CN109736336B - Installation process of steel pouring jacket for pier bearing platform construction - Google Patents
Installation process of steel pouring jacket for pier bearing platform construction Download PDFInfo
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- CN109736336B CN109736336B CN201910083593.5A CN201910083593A CN109736336B CN 109736336 B CN109736336 B CN 109736336B CN 201910083593 A CN201910083593 A CN 201910083593A CN 109736336 B CN109736336 B CN 109736336B
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Abstract
The invention discloses an installation process of a steel sleeve box for pier bearing platform construction, which comprises the following steps: excavation of a foundation pit, leveling of a foundation bed, manufacturing of a steel sleeve box, preparation of launching of the steel sleeve box, positioning of the steel sleeve box and sinking of the steel sleeve box. According to the invention, when the steel sleeve box is drained, the steel sleeve box is supported by the air bag, power is provided by the barge in the front, the two winches in the rear part control the sliding speed to enable the steel sleeve box to slide down to the water from the splicing platform and the drainage slideway, after the steel sleeve box enters the water, the steel sleeve box is pulled and positioned by the eight winches, and then water is injected into the wall plate cavity of the steel sleeve box to enable the steel sleeve box to sink in place. The installation process of the steel pouring jacket disclosed by the invention has the advantages that under the conditions of relatively slow water flow speed, relatively stable water level during construction and narrow river channel, the positioning and sinking of the steel pouring jacket are well completed by adopting a guide-frame-free winch positioning system in combination with the terrain of a bridge area, the navigation is not influenced, the construction operation is not influenced, the arrangement is reasonable and simple, the construction cost is low, and the operation is convenient.
Description
Technical Field
The invention relates to an installation process of a steel pouring jacket for pier bearing platform construction.
Background
When the pier bearing platform is located in a slightly weathered rock stratum, the steel sheet piles and the steel pipe piles cannot be driven, the steel pipe pile platforms and the steel sheet pile cofferdams cannot be driven, and the steel sleeve box is used as a water enclosing structure when the bottom of the bearing platform reaches the construction water level of about 15-16 m. The steel boxed box is a temporary structure sleeved outside a permanent structure as the name implies, and plays a role of a cofferdam. The steel sleeve box is a common enclosure structure form in the overwater construction operation of a bridge foundation and a substructure, is particularly suitable for a deep water foundation in a large river, can bear larger water pressure, and ensures the annual construction safety flood of the foundation. Particularly, the steel sleeve box shows the superiority under the conditions that the building envelopes such as steel sheet piles, island-building cofferdams and the like cannot be adopted due to difficult construction conditions or limitations of hydrological conditions, topographic conditions and geological conditions. The size and weight of the steel jacket box, the water depth and flow rate, the water surface width, the navigation condition, the transportation distance, the capacity of hoisting equipment, safety, arrangement of a construction period, comparison of cost and the like are considered when the steel jacket box is installed. In general, a large guide frame is required to be arranged for guiding and installing the steel sleeve box in order to accurately position and sink. The guide frame is complex in construction process and high in construction difficulty and construction cost in deepwater foundation construction.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an installation process of a steel sleeve box for pier bearing platform construction, which can realize quick and safe construction.
The purpose of the invention is realized as follows: a mounting process of a steel pouring jacket for pier bearing platform construction is characterized in that the steel pouring jacket is rectangular and has a bottomless structure, and a wall body of the steel pouring jacket comprises two along-bridge wall plates, two transverse-bridge wall plates and an inner support; the width of the forward bridge wall plate is smaller than that of the transverse bridge wall plate; the forward-bridge wall plate and the transverse-bridge wall plate are both of double-wall structures; the forward bridge wall plate is divided into two horizontal waterproof bins through a bin separation plate; the transverse bridge wall plate is divided into three transverse waterproof bins through two bin-dividing partition plates; the forward-direction wallboard and the transverse-direction wallboard respectively comprise an inner panel, an outer panel, a side plate and a bottom plate; two sides of the inner panels of the two along-bridge wall plates and the bin dividing partition plates are respectively provided with a water level hole at the same height; the middle part of the outer panel of the transverse bridge direction wall plate on the river side and the two bin separation partition plates are respectively provided with a water level hole at the same height; two bin partition plates of the transverse bridge direction wall plate on the bank side are respectively provided with a water level hole at the same height; a connecting through hole is also formed in the transverse bridge wall plate on the river side; the inner support comprises first to third layers of planar frames;
the installation process of the steel pouring jacket comprises the following steps: excavating a foundation pit, flattening a foundation bed, manufacturing a steel sleeve box, preparing the steel sleeve box to launch, launching the steel sleeve box, positioning the steel sleeve box and sinking the steel sleeve box;
