; when the curing liquid is liquid in the mold box, the temperature control system controls the deformation body to be at a first temperature, and the first end of the deformation body is smaller than the second end at the first temperature; after the solidification liquid is converted into solid in the mold box, the temperature control system controls the deformation body to be at a second temperature, and the first end of the deformation body is larger than the second end at the second temperature.
Preferably, the anchor rod further comprises a first auxiliary reinforcing device, the first auxiliary reinforcing device comprises a pull rope and a tightening device, the tightening device is arranged on the outer tube, one end of the pull rope is arranged in the tightening device, the other end of the pull rope is arranged in the guiding-out hole and is fixedly connected with the pilot rod, and the pull rope is connected with the tightening device and the pilot rod through the outer side of the outer tube; the guide rod enters the soft soil layer through the guide hole, the tightening device enables the pull rope to freely stretch, and when the guide rod enters the soft soil layer to reach the designated length, the tightening device fixes the pull rope, and the pull rope cannot freely stretch.
Preferably, adjacent guide rods are connected by circumferential wires, the circumferential wires are arranged outside the outer tube, and the circumferential wires are connected with the outer side of the outer tube through flexible cloth or silk screen.
Preferably, the prior guide rod is provided with an inclinometer, and the inclinometer is arranged at one end of the prior guide rod far away from the outer tube; installing an inclinometer on the rack of the sectional rod, wherein the inclinometer is pressed into the sectional rod along with the rack; after the segmented rods are pressed into the soil for a specified number, the segmented rods contacted with the outer tube are arranged at the junction of the segmented rods and the outer tube by the inclinometer; the method for calculating the vertical acting force of the rod piece on the anchor rod is as follows:
(1) Step 1, a guide rod and a sectional rod which extend into soft soil from a guide hole form a whole rod piece, wherein the total length of the rod piece in the soft soil is L, m+1 inclinometers are arranged in total, and the rod piece with the total length of L is divided into m sections; the method comprises the steps that the number of the inclinometer at the junction of a sectional rod and an outer tube is 1, the number of the inclinometer furthest away from the outer tube is m+1, and the number of a node between the inclinometer 1 and the inclinometer m+1 is sequentially increased;
(2) Step 2, the nodes corresponding to the ith inclinometer and the (i+1) th inclinometer are respectively the ith node and the (i+1) th node, the ith section is arranged between the ith node and the (i+1) th node, and the length of the ith section is L (i) Young's modulus of E (i) Moment of inertia I (i) The number corresponding to the node of the ith section close to the outer tube is i 1 The number corresponding to the node of the ith section far away from the outer tube is i 2 The vertical displacement and the rotation angle corresponding to the node of the ith section close to the outer tube are respectively
Figure GDA0004211833650000041
And->
Figure GDA0004211833650000042
The vertical displacement and the rotation angle corresponding to the node of the ith section far away from the outer tube are respectively +.>
Figure GDA0004211833650000043
And->
Figure GDA0004211833650000044
Here, (1.ltoreq.i.ltoreq.m);
(3) Step 3, measuring the corresponding rotation angle theta of each node based on the inclinometer j The method comprises the steps of carrying out a first treatment on the surface of the Taking the vertical displacement v of the node when j=1 j =0, when j>1, the vertical displacement on the node j is taken as
Figure GDA0004211833650000051
Thus obtaining the displacement and the rotation angle of each node;
(4) Step 4, from the length L of the ith section (i) Young's modulus E (i) Moment of inertia I (i) Vertical displacement at two nodes
Figure GDA0004211833650000052
And->
Figure GDA0004211833650000053
Corner on two nodes->
Figure GDA0004211833650000054
And->
Figure GDA0004211833650000055
Thereby calculating the node force ++on the two nodes on the i-th segment>
Figure GDA0004211833650000056
And->
Figure GDA0004211833650000057
Calculate the firstBending moment on two nodes on section i +.>
Figure GDA0004211833650000058
And->
Figure GDA0004211833650000059
The calculation method comprises the following steps:
Figure GDA00042118336500000510
Figure GDA00042118336500000511
(5) Step 5, a guide rod and a segment rod which extend into soft soil from a guide hole form a whole rod piece, and the vertical force of the rod piece on the anchor rod is calculated
Figure GDA00042118336500000512
Calculating the bending moment of the rod piece to the anchor rod>
Figure GDA00042118336500000513
Based on the vertical force F of the rod piece on the outer tube, the vertical force shared by the rod piece and the outer tube can be obtained through calculation and analysis, the soil friction force born by the outer tube can be determined by a conventional method, for example, axial strain is measured on the outer tube section so as to calculate the friction resistance of lateral soil; in addition, the vertical force F and the bending moment M at the junction of the sectional rod and the outer pipe can check whether the stress of the sectional rod exceeds the strength of the sectional rod.
