CN113309130A - Open caisson controllable sinking construction method - Google Patents

Open caisson controllable sinking construction method Download PDF

Info

Publication number
CN113309130A
CN113309130A CN202110746469.XA CN202110746469A CN113309130A CN 113309130 A CN113309130 A CN 113309130A CN 202110746469 A CN202110746469 A CN 202110746469A CN 113309130 A CN113309130 A CN 113309130A
Authority
CN
China
Prior art keywords
open caisson
lifting
sinking
steel
steel strand
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110746469.XA
Other languages
Chinese (zh)
Inventor
郑立宁
胡熠
胡怀仁
巫晨笛
邱月
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Southwest Architectural Design and Research Institute Co Ltd
China Construction Underground Space Co Ltd
Original Assignee
China Southwest Architectural Design and Research Institute Co Ltd
China Construction Underground Space Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Southwest Architectural Design and Research Institute Co Ltd, China Construction Underground Space Co Ltd filed Critical China Southwest Architectural Design and Research Institute Co Ltd
Priority to CN202110746469.XA priority Critical patent/CN113309130A/en
Publication of CN113309130A publication Critical patent/CN113309130A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D23/00—Caissons; Construction or placing of caissons
    • E02D23/08—Lowering or sinking caissons
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/04—Making large underground spaces, e.g. for underground plants, e.g. stations of underground railways; Construction or layout thereof
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D29/00—Independent underground or underwater structures; Retaining walls
    • E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C9/00—Measuring inclination, e.g. by clinometers, by levels
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2300/00—Materials
    • E02D2300/0004—Synthetics
    • E02D2300/0018—Cement used as binder
    • E02D2300/002—Concrete

Abstract

The invention discloses a controllable sinking construction method for an open caisson, which comprises the following steps: s1, manufacturing a locking notch ring; s2, manufacturing a blade foot ring; s3, mounting lifting equipment, a winding reel, a pump station and an inclinometer; s4, sequentially connecting a winding reel, a lifting device and a cutting edge; s5, controlling the open caisson to sink; s6, injecting thixotropic slurry; s7, correcting deviation; s8, sinking the open caisson to a designed elevation; and S9, completing the open caisson construction. The open caisson controllable sinking construction method provided by the invention can effectively prevent sudden problems of too fast sinking, sudden sinking, over sinking and the like of the open caisson wall, and the safety of constructors and the stability of the surrounding environment are guaranteed. The invention can also accurately correct the well wall of the sinking well which is already constructed by a correction algorithm, strictly controls the deviation angle within an allowable range and is beneficial to ensuring the quality of the sinking well construction.