when the foundation pit excavation process is carried out, a method combining land excavation, water excavation and reef explosion is adopted; the inner edge of the foundation pit needs to enter the inner wall of the steel sleeve box by 1 m; the outer edge of the foundation pit transversely exceeds the outer wall of the steel tapping pouring jacket by 3m in the bridge direction, and the outer edge of the foundation pit exceeds the outer wall of the steel tapping pouring jacket by 2m in the bridge direction;
when the foundation bed leveling process is carried out, a leveling ship and a diver underwater leveling combined method is adopted, a crushed stone layer with the thickness of 50cm is laid on a foundation pit, the laying inner edge of the crushed stone layer enters the steel pouring jacket for 1m, and the laying outer edge of the crushed stone layer exceeds the outer wall of the steel pouring jacket for 2m, so that a foundation bed for mounting the steel pouring jacket is formed;
when the steel sleeve box manufacturing process is carried out, firstly, the steel sleeve box is processed in a factory in sections and separated, then the steel sleeve box is transported to an assembling platform to be assembled section by section, the assembling platform is positioned on a river beach near the installation position of a pier and is subjected to leveling and hardening treatment, the slope ratio is 1:30, and steel buttresses which are adaptive to the plane size of the steel sleeve box and are horizontal are paved on the assembling platform; synchronously mounting a bottom sealing supporting plate when the wall body of the steel sleeve box is assembled; after the wall body of the steel sleeve box is assembled, internal support installation is carried out; the transverse bridge direction wall plate of the assembled steel pouring jacket is in a transverse water flow direction;
the preparation process for launching the steel jacket box comprises the following steps:
1) leveling a launching slideway with a slope ratio of 1:20 between the front edge of the assembly platform and the river bank;
2) the pull lugs at the bottoms of two sides of the rear end of the steel pouring jacket, which are opposite to the rear 8m of the splicing platform, are correspondingly provided with a first winch and a second winch one by one; the fourth winch and the third winch are arranged on two sides of the assembling platform in a one-to-one correspondence mode, and the sixth winch and the fifth winch are arranged on the opposite bank side of the assembling platform; tenth and ninth winches are arranged on the two sides of the bed in a one-to-one correspondence manner, and eighth and seventh winches are arranged on the opposite bank sides of the bed; a steel wire rope of the third winch and a steel wire rope of the fourth winch are respectively hung on the pull lugs at the bottoms of the two sides of the rear end of the steel sleeve box; a steel wire rope of the fifth winch and a steel wire rope of the sixth winch are respectively hung on the pull lugs at the bottoms of the two sides of the front end of the steel sleeve box;
3) two rows of air bags are arranged at the bottom of the steel sleeve box along the river bank and connected through a thin steel wire rope;
4) respectively hanging an auxiliary stay rope connected with the barge on the pull lugs at the bottoms of the two sides of the front end of the steel sleeve box, respectively hanging a rear stay rope on the pull lugs at the bottoms of the two sides of the rear end of the steel sleeve box, and respectively connecting the two rear stay ropes with the first winch and the second winch correspondingly through a cable breaker; each cable breaker is connected with a pull cable hung on the crane;
5) inflating an air bag positioned at the front end of the steel jacket box, jacking the steel jacket box at the front end, cutting off the steel buttress at the front end of the steel jacket box, properly deflating the air bag positioned at the front end of the steel jacket box while inflating the air bag positioned at the tail part of the steel jacket box, and cutting off the rest steel buttress after the tail part of the whole steel jacket box tilts to be in a balanced state; sliding the steel sleeve box downwards under the condition of ensuring that all the air bags are in the same air pressure state;
when a steel jacket box launching process is carried out, two rear pull ropes are slowly released through a first winch and a second winch, the two auxiliary pull ropes provide power through a barge to enable the steel jacket box to slowly slide along the gradient of an assembly platform, a connection air bag is fed into the front end of the steel jacket box in the sliding process until the steel jacket box slides to a preset position, the first winch and the second winch are closed, two lifting pull ropes of a crane are used for unhooking a cable breaker, the two rear pull ropes are unhooked from the steel jacket box, the steel jacket box freely accelerates to slide downwards on a launching slideway, and the steel jacket box is flushed into water and slides for a certain distance into a river by utilizing the inertia of the steel jacket box; after the steel jacket box completely enters water and is slowly stopped, the position of the steel jacket box is adjusted through a third winch, a fourth winch, a fifth winch and a sixth winch to enable the steel jacket box to enter a bottom plate removing area, a bottom removing worker enters the steel jacket box through a transport ship, and a bottom sealing supporting plate hung on the steel jacket box is quickly removed;
the steel pouring jacket positioning process comprises the following steps:
1) respectively pulling and hanging a steel wire rope of a seventh winch and a steel wire rope of a ninth winch on pull lugs at the tops of the two sides of the front end of the steel jacket box, and respectively pulling and hanging a steel wire rope of an eighth winch and a steel wire rope of a tenth winch on pull lugs at the tops of the two sides of the rear end of the steel jacket box;