The invention has the beneficial effects that the anti-floating performance of the anti-floating anchor rod of the underground structure in the soft soil is enhanced, namely, the injection molded segmented rods are sequentially connected as the reinforcing rods to enter the soft soil, so that the anti-floating force of the anchor rod is increased, the injection molded segmented rods can effectively increase the length of the part of the reinforcing rods which enters the soil, and the invention provides the anchor rod for increasing the anti-floating force in the soft soil.
Drawings
FIG. 1 is a schematic view of a driven anchor of the present invention; fig. 1 (a) is a schematic view of the overall structure of the anchor rod according to the present invention, and fig. 1 (b) is a schematic view of the anchor rod according to the present invention driven into soft soil.
FIG. 2 is a schematic top view of a segmented rod forming and moving according to the present invention; fig. 2 (a) is a schematic diagram of the matching relationship between the pilot lever and the gear, fig. 2 (b) is a schematic diagram of the formation of the segment lever, fig. 2 (c) is a schematic diagram of the movement of the segment lever, and fig. 2 (d) is a schematic diagram of the formation of a further segment lever.
Fig. 3 is a schematic top view of the driving device of the present invention.
FIG. 4 is a schematic vertical section of the rack mounting device of the present invention; fig. 4 (a) is a schematic view of an initial state of the rack mount, fig. 4 (b) is a schematic view of a state of the rack mount under the action of the pusher, and fig. 4 (c) is a schematic view of a state of the rack mount at the time of pusher reset.
FIG. 5 is a schematic representation of a variation of the present invention; fig. 5 (a) is a schematic view of the state of the deformation body at the second temperature, and fig. 5 (b) is a schematic view of the state of the deformation body at the first temperature.
Fig. 6 is a schematic view of the elbow adding device of the present invention.
FIG. 7 is a schematic view of a reinforcement line of the elbow adding device of the present invention.
FIG. 8 is a schematic view of a first auxiliary enhancement device of the present invention; fig. 8 (a) is a schematic view of an initial state of the first auxiliary reinforcing apparatus, and fig. 8 (b) is a schematic view of a state after the first auxiliary reinforcing apparatus is activated.
Fig. 9 is a schematic view of the circumferential line of the present invention.
Fig. 10 is a schematic view of a first sleeve and a second sleeve of the present invention.
In the drawings, 1, soft soil, 2, anchor rod, 3, outer tube, 4, inner tube, 5, export hole, 6, curing liquid, 7, storage tank, 8, pressure pump, 9, mold tank, 10, pilot arm, 11, segmented rod, 12, chassis, 13, gear, 14, gear drive mechanism, 15, pusher, 16, push rod, 17, rack, 18, storage tank, 19, spring, 20, push plate, 21, deformation body, 22, temperature control system, 23, elbow adding device, 24, panel, 25, elbow, 26, panel chamber, 27, panel pushing mechanism, 28, reinforcement line, 29, stay rope, 30, tightening device, 31, circumferential line, 32, flexible cloth, 33, first sleeve, 34, second sleeve.
Detailed Description
In order to make the technical means, innovative features, achieved objects and effects of the present invention easy to understand, the technical scheme of the present invention will be further described with reference to the specific drawings.
