CN112065433A - Pipe jacking working well supporting and water stopping assembly and construction method - Google Patents
Pipe jacking working well supporting and water stopping assembly and construction method Download PDFInfo
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- CN112065433A CN112065433A CN202010890370.2A CN202010890370A CN112065433A CN 112065433 A CN112065433 A CN 112065433A CN 202010890370 A CN202010890370 A CN 202010890370A CN 112065433 A CN112065433 A CN 112065433A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/38—Waterproofing; Heat insulating; Soundproofing; Electric insulating
Abstract
The invention relates to the technical field of machining, in particular to a pipe jacking working well supporting and water stopping assembly and a construction method, wherein the method comprises the following steps: s1, installing steel sheet piles; s2, mounting a cement mixing pile: symmetrically installing a plurality of rows of cement mixing piles at the left side and the right side of the working well; s3, construction of the mixing pile: preparing cement paste, moving a stirrer to the pile position of a stirring pile, sinking and drilling, and then spraying, stirring and lifting; s4, mounting and supporting: installing a steel purlin on the inner side of the steel sheet pile as a support; s5, after the pipe jacking construction is completed, removing the steel sheet pile and the steel purlin; the assembly comprises steel sheet piles, cement stirring piles, steel purlins and angle braces, wherein the steel purlins are square, the steel sheet piles are arranged on the outer sides of the steel purlins, the angle braces are arranged at the inner side corners of the steel purlins, and the cement stirring piles are arranged on the left side and the right side of the steel purlins; the invention provides a pipe jacking working well support, a water stopping assembly and a construction method, which have the advantages of high safety performance, water stopping, strong stability, low cost and reusability.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a pipe jacking working well supporting and water stopping assembly and a construction method.
Background
The pipe-jacking construction is a construction method of underground pipelines developed after shield construction, does not need to excavate a surface layer, and can pass through highways, railways, rivers, ground buildings, underground structures, various underground pipelines and the like. In the pipe jacking construction, by means of the thrust of a main jacking oil cylinder, an inter-pipeline relay and the like, a tool pipe or a heading machine is pushed from a working well through a soil layer until the tool pipe or the heading machine is hoisted in a receiving well. Meanwhile, the pipeline following the tool pipe or the heading machine is buried between the two wells, so that the construction method for laying the underground pipeline without excavating is realized.
The working well is an open caisson for installing jacking equipment and jacking out soil; the receiving well is an open caisson which is arranged after the construction of the jacking pipe for a section and the tool pipe or the development machine is taken out; the working well and the receiving well are starting and stopping positions of a section of pipeline, and not only are jacking and receiving working surfaces provided, but also working surfaces are provided for the construction of the inspection well at the starting and stopping points of the section of pipeline.
The problems existing in the prior art are as follows: the construction period is long, the construction cost is high, and the safety is unstable.
Disclosure of Invention
Aiming at the existing problems, the invention discloses a pipe jacking working well support, a water stopping assembly and a construction method which have the advantages of high safety performance, water stopping, strong stability, low cost and reusability.
The invention provides a pipe jacking working well supporting and water stopping construction method, which comprises the following steps:
s1, installing a steel sheet pile: installing steel sheet piles around the working well;
s2, mounting a cement mixing pile: symmetrically installing a plurality of rows of cement mixing piles at the left side and the right side of the working well;
s3, construction of the mixing pile: preparing cement paste, moving a stirrer to the pile position of a stirring pile, sinking and drilling, enabling the stirrer to stir and sink along a positioning frame, then spraying, stirring and lifting to enable the cement paste to be mixed with a soil body;
s4, mounting and supporting: installing a steel purlin on the inner side of the steel sheet pile as a support;
and S5, after the pipe jacking construction is completed, removing the steel sheet pile and the steel purlin.
Preferably, the method for installing the steel sheet pile in S1 is a screen type driving method, and the screen type driving method is as follows: inserting 10-20 steel sheet piles into the guide frame in rows to form a screen-shaped steel sheet pile, then beating the steel sheet piles in batches, beating the steel sheet piles at two ends of the screen wall to a designed elevation to form positioning sheet piles, and then beating 1/3 and 1/2 sheet piles in the middle in a step shape.
