CN113356862A - Full-automatic mud-water balanced type pipe jacking construction method based on built-in light target real-time dynamic control - Google Patents
Full-automatic mud-water balanced type pipe jacking construction method based on built-in light target real-time dynamic control Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/003—Arrangement of measuring or indicating devices for use during driving of tunnels, e.g. for guiding machines
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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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/11—Lining shafts; Linings therefor with combinations of different materials, e.g. wood, metal, concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D5/00—Lining shafts; Linings therefor
- E21D5/12—Accessories for making shaft linings, e.g. suspended cradles, shutterings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/005—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries by forcing prefabricated elements through the ground, e.g. by pushing lining from an access pit
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
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Abstract
The invention relates to the technical field of municipal engineering pipe jacking excavation, in particular to a full-automatic mud-water balanced type pipe jacking construction method based on built-in light targets real-time dynamic control, wherein a heading machine is started to rotate and is pushed forwards by a jack, after the heading machine completely enters a soil layer, a cable and a mud pipe on the heading machine are dismantled, and a section of pushing pipe is hung in and installed at the tail part of the heading machine; starting the tunneling machine, using a jack to push the jacking pipe forwards, measuring the position parameters of the tunneling machine and the jacking pipe through a laser target and a laser theodolite, transmitting the measured original data to a control console, calculating the space attitude, and adjusting the attitude of the head of the tunneling machine. The invention uses muddy water pressure to balance the pressure of underground water, thereby avoiding the operation of hanging soil, carrying earthwork and the like which are easy to cause safety accidents; meanwhile, the soil pressure of a soil layer where the tunneling machine is located is balanced, and in the process of pipe-jacking tunneling, tunneling guide control is carried out through built-in light target laser positioning, so that the precision is improved.
Description
Technical Field
The invention relates to the technical field of municipal engineering push pipe excavation, in particular to a full-automatic mud-water balanced type push pipe construction method based on built-in light targets and real-time dynamic control.
Background
Along with the construction process of modern cities which is different day by day, when the environment is treated and the problems of water supply, power supply and the like are solved for facility matching construction, a grooving and pipe burying method is usually adopted for engineering construction. On the bustling streets in urban areas, around urban arterial roads in cities and on the main lines of high-grade roads just built, a plurality of pipe groove excavation scenes surrounding safety fences and working day and night can be seen. In a construction section, a brand-new building is dismantled, vehicles pass by at a limited speed, deep excavation causes different degrees of settlement of surrounding buildings, and the repaired road surface is still collapsed after several years. All of which are increasingly appreciated by people. In recent years, when a pipeline passes through a highway trunk line, although an artificial pipe-jacking construction method is adopted, the extrusion type short-distance pipe-jacking construction causes road surface uplift, and road surface collapse caused by artificial excavation type pipe jacking sometimes occurs.
Disclosure of Invention
The invention provides a full-automatic slurry balance type pipe jacking construction method based on built-in light targets real-time dynamic control, which balances the pressure of underground water by using slurry pressure, and avoids the operation of lifting soil, carrying earthwork and the like which are easy to cause safety accidents; meanwhile, the soil pressure of a soil layer where the tunneling machine is located is balanced, and in the process of pipe-jacking tunneling, tunneling guide control is carried out through built-in light target laser positioning, so that the precision is improved.
The invention relates to a full-automatic mud-water balanced type pipe jacking construction method based on built-in light targets real-time dynamic control, which comprises the following steps of:
step 1, measuring guide points, respectively excavating a working well and a receiving well, installing a heading machine in the working well, arranging a laser target in a machine head of the heading machine, and installing a laser theodolite in the working well;
step 2, starting the tunneling machine to rotate and pushing forwards by using a jack, removing a cable and a mud pipe on the tunneling machine after the tunneling machine completely enters a soil layer, hoisting a section of pushing pipe and installing the pushing pipe at the tail part of the tunneling machine;
step 3, starting the tunneling machine, using a jack to push the jacking pipe forwards, measuring position parameters of the tunneling machine and the jacking pipe through a laser target and a laser theodolite, transmitting the measured original data to a control console, calculating a space attitude, adjusting the attitude of a machine head of the tunneling machine, and stopping the operation of the tunneling machine and the jacking of the jack after the jacking pipe is pushed into the soil to a preset position;
step 4, hoisting the next jacking pipe into the working well, installing and connecting the next jacking pipe behind the previous jacking pipe, starting the tunneling machine and jacking and pushing the jacking pipe forwards by using a jack;
and 5, repeating the steps 3-4 until the jacking pipe is jacked to the receiving well.
