CN115288113A - Reinforced structure for jacking and withdrawing of jacking pipe and construction method thereof - Google Patents
Reinforced structure for jacking and withdrawing of jacking pipe and construction method thereof Download PDFInfo
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- CN115288113A CN115288113A CN202210872656.7A CN202210872656A CN115288113A CN 115288113 A CN115288113 A CN 115288113A CN 202210872656 A CN202210872656 A CN 202210872656A CN 115288113 A CN115288113 A CN 115288113A
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- 238000004062 sedimentation Methods 0.000 claims abstract description 21
- 230000007246 mechanism Effects 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 97
- 239000010959 steel Substances 0.000 claims description 97
- 238000006243 chemical reaction Methods 0.000 claims description 85
- 230000002787 reinforcement Effects 0.000 claims description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 230000005641 tunneling Effects 0.000 claims description 6
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- 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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F3/00—Sewer pipe-line systems
- E03F3/04—Pipes or fittings specially adapted to sewers
- E03F3/046—Open sewage channels
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/10—Making by using boring or cutting machines
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Abstract
The invention discloses a pipe jacking and back-out reinforcing structure which comprises an open drainage ditch, a sedimentation tank, a high-pressure jet grouting pile, a waterproof curtain, a dewatering well and a pipe jacking and back-out reinforcing mechanism, wherein the open drainage ditch is arranged on the top of a pipe jacking pipe; the drainage open trench is arranged on the outer side of the construction road and the working well; the sedimentation tank is arranged beside the jacking pipe of the working well; the high-pressure jet grouting piles are arranged on two sides of the opening of the working well and are arranged along the jacking direction of the jacking pipe; two groups of waterproof curtains are arranged on the outer sides of the high-pressure jet grouting piles respectively; two groups of dewatering wells are arranged on two sides of the opening of the working well respectively and arranged along the jacking direction of the jacking pipe; the jacking pipe back-jacking and withdrawing reinforcing mechanism is arranged in the working well, so that the jacking pipe can be reversely back-jacking and withdrawing conveniently. The invention also provides a construction method for the pipe jacking and withdrawing reinforced structure. The invention can reinforce the hole when the pipeline exits the working well, effectively prevent the soil layer on the upper part of the hole from collapsing when the jacking pipe is jacked back, and effectively prevent the hole from flooding a large amount of water when the jacking pipe is jacked back.
Description
Technical Field
The invention belongs to the technical field of pipe jacking construction, and particularly relates to a pipe jacking and withdrawing reinforced structure and a construction method thereof.
Background
At present, a pipe jacking construction generally utilizes a pipe jacking tunneling machine to excavate earth, the end part of the tunneling machine cuts soil, performs grouting and stirring, and then discharges the soil in a slurry form. In the jacking process of the heading machine, the pipe jacking machine cannot work due to frequent tripping caused by overlarge current of the main machine. The reason for the fault is that the underground water pressure is too high, the rock material is accumulated in the feeding bin in the jacking process of the cutter head, the rock material is decomposed and fed in an unbalanced manner, water seepage occurs at the sealing position of the cutter head of the power box of the pipe jacking machine head, oil leaks at the connecting position of the power motor and the feeding bin, the jacking resistance is increased, and the main motor is tripped due to too high current. At which point the completed pipe needs to be withdrawn from the work well. At present, the measures for withdrawing the pipeline from the working well are generally as follows: the pipe jacking equipment is used for directly jacking out the pipeline in the working well, and the mode can damage the opening when the pipeline goes out of the hole, so that a large amount of sewage is poured into the working well, and soil layers on the upper part of the opening are collapsed.
Disclosure of Invention
The invention aims to provide a reinforcing structure for back jacking and withdrawing of a jacking pipe and a construction method thereof.
The technical scheme adopted by the invention is as follows:
a reinforced structure for pipe jacking and withdrawing comprises an open drainage ditch, a sedimentation tank, a high-pressure jet grouting pile, a waterproof curtain, a dewatering well and a pipe jacking and withdrawing reinforced mechanism;
the drainage open trench is arranged on the outer side of a construction road and a working well;
the sedimentation tank is arranged beside the jacking pipe of the working well;
the high-pressure jet grouting piles are arranged on two sides of the opening of the working well and are arranged along the jacking direction of the jacking pipe;
two groups of waterproof curtains are arranged on the outer sides of the high-pressure jet grouting piles respectively;
two groups of dewatering wells are arranged on two sides of the opening of the working well respectively and arranged along the jacking direction of the jacking pipe;
the jacking pipe back-jacking and withdrawing reinforcing mechanism is arranged in the working well, so that the jacking pipe can be reversely jacked and withdrawn conveniently.
