CN110500122B - Waterproof reinforcing structure and waterproof reinforcing method for pipe-jacking construction hole - Google Patents
Waterproof reinforcing structure and waterproof reinforcing method for pipe-jacking construction hole Download PDFInfo
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- CN110500122B CN110500122B CN201910779007.0A CN201910779007A CN110500122B CN 110500122 B CN110500122 B CN 110500122B CN 201910779007 A CN201910779007 A CN 201910779007A CN 110500122 B CN110500122 B CN 110500122B
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- 238000010276 construction Methods 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003014 reinforcing effect Effects 0.000 title description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 247
- 230000000903 blocking effect Effects 0.000 claims abstract description 84
- 238000005086 pumping Methods 0.000 claims abstract description 67
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- 230000002787 reinforcement Effects 0.000 claims abstract description 17
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 239000002002 slurry Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000003566 sealing material Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 8
- 230000008901 benefit Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D11/14—Lining predominantly with metal
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention discloses a waterproof reinforcement structure for a pipe jacking construction hole, which comprises a steel box girder fixedly connected to the periphery of the construction hole through bolts, wherein an inner water blocking structure is fixedly connected to the axial inner side surface of the steel box girder, and an outer water blocking structure is fixedly connected to the axial outer side surface of the steel box girder; the inner water blocking structure and the outer water blocking structure both comprise a supporting plate and a rubber plate which is in press connection with the inner surface of the supporting plate; the supporting plate comprises a connecting part and a water blocking part, and the boundary between the connecting part and the water blocking part is positioned on the radial inner surface of the steel box girder; the radial inner end of the water blocking part is obliquely arranged inwards in the axial direction of the construction hole. The invention also discloses a corresponding pipe jacking construction hole waterproof reinforcement method. The waterproof sealing material has the characteristic of better sealing performance when the water pressure is higher, and has excellent waterproof performance. The invention is convenient for monitoring the water level at the construction hole, is convenient for pumping water, can seal the gap between the jacking pipe and the construction hole, and has good popularization and application values.
Description
Technical Field
The invention relates to the technical field of construction, in particular to a waterproof technology in pipe jacking construction.
Background
The pipe jacking construction is a main construction method for non-excavation underground pipeline construction, the construction method does not need to excavate a road surface layer, and can pass through roads, railways, rivers, ground buildings, underground structures, various underground pipelines and the like, and the pipe jacking construction has the advantages of no environment pollution, no influence on traffic, small damage to stratum structures, safe and reliable construction, short period, no need of transporting and stacking miscellaneous soil, low cost, remarkable social benefit and economic benefit and the like, so that the pipe jacking construction is widely applied.
When the pipe jacking construction is performed, a construction hole is required to be formed in the jacking working surface of the working well, and the diameter of the construction hole is slightly larger than that of the pipe jacking pipeline, so that an annular cavity is formed between the hole and the pipe jacking pipeline. The water seepage or groundwater in the soil body gradually flows into the annular cavity, so that waterproof measures are needed to be taken at the opening.
The traditional hole waterproof measure is to arrange an annular rubber water stop between the hole and the pipe-jacking pipeline. The measure can play a good role in water resistance when the water pressure is low; when the water pressure of annular cavity department is great, rubber waterstop can turn over to the entrance to a cave under the effect of water pressure (water turns up rubber waterstop) to can not play effectual waterproof effect.
The distance of pipe jacking construction is longer and longer, the volume of soil body that oozes to the annular cavity is bigger and bigger, and more water is collected more easily in annular cavity department and has great water pressure, therefore needs to design an effectual entrance to a cave waterproof construction.
In addition, in the pipe jacking construction process, if the water accumulation condition in the annular cavity can be effectively checked and the water in the annular cavity can be orderly discharged, the negative influence caused by water leakage at the hole can be further avoided.
Finally, the technology for reducing the accumulated water at the annular cavity has obvious positive significance for the hole waterproof work, but only the hole water blocking (waterproof) technology is adopted at present, and the technology for reducing the accumulated water is not adopted.