2) an operator slowly loosens the cables of the fourth winch, the fifth winch and the sixth winch, slowly retracts the cables of the seventh winch, the ninth winch and the tenth winch, and slowly adjusts the steel sleeve box to a position where the transverse bridge wall plate is in the direction along the water flow;
3) firstly, removing a steel wire rope of a fifth winch from a pull lug of a steel wire rope hanger of a tenth winch, and then removing a steel wire rope of a fourth winch and a steel wire rope of a sixth winch; moving the steel jacket box to the outer side of the position of the foundation bed through a seventh winch, an eighth winch, a ninth winch, a tenth winch, a third winch and a fifth winch, and then dismantling a steel wire rope of the fifth winch; slowly adjusting the steel jacket box to the position of the foundation bed through a seventh winch, an eighth winch, a ninth winch, a tenth winch and a third winch;
the steel bushing box sinking process comprises the following steps:
1) synchronously injecting water into ten water-separation bins of the steel jacket box, monitoring the posture, the sinking elevation and the plane position of the steel jacket box at any time in the water injection process, injecting water while adjusting the plane position of the steel jacket box through a seventh winch, an eighth winch, a ninth winch, a tenth winch and a third winch;
2) when the steel jacket box sinks to a position 30-50 cm away from the top of the foundation bed, stopping water injection, remeasuring the plane position of the steel jacket box, adjusting the position of the steel jacket box by connecting the steel jacket box with a seventh winch, an eighth winch, a ninth winch, a tenth winch and a third winch, continuing water injection sinking, and monitoring and adjusting the position of the steel jacket box;
3) stopping water injection when the bottom of the steel pouring jacket sinks to be 20-30 cm away from the top of the foundation bed, measuring the plane position of the steel pouring jacket again, accelerating water injection after the design requirement is met, and enabling the steel pouring jacket to be located on the top of the foundation bed;
4) measuring the plane position of the steel pouring jacket, if the plane position of the steel pouring jacket is unqualified, pumping water in the water-proof bin to enable the steel pouring jacket to float upwards to a position 20cm away from the top of the foundation bed, readjusting the plane position of the steel pouring jacket until the plane position meets the requirement, and then continuing injecting water into the water-proof bin to enable the steel pouring jacket to sink;
5) after the steel pouring jacket is installed, water is continuously injected into the water-resisting bin until the water-resisting bin is full, the plane position and the elevation of the steel pouring jacket are continuously measured in the water injection process until the steel pouring jacket is stable, the anchor cable is hung, tightened and fixed, and all water level holes in the steel pouring jacket are opened.
The mounting process of the steel jacket box for the construction of the bridge pier bearing platform is characterized in that when the steel jacket box is manufactured, the back cover supporting plate is formed by assembling 6 unit supporting plates, and the 6 unit supporting plates are hung on the third-layer plane frame and the wall body of the steel jacket box through a plurality of chain blocks.
In the installation process of the steel sleeve box for pier bearing platform construction, each row of the air bags comprises 6 long air bags and 5 short air bags clamped between every two long air bags, the diameters of the 6 long air bags and the diameters of the 5 short air bags are the same and are 1m, and the working height is 80 cm; the length of the long air bag is 12m, and the length of the short air bag is 5 m.
According to the installation process of the steel pouring jacket for the construction of the pier bearing platform, when the steel pouring jacket is launched, when the bottom sealing supporting plate cannot fall off, 1-2 m of water is added into the water resisting bin of the steel pouring jacket, close to the river side, of the wall plate along the bridge, so that the tail of the whole steel pouring jacket is tilted, and the bottom sealing supporting plate falls off in an unbalanced state of internal and external water pressure and a water head.
In the installation process of the steel pouring jacket for the construction of the pier bearing platform, when the step 3) of the positioning process of the steel pouring jacket is carried out, the upstream direction and the downstream direction of the steel pouring jacket are adjusted by the aid of a traffic ship.
According to the installation process of the steel pouring jacket for the construction of the pier bearing platform, when the steel pouring jacket sinks, RTK positioning measurement is adopted for measuring the plane position and the elevation of the steel pouring jacket.
The installation process of the steel pouring jacket for the construction of the pier bearing platform has the following characteristics: the steel sleeve box is supported by the air bag when the steel sleeve box is submerged, power is provided through the barge in the front, the two winches in the rear control the sliding speed, the steel sleeve box sequentially slides into the water from the splicing platform and the launching chute, the eight winches are adopted for traction and positioning after entering the water, and then water is injected into the wall plate cavity of the steel sleeve box, so that the steel sleeve box sinks in place. The installation process of the invention combines the landform of the bridge area and adopts the guide-frame-free winch to position the steel pouring jacket under the conditions of relatively slow water flow speed, relatively stable water level during construction and narrow river channel, well completes the positioning and sinking of the steel pouring jacket, does not influence navigation and construction operation, and has reasonable and simple arrangement of the winch, low construction cost and convenient operation.