According to the scheme, the jacking pipe back-jacking and withdrawing reinforcement mechanism comprises a back backrest, an oil cylinder frame, a back rest channel steel reaction frame, a main jacking oil cylinder, a main jacking channel steel reaction frame, a steel structure reaction frame, a reaction frame sleeve head and a support;
the rear backrest is fixed on the wall of a working well and is arranged behind the oil cylinder frame; the oil cylinder frame is connected with the back rest channel steel reaction frame;
two main jacking oil cylinders are arranged on the rear leaning channel steel reaction frame, the main jacking oil cylinders are connected with one ends of the main jacking channel steel reaction frames, and the other ends of the main jacking channel steel reaction frames are connected with supporting cushion blocks arranged on the well wall of the working well; a water stop rubber plate is arranged between the supporting cushion block and the top pipe;
one end of the steel structure reaction frame is connected with a reaction frame sleeve head arranged on the back rest channel steel reaction frame; the other end of the connecting rod penetrates through the jacking pipe and then is connected with a support on the heading machine head.
According to the scheme, the guide rail is arranged between the back channel steel reaction frame and the wall of the working well, the jacking pipe is arranged on the guide rail, and when the jacking pipe retreats, the jacking pipe can slide along the guide rail.
According to the scheme, the main jacking oil cylinder is connected with the main jacking channel steel reaction frame through the main jacking support base plate.
According to the scheme, one end of the jacking pipe, which is arranged in the working well, is provided with annular jacking iron;
the back rest channel steel reaction frame is provided with a support rod, and one end of the support rod extends into the ejector pipe to support and guide the ejector pipe.
According to the scheme, the reinforcement length of the high-pressure jet grouting pile along the jacking direction = the length of a pipe jacking machine plus the length of one section of pipeline, the reinforcement width is 3.5-4.5m respectively at two sides of the axis of the pipe jacking, and the reinforcement depth is 10-14m.
According to the scheme, the waterproof curtain comprises a first U-shaped channel steel with a plurality of upward notches and a second U-shaped channel steel with a plurality of downward notches, the first U-shaped channel steel and the second U-shaped channel steel are arranged at intervals, and two side plates of the first U-shaped channel steel respectively extend into 2 adjacent second U-shaped channel steels.
According to the scheme, the waterproof curtain is 5-7 m away from the high-pressure jet grouting pile.
The invention also provides a construction method for the pipe jacking and withdrawing reinforced structure, which comprises the following steps:
1) Arranging a drainage open trench along the construction road and the outer side of the working well;
2) Arranging a sedimentation tank beside a working well jacking pipe;
3) After accessories which cannot be soaked with water are removed, reserving 1m of a machine head in a hole of the working well, and then arranging high-pressure jet grouting piles on two sides of the hole of the working well along the jacking direction of a jacking pipe;
4) Arranging a waterproof curtain outside the high-pressure jet grouting pile;
5) Arranging dewatering wells on two sides of the opening of the working well and along the jacking direction of the jacking pipe;
6) Installing a pipe jacking and back-jacking and withdrawing reinforcing mechanism;
7) And (4) reversely jacking the pipe by the tunneling machine, and withdrawing the pipe jacking from the working well.