Preferably, the steel sheet pile is installed by a hydraulic plugging machine.
Preferably, 4 rows of cement mixing piles are arranged on each side in S2, the transverse interval of each row is 500-700 mm, the longitudinal interval is 500-700 mm, the diameter of each mixing pile is 500-550 mm, the length is 8-20 m, and the overlapping length of the cement mixing piles is 100-300 mm.
Preferably, the cement slurry in S3 is portland cement, the water cement ratio is 0.45-0.55, and the specific gravity of the mortar is 1.78-1.88.
Preferably, the sinking well in S3 comprises: when the pile is sunk, the stirrer is operated in a no-load mode, the steel wire rope is loosened after the stirrer is normally operated, the stirrer is enabled to be stirred and sunk along the positioning frame, during construction, the pile is sunk to the designed pile bottom elevation at a constant speed of 0.5-0.75 m/min by means of self weight of equipment, a drill bit to be stirred is close to the ground, and the drilling depth is 2000-3000 mm.
Preferably, the guniting agitation lifting in S3 includes: spraying slurry twice by using a stirring head, wherein the slurry consumption is 50% of the total consumption each time, sinking for the first time and drilling to the elevation of the pile bottom, lifting the stirring head at a uniform speed of not more than 0.8m/min, simultaneously starting a grouting pump, and spraying slurry while stirring and lifting the stirring head when the slurry reaches a slurry spraying port, so that the cement slurry is mixed with a soil body; when the stirring head sinks to the elevation of the pile bottom for the second time, the grouting pump is started, the stirring is lifted to the elevation of the designed pile top, the slurry in the collecting hopper is just emptied, the stirring head sinks 0.5m again for ensuring the soil body reinforcing quality of the pile head, the pile head is stirred once, and then the stirring is lifted to enable the stirring head to be exposed out of the ground, and the stirring head is moved to the next stirring pile for construction.
Preferably, S4 includes the steps of:
s41, mounting a first steel purlin and a horizontal support;
s42, ensuring that the horizontal support is orthogonal to the square steel purlin when the inner support is installed, and installing the corner support in time;
s43, mounting corner supports at positions of the steel purlins on the two sides at 90 degrees, and welding the corner supports on the steel purlins;
s44, repeating S41-S43 again; and (5) continuing retreating the construction of earth excavation after the installation is finished until the earth excavation of the section is finished.
Further preferably, S1 includes the steps of:
s11, determining orientation and paying off
Before the foundation pit is excavated, coordinates and dimensions shown in a drawing are installed, and an excavation side line of the foundation pit is released. Measuring and determining the position and paying off, determining the insertion position of a steel sheet pile, driving a positioning pile by adopting a crawler-type hydraulic vibration plugging machine (with a clamp), driving a steel sheet pile at the interval of about 9m, transversely arranging two steel sheet piles between the two steel sheet piles, conveying a vibration box to a steel sheet pile stacking position by using a crane when manufacturing a guide clamp for pile sinking, sleeving the steel sheet pile into a pile clamping device and clamping, randomly hoisting to a pile sinking position, vertically inserting the pile position, checking to be correct, and then starting a vibration hammer for pile sinking.
S12, adopting a hydraulic plugging machine to punch steel plates
Before the steel sheet pile is driven, firstly, checking and correcting are carried out, a guide clamp is manufactured during driving, and a positioning frame is arranged to ensure that the driving is horizontal, flat and vertical and the top standard height is consistent; the steel sheet piles are driven into the guide frame in rows by screen type driving method, 10-20 steel sheet piles are inserted into the guide frame in a screen shape, then driven into the screen shape in batches, materials such as butter and the like are filled into the locking opening before pile sinking, the steel sheet piles at two ends of the screen wall are driven to a designed elevation or a certain depth to form positioning sheet piles, and then the steel sheet piles are driven into the screen wall in a step shape in the middle according to 1/3 and 1/2 sheet piles in sequence. And a hydraulic plugging machine is adopted for driving the steel sheet piles. After the positioning piles are firstly arranged, the small seaming openings are arranged one by one in sequence. The locking notches are aligned when the steel sheet pile is inserted, and in the piling process, two theodolites are used for controlling the verticality of the steel sheet pile in two directions. In order to prevent the plane displacement of the central line of the fore shaft, a clamping plate can be arranged at the fore shaft of the steel sheet pile in the piling proceeding direction to prevent the displacement of the steel sheet pile, and simultaneously, the position of each sheet pile is firstly calculated on the purlin so as to be convenient for checking and correcting at any time; when piling, the driving positions and directions of the first and second steel sheet piles to be driven are strictly controlled to ensure the precision, the steel sheet pile driving device can play a role in guiding a sample plate, and generally, the test is carried out once every one meter is driven.