The invention has the advantage of rapid deviation correction in the tunneling process. In the tunneling process of the tunneling machine, a laser guide control system is adopted, so that an operator can quickly make deviation correction treatment according to the deviation condition of a tunneling line displayed by a computer of a tunneling system at any time. And the tunneling guide control is accurate. In the whole tunneling process, the deviation precision of the whole pipeline in the horizontal and vertical directions within 5cm can be controlled by utilizing the laser positioning of the built-in light target.
Preferably, the method for measuring and paying off the laser theodolite in the step 1 comprises the following steps: guiding the centers of reserved holes of the working well and the receiving pit to respective pit walls by using an intersection method, arranging a laser theodolite to a point A of the working well pit wall, and making extension lines of straight lines of the point B and the point A according to a point B of the receiving well pit wall, and defining a point C at the rear part of the working well; ensuring that the point C, the point A and the point B are on one axis, arranging a theodolite on the point C, and looking back at the point A; a fixed laser theodolite frame is leveled, a theodolite is arranged at a point A, a point B is viewed from the back, a point D is defined on a placing frame of the laser theodolite, the point D is in a straight line with the point A and the point B in the vertical direction, the laser theodolite is arranged on the placing frame, the point D is centered, the point A is viewed from the back, an angle is formed according to a design axis, and an axis can be defined. The measuring and setting-out method ensures the accuracy of the center and the level point used by the pipe-jacking working well.
Preferably, after the heading machine completely enters the soil layer in the step 2, the method further comprises the following steps: pouring a front water stop wall made of plain concrete into a pit with the jacking pipe jacking in front, wherein the width of the front water stop wall is 2.0-5.0 m, the thickness of the front water stop wall is 0.3-0.5 m, and the height of the front water stop wall is 1.5-4.5 m; and then installing a rubber water stop ring in the reserved hole of the front water stop wall, wherein the rubber water stop ring consists of a concrete front water stop wall, an embedded bolt, a steel compression ring and a rubber ring. In the pipe jacking process, no matter whether the pipe goes out of the working well or enters the receiving pit, a certain gap is required to be reserved between the pipe and the hole. If the gap is not sealed, underground water and silt can flow into the working well from the gap, so that the ground surface at the upper part of the opening is collapsed, the water stopping structure avoids safety accidents, and the safety of surrounding buildings and underground pipelines is ensured.
Preferably, the working well is manufactured by the following steps: a. paying off and positioning; b. excavating a first section of earthwork; c. measurement control; d. binding the retaining wall reinforcing steel bars, adopting double-layer bidirectional arrangement, and reserving the lapping length of the lower retaining wall reinforcing steel bars; e. installing a retaining wall template by adopting a single-side wood template and supporting by using a steel pipe; f. pouring concrete, wherein the mark is C30, and the slump is controlled to be 5-7 cm; g. detecting whether the elevation reaches the standard, if so, entering the next step, and if not, returning to the step b; h. backfilling with C20 concrete.
The pipe-jacking working well is the place where pipe-jacking work activities are most concentrated, is a key part for jacking a pipeline, and the structural form of the working well is of great importance for improving the jacking quality of the pipeline and ensuring the construction safety. The project adopts a method of excavating by a segmented manual reverse construction method and supporting the reinforced concrete dado in a layered mode to construct the pipe-jacking working well and the receiving well, so that the stability and the reliability of the working well in the working process are ensured.
Preferably, the method also comprises the steps of crushing excavated soil blocks, mixing the crushed soil blocks with slurry, conveying the mixture to the ground through a sludge discharge pipe by a sludge discharge pump, and conveying water into the head of the development machine by a water inlet pump. Excavated soil, stones and the like are crushed in the rotating cutter head, then enter the slurry tank, are mixed with slurry therein, and finally are conveyed to the ground by the slurry pump through the slurry discharge pipe of the slurry system. In the excavation process, a complex mud-water balance device is adopted to maintain water and soil balance so as to be always between active soil pressure and passive soil pressure, and the effect of eliminating the settlement and the uplift of the ground is achieved. The soil property range applicable to the invention is wider, for example, the soil property range can be applicable to the conditions of very high underground water pressure and large variation range; the stability of the excavation surface can be effectively kept, and the disturbance to the soil around the top pipe is small; compared with other types of jacking pipes, the muddy water jacking pipe has smaller total thrust during construction, and is more prominent particularly in clay layers. Therefore, the pipe jacking device is suitable for long-distance pipe jacking; the working environment in the working well is better, and the operation is safer. Because it adopts muddy water pipeline to transport the spoil, there is not the operation that the safety accident easily takes place such as hanging soil, carrying earthwork. The air-pressure pipe jacking device can work under atmospheric pressure, and has no problems of various problems caused by the adoption of an air-pressure pipe jacking, endangering the health of operators and the like; the operation of conveying the spoil by muddy water is continuously carried out, so the progress of the operation is fast; the noise and the vibration are small, and the influence on the surrounding environment is small.
The slurry system of the present invention has two functions: the excavated dregs and the balance ground water are sent away. The mud system is composed of a sealed pipeline, forms a mud mixture through the circulation of a machine head, is conveyed away by a mud discharging pipe and finally settles in a mud pool on the ground, and the mud is discharged through a plurality of mud discharging pumps. Then the water is fed into the machine head by a water inlet pump, and the sludge discharge is controlled by a variable-speed sludge discharge pump. The pit bypass device can control the speed and the direction of the slurry inlet and outlet so as to prevent the sludge from blocking a pipeline and depositing on the site. When the clay is dug, the common clay has certain adhesion degree and can be directly discharged into a mud tank, but when the sand is dug, a certain adhesive (such as bentonite and the like) must be added into the mud to increase the viscosity of the mud so as to achieve the final purpose of slag discharge.
The mud system serves a second role: where groundwater is present, the pressure at the face of the roadheader may be reduced to less than the pressure in the water. This avoids the need to pump groundwater. Pressure sensors in the mud water supply and drainage system measure the pressure of the groundwater. The internal muddy water circulating system, the electromagnetic valve, the bypass device and the water carrying valve can play a role in regulating water pressure. The built-in electromagnetic valve and the bypass system can prevent the change of water pressure, keep the water pressure, and can not reduce the water pressure of the machine head when a pipeline is added, thereby ensuring the balance of internal pressure.
Preferably, in step 3: the laser theodolite emits laser beams, after the required elevation and direction positions are adjusted, the laser beams are aligned to a laser target in the tunneling machine, and the image of the laser target is captured in the image of the camera and is transmitted to a computer display screen of the console; and starting an oil cylinder arranged in the heading machine to stretch according to the calculation result of the measurement parameters, and adjusting the height of the head of the cutting part up, down, left and right to achieve the purpose of correcting the deviation. And the deviation rectification in the tunneling process is rapid. In the tunneling process of the tunneling machine, a laser guide control system is adopted, so that an operator can quickly make deviation correction treatment according to the deviation condition of a tunneling line displayed by a computer of a tunneling system at any time. And the tunneling guide control is accurate. In the whole tunneling process, the deviation precision of the whole pipeline in the horizontal and vertical directions within 5cm can be controlled by utilizing the laser positioning of the built-in light target.
And adjusting the deviation rectifying oil cylinder in time according to the laser point of the display screen of the console, so that the deviation rectifying oil cylinder can be continuously controlled within the axis range. The correction is carried out according to actual conditions and operating rules strictly, a report is given out, correction is carried out frequently, and each correction angle is kept to be 10 'to 20' and is not larger than 1 degree. The machine head is strictly controlled to greatly correct the deviation, so that the jacking is difficult and the pipe joint is cracked. When the river channel is crossed, the jacking speed is slowed down, and the grouting pressure is strictly controlled to prevent the river bed from being penetrated.
Preferably, the pushing jack of the heading machine is arranged on a back seat wall, the surface of the back seat wall is vertically arranged, the surface of the back seat wall is perpendicular to the axis of the jacking pipeline, the surface of the back seat wall is straight and perpendicular to the axis of the jacking pipeline, so that the situation that jacking force is lost and quality and safety accidents occur due to eccentric compression is avoided; the size of the rear seat wall is larger than 3m multiplied by 3m, the wall thickness is larger than 400mm, and the concrete grade is C30. The back seat wall is a structure that provides a reaction force for the jack when the pipe is jacked in, and is sometimes referred to as a back seat, a back or a back wall. In construction, the back seat wall is required to be stable, and once the back seat wall is damaged, the jacking project is stopped. The design of the rear seat wall needs to be calculated in detail, and the importance degree of the design is not inferior to the prediction calculation of the jacking force.
The invention has the beneficial effects that:
1. the soil property range of the soil is wide, and the soil property range can be applied under the conditions of high underground water pressure and wide variation range.
2. The stability of the excavation surface can be effectively kept, and the disturbance to the soil around the top pipe is small.
3. Compared with other types of jacking pipes, the muddy water jacking pipe has smaller total thrust during construction, and is more prominent particularly in clay layers. Therefore, the pipe jacking device is suitable for long-distance pipe jacking.
4. The working environment in the working well is better, and the operation is safer. Because it adopts muddy water pipeline to transport the spoil, there is not the operation that the safety accident easily takes place such as hanging soil, carrying earthwork. The air-pressure pipe jacking device can work under atmospheric pressure, and has no problems of various problems caused by the adoption of the air-pressure pipe jacking, endangering the health of operators and the like.
5. The operation of conveying the waste soil by muddy water is continuously carried out, so the progress of the operation is relatively fast.
6. The noise and the vibration are small, and the influence on the surrounding environment is small.
7. And the deviation rectification in the tunneling process is rapid. In the tunneling process of the tunneling machine, a laser guide control system is adopted, so that an operator can quickly make deviation correction treatment according to the deviation condition of a tunneling line displayed by a computer of a tunneling system at any time.
8. And the tunneling guide control is accurate. In the whole tunneling process, the deviation precision of the whole pipeline in the horizontal and vertical directions within 5cm can be controlled by utilizing the laser positioning of the built-in light target.
Drawings
FIG. 1 is a construction step diagram of a full-automatic mud-water balanced type pipe jacking construction method based on built-in light targets real-time dynamic control according to the invention.
FIG. 2 is a schematic view of a method of measuring payoff in accordance with the present invention.
Fig. 3 is a diagram illustrating the construction steps of the working well according to the present invention.
FIG. 4 is a drawing showing concrete construction steps in example 2 of the present invention
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example 1:
as shown in fig. 1, a full-automatic mud-water balanced type pipe jacking construction method based on built-in light targets real-time dynamic control comprises the following steps:
step 1, measuring guide points, respectively excavating a working well and a receiving well, installing a heading machine in the working well, arranging a laser target in a machine head of the heading machine, and installing a laser theodolite in the working well;
step 2, starting the tunneling machine to rotate and pushing forwards by using a jack, removing a cable and a mud pipe on the tunneling machine after the tunneling machine completely enters a soil layer, hoisting a section of pushing pipe and installing the pushing pipe at the tail part of the tunneling machine;
step 3, starting the tunneling machine, using a jack to push the jacking pipe forwards, measuring position parameters of the tunneling machine and the jacking pipe through a laser target and a laser theodolite, transmitting the measured original data to a control console, calculating a space attitude, adjusting the attitude of a machine head of the tunneling machine, and stopping the operation of the tunneling machine and the jacking of the jack after the jacking pipe is pushed into the soil to a preset position;
step 4, hoisting the next jacking pipe into the working well, installing and connecting the next jacking pipe behind the previous jacking pipe, starting the tunneling machine and jacking and pushing the jacking pipe forwards by using a jack;
and 5, repeating the steps 3-4 until the jacking pipe is jacked to the receiving well.
By adopting the method and the device, the deviation correction in the tunneling process is rapid. In the tunneling process of the tunneling machine, a laser guide control system is adopted, so that an operator can quickly make deviation correction treatment according to the deviation condition of a tunneling line displayed by a computer of a tunneling system at any time. And the tunneling guide control is accurate. In the whole tunneling process, the deviation precision of the whole pipeline in the horizontal and vertical directions within 5cm can be controlled by utilizing the laser positioning of the built-in light target.
Example 2:
as shown in FIG. 4, the full-automatic mud-water balanced type pipe jacking construction method based on the real-time dynamic control of the built-in light target comprises the following steps:
step 1, measuring guide points, respectively excavating a working well and a receiving well, installing a heading machine in the working well, arranging a laser target in a machine head of the heading machine, and installing a laser theodolite in the working well;
step 2, starting the tunneling machine to rotate and pushing forwards by using a jack, removing a cable and a mud pipe on the tunneling machine after the tunneling machine completely enters a soil layer, hoisting a section of pushing pipe and installing the pushing pipe at the tail part of the tunneling machine;
step 3, starting the tunneling machine, using a jack to push the jacking pipe forwards, measuring position parameters of the tunneling machine and the jacking pipe through a laser target and a laser theodolite, transmitting the measured original data to a control console, calculating a space attitude, adjusting the attitude of a machine head of the tunneling machine, and stopping the operation of the tunneling machine and the jacking of the jack after the jacking pipe is pushed into the soil to a preset position;
step 4, hoisting the next jacking pipe into the working well, installing and connecting the next jacking pipe behind the previous jacking pipe, starting the tunneling machine and jacking and pushing the jacking pipe forwards by using a jack;
and 5, repeating the steps 3-4 until the jacking pipe is jacked to the receiving well.
In the embodiment, the deviation rectification is rapid in the tunneling process, and the laser guide control system is adopted in the tunneling machine, so that an operator can rapidly make the deviation rectification treatment according to the deviation condition of the tunneling line displayed by a computer of the tunneling system at any time. And the tunneling guide control is accurate. In the whole tunneling process, the deviation precision of the whole pipeline in the horizontal and vertical directions within 5cm can be controlled by utilizing the laser positioning of the built-in light target.
As shown in fig. 2, in this embodiment, the method for surveying and setting out the laser theodolite in step 1 includes: guiding the centers of reserved holes of the working well and the receiving pit to respective pit walls by using an intersection method, arranging a laser theodolite to a point A of the working well pit wall, and making extension lines of straight lines of the point B and the point A according to a point B of the receiving well pit wall, and defining a point C at the rear part of the working well; ensuring that the point C, the point A and the point B are on one axis, arranging a theodolite on the point C, and looking back at the point A; a fixed laser theodolite frame is leveled, a theodolite is arranged at a point A, a point B is viewed from the back, a point D is defined on a placing frame of the laser theodolite, the point D is in a straight line with the point A and the point B in the vertical direction, the laser theodolite is arranged on the placing frame, the point D is centered, the point A is viewed from the back, an angle is formed according to a design axis, and an axis can be defined. The measuring and setting-out method ensures the accuracy of the center and the level point used by the pipe-jacking working well.
In this embodiment, after the heading machine completely enters the soil layer in step 2, the method further includes the following steps: pouring a front water stop wall made of plain concrete into a pit with the jacking pipe jacking in front, wherein the width of the front water stop wall is 2.0-5.0 m, the thickness of the front water stop wall is 0.3-0.5 m, and the height of the front water stop wall is 1.5-4.5 m; and then installing a rubber water stop ring in the reserved hole of the front water stop wall, wherein the rubber water stop ring consists of a concrete front water stop wall, an embedded bolt, a steel compression ring and a rubber ring. In the pipe jacking process, no matter whether the pipe goes out of the working well or enters the receiving pit, a certain gap is required to be reserved between the pipe and the hole. If the gap is not sealed, underground water and silt can flow into the working well from the gap, so that the ground surface at the upper part of the opening is collapsed, the water stopping structure avoids safety accidents, and the safety of surrounding buildings and underground pipelines is ensured.
