CN210031875U - Open caisson device for pushing - Google Patents
Open caisson device for pushing Download PDFInfo
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- CN210031875U CN210031875U CN201920308825.8U CN201920308825U CN210031875U CN 210031875 U CN210031875 U CN 210031875U CN 201920308825 U CN201920308825 U CN 201920308825U CN 210031875 U CN210031875 U CN 210031875U
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Abstract
The utility model discloses a top pushes away uses open caisson device. The open caisson device for pushing comprises a square open caisson body, four corners of the upper portion of the square open caisson body are respectively provided with a pushing corner beam, four uplift piles are fixedly arranged at four corners inside the square open caisson body, the positions of the uplift piles correspond to the pushing corner beams one by one, a pushing device is arranged on each pushing corner beam, a force transmission connecting piece is arranged at the top of each uplift pile, each uplift pile is connected with each pushing corner beam and each pushing device through a steel strand, the pushing thrust of each pushing device is transmitted to each uplift pile through each pushing corner beam and each force transmission connecting piece in sequence, and each uplift pile provides counter force to realize open caisson sinking. The utility model discloses a component that the device is constituteed is the existing finished product of technology maturity basically, makes things convenient for the application and promotes, adopts the utility model discloses a device construction, its construction process easy operation, workman easily master, construction speed are fast, and have better economic benefits and social. The method is particularly suitable for open caisson construction in weak sandy soil areas and in complex surrounding environments.
Description
Technical Field
The utility model belongs to the technical field of the construction, concretely relates to top pushes away uses open caisson device.
Background
With the advance of urbanization process, cities all over the country need to build a large amount of underground pipelines, and a plurality of pipeline connecting wells are arranged beside a building, so that the excavation depth is large, and the environment is complex. The construction difficulty is high, a large amount of cost is often invested, and the damage to surrounding buildings is still difficult to avoid.
The open caisson is a construction mode for excavating a well with larger depth, and is characterized in that the wall of the open caisson is manufactured firstly, then the open caisson is excavated and sunk, and after reaching the design elevation, a bottom plate is constructed to finish the construction. The sinking principle is that the self weight of the open caisson is utilized to overcome the resistance of the well wall, the soil body in the well needs to be dug out first, the wall resistance is reduced, and then the open caisson sinks by self weight. In the process of digging out the soil mass in the well, the stability of water and soil outside the well is difficult to guarantee, and the soil mass around the open caisson runs off and sinks, thereby causing the damage of surrounding buildings, roads and underground pipelines. The risk of instability and inclination of the open caisson exists in the construction process. In order to meet the requirement of urban construction for rapid development, a good method is needed to be adopted for open caisson construction at a position with poor geological conditions and high environmental requirements, so that the requirements of protecting the safety of buildings around the open caisson and enhancing the safety and stability of open caisson construction are met.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned problem that exists among the prior art, the utility model aims to provide a top pushes away uses open caisson device. The open caisson construction method can solve the problems of large investment, large environmental hazard, poor sinking stability and the like in the existing open caisson construction, and is particularly suitable for open caisson construction in places with poor geological conditions and high environmental requirements.
The open caisson device for pushing comprises a square open caisson body and is characterized in that four corners of the upper portion of the square open caisson body are respectively provided with a pushing angle beam, four uplift piles are fixedly arranged at four corners inside the square open caisson body, the uplift piles are in one-to-one correspondence with the pushing angle beams from top to bottom, a pushing device is arranged on each pushing angle beam, a force transmission connecting piece is arranged at the top of each uplift pile, each uplift pile is connected with each pushing angle beam and each pushing device through a steel strand, the pushing thrust of each pushing device is transmitted to each uplift pile through each pushing angle beam and each force transmission connecting piece in sequence, and each uplift pile provides counter force to realize open caisson sinking.
The open caisson device for pushing is characterized in that the pushing device comprises a pushing anchorage device, a penetrating jack and ejector irons, the ejector irons are arranged between the penetrating jack and the pushing angle beam, the upper end of each steel strand sequentially penetrates through the pushing angle beam, the ejector irons and the penetrating jack from bottom to top, and the end head of each steel strand is fixed to the upper portion of the penetrating jack through the pushing anchorage device.
