CN108914944B - Sandbar high water level pipeline foundation pit excavation supporting dewatering system and construction method - Google Patents
Sandbar high water level pipeline foundation pit excavation supporting dewatering system and construction method Download PDFInfo
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- CN108914944B CN108914944B CN201810843557.XA CN201810843557A CN108914944B CN 108914944 B CN108914944 B CN 108914944B CN 201810843557 A CN201810843557 A CN 201810843557A CN 108914944 B CN108914944 B CN 108914944B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
Abstract
The invention discloses a shoring dewatering system for a high-water-level pipeline foundation pit excavation of a sandbank, which comprises a rod pile, wherein the rod pile is combined and comprises a pile rod at the rear end and a drill bit at the front end, the drill bits are divided into a threaded drill bit and a straight nail type drill bit, and drilling or tamping is adopted according to different drill bits; the end part of the pile rod is provided with a pile sleeve head, and the pile rod is connected with the cross rod through a clamp; the water filter plate is inserted into the inner side of the cross rod to block sand and filter water, and the soft water permeable pipe is embedded along the bottom of the side wall of the foundation pit with the water collecting and draining pit, so that water drainage and waterless construction of the bottom of the pit are guaranteed; the monitoring pipe is connected with the flexible permeable pipe to monitor the pollution condition of the underground water of the foundation pit. The invention also discloses a construction method of the shoring dewatering system for the shores of the sand continents high water level pipeline foundation pits. The invention has the advantages of monitoring water quality environment, reducing collapse and reducing quicksand; the settlement of the periphery of the foundation pit caused by precipitation is balanced; the construction quality is guaranteed; low construction cost.
Description
Technical Field
The invention relates to a foundation pit excavation supporting dewatering system, in particular to a sandbank high-water-level pipeline foundation pit excavation supporting dewatering system and a construction method.
Background
Along with the increasingly tense urban construction land in China, more and more areas close to the riverside, coastal and intertidal zones are developed, the excavation construction of foundation pits under the environments of high water level and sandy soil is gradually increased, and the construction difficulty points facing new geological environments are highlighted.
When the sandbar foundation pit is excavated, the underground water level is high, the water source is sufficient, the phenomena of large-area sand flowing and collapse are easy to occur, and the excavation cannot be smoothly carried out. The Larsen steel sheet pile is adopted for supporting, so that the collapse of a sandy soil pit wall caused by lateral water flow can be prevented, the side pressure is greatly increased, the extrusion and the lateral inclination are easy to occur when the Larsen steel sheet pile is improperly treated, the well point precipitation is increased, the supporting precipitation cost is greatly increased, and even the local large precipitation danger of unbalance at the periphery is caused.
Therefore, a system and a construction method which reduce hydraulic lateral pressure, balance foundation pit peripheral settlement, have obvious supporting and dewatering effects, are simple in construction operation and reduce cost under the condition of a small excavation surface are sought, and the system and the construction method have important practical significance for maintaining ecological environment and enhancing economic development.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a shoal high-water-level pipeline foundation pit excavation supporting dewatering system and a construction method, and is mainly used for solving the problem of difficulty in excavation supporting dewatering construction of high-water-level sandy soil foundation pits close to coastal areas, coastal areas and beach areas.
The invention is realized by the following steps:
a shoring dewatering system for a sandy continent high water level pipeline foundation pit excavation comprises a rod pile, a pile sleeve head, a hoop, a cross rod, a water filtering plate, a soft permeable pipe and a monitoring pipe, wherein the rod pile is combined and comprises a pile rod at the rear end and a drill bit at the front end; the end part of the pile rod is provided with a pile sleeve head, and the pile rod is connected with the cross rod through a clamp; the water filter plate is inserted into the inner side of the cross rod to block sand and filter water, and the soft water permeable pipe is embedded along the bottom of the side wall of the foundation pit with the water collecting and draining pit, so that water drainage and waterless construction of the bottom of the pit are guaranteed; the monitoring pipe is connected with the flexible permeable pipe to monitor the pollution condition of the underground water of the foundation pit.
The further scheme is as follows:
the pile rod and the drill bit are spirally screwed and fixed by a threaded nail, the drill bit is divided into a threaded drill bit and a straight nail type drill bit, and drilling or tamping is adopted according to different drill bits.