As shown in fig. 3, in this embodiment, the manufacturing process of the working well includes: a. paying off and positioning; b. excavating a first section of earthwork; c. measurement control; d. binding the retaining wall reinforcing steel bars, adopting double-layer bidirectional arrangement, and reserving the lapping length of the lower retaining wall reinforcing steel bars; e. installing a retaining wall template by adopting a single-side wood template and supporting by using a steel pipe; f. pouring concrete, wherein the mark is C30, and the slump is controlled to be 5-7 cm; g. detecting whether the elevation reaches the standard, if so, entering the next step, and if not, returning to the step b; h. backfilling with C20 concrete.
The working well for jacking the pipe is the most concentrated place for the work activities of jacking pipes and is a key part for jacking the pipeline, and the structural form of the working well is of great importance for improving the jacking quality of the pipeline and ensuring the construction safety. The project adopts a method of excavating by a segmented manual reverse construction method and supporting the reinforced concrete dado in a layered mode to construct the pipe-jacking working well and the receiving well, so that the stability and the reliability of the working well in the working process are ensured.
In the embodiment, the method further comprises the steps of crushing the excavated soil blocks, mixing the crushed soil blocks with slurry, conveying the mixture to the ground through a sludge discharge pipe by a sludge discharge pump, and conveying water into the head of the development machine by a water inlet pump. Excavated soil, stones and the like are crushed in the rotating cutter head, then enter the slurry tank, are mixed with slurry therein, and finally are conveyed to the ground by the slurry pump through the slurry discharge pipe of the slurry system. In the excavation process, a complex mud-water balance device is adopted to maintain water and soil balance so as to be always between active soil pressure and passive soil pressure, and the effect of eliminating the settlement and the uplift of the ground is achieved. The soil property range applicable to the invention is wider, for example, the soil property range can be applicable to the conditions of very high underground water pressure and large variation range; the stability of the excavation surface can be effectively kept, and the disturbance to the soil around the top pipe is small; compared with other types of jacking pipes, the muddy water jacking pipe has smaller total thrust during construction, and is more prominent particularly in clay layers. Therefore, the pipe jacking device is suitable for long-distance pipe jacking; the working environment in the working well is better, and the operation is safer. Because it adopts muddy water pipeline to transport the spoil, there is not the operation that the safety accident easily takes place such as hanging soil, carrying earthwork. The air-pressure pipe jacking device can work under atmospheric pressure, and has no problems of various problems caused by the adoption of an air-pressure pipe jacking, endangering the health of operators and the like; the operation of conveying the spoil by muddy water is continuously carried out, so the progress of the operation is fast; the noise and the vibration are small, and the influence on the surrounding environment is small.
The slurry system of the present invention has two functions: the excavated dregs and the balance ground water are sent away. The mud system is composed of a sealed pipeline, forms a mud mixture through the circulation of a machine head, is conveyed away by a mud discharging pipe and finally settles in a mud pool on the ground, and the mud is discharged through a plurality of mud discharging pumps. Then the water is fed into the machine head by a water inlet pump, and the sludge discharge is controlled by a variable-speed sludge discharge pump. The pit bypass device can control the speed and the direction of the slurry inlet and outlet so as to prevent the sludge from blocking a pipeline and depositing on the site. When the clay is dug, the common clay has certain adhesion degree and can be directly discharged into a mud tank, but when the sand is dug, a certain adhesive (such as bentonite and the like) must be added into the mud to increase the viscosity of the mud so as to achieve the final purpose of slag discharge.
The mud system serves a second role: where groundwater is present, the pressure at the face of the roadheader may be reduced to less than the pressure in the water. This avoids the need to pump groundwater. Pressure sensors in the mud water supply and drainage system measure the pressure of the groundwater. The internal muddy water circulating system, the electromagnetic valve, the bypass device and the water carrying valve can play a role in regulating water pressure. The built-in electromagnetic valve and the bypass system can prevent the change of water pressure, keep the water pressure, and can not reduce the water pressure of the machine head when a pipeline is added, thereby ensuring the balance of internal pressure.