An anchor rod 2 for increasing the anti-buoyancy in soft soil 1 as shown in fig. 1-10 comprises an outer tube 3, an inner tube 4, a chassis 12, a pilot rod 10, a sectional rod forming device and a driving device; the inner pipe 4 and the outer pipe 3 are concentrically arranged, the inner pipe 4 is rotatably arranged in the outer pipe 3, the chassis 12 is fixedly arranged in the inner pipe, the sectional rod forming device comprises a die box 9 arranged on the chassis 12, a pressure pump 8 for conveying curing liquid to the die box 9 and a liquid storage box 7 for storing the curing liquid, the input end of the pressure pump 8 is communicated with the liquid storage box 7, the output end of the pressure pump 8 is communicated with the 4 die boxes 9 through a conduit, the curing liquid in the liquid storage box 7 can be uniformly conveyed into all the die boxes 9 through the pressure pump 8, the liquid storage box 7 and the pressure pump 8 are arranged on the ground outside soft soil, a guide rod 10 is matched with the die boxes 9 firstly, the curing liquid conveyed into the die boxes 9 is solidified to form a sectional rod 11 and is fixedly connected with a guide rod 10, and the width of the sectional rod 11 is the same as that of the guide rod 10; in the invention, one side of the die box 9 corresponding to the pilot rod 10 is an opening side, and the die box 9 and the pilot rod 10 are matched to form a curing groove for containing curing liquid. The driving device comprises gears 13 and a gear driving mechanism 14, wherein 2 gears 13 are rotatably arranged on the chassis 12, and the gears 13 are respectively arranged on two sides of the guide rod 10, but the gears 13 are not connected with the guide rod 10; the gear driving mechanism 14 is a motor, the number of the motors is 2, the motors are connected with the gears 13 through shafts to drive the gears 13 to rotate, and the two gears simultaneously rotate to drive the first guide rod 10 or the segmented rod 11 to move into the soil layer 1 outside the outer pipe, and the outer pipe 3 and the inner pipe 4 are internally provided with guiding holes, so that the first guide rod 10 and the segmented rod 11 connected with the first guide rod can move outside the outer pipe 3 through the guiding holes 5.
In the embodiment of the invention, the number of the sectional bar forming devices is 4 and the sectional bar forming devices are arranged at equal intervals along the circumferential direction, at least 4 first guide bars 10 are arranged, the 4 first guide bars are correspondingly matched with the 4 sectional bar forming devices, the sectional bar forming devices and the driving devices are arranged in a one-to-one correspondence, when the number of the first guide bars 10 is more than 4, for example, 8 first guide bars are arranged at equal intervals along the circumferential direction, the sectional bar forming devices can be rotated to the corresponding positions of the next first guide bars by rotating the inner tube 4, so that the sectional bars 11 are formed at the corresponding positions and connected with the corresponding guide bars 10, and then the sectional bars are moved outside the outer tube 3 under the action of the driving devices, and the number of the guide holes on the inner tube and the outer tube is 8. In the present invention, the number of the guide holes 5, the pilot rod 10, the segment rod forming device and the driving device can be set by a person skilled in the art according to the actual situation.
In the invention, a solidifying liquid 6 is injected into a mould box 9 by a pressure pump 8 to form a solid i-th sectional bar 11, wherein i=1, 2 and 3 …, the i-th sectional bar 11 is fixedly connected with the i-1-th sectional bar 11, and when i=1, the 1-th sectional bar 11 is fixedly connected with a pilot bar 10.
