CN104482295A - Pressure equalization cabin of pipe-jacking machine head and application method thereof - Google Patents
Pressure equalization cabin of pipe-jacking machine head and application method thereof Download PDFInfo
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- CN104482295A CN104482295A CN201410666746.6A CN201410666746A CN104482295A CN 104482295 A CN104482295 A CN 104482295A CN 201410666746 A CN201410666746 A CN 201410666746A CN 104482295 A CN104482295 A CN 104482295A
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- material cabin
- work chamber
- pressure
- air
- hatch door
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/024—Laying or reclaiming pipes on land, e.g. above the ground
- F16L1/028—Laying or reclaiming pipes on land, e.g. above the ground in the ground
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
The invention discloses a pressure equalization cabin of pipe-jacking machine head and application method thereof; air in a material cabin and air in a working cabin are compressed successively, so that the air pressure is equal within the height range of the whole excavation working surface; the pressure of underground water has a gradient, so that a gas pressure zone with pressure of more than balance pressure is formed at the top of a tool pipe; water in the stratum clearance is extruded under the action of the pressure and the stratum changes from the original saturated state to a sub-saturated state, so that the excavation surface is balanced.
Description
Technical field
The present invention relates to construction project field, specifically refer to the equal ballasting of a kind of push pipe head and application process thereof.
Background technique
Push pipe is the driving of the no-dig technique for a municipal construction formula pipeline laying construction technology, and highway crossing, railway, river that can be safe, even can pass, effectively carry out environmental protection under building.Pipe-jacking technology construction, without the need to cutting off construction, is avoided the daily life of the normal movable and resident of the affecting traffic, destroy road surface, destroy surface vegetation of excavation construction, impact, and be there is a large amount of earthworks, shorten the construction period greatly.And different soil properties can be run in push pipe process, and relate to oil, natural gas line lay in sand, pipeline Crossing by Pipe Pushing Construction under quicksand geological condition, construct under this geological condition, jacking resistance and correction difficulty large.
In jacking construction, traditional anti-permeable, water-impervious measure are well-points dewatering, namely utilize well point to carry out gravity and catchment, and get rid of in well the object catchmenting to reach precipitation or reduce artesian pressure.But in work progress, particularly run into high permeable geology, easily occur that the surface water and underground water pour in dewatering well, when dewatering well water burst exceedes proper drainage ability by various passages such as crack, tomography, subsidence areas, just cause floods in well, bring very large potential safety hazard to jacking construction.
Summary of the invention
The object of the present invention is to provide the equal ballasting of a kind of push pipe head and application process thereof, utilize the free water in interstices of soil in the certain limit of air pressure drainage head front, avoid the instability that the soil body causes by seepage action of ground water effect, utilize the compressed-air actuated pressure support excavation face soil body simultaneously, make it to reach stable equilibrium.
Object of the present invention is achieved through the following technical solutions:
The equal ballasting of a kind of push pipe head, comprise equal ballasting body, work chamber and material cabin is provided with in described equal ballasting body, the side in material cabin is provided with the first hatch door, work chamber upper side is provided with the first hatch door towards the second identical hatch door, push pipe head is arranged in work chamber, is connected with breather line at the top in material cabin, and material cabin is communicated with extraneous air compressor with work chamber by this breather line respectively.The present invention adopts air pressure balance underground water, utilize outside air compressor by breather line respectively to the pressurized air being filled with certain pressure in work chamber and material cabin, utilize the free water in interstices of soil in the certain limit of air pressure drainage push pipe head front, avoid the instability that the soil body causes by seepage action of ground water effect on the one hand, utilize the compressed-air actuated pressure support excavation face soil body simultaneously, make it to reach stable equilibrium, staff is entered in work chamber by the first hatch door and the second hatch door and carries out jacking operation simultaneously; In the altitude range of whole driving face, the gas pressure of effect is equal, but the pressure of underground water has gradient, therefore just form at the top of cutting head the gas pressure district that exceedes balance pressure, under this pressure effect, water in formation void is extruded, stratum also from original saturation state excessively to semi-saturation state, thus play balance excavation surface effect.