The further scheme is as follows:
the clamp comprises a screw fixing clamp and a clamp fixed by a full clamp;
the screw fixing clamps are used for arranging through holes at intervals of 10-30 cm on the rod pile, the through holes are sequentially arranged in a cross mode, and the arrangement range is 1/2-1/3 pile lengths from the pile top to the drill bit direction;
the hoop fixed by the full hoop does not need to be punched, and the setting range is 1/2-1/3 pile length from the pile top to the drill bit direction;
and (3) arranging grains and/or frosting treatment on the pile rod from the rest drill bit on the pile rod to the pile top direction of 1/2-2/3, and enhancing the engaging force of the pile body and the soil foundation to prevent the pile body from falling off and moving and inclining sideways.
The further scheme is as follows:
when the fixing clamp is fixed by adopting a screw fixing clamp, a counter-pull spiral rod is additionally arranged in the middle of the cross rod to install and fix the cross rod, a counter-pull hole is formed in the middle of the counter-pull spiral rod, counter-pull spirals are arranged at two ends of the counter-pull spiral rod, the length of a cross rod member is convenient to adjust, and spirals are arranged at two end ports of an end spiral cross rod on the side 2 of the counter-pull spiral rod;
when the clamp that adopts full clamp to fix, then directly choose for use the building to support the steel pipe, it is fixed directly through the clamp.
The further scheme is as follows:
the pile sleeve head comprises a driving sleeve head and a ramming sleeve head, the driving sleeve head is matched with the threaded drill bit, and the driving sleeve head is connected with a drilling driving shaft.
The further scheme is as follows:
the length of the water filtering plate is 2-3 m, and the water filtering plate comprises a net laminated water filtering plate, a plastic steel water filtering plate, a dustpan water filtering plate or a steel plate sieve water filtering plate.
The further scheme is as follows:
the net sandwiched film water filtering plate comprises a water filtering plate basket, steel mould nets, geotextiles and purlins, wherein vertical supporting strips are arranged in the middle of the water filtering plate basket at intervals of 20-30 cm, 2 steel mould nets are cut according to the size of the water filtering plate basket, a layer of geotextile with the same size as the water filtering plate basket is sandwiched in the middle of the 2 steel mould nets, the steel mould nets with the geotextiles sandwiched in the purlins and self-tapping nails are fixed on the water filtering plate basket, and the water filtering plate basket and the purlins are made of the same material and can be made of aluminum alloy, stainless steel and other steel materials; on the basis, the water filtering plate which is transformed into the steel mould net core block clamped with the geotextile and can be stretched, drawn and replaced in the water filtering plate basket can be upgraded;
the plastic steel water filtering plate is made of a plastic steel plate with a filter screen sandwiched in the middle;
the dustpan water filtering plate is formed by weaving branches or bamboo strips;
the steel plate sieve water filtering plate is formed by fixing a dense-hole sieve mesh on a steel plate strip welding lattice frame.
The further scheme is as follows:
the outer diameter of the soft water permeable pipe is 160mm, and the port of the soft water permeable pipe is positioned at the position of the water collecting and draining pit after being laid;
the monitoring pipe be 40mmPE pipe, set up the connection fixture block with the soft tub junction of permeating water, stretch into soft tub one end of permeating water and use the gauze parcel, length and backfill upper surface are the same height, go up mouthful to add the stopper lid and cover, open the extraction when the monitoring is pumped water.
The invention also provides a construction method of the sandbank high-water-level pipeline foundation pit excavation supporting precipitation system, which specifically comprises the following steps:
step 1, measurement lofting: measuring a lofting support excavation line, wherein the width of the excavation line is not less than the pipe diameter and the two sides are not less than 50 cm; then setting intervals according to the length of the water filter plates, determining and lofting the position of the rod-out pile, additionally arranging a water collecting and draining pit at the position of the pipe well, and additionally arranging the position of the water collecting and draining pit between the pipe wells.
And step 9: laying a pipeline and installing a monitoring pipe: after the pipeline is laid along the central line of the groove, a monitoring pipe is arranged on the flexible permeable pipe beside the pipeline interface position so as to conveniently perform sampling inspection on the water in the operation period to monitor the leakage condition of the pipeline.