Drawings
FIG. 1a is a plan view of a steel jacket box for pier cap construction according to an installation method of the present invention
Fig. 1b is an elevation view of a steel jacket box for pier cap construction according to the installation method of the present invention;
FIG. 2 is a plan view of an air bag employed in the installation method of the present invention;
FIG. 3 is a state diagram of a steel jacket box launching flow in the installation method of the present invention;
FIG. 4 is a state diagram of the completion of step 1) of the steel jacket box positioning process in the installation method of the present invention;
FIG. 5 is a state diagram of the completion of step 2) of the steel jacket box positioning process in the installation method of the present invention;
fig. 6 is a state diagram when step 3) of the steel jacket box positioning flow is completed in the installation method of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
Referring to fig. 1a and 1b, the steel jacket box related to the installation process of the steel jacket box for pier bearing platform construction of the present invention is rectangular and has a bottomless structure, the wall body of the steel jacket box 100 comprises two along-the-bridge wall plates 1, two cross-bridge wall plates 2 and an inner support, and the inner support comprises first to third layers of plane frames 61, 62 and 63; the width of the forward bridge wall plate 1 is smaller than that of the transverse bridge wall plate 2; the plane size of the steel pouring jacket 100 is 40.4m along the bridge width and 28.4m across the bridge width; the forward-direction wall plate 1 and the transverse-direction wall plate 2 are both of double-wall structures; the forward bridge wall plate 1 is divided into two horizontal waterproof bins through a bin division partition plate 10; the transverse bridge wall plate 2 is divided into three transverse waterproof bins through two bin-dividing partition plates 20; the forward-direction wallboard 1 and the transverse-direction wallboard 2 both comprise an inner panel, an outer panel, side plates and a bottom plate; two water level holes are respectively formed in the two sides of the inner panels of the two along-bridge wall plates 1 and the bin dividing partition plates at the same height; the middle part of the outer panel of the transverse bridge directional wall plate 1 on the river side and the two bin separation partition plates are respectively provided with a water level hole at the same height; two water level holes are respectively arranged at the same height on two bin dividing partition plates of the transverse bridge direction wall plate 1 at the bank side; the transverse bridge wall plate 1 at the river side is also provided with a connecting through hole.
The installation process of the steel pouring jacket for the construction of the pier bearing platform comprises the following procedures: excavating a foundation pit, flattening a foundation bed, manufacturing a steel sleeve box, preparing the steel sleeve box to launch, launching the steel sleeve box, positioning the steel sleeve box and sinking the steel sleeve box;
when the foundation pit excavation process is carried out, a method combining land excavation, water excavation and reef explosion is adopted; the inner edge of the foundation pit needs to enter the inner wall of the steel sleeve box by 1 m; the outer edge of the foundation pit transversely exceeds the outer wall of the steel tapping pouring jacket by 3m in the bridge direction, and the outer edge of the foundation pit exceeds the outer wall of the steel tapping pouring jacket by 2m in the bridge direction.
When the foundation bed leveling process is carried out, a leveling ship and a diver underwater leveling combined method is adopted, a crushed stone layer with the thickness of 50cm is laid on the foundation pit, the laying inner edge of the crushed stone layer enters the steel pouring jacket for 1m, and the laying outer edge of the crushed stone layer exceeds the outer wall of the steel pouring jacket for 2m, so that the foundation bed for mounting the steel pouring jacket is formed.
When the steel sleeve box manufacturing process is carried out, firstly, the steel sleeve box is segmented and processed in a factory, and then the steel sleeve box is transported to an assembling platform 200 to be assembled piece by piece, wherein the length of the assembling platform 200 is 40m, the assembling platform 200 is positioned on a river beach near the mounting position of a pier and is subjected to leveling and hardening treatment, the slope ratio is 1:30, and a rectangular steel buttress 200A which is matched with the plane size of the steel sleeve box and is horizontal is paved on the assembling platform 200; synchronously mounting a bottom sealing supporting plate when the wall body of the steel pouring jacket 100 is assembled; the bottom sealing supporting plate is formed by assembling 6 unit supporting plates, and the 6 unit supporting plates are hung on the third layer of plane frame 63 and the wall body of the steel box 100 through 34 chain blocks; after the wall body assembly of the steel sleeve box 100 is finished, internal support installation is carried out; the transverse bridge direction wall plate 2 of the assembled steel jacket box 100 is in a transverse water flow direction.