In this embodiment, in step 3: the laser theodolite emits laser beams, after the required elevation and direction positions are adjusted, the laser beams are aligned to a laser target in the tunneling machine, and the image of the laser target is captured in the image of the camera and is transmitted to a computer display screen of the console; and starting an oil cylinder arranged in the heading machine to stretch according to the calculation result of the measurement parameters, and adjusting the height of the head of the cutting part up, down, left and right to achieve the purpose of correcting the deviation. And the deviation rectification in the tunneling process is rapid. In the tunneling process of the tunneling machine, a laser guide control system is adopted, so that an operator can quickly make deviation correction treatment according to the deviation condition of a tunneling line displayed by a computer of a tunneling system at any time. And the tunneling guide control is accurate. In the whole tunneling process, the deviation precision of the whole pipeline in the horizontal and vertical directions within 5cm can be controlled by utilizing the laser positioning of the built-in light target.
And adjusting the deviation rectifying oil cylinder in time according to the laser point of the display screen of the console, so that the deviation rectifying oil cylinder can be continuously controlled within the axis range. The correction is carried out according to actual conditions and operating rules strictly, a report is given out, correction is carried out frequently, and each correction angle is kept to be 10 'to 20' and is not larger than 1 degree. The machine head is strictly controlled to greatly correct the deviation, so that the jacking is difficult and the pipe joint is cracked. When the river channel is crossed, the jacking speed is slowed down, and the grouting pressure is strictly controlled to prevent the river bed from being penetrated.
In the embodiment, the allowable deviation and inspection method of the jacking pipe is as follows, wherein L in the table is the jacking distance of the pipeline and is calculated by the axial distance between two wells; in the table, D is the inner diameter of the pipeline; when the opposite vertex process is adopted under special conditions, the stagger of the opposite vertex two ends is not more than 50 mm.
In the embodiment, the allowable deviation and inspection method of the pipe jacking working well are as shown in the following table, wherein H is the vertical height of the back, and L is the horizontal length of the back.
In this embodiment, the jacking jack of the heading machine is arranged on a back seat wall, the surface of the back seat wall is vertically arranged, the surface of the back seat wall is perpendicular to the axis of the jacking pipeline, and the surface of the back seat wall is straight and perpendicular to the axis of the jacking pipeline, so that the situation that jacking force is lost and quality and safety accidents occur due to eccentric compression is avoided; the size of the rear seat wall is larger than 3m multiplied by 3m, the wall thickness is larger than 400mm, and the concrete grade is C30. The back seat wall is a structure that provides a reaction force for the jack when the pipe is jacked in, and is sometimes referred to as a back seat, a back or a back wall. In construction, the back seat wall is required to be stable, and once the back seat wall is damaged, the jacking project is stopped. The design of the rear seat wall needs to be calculated in detail, and the importance degree of the design is not inferior to the prediction calculation of the jacking force.
In this embodiment, the main construction equipment is as follows.
| Serial number | Device name | Number of |
| 1 | Muddy water balance tunnel boring machine (NSPO) | 1 table |
| 2 | Muddy water conveying (balancing) system | 1 set of |
| 3 | Main jacking device | 1 set of |
| 4 | Muddy water treatment system | 1 set of |
| 5 | Digging machine | 4 tables |
| 6 | Loading machine | 1 table |
| 7 | Pile driver | 1 table |
| 8 | Crane | 2 vehicle |
| 9 | Electric welding machine | 2 table |
| 10 | Submersible pump | 4 tables |
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. A full-automatic mud-water balanced type pipe jacking construction method based on built-in light targets real-time dynamic control is characterized by comprising the following steps:
step 1, measuring guide points, respectively excavating a working well and a receiving well, installing a heading machine in the working well, arranging a laser target in a machine head of the heading machine, and installing a laser theodolite in the working well;
step 2, starting the tunneling machine to rotate and pushing forwards by using a jack, removing a cable and a mud pipe on the tunneling machine after the tunneling machine completely enters a soil layer, hoisting a section of pushing pipe and installing the pushing pipe at the tail part of the tunneling machine;
step 3, starting the tunneling machine, using a jack to push the jacking pipe forwards, measuring position parameters of the tunneling machine and the jacking pipe through a laser target and a laser theodolite, transmitting the measured original data to a control console, calculating a space attitude, adjusting the attitude of a machine head of the tunneling machine, and stopping the operation of the tunneling machine and the jacking of the jack after the jacking pipe is pushed into the soil to a preset position;
step 4, hoisting the next jacking pipe into the working well, installing and connecting the next jacking pipe behind the previous jacking pipe, starting the tunneling machine and jacking and pushing the jacking pipe forwards by using a jack;
and 5, repeating the steps 3-4 until the jacking pipe is jacked to the receiving well.