Disclosure of Invention
The invention aims to provide a waterproof reinforcing structure for a pipe jacking construction hole, which can play an effective role in preventing water from entering the hole under a large water pressure.
In order to achieve the above purpose, the invention provides a waterproof reinforcement structure for a pipe jacking construction hole, wherein the direction pointing to the axial outer side of the construction hole is axially outward, and the direction pointing to the axial inner side of the construction hole is axially inward; the radial distance between the outer wall of the pipeline of the jacking pipe and the wall of the construction hole is H1 cm, and a main annular cavity is formed between the outer wall of the pipeline of the jacking pipe and the wall of the construction hole;
the steel box girder is fixedly connected to the periphery of a construction hole through bolts, and the diameter of an inner hole of the steel box girder is the same as that of the construction hole; the inner side surface of the steel box girder is fixedly connected with an inner water blocking structure, the outer side surface of the steel box girder is fixedly connected with an outer water blocking structure, and the radial inner ends of the inner water blocking structure and the outer water blocking structure are connected with the outer wall of the construction jacking pipe;
the inner water blocking structure and the outer water blocking structure both comprise a supporting plate and a rubber plate which is in press connection with the inner surface of the supporting plate; bolts penetrate through the outer water-blocking structure, the steel box girder and the inner water-blocking structure and penetrate through an opening structure of a construction opening; the supporting plates of the inner water blocking structure and the outer water blocking structure comprise a connecting part and a water blocking part, and the boundary between the connecting part and the water blocking part is positioned on the radial inner surface of the steel box girder; the radial inner end of the water blocking part is obliquely arranged inwards in the axial direction of the construction hole, and the included angle alpha between the water blocking part and the radial direction of the construction hole is more than 5 degrees and less than 20 degrees;
an inner annular cavity is formed by the inner water blocking structure, the outer water blocking structure, the steel box girder and the jacking pipe.
The backup pad adopts any one of the following two kinds of structures along the circumference direction of steel case roof beam:
the first structure is an integrated annular structure in the circumferential direction of the steel box girder;
the second structure is a multi-section structure formed by uniformly spacing the steel box girder along the circumferential direction, and the spacing between two adjacent sections of support plates is 1-10 mm.
The top, the middle part and the middle lower part of the steel box girder are respectively provided with an observation and water pumping dual-purpose hole, one end of the observation and water pumping dual-purpose hole is communicated with the inner annular cavity, the other end of the observation and water pumping dual-purpose hole is opened on the exposed surface of the steel box girder, and a first plug is arranged in the observation and water pumping dual-purpose hole at the exposed surface of the steel box girder.
The connection structure of the connection part and the water blocking part is any one of the following two structures:
the first is that the connecting part and the water blocking part are of an integrated structure;
the second is that the connecting part and the water-blocking part are hinged together through a hinge.
The side wall of the construction hole structure is provided with a buried water stop belt, the buried water stop belt is in compression fit with the outer wall of the jacking pipe and divides the main annular cavity into an inner annular cavity and an outer annular cavity, water pumping and grouting dual-purpose holes are respectively arranged in the side wall of the construction hole structure at the inner annular cavity and the outer annular cavity, and four groups of water pumping and grouting dual-purpose holes are uniformly arranged along the circumferential direction of the construction hole;
one end of the water pumping and grouting dual-purpose hole is communicated with the main annular cavity, the other end of the water pumping and grouting dual-purpose hole is opened on the axial outer surface of the construction hole structure, the outer end of the water pumping and grouting dual-purpose hole is connected with a connector, and the connector is connected with a second plug.