According to the scheme, the jacking pipe back-jacking and withdrawing reinforcing mechanism comprises a back backrest, an oil cylinder frame, a back channel steel reaction frame, a main jacking oil cylinder, a main jacking channel steel reaction frame, a steel structure reaction frame, a reaction frame sleeve head and a support;
the rear backrest is fixed on the wall of a working well and is arranged behind the oil cylinder frame; the oil cylinder frame is connected with the back channel steel reaction frame;
two main jacking oil cylinders are arranged on the rear leaning channel steel reaction frame, the main jacking oil cylinders are connected with one end of the main jacking channel steel reaction frame through main jacking support cushion plates, and the other end of the main jacking channel steel reaction frame is connected with support cushion blocks arranged on the wall of a working well; a water stop rubber plate is arranged between the supporting cushion block and the top pipe; a guide rail is arranged between the rear-leaning channel steel reaction frame and the wall of the working well, the jacking pipe is arranged on the guide rail, and when the jacking pipe retreats, the jacking pipe can slide along the guide rail;
one end of the steel structure reaction frame is connected with a reaction frame sleeve head arranged on the back rest channel steel reaction frame; the other end of the support passes through the jacking pipe and is connected with a support on the head of the development machine; one end of the jacking pipe, which is arranged in the working well, is provided with an annular jacking iron; the back rest channel steel reaction frame is provided with a support rod, and one end of the support rod extends into the ejector pipe to support and guide the ejector pipe.
According to the scheme, in the back jacking process, a certain amount of anti-drag slurry is injected between the jacking pipe and the soil body through the grouting annular pipe.
According to the scheme, the mud is uniformly filled in the gap between the pipeline and the surrounding soil body by adopting multi-point symmetrical pressure injection.
The invention has the beneficial effects that:
through the high-pressure jet grouting pile, a reinforcing and reinforcing area is formed above the top pipe opening, and the soil layer on the upper part of the opening can be effectively prevented from collapsing when the top pipe is jacked back;
by arranging the waterproof curtain, the reinforcing area of the opening can be enlarged along the jacking direction of the jacking pipe, so that a large amount of water gushing at the opening when the jacking pipe is jacked back is effectively prevented;
the main jacking channel steel reaction frame is supported on the wall of a working well through a connecting support base plate and is used for supporting pressure when the main jacking oil cylinder backs to jack;
the main jacking oil cylinders are placed on the oil cylinder frame so as to enable the two main jacking oil cylinders to be parallel to the axis, and further, an oil way is controlled so as to enable the two main jacking oil cylinders to act synchronously;
the main top supporting base plate is adopted to support the main top oil cylinder and is connected with a main top channel steel reaction frame, so that the main top oil cylinder is firmer when being jacked back;
the steel structure reaction frame is fixed by adopting the reaction frame sleeve head, so that the steel structure reaction frame is not easy to fall off when the main jacking oil cylinder backs up;
the back rest is adopted to bear the counterforce when the oil cylinder is jacked in and evenly transmit the counterforce to the working well wall, so that the cracking of the well wall due to uneven stress can be avoided;
and a certain amount of anti-drag slurry is injected to the outer wall of the joint through the grouting ring pipe in a pressing way, so that the frictional resistance between the pipeline and the soil body is reduced, and the effect of reducing the back-jacking resistance is achieved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic structural view of an open drain;
FIG. 2 is a schematic plan view of a three-stage sedimentation tank;
FIG. 3 is a schematic cross-sectional view taken along line I-I of FIG. 2;
FIG. 4 is a schematic view of the installation of a high pressure jet grouting pile;
FIG. 5 is a schematic view showing the installation of a waterproof curtain;
FIG. 6 is an installation schematic diagram of dewatering well;
FIG. 7 is a schematic structural view of the pipe jacking and withdrawing reinforcement mechanism;
in the figure: 1. the device comprises a working well, 2, a drainage open ditch, 3, a three-level sedimentation tank, 4, a water inlet tank, 5, a sedimentation filter tank, 6, a clear water outlet tank, 7, a concrete bottom plate, 8, a concrete cover plate, 9, a brick wall, 10, a high-pressure jet grouting pile, 11, a water-stop curtain, 12, a first U-shaped channel steel, 13, a second U-shaped channel steel, 14, a precipitation well, 15, a rear backrest, 16, a cylinder frame, 17, a rear backrest channel steel reaction frame, 18, a main top cylinder, 19, a main top channel steel reaction frame, 20, a steel structure reaction frame, 21, a reaction frame sleeve head, 22, a top pipe, 23, a support, 24, a support cushion plate, 25, a water-stop rubber plate, 26, a main top support cushion plate, 27, a guide rail, 28, an annular top iron, 29, a heading machine, 30, a working well wall, 31, a support rod, 32 and an in-well drainage ditch.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
Referring to fig. 1-7, a structure for pipe-jacking and withdrawing reinforcement comprises an open drainage ditch 2, a three-level sedimentation tank 3, a high-pressure jet grouting pile 10, a waterproof curtain 11, a dewatering well 14 and a pipe-jacking and withdrawing reinforcement mechanism.
The open drain 2 is 30cm wide and 30cm deep and is arranged on the outer side of a construction road and a working well.
The third-stage sedimentation tank 3 is arranged beside a top pipe 22 of the working well 1 and comprises a water inlet tank 4, a sedimentation filter tank 5, a clear water outlet tank 6 and a water inlet port at the top of the water inlet tank 4, wherein the water inlet tank 4, the sedimentation filter tank 5 and the clear water outlet tank 6 are enclosed by a concrete bottom plate 7, a concrete cover plate 8 and a brick wall 9, and water enters from the inlet port at the top of the water inlet tank 4, flows into the sedimentation filter tank 5 through an inlet port at the top of the sedimentation filter tank 5, flows into the clear water outlet tank 6 through an inlet port at the top of the clear water outlet tank 6 and is finally discharged through an outlet port of the clear water outlet tank 6.
Two rows of high-pressure jet grouting piles 10 are respectively arranged on two sides of the opening of the working well 1 and arranged along the jacking direction of the jacking pipe 22; the high-pressure jet grouting pile 10 is phi 600@150, the reinforcing length (along the jacking direction) is 8.2m, the reinforcing width ranges from 4m to 4m on each side of the axis of the jacking pipe, and the reinforcing depth is 12m.
Two groups of waterproof curtains 11 are respectively arranged at the outer sides of the high-pressure jet grouting piles 10, and the reinforcing width ranges are 10m on each side of the axis of the jacking pipe; it includes first U-shaped channel-section steel 12 and the second U-shaped channel-section steel 13 that a plurality of notches are decurrent that a plurality of notches are up, and first U-shaped channel-section steel 12 and the interval setting of second U-shaped channel-section steel 13, and two curb plates of first U-shaped channel-section steel 12 stretch into respectively in adjacent 2 second U-shaped channel-section steels 13, form the structure of buckleing mutually.
The dewatering wells 14 are divided into two groups, which are respectively arranged at two sides of the hole of the working well 1 and are arranged at intervals of 15m along the jacking direction, and the well depth is 24m.
The jacking pipe back-jacking and withdrawing reinforcing mechanism is arranged in a working well, is convenient for jacking and withdrawing in a reverse direction, and comprises a back backrest 15, an oil cylinder frame 16, a back rest channel steel reaction frame 17, a main jacking oil cylinder 18, a main jacking channel steel reaction frame 19, a steel structure reaction frame 20, a reaction frame sleeve head 21 and a support 23. The back rest 15 is fixed on the wall 30 of the working well and is arranged behind the oil cylinder frame 16, and the oil cylinder frame 16 is connected with the back rest channel steel reaction frame 17. Two main jacking oil cylinders 18 are arranged on the back channel steel reaction frame 17, the main jacking oil cylinders 18 are connected with one ends of main jacking channel steel reaction frames 19 through main jacking support base plates 26, and the other ends of the main jacking channel steel reaction frames 19 are connected with support cushion blocks 24 arranged on a working well wall 30; a water stop rubber plate 25 is arranged between the supporting cushion block 24 and the top pipe 22; a guide rail 27 is arranged between the reclining channel steel reaction frame 17 and the working well wall 30, the top pipe 22 is arranged on the guide rail 27, and when the top pipe 22 retracts, the top pipe 22 can slide along the guide rail. One end of the steel structure reaction frame 20 is connected with a reaction frame sleeve head 21 arranged on the back rest channel steel reaction frame 17; the other end of the connecting rod passes through the top pipe 22 and then is connected with a support 23 on the head of a heading machine 29; one end of the jacking pipe 22 arranged in the working well 1 is provided with an annular jacking iron 28; the rear channel steel reaction frame 17 is provided with a support rod 31, one end of the support rod 31 extends into the top pipe 22, and the support rod plays a role in supporting and guiding the retraction of the top pipe 22.