The anti-floating method for the anchor rod 2 for increasing the anti-floating force in the soft soil 1 comprises the following steps:
step 1: as shown in fig. 1 (a), the anchor rod 2 is driven into the soft soil 1, and as shown in fig. 2 (a), the two gears 13 are matched with the corresponding pilot rod 10 when the installation is started;
step 2: setting the die box 9 to manufacture N segmented rods 11, wherein the numbers of the segmented rods 11 generated according to the time sequence are 1,2, … and N;
step 3: as shown in fig. 2 (b), the solidifying liquid 6 in the liquid storage tank 7 is injected into the mold tank 9 by the pressure pump 8, then the solidifying liquid 6 in the mold tank 9 is converted into a solidified segment rod 11, and the segment rod 11 is numbered 1, the segment rod 11 of number 1 is fixedly connected with the pilot rod 10;
step 4: the gear 13 rotates under the action of the gear driving device, the rotating gear 13 drives the guide rod 10 to enter the soft soil 1 from the guiding-out hole 5, and the guide rod 10 pulls the solidified segment rod 11 No. 1 and vacates the space in the mould box 9 at the moment as shown in fig. 2 (c);
step 5: as shown in fig. 2 (d), the solidifying liquid 6 in the liquid storage tank 7 is injected into the mold tank 9 by the pressure pump 8, then the solidifying liquid 6 in the mold tank 9 is converted into a solidified segment rod 11, at this time, the segment rod 11 in the mold tank 9 is numbered as i, and the i-th segment rod 11 in this mold tank 9 and the previous i-1-th segment rod 11 are fixedly connected;
step 6: the gear 13 drives the i-1 th segmented rod 11 in contact to enter the soft soil 2 from the guiding-out hole 5, and at the moment, the i-1 th segmented rod 11 in the mould box 9 is pulled by the i-1 th segmented rod 11, and the space in the mould box 9 is vacated;
step 7: steps 5 to 6 are repeated until a prescribed number N of segment rods 11 are driven into the soft soil 1, as shown in fig. 1 (b).
Specifically, the manner in which the gear 13 drives the pilot rod 10 or the segment rod 11 to move may be the manner shown in fig. 2, the rack 17 is mounted on the side surface of the pilot rod 10, the rack mounting device is arranged in the mold box 9, the rack 17 is fixed on the side surface of the segment rod 11 by the rack mounting device, and the gear 13 is meshed with the rack 17 when rotating so as to drive the pilot rod 10 or the segment rod 11 to move. The rack mounting device comprises a pushing mechanism, a rack 17, a storage 18, a spring 19 and a push plate 20; the number of the strip storage chambers 18 is 2 and the strip storage chambers are symmetrically arranged, a rack array is arranged in any strip storage chamber 18, a spring 19 is matched with the rack array through a push plate 20 to push racks 17 to move to the outlet below the strip storage chamber 18, two pushing mechanisms are respectively arranged below each strip storage chamber 18, each pushing mechanism is used for pushing racks 17 outside the strip storage chamber 18 to move to the other pushing mechanism for a preset distance, and the two racks 17 moving for the preset distance are matched with a die box 9 and a sectional rod 10 or a pilot rod 11 to form a curing tank for containing curing liquid. Taking a mold box arranged at the front side as shown in fig. 4 (a), two storage tanks 18 are symmetrically arranged in the mold box 9 from side to side, the inner wall of each storage tank 18 is connected with a push plate 20 through a spring 19, the push plates 20 push a rack array, the rack array is a plurality of racks 17 which are transversely arranged in sequence, one side, far away from the spring 19, of the bottom of each storage tank 18 is provided with an outlet for accommodating the falling of one rack 17, the two racks 17, the mold box 9 and a guide rod or a sectional rod are matched to form a curing groove, when curing liquid 6 is gradually converted into a solid sectional rod 11 in the mold box 9, the strength of the solid sectional rod is in an ascending stage and does not reach a stable value, two driving mechanisms are arranged in the mold box 9 below each storage tank 18, each driving mechanism comprises a pusher 15 and a push rod 16, the mold box 9 is connected with the push rod 16 through the pusher 15, and the pusher 15 is used for pushing the racks to the other pusher 15 to drive the push rod 16 to move so that the push rod 16 is arranged at the outlet of the storage tank 18, and the rack 17 is prevented from falling under the action of the spring in the storage tank 18, and the sectional rod 11 is simultaneously pushed into the sectional rod 11 to shrink in the horizontal cross section under the action of the spring shown in fig. 4 (b); after the curing liquid is set in the curing tank, the curing liquid is cured to form a segmented rod, and when the pusher is reset, a new rack 17 as shown in fig. 4 (c) is dropped from the outlet of the storage 18 to contact with the push rod 16.
Of course, the manner in which the gear 13 drives the first guide rod 10 or the segment rod 11 may be: two gears 13 are respectively arranged on two sides of a route where the guide rod 10 and the sectional rod 11 pass through; the two gears 13 rotate while pressing the first guide rod 10 or the segment rod 11, thereby driving the first guide rod 10 or the segment rod 11 to move.