Step 10: backfilling the groove, removing the cross rod and lifting the water filtering plate: and backfilling the pipeline symmetrically at two sides, monitoring that the periphery of the pipeline is manually compacted by centering in the backfilling process, removing the cross rod and lifting the water filtering plate after the groove is backfilled to the position of the cross rod, compacting the backfilled surface, and sequentially carrying out the operations until the cross rod is completely removed and the water filtering plate is completely drawn out, and backfilling and compacting the groove.
Step 11: backfilling a drainage pit, dismantling a cross rod and lifting a water filtering plate: and backfilling the water collecting and draining pit after the backfilling of the groove is finished, wherein the transverse rods on the periphery are detached and the drainage plate is lifted and pulled to backfill the same groove in the backfilling process until the backfilling of the water collecting and draining pit is finished.
Step 12: drawing or reversely drilling to lift out the pole pile and fill the pile hole: according to different rod piles, the rod pile with the spiral bit is lifted out by adopting a reverse rotary drill, the straight nail type rod pile is directly pulled and taken out, and then, the pile hole is filled by using coarse sand, sand gravel or broken stones.
The sand filtering plate is convenient to draw and install, water pressure is effectively reduced, quicksand is prevented from collapsing, a diversion curtain wall is formed, ground settlement caused by water drop is balanced, and damage caused by uneven settlement is effectively avoided; the rod pile adopted by the invention has grains, so that the binding force with sand is increased, the drill bit can be disassembled and replaced, and drilling and heavy hammer tamping can be respectively adopted according to the difference of the drill bit; the hoops are various in forms and are tightly connected, so that the anti-falling and anti-skidding effects can be effectively realized; the cross rods are different according to the clamping mode, the cross rods are various in type, the materials are convenient to obtain, and meanwhile, the backfilling depth of each time can be well controlled; the excavation failure surface of the foundation pit is small, the support precipitation investment is less, and the effect is obvious; the system has wide application range, can be repeatedly circulated by selecting materials, and has simple operation and small loss; the counter pressure of the side wall water flow from the base is eliminated, the overturning of the pit bottom is reduced, a flow guide system well guarantees pumping supply, fine sand is filtered, and the risk of water pump blockage and burning is reduced; the soft water permeable pipe can be used for drainage and collection, is convenient for pumping and drainage, and can be used as sewage drainage water to monitor a water taking space; the system enables the open drainage of collected water to be feasible in the excavation of the high-water-level sandy soil foundation pit, and the system is complete in structure, stable in structure and safe and reliable to use.
The beneficial effects of the invention are mainly as follows: the invention has the advantages of monitoring water quality and environment and reducing environment damage; the collapse and the quicksand are reduced, the sand filtration and water purification are performed during construction, and the safe and smooth operation of the water pump is guaranteed; the settlement of the periphery of the foundation pit caused by precipitation is balanced, and the danger of peripheral auxiliary buildings caused by unbalanced settlement is reduced; the backfill depth is well controlled; the construction quality is guaranteed; the system is simple in structure, materials are easy to select, operation is convenient, the hydraulic side pressure of the foundation pit is reduced, the structure is stable, the supporting effect is obvious, construction safety is guaranteed, construction cost is low, the system can be used in foundation pit excavation in soil environments with abundant underground water, the application range is wide, the traditional method is changed, the application of water collection and surface drainage in high-water-level sandy soil is made possible, and a stable and safe supporting precipitation system and a construction method are provided for sand bank pipeline foundation pit excavation construction.
Drawings
FIG. 1 is a schematic structural view of a net-sandwiched water-filtering plate according to an embodiment of the present invention;
FIG. 2 is a schematic view of a plastic-steel water filtering plate structure according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a dustpan water filtering plate structure of the embodiment of the invention;
FIG. 4 is a schematic structural view of a water filtering plate of a steel plate screen according to an embodiment of the present invention;
FIG. 5 is a schematic view of a support frame according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of a shoring precipitation system according to an embodiment of the invention;
fig. 7 is a schematic top view of a supporting precipitation system according to an embodiment of the invention.