Example 2
A construction method for jacking and withdrawing a reinforced structure comprises the following steps:
1) Arranging a drainage open ditch with the width of 30cm and the depth of 30cm along the construction road and the outer side of the working well, arranging a water collecting well every 50m, wherein the gradient of the drainage ditch is 1 percent, and the drainage ditch needs to be regularly cleared by people and kept smooth; the drainage ditch is provided with a cast iron grate at the position where the drainage ditch passes through the road surface;
2) Arranging the three-stage sedimentation tank in the embodiment 1 beside a top pipe of the working well, wherein the plane size of the sedimentation tank is 10m × 2m, the thicknesses of a bottom plate, a tank wall and an isolation wall are 200mm, discharging drainage water from the top pipe during construction into the three-stage sedimentation tank for sedimentation, and discharging the drainage water into a municipal pipe network after the water quality test is qualified;
3) After accessories (a motor, a power box and the like of a pipe jacking machine) which cannot be soaked in water are removed, reserving 1m of a machine head in a hole of a working well, then enabling the water level in the working well to return to the underground water level, starting to construct a high-pressure jet grouting pile after the water level at the side of the hole 2 is balanced, and ensuring that the high-pressure jet grouting pile is constructed in a static water level state;
arranging a plurality of phi 600@150 high-pressure jet grouting piles on two sides (one side) of an opening of a working well along the jacking direction of a jacking pipe to enlarge the reinforcing range of the opening (two rows of high-pressure jet grouting piles are respectively positioned on two sides of the jacking pipe); the reinforcing length (considering the sum of the length (5.7 m) of a pipe jacking machine and the length (2.5 m) of a section of pipeline) of 8.2m formed by the phi 600@150 high-pressure jet grouting piles, the reinforcing width range is 4m on each side of the axis of the pipe jacking, the reinforcing depth is 12m, and the soil layer on the upper part of the opening can be effectively prevented from collapsing when the pipe jacking returns to the top;
4) Arranging waterproof curtains outside the high-pressure jet grouting piles, namely arranging two rows of waterproof curtains in embodiment 1 at the positions, which are 10m larger than the two sides of the hole, of the two sides of the hole along the jacking direction of the jacking pipe, so as to enlarge the hole reinforcing area and effectively prevent a large amount of water gushing from the hole when the jacking pipe jacks back; the waterproof curtain is made of 24# channel steel;
5) Dewatering wells are respectively arranged on two sides of the opening of a working well (an initial well) and 10m away from two sides of a jacking axis along the jacking direction of a jacking pipe; the interval between every two adjacent precipitation wells is 15m, 4 precipitation wells are arranged at the same side, the well depth is 24m, the precipitation wells are started in due time according to the actual field condition to reduce the underground water pressure, and a large amount of silt and underground water are prevented from flowing into a working well when a high-pressure jet grouting pile for reinforcing a hole opening is damaged when the pipe jacking equipment starts to leave the hole;
6) Installing the top pipe back jacking and exiting reinforcing mechanism in the embodiment 1;
7) And (4) reversely jacking the pipe by the tunneling machine, and withdrawing the pipe jacking from the working well.
In the embodiment, in the back jacking process, a certain amount of anti-drag slurry is symmetrically injected between the jacking pipe and the soil body in a multipoint manner through the grouting ring pipe, so that the slurry is uniformly filled in gaps between the pipeline and the surrounding soil body, the frictional resistance between the jacking pipe and the soil body is reduced, and the effect of reducing the back jacking resistance is achieved. The slurry comprises the following components in percentage by weight: and (3) bentonite: 50kg, soda ash: 5kg of CMC:1.2kg, water: 550kg.
The main jacking oil cylinder 18 works to drive the oil cylinder frame 16 to move backwards, further drive the steel structure reaction frame 20 to move backwards, and jacking pipes are retracted under the action of the steel structure reaction frame 20.
In this embodiment, at the entry driving machine aircraft nose with 2 supports of shaped steel welding to the fixed steel construction reaction frame that adopts the channel-section steel to make. The guide rail is formed by welding profile steel and steel plates, the strength and rigidity of the guide rail are ensured, and the jacking pipe is placed on the guide rail and slides along the guide rail when retreating under the action of the main jacking oil cylinder. The main jacking channel steel reaction frame is supported on the wall of a working well through a supporting base plate, and the main jacking channel steel reaction frame is used for supporting pressure when a main jacking oil cylinder jacks back. The main jacking oil cylinder is placed on the oil cylinder frame, and the main jacking oil cylinder is installed to be parallel to the axis, so that an oil way is controlled, and the oil cylinders act synchronously. The reaction frame sleeve head is used for fixing the steel structure reaction frame, and can effectively prevent the steel structure reaction frame from falling off when the main jacking oil cylinder jacks back. The main top supporting base plate is used for supporting the main top oil cylinder and connecting a main top channel steel reaction frame, and aims to enable the main top oil cylinder to be firmer when being jacked back.
Because the working environment of the invention is a strong permeable layer, a water-stopping device such as a double-layer water-stopping rubber plate is adopted at the opening of the working well. If the local small gap is still leaked, the composite material such as an oil-immersed hemp rope and asbestos can be adopted for plugging.
In the embodiment, the size of the back rest is 2.0 multiplied by 2.0m, the back rest mainly bears the counter force generated when the main jacking oil cylinder is jacked in, and the counter force is uniformly transmitted to the wall of a working well, so that the wall of the well is prevented from cracking due to uneven stress. The rear backrest is perpendicular to the jacking axis when lofting and mounting are carried out according to the actual jacking axis, the mounting elevation deviation is not more than 10mm, and the horizontal deviation is not more than 10mm. And filling and tamping the gap between the positioned back backrest and the well wall by using plain concrete.
In the embodiment, the main jacking oil cylinder frame adopts a split mounting structure, and the height and plane installation errors are controlled within 5mm, so that the uniform stress of the main jacking oil cylinder is ensured. In order to improve the working environment in the pipeline, a composite ventilation measure can be adopted during construction, namely, the air is pressed into the machine head from the outside through a vortex fan and a 300mm colloid ventilation pipe, and the air is exhausted in the pipeline and in the well by an axial flow fan. An in-well drain 32 is provided in the work well.
In the embodiment, the annular jacking iron is arranged at the end head of the jacking pipe so as to ensure that the jacking pipe cannot crack or be damaged in the retraction process.
It will be appreciated that modifications and variations are possible to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.
Claims (10)
1. The utility model provides a be used for push pipe to return to top and withdraw from reinforced structure which characterized in that: comprises an open drainage ditch, a sedimentation tank, a high-pressure jet grouting pile, a waterproof curtain, a dewatering well and a top pipe back-jacking and withdrawing reinforcement mechanism;
the drainage open trench is arranged on the outer side of a construction road and a working well;
the sedimentation tank is arranged beside the jacking pipe of the working well;
the high-pressure jet grouting piles are arranged on two sides of the opening of the working well and are arranged along the jacking direction of the jacking pipe;
two groups of waterproof curtains are arranged on the outer sides of the high-pressure jet grouting piles respectively;
two groups of dewatering wells are arranged on two sides of the opening of the working well respectively and are arranged along the jacking direction of the jacking pipe;
the jacking pipe back-jacking and withdrawing reinforcing mechanism is arranged in the working well, so that the jacking pipe can be reversely jacked and withdrawn conveniently.
2. The reinforcement structure for push pipe roof-back exit according to claim 1, characterized in that: the pipe jacking and withdrawing reinforcing mechanism comprises a back backrest, an oil cylinder frame, a back rest channel steel reaction frame, a main jacking oil cylinder, a main jacking channel steel reaction frame, a steel structure reaction frame, a reaction frame sleeve head and a support;
the rear backrest is fixed on the wall of a working well and is arranged behind the oil cylinder frame; the oil cylinder frame is connected with the back channel steel reaction frame;
two main jacking oil cylinders are arranged on the rear leaning channel steel reaction frame, the main jacking oil cylinders are connected with one ends of the main jacking channel steel reaction frames, and the other ends of the main jacking channel steel reaction frames are connected with supporting cushion blocks arranged on the wall of a working well; a water stop rubber plate is arranged between the supporting cushion block and the top pipe;
one end of the steel structure reaction frame is connected with a reaction frame sleeve head arranged on the back rest channel steel reaction frame; the other end of the connecting rod penetrates through the jacking pipe and then is connected with a support on the heading machine head.
3. The structure for pipe jacking and back exiting reinforcement according to claim 2, wherein: a guide rail is arranged between the rear-leaning channel steel reaction frame and the wall of the working well, the jacking pipe is arranged on the guide rail, and when the jacking pipe retreats, the jacking pipe can slide along the guide rail.
4. The reinforcement structure for push pipe roof-back exit according to claim 2, characterized in that: the main jacking oil cylinder is connected with the main jacking channel steel reaction frame through a main jacking support base plate.
5. The structure for pipe jacking and back exiting reinforcement according to claim 2, wherein: one end of the jacking pipe, which is arranged in the working well, is provided with an annular jacking iron;
the back rest channel steel reaction frame is provided with a support rod, and one end of the support rod extends into the ejector pipe to support and guide the ejector pipe.
6. The reinforcement structure for push pipe roof-back exit according to claim 1, characterized in that: the reinforcement length of the high-pressure jet grouting pile along the jacking direction = the length of a pipe jacking machine plus the length of a section of pipeline, the reinforcement width is 3.5-4.5m respectively at two sides of the axis of the pipe jacking, and the reinforcement depth is 10-14m.
7. The reinforcement structure for push pipe roof-back exit according to claim 1, characterized in that: the waterproof curtain comprises a plurality of first U-shaped channel steel with upward notches and a plurality of second U-shaped channel steel with downward notches, the first U-shaped channel steel and the second U-shaped channel steel are arranged at intervals, and two side plates of the first U-shaped channel steel respectively extend into 2 adjacent second U-shaped channel steel.
8. The reinforcement structure for pipe jacking and back-out according to claim 1 or 7, wherein: the waterproof curtain is 5-7 m away from the high-pressure jet grouting pile.
9. A construction method for jacking pipe back to back and exiting reinforced structure is characterized by comprising the following steps:
1) Arranging a drainage open trench along the construction road and the outer side of the working well;
2) Arranging a sedimentation tank beside a working well jacking pipe;
3) After accessories which cannot be soaked in water are removed, reserving 1m of machine head in a hole of a working well, and then arranging high-pressure jet grouting piles on two sides of the hole of the working well along the jacking direction of a jacking pipe;
4) Arranging a waterproof curtain outside the high-pressure jet grouting pile;
5) Arranging dewatering wells on two sides of the opening of the working well and along the jacking direction of the jacking pipe;
6) Installing a pipe jacking and back-jacking and withdrawing reinforcing mechanism;
7) And (4) reversely jacking the pipe by the tunneling machine, and withdrawing the pipe jacking from the working well.
10. The construction method for the pipe-jacking and back-exiting reinforced structure as claimed in claim 9, wherein:
the pipe jacking and withdrawing reinforcing mechanism comprises a back backrest, an oil cylinder frame, a back rest channel steel reaction frame, a main jacking oil cylinder, a main jacking channel steel reaction frame, a steel structure reaction frame, a reaction frame sleeve head and a support;
the rear backrest is fixed on the wall of a working well and is arranged behind the oil cylinder frame; the oil cylinder frame is connected with the back rest channel steel reaction frame;
two main jacking oil cylinders are arranged on the rear leaning channel steel reaction frame, the main jacking oil cylinders are connected with one end of the main jacking channel steel reaction frame through main jacking support cushion plates, and the other end of the main jacking channel steel reaction frame is connected with a support cushion block arranged on a working well wall; a water stop rubber plate is arranged between the supporting cushion block and the top pipe; a guide rail is arranged between the rear leaning channel steel reaction frame and the wall of the working well, the jacking pipe is arranged on the guide rail, and when the jacking pipe retreats, the jacking pipe can slide along the guide rail;
one end of the steel structure reaction frame is connected with a reaction frame sleeve head arranged on the back rest channel steel reaction frame; the other end of the support passes through the jacking pipe and then is connected with a support on the head of the tunneling machine; one end of the jacking pipe, which is arranged in the working well, is provided with an annular jacking iron; the back rest channel steel reaction frame is provided with a support rod, and one end of the support rod extends into the ejector pipe to support and guide the ejector pipe.
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| CN202210872656.7A CN115288113A (en) | 2022-07-20 | 2022-07-20 | Reinforced structure for jacking and withdrawing of jacking pipe and construction method thereof |
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Application publication date: 20221104 |