The open caisson device for pushing is characterized in that the force transmission connecting piece comprises an upper anchorage device, an anchor plate, a lower anchorage device and a pulling-resistant reinforcing steel bar, wherein the lower end part of the steel strand penetrates through the anchor plate and then is fixed by the lower anchorage device; the upper end part of the uplift steel bar penetrates through the anchor plate and then is fixed by the upper anchorage device, and the lower end part of the uplift steel bar is fixedly connected with the uplift pile.
The open caisson device for pushing is characterized in that the thickness of the top iron is 0.2m, and the number of the top irons is 1-5.
The open caisson device for pushing is characterized in that the anchor plate is of a round porous steel plate structure.
The construction method of the open caisson device for pushing is characterized by comprising the following steps:
1) the construction method comprises the following steps of (1) preparing familiar design drawings in construction, knowing engineering implementation environment, investigating the current situation of the open caisson, cleaning a field site, hardening the ground, comprehensively checking materials, mechanical equipment and the like entering the field, and putting the open caisson into use after the inspection is qualified;
2) the uplift pile construction uplift pile is a cast-in-situ bored pile, and the construction steps are as follows in sequence: positioning by a drilling machine, punching, cleaning holes, manufacturing a reinforcement cage, putting the reinforcement cage down and pouring underwater concrete;
3) excavating a foundation trench made of the open caisson, wherein the excavation depth is 2 meters, and removing miscellaneous filling soil;
4) constructing a blade foot cushion layer, namely calculating and determining the thickness of a sand cushion layer according to the calculation standard, paving the sand cushion layer, compacting and then paving a concrete cushion layer;
5) manufacturing an open caisson structure section by section, erecting a steel pipe support, binding reinforcing steel bars, erecting a template, and pouring concrete; after the pouring is finished, covering, moisturizing and maintaining the concrete to obtain a square open caisson body;
6) erecting operating platforms, namely installing four open caisson pushing operating platforms at the tops of the pushing corner beams, wherein the four open caisson pushing operating platforms are respectively positioned at four corners of the open caisson;
7) removing the template and the template in the step 5), cleaning the surface of the open caisson structure, and removing the steel pipe supports on the inner side and the outer side of the open caisson;
8) installing a pushing device and a force transmission connecting piece to break the pile head of the uplift pile prepared in the step 2), adjusting the pile top steel bar, fixedly installing the lower end of the uplift steel bar of the force transmission connecting piece on the pile top steel bar, fixing the upper end of the uplift steel bar on the anchoring plate through an upper anchorage device, and connecting the lower end of the steel strand with the force transmission connecting piece and fixing the steel strand on the anchoring plate through a lower anchorage device; the center-penetrating jack is installed on the pushing angle beam, and the upper end of the steel strand penetrates through the pushing angle beam and the center-penetrating jack and is fixed through the pushing anchor;
9) clearing the cutting edge concrete cushion layers in the step 4), manually breaking the inner and outer cutting edge concrete cushion layers of the open caisson, cleaning the inner and outer cutting edge concrete cushion layers, and symmetrically breaking the inner and outer cutting edge concrete cushion layers at corners and in the middle of the open caisson at first;
10) starting a pushing device to push and sink, synchronously starting penetrating jacks at four corners, arranging a leveling observation point on each pushing corner beam, observing the horizontal elevation of the open caisson by using a level gauge in the pushing process, and timely adjusting the jacking force of the penetrating jacks at corresponding positions according to the elevation change of the open caisson, wherein the jacking speed of the jacks is 0.8-1.2cm/min, preferably 1 cm/min;
11) adding top iron for continuous jacking, after one stroke is finished, recovering oil and withdrawing the jack, adding one piece of top iron for continuous jacking under the center-penetrating jack, and circulating for five times;
12) after the top iron is added to 1.0 m in height, the back-tight anchorage device is used for continuous jacking, namely after the last cycle is finished, oil is collected and the top is removed, the top-tight anchorage device is loosened, the top iron is drawn out and adjusted, and the top-tight anchorage device is moved downwards to the head part of the jack; repeating the step 11) until the sinking height of the first section of the open caisson is finished;
13) after sinking of the first section of the sinking well, the soil in the sinking well is cut in layers by adopting a high-pressure water gun and is crushed into slurry, then the soil in the sinking well is flushed and transported out by using a slurry pump, the water level in the sinking well is kept 0.5 m above the underground water during flushing and sucking, and the thickness of the flushing and sucking soil is 0.5 m less than the sinking depth of the first section; in the soil mass flushing and sucking process, continuously repeating the steps 10) -12) until the open caisson sinks to the designed elevation;
14) and (4) removing the pushing device for the bottom sealing of the open caisson, continuously flushing and sucking the soil body in the open caisson, sealing the bottom with underwater concrete after reaching the designed height, and finishing the sinking construction of the open caisson.
The construction method of the open caisson device for pushing is characterized in that the sand cushion in the step 4) is 0.4-0.6 meter thick and 2.8-3.2 meters wide, preferably 0.5 meter thick and 3.0 meters wide; the concrete pad has a thickness of 0.08-0.12 m and a width of 2.8-3.2 m, preferably a thickness of 0.1 m and a width of 3.0 m.
The construction method of the open caisson device for pushing is characterized in that in the step 5), during the manufacturing of the square open caisson body in sections, the manufacturing height of each section is 5-6 m; the open caisson pushing operation platform in the step 6) is of a square structure with the side length of 2 meters and is made of angle steel, a wood plate is paved at the bottom of the open caisson pushing operation platform, railings are arranged on the periphery of the open caisson pushing operation platform, and the height of the railings is 1.2 meters.
The construction method of the open caisson device for pushing is characterized in that in the step 11), one stroke is 0.25 meter.
The construction method of the open caisson device for pushing is characterized in that the sinking height of the first section of the open caisson in the step 12) is 2.8-3.2 meters, and preferably 3 meters.
Through adopting above-mentioned technique, compare with prior art, the beneficial effects of the utility model are as above:
1) the utility model discloses an adopt limited top to push and use the open caisson device, provide the jacking force for the anti-floating pile by the center-penetrating jack, provide the top pushing counter-force that the open caisson sinks by the anti-floating pile again, anti-floating pile body construction equipment is pile driver commonly used, its technology is mature, the technique is reliable, adopt the biography power connecting piece to connect anti-floating pile and top-penetrating device, the requirement that the pile body resistance to plucking is big has been satisfied, make the pile top connect reliably, it is little to the open caisson sinking interference, improve its efficiency of construction that sinks, the steel strand wires, haplopore ground tackle, the clamping piece, the center-penetrating jack that constitute the power transmission device in the device are general standard pieces, the technology is mature, the mechanical index is clear, easily purchase, convenient to use;
2) in the force transmission connecting piece of the utility model, the anchor plate adopts a round porous steel plate structure, which can meet the requirements of convenient installation and reliable force transmission; the pushing device of the utility model is arranged on the pushing angle beam, the pushing force for sinking the open caisson is provided by the pushing angle beam, the bearing capacity of the angle beam is large, the jack arranged on the top of the angle beam is stable, the angle beam can be used as a pushing operation platform, and the safety protection device is reliable;
3) the utility model discloses a set up the bored concrete pile as the anti-floating pile in the open caisson, in the open caisson sinking process, utilize the counter-force that the bored concrete pile provided, sink through facilities such as jack and provide top thrust for the open caisson, make the open caisson steadily sink under thrust and dead weight combined action; during construction, the open caisson is sunk firstly and then is subjected to soil taking, the soil is taken after the open caisson is sunk for one section each time, and the process is circulated until the open caisson is sunk to the designed elevation. The pressure of water and soil inside the open caisson is always kept to be greater than that of water and soil outside the open caisson during construction, so that the potential safety hazard of peripheral soil body sedimentation caused by open caisson sinking construction is eliminated, and buildings around the open caisson are protected. The construction process is simple to operate, easy to master by workers, high in construction speed and good in economic benefit and social benefit. The components formed by the device are basically the existing finished products with mature processes, and are convenient to apply and popularize. The method is particularly suitable for open caisson construction in weak sandy soil areas and in complex surrounding environments.
Drawings
Fig. 1 is a schematic structural plan view of the present invention;
FIG. 2 is a schematic structural section of the present invention;
FIG. 3 is a schematic view of the connection structure of the pushing device of the present invention;
fig. 4 is the schematic view of the force transmission connecting member connection structure of the present invention.