Description

Open caisson controllable sinking construction method
Technical Field
The invention belongs to the technical field of civil engineering construction, and particularly relates to a controllable sinking construction method for an open caisson.
Background
In recent years, with the increase of urban population in China, urban land resources are more and more scarce, and urban underground space engineering such as subways, comprehensive pipe galleries, underground shaft tube car warehouses and the like is rapidly developed. The open caisson is an important means for building underground engineering structures or deep foundations, and has obvious advantages in the aspects of construction period, construction cost, safety and the like compared with other methods. However, when the open caisson sinks only by the action of self weight, sudden accidents such as too fast sinking, sudden sinking, inclination, over sinking and the like are often caused by factors such as over soft soil, uneven hardness of stratum, irregular soil excavation, biased load and the like, adverse consequences are brought to the stability of the surrounding environment, the safety of personnel and the engineering quality, and the engineering cost generated by the subsequent procedures such as deviation correction and the like is greatly increased.
Disclosure of Invention
The invention aims to solve the problems and provides a sinking well construction method which is convenient to operate, low in manufacturing cost and controllable in posture.
In order to solve the technical problems, the technical scheme of the invention is as follows: a controllable sinking construction method for an open caisson comprises the following steps:
s1, manufacturing a locking ring: firstly, excavating a circular foundation pit, manufacturing a locking ring in the foundation pit, arranging a lifting and placing fixing piece of pre-buried lifting and placing equipment, a steel strand bundle penetrating hole channel and a steel strand guide steel plate in the locking ring, and arranging a well wall lowering guide wheel on the locking ring along the circumferential direction;
s2, manufacturing a blade foot ring: assembling and connecting a plurality of prefabricated steel blade boots into a ring shape at the bottom of a foundation pit, binding blade foot reinforcing steel bars in the steel blade boot space, pouring concrete to complete the manufacture of a blade foot ring, and installing an inclinometer embedded part on a blade foot of the blade foot ring;
s3, mounting lifting equipment, a winding reel, a pump station and an inclinometer: mounting lifting equipment on a lifting fixing piece on a locking notch ring, mounting a winding reel and a pump station on the ground near the lifting equipment, and mounting an inclinometer on an inclinometer embedded part;
s4, sequentially connecting the winding reel, the lifting and placing device and the cutting edge: unwinding the steel strands from a winding reel, penetrating the steel strands into lifting and releasing equipment one by one, arranging the steel strands at the telescopic end of the lifting and releasing equipment, and connecting a strand penetrating channel of the steel strands with an anchorage device;
s5, controlling the sinking of the open caisson: connecting the blade foot ring with the wall of the open caisson, and uniformly embedding grouting pipes in the wall of the open caisson along the circumferential direction; the outer diameter of the well wall of the open caisson is smaller than the inner diameter of the cutting edge, and a slurry storage groove is formed between the well wall and the rock-soil body; digging soil in the open caisson, reserving a soil dike layer around the cutting edge at the bottom of the cutting edge ring, and controlling the well wall of the open caisson to sink through opening and closing an anchorage device in the lifting and placing equipment and stretching of an oil cylinder piston;
s6, injecting thixotropic slurry: in the sinking process of the open caisson, thixotropic slurry is injected into a slurry storage tank behind the wall of the well through a pre-embedded grouting pipe to play a role in lubricating the sinking, and a role in stabilizing the stability of a soil body behind the wall is played through the pressure of the slurry;
s7, deviation rectifying operation: before and after sinking of the open caisson is started, deviation rectifying operation is carried out, wherein the deviation rectifying operation is realized by a deviation rectifying algorithm according to inclination data fed back by an inclinometer by lifting equipment;
s8, sinking the open caisson to a designed elevation: repeating the steps of S5, S6 and S7 until the open caisson sinks to the designed elevation, and then injecting cement slurry into the pre-buried grouting pipe to replace the thixotropic slurry;
s9, completing open caisson construction: and (S8) after the cement slurry strength reaches the design strength, constructing a concrete bottom sealing layer and a bottom plate at the bottom in the open caisson, and completing the construction of the open caisson.
Further, in the step S1, the locking ring is of a cast-in-place reinforced concrete structure, the locking ring is divided into a top plate and a side plate, the thickness of the top plate at the part where the lifting and placing equipment is installed is greater than that of the side plate, the steel strand penetrating hole channel is located in the locking ring at the position where the lifting and placing equipment is placed, and the width of the hole channel is required to ensure that the steel strand can pass through; the steel strand wires that the steel strand wires direction steel sheet lies in the fore shaft ring are worn to restraint the tunnel and are the arc in, can prevent that the steel strand wires from transferring the damage that the excessive friction of in-process and concrete leads to.
