CN117904911B - Construction method for underpass of existing line of newly-built line - Google Patents
Construction method for underpass of existing line of newly-built line Download PDFInfo
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- CN117904911B CN117904911B CN202410317208.XA CN202410317208A CN117904911B CN 117904911 B CN117904911 B CN 117904911B CN 202410317208 A CN202410317208 A CN 202410317208A CN 117904911 B CN117904911 B CN 117904911B
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- 238000010276 construction Methods 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 claims abstract description 28
- 238000007599 discharging Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 230000002787 reinforcement Effects 0.000 claims description 28
- 238000013461 design Methods 0.000 claims description 12
- 238000009412 basement excavation Methods 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 8
- 239000002689 soil Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000000149 penetrating effect Effects 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Abstract
The invention provides a construction method for underpass of an existing line of a newly-built line, belonging to the technical field of road construction; the method specifically comprises the following steps: s1, constructing an auxiliary road near a position where a newly-built line needs to intersect with an existing line, and guiding a half of vehicles passing on the existing line to the auxiliary road; s2, sealing the half-width existing line after drainage; s3, excavating downwards a set distance on the existing line at the closed position to form a construction platform, wherein in the excavating process, slope discharging and excavating are carried out on one side of the other half existing line which is close to normal operation, and pile foundations are constructed on the construction platform; s4, constructing a bent cap at the top of the pile foundation; s5, installing a precast beam piece on the bent cap to form a bridge; s6, recovering half existing lines communicated with the bridge to pass, and draining vehicles passing on the other half existing lines; s7, closing the other half-width existing lines; s8, constructing a bridge on the other half existing line; the method solves the technical problems of high manufacturing cost and poor safety of the cross line construction mode in the prior art.
Description
Technical Field
The invention belongs to the technical field of road construction, and particularly relates to a construction method for underpass of an existing line on a newly built line.
Background
Along with the rapid development of the economy in China, the construction of traffic infrastructures is continuously improved, and the highway network of the main road is gradually improved, but the highway network is inevitably crossed with the main road (i.e. the existing line) of the existing highway in the improvement process of the highway network, especially in the new reconstruction process of the high-grade highway. At present, the mode of constructing the newly-built high-grade highway (i.e. newly-built line) and the existing highway in a crossing way is that the highway is crossed upwards or downwards. The upper span is the construction of bridging above the existing line, and the lower pass is the construction of excavating a tunnel below the existing line. However, the mode of the upper span has the limitations of high cost, large occupied area, high space requirement and other factors, and the construction above the existing line is not easy to ensure the safety of vehicles and constructors passing through the existing line below; in order to ensure that the normal operation of the existing line is not influenced when the tunnel is excavated in a downward penetrating manner, a supporting structure with a higher protection level is required to be arranged in the tunnel, the construction cost is quite high, and the construction safety is not easy to guarantee.
The invention patent with the patent document number of CN103938512A discloses a reverse construction method for a newly built road to downwards penetrate an existing expressway, and specifically discloses a construction method for downwards penetrating a bridge by firstly sealing a half existing line, specifically taking a left side as an example, constructing a bridge pile foundation on a sealed left half road roadbed, installing a corresponding precast beam body after the construction is completed, thereby completing the communication of the half road, completing the construction of another half road by the same method, and downwards digging the bottom soil of the downwards penetrating bridge to the design elevation of a new line after the construction of the existing line bridge is completed.
In the technical scheme, although the technical problems of high construction cost and poor safety of the existing construction mode of the crossed line in the prior art are solved, in the process of excavating earthwork below the constructed bridge, the original roadbed earthwork of the expressway is hard and the earthwork quantity is large as the roadbed earthwork top surface is too close to the newly-built bridge bottom surface, is tens of centimeters away from the beam slab bottom surface, is even only 25mm away from the bent cap bottom surface, and needs to be constructed by adopting a large machine, the construction vibration of the construction machine is generated in the construction process, the bridge is inevitably knocked, the bridge which is already constructed is easily damaged, and the stability of the bridge is influenced. The construction efficiency is lower.
The invention patent with the patent document number of CN107012876A discloses a cooperative integral foundation and an enclosure structure and a construction method thereof, and particularly in the case, the method is used for excavating all the closed expressway with a half width in construction, and reinforcing the expressway subgrade with a half width in operation in the form of the enclosure structure such as steel sheet piles or anchor rods.