The preparation process for launching the steel jacket box comprises the following steps:
1) a launching chute 300 (with the length of 6m) with the slope ratio of 1:20 is leveled between the front edge of the assembly platform 200 and the river bank;
2) the first winches 101 and the second winches 102 are arranged at the rear 8m of the assembly platform 200 and are opposite to the pull lugs at the bottoms of the two sides of the rear end of the steel pouring jacket 100 in a one-to-one correspondence manner; the fourth winch 104 and the third winch 103 are correspondingly arranged on two sides of the assembly platform 200 one by one, and the sixth winch 106 and the fifth winch 105 are arranged on the opposite bank of the assembly platform 200; tenth hoisting machines 110 and ninth hoisting machines 109 are provided on both sides of the bed 400 in a one-to-one correspondence to the river bank, and eighth hoisting machines 108 and seventh hoisting machines 107 are provided on the opposite bank of the bed 400; a steel wire rope of the third winch 103 and a steel wire rope of the fourth winch 104 are respectively hung on the pull lugs at the bottoms of the two sides of the rear end of the steel sleeve box 100; a steel wire rope of the fifth winch 105 and a steel wire rope of the sixth winch 106 are respectively hung on the pull lugs at the bottoms of the two sides of the front end of the steel sleeve box 100;
3) two rows of air bags are arranged at the bottom of the steel jacket box 100 along the river bank, each air bag comprises 6 long air bags 201 and 5 short air bags 202 clamped between every two long air bags 201, the diameters of the 6 long air bags 201 and the diameters of the 5 short air bags 202 are the same and are 1m, and the working height is 80 cm; the length of the long air bag 201 is 12m, and the length of the short air bag 202 is 5 m; the two rows of air bags are connected through a thin steel wire rope 203 (see figure 2);
4) respectively hanging an auxiliary stay cable 301 connected with a barge on pull lugs at the bottoms of the two sides of the front end of the steel jacket box 100, respectively hanging a rear stay cable 302 on pull lugs at the bottoms of the two sides of the rear end of the steel jacket box 100, and respectively connecting the two rear stay cables 302 with the first winch 101 and the second winch 102 in a one-to-one correspondence manner through a cable breaker (see fig. 3); each cable breaker is connected with a pull cable hung on the crane;
5) firstly, inflating an air bag at the front end of the steel jacket box 100, jacking the steel jacket box 100 at the front end, then cutting off a steel buttress 200A at the front end of the steel jacket box 100, inflating the air bag at the tail part of the steel jacket box 100, and properly deflating the air bag at the front end of the steel jacket box 100, so that the tail part of the whole steel jacket box 100 is tilted to be in a balanced state, and then cutting off the rest of the steel buttress 200A; the sliding down of the steel jacket 100 is initiated while ensuring that all the bladders are at the same pressure.
When the steel jacket box is launched, the two rear guys 302 are slowly released through the first winch 101 and the second winch 102, the two auxiliary guys 301 provide power through the barge to enable the steel jacket box 100 to slowly slide along the gradient of the splicing platform 200, a connecting airbag is fed into the front end of the steel jacket box 100 in the sliding process until the steel jacket box 100 slides to a preset position (the front end of the steel jacket box 10 is 5m away from a river bank), the first winch 101 and the second winch 102 are closed, the two pull cables are lifted through the crane to enable the cable breaker to be unhooked, the two rear guys 302 are unhooked from the steel jacket box 100, the steel jacket box 100 freely accelerates and slides downwards on the launching slideway 300, and the steel jacket box 100 is flushed into water and slides into the river for a certain distance by utilizing the inertia of the steel jacket box 100; after the steel pouring jacket 100 completely enters water and is slowly stopped, the position of the steel pouring jacket 100 is adjusted through a third winch 103, a fourth winch 104, a fifth winch 105 and a sixth winch 106, so that the steel pouring jacket 100 enters a bottom plate removing area, bottom removing workers enter the steel pouring jacket 100 through a transportation ship, a chain block used for hanging a bottom sealing supporting plate in 34 steel pouring jackets 10 is quickly removed, and 6 unit supporting plates are synchronously placed; when the bottom sealing supporting plate can not fall off, 1-2 m of water is added into a water resisting bin of the steel jacket box 100, which is close to the river side and is along the bridge direction wall plate 1, so that the tail of the whole steel jacket box 100 is tilted, and the bottom sealing supporting plate falls off through the unbalanced state of internal and external water pressure and a water head.
The steel pouring jacket positioning process comprises the following steps:
1) firstly, respectively pulling and hanging the steel wire rope of the seventh winch 107 and the steel wire rope of the ninth winch 109 on the pull lugs at the tops of the two sides of the front end of the steel jacket box 100, and respectively pulling and hanging the steel wire rope of the eighth winch 108 and the steel wire rope of the tenth winch 110 on the pull lugs at the tops of the two sides of the rear end of the steel jacket box 100 (see fig. 4);
2) the operator slowly loosens the cables of the fourth winch 104, the fifth winch 105 and the sixth winch 106, slowly retracts the cables of the seventh winch 107, the ninth winch 109 and the tenth winch 110, and slowly adjusts the steel casing box 100 to the direction along the water flow of the cross-bridge wall plate 2 (see fig. 5);