Also comprise the cutting head being arranged on work chamber front end, be circumferentially hingedly connected with 4 groups of two-way working hydraulic jacks at described cutting head inwall.Rectifying device is two-way working hydraulic jack, be articulated and connected with cutting head inwall, along cutting head inwall circumference, 4 groups of hydraulic jacks are set altogether, expanding-contracting action and the extending amount of these 4 groups of hydraulic jacks can be controlled by external hydraulic system, the angle that adjustment cutting head goes up in the axial direction, thus reach the object controlling push pipe direction of advance.Compared with prior art, correction action more accurately, more controlled, and more easily to realize.
An application process for the equal ballasting of push pipe head, comprise the equal ballasting of push pipe head described in claim 1 or 2, its application process comprises the following steps:
A () closes the first hatch door, make work chamber and atmospheric isolation, in the complete hermetic situation of work chamber, to work chamber input compressed-air, underground water can not be gushed out and flow in material cabin, forms the operating environment without water security;
B () operating personnel enters material cabin, close the second hatch door, simultaneously to the input of material cabin and the pressurized air of work chamber with equal pressure;
C () then opens the first hatch door, after operating personnel enters work chamber, close the first hatch door, namely start excavation operation;
D () is after material cabin is filled, close the first hatch door, start to reduce pressure to material cabin, the second hatch door is opened when material cabin internal air pressure and ambient atmosphere pressure balanced, entrucking is carried out in the earthwork that the jacking place of excavation goes out by staff, transported outputting material cabin, until the earthwork is totally emptied in material cabin;
E () repeats above-mentioned steps (a) ~ (d).
The air demand Q of described step (a) continues supply, makes the maintain constant pressure in work chamber, and air demand Q meets
;
Wherein Q is air quantity (m required under normal pressure
3/ min), D is tool pipe diameter m; α is empirical value, and the α of silty clay is 0.5.
In described step (a), groundwater pressure meets
;
Wherein hw is level of ground water distance tool pipe bottom level,
for the unit weight of water.
The compressed-air actuated force value that described step (b) passes into
, and 0 ﹤ P≤0.36Mpa.
Head jacking operation in described step (d) in work chamber and the operation that fetches earth in material cabin are carried out simultaneously.
The present invention compared with prior art, has following advantage and beneficial effect:
The Security of constructing still can be ensured in the soil property situation that the present invention relatively can enrich at underground water, sand content is larger, meanwhile, less to soil layer disturbance in pipeline jack-in process, quantity precise control of being unearthed, the soil layer clamp-oning cabin is convenient to outward transport through cutting; And the present invention utilizes the free water in the certain limit of air pressure drainage head front in interstices of soil, avoid the instability that the soil body causes by seepage action of ground water effect on the one hand, utilize the compressed-air actuated pressure support excavation face soil body simultaneously, make to reach stable equilibrium between level of ground water and excavation surface.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide the further understanding to the embodiment of the present invention, forms a application's part, does not form the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of equal ballasting;
Fig. 2 is process principle figure of the present invention;
Mark and corresponding component title in accompanying drawing:
1-work chamber, 2-cutting head, 3-first hatch door, 4-material cabin, 5-second hatch door, 6-breather line.
Embodiment
Clearly understand for making the object, technical solutions and advantages of the present invention, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, and exemplary embodiment of the present invention and explanation thereof are only for explaining the present invention, not as a limitation of the invention.
Embodiment 1
As depicted in figs. 1 and 2, A is ground surface, B is level of ground water, C is equal ballasting body, equal ballasting in the present embodiment, comprise equal ballasting body, work chamber 1 and material cabin 4 is provided with in described equal ballasting body, the side in material cabin 4 is provided with the first hatch door 3, work chamber 1 upper side is provided with the first hatch door 3 towards the second identical hatch door 5, push pipe head is arranged in work chamber 1, is connected with breather line 6 at the top in material cabin 4, and material cabin 4 is communicated with extraneous air compressor with work chamber 1 by this breather line 6 respectively.The present invention adopts air pressure balance underground water, utilize outside air compressor by breather line 6 respectively to the pressurized air being filled with certain pressure in work chamber 1 and material cabin 4, utilize the free water in interstices of soil in the certain limit of air pressure drainage push pipe head front, avoid the instability that the soil body causes by seepage action of ground water effect on the one hand, utilize the compressed-air actuated pressure support excavation face soil body simultaneously, make it to reach stable equilibrium, staff is entered in work chamber 1 by the first hatch door 3 and the second hatch door 5 and carries out jacking operation simultaneously; In the altitude range of whole driving face, the gas pressure of effect is equal, but the pressure of underground water has gradient, therefore just form at the top of tool pipe 2 the gas pressure district that exceedes balance pressure, under this pressure effect, water in formation void is extruded, stratum also from original saturation state excessively to semi-saturation state, thus play balance excavation surface effect.
Described step (a)
;
Wherein Q is air quantity (m required under normal pressure
3/ min), D is tool pipe diameter m; α is empirical value, and the α of silty clay is 0.5.Air demand Q continues supply, and then ensure that the pressure in work chamber 1 does not decline, namely reach the number of dropouts of air in soil in work chamber 1 equal with the gas pushing quantity in breather line 6, and then the height of underground water level can not be declined, facilitate the jacking effect of push pipe head.
In described step (a), groundwater pressure meets
; Wherein hw is level of ground water distance tool pipe bottom level,
for the unit weight of water.
The compressed-air actuated force value that described step (b) passes into
, and 0 ﹤ P≤0.36Mpa.The groundwater pressure at excavation surface place can be determined according to the product of the capacity of the water of hw and this position, and by the compressed air pressure value injected in breather line is
.The discrepancy in elevation apart from level of ground water bottom cutting head 2 is maximum, and the hydraulic pressure that herein seeps water is also maximum; When theoretical air pressure is equal with the hydraulic pressure that seeps water bottom cutting head, the water in whole development end in soil just can not ooze out, but in order to increase counterbalance effect, acts on gas pressure on working surface generally slightly larger than maximum seepage pressure.
Head jacking operation in described step (d) in work chamber and the operation that fetches earth in material cabin 4 are carried out simultaneously, and the soil amount of head incision should be roughly equal with the soil amount of digging out, in head, the soil amount of incision is too much, will inevitably increase top power, the increase of top power may cause land upheaval or sedimentation by disturbed soil; Cut the earth in head too much, even dig beyond head forward position, although there is air pressure, but still excavation surface may be caused to cave in, make surface subsidence, push pipe is only under interfacial pressure and jacking and being unearthed and remaining on this dynamic balance state, and guarantee over the ground face rings minimum, push pipe is best in quality, and working efficiency is the highest.
Above-described embodiment; object of the present invention, technological scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the equal ballasting of push pipe head, comprise equal ballasting body, it is characterized in that: in described equal ballasting body, be provided with work chamber (1) and material cabin (4), the side in material cabin (4) is provided with the first hatch door (3), and work chamber (1) upper side is provided with the first hatch door (3) towards identical the second hatch door (5); Push pipe head is arranged in work chamber (1), is connected with air communicating pipe road (6) at the top of material cabin (4), and material cabin (4) are communicated with extraneous air compressor with work chamber (1) by this air communicating pipe road (6) respectively.
2. the equal ballasting of a kind of push pipe head according to claim 1, is characterized in that: also comprise the cutting head (2) being arranged on work chamber (1) front end, is circumferentially hingedly connected with 4 groups of two-way working hydraulic jacks at described cutting head (2) inwall.