Further, as shown in fig. 5, each of the end portions of the segment rods 11 is provided with a connecting hole, and a connecting hole forming device is disposed in the mold box 9 corresponding to the end portion of the segment rod 11, and the connecting hole forming device includes a deformation body 21 with one end fixedly connected with the mold box 9, and a temperature control system for controlling the temperature of the deformation body 21. The deformation body 21 is made of shape memory alloy, the connecting end of the deformation body 21 and the mould box 9 is set to be a first end, and the opposite end is set to be a second end; when the curing liquid 6 is liquid in the mold box 9, as shown in fig. 5 (b), the temperature control system controls the deformation body to be at a first temperature, and the first end of the deformation body is smaller than the second end at the first temperature; after the solidification liquid 6 is converted into a solid in the mold box 9, the temperature control system controls the deformation body to be at a second temperature at which the first end of the deformation body is larger than the second end, as shown in fig. 5 (a). Here, the deformation body is to form a hole having a small inlet and a large interior in the solidification liquid, and the first end of the deformation body corresponds to the inlet of the connection hole when the solidification liquid is converted into a solid, and the second end of the deformation body corresponds to the interior of the connection hole when the solidification liquid is converted into a solid. After the curing liquid 6 is converted into solid in the mold box 9 to form an i-1 th sectional rod 11, the i-1 th sectional rod 11 is pulled out of the mold box 9 by the sectional rod 11 formed before, and at the moment, the tail part of the i-1 th sectional rod 9 forms a connecting hole with small surface and large inside; then when the solidifying liquid 6 is injected into the mould box 9 to prepare the ith segmented rod 11, the solidifying liquid 6 also flows into the connecting holes with small surface and large inside of the ith segmented rod 11, and after the ith segmented rod 11 is prepared, the connection between the ith segmented rod 11 and the ith segmented rod 11 is completed.
The contact surface of the first guide rod 10 and the No. 1 sectional rod 11 connected with the first guide rod is provided with a hole, the entrance of the hole is small and the interior of the first guide rod 10 is enlarged; when the segment rod 11 No. 1 is manufactured, the curing liquid 6 flows into the hole of the guide rod 10, and after the curing liquid 6 is converted into solid, the guide rod 10 is fixedly connected with the segment rod 11 No. 1.
In the invention, the temperature control system is a temperature control device, and the heating method of the temperature control device can be resistance wire heating, microwave heating or infrared heating. The specific structure of the temperature control device is common knowledge in the field, and a person skilled in the art can set the temperature control device according to the actual situation.
Still further, as shown in fig. 8 (a), the anchor rod 2 further includes a first auxiliary reinforcing device, the first auxiliary reinforcing device includes a pull rope 29 and a tightening device 30, the tightening device 30 is fixedly mounted on the outer tube 3, one end of the pull rope 29 is disposed in the tightening device, the other end of the pull rope is disposed in the guiding hole and fixedly connected with the pilot rod, and the pull rope 29 is connected with the tightening device 30 and the pilot rod 10 through the outer tube 3; as shown in fig. 8 (b), in the process that the guide rod 10 enters the soft soil 2 through the guiding-out hole 5, the tightening device 30 enables the pull rope 29 to freely extend; when the guide rod 10 enters the soft soil layer 1 to reach a specified length, the tightening device 30 fixes the pull rope 29, and the pull rope 29 cannot be freely stretched. For example, the tightening device 30 is a motor and a roller connected, and the pull cord 29 is wound on the roller and has one end fixedly connected with the roller; firstly, in the process that the guide rod 10 enters the soft soil 1 layer through the guide hole 5, the motor drives the roller to rotate, and the length of the pull rope 29 in the soft soil 1 layer is increased; when the guide rod 10 enters the soft soil 1 layer to reach a specified length, the roller is fixed, and the pull rope 29 cannot be freely stretched. The pull rope 29 provides pulling force at the end part of the leading guide rod 10 entering the soft soil 1 layer, so that the capability of the leading guide rod 10 and the subsequent connected segmented rods 11 for resisting soil pressure is increased in the anti-floating process, and the leading guide rod 10 or the segmented rods 11 are prevented from bending and breaking near the side surface of the outer tube 3.