2. The full-automatic mud-water balanced type pipe jacking construction method based on the built-in light target real-time dynamic control according to claim 1, characterized in that the measurement and paying-off method of the laser theodolite in the step 1 is as follows: guiding the centers of reserved holes of the working well and the receiving pit to respective pit walls by using an intersection method, arranging a laser theodolite to a point A of the working well pit wall, and making extension lines of straight lines of the point B and the point A according to a point B of the receiving well pit wall, and defining a point C at the rear part of the working well; ensuring that the point C, the point A and the point B are on one axis, arranging a theodolite on the point C, and looking back at the point A; a fixed laser theodolite frame is leveled, a theodolite is arranged at a point A, a point B is viewed from the back, a point D is defined on a placing frame of the laser theodolite, the point D is in a straight line with the point A and the point B in the vertical direction, the laser theodolite is arranged on the placing frame, the point D is centered, the point A is viewed from the back, an angle is formed according to a design axis, and an axis can be defined.
3. The full-automatic mud-water balanced type pipe jacking construction method based on the built-in light target real-time dynamic control as claimed in claim 1, wherein the method further comprises the following steps after the heading machine completely enters the soil layer in step 2: pouring a front water stop wall made of plain concrete into a pit with the jacking pipe jacking in front, wherein the width of the front water stop wall is 2.0-5.0 m, the thickness of the front water stop wall is 0.3-0.5 m, and the height of the front water stop wall is 1.5-4.5 m; and then installing a rubber water stop ring in the reserved hole of the front water stop wall, wherein the rubber water stop ring consists of a concrete front water stop wall, an embedded bolt, a steel compression ring and a rubber ring.
4. The full-automatic mud-water balanced type pipe jacking construction method based on the built-in light target real-time dynamic control according to claim 1, characterized in that the manufacturing process of the working well is as follows: a. paying off and positioning; b. excavating a first section of earthwork; c. measurement control; d. binding the retaining wall reinforcing steel bars, adopting double-layer bidirectional arrangement, and reserving the lapping length of the lower retaining wall reinforcing steel bars; e. installing a retaining wall template by adopting a single-side wood template and supporting by using a steel pipe; f. pouring concrete, wherein the mark is C30, and the slump is controlled to be 5-7 cm; g. detecting whether the elevation reaches the standard, if so, entering the next step, and if not, returning to the step b; h. backfilling with C20 concrete.
5. The full-automatic mud-water balanced type pipe jacking construction method based on the built-in light target real-time dynamic control as claimed in claim 1, wherein: the method also comprises the steps of crushing excavated soil blocks, mixing with slurry, conveying the mixture to the ground through a sludge discharge pipe by a sludge discharge pump, and conveying water into a machine head of the development machine by a water inlet pump.
6. The full-automatic mud-water balanced type pipe jacking construction method based on the built-in light target real-time dynamic control according to claim 1, characterized in that in step 3: the laser theodolite emits laser beams, after the required elevation and direction positions are adjusted, the laser beams are aligned to a laser target in the tunneling machine, and the image of the laser target is captured in the image of the camera and is transmitted to a computer display screen of the console; and starting an oil cylinder arranged in the heading machine to stretch according to the calculation result of the measurement parameters, and adjusting the height of the head of the cutting part up, down, left and right to achieve the purpose of correcting the deviation.
7. The full-automatic mud-water balanced type pipe jacking construction method based on the built-in light target real-time dynamic control as claimed in claim 1, wherein: the jacking jack of the heading machine is arranged on a back seat wall, the surface of the back seat wall is vertically arranged and is perpendicular to the axis of the jacking pipeline, the size of the back seat wall is larger than 3m multiplied by 3m, the wall thickness is larger than 400mm, and the concrete grade is C30.
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Cited By (1)
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| CN116857432A (en) * | 2023-06-21 | 2023-10-10 | 金中天水利建设有限公司 | Pipe jacking device and pipe jacking construction method thereof |
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