3. an application process for the equal ballasting of push pipe head, is characterized in that: comprise the equal ballasting of push pipe head described in claim 1 or 2, its application process comprises the following steps:
A () closes the first hatch door (3), make work chamber (1) and atmospheric isolation, in the complete hermetic situation of work chamber (1), to work chamber (1) input compressed-air, underground water can not be gushed out and flow in material cabin (4), forming the operating environment without water security;
B () operating personnel enters material cabin (4), close the second hatch door (5), simultaneously to material cabin (4) input and the pressurized air of work chamber (1) with equal pressure;
C () then opens the first hatch door (3), after operating personnel enters work chamber (1), close the first hatch door (3), namely start jacking operation;
D () is after material cabin is filled, close the first hatch door (3), start to reduce pressure to material cabin (4), the second hatch door (5) is opened when material cabin (4) internal air pressure and ambient atmosphere pressure balanced, entrucking is carried out in the earthwork that the jacking place of excavation goes out by staff, transported outputting material cabin (4), until material cabin (4) the interior earthwork is totally emptied;
E () repeats above-mentioned steps (a) ~ (d).
4. the application process of the equal ballasting of a kind of push pipe head according to claim 3, is characterized in that: the air demand Q of described step (a) continues supply, makes the maintain constant pressure in work chamber (1), and air demand Q meets
;
Wherein Q is air quantity (m required under normal pressure
3/ min), D is tool pipe diameter m; α is empirical value.
5. the application process of the equal ballasting of a kind of push pipe head according to claim 3, is characterized in that: in described step (a), groundwater pressure meets
;
Wherein hw is level of ground water distance tool pipe bottom level,
for the unit weight of water.
6. the application process of the equal ballasting of a kind of push pipe head according to claim 3, is characterized in that, the compressed-air actuated force value that described step (b) passes into
, and 0 ﹤ P≤0.36Mpa.
7. the equal ballasting of a kind of push pipe head according to claim 3 and application process thereof, is characterized in that, the head jacking operation in described step (d) in work chamber (1) and the operation that fetches earth in material cabin (4) are carried out simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410666746.6A CN104482295A (en) | 2014-11-20 | 2014-11-20 | Pressure equalization cabin of pipe-jacking machine head and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410666746.6A CN104482295A (en) | 2014-11-20 | 2014-11-20 | Pressure equalization cabin of pipe-jacking machine head and application method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN104482295A true CN104482295A (en) | 2015-04-01 |
Family
ID=52756871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410666746.6A Pending CN104482295A (en) | 2014-11-20 | 2014-11-20 | Pressure equalization cabin of pipe-jacking machine head and application method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN104482295A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2394075Y (en) * | 1999-10-22 | 2000-08-30 | 上海市第二市政工程有限公司机械厂 | Soil pressure balancing cutting and mixing conveyor |
| CN202176819U (en) * | 2011-07-20 | 2012-03-28 | 湖南望新建设集团股份有限公司 | Pressure balance pipe jacking device head |
| CN202381845U (en) * | 2011-12-14 | 2012-08-15 | 上海博欢基础钢构件有限公司 | Long-distance pipe jacking twist correction equipment |
-
2014
- 2014-11-20 CN CN201410666746.6A patent/CN104482295A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2394075Y (en) * | 1999-10-22 | 2000-08-30 | 上海市第二市政工程有限公司机械厂 | Soil pressure balancing cutting and mixing conveyor |
| CN202176819U (en) * | 2011-07-20 | 2012-03-28 | 湖南望新建设集团股份有限公司 | Pressure balance pipe jacking device head |
| CN202381845U (en) * | 2011-12-14 | 2012-08-15 | 上海博欢基础钢构件有限公司 | Long-distance pipe jacking twist correction equipment |
Non-Patent Citations (2)
| Title |
|---|
| 胡远辉等: "两种顶管工法在市政工程中的应用", 《重庆建筑》 * |
| 陈茂生: "全气压式作业法在人工掘进顶管工程中的应用", 《山西建筑》 * |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150401 |
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