Wherein, 1-net film-sandwiched water filtering plate, 1-water filtering plate basket, 1-2-steel mould net, 1-3-geotextile, 1-4-purlin, 1-5-self-tapping screw, 2-plastic-steel water filtering plate, 2-1-plastic steel plate, 2-filter screen, 3-dustpan water filtering plate, 4-steel plate water filtering plate, 5-pile rod, 6-drill, 6-1-straight nail type drill, 6-2-bit with spiral, 7-pile sleeve head, 7-1-driving sleeve head, 7-2-rammer sleeve head, 8-clamp, 8-1-full-clamping clamp, 8-2-screw rod fixing clamp, 9-cross rod, 9-1-counter-pull rod, 9-2-end spiral cross rod, 9-3-support steel pipe, 10-soft water permeable pipe, 11-connection clamp block, 9-3-connection clamp block, 12-monitoring pipe, 13-pipeline, 14-collecting drainage pit, 15-pipe well
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
As shown in the attached figures 1 to 7, the shoring dewatering system for the foundation pit excavation of the sand continents high water level pipeline is characterized in that:
(1) the pole pile is combined and comprises a pile pole 5 and a drill bit, the drill bit is divided into a threaded drill bit 6-2 and a straight nail type drill bit 6-1, the spiral drill bit 6-2 is provided with spiral threads, the straight nail type drill bit 6-1 is not provided with the spiral threads, and the pile pole 5 and the drill bit are screwed through screws and fixed by a screw nail; stake pole 5 is according to the difference of clamp form, the clamp that adopts the screw rod to fix need set up the perforation at pole stake every 10 ~ 30cm, set gradually a horizontal vertical cross of perforation, the setting range is pile bolck to drill bit direction 1/2 ~ 1/3 pile length, the clamp that adopts the full clamp to fix need not to punch, can establish line and dull polish to remaining drill bit to pile bolck direction 1/2 ~ 2/3 pile length, reinforcing pile body and soil matrix snap-in force prevent taking off and prevent moving the sideslip.
(2) The pile sleeve head 7 is different for different rod piles, a driving sleeve head 7-1 connected with a drilling driving shaft is additionally arranged for 6-2 rod piles with spiral drill bits, and the sleeve head is fixed on the rod piles by bolts; the tamping sleeve head 7-2 with a heavy hammer tamping surface is added aiming at the straight nail type rod pile, so that the damage to the rod pile during tamping is reduced.
(3) The clamp can be designed and selected in various ways, one end of the clamp can be provided with a screw rod penetrating pile, a fixed cross rod opening is provided with a threaded screw rod for fixing the clamp 8-2, the clamp can also be provided with a full-clamping connection clamp 8-1 and the like, and the design selection of the clamp needs to ensure that a rod piece of the clamp is stable and firm and can not be less than 150kN push-pull force.
(4) The water filter plate can be designed and selected in various ways: as shown in the attached drawing 1, a net-sandwiched membrane water filtering plate 1 can be used, which comprises a water filtering plate basket 1-1, a steel mould net 1-2, geotextile 1-3 and purlins 1-4, wherein the size of the water filtering plate basket 1-1 is standardized, vertical supporting strips are arranged in the middle of the basket every 20-30 cm, 1-22 pieces of steel mould nets are cut according to the size of the water filtering plate basket 1-1, 2 pieces of geotextile 1-3 with the size of the water filtering plate basket 1-1 are sandwiched in the middle of the steel mould nets 1-2, the steel mould nets 1-2 and self-tapping nails 1-5 which sandwich the geotextile 1-3 are fixed on the water filtering plate basket 1-1 by the purlins 1-4, and the water filtering plate basket 1-1 and the purlins 1-4 are made of the same material and can be made of aluminum alloy, stainless steel and other steel materials; on the basis, the water filtering plate which is transformed into the steel mould net 1-2 core block clamped with the geotextile 1-3 and can be stretched and drawn out and replaced in the mould frame can be upgraded. Or as shown in figure 2, a plastic steel water filtering plate 2 can be made by clamping a filtering net 2-2 in the middle of a plastic steel plate 2-1. Or a dustpan water filtering plate 3 woven by branches or bamboo strips, as shown in figure 3. Or a steel plate screen water filtering plate 4 formed by fixing a dense-hole screen mesh on a steel plate strip welding lattice frame, as shown in figure 4, and the like. Each board as required, can set up the draw-in groove in order to guarantee to stack when using in a plane not slip dislocation at the lower frame, drainage board length easily is 2 ~ 3m, specific design size as required.