As shown in fig. 9, adjacent guide rods 10 are connected by circumferential wires 31, the circumferential wires 31 pass through the outer side of the outer tube 3, and the circumferential wires 31 are connected with the outer side of the outer tube 3 by flexible cloth 32 or silk screen. Thus, after the guide rod 10 enters the soft soil 1 layer, the unfolded flexible cloth 32 or the silk screen increases the pulling resistance of the anchor rod 2 during floating resistance.
Preferably, one end of the pilot rod 10 is disposed in the guide hole of the outer tube 3 and extends to the outside of the outer tube 3, an expanding member is disposed between two adjacent pilot rods 10, two ends of the expanding member are fixedly connected with the ends of the two adjacent pilot rods 10 extending out of the outer tube respectively, the expanding member comprises a first sleeve 33 and a second sleeve 34, the first sleeve 33 is sleeved outside the second sleeve 34, the second sleeve 34 can slide in the first sleeve 33, and the length of the second sleeve is smaller than the sliding stroke of the second sleeve, so that the second sleeve cannot deviate from the first sleeve. The first sleeve 33 is connected to the outside of the outer tube 3 by a flexible cloth 32 or a wire mesh.
Further, by calculating the vertical force F and the bending moment M at the junction of the sectional bar 11 and the outer tube 3, whether the stress of the sectional bar 11 exceeds the strength of the sectional bar is checked, and the calculation method comprises the following steps:
the prior guide rod 10 is provided with an inclinometer, and the inclinometer is arranged at one end of the prior guide rod 10 far away from the outer tube 3; the inclinometer is arranged on the rack 17 of the sectional rod 11, and is pressed into the sectional rod 11 along with the rack 17; after the number of the sectional rods pressed into the soft soil 1 reaches a preset value, for the last sectional rod 11, the sectional rod 11 is contacted with the outer tube 3, and the inclinometer is arranged at the junction of the sectional rod 11 and the outer tube 3; the guide rod 10 and the segment rod 11 which extend into the soft soil 1 from one guide hole 5 form a whole rod piece, and the method for calculating the vertical acting force of the rod piece on the anchor rod 2 comprises the following steps:
(1) Step 1, a guide rod 10 and a segment rod 11 which extend into the soft soil 1 from a guide hole 5 form a whole rod piece, the total length of the rod piece in the soft soil 1 is L, the segment rod arranged in an outer tube is not included, m+1 inclinometers are arranged, and the rod piece with the total length L is divided into m sections; setting the number of the inclinometer at the junction of the sectional rod 11 and the outer tube 3 as 1, the number of the inclinometer furthest away from the outer tube 3 as m+1, and sequentially increasing the number of the nodes between the inclinometer 1 and the inclinometer m+1;
(2) Step 2, the nodes corresponding to the ith inclinometer and the (i+1) th inclinometer are respectively the ith node and the (i+1) th node, the ith section is arranged between the ith node and the (i+1) th node, and the ith section is arrangedLength of L (i) Young's modulus of E (i) Moment of inertia is I (i) The number corresponding to the node of the ith section close to the outer tube 3 is i 1 The number corresponding to the node of the ith section far away from the outer tube 3 is i 2 Let the vertical displacement and the rotation angle corresponding to the node of the ith section close to the outer tube 3 be respectively
Figure GDA0004211833650000141
And->
Figure GDA0004211833650000142
The vertical displacement and the rotation angle corresponding to the node of the ith section far away from the outer tube 3 are respectively +.>
Figure GDA0004211833650000143
And->
Figure GDA0004211833650000144
Here, (1.ltoreq.i.ltoreq.m);
(3) Step 3, measuring the corresponding rotation angle theta of each node based on the inclinometer j J represents the current node number, and when j=1, the node vertical displacement v is taken j =0, when j>1, the vertical displacement on the node j is taken as
Figure GDA0004211833650000145
Thus obtaining the displacement and the rotation angle of each node;