The invention also provides a pipe jacking construction hole waterproof reinforcement method by using the pipe jacking construction hole waterproof reinforcement structure, which comprises the following steps:
the first step is an installation step; the inner water blocking structure and the outer water blocking structure are respectively arranged on the axial inner surface and the axial outer surface of the steel box girder, and the outer water blocking structure, the steel box girder and the inner water blocking structure are fixed on the hole structure of the construction hole through bolts;
the second step is pipe jacking construction, wherein the pipe jacking is connected with the inner water blocking structure and the outer water blocking structure after being jacked into a construction hole to form two water blocking structures;
the third step is water level monitoring and pumping operation;
the staff sequentially opens the first plugs at the two-purpose holes for observing and pumping from top to bottom, and the water level can be determined after water is found for the first time; when the water level is higher, the second plug is taken down, one end of the external water suction pipe is connected with the connector, the other end of the water suction pipe is connected with the water suction pump, and the water suction pump is turned on to pump out water in the main annular cavity; after the water pumping is completed, the water pump is closed, the water pumping pipe is separated from the connector, and a second plug is arranged on the connector.
In the third step, pumping operation of the inner annular cavity is also carried out; after the main annular cavity is pumped, the water pumping pipe is connected with the observation and pumping dual-purpose hole, and the water pumping pump is opened to pump water to the inner annular cavity.
And (3) carrying out hole sealing operation after pipe jacking construction, injecting plugging slurry into the main annular cavity through the water pumping grouting dual-purpose hole, and solidifying the slurry in the main annular cavity to form a plugging layer.
The invention has the following advantages:
the waterproof reinforcement structure and the waterproof reinforcement method have the characteristics of better sealing performance when the water pressure is higher, and excellent waterproof performance. The invention is convenient for monitoring the water level at the construction hole, is convenient for pumping water, can seal the gap (main annular cavity) between the jacking pipe and the construction hole, and has good popularization and application values.
The direction of water pressure points to the axial outside of construction entrance to a cave, and the radial inner of portion that blocks water is inwards inclined to the axial of construction entrance to a cave sets up, and the length of portion that blocks water is necessarily greater than H1 centimetre like this, and the water pressure is to the outside pressure of axle, just can't be with the portion that blocks water outwards turn up, can only with the portion that blocks water more closely press on the top pipe outer wall. Therefore, the invention can prevent the water-blocking structure from turning up outwards by water pressure, and avoid the failure of the water-blocking structure.
If the alpha is too small, the water-blocking part of the alpha is easy to turn outwards under the action of water pressure; if alpha is too large, the water-blocking portion will be too long and waste material on the one hand, and on the other hand, the water-blocking portion will tend to turn inwards under the influence of water buoyancy. Alpha is more than 5 degrees and less than 20 degrees, so that the water is prevented from turning the water-blocking part outwards and is prevented from turning the water-blocking part inwards, and a reliable waterproof effect is achieved.
The inner water-blocking structure and the outer water-blocking structure form two water-blocking structures, so that the water-blocking effect is enhanced. The supporting plate adopts a multi-section structure, so that the processing and the manufacturing are convenient; the backup pad adopts integral type annular structure, the installation of being convenient for.
The dual-purpose hole for observing and pumping is convenient for a worker to monitor the water level in the inner annular cavity, and water in the inner annular cavity can be pumped out after the water pumping pipe is connected.
The water in the main annular cavity can be conveniently pumped out due to the arrangement of the water pumping grouting dual-purpose holes, grouting can be performed in the main annular cavity, and water leakage at a construction hole is prevented.
Drawings
FIG. 1 is a schematic diagram of a pipe-jacking work well;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic view of the structure of the present invention when the support plate has a multi-stage structure;
FIG. 4 is a schematic vertical cross-sectional view of the present invention;
fig. 5 is an enlarged view at a in fig. 4.