(5) If the cross bar is fixed by the screw fixing clamp 8-2, the opposite-pulling spiral rod 9-1 is additionally arranged in the middle of the cross bar to install and fix the cross bar, the opposite-pulling spiral rod 9-1 is provided with an opposite-pulling hole in the middle, opposite-pulling spirals are arranged at two ends of the opposite-pulling spiral rod, the length of a rod piece of the cross bar is convenient to adjust, and spirals are arranged at two ports of the end spiral cross bar 9-2 at the side of the opposite-pulling spiral rod 9-12; if the whole hoop is adopted for fixation, the building supporting steel pipe 9-3 is directly selected and directly fixed by the hoop.
(6) The soft water permeable pipe 10 is a finished product purchased in the market, the outer diameter is 160mm, the soft water permeable pipe needs to be straightened and tightened when being laid, a port is arranged at the position of the water collecting and draining pit 14, and water in the foundation pit is drained to the water collecting and draining pit 14 for pumping and draining.
(7) Monitoring pipe 12 for the 40mmPE pipe of market purchase, set up connection fixture block 11 with the soft pipe 10 junction of permeating water, stretch into the soft pipe 10 one end of permeating water and use the gauze parcel, length and backfill upper surface are the same height, go up mouthful and add the stopper lid and cover, open the extraction when the monitoring is pumped water.
As a specific embodiment of the invention, the invention further provides a construction method of the sandbank high-water-level pipeline foundation pit excavation supporting precipitation system, which specifically comprises the following steps:
step 1, measurement lofting: measuring a lofting support excavation line, wherein the width of the excavation line is not less than the pipe diameter and the two sides are not less than 50 cm; then setting intervals according to the length of the water filter plates, measuring and lofting the positions of the rod-out piles, additionally arranging a water collecting and draining pit 14 at the position of a pipe well 15, and additionally arranging a water collecting and draining pit 14 between the pipe wells 15.
And step 9: laying a pipeline and installing a monitoring pipe 12: after the pipeline 13 is laid along the central line of the groove, a monitoring pipe 12 is arranged on the flexible water permeable pipe 10 beside the pipeline interface position, so that the leakage condition of the pipeline 12 can be conveniently monitored by sampling water in the operation period.
Step 10: backfilling the groove, removing the cross rod and lifting the water filtering plate: and backfilling the pipeline symmetrically at two sides, monitoring that the periphery of the pipeline is manually compacted by centering in the backfilling process, removing the cross rod and lifting the water filtering plate after the groove is backfilled to the position of the cross rod, compacting the backfilled surface, and sequentially carrying out the operations until the cross rod is completely removed and the water filtering plate is completely drawn out, and backfilling and compacting the groove.
Step 11: backfilling a water collecting and draining pit 14, dismantling a cross rod and lifting a water filtering plate: and backfilling the water collecting and draining pit 14 after the backfilling of the groove is finished, wherein cross bars on the periphery are detached in the backfilling process, and the drainage plates are lifted and pulled to backfill the same groove until the backfilling of the water collecting and draining pit 14 is finished.
Step 12: drawing or reversely drilling to lift out the pole pile and fill the pile hole: according to different rod piles, 6-2 rod piles with spiral drill bits are lifted out of the rod piles by reverse rotary drilling, straight nail type rod piles are directly pulled out, and then pile holes are filled with coarse sand, sand gravel or broken stones.
The invention has well controlled the trench backfill paving thickness by 1) arranging the position of the cross bar; 2) the arrangement of the monitoring pipe well monitors the leakage condition, thereby well avoiding falsification and ensuring the construction quality of the hidden project; 3) the used materials are simple, the system structure is simple, the use price is low, and the operation is simple; 4) the uniform sedimentation after pumping and draining of the underground water is ensured, and the danger brought to peripheral auxiliary buildings by the non-uniform sedimentation is avoided; 5) the system has good filtering effect on sandy soil, ensures the pumping drainage of clear water and reduces the danger of blockage and burning of a water pump; 6) the system is also suitable for other foundation pit excavation supports, and changes the traditional method, so that the application of the catchment open drain in high-water-level sandy soil becomes possible.