3) firstly, removing the wire rope of the fifth winch 105 from the pull lug of the wire rope hanger of the tenth winch 110, and then removing the wire rope of the fourth winch 104 and the wire rope of the sixth winch 106; moving the steel jacket box 100 to the outer side of the foundation bed 400 through a seventh winch 107, an eighth winch 108, a ninth winch 109, a tenth winch 110, a third winch 103 and a fifth winch 105, adjusting the upstream and downstream directions of the steel jacket box 100 through the boosting of a traffic ship, and then detaching a steel wire rope of the fifth winch 105; the steel jacket 100 is slowly adjusted to the position of the bed 400 by the seventh hoist 107, the eighth hoist 108, the ninth hoist 109, the tenth hoist 110 and the third hoist 103 (see fig. 6);
the steel bushing box sinking process comprises the following steps:
1) synchronously injecting water into ten water-separation bins of the steel jacket box, monitoring the posture, the sinking elevation and the plane position of the steel jacket box at any time by using RTK (real time kinematic) in the water injection process, injecting water while adjusting the plane position of the steel jacket box by using a seventh winch, an eighth winch, a ninth winch, a tenth winch and a third winch;
2) when the steel jacket box sinks to a position 30-50 cm away from the top of the foundation bed, stopping water injection, adopting RTK to measure the plane position of the steel jacket box again, adjusting the position of the steel jacket box by connecting a seventh winch, an eighth winch, a ninth winch, a tenth winch and a third winch, continuing water injection sinking, and monitoring and adjusting the position of the steel jacket box;
3) stopping water injection when the bottom of the steel pouring jacket sinks to be 20-30 cm away from the top of the foundation bed, measuring the plane position of the steel pouring jacket again by using RTK (real-time kinematic) and accelerating water injection after the design requirement is met so that the steel pouring jacket is located on the top of the foundation bed;
4) measuring the plane position of the steel pouring jacket by using RTK (real-time kinematic), if the plane position of the steel pouring jacket is unqualified, pumping out water in the water-proof bin to enable the steel pouring jacket to float upwards to 20cm from the top of the foundation bed, readjusting the plane position of the steel pouring jacket until the plane position meets the requirement, and then continuing injecting water into the water-proof bin to enable the steel pouring jacket to sink;
5) after the steel pouring jacket is installed, water is continuously injected into the waterproof bin until the water is filled, the plane position and the elevation of the steel pouring jacket are continuously measured by the RTK in the water injection process, the anchor cable is hung and tensioned and fixed after the steel pouring jacket is stable, and then all water level holes in the steel pouring jacket are opened.
The installation process of the steel pouring jacket for the construction of the pier bearing platform has the following characteristics: the steel sleeve box is supported by the air bag when the steel sleeve box is submerged, power is provided through the barge in the front, the two winches in the rear control the sliding speed, the steel sleeve box sequentially slides into the water from the splicing platform and the launching chute, the eight winches are adopted for traction and positioning after entering the water, and then water is injected into the wall plate cavity of the steel sleeve box, so that the steel sleeve box sinks in place. The installation process of the invention combines the landform of the bridge area and adopts the guide-frame-free winch to position the steel pouring jacket under the conditions of relatively slow water flow speed, relatively stable water level during construction and narrow river channel, well completes the positioning and sinking of the steel pouring jacket, does not influence navigation and construction operation, and has reasonable and simple arrangement of the winch, low construction cost and convenient operation.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and therefore all equivalent technical solutions should also fall within the scope of the present invention, and should be defined by the claims.
Claims (6)
1. A mounting process of a steel pouring jacket for pier bearing platform construction is characterized in that the steel pouring jacket is rectangular and has a bottomless structure, and a wall body of the steel pouring jacket comprises two along-bridge wall plates, two transverse-bridge wall plates and an inner support; the width of the forward bridge wall plate is smaller than that of the transverse bridge wall plate; the forward-bridge wall plate and the transverse-bridge wall plate are both of double-wall structures; the forward bridge wall plate is divided into two horizontal waterproof bins through a bin separation plate; the transverse bridge wall plate is divided into three transverse waterproof bins through two bin-dividing partition plates; the forward-direction wallboard and the transverse-direction wallboard respectively comprise an inner panel, an outer panel, a side plate and a bottom plate; two sides of the inner panels of the two along-bridge wall plates and the bin dividing partition plates are respectively provided with a water level hole at the same height; the middle part of the outer panel of the transverse bridge direction wall plate on the river side and the two bin separation partition plates are respectively provided with a water level hole at the same height; two bin partition plates of the transverse bridge direction wall plate on the bank side are respectively provided with a water level hole at the same height; a connecting through hole is also formed in the transverse bridge wall plate on the river side; the inner support comprises first to third layers of planar frames; the method is characterized in that the installation process of the steel pouring jacket comprises the following steps: excavating a foundation pit, flattening a foundation bed, manufacturing a steel sleeve box, preparing the steel sleeve box to launch, launching the steel sleeve box, positioning the steel sleeve box and sinking the steel sleeve box;