Further, in the step S1, the plurality of guiding wheels for lowering the well wall are uniformly installed on the locking ring, so that the horizontal component force of the well wall, which is applied by the lifting and placing device in the sinking process, is uniform, and the horizontal displacement is not generated.
Further, a positioning steel plate and an anchor bolt are arranged at the bottom of the lifting and placing fixing piece in the step S1, and the positioning steel plate is connected with the locking collar through the anchor bolt.
Furthermore, in the step S2, the steel blade shoe is formed by welding shaped steel plates, a steel strand threading second hole and an anchor groove are reserved in the steel blade shoe, the anchor is located in the anchor groove, the turning position of the steel strand threading second hole is of an arc-shaped structure, so that the steel strand does not generate stress concentration, and adjacent steel blade shoes are fastened and connected by bolts.
Further, the number of the lifting and placing devices in the step S3 is six, and the six lifting and placing devices are numbered 1 to 6 in sequence. During installation, No. 1 to No. 6 are installed at intervals of 60-degree central angles in the anticlockwise direction, the central connecting line of lifting points of No. 1 and No. 6 lifting and placing equipment is set as an X axis, the pointing No. 1 is the forward direction, the bisector of the central connecting line of the lifting points of No. 2 and No. 3 lifting and placing equipment is set as a Y axis, and the pointing upward direction is the forward direction.
Further, in the step S3, the number of the inclinometers is three, and an included angle between adjacent inclinometers is 120 °; when the inclinometer is installed, the X, Y marks on the inclinometer are coincident with the directions of the X axis and the Y axis and have the same sign direction.
Further, in the step S4, the order of each anchor hole of the anchor device through which each steel strand penetrates into the lifting and releasing device is as follows: from left to right and from top to bottom; and after passing through the steel strand bundle penetrating hole and the steel strand bundle penetrating second hole, each steel strand penetrates into the anchorage device in the anchor groove, and the penetrating sequence is from left to right and from top to bottom.
Further, in the step S5, the caisson wall is manufactured by adopting a cast-in-place reinforced concrete structure.
Further, in the step S5, when the anchor in the anchor groove contacts the excavation surface at the bottom of the foundation pit, the sinking of the open caisson is stopped, and the rock-soil mass blocks the downward movement of the anchor to prevent the steel strand from being loosened.
The invention has the beneficial effects that:
1. the open caisson controllable sinking construction method provided by the invention can effectively prevent sudden problems of too fast sinking, sudden sinking, over sinking and the like of the open caisson wall, and the safety of constructors and the stability of the surrounding environment are guaranteed. In addition, the invention can also carry out accurate deviation correction on the wall of the sinking well which is already constructed by a deviation correction algorithm, strictly controls the deviation angle within an allowable range and is beneficial to ensuring the quality of sinking well construction.
2. The guide wheel for lowering the well wall can restrict the sinking path of the well wall of the open caisson, so that the horizontal displacement of the open caisson after sinking is controlled within the allowable deviation.
Drawings
FIG. 1 is a schematic diagram of the steps of a controllable sinking construction method for an open caisson of the invention;
FIG. 2 is a schematic plan view of the open caisson of the present invention;
FIG. 3 is a schematic cross-sectional view A-A of FIG. 2 according to the present invention;
FIG. 4 is a schematic cross-sectional view of B-B of FIG. 2 according to the present invention;
FIG. 5 is a schematic plan view of an inclinometer arrangement of the present invention;
FIG. 6 is a schematic view of the construction of the pick-and-place apparatus of the present invention;
FIG. 7 is an elevational view of a single blade shoe of the present invention;
FIG. 8 is a plan view of a single blade shoe of the present invention;
figure 9 is a schematic view of the steel blade shoe assembled into a ring of the present invention.
Description of reference numerals: 1. a locking collar; 2. lifting and placing equipment; 3. lowering a guide wheel from a well wall; 4. a blade foot ring; 5. a spool; 6. a pump station; 7. an inclinometer; 8. an anchorage device; 9. a grouting pipe; 10. a slurry storage tank; 11. lifting and placing the fixing piece; 12. a steel strand bundle penetrating hole channel; 13. the steel strand is guided to the steel plate; 14. a top plate; 15. a side plate; 16. positioning a steel plate; 41. an inclinometer embedded part; 42. the steel strand penetrates through a second pore channel; 43. and (4) an anchor groove.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments:
as shown in fig. 1 to 9, the open caisson controllable sinking construction method provided by the invention comprises the following steps:
s1, manufacturing the locking ring 1: firstly, a circular foundation pit is excavated, a locking ring 1 is manufactured in the foundation pit, a lifting fixing piece 11, a steel strand bundle penetrating hole channel 12 and a steel strand guide steel plate 13 of pre-embedded lifting equipment 2 are arranged in the locking ring 1, and a well wall lowering guide wheel 3 is arranged on the locking ring 1 along the circumferential direction. In this embodiment, the lifting and placing device is a prior art device.
In the step S1, the fore shaft ring 1 is of a cast-in-place reinforced concrete structure, the fore shaft ring 1 is divided into a top plate 14 and a side plate 15, the thickness of the top plate 14 at the part where the lifting and placing equipment 2 is installed is larger than that of the side plate 15, and the anti-shearing and punching capabilities of the concrete structure under the action force of the lifting and placing equipment are facilitated. The steel strand penetrating hole 12 is located in the locking ring 1 at the position where the lifting device 2 is placed, and the width of the hole is such that the steel strand can pass through the hole. The steel strand guide steel plate 13 is positioned in the steel strand penetrating hole 12 in the locking ring 1 and is arc-shaped, so that damage caused by excessive friction between the steel strand and concrete in the lowering process can be prevented, and safety is improved.
In the step S1, the plurality of well wall lowering guide wheels 3 are uniformly arranged on the locking ring 1, so that the horizontal component force of the well wall subjected to the acting force of the lifting device 2 in the sinking process is uniform, and the horizontal displacement is avoided. In step S1, a positioning steel plate 16 and an anchor bolt are disposed at the bottom of the lifting and placing fixture 11, and the positioning steel plate 16 is connected to the fore shaft ring 1 through the anchor bolt.
S2, manufacturing the edge foot ring 4: a plurality of prefabricated steel blade boots are spliced and connected into a ring shape at the bottom of a foundation pit, concrete is poured after blade foot reinforcing steel bars are bound in the space of the steel blade boots, the blade foot ring 4 is manufactured, and an inclinometer embedded part 41 is installed on the blade foot of the blade foot ring 4.
In the step S2, the steel blade shoe is formed by welding shaped steel plates, a steel strand bundle penetrating second channel 42 and an anchor groove 43 are reserved in the steel blade shoe, the anchor 8 is located in the anchor groove 43, the turning position of the steel strand bundle penetrating second channel 42 is of an arc-shaped structure, stress concentration of the steel strand at the position can be avoided, and adjacent steel blade shoes are fastened and connected through bolts.
S3, mounting the lifting device 2, the winding reel 5, the pump station 6 and the inclinometer 7: and mounting lifting equipment 2 on a lifting fixing piece on the locking ring 1, mounting a winding reel and a pump station on the ground near the lifting equipment, and mounting an inclinometer on an inclinometer embedded part.
The pump station 6 is communicated with the lifting and releasing equipment 2 through a pipeline, and the pump station 6 and the lifting and releasing equipment 2 are both existing mature technology equipment. The lifting equipment 2 is hydraulic telescopic equipment, and the pump station 6 is used for telescopic movement oil supply and return operation of the lifting equipment 2.
The number of the lifting and placing devices 2 in the step S3 is six, and the six lifting and placing devices 2 are numbered 1 to 6 in sequence. During installation, No. 1 to No. 6 are installed at intervals of 60-degree central angles in the anticlockwise direction, the central connecting line of lifting points of No. 1 and No. 6 lifting and placing equipment is set as an X axis, the pointing No. 1 is the forward direction, the bisector of the central connecting line of the lifting points of No. 2 and No. 3 lifting and placing equipment is set as a Y axis, and the pointing upward direction is the forward direction. The lifting and placing equipment 2 has more lifting points, and the subsequent correction operation is more flexible. Compared with the three lifting and placing devices, the six lifting and placing devices are arranged at intervals of 120 degrees, and the six arrangement modes have higher safety redundancy.
In step S3, the inclinometers 7 are three, the included angle between adjacent inclinometers 7 is 120 °, and the X, Y marks on the inclinometers 7 coincide with the X axis and the Y axis and have the same sign direction when installed.
The three inclinometers 7 can select the relatively accurate data of one inclinometer 7 as the basis for deviation correction by comparing the data of each inclinometer 7. The situation that only one or two inclinometers 7 are adopted and cannot be perceived when data are abnormal is avoided.
S4, sequentially connecting the winding reel 5, the lifting and placing device 2 and the cutting edge: and (3) unwinding the steel strands from the winding reel 5, penetrating the steel strands into the lifting and releasing equipment 2 one by one, arranging the steel strands at the telescopic end of the lifting and releasing equipment 2, and connecting the steel strand penetrating hole 12 with the anchorage device 8.
In the step S4, the order of each steel strand penetrating into each anchor hole of the anchor 8 of the lifting and placing device 2 is as follows: from left to right and from top to bottom; after passing through the steel strand threading hole 12 and the steel strand threading second hole 42, each steel strand penetrates into the anchorage 8 in the anchor groove 43, and the penetrating sequence is from left to right and from top to bottom. The conditions of uneven stress, difficult wire outlet of a winding reel and the like caused by the winding of the steel strands are prevented through the perforation sequence.