In the figure: the method comprises the following steps of 1-jacking device, 101-jacking anchor, 102-piercing jack, 103-top iron, 2-jacking corner beam, 3-steel strand, 4-square open caisson body, 5-force transmission connector, 501-upper anchor, 502-anchor plate, 503-lower anchor, 504-uplift steel bar, 6-uplift pile and 7-open caisson jacking operation platform.
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited thereto:
as shown in fig. 1-4, the utility model discloses a top pushes away uses open caisson device, including square open caisson body 4, the upper portion four corners of square open caisson body 4 sets up respectively and pushes away angle beam 2, and the inside four corners rigidity of square open caisson body 4 is equipped with four anti-floating piles 6, anti-floating pile 6 position and top of pushing away angle beam 2 one-to-one, be equipped with thrustor 1 on the top of pushing away angle beam 2, anti-floating pile 6 top is equipped with biography power connecting piece 5, and anti-floating pile 6 passes through steel strand wires 3 with pushing away angle beam 2, thrustor 1 and is connected, and the top pushing of thrustor 1 pushes away thrust and loops through pushing away angle beam 2 and biography power connecting piece 5 and passes through anti-floating pile 6, and anti-floating pile 6 provides the counter.
As shown in fig. 3, the utility model discloses a thrustor 1 is including pushing away ground tackle 101, punching jack 102 and top iron 103, top iron 103 is a plurality of, the setting is between punching jack 102 and the top pushes away angle beam 2, 3 upper ends of steel strand wires are from supreme top of passing in proper order down and push away angle beam 2, top iron 103 and punching jack 102, the end is fixed on punching jack 102 upper portion through pushing away ground tackle 101, top iron 103 thickness is 0.2m, the number of top iron 103 is 1-5, punching jack 102 pushes away upwards, the thrust of production, transmit through top iron 103 and push away angle beam 2, the counter thrust that the top pushes away angle beam 2 and produce passes for the open caisson again, thereby help to push away the open caisson sinking.
As shown in fig. 4, the force-transferring connector 5 of the present invention comprises an upper anchor 501, an anchor plate 502, a lower anchor 503 and a pulling-resistant reinforcement 504, wherein the lower end of the steel strand 3 is fixed by the lower anchor 503 after passing through the anchor plate 502; go up ground tackle 501 fixed after uplift reinforcing bar 504 upper end tip passes anchor plate 502, lower extreme tip and uplift pile 6 fixed connection, the utility model discloses used anchor plate 502 can satisfy simple to operate, pass the reliable requirement of power for circular porous steel plate structure, and steel strand wires 6 produces the pulling force that makes progress under the effect of punching jack 102, transmits for uplift pile 6 through anchor plate 503.
The construction method of the open caisson device for pushing comprises the following steps:
1) the construction method comprises the following steps of (1) preparing familiar design drawings in construction, knowing engineering implementation environment, investigating the current situation of the open caisson, cleaning a field site, hardening the ground, comprehensively checking materials, mechanical equipment and the like entering the field, and putting the open caisson into use after the materials, the mechanical equipment and the like are checked to be qualified;
2) the method comprises the following steps of (1) construction of a bored pile, positioning of a drilling machine, punching, hole cleaning, manufacturing of a reinforcement cage, laying of the reinforcement cage, and pouring of underwater concrete;
3) excavating a foundation trench made of the open caisson, wherein the excavation depth is 2 meters, and removing miscellaneous filling soil;
4) and constructing a blade foot cushion, determining the thickness of the sand cushion according to calculation, paving the sand cushion, compacting, and paving a concrete cushion, wherein the thickness is generally 0.5 meter, and the width is 3.0 meters, and the thickness is generally 0.1 meter, and the width is 3.0 meters.
5) Manufacturing an open caisson structure in sections, erecting a support, binding reinforcing steel bars, erecting a template and pouring concrete; keeping test blocks under the same conditions and standard maintenance test blocks according to the standard requirements in the pouring process, and covering, moisturizing and maintaining the concrete after pouring is finished; the manufacturing height of each section is 5-6 m.