(4) Step 4, from the length L of the ith section (i) Young's modulus E (i) Moment of inertia I (i) Vertical displacement at two nodes
Figure GDA0004211833650000146
And->
Figure GDA0004211833650000147
Corner on two nodes->
Figure GDA0004211833650000148
And->
Figure GDA0004211833650000149
Calculating the node forces on two nodes on section i>
Figure GDA00042118336500001410
And->
Figure GDA00042118336500001411
And bending moment +.>
Figure GDA00042118336500001412
And->
Figure GDA00042118336500001413
The calculation method comprises the following steps:
Figure GDA00042118336500001414
Figure GDA00042118336500001415
(5) Step 5, calculating the vertical force of a guide rod 10 extending from a guiding hole 5 into the soft soil 1 and a segment rod 11 to form a whole rod, and calculating the vertical force of the rod to the anchor rod 2
Figure GDA0004211833650000151
Calculating the bending moment of the rod piece on the anchor rod 2
Figure GDA0004211833650000152
The invention can calculate and analyze the vertical force F of the rod piece on the outer tube 3 of the anchor rod 2 and the soil friction force born by the outer tube 3 to obtain the vertical force shared by the rod piece and the outer tube 3, wherein the soil friction force born by the outer tube 3 can be determined by a conventional method, for example, the axial strain is measured on the outer tube 3 in a segmented manner so as to calculate the friction resistance of lateral soil.

Claims (8)

1. An anchor rod for increasing anti-buoyancy in soft soil, which is characterized in that: comprises an outer tube, an inner tube, a chassis, a first guide rod, a sectional rod forming device and a driving device; the inner tube and the outer tube are concentric, the inner tube is rotatably arranged in the outer tube, and the chassis is fixedly arranged in the inner tube; the sectional rod forming device comprises a die box arranged on the chassis, a pressure pump for conveying curing liquid to the die box and a liquid storage box for storing the curing liquid, wherein the pilot rod is matched with the die box, and the curing liquid conveyed into the die box is cured to form a sectional rod which is fixedly connected with the pilot rod, and the width of the sectional rod is the same as that of the pilot rod; the driving device comprises two gears and a gear driving mechanism, the gears are rotatably arranged on the chassis, the gear driving mechanism is connected with the gears to drive the gears to rotate, the rotating gears drive the pilot rod or the sectional rod to move out of the outer tube, and the pilot rod and the sectional rod which are matched to move on the outer tube and the inner tube are correspondingly provided with guide holes.
2. An anchor as claimed in claim 1, wherein the anchor for increasing the resistance to buoyancy in soft soil is characterized by: the anti-floating method of the anchor rod comprises the following steps:
step 1: when the installation is started, the gear is connected with the pilot rod;
step 2: setting N sectional rods in a mould box, wherein the numbers of the sectional rods generated according to the time sequence are 1,2, … and N;
step 3: injecting the curing liquid in the liquid storage tank into the mold tank by a pressure pump, and then converting the curing liquid in the mold tank into a cured sectional rod, wherein the number of the sectional rod is 1, and the sectional rod is fixedly connected with the pilot rod;
step 4: then the gear drives the first guide rod to enter soft soil from the guiding-out hole, and the first guide rod pulls the solidified segment rod No. 1 and vacates the space in the mould box;
step 5: injecting the curing liquid in the liquid storage tank into the mold tank by a pressure pump, converting the curing liquid in the mold tank into a cured sectional rod, wherein the number of the sectional rod in the mold tank is i, and the i-th sectional rod in the mold tank is fixedly connected with the previous i-1-th sectional rod;
step 6: then the i-1 th sectional rod in gear driving contact enters soft soil from the guiding-out hole, and the i-1 th sectional rod pulls the i-th sectional rod in the mould box and vacates the space in the mould box;
step 7: repeating the steps 5-6 until the appointed number of segmented rods are driven into the soft soil.