Claims (7)
1. A shoring dewatering system for a sandy continent high water level pipeline foundation pit excavation is characterized by comprising a rod pile, a pile sleeve head, a hoop, a cross rod, a water filtering plate, a soft permeable pipe and a monitoring pipe, wherein the rod pile is combined and comprises a pile rod at the rear end and a drill bit at the front end, the pile sleeve head is arranged at the end part of the pile rod, and the pile rod is connected with the cross rod through the hoop; the water filter plate is inserted into the inner side of the cross rod, the soft water permeable pipe is embedded along the bottom of the side wall of the foundation pit with the water collecting and draining pit, and the monitoring pipe is connected with the soft water permeable pipe; the water filtering plates comprise a net sandwiched film water filtering plate, a plastic steel water filtering plate, a dustpan water filtering plate or a steel plate water filtering plate, and the length of each water filtering plate is 2-3 m; the net sandwiched film water filtering plate comprises a water filtering plate basket, steel mould nets, geotextiles and purlins, wherein vertical supporting strips are arranged in the middle of the water filtering plate basket at intervals of 20-30 cm, 2 steel mould nets are cut according to the size of the water filtering plate basket, a layer of geotextile with the same size as the water filtering plate basket is sandwiched in the middle of the 2 steel mould nets, the steel mould nets with the geotextiles sandwiched are fixed on the water filtering plate basket through the purlins, self-tapping nails are added to the steel mould nets with the geotextiles sandwiched in the middle of the 2 steel mould nets, the water filtering plate basket and the purlins are made of the same material, and the water filtering;
the plastic steel water filtering plate is made of a plastic steel plate with a filter screen sandwiched in the middle;
the dustpan water filtering plate is formed by weaving branches or bamboo strips;
the steel plate sieve water filtering plate is formed by fixing a dense-hole sieve mesh on a steel plate strip welding lattice frame.
2. The shoreside high water level pipeline foundation pit excavation supporting dewatering system of claim 1, characterized in that:
the pile rod and the drill bit are spirally screwed and fixed by a threaded nail, and the drill bit is divided into a threaded drill bit and a straight nail type drill bit.
3. The shoreside high water level pipeline foundation pit excavation supporting dewatering system of claim 1, characterized in that:
the clamp comprises a screw fixing clamp and a clamp fixed by a full clamp;
the screw fixing clamps are used for arranging through holes at intervals of 10-30 cm on the rod pile, the through holes are sequentially arranged in a cross mode, and the arrangement range is 1/2-1/3 pile lengths from the pile top to the drill bit direction;
the hoop fixed by the full hoop does not need to be punched, and the setting range is 1/2-1/3 pile length from the pile top to the drill bit direction;
and (3) setting grains and/or sanding treatment on the pile rod from the rest drill bits on the pile rod to the pile top in the direction 1/2-2/3.
4. The sandbar high water level pipeline foundation pit excavation supporting precipitation system of claim 3, characterized in that:
when the fixing clamp is fixed by adopting a screw fixing clamp, a counter-pull spiral rod is additionally arranged in the middle of the cross rod to install and fix the cross rod, a counter-pull hole is formed in the middle of the counter-pull spiral rod, counter-pull spirals are arranged at two ends of the counter-pull spiral rod, the length of a cross rod member is convenient to adjust, and spirals are arranged at two end ports of an end spiral cross rod at two sides of the counter-pull spiral rod;
when the clamp that adopts full clamp to fix, then directly choose for use the building to support the steel pipe, it is fixed directly through the clamp.
5. The shoreside high water level pipeline foundation pit excavation supporting dewatering system of claim 1, characterized in that:
the pile sleeve head comprises a driving sleeve head and a ramming sleeve head, the driving sleeve head is matched with the threaded drill bit, and the driving sleeve head is connected with a drilling driving shaft.
6. The shoreside high water level pipeline foundation pit excavation supporting dewatering system of claim 1, characterized in that:
the outer diameter of the soft water permeable pipe is 160mm, and the port of the soft water permeable pipe is positioned at the position of the water collecting and draining pit after being laid;
the monitoring pipe be the PE pipe of 40mm external diameter, set up the connection fixture block in the union coupling department of permeating water with the soft formula, stretch into the soft formula and permeate water pipe one end and use the gauze parcel, length and backfill upper surface are the same high, go up mouthful to add the stopper and cover, open the extraction when the monitoring is pumped water.