Accordingly, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a construction method for underpass of an existing line of a newly built line, so as to solve the technical problems of high construction cost and poor safety of the existing construction mode of a crossed line in the prior art.
In order to achieve the above purpose, the construction method for the existing line to be penetrated under the newly built line of the invention provides the following technical scheme:
a construction method for underpass of existing line of newly built line includes the following steps:
S1, constructing an auxiliary road near a position where a newly-built line needs to intersect with an existing line, and guiding a half of vehicles passing on the existing line to the auxiliary road;
s2, sealing the half-width existing line after drainage;
S3, excavating a preset distance downwards on the existing line at the closed position to form a construction platform, in the excavating process, carrying out slope discharging and excavating on one side of the other half existing line close to normal operation, forming a first supporting slope between the construction platform and the other half existing line of normal operation, and constructing pile foundations on the construction platform;
S4, constructing a bent cap at the top of the pile foundation;
s5, installing a precast beam piece on the bent cap to form a bridge;
s6, recovering half of the existing lines communicated with the bridge to pass through, and draining vehicles passing through the other half of the existing lines;
s7, closing the other half-width existing lines;
S8, constructing bridges on the other half existing lines.
As a further optimized technical solution, in S3, the construction pile foundation includes the following steps:
Respectively carrying out pile placement lofting on two ends of the construction platform along the length extension direction of the existing line;
drilling holes at the lofting position;
checking after pore forming, and lowering the reinforcement cage after the checking is qualified, and lowering the reinforcement cage to the designed elevation;
pouring concrete into the holes to form bridge end supporting piers for supporting two ends of a bridge;
Multiple rows of pile positions are lofted between two rows of bridge end supporting piers, and a straight line formed by each row of pile positions is perpendicular to the length extending direction of the existing line;
drilling holes on pile positions close to the normal traffic half lines;
Lowering the top end of the reinforcement cage to a position close to the designed elevation of the newly-built line, fixing the reinforcement cage, pouring concrete to the top end of the reinforcement cage, and forming a bridge body supporting pier after pouring is completed, wherein the bridge body supporting pier is used for supporting a bridge body between two ends of a bridge;
excavating construction platforms among bridge end support piers to the designed elevation of a newly built line after the construction of all bridge body support piers close to the normal passing half-width existing line is completed, and continuing to carry out slope-discharging type soil excavation on one side close to the normal running other half-width existing line in the excavating process to form a second supporting slope;
Constructing the rest bridge body supporting piers on the excavated working surface;
And pouring an upright post on the bridge body support pier, wherein the upright post and the bridge end support pier are used for supporting the precast beam piece together.
As a further optimized technical solution, in S8, constructing the bridge on the other half of the existing line includes the following steps:
the existing line at the construction position is directly excavated downwards to the design elevation of the new line;
and constructing the bridge end support pier and the bridge body support pier on the excavation working surface, and constructing the upright post on the bridge body support pier.
As a further optimized technical scheme, in the process of constructing the bridge body supporting pier, the method for fixing the reinforcement cage comprises the following procedures:
Four hanging bars are uniformly fixed on the reinforcement cage at intervals in the circumferential direction, and are arranged in parallel with the axis of the reinforcement cage;
four sleepers are erected at the hole openings after the reinforcement cage is placed into the hole, and the hanging bars are detachably fixed on the sleepers.
As a further optimized technical solution, in S4, the method for constructing the capping beam at the top of the pile foundation includes the following steps:
Digging a set depth downwards on a construction platform at the bridge end support pier position to form a groove with a shape similar to that of the capping beam;
chiseling the bridge end support pier to a designed elevation;
after a capping beam mold is arranged in the groove, pouring is carried out to form a capping beam at the top of the bridge end supporting pier;
And (3) installing a template of the capping beam on the top of the upright post, and pouring to form the capping beam on the top of the upright post.
As a further optimized technical scheme, the gradient of the first supporting slope is 1:1, and the second supporting slope and the gradient of the first supporting slope are integrally extended.
As a further optimized technical scheme, the gradient of the second supporting slope is 1:1.
As a further optimized technical scheme, in S3, the width is set from the edge of the other half existing line when the construction platform is excavated.
As a further optimized technical scheme, after the second supporting slope is formed, all bridge body supporting piers close to the normal traffic half-width existing line are arranged on the second supporting slope, and the method for constructing the upright post on the bridge body supporting piers close to the normal traffic half-width existing line comprises the following steps:
Excavating a construction groove on a second supporting slope at the top of the bridge body supporting pier, wherein the edge of the construction groove is spaced from the bridge body supporting pier by a set distance;
supporting piles are arranged around the construction groove;
And mounting a column mould at the top of the bridge body support pier to the designed elevation of the column, and then pouring concrete.