6) Erecting operating platforms, namely installing four open caisson pushing operating platforms 7 at the tops of the pushing corner beams, wherein the four open caisson pushing operating platforms are respectively positioned at four corners of the open caisson; the open caisson pushing operation platform 7 is made of angle steel, is square, 2 meters in side length, is paved with wood plates at the bottom, is provided with railings at the periphery, is provided with a pushing device with the height of 1.2 meters, breaks a bored cast-in-place pile head, adjusts the steel bars of the pile top, installs a steel strand connecting piece on the pile top, installs a penetrating jack on a pushing angle beam, and is connected with the penetrating jack through an upper anchorage device and a lower anchorage device after penetrating through the connecting piece;
7) removing the template and the template in the step 5), cleaning the surface of the open caisson structure, and removing the steel pipe supports on the inner side and the outer side of the open caisson;
8) installing a pushing device 1 and a force transmission connecting piece 5 to break the pile head of the uplift pile 6 prepared in the step 2, adjusting pile top steel bars, fixedly installing the lower ends of the uplift steel bars 504 of the force transmission connecting piece 5 on the pile top steel bars, fixing the upper ends of the uplift steel bars 504 on an anchor plate 502 through an upper anchor device 1, and simultaneously connecting the lower ends of the steel strands 3 with the force transmission connecting piece 5 and fixing the steel strands on the anchor plate 502 through a lower anchor device 503; the penetrating jack 102 is installed on the pushing angle beam 2, and the upper end of the steel strand 3 penetrates through the pushing angle beam 2 and the penetrating jack 102 and is fixed through the pushing anchor 101;
9) and removing the concrete cushion of the blade leg, manually breaking the concrete cushion of the blade leg inside and outside the open caisson, cleaning the concrete cushion, and symmetrically breaking the concrete cushion in the open caisson in a way of turning the corner first and then in the middle outside the open caisson.
10) Starting a pushing device 1 to push and sink, synchronously starting penetrating jacks 102 at four corners, arranging a leveling observation point on each pushing corner beam, observing the horizontal elevation of the open caisson by using a level gauge in the pushing process, and timely adjusting the jacking force of the penetrating jacks 102 at corresponding positions according to the elevation change of the open caisson, wherein the jacking speed of the jacks is 0.8-1.2cm/min, preferably 1 cm/min;
11) and (3) adding top iron to continue jacking, after one stroke (0.25 m) is finished, recovering oil and withdrawing the jack, adding top iron (0.2 m thick) to the upper end of the jack and then jacking, and repeating the steps for five times.
12) After the top iron is added to 1.0 m in height, the top of the back-tight anchorage device is replaced by the back-tight anchorage device, namely after the last cycle is finished, oil is collected and the top is removed, the top-push anchorage device 101 is loosened, the top iron 103 is drawn out, and the top-push anchorage device 101 is moved downwards to the head part of the jack; repeating the step 11 until the sinking height of the first section of the open caisson is finished;
13) and (3) flushing and sucking the soil body in the open caisson, after the first section of the open caisson sinks, flushing and sucking the soil body in the open caisson by adopting a flushing and sucking device, and transporting the soil body out, wherein the water level in the open caisson is kept 0.5 m above the underground water during flushing and sucking, and the thickness of the flushing and sucking soil body is less than 0.5 m of the sinking depth of the first section. In the soil mass flushing and sucking process, continuously repeating the steps 10-12 until the open caisson sinks to the designed elevation;
14) and (4) sealing the bottom of the open caisson, removing the pushing device, continuously flushing and sucking the soil body in the open caisson to a designed height, and sealing the bottom with underwater concrete. And finishing the sinking construction of the open caisson.
Examples of the applications
Sinking construction of certain open caisson
One side of a certain open caisson is a river channel with the distance of 6m, one side of the open caisson is a building with the distance of 9m, the plane size is 10m multiplied by 10m, the structure height is 16m, the sinking depth is 15m, and the average thickness of the well wall is 0.6 m. The underground soil is silt soil.
The total project construction period is 90 calendar days, the project is started from 7 months to 11 days in 2018, the whole project amount is completed in 5 days in 10 months, and the actual construction period is 85 days. The manufacturing time of the open caisson is 68 days, the actual time of the open caisson is 17 days, and the total manufacturing cost is 95 thousands. The construction does not have adverse effect on the river channel, and no open caisson exists in the building. The construction quality meets the requirements of the national relevant acceptance and acceptance specifications, and the favorable comments of construction units and supervision units are obtained.