S5, controlling the sinking of the open caisson: the blade foot ring 4 is connected with the wall of the open caisson, and grouting pipes 9 are uniformly embedded in the wall of the open caisson along the circumferential direction. The outer diameter of the well wall of the well is smaller than the inner diameter of the blade foot, and a slurry storage groove 10 is formed between the well wall and the rock-soil body. And (3) digging soil in the open caisson, wherein the center of the open caisson is dug firstly, and a soil embankment layer is reserved around the edge at the bottom of the edge ring 4. The wall of the open caisson is controlled to sink through the lifting device 2.
And in the step S5, the wall of the open caisson is manufactured by adopting a cast-in-place reinforced concrete structure. In step S5, when the anchor 8 in the anchor groove 43 contacts the excavation surface at the bottom of the foundation pit, the sinking of the open caisson is stopped, and the rock-soil mass blocks the downward movement of the anchor 8 to prevent the steel strand from loosening.
S6, injecting thixotropic slurry: in the sinking process of the open caisson, thixotropic slurry is injected into a slurry storage tank 10 behind the wall of the well through an embedded grouting pipe 9, so that the effect of lubricating and sinking is achieved, the effect of stabilizing the stability of a soil body behind the wall is achieved through slurry pressure, and the liquid level of the thixotropic slurry is kept not to fall.
S7, deviation rectifying operation: before and after sinking of the open caisson is started, deviation rectifying operation is carried out, and the deviation rectifying operation is realized by a deviation rectifying algorithm according to inclination data fed back by the inclinometer 7 by the lifting equipment.
Step S7 further includes the following sub-steps:
and S71, measuring the inclination angle of the wall of the caisson in the direction X, Y by an inclinometer.
And S72, calculating the vertical deviation of each lifting point through a trigonometric function according to the inclination angle and the relative position of each lifting point to X, Y.
And S73, lifting or lowering the lifting and lowering equipment according to the calculated vertical deviation of each lifting and lowering point, so as to realize deviation correction of the well wall.
The calculation process is as follows:
the radius of the inner wall of the open caisson is set as r, the X-axis angle measurement value of the inclinometer at a certain moment is theta X, and the Y-axis angle measurement value is theta Y.
Then the vertical direction deviation of the lifting and hoisting point of the lifting and placing equipment No. 1 is as follows: h is1＝r╳sinθx；
The vertical direction deviation of the lifting point of the lifting and placing equipment No. 2: h is2＝r╳(0.5╳sinθx+0.866╳sinθy)；
The lifting and hanging point vertical direction deviation of the No. 3 lifting and placing equipment is as follows: h is3＝r╳(0.866╳sinθy-0.5╳sinθx)；
The lifting and hanging point vertical direction deviation of No. 4 lifting and placing equipment: h is4＝-h1；
The vertical direction deviation of the lifting point of the No. 5 lifting and placing equipment is as follows: h is5＝-h2；
No. 6 promotes the vertical direction deviation of the lifting point of putting equipment: h is6＝-h3；
Wherein "h" represents a vertical direction deviation. After the deviation of the lifting points of each oil cylinder in the vertical direction is obtained through calculation, the deviation can be corrected by adopting two modes, namely a lowering deviation correcting method and a lifting deviation correcting method. The lowering deviation rectifying method takes the lowest point of the six lifting points as a zero point, calculates the relative vertical direction deviation of other points, and then lowers the high point to the zero point through the lifting and lowering equipment. The lowering deviation rectifying method is suitable for soft soil, namely soil below the blade foot can be easily cut, and the lowering deviation rectifying method has a deviation rectifying space. The lifting deviation rectifying method is characterized in that the highest point is used as a zero point, the deviation of other points in the vertical direction is calculated, and then the low point is lifted to the zero point through lifting and placing equipment. The lifting deviation rectifying method is suitable for the condition that the ideal deviation rectifying effect cannot be achieved by adopting the lowering deviation rectifying method, and is generally suitable for hard soil and soft rock.
S8, sinking the open caisson to a designed elevation: and repeating the steps of S5, S6 and S7 until the open caisson sinks to the designed elevation, and then injecting cement slurry into the embedded grouting pipe 9 to replace the thixotropic slurry.
S9, completing open caisson construction: and (S8) after the cement slurry strength reaches the design strength, constructing a concrete bottom sealing layer and a bottom plate at the bottom in the open caisson, and completing the construction of the open caisson.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention and are to be construed as being without limitation to such specifically recited embodiments and examples. Those skilled in the art can make various other specific changes and combinations based on the teachings of the present invention without departing from the spirit of the invention, and these changes and combinations are within the scope of the invention.