As a further optimized technical scheme, after the construction of the capping beam at the top of the bridge end supporting pier is completed, the construction platform at the position of the bridge end supporting pier is excavated to the design elevation of the newly-built line, and then the capping beam at the top of the upright post is constructed.
The beneficial effects are that: through establishing the auxiliary road earlier, the traffic vehicle on the existing line drains to the auxiliary road, guarantee construction safety, then need pass the position of existing line at newly-built circuit and construct the formation bridge, excavate existing line to newly-built line design elevation position when constructing the bridge, then directly construct newly-built circuit in bridge bottom, compare with prior art, effectively guaranteed construction safety, and need not to stride the construction bridge and build the higher tunnel support of protection level, reduce the construction degree of difficulty, can effectively accelerate the engineering progress, reduce construction cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. Wherein:
FIG. 1 is a schematic cross-sectional view of an existing wire in accordance with one embodiment of the present invention;
FIG. 2 is another schematic cross-sectional view of an existing wire in accordance with one embodiment of the invention;
FIG. 3 is a schematic illustration of an existing wire longitudinal section of one embodiment of the present invention;
fig. 4 is a schematic cross-sectional view of a half-width existing line of construction completion according to one embodiment of the present invention.
In the figure: 1. an existing wire; 101. a first support ramp; 102. a second support ramp; 2. a construction platform; 3. a capping beam; 4. prefabricating beam sheets; 5. bridge end supporting piers; 6. newly-built a circuit; 7. bridge body supporting piers; 8. a column; 9. a guardrail.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. refer to the orientation or positional relationship based on that shown in the drawings, merely for convenience of description of the present invention and do not require that the present invention must be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. The terms "coupled" and "connected" as used herein are to be construed broadly and may be, for example, fixedly coupled or detachably coupled; either directly or indirectly through intermediate components, the specific meaning of the terms being understood by those of ordinary skill in the art as the case may be.
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention provides a construction method for penetrating an existing line under a new line, which is characterized in that an auxiliary road is firstly established, a passing vehicle on the existing line is led to the auxiliary road, construction safety is guaranteed, then a bridge is formed by constructing the new line at a position where the new line needs to penetrate the existing line, and the new line is directly constructed at the bottom of the bridge after the bridge construction is completed.
Specifically, as shown in fig. 1 and 2, the construction method for underpass existing lines of a newly built line comprises the following steps:
S1, constructing an auxiliary road near the intersection position of the newly built line 6 and the existing line 1, and guiding a half of vehicles passing on the existing line 1 near one side of the auxiliary road to the auxiliary road by bypassing the intersection position of the newly built line and the existing line 1 as long as the traffic pressure of the existing line 1 can be shared;
S2, sealing the half-width existing line 1 after drainage by setting a guide sign, a roadblock and other common ways for sealing the highway;
S3, excavating the existing line 1 roadbed at the closed position downwards for 1.5-2 m to form a construction platform 2, and specifically removing the guard rail 9 to remove the original pavement structure and roadbed filler on the existing line 1. In the process of excavation, slope discharging and excavating are carried out on one side of the other half existing line 1 which is close to normal operation, a first supporting slope 101 is formed between the construction platform 2 and the other half existing line 1 which is in normal operation, the gradient of the first supporting slope 101 is 1:1, and therefore operation safety of the other half existing line 1 which is in normal operation is guaranteed, and pile foundations are constructed on the construction platform 2. The construction pile foundation comprises the following procedures:
Respectively carrying out pile placement lofting of a row at two ends of the construction platform 2 along the length extension direction of the existing line 1; then constructing by a conventional construction mode of the cast-in-place concrete pile foundation, wherein the construction method specifically comprises the steps of drilling holes at a lofting position by using a drilling machine; checking after pore forming, and lowering the reinforcement cage after the checking is qualified, and lowering the reinforcement cage to the designed elevation; pouring concrete into the holes through the guide pipes to form bridge end supporting piers 5, wherein the bridge end supporting piers 5 are used for supporting two ends of a bridge along the bridge direction; during pouring, the top surface of the concrete is required to be ensured to be 0.8-1 m higher than the designed elevation, a plurality of rows of pile positions are lofted between two rows of bridge end supporting piers 5, and the straight line formed by each row of pile positions is perpendicular to the length extending direction of the existing line 1, and the 'straight line formed by each row of pile positions' is a line formed by connecting the axes of each row of piles; firstly, constructing a pile foundation close to one side of a normal-traffic half-width existing line 1, specifically, drilling holes on a pile position close to the normal-traffic half-width existing line 1 by using a drilling machine, wherein the depth of the holes exceeds the design elevation of the existing line 1, namely, the holes need to be drilled below the existing line 1; and then lowering the reinforcement cage, wherein in the lowering process, the top end of the reinforcement cage is lowered to a position close to the designed elevation of the newly-built line 6 and the reinforcement cage is fixed, then concrete is poured to the top end of the reinforcement cage, and a bridge body supporting pier 7 is formed after the pouring is completed and used for supporting a beam body between two ends of a bridge. As particularly shown in fig. 3. After the construction of all bridge body support piers 7 close to the normal passing half-width existing line 1 is completed, constructing pile foundations on the side far from the normal passing half-width existing line 1, specifically, firstly excavating a construction platform 2 between bridge end support piers 5 to the design elevation of a new line 6, and continuously carrying out slope-releasing soil excavation on the side close to the normal running other half-width existing line 1 in the excavating process to form a second supporting slope 102; the second supporting slope 102 extends integrally with the slope of the first supporting slope 101, and the slope of the second supporting slope 102 is 1:1. Constructing a rest bridge body supporting pier 7 on the excavated working surface; the construction mode adopts the conventional cast-in-situ concrete pile mode to construct, after the construction of all bridge body support piers 7 is completed, upright posts 8 are poured on the bridge body support piers 7, and the heights of the upright posts 8 are consistent with those of the bridge end support piers 5 and are used for supporting the precast beam slices 4 together with the bridge end support piers 5.
S4, constructing a bent cap 3 at the top of the pile foundation; the construction bridge comprises a capping beam 3 at the top of a construction bridge end supporting pier 5 and a capping beam 3 at the top of a construction upright post 8.
The capping beam 3 on top of the bridge end support pier 5 comprises the following steps:
A set depth is excavated downwards on a construction platform 2 at the position of a bridge end supporting pier 5 so as to form a groove with a shape similar to that of a capping beam 3; chiseling off the top ends of the multi-pouring bridge end support piers 5 to the designed elevation of the bridge end support piers 5; after installing a capping beam 3 die in the groove, pouring to form a capping beam 3 at the top of the bridge end supporting pier 5; at this time, the construction platform 2 at the position of the supporting pier 5 at the excavation bridge end can be further moved to the design elevation of the newly-built line 6, and then the capping beam 3 at the top of the upright post 8 is constructed.
The capping beam 3 on top of the upright post 8 comprises the following steps:
And (3) performing a template for installing the capping beam 3 on the top of the upright post 8, and then pouring to form the capping beam 3 on the top of the upright post 8.
S5, installing a precast beam piece 4 on the bent cap 3 to form a bridge; after the bridge is formed, the bridge end supporting piers 5 support the two ends of the bridge, and the bridge body supporting piers 7 and the upright posts 8 support the bridge body of the bridge together. The diameter of the upright post 8 is smaller than the cross-sectional dimension of the bridge support pier 7, and the diameter of the bridge end support pier 5 is the same as the cross-sectional dimension of the bridge support pier 7. As shown in fig. 4, after the bridge is formed, the space below the bridge is excavated to the design elevation of the new line 6 except the first supporting slope 101 and the second supporting slope 102, and the space occupied by the first supporting slope 101 and the second supporting slope 102 is smaller, so that large-scale excavation construction is not required, when the other half existing line 1 is built, the first supporting slope 101 and the second supporting slope 102 can be excavated along with the other half existing line 1, thereby being convenient for the construction of the new line 6 to be directly carried out in the later period, and further ensuring the stability of the built bridge.
S6, restoring the half existing line 1 communicated with the bridge to pass, guiding vehicles passing through the intersection position of the other half existing line 1 and the newly-built line 6, and guiding the vehicles to the newly-built opened half line; the construction of the half-width existing line 1 is then started.
S7, closing the other half-width existing line 1;
s8, constructing a bridge on the other half existing line 1. The bridge construction on the other half existing line 1 comprises the following steps:
The existing line 1 at the position to be constructed is directly excavated downwards to the design elevation of the newly built line 6; then constructing the bridge end support pier 5 and the bridge body support pier 7 on the excavation working face, and constructing the upright posts 8 on the bridge body support pier 7. After the construction is finished, the capping beam 3 is poured after the top of the bridge end supporting pier 5 and the top of the bridge body supporting pier 7 are respectively provided with a die, and then the capping beam 3 is provided with the precast beam piece 4 to form a bridge. So far, the construction of the existing line 1 is completed, a bridge is formed at the intersection position of the existing line 1 and the newly-built line 6, then the normal passage of the existing line 1 is restored, and the auxiliary road is removed. And constructing a new line 6 directly below the bridge.
Further, in S2, in the process of constructing the bridge body supporting pier 7, the manner of fixing the reinforcement cage includes the following steps:
Four bars 20 are uniformly fixed on the reinforcement cage at intervals in the circumferential direction and serve as hanging bars, and the hanging bars are arranged in parallel with the axis of the reinforcement cage; four sleepers are erected in a well shape at the hole after the reinforcement cage is placed into the hole, and the hanging bars are detachably fixed on the sleepers, wherein the concrete fixing mode can be to bend hooks at the tail ends of the hanging bars, and then hang the hanging bars on the sleepers.
Further, in S3, in order to further ensure the running stability of the existing line 1 when the construction platform 2 is excavated, the width needs to be set from the edge of the other half existing line 1 when the construction platform 2 is excavated, and in this embodiment, the set width is 750mm.
Further, after the second supporting slope 102 is formed, all the bridge body supporting piers 7 close to the normal passing half-width existing line 1 are arranged on the second supporting slope 102, and the method for constructing the upright posts 8 on the bridge body supporting piers 7 close to the normal passing half-width existing line 1 comprises the following procedures:
excavating a construction groove on a second supporting slope 102 at the top of the bridge body supporting pier 7, wherein the distance between the edge of the construction groove and the bridge body supporting pier 7 is set to be 1m in the embodiment;
supporting piles are arranged around the construction groove;
and installing a column 8 mould at the top of the bridge body supporting pier 7 until the column 8 reaches the designed elevation, and then pouring concrete.
In summary, through establishing the auxiliary road earlier, the traffic vehicle on the existing line drains to the auxiliary road, guarantee construction safety, then need pass the position of existing line at newly-built circuit and construct and form the bridge, the design elevation of newly-built circuit has been excavated to the bridge below when the bridge construction is accomplished, then can directly construct newly-built circuit below the bridge, can guarantee the safe passing of existing line, also need not set up the tunnel support of too high level, the overall construction degree of difficulty that has reduced, effectively accelerate the engineering progress, reduce construction cost.
It is to be understood that the above description is intended to be illustrative, and that the embodiments of the present application are not limited thereto.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The construction method for underpass of existing line of newly built line is characterized by comprising the following steps:
S1, constructing a secondary road near the position where a newly-built line (6) needs to be crossed with an existing line (1), and guiding vehicles passing on a half existing line (1) to the secondary road;
S2, sealing the half-width existing line (1) after drainage;
s3, excavating a preset distance downwards on the existing line (1) at a closed position to form a construction platform (2), in the excavating process, carrying out slope discharging and earth excavation on one side of the other half existing line (1) close to normal operation, forming a first supporting slope (101) between the construction platform (2) and the other half existing line (1) of normal operation, and constructing pile foundations on the construction platform (2);
S4, constructing a bent cap (3) at the top of the pile foundation;
s5, installing prefabricated beam sheets (4) on the bent cap (3) to form a bridge;
s6, recovering a half of the existing lines (1) communicated with the bridge to pass through, and draining vehicles passing through the other half of the existing lines (1);
s7, closing the other half-width existing line (1);
s8, constructing a bridge on the other half existing line (1);
in S3, the construction pile foundation includes the steps of:
Respectively carrying out pile placement lofting on two ends of the construction platform (2) along the length extension direction of the existing line (1);
drilling holes at the lofting position;
checking after pore forming, and lowering the reinforcement cage after the checking is qualified, and lowering the reinforcement cage to the designed elevation;
pouring concrete into the holes to form bridge end support piers (5) for supporting two ends of a bridge;
multiple rows of pile positions are lofted between two rows of bridge end supporting piers (5), and a straight line formed by each row of pile positions is perpendicular to the length extending direction of the existing line (1);
drilling holes on pile positions close to the normal traffic half-width existing line (1);
Lowering the top end of the reinforcement cage to a position close to the designed elevation of the newly-built line (6) and fixing the reinforcement cage, pouring concrete to the top end of the reinforcement cage, and forming a bridge body supporting pier (7) for supporting a bridge body between two ends of a bridge after pouring is completed;
Excavating a construction platform (2) between bridge body supporting piers (5) to a designed elevation of a new line (6) after the construction of all bridge body supporting piers (7) close to the existing line (1) in a normal passing half-width mode is completed, and continuously carrying out slope-discharging type soil excavation on one side close to the existing line (1) in the other half-width mode in the normal operation process to form a second supporting slope (102);
Constructing a rest bridge body supporting pier (7) on the excavated working surface;
Pouring an upright post (8) on the bridge body supporting pier (7), wherein the upright post (8) and the bridge end supporting pier (5) are used for supporting the precast beam piece (4) together;
In S8, the construction of the bridge on the other half of the existing line (1) includes the following steps:
The existing line (1) at the construction position is directly excavated downwards to the design elevation of the newly built line (6);
And constructing the bridge end support pier (5) and the bridge body support pier (7) on an excavation working surface, and constructing the upright post (8) on the bridge body support pier (7).
2. The construction method for underpass existing lines of newly built line according to claim 1, characterized in that the way of fixing the reinforcement cage during the construction of the bridge body support pier (7) comprises the following steps:
Four hanging bars are uniformly fixed on the reinforcement cage at intervals in the circumferential direction, and are arranged in parallel with the axis of the reinforcement cage;
four sleepers are erected at the hole openings after the reinforcement cage is placed into the hole, and the hanging bars are detachably fixed on the sleepers.
3. The construction method for underpass existing lines on newly built line according to claim 1, wherein in S4, the method for constructing the capping beam (3) on top of pile foundation comprises the steps of:
a set depth is excavated downwards on a construction platform (2) at the position of the bridge end supporting pier (5) so as to form a groove with a shape similar to that of the capping beam (3);
chiseling the bridge end support pier (5) to a designed elevation;
After installing a capping beam (3) die in the groove, pouring to form a capping beam (3) at the top of the bridge end supporting pier (5);
and (3) installing a template of the capping beam (3) on the top of the upright post (8), and then pouring to form the capping beam (3) on the top of the upright post (8).
4. The construction method for underpass existing lines of claim 1, wherein the gradient of the first supporting slope (101) is 1:1, and the second supporting slope (102) extends integrally with the gradient of the first supporting slope (101).
5. The method of constructing a new line under-passing existing line according to claim 4, wherein the slope of the second supporting slope (102) is 1:1.
6. The construction method for underpass existing lines on newly built lines according to claim 1, wherein in S3, the width is set from the edge of the other half existing line (1) when the construction platform (2) is excavated.
7. The construction method for underpass existing lines on newly built line according to claim 1, wherein after the second supporting slope (102) is formed, all bridge body supporting piers (7) close to the normal passing half-width existing line (1) are disposed on the second supporting slope (102), and the method for constructing the upright post (8) on the bridge body supporting piers (7) close to the normal passing half-width existing line (1) comprises the following steps:
digging a construction groove on a second supporting slope (102) at the top of the bridge body supporting pier (7), wherein the edge of the construction groove is set at a distance from the bridge body supporting pier (7);
supporting piles are arranged around the construction groove;
and installing a stand column (8) die at the top of the bridge body supporting pier (7) until the stand column (8) is at a designed elevation, and then pouring concrete.
8. The construction method for underpass existing line of claim 2, wherein,
And excavating a construction platform (2) at the position of the bridge end support pier (5) to the design elevation of the newly-built line (6) after the construction of the capping beam (3) at the top of the bridge end support pier (5) is completed, and then constructing the capping beam (3) at the top of the upright post (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410317208.XA CN117904911B (en) | 2024-03-20 | Construction method for underpass of existing line of newly-built line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410317208.XA CN117904911B (en) | 2024-03-20 | Construction method for underpass of existing line of newly-built line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117904911A CN117904911A (en) | 2024-04-19 |
| CN117904911B true CN117904911B (en) | 2024-07-16 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103938512A (en) * | 2014-04-30 | 2014-07-23 | 陕西运通公路设计咨询有限公司 | Reverse construction method of newly built road with existing expressway in underneath penetrating manner |
| CN107012876A (en) * | 2017-06-09 | 2017-08-04 | 江西建工第二建筑有限责任公司 | One kind collaboration monoblock type foundation and building enclosure and its construction method |
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