Detailed Description
As shown in fig. 1 to 5, the pipe jacking construction hole waterproof reinforcement structure takes the direction pointing to the axial outer side of the construction hole as the axial outward direction, and takes the direction pointing to the axial inner side of the construction hole as the axial inward direction; the radial distance between the outer wall of the pipeline of the jacking pipe 9 and the wall of the construction hole is H1 cm, and a main annular cavity is formed between the outer wall of the pipeline of the jacking pipe 9 and the wall of the construction hole;
the steel box girder comprises an annular steel box girder 1, wherein the steel box girder 1 is fixedly connected to the periphery of a construction hole through bolts 3, and the diameter of an inner hole of the steel box girder 1 is the same as the diameter of the construction hole; the inner axial side surface of the steel box girder 1 is fixedly connected with an inner water blocking structure, the outer axial side surface of the steel box girder 1 is fixedly connected with an outer water blocking structure, and the radial inner ends of the inner water blocking structure and the outer water blocking structure are connected with the outer wall of the construction jacking pipe 9;
the inner water-blocking structure and the outer water-blocking structure both comprise a supporting plate and a rubber plate 4 which is in press connection with the inner surface of the supporting plate; the bolts 3 penetrate through the outer water-blocking structure, the steel box girder 1 and the inner water-blocking structure and penetrate through an opening structure 7 of the construction opening; the supporting plates of the inner water blocking structure and the outer water blocking structure comprise a connecting part 5 and a water blocking part 6, and the boundary line of the connecting part 5 and the water blocking part 6 is positioned on the radial inner surface of the steel box girder; the radial inner end of the water blocking part 6 is obliquely arranged inwards in the axial direction of the construction hole, and the included angle alpha between the water blocking part 6 and the radial direction of the construction hole is more than 5 degrees and less than 30 degrees, preferably 15 degrees. The rubber plate 4 is slightly longer than the supporting plate, and along the radial direction of the construction hole, the radial inner end of the rubber plate 4 protrudes out of the radial inner end of the supporting plate, so that the rubber plate 4 is ensured to contact the pipe wall of the jacking pipe 9 earlier than the supporting plate.
When α is 30 degrees and H1 is 10 cm, the length of the water blocking portion 6 is about 12 cm.
An inner annular cavity 11 is formed by the inner water blocking structure, the outer water blocking structure, the steel box girder 1 and the jacking pipe 9.
Wherein, the inner water-blocking structure and the outer water-blocking structure are both made of steel plates.
The direction of water pressure points to the axial outside of construction entrance to a cave, and the radial inner end of the portion 6 that blocks water inwards inclines to the axial of construction entrance to a cave sets up, and the length of portion 6 that blocks water is necessarily greater than H1 cm (through being 10 cm) like this, and when the portion 6 that blocks water is pressed to the outside in axial to water pressure, the portion 6 that blocks water can't outwards turn up, can only press the portion 6 that blocks water more closely on the outer wall of push pipe 9. Therefore, the invention can prevent the water-blocking structure from turning up outwards by water pressure, and avoid the failure of the water-blocking structure.
If α is too small, the water blocking portion 6 is easily turned outward by the water pressure; if a is too large, the water blocking portion 6 will be too long and waste material on the one hand, and the water blocking portion 6 will easily turn inwards under the influence of water buoyancy on the other hand. Alpha is more than 5 degrees and less than 20 degrees, which not only prevents water from turning over the water-blocking portion 6 outwards, but also prevents water from turning over the water-blocking portion 6 inwards, thus playing a reliable waterproof role.
The inner water-blocking structure and the outer water-blocking structure form two water-blocking structures, so that the water-blocking effect is enhanced.
The supporting plate adopts any one of the following two structures along the circumferential direction of the steel box girder 1:
the first structure is an integral annular structure in the circumferential direction of the steel box girder 1;
the second structure is shown in fig. 3, and a multi-section structure is formed at uniform intervals in the circumferential direction of the steel box girder 1, and the interval between two adjacent support plates is 1-10 mm.
The supporting plate adopts a multi-section structure, so that the processing and the manufacturing are convenient; the backup pad adopts integral type annular structure, the installation of being convenient for.