Further preferably, S3 includes the steps of:
s31, preparing the ground
And after the field is leveled, the ground is rolled by adopting an excavator crawler belt, a 20cm gravel layer is laid, and the 12T road roller is subjected to static pressure for three times.
S32, measuring and lofting
And (3) releasing the pile position of the PHC pile according to the field measurement control point, releasing the central point of each pile position by the measurement control point, and driving a small wood pile at the central point to serve as a positioning pile.
S33, preparation of cement paste
42.5-grade ordinary portland cement is adopted, the water cement ratio is 0.45-0.55, the specific gravity of the mortar is preferably 1.78-1.88, the cement is stirred by a cement slurry stirrer and then stored in a storage pool, and cement slurry is pumped to the top of a drill rod by a grouting machine through a pipeline.
S34 pile machine positioning and centering
And (3) adopting a phi 800 single-drill stirring pile machine for construction, moving the stirrer to the pile position for centering, and ensuring stable installation. After the pile machine is in place and centered, the perpendicularity of the pile tower is corrected through a 0.5-1kg conical hammer hung on the pile tower, the length of a suspension line of the conical hammer is not less than 2.5m, when the perpendicularity is corrected, the condition that the suspension line of the conical hammer is perpendicular to a main tower frame and is parallel to the main shaft of the pile machine is observed from two directions, and if deviation exists, adjustment is carried out, and the deviation of the perpendicularity is required to be not more than 0.5%.
S35, first sinking drilling
When sinking, the mixer should run in no-load, and the steel wire rope can be released after normal operation, so that the mixer sinks along the positioning frame. During construction, the pile is sunk to the designed pile bottom elevation at a constant speed of 0.5-0.75 m/min by virtue of the self weight of the equipment. And starting the high-pressure jet grouting pile machine when the stirring drill bit is close to the ground. The drilling depth is determined by a depth ruler disk, the numerical value of the drilling depth is equal to the sum of the design reinforcement depth and the height of the lateral moving groove of the pile machine from the ground, and the drilling depth is 2750 mm.
S36, first guniting, stirring and lifting
The stirring pile grouting is completed by adopting a stirring head to carry out two times of guniting, the dosage of the grout is 50% of the total dosage each time, after the grout is sunk for the first time and drilled to the designed pile bottom elevation, the stirring head is lifted at an even speed of not more than 0.8m/min, meanwhile, a grouting pump is started, when the grout reaches a guniting port, the stirring head is stirred and lifted, and the grout is sprayed, so that the grout is mixed with the soil body.
S37, secondary sinking drilling
When sinking, the mixer should run in no-load, and the steel wire rope can be released after normal operation, so that the mixer sinks along the positioning frame. During construction, the pile is sunk to the designed pile bottom elevation at a constant speed of 0.5-0.75 m/min by virtue of the self weight of the equipment. And starting the high-pressure jet grouting pile machine when the stirring drill bit is close to the ground. The drilling depth is determined by a depth ruler disk, the numerical value of the drilling depth is equal to the sum of the design reinforcement depth and the height of the lateral moving groove of the pile machine from the ground, and the drilling depth is 2750 mm.
S38, stirring and lifting the second guniting
When the stirring head sinks to the designed pile bottom elevation for the second time, the grouting pump is started, the stirring is lifted to the designed pile top elevation, and then the slurry in the collecting hopper is just emptied. In order to ensure the soil body reinforcing quality of the pile head, the stirring head is sunk for 0.5m again to stir the pile head once, then the stirring head is lifted to expose out of the ground, and the pile head is moved to the next stirring pile for construction.
