CN110777845A - Reinforced sliding plate, support replacing system and construction method for underpass operation railway - Google Patents
Reinforced sliding plate, support replacing system and construction method for underpass operation railway Download PDFInfo
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- CN110777845A CN110777845A CN201911000962.6A CN201911000962A CN110777845A CN 110777845 A CN110777845 A CN 110777845A CN 201911000962 A CN201911000962 A CN 201911000962A CN 110777845 A CN110777845 A CN 110777845A
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- 238000010276 construction Methods 0.000 title claims abstract description 41
- 230000000903 blocking effect Effects 0.000 claims abstract description 41
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 11
- 230000007246 mechanism Effects 0.000 claims description 25
- 239000004568 cement Substances 0.000 claims description 20
- 238000005553 drilling Methods 0.000 claims description 20
- 239000002689 soil Substances 0.000 claims description 12
- 239000011150 reinforced concrete Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 7
- 230000004308 accommodation Effects 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 4
- 230000036961 partial effect Effects 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000008569 process Effects 0.000 description 4
- 238000009412 basement excavation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000002452 interceptive effect Effects 0.000 description 1
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- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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Abstract
The application discloses construction method for reinforcing sliding plates, support changing systems and underpass operation railways, which comprises a plate body for supporting a jacking frame and a plurality of blocking and protecting pieces protruding out of the top surface of the plate body, wherein the plate body and the blocking and protecting pieces form an accommodating space for accommodating at least part of structures of the jacking frame, and one side, away from the jacking frame, of each blocking and protecting piece is provided with a support changing surface for contacting with a drilled pile wall blocking of each support changing system. The construction method for reinforcing the sliding plate, the support replacing system and the underpass operation railway has the advantage of small deformation of the operation railway.
Description
Technical Field
The application relates to civil engineering devices, in particular to a reinforced sliding plate, a support changing system and a construction method for underpass of an operation railway.
Background
At present, urban municipal roads penetrate through existing operation railways increasingly, the existing operation railways need to be penetrated through firstly, a jacking working pit is excavated, a jacking framework is prefabricated in the working pit, then the existing operation railways are erected, and the framework is jacked into the position below the existing operation railways by using jacks. When the working pit is excavated, the existing operation railway is not reinforced and overhead, so that the influence on the railway is large, and the excavation risk is large. The working pit is generally supported by a drilled pile and an inner support frame in the first period, and a jacking frame is added in the later period; however, since the jacking frame collides with the inner support frame, when the jacking frame is constructed under reverse working conditions, the inner support frame needs to be removed first, and support replacement processing needs to be performed before the inner support frame is removed. And because the jacking frame needs jacking in the later period, the bottom plate of the jacking frame cannot be used for replacing the support. The inner support frame is dismantled under the condition of not changing the support, so that the danger of a working pit is caused, the deformation of the existing operation railway is large, and the strict requirements of the specification and the railway department are difficult to meet.
Disclosure of Invention
In view of this, the embodiments of the present application are expected to provide a reinforced sliding plate, a support changing system, and a construction method for passing through an operating railway, so as to solve the problem of large deformation of the operating railway.
In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:
the utility model provides a trade reinforcing slide that props system for wear the construction of existing railway under the road, including be used for supporting the plate body that advances the frame and protrusion in a plurality of fender of plate body top surface protect the piece, the plate body and a plurality of keep off protect the piece and form and be used for holding advance the at least partial structure's of frame accommodation space, keep off and protect the piece and deviate from advance frame one side have be used for with trade the face that props of the drilling stake wall backstop contact of system.
Further, a plurality of the blocking and protecting pieces are arranged around the edge of the plate body.
Further, the blocking and protecting piece is connected to the outer side of the plate body in the horizontal direction, the bottom surface of the blocking and protecting piece is flush with the bottom surface of the plate body, and the top surface of the blocking and protecting piece protrudes out of the top surface of the plate body.
Further, the thickness of the side, close to the plate body, of the blocking and protecting piece is smaller than the thickness of the side, far away from the plate body, of the blocking and protecting piece.
Further, the blocking and protecting piece and the plate body are integrally formed.
Further, the plate body is of a reinforced concrete structure; and/or the retaining and protecting piece is of a reinforced concrete structure.
Furthermore, the plate body and the reinforcing steel bars of the blocking and protecting piece are transversely and longitudinally staggered.
A support replacing system for an operation railway comprises a drilling pile wall, a jacking frame, a jacking mechanism and any one of the reinforcing sliding plates, wherein the drilling pile wall is formed by a plurality of drilling piles fixed in an earth layer in parallel; it is a plurality of the carriage is enclosed into to the drilling pile wall, the carriage inner space is for working the hole, the reinforcing slide is located the bottom in work hole, the jacking frame support with sliding in the top surface of plate body, trade the holding surface with drilling pile wall backstop contact, the mechanism is used for the drive is advanced in the jacking frame motion.
Further, the first end of the jacking mechanism is connected with the drilled pile wall, and the second end of the jacking mechanism is connected with the jacking frame.
Further, the jacking mechanism is an oil cylinder, an air cylinder or a motor.
Further, trade and prop the system and still include a plurality of cement mixing stake, cement mixing stake encloses and establishes in the outside of carriage is in order to form cement mixing stake layer.
Further, the jacking frame comprises a body with a plurality of horizontal channels, and the end part of the body is connected with the second end of the jacking mechanism along the extending direction of the horizontal channels.
Further, the jacking frame is a reinforced concrete frame.
A construction method of a downward-crossing operation railway is applied to any one of the support changing systems, and comprises the following steps: driving the drilling piles into the soil layer to form a plurality of drilling pile walls, wherein the plurality of drilling pile walls form a support frame; preliminarily digging a working pit in the supporting frame until the top end of the drilled pile; constructing a crown beam and an inner support frame; continuing to dig a work pit in the support frame to a predetermined depth; placing the reinforced sliding plate into the bottom of a working pit, wherein the support changing surface is in backstop contact with the drilling pile; pouring a partial structure of the jacking frame on the plate body until the bottom of the inner support frame is reached; removing the inner supporting frame; pouring the top of the jacking frame to finish the construction of the jacking frame; erecting the jacking mechanism; removing the drilled pile wall along the movement path of the jacking frame, and removing part of the blocking and protecting parts along the movement path of the jacking frame; the jacking mechanism drives the jacking frame to move to the position below the operation railway so as to realize the downward passing of the operation railway.
Further, the construction method comprises the following steps of digging a working pit in the supporting frame to the top end of the bored pile preliminarily: and driving the cement mixing pile into the soil layer to form a cement mixing pile layer.
Further, the construction method comprises the following steps of digging a working pit in the supporting frame to the top end of the bored pile preliminarily: driving a vertical column pile into a soil layer to support the inner support frame; the construction method further comprises the following steps of pouring the top of the jacking frame, and before the construction of the jacking frame is completed: and removing the upright post pile.
Further, before the excavation of the working pit is continued to the preset depth in the supporting frame, the construction method further comprises the following steps: verifying whether the connection strength of the crown beam and the inner support frame reaches a design value of 70%; and if the design value is 70%, the step of continuously digging the working pit in the support frame till the preset depth is carried out.
Further, before the inner support frame is removed, the construction method further comprises the following steps: verifying whether the connection strength of the support changing surface and the drilled pile reaches a design value of 70%; and if 70 percent is reached, executing the step of dismantling the inner support frame.
The beneficial effects are that: compared with the prior art, the construction method for the reinforced sliding plate, the support replacing system and the running railway through the running railway is characterized in that the reinforced sliding plate is arranged, the reinforced sliding plate comprises a plate body and a plurality of blocking and protecting pieces protruding out of the top surface of the plate body, one side, away from the jacking frame, of each blocking and protecting piece is provided with a support replacing surface used for being in blocking contact with a bored pile wall of the support replacing system, supporting of bored piles can be formed at the lower part through the support replacing surfaces, the bored piles are prevented from inclining, the jacking frame and subsequent construction are protected, and finally deformation of the periphery of the existing running railway and a working pit is reduced.
Drawings
Fig. 1 is a schematic structural view illustrating a construction process of a support changing system according to an embodiment of the present application, in which a component is pushed into a frame without completing the construction, and a support frame in the component is not removed;
FIG. 2 is a schematic cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic structural diagram of a support change system according to an embodiment of the present disclosure;
FIG. 4 is a schematic cross-sectional view B-B of FIG. 2;
FIG. 5 is a schematic view showing the connection relationship between the components, i.e., the bored pile, the plate body and the blocking and protecting member in the reinforced slide plate;
fig. 6 is a flowchart of a support changing method according to an embodiment of the present application.
Detailed Description
It should be noted that, in the case of conflict, the technical features in the examples and examples of the present application may be combined with each other, and the detailed description in the specific embodiments should be interpreted as an explanation of the present application and should not be construed as an improper limitation of the present application.
In the description of the embodiments of the present application, unless otherwise indicated, the "up," "down," "left," "right," "front," "back" orientations or positional relationships are based on the orientations or positional relationships illustrated in fig. 4, it is to be understood that these terms are merely used for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present application.
As shown in fig. 1 to 5, a support-changing system for construction of a run-through railway includes a bored pile wall 1 formed by a plurality of bored piles 11 fixed in a soil layer (not shown) side by side, a jacking frame 6, a jacking mechanism 7, and a reinforcing slide plate 3.
The reinforced sliding plate 3 includes a plate body 31 and a plurality of retainers 32 protruding from a top surface of the plate body 31, and the plate body 31 and the plurality of retainers 32 form an accommodation space 33 for accommodating at least a part of the structure of the jack-in frame 6, and in general, the accommodation space 33 may be formed by the plurality of retainers 32 around an edge of the plate body 31. The side of the blocking element 32 facing away from the top frame 6 has a support-changing surface 321 for blocking contact with the bored pile wall 1 of the support-changing system. The support-changing surface 321 forms support for the bored pile 11 at the lower part, prevents the bored pile from inclining, further prevents the working pit from collapsing and deforming, protects the jacking frame 6 and subsequent construction, and finally reduces deformation of the existing operation railway and the working pit in the construction process.
The bored pile 11 may be a cast-in-situ bored pile to provide support for a work pit (mentioned below). A plurality of drilling pile walls 1 enclose and establish into the carriage, and the carriage inner space is the work hole, and reinforcing slide 3 is located the bottom in work hole, pushes up frame 6 and supports on the top surface of plate body 31 with sliding, trades shoring face 321 and 11 backstop contacts of drilling pile, prevents the slope of drilling pile 11, reduces existing operation railway and the peripheral deformation in work hole.
The jacking mechanism 7 is used for driving the jacking frame 6 to move, so that the jacking frame 6 jacks towards the lower part of the operation railway to finish downward penetration. The jacking frame 6 comprises a body 62 having a plurality of horizontal channels 61, the horizontal channels 61 being available for the passage of vehicles after the underpass is completed. The jacking frame 6 is generally a reinforced concrete frame and has good bearing capacity.
In one possible embodiment, as shown in fig. 2, 4 and 5, the blocking and protecting member 32 is connected to the outer side of the plate body 31 in the horizontal direction, the bottom surface of the blocking and protecting member 32 is flush with the bottom surface of the plate body 31, and the top surface of the blocking and protecting member 32 protrudes from the top surface of the plate body 31, so that the blocking and protecting member 32 forms a convex edge with a certain thickness along the normal direction of the plate body 31, the thickness of the blocking and protecting member 32 is larger than that of the plate body 31, and the outer side surface of the blocking and protecting member 32 with a higher height is the support changing surface 321; the support changing surface 321 can reduce the height of the cantilever of the bored pile 11 after losing the support of the upper inner support frame 5, ensure the support at the lower part, protect the jacking frame 6, prevent the bored pile 11 from inclining, and reduce the deformation of the periphery of the existing operation railway and working pit. The cantilever height refers to the distance of the drilled pile 11 without a pivot point after penetrating out of the pit subsoil of the working pit.
In a possible embodiment, as shown in fig. 2, 4 and 5, the thickness of the side of the blocking element 32 close to the plate 31 is smaller than the thickness of the side of the blocking element away from the plate, for example, the blocking element 32 may have an approximately trapezoidal shape, the longer lower base of the blocking element 32 is a support changing surface 321 to provide support for the bored pile 11, and the shorter upper base of the blocking element 32 is integrally connected with the plate 31. After the bored pile 11 loses the upper inner support frame 5, the lower part of the bored pile 11 is stopped on the support changing surface 321 of the retaining member 32, is transmitted to the upper bottom of the retaining member 32 and then is transmitted to the plate body 31, so that the tilting movement trend of the bored pile 11 is converted into the horizontal movement trend of the plate body 31, the circumferential sides of the reinforced sliding plate 3 are stopped by the support frame, the plate body 31 bears the acting force from all directions, and the mutual balance ensures that the plate body 31 is static, thereby ensuring that the bored pile 11 does not tilt.
In one possible embodiment, the plate 31 is a reinforced concrete structure; the blocking and protecting piece 32 is of a reinforced concrete structure, has better pressure-bearing and tensile properties and low cost, and ensures that the rigidity of the sliding plate 3 is enhanced. When the reinforcing slide plate 3 is specifically arranged, the steel bars of the plate body 31 and the blocking and protecting piece 32 can be transversely and longitudinally staggered, acting force in all directions is improved, the plate body 31 and the blocking and protecting piece are directly tied up or welded to complete cement pouring, the thickness of the plate body 31 is properly thickened, and the thickness can be set to be not less than 40mm in actual engineering.
In a possible embodiment, the jacking mechanism 7 may be a cylinder, a cylinder or a motor, driving the jacking frame 6. Specifically, as shown in fig. 1 and 3, a first end of the jacking mechanism 7 is connected with the bored pile wall 1, and a second end of the jacking mechanism 7 is connected with the jacking frame 6, and it is understood that the extending direction of the horizontal channel 61 is generally consistent with the moving direction of the jacking frame 6, so that the end of the body 62 along the extending direction of the horizontal channel 61 can be connected with the second end of the jacking mechanism 7 to ensure that the force application point is of a solid structure.
In a possible embodiment, as shown in fig. 1 to 4, the support-changing system further includes a plurality of cement mixing piles 21, the cement mixing piles 21 are arranged around the outside of the support frame to form a cement mixing pile layer 2, so that cement soil piles with integrity, water stability and certain strength are formed, and the strength of the soft foundation soil layer is improved. The cement mixing pile 21 may be selected to be a single-shaft, double-shaft or three-shaft mixing pile according to the process requirements. The following provides an embodiment of a construction method of a underpass operation railway, as shown in fig. 1 to 6, including:
s10, driving the drilled piles 11 into the soil layer to form the drilled pile wall 1, and forming the supporting frame by the plurality of drilled pile walls 1.
And S20, primarily digging a working pit in the supporting frame until the top end of the bored pile 11.
S30, constructing the crown beams 4 and the inner supporting frames 5, wherein the crown beams 4 are arranged at the top end of the bored pile wall 1 and extend along the bored pile wall 1, and the inner supporting frames 5 are connected to at least two crown beams 4 and used as inner supports for the bored pile 11 to prevent overlong cantilevers from being formed. The inner support frame 5 can be of a reinforced concrete structure; the crown beam 4 can be of a reinforced concrete structure and has good bearing capacity.
S40, digging a work pit in the support frame to a predetermined depth, where the predetermined depth is related to the design process indicator, typically, the depth to which bored pile 11 is driven is greater than the depth of the work pit to ensure that bored pile 11 is supported in the work pit.
And S50, placing the reinforcing sliding plate 3 into the bottom of the working pit, and ensuring that the support changing surface 321 is in stop contact with the bored pile 11, so as to form support for the bored pile 11.
S60, pouring a part of structure of the jacking frame 6 on the plate body 31 until the part of structure reaches the bottom of the inner support frame 5, wherein the inner support frame 5 is required to be constructed and dismantled against the working condition because the inner support frame 5 interferes with the upper structure of the jacking frame 6;
and S70, removing the inner support frame 5, and in the removing process, preventing the bored pile 11 from inclining by contacting the support changing surface 321 with the bored pile 11, reducing the cantilever height of the bored pile 11 and ensuring that the reinforced slide plate 3 provides support for the bored pile 11.
S80, pouring the top of the jacking frame 6 to finish the construction of the jacking frame 6;
s90, erecting the jacking mechanism 7;
s100, removing the drilled pile wall 1 along the moving path of the jacking frame 6, and removing part of the blocking and protecting part 32 along the moving path of the jacking frame 6, wherein the removing can be manual removing or equipment removing; it will be appreciated that, whether the bored pile wall 1 or the shield 32 is removed, the gap formed by the removal should correspond to the movement direction of the jacking frame 6, that is, the gap is provided on the movement path of the jacking frame 6 to prevent the bored pile wall 1 and the shield 32 for timbering from interfering with the jacking frame 6.
S110, the jacking mechanism 7 drives the jacking frame 6 to move to the position below the operation railway, and the operation railway is penetrated downwards. Specifically, along the movement path of the jacking frame 6, the end of the jacking frame 6 is subjected to earth-excavating operation by manpower or equipment, the jacking mechanism 7 drives the jacking frame 6 to move along the excavated empty part while excavating, and finally the jacking frame moves to the lower part of the operation railway to complete underpass.
In a possible embodiment, as shown in fig. 1 to 4, before the step of S20, the construction method further includes: the cement mixing pile 21 is driven to form the cement mixing pile layer 2, so that the soil layer strength is improved, and the follow-up work is facilitated. It is to be understood that, after the cement mixing pile layer 2 is formed, the step S100 also includes crushing a portion of the cement mixing pile layer 2 along the movement path of the jacking frame 6.
In a possible embodiment, as shown in fig. 1 to 4, before the step of S20, the construction method further includes: a post pile 8 is driven to facilitate support of the subsequent inner support frame 5. Before the step of S60, the construction method further includes: and (4) removing the upright piles 8 to facilitate the construction of the jacking frame 6.
In a possible embodiment, as shown in fig. 6, before the step of S40, the construction method further includes: and verifying whether the connection strength of the crown beam 4 and the inner support frame 5 reaches the design value of 70%. If 70%, executing S40, otherwise returning to S30 to ensure the structure strength.
In a possible embodiment, as shown in fig. 6, before the step of S70, the construction method further includes: and verifying whether the connection strength of the support changing surface 321 and the bored pile 11 reaches the design value of 70%. If the supporting force reaches 70%, the step of S70 is executed, otherwise, the step of S50 is returned to, and the supporting face 321 of the reinforced sliding plate 3 is ensured to provide enough support.
The various embodiments/implementations provided herein may be combined with each other without contradiction.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (18)
1. The utility model provides a trade reinforcing slide of propping system for the construction of wearing existing railway under the road, its characterized in that: including the plate body that is used for supporting the jacking frame and protrusion in a plurality of fender of plate body top surface protect the piece, the plate body and a plurality of keep off and protect the piece formation and be used for holding the accommodation space of the at least partial structure of jacking frame, keep off and protect the piece and deviate from jacking frame one side have be used for with trade the face that props drilling pile wall backstop contact of system.
2. The enhanced skateboard of claim 1, wherein: the plurality of blocking and protecting pieces are arranged around the edge of the plate body.
3. The reinforced skateboard of claim 1, wherein: the fender is connected in the plate body is along the outside of horizontal direction, the basal surface of fender with the basal surface parallel and level of plate body, the top surface protrusion of fender in the top surface of plate body.
4. The reinforced skateboard of claim 1, wherein: the thickness of one side, close to the plate body, of the blocking and protecting piece is smaller than the thickness of one side, far away from the plate body, of the blocking and protecting piece.
5. The reinforced skateboard of claim 1, wherein: the blocking and protecting piece and the plate body are integrally formed.
6. The reinforced skateboard of any one of claims 1 to 4, wherein: the plate body is of a reinforced concrete structure; and/or the presence of a gas in the gas,
the blocking and protecting piece is of a reinforced concrete structure.
7. The reinforced skateboard of claim 6, wherein: the plate bodies and the reinforcing steel bars of the blocking and protecting pieces are transversely and longitudinally staggered.
8. A trade of operation railway props system which characterized in that: the device comprises a bored pile wall consisting of a plurality of bored piles fixed in the soil layer side by side, a jacking frame, a jacking mechanism and the reinforced slide plate of any one of claims 1 to 7;
it is a plurality of the carriage is enclosed into to the drilling pile wall, the carriage inner space is for working the hole, the reinforcing slide is located the bottom in work hole, the jacking frame support with sliding in the top surface of plate body, trade the holding surface with drilling pile wall backstop contact, the mechanism is used for the drive is advanced in the jacking frame motion.
9. The system of claim 8, wherein: the first end of the jacking mechanism is connected with the drilled pile wall, and the second end of the jacking mechanism is connected with the jacking frame.
10. A bracing change system according to claim 8 or 9, wherein: the jacking mechanism is an oil cylinder, an air cylinder or a motor.
11. A bracing change system according to claim 8 or 9, wherein: trade and prop the system and still include a plurality of cement mixing stake, cement mixing stake encloses and establishes the outside of carriage is in order to form cement mixing stake layer.
12. A bracing change system according to claim 8 or 9, wherein: the jacking frame comprises a body with a plurality of horizontal channels, and the end part of the body is connected with the second end of the jacking mechanism along the extension direction of the horizontal channels.
13. The system of claim 12, wherein: the jacking frame is a reinforced concrete frame.
14. A construction method of a underpass operation railway, which is applied to the support changing system of any one of claims 8 to 13, and comprises the following steps:
driving the drilling piles into the soil layer to form a plurality of drilling pile walls, wherein the plurality of drilling pile walls form a support frame;
preliminarily digging a working pit in the supporting frame until the top end of the drilled pile; constructing a crown beam and an inner support frame;
continuing to dig a work pit in the support frame to a predetermined depth;
placing the reinforced sliding plate into the bottom of a working pit, wherein the support changing surface is in backstop contact with the drilling pile;
pouring a partial structure of the jacking frame on the plate body until the bottom of the inner support frame is reached;
removing the inner supporting frame;
pouring the top of the jacking frame to finish the construction of the jacking frame;
erecting the jacking mechanism;
removing the drilled pile wall along the movement path of the jacking frame, and removing part of the blocking and protecting parts along the movement path of the jacking frame;
the jacking mechanism drives the jacking frame to move to the position below the operation railway so as to realize the downward passing of the operation railway.
15. The construction method according to claim 14, wherein: the construction method comprises the following steps of primarily digging a working pit in the supporting frame until the top end of the bored pile, and further comprising: and driving the cement mixing pile into the soil layer to form a cement mixing pile layer.
16. The construction method according to claim 14, wherein: the construction method comprises the following steps of primarily digging a working pit in the supporting frame until the top end of the bored pile, and further comprising: driving a vertical column pile into a soil layer to support the inner support frame; the construction method further comprises the following steps of pouring the top of the jacking frame, and before the construction of the jacking frame is completed: and removing the upright post pile.
17. The construction method according to claim 14, wherein the construction method further comprises, before continuing to excavate the work pit within the supporting frame up to a predetermined depth:
verifying whether the connection strength of the crown beam and the inner support frame reaches a design value of 70%;
and if the design value is 70%, the step of continuously digging the working pit in the support frame till the preset depth is carried out.
18. The method of claim 14, wherein prior to removing the inner support frame, the method further comprises:
verifying whether the connection strength of the support changing surface and the drilled pile reaches a design value of 70%;
and if 70 percent is reached, executing the step of dismantling the inner support frame.
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| CN201911000962.6A CN110777845A (en) | 2019-10-21 | 2019-10-21 | Reinforced sliding plate, support replacing system and construction method for underpass operation railway |
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| CN201911000962.6A CN110777845A (en) | 2019-10-21 | 2019-10-21 | Reinforced sliding plate, support replacing system and construction method for underpass operation railway |
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