The open caisson is originally designed by adopting the enclosure construction of an enclosure structure, and in order to ensure the safety of a building, the construction of a riverway cofferdam is required, the cost of the enclosure structure is 92 thousands, the cost of the cofferdam is 70 thousands, the cost of riverway restoration is 45 thousands, and the total is 207 thousands. The cost of sinking is far more than 80 thousands of the cost of manufacturing the open caisson per se, and the construction period is at least 150 days.
The utility model discloses a set up the bored concrete pile in the open caisson, at the open caisson sinking in-process, utilize the counter-force that the bored concrete pile provided, provide top thrust for the open caisson sinks through facilities such as jack for the open caisson steadily sinks under thrust and dead weight combined action. The open caisson is sunk firstly and then is subjected to soil taking, soil taking is carried out after the open caisson is sunk for one section each time, and the process is circulated until the open caisson is sunk to the designed elevation. The pressure of water and soil inside the open caisson is always kept to be greater than that of water and soil outside the open caisson during construction, so that the potential safety hazard of peripheral soil body sedimentation caused by open caisson sinking construction is eliminated, and buildings around the open caisson are protected. The construction process is simple to operate, easy to master by workers, high in construction speed and good in economic benefit and social benefit. The components formed by the device are basically the existing finished products with mature processes, and are convenient to apply and popularize. The method is particularly suitable for open caisson construction in weak sandy soil areas and in complex surrounding environments.
Claims (5)
1. Open caisson device for top pushes away, including square open caisson body (4), its characterized in that the upper portion four corners of square open caisson body (4) sets up respectively and pushes away angle beam (2), and the inside four corners rigidity of square open caisson body (4) is equipped with four anti-floating piles (6), anti-floating pile (6) position and top of pushing away angle beam (2) one-to-one, be equipped with thrustor (1) on pushing away angle beam (2), anti-floating pile (6) top is equipped with biography power connecting piece (5), and anti-floating pile (6) are connected through steel strand wires (3) with pushing away angle beam (2), thrustor (1), and the thrust that pushes away of thrustor (1) loops through pushing away angle beam (2) and biography power connecting piece (5) and passes for anti-floating pile (6), and anti-floating pile (6) provide the counter-force and realize that the open caisson sinks.
2. The open caisson device for pushing as recited in claim 1, wherein the pushing device (1) comprises a pushing anchor (101), a through jack (102) and a plurality of top irons (103), the top irons (103) are arranged between the through jack (102) and the pushing angle beam (2), the upper ends of the steel strands (3) sequentially penetrate through the pushing angle beam (2), the top irons (103) and the through jack (102) from bottom to top, and the ends of the steel strands are fixed on the upper part of the through jack (102) through the pushing anchor (101).
3. The jacking caisson device for pushing according to claim 1, wherein the force-transferring connector (5) comprises an upper anchorage (501), an anchor plate (502), a lower anchorage (503) and a pulling-resistant steel bar (504), and the lower end of the steel strand (3) is fixed by the lower anchorage (503) after passing through the anchor plate (502); the upper end part of the uplift steel bar (504) penetrates through the anchor plate (502) and then is fixed by the upper anchor (501), and the lower end part is fixedly connected with the uplift pile (6).
4. The open caisson device for incremental launching as claimed in claim 2, wherein the thickness of the top iron (103) is 0.2m, and the number of the top irons (103) is 1-5.
5. The jacking caisson installation for use in connection with claim 3, wherein said anchor plate (502) is of round cellular steel plate construction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920308825.8U CN210031875U (en) | 2019-03-12 | 2019-03-12 | Open caisson device for pushing |
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| CN201920308825.8U CN210031875U (en) | 2019-03-12 | 2019-03-12 | Open caisson device for pushing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109972644A (en) * | 2019-03-12 | 2019-07-05 | 杭州市市政工程集团有限公司 | Pushing tow open caisson device and its construction method |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109972644A (en) * | 2019-03-12 | 2019-07-05 | 杭州市市政工程集团有限公司 | Pushing tow open caisson device and its construction method |
| CN109972644B (en) * | 2019-03-12 | 2024-02-23 | 杭州市市政工程集团有限公司 | Open caisson device for pushing and construction method thereof |
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