when the foundation pit excavation process is carried out, a method combining land excavation, water excavation and reef explosion is adopted; the inner edge of the foundation pit needs to enter the inner wall of the steel sleeve box by 1 m; the outer edge of the foundation pit transversely exceeds the outer wall of the steel tapping pouring jacket by 3m in the bridge direction, and the outer edge of the foundation pit exceeds the outer wall of the steel tapping pouring jacket by 2m in the bridge direction;
when the foundation bed leveling process is carried out, a leveling ship and a diver underwater leveling combined method is adopted, a crushed stone layer with the thickness of 50cm is laid on a foundation pit, the laying inner edge of the crushed stone layer enters the steel pouring jacket for 1m, and the laying outer edge of the crushed stone layer exceeds the outer wall of the steel pouring jacket for 2m, so that a foundation bed for mounting the steel pouring jacket is formed;
when the steel sleeve box manufacturing process is carried out, firstly, the steel sleeve box is processed in a factory in sections and separated, then the steel sleeve box is transported to an assembling platform to be assembled section by section, the assembling platform is positioned on a river beach near the installation position of a pier and is subjected to leveling and hardening treatment, the slope ratio is 1:30, and steel buttresses which are adaptive to the plane size of the steel sleeve box and are horizontal are paved on the assembling platform; synchronously mounting a bottom sealing supporting plate when the wall body of the steel sleeve box is assembled; after the wall body of the steel sleeve box is assembled, internal support installation is carried out; the transverse bridge direction wall plate of the assembled steel pouring jacket is in a transverse water flow direction;
the preparation process for launching the steel jacket box comprises the following steps:
1) leveling a launching slideway with a slope ratio of 1:20 between the front edge of the assembly platform and the river bank;
2) the pull lugs at the bottoms of two sides of the rear end of the steel pouring jacket, which are opposite to the rear 8m of the splicing platform, are correspondingly provided with a first winch and a second winch one by one; the fourth winch and the third winch are arranged on two sides of the assembling platform in a one-to-one correspondence mode, and the sixth winch and the fifth winch are arranged on the opposite bank side of the assembling platform; tenth and ninth winches are arranged on the two sides of the bed in a one-to-one correspondence manner, and eighth and seventh winches are arranged on the opposite bank sides of the bed; a steel wire rope of the third winch and a steel wire rope of the fourth winch are respectively hung on the pull lugs at the bottoms of the two sides of the rear end of the steel sleeve box; a steel wire rope of the fifth winch and a steel wire rope of the sixth winch are respectively hung on the pull lugs at the bottoms of the two sides of the front end of the steel sleeve box;
3) two rows of air bags are arranged at the bottom of the steel sleeve box along the river bank and connected through a thin steel wire rope;
4) respectively hanging an auxiliary stay rope connected with the barge on the pull lugs at the bottoms of the two sides of the front end of the steel sleeve box, respectively hanging a rear stay rope on the pull lugs at the bottoms of the two sides of the rear end of the steel sleeve box, and respectively connecting the two rear stay ropes with the first winch and the second winch correspondingly through a cable breaker; each cable breaker is connected with a pull cable hung on the crane;
5) inflating an air bag positioned at the front end of the steel jacket box, jacking the steel jacket box at the front end, cutting off the steel buttress at the front end of the steel jacket box, properly deflating the air bag positioned at the front end of the steel jacket box while inflating the air bag positioned at the tail part of the steel jacket box, and cutting off the rest steel buttress after the tail part of the whole steel jacket box tilts to be in a balanced state; sliding the steel sleeve box downwards under the condition of ensuring that all the air bags are in the same air pressure state;
when a steel jacket box launching process is carried out, two rear pull ropes are slowly released through a first winch and a second winch, the two auxiliary pull ropes provide power through a barge to enable the steel jacket box to slowly slide along the gradient of an assembly platform, a connection air bag is fed into the front end of the steel jacket box in the sliding process until the steel jacket box slides to a preset position, the first winch and the second winch are closed, two lifting pull ropes of a crane are used for unhooking a cable breaker, the two rear pull ropes are unhooked from the steel jacket box, the steel jacket box freely accelerates to slide downwards on a launching slideway, and the steel jacket box is flushed into water and slides for a certain distance into a river by utilizing the inertia of the steel jacket box; after the steel jacket box completely enters water and is slowly stopped, the position of the steel jacket box is adjusted through a third winch, a fourth winch, a fifth winch and a sixth winch to enable the steel jacket box to enter a bottom plate removing area, a bottom removing worker enters the steel jacket box through a transport ship, and a bottom sealing supporting plate hung on the steel jacket box is quickly removed;
the steel pouring jacket positioning process comprises the following steps:
1) respectively pulling and hanging a steel wire rope of a seventh winch and a steel wire rope of a ninth winch on pull lugs at the tops of the two sides of the front end of the steel jacket box, and respectively pulling and hanging a steel wire rope of an eighth winch and a steel wire rope of a tenth winch on pull lugs at the tops of the two sides of the rear end of the steel jacket box;
2) an operator slowly loosens the cables of the fourth winch, the fifth winch and the sixth winch, slowly retracts the cables of the seventh winch, the ninth winch and the tenth winch, and slowly adjusts the steel sleeve box to a position where the transverse bridge wall plate is in the direction along the water flow;
3) firstly, removing a steel wire rope of a fifth winch from a pull lug of a steel wire rope hanger of a tenth winch, and then removing a steel wire rope of a fourth winch and a steel wire rope of a sixth winch; moving the steel jacket box to the outer side of the position of the foundation bed through a seventh winch, an eighth winch, a ninth winch, a tenth winch, a third winch and a fifth winch, and then dismantling a steel wire rope of the fifth winch; slowly adjusting the steel jacket box to the position of the foundation bed through a seventh winch, an eighth winch, a ninth winch, a tenth winch and a third winch;
the steel bushing box sinking process comprises the following steps:
1) synchronously injecting water into ten water-separation bins of the steel jacket box, monitoring the posture, the sinking elevation and the plane position of the steel jacket box at any time in the water injection process, injecting water while adjusting the plane position of the steel jacket box through a seventh winch, an eighth winch, a ninth winch, a tenth winch and a third winch;
2) when the steel jacket box sinks to a position 30-50 cm away from the top of the foundation bed, stopping water injection, remeasuring the plane position of the steel jacket box, adjusting the position of the steel jacket box by connecting the steel jacket box with a seventh winch, an eighth winch, a ninth winch, a tenth winch and a third winch, continuing water injection sinking, and monitoring and adjusting the position of the steel jacket box;
3) stopping water injection when the bottom of the steel pouring jacket sinks to be 20-30 cm away from the top of the foundation bed, measuring the plane position of the steel pouring jacket again, accelerating water injection after the design requirement is met, and enabling the steel pouring jacket to be located on the top of the foundation bed;
4) measuring the plane position of the steel pouring jacket, if the plane position of the steel pouring jacket is unqualified, pumping water in the water-proof bin to enable the steel pouring jacket to float upwards to a position 20cm away from the top of the foundation bed, readjusting the plane position of the steel pouring jacket until the plane position meets the requirement, and then continuing injecting water into the water-proof bin to enable the steel pouring jacket to sink;
5) after the steel pouring jacket is installed, water is continuously injected into the water-resisting bin until the water-resisting bin is full, the plane position and the elevation of the steel pouring jacket are continuously measured in the water injection process until the steel pouring jacket is stable, the anchor cable is hung, tightened and fixed, and all water level holes in the steel pouring jacket are opened.
2. The installation process of the steel pouring jacket for pier bearing platform construction according to claim 1, wherein during the steel pouring jacket manufacturing process, the back cover supporting plate is assembled by 6 unit supporting plates, and the 6 unit supporting plates are hung on the third layer of the plane frame and the wall body of the steel pouring jacket through a plurality of chain blocks.
3. The installation process of the steel pouring jacket for pier cap construction according to claim 1, wherein each row of the air bags comprises 6 long air bags and 5 short air bags clamped between every two long air bags, the diameter of each of the 6 long air bags and the diameter of each of the 5 short air bags are the same and are 1m, and the working height is 80 cm; the length of the long air bag is 12m, and the length of the short air bag is 5 m.
4. The installation process of the steel pouring jacket for pier cap construction according to claim 1, wherein during a steel pouring jacket launching process, when the bottom sealing supporting plate cannot fall off, 1-2 m of water is added into a water resisting bin of a wall plate along a bridge on the side of the steel pouring jacket close to a river, so that the tail of the whole steel pouring jacket is tilted, and the bottom sealing supporting plate falls off in an unbalanced state of internal and external water pressure and a water head.
5. The installation process of the steel pouring jacket for pier cap construction according to claim 1, wherein the upstream and downstream directions of the steel pouring jacket are adjusted by means of a transportation vessel boost at the time of the step 3) of the steel pouring jacket positioning process.
6. The installation process of the steel pouring jacket for pier cap construction according to claim 1, wherein the planar position and elevation of the steel pouring jacket are measured by RTK positioning measurement during the steel pouring jacket sinking process.
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| CN102251530B (en) * | 2011-04-27 | 2012-10-03 | 中铁二十局集团第二工程有限公司 | Construction process of double-wall steel cofferdam for construction of pier bearing platform in main river water of Yellow River |
| CN102720140B (en) * | 2012-07-12 | 2015-03-25 | 中铁二十局集团第一工程有限公司 | Large-span prestress concrete continuous beam deepwater pier construction process |
| CN102852152B (en) * | 2012-09-29 | 2014-05-07 | 中铁八局集团第一工程有限公司 | Launching construction method of steel cofferdam suitable for shallow water area |
| CN108505529A (en) * | 2018-04-20 | 2018-09-07 | 中交第三航务工程局有限公司 | A kind of construction method of the bearing platform construction steel cofferdam of Through Steel case arch bridge |
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Address after: 200032 No. 139, Xuhui District, Shanghai, Pingjiang Road Patentee after: CCCC THIRD HARBOR ENGINEERING Co.,Ltd. Patentee after: CCCC Third Aviation Bureau Sixth Engineering (Xiamen) Co., Ltd. Patentee after: XIAMEN BRANCH OF CCCC THIRD HARBOR ENGINEERING Co.,Ltd. Address before: 200032 No. 139, Xuhui District, Shanghai, Pingjiang Road Patentee before: CCCC THIRD HARBOR ENGINEERING Co.,Ltd. Patentee before: CCCC Sanya (Xiamen) Engineering Co.,Ltd. Patentee before: XIAMEN BRANCH OF CCCC THIRD HARBOR ENGINEERING Co.,Ltd. |
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