Claims (10)

1. A controllable sinking construction method for an open caisson is characterized by comprising the following steps:
s1, manufacturing a locking ring (1): firstly, excavating a circular foundation pit, manufacturing a locking ring (1) in the foundation pit, arranging a lifting fixing piece (11), a steel strand bundle penetrating channel (12) and a steel strand guide steel plate (13) of pre-buried lifting equipment (2) in the locking ring (1), and arranging a well wall lowering guide wheel (3) on the locking ring (1) along the circumferential direction;
s2, manufacturing a blade foot ring (4): assembling and connecting a plurality of prefabricated steel blade boots into a ring shape at the bottom of a foundation pit, binding blade foot reinforcing steel bars in the steel blade boot space, pouring concrete to complete the manufacture of a blade foot ring (4), and installing an inclinometer embedded part (41) on a blade foot of the blade foot ring (4);
s3, mounting the lifting device (2), the winding reel (5), the pump station (6) and the inclinometer (7): mounting lifting equipment (2) on a lifting fixing piece on a locking ring (1), mounting a winding reel and a pump station on the ground near the lifting equipment, and mounting an inclinometer on an inclinometer embedded part;
s4, sequentially connecting the winding reel (5), the lifting and placing device (2) and the cutting edge: unwinding the steel strands from the winding reel (5), penetrating the steel strands into the lifting and releasing equipment (2) one by one, arranging the steel strands at the telescopic end of the lifting and releasing equipment (2), and connecting the steel strand penetrating pore channel (12) with the anchorage device (8);
s5, controlling the sinking of the open caisson: the blade foot ring (4) is connected with the wall of the open caisson, and grouting pipes (9) are uniformly embedded in the wall of the open caisson along the circumferential direction; the outer diameter of the well wall of the open caisson is smaller than the inner diameter of the cutting edge, and a slurry storage groove (10) is formed between the well wall and the rock-soil body; digging soil in the open caisson, reserving a soil dike layer around the cutting edge at the bottom of the cutting edge ring (4), and controlling the well wall of the open caisson to sink through opening and closing an anchorage device (8) in the lifting and placing equipment (2) and stretching of an oil cylinder piston;
s6, injecting thixotropic slurry: in the sinking process of the open caisson, thixotropic slurry is injected into a slurry storage tank (10) behind the wall of the well through a pre-embedded grouting pipe (9) to play a role in lubricating and sinking, and a role in stabilizing the stability of a soil body behind the wall is played through the pressure of the slurry;
s7, deviation rectifying operation: before and after sinking of the open caisson is started, deviation rectifying operation is carried out, wherein the deviation rectifying operation is realized by a deviation rectifying algorithm according to inclination data fed back by an inclinometer (7) by lifting equipment;
s8, sinking the open caisson to a designed elevation: repeating the steps of S5, S6 and S7 until the open caisson sinks to the designed elevation, and then injecting cement slurry into the pre-buried grouting pipe (9) to replace the thixotropic slurry;
s9, completing open caisson construction: and (S8) after the cement slurry strength reaches the design strength, constructing a concrete bottom sealing layer and a bottom plate at the bottom in the open caisson, and completing the construction of the open caisson.
2. The open caisson controllable sinking construction method according to claim 1, wherein: in the step S1, the locking ring (1) is of a cast-in-place reinforced concrete structure, the locking ring (1) is divided into a top plate (14) and a side plate (15), the thickness of the part, where the lifting and placing equipment (2) is installed, of the top plate (14) is larger than that of the side plate (15), the steel strand penetrating hole channel (12) is located in the locking ring (1) where the lifting and placing equipment (2) is placed, and the width of the hole channel is required to ensure that the steel strands can pass through; the steel strand guide steel plate (13) is positioned in the steel strand bundle penetrating hole (12) of the locking ring (1) and is arc-shaped, so that damage caused by excessive friction between the steel strand and concrete in the lowering process can be prevented.