7. The construction method of the sandbank high water level pipeline foundation pit excavation supporting precipitation system of any one of claims 1 to 6, characterized by comprising the following steps:
step 1, measurement lofting: measuring a lofting support excavation line, wherein the width of the excavation line is not less than the pipe diameter and the two sides are not less than 50 cm; then setting a distance according to the length of the water filter plate, determining and lofting the position of the rod-out pile, additionally arranging a water collecting and draining pit at the position of a pipe well, and additionally arranging a water collecting and draining pit between the pipe wells;
step 2, drilling or tamping a rod pile: designing and selecting a rod pile according to the excavation depth, drilling a hard geological layer underground at the position of the rod pile with a twist drill bit by adopting the rod pile with the twist drill bit, tamping the hard geological layer with a straight nail type rod pile by using a heavy hammer in a conventional stratum, and controlling the penetration depth and the pile top elevation, wherein the penetration depth of the rod pile after excavation of the foundation pit is not less than 1.5 times of the depth of the foundation pit;
step 3, trench excavation: the trench excavation is carried out by excavating a trench edge collecting and draining pit and a pipe well along the trench line to two sides in a layered manner, each layer is excavated by 30-50 cm, the excavation depth of each layer is determined according to the soil condition, and the excavation depth of each layer is determined by the fact that a large area is not easy to collapse immediately after excavation;
step 4, fixing a cross bar clamp: after each layer is excavated, immediately organizing manpower to carry out cross bar clamp fixing on the inner side of the groove; at the opening where the independent water collecting and draining pit 14 is connected with the groove, fixing the water collecting and draining pit surface by a cross bar hoop when the groove is backfilled;
step 5, inserting a water filter plate: after the cross rod clamp is fixed, after the first layer is excavated, a person is arranged to stand in the groove to insert the water filtering plate between the cross rod and the pit wall, so that the water filtering plate touches the bottom of the pit at the moment; after each layer of the rear layer is excavated and provided with the cross rod, one person is arranged in the groove to strickle the groove wall to guide the water filtering plate to move downwards, and one person is arranged outside the groove to be inserted into the groove along with the upper water filtering plate again and push the lower water filtering plate; at the opening of the independent water collecting and draining pit connected with the groove, the water filtering plates are sequentially inserted into the groove surface when the groove is backfilled;
step 6, pumping and draining water: after the drainage pit is excavated and a large amount of accumulated water appears, different water pumps are reasonably and dynamically replaced according to measurement and calculation, so that the situation that no large amount of accumulated water exists is ensured, the groove excavation along the groove line to two sides is carried out while pumping, and the pumping is carried out until the water supply and drainage pit is backfilled after the groove backfilling is finished;
step 7, manually cleaning the substrate: manually cleaning the groove which is excavated 15-20 cm away from the substrate, repairing 2-3% of downward slopes on the side of the groove wall of the substrate which is transversely provided with the water collecting and draining pit, arranging a draining ditch at the bottom of the side of the groove wall provided with the water collecting and draining pit, and draining the substrate;
step 8, burying a soft permeable pipe: embedding the soft water permeable pipe along the side base of the groove wall provided with the water collecting and draining pit 14, backfilling the embedded soft water permeable pipe to the height of the pipe bottom by using a designed pipe base material, and straightening the soft water permeable pipe before embedding;
and step 9: laying a pipeline and installing a monitoring pipe: after the pipeline is laid along the central line of the groove, a monitoring pipe 12 is arranged on the flexible permeable pipe beside the pipeline interface position so as to conveniently and selectively detect water in the operation period and monitor the leakage condition of the pipeline;
step 10: backfilling the groove, removing the cross rod and lifting the water filtering plate: backfilling the pipeline symmetrically at two sides, righting the periphery of the monitoring pipe in the backfilling process to be manually compacted, removing the cross rod and lifting the water filtering plate after the groove is backfilled to the position of the cross rod, and sequentially operating until the cross rod is completely removed and the water filtering plate is completely drawn out, and backfilling and compacting the groove;
step 11: backfilling a drainage pit, dismantling a cross rod and lifting a water filtering plate: backfilling the water collecting and draining pit after the backfilling of the groove is finished, wherein cross rods on the periphery are detached in the backfilling process, and the drainage plates are lifted and pulled to backfill the same groove until the backfilling of the water collecting and draining pit is finished;
step 12: drawing or reversely drilling to lift out the pole pile and fill the pile hole: according to different rod piles, the rod pile with the spiral bit is lifted out by adopting a reverse rotary drill, the straight nail type rod pile is directly pulled and taken out, and then, the pile hole is filled by using coarse sand, sand gravel or broken stones.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN112227499A (en) * | 2020-10-24 | 2021-01-15 | 安徽宸昊工程设计有限公司 | Municipal drainage pipeline construction technology |
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