And repeating the steps from S34 to S38 to finish the construction of the mixing piles row by row.
The invention provides a pipe jacking working well supporting and water stopping assembly which comprises a steel sheet pile, a cement stirring pile, a steel purlin and angle braces, wherein the steel purlin is square, the steel sheet pile is arranged on the outer side of the steel purlin, the angle braces are arranged at the inner corners of the steel purlin, and the cement stirring pile is arranged on the left side and the right side of the steel purlin.
Preferably, the steel sheet piles have different heights.
Compared with the prior art, the invention has the following advantages or beneficial effects: according to the pipe-jacking working well supporting and water-stopping construction method, the steel sheet pile is used for retaining soil, the cement mixing pile is used for stopping water, and the construction safety and the construction efficiency of the pipe-jacking working well and the receiving well are improved. The construction progress is accelerated, the potential safety hazard is reduced, the material consumption is saved, the material can be repeatedly used, and the economical efficiency is good.
Drawings
The invention and its features, aspects and advantages will become more apparent from reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference symbols in the various drawings indicate like elements. The drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a schematic structural view of a pipe-jacking working well supporting and water-stopping assembly of the present invention;
reference numerals: 1. steel sheet piles, 2 steel purlins, 3 cement mixing piles, 4 corner supports.
Detailed Description
Those skilled in the art will appreciate that variations may be implemented by those skilled in the art in combination with the prior art and the above-described embodiments, and will not be described herein in detail. Such variations do not affect the essence of the present invention and are not described herein.
As shown in fig. 1, a pipe jacking working well is strutted, stagnant water subassembly is shown, enclose purlin 2, cement stirring stake 3, knee brace 4 including steel sheet pile 1, steel, the steel encloses purlin 2 and is square, and steel sheet pile 1 sets up in the steel and encloses the purlin 2 outside, and the corner brace 4 sets up in the steel and encloses the inside angle of purlin 2, and cement stirring stake 3 sets up in the steel and encloses the left and right sides of purlin 2, and the height of steel sheet pile 1 differs.
In the embodiment, the cement mixing piles are arranged in 4 rows from left to right, the transverse spacing is 600mm, the longitudinal spacing is 600mm, the diameter of each pile is generally 500mm-550mm, and the length is 12 m. The overlapping length of the cement mixing pile is 200 mm.
The pipe-jacking working well supporting and water-stopping construction method comprises the following construction steps:
A. mounting steel sheet pile
A1 determining orientation and setting line
And before the foundation pit is excavated, according to the coordinates and the size specified by a drawing, an excavation side line of the foundation pit is released. And (5) measuring, determining the position to be measured, paying off, and determining the insertion position of the steel sheet pile. A crawler-type hydraulic vibration plugging machine (with a clamp) is adopted, firstly, positioning piles are driven, a steel sheet pile is driven at intervals of about 9m, when a guide clamp is manufactured for pile sinking, a crane sends a vibration box to a piling position of the steel sheet pile, the steel sheet pile is sleeved into a pile clamping device and clamped tightly, the steel sheet pile is randomly lifted to a pile sinking position and is vertically inserted into a pile position, and after the pile sinking position is checked to be correct, a vibration hammer is started to sink the pile.
A2 steel plate punching device adopting hydraulic plug-in machine
Before the steel sheet pile is driven, firstly, the steel sheet pile is checked and corrected. Manufacturing a guide clamp during piling, and installing a positioning frame to ensure that the piling is horizontal and vertical and the heights of the top marks are consistent;
the steel sheet piles are driven into the guide frame in rows by screen type driving method, 10-20 steel sheet piles are inserted into the guide frame in a screen shape, then driven into the screen shape in batches, materials such as butter and the like are filled into the locking opening before pile sinking, the steel sheet piles at two ends of the screen wall are driven to a designed elevation or a certain depth to form positioning sheet piles, and then the steel sheet piles are driven into the screen wall in a step shape in the middle according to 1/3 and 1/2 sheet piles in sequence. And a hydraulic plugging machine is adopted for driving the steel sheet piles. After the positioning piles are firstly arranged, the small seaming openings are arranged one by one in sequence.
The locking notches are aligned when the steel sheet pile is inserted, and in the piling process, two theodolites are used for controlling the verticality of the steel sheet pile in two directions. In order to prevent the plane displacement of the central line of the fore shaft, a clamping plate can be arranged at the fore shaft of the steel sheet pile in the piling proceeding direction to prevent the displacement of the steel sheet pile, and simultaneously, the position of each sheet pile is firstly calculated on the purlin so as to be convenient for checking and correcting at any time;
when piling, the driving positions and directions of the first and second steel sheet piles to be driven are strictly controlled to ensure the precision, the steel sheet pile driving device can play a role in guiding a sample plate, and generally, the test is carried out once every one meter is driven.
B. Installation cement mixing pile
The method is suitable for treating soil layers such as silt, mucky soil, plain filling soil, plastic clay (soft), medium-density fine sand (loose), medium-density silt (slightly dense), loess and the like.
4 rows of cement mixing piles are driven, the transverse distance is 600mm, the longitudinal distance is 600mm, the diameter of each pile is generally 500mm-550mm, and the length is 12 m. The overlapping length of the cement mixing pile is 200mm, and the slurry conveying speed is kept constant and is not less than 55kg/m 3.
C. Construction of cement mixing pile
C1. Site preparation
Construction preparation: and after the field is leveled, the ground is rolled by adopting an excavator crawler belt, a 20cm gravel layer is laid, and the 12T road roller is subjected to static pressure for three times.
C2. Survey lofting
And (3) releasing the pile position of the PHC pile according to the field measurement control point, releasing the central point of each pile position by the measurement control point, and driving a small wood pile at the central point to serve as a positioning pile.
C3. Preparation of cement paste
42.5-grade ordinary portland cement is adopted, the water cement ratio is 0.45-0.55, the specific gravity of the mortar is preferably 1.78-1.88, the cement is stirred by a cement slurry stirrer and then stored in a storage pool, and cement slurry is pumped to the top of a drill rod by a grouting machine through a pipeline.
C4. Pile machine in-place centering
And (3) adopting a phi 800 single-drill stirring pile machine for construction, moving the stirrer to the pile position for centering, and ensuring stable installation. After the pile machine is in place and centered, the perpendicularity of the pile tower is corrected through a 0.5-1kg conical hammer hung on the pile tower, the length of a suspension line of the conical hammer is not less than 2.5m, when the perpendicularity is corrected, the condition of the vertical deviation of the suspension line of the conical hammer and a main tower frame is observed from two directions vertical to and parallel to a main shaft of the pile machine, and if deviation exists, adjustment is carried out, and the deviation of the perpendicularity is required to be not more than 0.5%.
C5. First sinking drilling
When sinking, the mixer should run in no-load, and the steel wire rope can be released after normal operation, so that the mixer sinks along the positioning frame. During construction, the pile is sunk to the designed pile bottom elevation at a constant speed of 0.5-0.75 m/min by virtue of the self weight of the equipment.
And starting the high-pressure jet grouting pile machine when the stirring drill bit is close to the ground. The drilling depth is determined by a depth ruler disk, the numerical value of the drilling depth is equal to the sum of the design reinforcement depth and the height of the lateral moving groove of the pile machine from the ground, and the drilling depth is 2750 mm.
C6. First time guniting stirring lifting
The stirring pile grouting adopts the stirring head to spray twice, the slurry dosage is 50% of the total dosage each time, after the first sinking drilling is carried out to the designed pile bottom elevation, the stirring head is lifted up at the uniform speed of not more than 0.8m/min, simultaneously, the mud pump is started, when the slurry reaches the slurry spraying opening, the stirring head stirs and lifts, and the slurry is sprayed, so that the slurry is mixed with the soil body.
C7. Second time sinking drilling
When sinking, the mixer should run in no-load, and the steel wire rope can be released after normal operation, so that the mixer sinks along the positioning frame. During construction, the pile is sunk to the designed pile bottom elevation at a constant speed of 0.5-0.75 m/min by virtue of the self weight of the equipment.
And starting the high-pressure jet grouting pile machine when the stirring drill bit is close to the ground. The drilling depth is determined by a depth ruler disk, the numerical value of the drilling depth is equal to the sum of the design reinforcement depth and the height of the lateral moving groove of the pile machine from the ground, and the drilling depth is 2750 mm.
C8. Second time of guniting, stirring and lifting
When the stirring head sinks to the designed pile bottom elevation for the second time, the grouting pump is started, the stirring is lifted to the designed pile top elevation, and then the slurry in the collecting hopper is just emptied. In order to ensure the soil body reinforcing quality of the pile head, the stirring head is sunk for 0.5m again to stir the pile head once, then the stirring head is lifted to expose out of the ground, and the pile head is moved to the next stirring pile for construction.
And C4-C8 are repeated, and the construction of the mixing piles is completed row by row.
D. Mounting support
The quality of the welding seam of the workpiece is ensured, and detailed welding seam inspection is required before use. Mounting an inner support in the process of excavating the foundation pit earthwork; the method comprises the steps of setting 2 horizontal supports, firstly excavating to a sheet pile surrounding purlin and 0.5m below the supports along a measuring and placing construction line, installing the surrounding purlin and the supports in time, then excavating downwards in layers, and enabling the thickness of the excavated layers to be not more than 1 m. After the first horizontal steel pipe support corner brace is installed, excavating the trench earthwork longitudinally along the pipe trench by using an excavator, and stopping excavating when the trench is excavated to be 0.5m away from the central line of the next steel support.
D1. Enclosing purlin installation
D2. Horizontal support mounting
D3. Corner brace mounting
D1 excavating to the designed elevation, and then installing a first surrounding purlin and a horizontal support;
when the D2 inner support is installed, the horizontal support is ensured to be orthogonal to the square steel purlin, and the angle support 7 is installed in time;
d3 corner braces are arranged at the positions of the surrounding purlins at two sides at 90 degrees and are welded on the surrounding purlins;
repeating the steps D1-D3 again; and (5) continuing retreating the construction of earth excavation after the installation is finished until the earth excavation of the section is finished.
D4. Support dismantling
D4.1. After the construction of the jacking pipe is completely finished, the steel sheet pile support can be detached after the surrounding soil body is confirmed to be safe.
D4.2. Before the support is dismantled, a force transmission belt must be made between the foundation and the steel sheet pile.
D4.3. And hoisting the disassembled support out of the foundation pit by using a crane when the support is disassembled.
D4.4. The support dismantling must satisfy the principle of dismantling the support firstly and then dismantling the support secondly.
In conclusion, the pipe jacking working well support, the water stopping assembly and the construction method provided by the invention have the advantages of no influence on the surrounding environment or smaller influence, small construction site and low noise. And the underground operation can be realized, which is an incomparable advantage compared with the excavation and pipe burying in the prior art. The method provided by the invention reduces the underground operation work amount of excavation construction and avoids the trouble of underground water operation. The construction progress of the engineering is accelerated, the construction period is shortened, the working area is small, the comprehensive construction cost is low, and the construction method brings a technical revolution of underground pipeline construction. The present invention makes it possible to construct pipelines in the case where excavation construction is difficult to perform or is not allowed to be performed at all, and the pipelines can be designed to pass through at the sites where the amount of construction work is most economical and reasonable. Compared with the traditional open excavation technology, the method is more environment-friendly and economical.
The above description is of the preferred embodiment of the invention. It is to be understood that the invention is not limited to the particular embodiments described above, in that devices and structures not described in detail are understood to be implemented in a manner common in the art; those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments to equivalent variations, without departing from the spirit of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (10)
1. A pipe-jacking working well supporting and water-stopping construction method is characterized by comprising the following steps:
s1, installing a steel sheet pile: installing steel sheet piles around the working well;
s2, mounting a cement mixing pile: symmetrically installing a plurality of rows of cement mixing piles at the left side and the right side of the working well;
s3, construction of the mixing pile: preparing cement paste, moving a stirrer to the pile position of a stirring pile, sinking and drilling, enabling the stirrer to stir and sink along a positioning frame, then spraying, stirring and lifting to enable the cement paste to be mixed with a soil body;
s4, mounting and supporting: installing a steel purlin on the inner side of the steel sheet pile as a support;
and S5, after the pipe jacking construction is completed, removing the steel sheet pile and the steel purlin.
2. A pipe jacking working well supporting and water stopping construction method as claimed in claim 1, wherein the method for installing the steel sheet pile in S1 is a screen type driving method, and the screen type driving method is as follows: inserting 10-20 steel sheet piles into the guide frame in rows to form a screen-shaped steel sheet pile, then beating the steel sheet piles in batches, beating the steel sheet piles at two ends of the screen wall to a designed elevation to form positioning sheet piles, and then beating 1/3 and 1/2 sheet piles in the middle in a step shape.
3. A pipe jacking working well supporting and water stopping construction method as claimed in claim 1 or 2, wherein the steel sheet pile is installed by a hydraulic plug machine.
4. A pipe jacking working well supporting and water stopping construction method as claimed in claim 1, wherein 4 rows of cement mixing piles are arranged on each side in S2, the transverse spacing of each row is 500-700 mm, the longitudinal spacing is 500-700 mm, the diameter of each mixing pile is 500-550 mm, the length is 8-20 m, and the overlapping length of the cement mixing piles is 100-300 mm.
5. The pipe-jacking working well supporting and water-stopping construction method according to claim 1, wherein the cement slurry in S3 is portland cement, the water cement ratio is 0.45-0.55, and the specific gravity of the mortar is 1.78-1.88.
6. The pipe jacking working well supporting and water stopping construction method according to claim 1, wherein the sinking drilling in S3 comprises: when the pile is sunk, the stirrer is operated in a no-load mode, the steel wire rope is loosened after the stirrer is normally operated, the stirrer is enabled to be stirred and sunk along the positioning frame, during construction, the pile is sunk to the designed pile bottom elevation at a constant speed of 0.5-0.75 m/min by means of self weight of equipment, a drill bit to be stirred is close to the ground, and the drilling depth is 2000-3000 mm.
7. The pipe jacking working well supporting and water stopping construction method according to claim 1, wherein the slurry spraying, stirring and lifting in S3 comprises: spraying slurry twice by using a stirring head, wherein the slurry consumption is 50% of the total consumption each time, sinking for the first time and drilling to the elevation of the pile bottom, lifting the stirring head at a uniform speed of not more than 0.8m/min, simultaneously starting a grouting pump, and spraying slurry while stirring and lifting the stirring head when the slurry reaches a slurry spraying port, so that the cement slurry is mixed with a soil body; when the stirring head sinks to the elevation of the pile bottom for the second time, the grouting pump is started, the stirring is lifted to the elevation of the designed pile top, the slurry in the collecting hopper is just emptied, the stirring head sinks 0.5m again for ensuring the soil body reinforcing quality of the pile head, the pile head is stirred once, and then the stirring is lifted to enable the stirring head to be exposed out of the ground, and the stirring head is moved to the next stirring pile for construction.
8. The pipe jacking working well supporting and water stopping construction method according to claim 1, wherein S4 comprises the following steps:
s41, mounting a first steel purlin and a horizontal support;
s42, ensuring that the horizontal support is orthogonal to the square steel purlin when the inner support is installed, and installing the corner support in time;
s43, mounting corner supports at positions of the steel purlins on the two sides at 90 degrees, and welding the corner supports on the steel purlins;
s44, repeating S41-S43 again; and (5) continuing retreating the construction of earth excavation after the installation is finished until the earth excavation of the section is finished.
9. The pipe jacking working well supporting and water stopping assembly is characterized by comprising a steel plate pile, a cement stirring pile, a steel surrounding purlin and a corner brace, wherein the steel surrounding purlin is square, the steel plate pile is arranged on the outer side of the steel surrounding purlin, the corner brace is arranged at the inner side corner of the steel surrounding purlin, and the cement stirring pile is arranged on the left side and the right side of the steel surrounding purlin.
10. The pipe jacking working well supporting and water stopping assembly of claim 9, wherein the steel sheet piles are different in height.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113027463A (en) * | 2021-03-24 | 2021-06-25 | 山东建筑大学 | Suspension type reverse wall working well supporting structure and construction method |
| CN113027463B (en) * | 2021-03-24 | 2022-08-30 | 山东建筑大学 | Suspension type reverse wall working well supporting structure and construction method |
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