3. The open caisson controllable sinking construction method according to claim 1, wherein: in the step S1, the plurality of well wall lowering guide wheels (3) are uniformly arranged on the locking ring (1), so that the horizontal component force of the well wall subjected to the acting force of the lifting equipment (2) in the sinking process is uniform, and the horizontal displacement is avoided.
4. The open caisson controllable sinking construction method according to claim 1, wherein: and in the step S1, a positioning steel plate (16) and an anchor bolt are arranged at the bottom of the lifting fixing piece (11), and the positioning steel plate is connected with the locking ring (1) through the anchor bolt.
5. The open caisson controllable sinking construction method according to claim 1, wherein: in the step S2, the steel blade shoe is formed by welding shaped steel plates, a steel strand penetrating second pore passage (42) and an anchor groove (43) are reserved in the steel blade shoe, the anchor (8) is located in the anchor groove (43), the turning part of the steel strand penetrating second pore passage (42) is of an arc-shaped structure, stress concentration of the steel strand at the position can be avoided, and adjacent steel blade shoes are fastened and connected through bolts.
6. The open caisson controllable sinking construction method according to claim 1, wherein: the number of the lifting and placing devices (2) in the step S3 is six, and the six lifting and placing devices (2) are numbered from 1 to 6 in sequence. During installation, No. 1 to No. 6 are installed at intervals of 60-degree central angles in the anticlockwise direction, the central connecting line of lifting points of No. 1 and No. 6 lifting and placing equipment is set as an X axis, the pointing No. 1 is the forward direction, the bisector of the central connecting line of the lifting points of No. 2 and No. 3 lifting and placing equipment is set as a Y axis, and the pointing upward direction is the forward direction.
7. The open caisson controllable sinking construction method according to claim 6, wherein: in the step S3, the number of the inclinometers (7) is three, and the included angle between every two adjacent inclinometers (7) is 120 degrees; when the inclinometer (7) is installed, the X, Y marks are coincident with the X-axis direction and the Y-axis direction and have the same sign direction.
8. The open caisson controllable sinking construction method according to claim 5, wherein: and in the step S4, the sequence of each steel strand penetrating into each anchor hole of the anchor (8) of the lifting and releasing equipment (2) is as follows: from left to right and from top to bottom; after each steel strand passes through the steel strand bundle penetrating hole (12) and the steel strand bundle penetrating second hole (42), the steel strand penetrates into the anchorage device (8) in the anchor groove (43), and the penetrating sequence is from left to right and from top to bottom.
9. The open caisson controllable sinking construction method according to claim 1, wherein: and in the step S5, the wall of the open caisson is manufactured by adopting a cast-in-place reinforced concrete structure.
10. The open caisson controllable sinking construction method according to claim 1, wherein: and in the step S5, when the anchorage device (8) in the anchor groove (43) contacts the excavation surface at the bottom of the foundation pit, the sinking of the open caisson is stopped, and the looseness of the steel strand caused by the downward movement of the anchorage device (8) blocked by the rock-soil body is prevented.
CN202110746469.XA 2021-07-01 2021-07-01 Open caisson controllable sinking construction method Pending CN113309130A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110746469.XA CN113309130A (en) 2021-07-01 2021-07-01 Open caisson controllable sinking construction method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110746469.XA CN113309130A (en) 2021-07-01 2021-07-01 Open caisson controllable sinking construction method