The connection structure of the connection part and the water blocking part is any one of the following two structures:
the first is that the connecting part and the water blocking part are of an integrated structure;
the second is that the connecting part and the water-blocking part are hinged together by a hinge 8.
The top, the middle part and the middle lower part of the steel box girder 1 are respectively provided with an observation and water pumping dual-purpose hole 10, one end of the observation and water pumping dual-purpose hole 10 is communicated with the inner annular cavity 11, the other end of the observation and water pumping dual-purpose hole 10 is opened on the exposed surface of the steel box girder 1, and a first plug is arranged in the observation and water pumping dual-purpose hole 10 at the exposed surface of the steel box girder 1.
The wall of the plug and the wall of the observation pumping dual-purpose hole 10 can be tightly matched, and can also be connected by bolts 3.
The dual-purpose hole 10 for observing and pumping water is convenient for a worker to monitor the water level in the inner annular cavity 11 and can pump out the water in the inner annular cavity 11 after the water pumping pipe is connected.
The side wall of the construction hole structure is provided with a buried water stop belt 2, the buried water stop belt 2 is in compression fit with the outer wall of the jacking pipe 9 and divides the main annular cavity into an inner annular cavity 21 and an outer annular cavity 22, the side wall of the construction hole structure at the positions of the inner annular cavity 21 and the outer annular cavity 22 is respectively provided with a water pumping grouting dual-purpose hole 12, and four groups of water pumping grouting dual-purpose holes 12 are uniformly arranged along the circumferential direction of the construction hole; the embedded water stop 2 divides the main annular cavity into the inner annular cavity 21 and the outer annular cavity 22 to form two seals, so that the resistance of the water in the construction hole structure to the outside leakage is more, the water pressure at the water-blocking structure is reduced, and the waterproof performance of the construction hole structure is enhanced.
After the pipe jacking construction is completed, micro-expansion concrete is injected into the inner annular cavity 21 and the outer annular cavity 22 for plugging through the water pumping and grouting dual-purpose holes 12 at the inner annular cavity 21 and the water pumping and grouting dual-purpose holes 12 at the outer annular cavity 22. After the plugging, the embedded water stop belt 2 is used as a water stop guarantee structure.
In the pipe jacking construction process, when the embedded water stop 2 is turned outwards under the action of water pressure, a certain grouting pressure is provided to the outer annular cavity 22 through the water pumping and grouting dual-purpose hole 12 at the outer annular cavity 22, so that the embedded water stop 2 is turned backwards and reset, and the water stop effect is enhanced.
One end of the water pumping and grouting dual-purpose hole 12 is communicated with the main annular cavity, the other end of the water pumping and grouting dual-purpose hole 12 is opened on the axial outer surface of the construction hole structure 7, the outer end of the water pumping and grouting dual-purpose hole 12 is connected with a connector 13, and the connector 13 is connected with a second plug. The plugs are of conventional structure, and the first plug and the second plug are not shown in the figure.
The water in the main annular cavity is conveniently pumped out due to the arrangement of the water pumping grouting dual-purpose hole 12, so that grouting can be performed in the main annular cavity, and water leakage at a construction hole is prevented.
The invention also discloses a pipe jacking construction hole waterproof reinforcement method using the pipe jacking construction hole waterproof reinforcement structure, which comprises the following steps:
the first step is an installation step; the inner water blocking structure and the outer water blocking structure are respectively arranged on the axial inner surface and the axial outer surface of the steel box girder 1, and the outer water blocking structure, the steel box girder 1 and the inner water blocking structure are fixed on an opening structure 7 of a construction opening through bolts 3;
the second step is pipe jacking construction, wherein the pipe jacking 9 is connected with the inner water blocking structure and the outer water blocking structure after being jacked into a construction hole to form two water blocking structures; when the water pressure in the main annular cavity is high, the water blocking part 6 of the internal water blocking structure is pressed outwards against the outer wall of the jacking pipe 9 under the action of the water pressure; the higher the water pressure is, the tighter the pressure is, and the better the sealing effect is, so that the invention has the outstanding advantage of better sealing performance when the water pressure is higher.
The water in part of the main annular cavity breaks through the internal water blocking structure and enters the inner annular cavity 11, the water pressure in the inner annular cavity 11 is greatly smaller than that of the main annular cavity, and the external water blocking structure always seals water with lower water pressure (cannot face higher water pressure), so that a good sealing effect is achieved.
The third step is water level monitoring and pumping operation;
the staff sequentially opens the first plugs at the positions of the observation and pumping dual-purpose holes 10 from top to bottom, and the water level can be determined after water is found for the first time; when the water level is higher (for example, the water level exceeds half of the height of a construction hole), the second plug is removed, one end of the external water suction pipe is connected with the connector 13, the other end of the water suction pipe is connected with the water suction pump, and the water suction pump is turned on to pump out water in the main annular cavity; after the water pumping is completed, the water pumping pump is turned off, the water pumping pipe is separated from the connector 13, and a second plug (pressed in or in threaded connection) is arranged on the connector.
The waterproof reinforcement structure and the waterproof reinforcement method have the characteristics of better sealing performance when the water pressure is higher, and excellent waterproof performance.
In the third step, pumping operation of the inner annular cavity 11 is also performed; after the main annular cavity is pumped, a water pumping pipe is connected with the observation and pumping dual-purpose hole 10, and the water pumping pump is opened to pump water to the inner annular cavity 11.
And (3) carrying out hole sealing operation after pipe jacking construction, injecting plugging slurry into the main annular cavity through the water pumping grouting dual-purpose hole 12, and solidifying the slurry in the main annular cavity to form a plugging layer.
The plugging slurry can be concrete, foaming agent or other materials.
Because the main annular cavity is blocked, water in the soil body is difficult to reach the opening of the construction hole, the waterproof performance of the construction hole is greatly improved, maintenance-free monitoring-free construction hole can be realized in the long-term use process, and water leakage at the construction hole is avoided.
The above embodiments are only for illustrating the technical solution of the present invention, and it should be understood by those skilled in the art that although the present invention has been described in detail with reference to the above embodiments: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.
Claims (3)
1. The pipe jacking construction hole waterproof reinforcement method is carried out by using a pipe jacking construction hole waterproof reinforcement structure, wherein the direction pointing to the axial outer side of the construction hole is axially outward, and the direction pointing to the axial inner side of the construction hole is axially inward; the radial distance between the outer wall of the pipeline of the jacking pipe and the wall of the construction hole is H1 cm, and a main annular cavity is formed between the outer wall of the pipeline of the jacking pipe and the wall of the construction hole;
the pipe jacking construction hole waterproof reinforcement structure comprises an annular steel box girder, wherein the steel box girder is fixedly connected to the periphery of the construction hole through bolts, and the diameter of an inner hole of the steel box girder is the same as that of the construction hole; the inner side surface of the steel box girder is fixedly connected with an inner water blocking structure, the outer side surface of the steel box girder is fixedly connected with an outer water blocking structure, and the radial inner ends of the inner water blocking structure and the outer water blocking structure are connected with the outer wall of the construction jacking pipe;
the inner water blocking structure and the outer water blocking structure both comprise a supporting plate and a rubber plate which is in press connection with the inner surface of the supporting plate; bolts penetrate through the outer water-blocking structure, the steel box girder and the inner water-blocking structure and penetrate through an opening structure of a construction opening; the supporting plates of the inner water blocking structure and the outer water blocking structure comprise a connecting part and a water blocking part, and the boundary between the connecting part and the water blocking part is positioned on the radial inner surface of the steel box girder; the radial inner end of the water blocking part is obliquely arranged inwards in the axial direction of the construction hole, and the included angle alpha between the water blocking part and the radial direction of the construction hole is more than 5 degrees and less than 20 degrees;
an inner annular cavity is formed by the inner water blocking structure, the outer water blocking structure, the steel box girder and the jacking pipe in a surrounding manner;
the backup pad adopts any one of the following two kinds of structures along the circumference direction of steel case roof beam:
the first structure is an integrated annular structure in the circumferential direction of the steel box girder;
the second structure is that a multi-section structure is formed at equal intervals in the circumferential direction of the steel box girder, and the interval between two adjacent sections of support plates is 1-10 mm;
the top, the middle part and the middle lower part of the steel box girder are respectively provided with an observation and water pumping dual-purpose hole, one end of the observation and water pumping dual-purpose hole is communicated with the inner annular cavity, the other end of the observation and water pumping dual-purpose hole is opened on the exposed surface of the steel box girder, and a first plug is arranged in the observation and water pumping dual-purpose hole at the exposed surface of the steel box girder;
the connection structure of the connection part and the water blocking part is any one of the following two structures:
the first is that the connecting part and the water blocking part are of an integrated structure;
the second is that the connecting part and the water blocking part are hinged together through a hinge;
the side wall of the construction hole structure is provided with a buried water stop belt, the buried water stop belt is in compression fit with the outer wall of the jacking pipe and divides the main annular cavity into an inner annular cavity and an outer annular cavity, water pumping and grouting dual-purpose holes are respectively arranged in the side wall of the construction hole structure at the inner annular cavity and the outer annular cavity, and four groups of water pumping and grouting dual-purpose holes are uniformly arranged along the circumferential direction of the construction hole;
one end of the water pumping and grouting dual-purpose hole is communicated with the main annular cavity, the other end of the water pumping and grouting dual-purpose hole is opened on the axial outer surface of the construction hole structure, the outer end of the water pumping and grouting dual-purpose hole is connected with a connector, and the connector is connected with a second plug;
the method is characterized by comprising the following steps of:
the first step is an installation step; the inner water blocking structure and the outer water blocking structure are respectively arranged on the axial inner surface and the axial outer surface of the steel box girder, and the outer water blocking structure, the steel box girder and the inner water blocking structure are fixed on the hole structure of the construction hole through bolts;
the second step is pipe jacking construction, wherein the pipe jacking is connected with the inner water blocking structure and the outer water blocking structure after being jacked into a construction hole to form two water blocking structures;
the third step is water level monitoring and pumping operation;
the staff sequentially opens the first plugs at the two-purpose holes for observing and pumping from top to bottom, and the water level can be determined after water is found for the first time; when the water level is higher, the second plug is taken down, one end of the external water suction pipe is connected with the connector, the other end of the water suction pipe is connected with the water suction pump, and the water suction pump is turned on to pump out water in the main annular cavity; after the water pumping is completed, the water pump is closed, the water pumping pipe is separated from the connector, and a second plug is arranged on the connector.
2. The pipe-jacking construction hole waterproof reinforcement method according to claim 1, wherein the method comprises the following steps: in the third step, pumping operation of the inner annular cavity is also carried out; after the main annular cavity is pumped, the water pumping pipe is connected with the observation and pumping dual-purpose hole, and the water pumping pump is opened to pump water to the inner annular cavity.
3. The pipe-jacking construction hole waterproof reinforcement method according to claim 1, wherein the method comprises the following steps:
and (3) carrying out hole sealing operation after pipe jacking construction, injecting plugging slurry into the main annular cavity through the water pumping grouting dual-purpose hole, and solidifying the slurry in the main annular cavity to form a plugging layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910779007.0A CN110500122B (en) | 2019-08-22 | 2019-08-22 | Waterproof reinforcing structure and waterproof reinforcing method for pipe-jacking construction hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910779007.0A CN110500122B (en) | 2019-08-22 | 2019-08-22 | Waterproof reinforcing structure and waterproof reinforcing method for pipe-jacking construction hole |
Publications (2)
| Publication Number | Publication Date |
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| CN110500122A CN110500122A (en) | 2019-11-26 |
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