3. An anchor as claimed in claim 1, wherein the anchor for increasing the resistance to buoyancy in soft soil is characterized by: the method for driving the first guide rod or the segmented rod to move by the gear comprises the following steps: two gears are respectively arranged at two sides of the first guide rod, and the first guide rod or the sectional rod is extruded while the two gears rotate so as to drive the first guide rod or the sectional rod to move; or racks are respectively arranged on the two sides of the pilot rod, the gears are meshed with the racks, a rack mounting device for fixing the racks on the side of the sectional rod is arranged in the die box, and the racks are meshed with the racks to drive the pilot rod or the sectional rod to move when the gears rotate.
4. A rock bolt for increasing resistance to buoyancy in soft soil according to claim 3, wherein: the rack mounting device comprises a pushing mechanism, a rack, a storage chamber, a spring and a push plate; the number of the strip storage chambers is 2 and the strip storage chambers are symmetrically arranged, a rack array is arranged in any one strip storage chamber, a spring is matched with the rack array through a push plate to push racks to move to the outlet below the strip storage chamber, two pushing mechanisms are respectively arranged below each strip storage chamber, each pushing mechanism is used for pushing racks outside the strip storage chamber to move to the other pushing mechanism for a preset distance, and the two racks moving for the preset distance are matched with a mould box and a sectional rod or a pilot rod to form a curing tank for curing liquid to be contained.
5. An anchor as claimed in any one of claims 1 to 4 wherein the anchor for increasing the resistance to buoyancy in soft soil is characterised by: the tail end of each sectional rod is provided with a connecting hole, the tail end of the corresponding sectional rod in the die box is provided with a connecting hole forming device, and the connecting hole forming device comprises a deformation body with one end fixedly connected with the die box and a temperature control system for controlling the temperature of the deformation body; the end of the first guide rod, which is contacted with the No. 1 sectional rod, is provided with a hole, the entrance of the hole is small, and the interior of the first guide rod is enlarged.
6. The anchor of claim 5, wherein the anchor further comprises a plurality of anchors for increasing the buoyancy of the soft soil: the deformation body is made of shape memory alloy, the connecting end of the deformation body and the mould box is set to be a first end, and the opposite end is set to be a second end; when the curing liquid is liquid in the mold box, the temperature control system controls the deformation body to be at a first temperature, and the first end of the deformation body is smaller than the second end at the first temperature; after the solidification liquid is converted into solid in the mold box, the temperature control system controls the deformation body to be at a second temperature, and the first end of the deformation body is larger than the second end at the second temperature.
7. An anchor as claimed in claim 1, wherein the anchor for increasing the resistance to buoyancy in soft soil is characterized by: the first auxiliary reinforcing device comprises a pull rope and a tightening device, the tightening device is arranged on the outer tube, one end of the pull rope is arranged in the tightening device, the other end of the pull rope is arranged in the guiding-out hole and is fixedly connected with the pilot rod, and the pull rope is connected with the tightening device and the pilot rod through the outer side of the outer tube; the guide rod enters the soft soil layer through the guide hole, the tightening device enables the pull rope to freely stretch, and when the guide rod enters the soft soil layer to reach the designated length, the tightening device fixes the pull rope, and the pull rope cannot freely stretch.
8. An anchor as claimed in claim 1, wherein the anchor for increasing the resistance to buoyancy in soft soil is characterized by: the adjacent guide rods are connected by using a circumferential line, the circumferential line is arranged outside the outer tube, and the circumferential line is connected with the outside of the outer tube through flexible cloth or silk screen.
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CN210917344U (en) * 2019-09-23 2020-07-03 中恒辉建设有限公司 Anti-floating anchor rod

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RU64682U1 (en) * 2007-01-23 2007-07-10 Открытое акционерное общество "Татнефть" им. В.Д. Шашина DEVICE FOR INSTALLATION AND SEALING OF A HOLE OF A CASING HOLE IN A WELL
CN205858387U (en) * 2016-04-26 2017-01-04 安徽理工大学 A kind of device noting Anchor Agent serosity for laboratory from armature boring model bottom
CN206887952U (en) * 2017-05-09 2018-01-16 成都大学 A kind of injection molding type support anchor rod device
CN113338806A (en) * 2021-05-08 2021-09-03 江苏富路建设有限公司 Ground anchor enlarged footing stock

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