Publications (1)

Publication Number Publication Date
CN113309130A true CN113309130A (en) 2021-08-27

Family

ID=77381411

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110746469.XA Pending CN113309130A (en) 2021-07-01 2021-07-01 Open caisson controllable sinking construction method

Country Status (1)

Country Link
CN (1) CN113309130A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113982011A (en) * 2021-10-25 2022-01-28 中铁工程装备集团有限公司 Open caisson heading machine guiding system and method based on static inclinometer
CN114575367A (en) * 2022-04-22 2022-06-03 广东韩江工程总承包有限公司 Concrete open caisson construction method
CN117005870A (en) * 2023-09-08 2023-11-07 中铁七局集团广州工程有限公司 Deviation correction detection device and method for curve jacking engineering

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113982011A (en) * 2021-10-25 2022-01-28 中铁工程装备集团有限公司 Open caisson heading machine guiding system and method based on static inclinometer
CN114575367A (en) * 2022-04-22 2022-06-03 广东韩江工程总承包有限公司 Concrete open caisson construction method
CN117005870A (en) * 2023-09-08 2023-11-07 中铁七局集团广州工程有限公司 Deviation correction detection device and method for curve jacking engineering
CN117005870B (en) * 2023-09-08 2024-03-05 中铁七局集团广州工程有限公司 Deviation correction detection device and method for curve jacking engineering

Similar Documents

Publication Publication Date Title
CN113309130A (en) Open caisson controllable sinking construction method
CN110374633B (en) Tunnel opening section construction method for tunnel to pass through loose body
CN110158649B (en) Construction method for adjacent underground pipeline during open caisson sinking construction
CN111101540B (en) Construction method for passing existing electric power tunnel on open cut tunnel
CN108999225B (en) Inclination correcting method for rotary shifting brick-concrete structure building
CN110258582A (en) Bearing diagonal foundation pit supporting construction and construction method based on steel-pipe pile Yu Larsen steel plate
CN206408630U (en) Anchor head is placed in the Pile-Anchor Supporting for Deep Excavation system of pile body
CN110206071A (en) A kind of diaphram wall seam reinforcement means and device
CN111335912B (en) Large-pipe-diameter mechanical pipe jacking construction process for soft soil foundation in collapsible loess area
CN110241863B (en) Soft soil foundation pit excavation process pipe gallery deformation control device and control method thereof
CN113216228A (en) Construction process of combined pile cofferdam
CN110331735A (en) A kind of tower crane mounting structure for coastal region soft layer
CN115717397A (en) Larsen steel sheet pile and prestressed anchor cable combined supporting construction method
CN110486531A (en) It a kind of artificial push pipe and rams and manages united pipeline construction method
CN116044437A (en) Tunnel supporting isolation system and construction method thereof
CN105350547A (en) Method applicable to inter-pile soil support of slope protection pile
CN212358029U (en) Tunnel type anchorage structure for cable crane
CN114892648A (en) Construction method for upright post pile and uplift pile
CN114293567A (en) Construction method for improving bearing capacity of natural foundation by embedding basic raft plates into slope protection piles
CN114108652A (en) Barrier-removing and pile-forming integrated construction method for foundation pit support structure containing confined water layer
CN107447775A (en) Landslide disaster body makes ground draining reinforced earth retaining wall structure
CN111593735A (en) Vertical shaft structure and construction method thereof
CN113605934B (en) Reinforced structure for preventing tunnel uphill from slipping down and construction method thereof
CN115559295A (en) Construction method of underground continuous wall
CN218373791U (en) Super large diameter underground water delivery pipe protection system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination