CN108506032B - Construction method of large-volume top longitudinal beam in pilot tunnel - Google Patents
Construction method of large-volume top longitudinal beam in pilot tunnel Download PDFInfo
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- CN108506032B CN108506032B CN201810207640.8A CN201810207640A CN108506032B CN 108506032 B CN108506032 B CN 108506032B CN 201810207640 A CN201810207640 A CN 201810207640A CN 108506032 B CN108506032 B CN 108506032B
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- 238000010276 construction Methods 0.000 title claims abstract description 54
- 238000009434 installation Methods 0.000 claims abstract description 9
- 230000010412 perfusion Effects 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 87
- 239000010959 steel Substances 0.000 claims description 87
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 239000002699 waste material Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 6
- 238000003466 welding Methods 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D17/00—Caps for supporting mine roofs
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Abstract
The invention relates to the field of tunnel construction, in particular to a construction method of a large-volume top longitudinal beam in a pilot tunnel, which adopts a supporting device, wherein the supporting device comprises: the supporting piece is used for supporting the top longitudinal beam mould; one end of the adjusting piece is connected with the supporting piece, and the adjusting piece is used for adjusting the position of the supporting piece; the construction method comprises the following steps: the installation step: the supporting device is used for installing the supporting device in the guide hole, and the top longitudinal beam die is installed on the supporting piece; and (3) perfusion: the top longitudinal beam mould is used for pouring top longitudinal beam concrete into the top longitudinal beam mould; a step of removing the mold: the top longitudinal beam mould and the supporting device are dismantled. Through the supporting device structure and the construction method, the top longitudinal beam mold and the supporting device can be installed and removed by adjusting the position of the supporting piece before and after pouring, so that the supporting device can be repeatedly used, waste is avoided, and construction cost is reduced.
Description
Technical Field
The invention relates to the field of tunnel construction, in particular to a construction method of a large-volume top longitudinal beam in a pilot tunnel.
Background
Along with the rapid development of urban subway construction, large underground excavated subway stations increasingly penetrate through bridge piles, stations and structures, the PBA method has the advantages of the underground excavation construction method in underground excavated subway station construction, has obvious advantages in the aspect of settlement control, and is increasingly applied to underground excavated subway station construction. However, the PBA method has narrow pilot hole space, large-volume top longitudinal beam operation space is limited, and more restrictions are formed on the installation and the removal of a bottom die of the top longitudinal beam; the common method is that a bracket which cannot be removed is installed at the bottom of the top longitudinal beam in the pilot tunnel, and after the structure is buckled, the middle earthwork is dug downwards and then removed, so that the support cannot be used repeatedly, and is not economical.
Disclosure of Invention
The invention aims to: aiming at the problems in the prior art, a construction method of a large-volume top longitudinal beam in a pilot tunnel is provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
a construction method of a large-volume top longitudinal beam in a pilot tunnel adopts a supporting device, and the supporting device comprises:
the supporting piece is used for supporting the top longitudinal beam mould;
one end of the adjusting piece is connected with the supporting piece, and the adjusting piece is used for adjusting the position of the supporting piece;
the construction method comprises the following steps:
the installation step: the supporting device is used for installing the supporting device in the guide hole, and the top longitudinal beam die is installed on the supporting piece;
and (3) perfusion: the top longitudinal beam mould is used for pouring top longitudinal beam concrete into the top longitudinal beam mould;
a step of removing the mold: the top longitudinal beam mould and the supporting device are dismantled.
Through the supporting device structure and the construction method, the top longitudinal beam mold and the supporting device can be installed and removed by adjusting the position of the supporting piece before and after pouring, so that the supporting device can be repeatedly used, waste is avoided, and construction cost is reduced.
As a preferable aspect of the present invention, before the mounting step, the method further comprises the steps of:
a calculation step: the size of the supporting device is used for meeting construction requirements.
Before the supporting device is machined, the size of the supporting device is calculated according to the stress condition of the supporting device, the stability of the supporting device is guaranteed, and the construction safety is guaranteed. Specifically, the method comprises the following steps:
as a preferable aspect of the present invention, the calculating step includes:
calculating the distance between the bottom of the top longitudinal beam and the bottom of the pilot tunnel;
determining the size of the supporting device;
and (5) checking the strength, rigidity and stability of the supporting device.
As a preferred scheme of the invention, the top longitudinal beam die comprises a top longitudinal beam bottom die and a top longitudinal beam side die, and the mounting step comprises the following steps:
a processing support device;
installing a supporting device in the pilot tunnel;
and (4) mounting the bottom die of the top longitudinal beam on the supporting device, binding steel bars and mounting the side die of the top longitudinal beam.
In the scheme, the supporting device can be processed on site, so that the supporting device can better adapt to the requirements in specific construction.
As a preferable aspect of the present invention, the processing support device includes:
welding two I-shaped steels together, and reserving a hole between the two I-shaped steels to form a supporting piece;
the screw rod is sleeved with the nut, so that the screw rod and the nut jointly form an adjusting piece, and one end of the screw rod extends into a hole between the two I-shaped steels.
The I-steel is a common material in a construction site, and the I-steel is adopted to manufacture the supporting piece, so that the cost is reduced. In addition, the I-shaped steel is adopted, and the following advantages are achieved: the width of the middle part of the I-steel is smaller than the width of the top end and the width of the bottom end, so that when the two I-steels are connected together to form the support piece, a space for accommodating the screw rod can be naturally formed in the support piece, and therefore the support piece can be prevented from generating large lateral extrusion force on the screw rod, and the support piece can smoothly move along the screw rod.
After the nut is sleeved on the screw rod, the nut is matched with the screw rod, the supporting piece is abutted against the nut, and the position of the supporting piece is determined by the position of the nut, so that the supporting piece can move up and down along the screw rod by rotating the nut, and a space required by the supporting device is reserved for installation and removal. Specifically, the method comprises the following steps:
as a preferred scheme of the invention, the mould removing step comprises the following steps:
and after the top longitudinal beam concrete reaches the stripping condition, loosening a screw rod on the supporting device, reserving a space for stripping the top longitudinal beam mold, and stripping the top longitudinal beam mold and the supporting device.
As a preferable scheme of the invention, when two I-shaped steels are welded together, a plurality of holes are reserved in the length direction of the I-shaped steels.
After a plurality of holes are reserved in the length direction of the I-shaped steel, a plurality of lead screws and nuts are connected to one supporting piece, and therefore supporting capacity is improved.
As a preferable aspect of the present invention, the processing support device further includes:
and one end of the screw rod, which is far away from the I-shaped steel, is connected with the channel steel.
The setting of channel-section steel for the lead screw can stably support between backup pad and pilot hole bottom. Meanwhile, the channel steel is also a common material in a construction site, and the processing difficulty and cost of the supporting device can be favorably reduced by using the channel steel.
As a preferable aspect of the present invention, the installing of the supporting device in the pilot tunnel includes:
paving square timbers in the guide holes along the length direction of the top longitudinal beam;
the channel steel is matched with the square timber.
As a preferable aspect of the present invention, a plurality of adjusting members and a plurality of supporting members are provided in the longitudinal direction of the roof side rail.
According to the mode, the channel steel is matched with the square timber, so that the stability of a single adjusting piece is improved. In addition, on the length direction of top longeron, set up a plurality of regulating parts and support piece, a plurality of regulating parts are connected on same root square timber, are favorable to improving the holistic stability of strutting arrangement.
As a preferable scheme of the invention, the distance between two adjacent adjusting pieces in the length direction of the top longitudinal beam is 100 mm-600 mm.
In the length direction of the top longitudinal beam, the distance between two adjacent adjusting pieces is arranged according to the distance, so that the supporting device can be ensured to have higher stability and enough bearing capacity, and the inconvenience in disassembly and assembly caused by too dense arrangement of the supporting device can be avoided.
As the preferred scheme of the invention, the side beam side mould is provided with a side pouring hole;
the perfusion step comprises:
pouring back-dragging steel pipes into the concrete at the top of the pre-embedded top longitudinal beam, wherein the back-dragging steel pipes are arranged along the length direction of the top longitudinal beam;
pouring concrete at the middle part and the lower part of the top longitudinal beam from the side pouring holes;
and pouring concrete at the top of the top longitudinal beam in the pre-buried back-dragging steel pipe, and dragging the back-dragging steel pipe at the same time.
The existing pouring method is to pour the whole top longitudinal beam through a side pouring hole, and when the pouring method is adopted for construction, cavities are easy to appear at the top of the top longitudinal beam due to insufficient pouring compactness. By adopting the pouring step provided by the invention, the pouring of the top longitudinal beam and the middle-lower part of the top longitudinal beam are separated, so that the pouring compactness of the top longitudinal beam can be improved, and the top of the top longitudinal beam is prevented from generating a cavity.
As a preferred aspect of the present invention, the perfusion step further comprises:
embedding a backfill grouting steel pipe, wherein the backfill grouting steel pipe is distributed along the height direction of the top longitudinal beam, and one end of the backfill grouting steel pipe is positioned at the top of the top longitudinal beam;
and after the back-dragging steel pipe finishes the concrete pouring of the top longitudinal beam, carrying out the top backfill grouting of the top longitudinal beam through the backfill grouting steel pipe.
And backfilling and grouting through the embedded grouting pipe, and filling a concrete shrinkage gap to ensure that the top of the top longitudinal beam is closely attached to the primary support waterproof layer.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
the supporting device is convenient to install and remove, so that the supporting device can be used for multiple times, the utilization rate is improved, and the waste is reduced;
drawings
Fig. 1 is a schematic cross-sectional structure of the supporting device provided by the invention in the using process.
Fig. 2 is a schematic longitudinal structure of the supporting device provided by the invention.
FIG. 3 is a flow chart of the construction method provided by the present invention.
Icon: 1-a first mating portion; 2-a screw rod; 3-a nut; 4-square timber; 5-a support member; 51-a first i-beam; 52-second i-beam; 6-top longitudinal beam bottom die; 7-top stringer; 8-top longitudinal beam side die; 10-guiding a hole; 11-back dragging the steel pipe; 12-backfilling a grouting steel pipe; 22-side pouring hole.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
Please refer to fig. 1-3. The invention provides a supporting device for a large-volume top longitudinal beam 7 in a pilot hole 10. The supporting device can play a role in supporting the top longitudinal beam 7 mould in the pilot tunnel 10 of the PBA construction method, is convenient to install and remove, and can be used for multiple times.
The supporting device comprises a support 5, wherein the support 5 is used for supporting a top longitudinal beam bottom die 6; and one end of the adjusting piece is connected with the supporting piece 5, and the adjusting piece is used for adjusting the distance between the supporting piece 5 and the bottom of the guide hole 10.
When the supporting device is used, the supporting device is placed in the guide hole 10, the top longitudinal beam bottom die 6 is laid above the supporting device, reinforcing steel bars are bound, the side die is closed, concrete pouring of the top longitudinal beam 7 is carried out, and after the pouring is completed, the distance between the supporting piece 5 and the bottom of the guide hole 10 is adjusted, so that the supporting piece 5 can be far away from the top longitudinal beam 7, and a space for dismantling the supporting device is reserved. Meanwhile, the supporting device can be used for multiple times, the utilization rate is improved, and the cost is reduced.
On the basis of the structure, the adjusting piece comprises a screw rod 2 and a nut 3, and the screw rod 2 is sleeved with the nut 3.
In use, the nut 3 is used to abut the top stringer base mould 6 so that by virtue of the position of the nut 3 on the lead screw 2, the height of the support 5 can be adjusted, thereby leaving room for the support means to be removed.
On the basis of the structure, the supporting member 5 comprises a first i-beam 51 and a second i-beam 52, the first i-beam 51 is connected with the second i-beam 52, and a matching hole for the screw rod 2 to pass through is formed between the first i-beam 51 and the second i-beam 52.
The first i-beam 51 and the second i-beam 52 can be connected by welding, so that the assembly of the support 5 at a production site is facilitated. When the first i-beam 51 and the second i-beam 52 are connected, a hole for the screw rod 2 to pass through is reserved.
The I-shaped steel is common material in construction site, and the first I-shaped steel 51 and the second I-shaped steel 52 are formed by connecting I-shaped steel, which is beneficial to reducing cost. In addition, the I-shaped steel is selected for welding to form the supporting piece 5, and the supporting piece has the following advantages: the width of the middle part of the I-beam is smaller than the width of the top end and the bottom end, so that when the first I-beam 51 and the second I-beam 52 are connected together, a space for accommodating the screw rod 2 can be naturally formed in the support member 5 due to the structural characteristics of the I-beams, so that the first I-beam 51 and the second I-beam 52 can be prevented from generating large lateral extrusion force on the screw rod 2, and the support member 5 can be smoothly moved along the screw rod 2.
On the basis of the structure, the wood frame comprises at least two supporting pieces 5, at least two adjusting pieces and square wood 4, wherein the other end, far away from the supporting pieces 5, of each adjusting piece is connected with the square wood 4.
Because the length of the top longitudinal beam 7 is long, when the top longitudinal beam support device is used, a plurality of supporting pieces 5 and adjusting pieces are arranged according to the length of the top longitudinal beam 7, and therefore stable support of the top longitudinal beam bottom die 6 is achieved. During the mounting and dismounting of the support device, the respective support 5 and the adjusting member are dismounted separately. Each regulating part all links to each other with square timber 4 for the holistic stability of strutting arrangement can obtain very big promotion.
Further, the length direction of the support 5 is arranged in the width direction of the roof side rail 7. In the width direction of the top longitudinal beam 7, several adjusting elements can be arranged in connection with one and the same support element 5 in order to increase the load-bearing capacity of the support device.
On the basis of the structure, the square timber 4 is provided with a second matching part, the adjusting piece is provided with a first matching part 1, and the first matching part 1 is matched with the second matching part.
Through first cooperation portion 1 and second cooperation portion adaptation, realize the stable connection of square timber 4 and regulating part, further promote to make the holistic stability of device.
On the basis of the structure, the second matching part is of a rectangular structure, and the first matching part 1 is a channel steel matched with the second matching part.
Specifically, first cooperation portion 1 is the channel-section steel, and the channel-section steel adopts the channel-section steel for the common material in job site, is favorable to reducing strutting arrangement's cost. The second fitting portion has a rectangular structure, and specifically, the function of the second fitting portion can be realized by the structural characteristics of the square lumber 4 itself.
Based on the supporting device, the invention also provides a construction method of the large-volume top longitudinal beam 7 in the pilot tunnel 10. The construction method comprises the following steps:
the installation step: for mounting the support device in the pilot hole 10 and the top longitudinal beam 7 on the support 5;
and (3) perfusion: for pouring the top stringer 7 concrete in the top stringer 7 mould;
a step of removing the mold: for removing the top stringer 7 mould and support means.
Through the supporting device structure and the construction method, the installation and the removal of the top longitudinal beam 7 mould and the supporting device can be realized by adjusting the position of the supporting piece 5 before and after the pouring, so that the supporting device can be repeatedly used, the waste is avoided, and the construction cost is favorably reduced.
As a preferable aspect of the present invention, before the mounting step, the method further comprises the steps of:
a calculation step: the size of the supporting device is used for meeting construction requirements.
Before the supporting device is machined, the size of the supporting device is calculated according to the stress condition of the supporting device, the stability of the supporting device is guaranteed, and the construction safety is guaranteed. Specifically, the method comprises the following steps:
as a preferable aspect of the present invention, the calculating step includes:
calculating the distance between the bottom of the top longitudinal beam 7 and the bottom of the pilot tunnel 10;
determining the size of the supporting device;
and (5) checking the strength, rigidity and stability of the supporting device.
As a preferred scheme of the invention, the top longitudinal beam 7 mould comprises a top longitudinal beam bottom mould 6 and a top longitudinal beam side mould 8, and the mounting step comprises the following steps:
a processing support device;
installing a supporting device in the pilot tunnel 10;
and (3) mounting the top longitudinal beam bottom die 6 on the supporting device, binding reinforcing steel bars, and mounting the top longitudinal beam side die 8.
In the scheme, the supporting device can be processed on site, so that the supporting device can better adapt to the requirements in specific construction.
As a preferable aspect of the present invention, the processing support device includes:
welding two I-beams together, and reserving a hole between the two I-beams to form a support piece 5;
the screw rod 2 is sleeved with the nut 3, so that the screw rod 2 and the nut 3 jointly form an adjusting piece, and one end of the screw rod 2 extends into a hole between two I-shaped steels.
The I-steel is a common material in a construction site, and the I-steel is adopted to manufacture the supporting piece 5, so that the cost is reduced. In addition, the I-shaped steel is adopted, and the following advantages are achieved: the width of the middle part of the I-steel is smaller than the width of the top end and the bottom end, so that when the two I-steels are connected together to form the support piece 5, a space for accommodating the screw rod 2 can be naturally formed in the support piece 5, and therefore the support piece 5 can be prevented from generating large lateral extrusion force on the screw rod 2, and the support piece 5 can smoothly move along the screw rod 2.
After the nut 3 is sleeved on the screw rod 2, the nut 3 is matched with the screw rod 2, the support piece 5 is abutted to the nut 3, and the position of the support piece 5 is determined by the position of the nut 3, so that the nut 3 is rotated to enable the support piece 5 to move up and down along the screw rod 2, and a space required by the installation and the removal of the support device is reserved. Specifically, the method comprises the following steps:
as a preferred scheme of the invention, the mould removing step comprises the following steps:
and after the top longitudinal beam 7 concrete reaches the stripping condition, loosening the screw rod 2 on the supporting device, reserving a space for stripping the top longitudinal beam 7 mould, and stripping the top longitudinal beam 7 mould and the supporting device.
As a preferable scheme of the invention, when two I-shaped steels are welded together, a plurality of holes are reserved in the length direction of the I-shaped steels.
After a plurality of holes are reserved in the length direction of the I-shaped steel, a plurality of screw rods 2 and nuts 3 are connected to one supporting piece 5, and therefore supporting capacity is improved.
As a preferable aspect of the present invention, the processing support device further includes:
and one end of the screw rod 2, which is far away from the I-shaped steel, is connected with a channel steel.
Due to the arrangement of channel steel, the screw rod 2 can be stably supported between the supporting plate and the bottom of the pilot hole 10. Meanwhile, the channel steel is also a common material in a construction site, and the processing difficulty and cost of the supporting device can be favorably reduced by using the channel steel.
As a preferred aspect of the present invention, the installation of the supporting means in the pilot tunnel 10 comprises:
paving square timbers 4 in the pilot tunnel 10 along the length direction of the top longitudinal beam 7;
the channel steel is matched with the square timber 4.
As a preferable aspect of the present invention, a plurality of adjusting members and a plurality of supporting members 5 are provided in the longitudinal direction of the roof side rail 7.
According to the mode, the channel steel is matched with the square timber 4, so that the stability of a single adjusting piece is improved. In addition, on the length direction of roof longeron 7, set up a plurality of regulating parts and support piece 5, a plurality of regulating parts are connected on same root square timber 4, are favorable to improving the holistic stability of strutting arrangement.
In a preferred embodiment of the present invention, the distance between two adjacent adjusting members in the length direction of the top longitudinal beam 7 is 100mm to 600 mm.
In the length direction of the top longitudinal beam 7, the distance between two adjacent adjusting pieces is set according to the distance, so that the supporting device can be ensured to have higher stability and enough bearing capacity, and the inconvenience in disassembly and assembly caused by too dense arrangement of the supporting device can be avoided.
As the preferred scheme of the invention, the side beam side mold 8 is provided with a side pouring hole 22;
the perfusion step comprises:
pouring concrete at the top of the pre-buried top longitudinal beam 7 into a back-dragging steel pipe 11, and arranging the back-dragging steel pipe 11 along the length direction of the top longitudinal beam 7;
pouring concrete in the middle and lower parts of the top longitudinal beam 7 from the side pouring holes 22;
and pouring concrete on the top of the top longitudinal beam 7 into the pre-buried back-dragging steel pipe 11, and dragging the back-dragging steel pipe 11 at the same time.
In the existing pouring method, the whole top longitudinal beam 7 is poured through the side pouring hole 22, and when the pouring method is adopted for construction, the top of the top longitudinal beam 7 is easy to generate a cavity due to insufficient pouring compactness. By adopting the pouring step provided by the invention, the top of the top longitudinal beam 7 is separated from the pouring of the middle lower part of the top longitudinal beam 7, so that the pouring compactness of the top longitudinal beam 7 can be improved, and the top of the top longitudinal beam 7 is prevented from generating a cavity.
As a preferred aspect of the present invention, the perfusion step further comprises:
pre-burying a backfill grouting steel pipe 12, wherein the backfill grouting steel pipe 12 is distributed along the height direction of the top longitudinal beam 7, and one end of the backfill grouting steel pipe 12 is positioned at the top of the top longitudinal beam 7;
after the top back-dragging grouting is completed, top back-filling grouting is performed through the back-filling grouting steel pipe 12.
And backfilling and grouting are carried out through the embedded backfilling and grouting pipe, and a concrete shrinkage gap is filled, so that the top of the top longitudinal beam 7 is ensured to be closely attached to the primary support waterproof layer.
Further, grouting is performed from the bottom of the backfill grouting steel pipe 12 to the top of the backfill grouting steel pipe 12. The grout enters the top longitudinal beam 7 from the top of the backfill grouting steel pipe 12.
Furthermore, backfill grouting steel pipes 12 are arranged on two sides of the cross section of the top longitudinal beam 7.
Further, a plurality of backfill grouting steel pipes 12 are arranged in the longitudinal direction of the top longitudinal beam 7.
The construction method provided by the embodiment of the invention has the beneficial effects that:
1. the supporting device is convenient to install and remove, so that the supporting device can be used for multiple times, the utilization rate is improved, and the waste is reduced;
2. i-shaped steel is selected for welding to form the supporting piece 5, so that the first I-shaped steel 51 and the second I-shaped steel 52 can be prevented from generating larger lateral extrusion force on the screw rod 2, and the supporting piece 5 can smoothly move along the screw rod 2;
3. the number of the supporting pieces 5 and the number of the adjusting pieces are determined according to the actual situation of the top longitudinal beam 7, so that the stability and the strength of the supporting device are ensured;
4. by adopting the pouring step provided by the invention, the top of the top longitudinal beam 7 is separated from the pouring of the middle lower part of the top longitudinal beam 7, so that the pouring compactness of the top longitudinal beam 7 can be improved, and the top of the top longitudinal beam 7 is prevented from generating a cavity.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (13)
1. A construction method of a large-volume top longitudinal beam in a pilot tunnel is characterized in that a supporting device is adopted, and the supporting device comprises:
a support for supporting a top stringer mold;
one end of the adjusting piece is connected with the supporting piece, the two I-shaped steels are welded together, a hole is reserved between the two I-shaped steels to form the supporting piece, and the adjusting piece is used for adjusting the position of the supporting piece;
the construction method comprises the following steps:
the installation step: the supporting device is used for being installed in the guide hole, and the top longitudinal beam mold is installed on the supporting piece;
and (3) perfusion: the top longitudinal beam mould is used for pouring top longitudinal beam concrete into the top longitudinal beam mould;
a step of removing the mold: the top longitudinal beam mould and the supporting device are dismantled.
2. The construction method according to claim 1, further comprising, before the installing step, the steps of:
a calculation step: and calculating according to the construction condition to obtain the size of the supporting device meeting the construction requirement.
3. The construction method according to claim 2, wherein the calculating step includes:
calculating the distance between the bottom of the top longitudinal beam and the bottom of the pilot tunnel;
determining the size of the supporting device;
and (5) checking the strength, rigidity and stability of the supporting device.
4. The construction method according to claim 1, wherein the top longitudinal beam mold comprises a top longitudinal beam bottom mold and a top longitudinal beam side mold, and the installing step comprises:
a processing support device;
installing a supporting device in the pilot tunnel;
and (4) mounting the bottom die of the top longitudinal beam on the supporting device, binding steel bars and mounting the side die of the top longitudinal beam.
5. The construction method according to claim 4, wherein the processing support device comprises:
the screw rod is sleeved with the nut, so that the screw rod and the nut jointly form an adjusting piece, and one end of the screw rod extends into a hole between the two I-shaped steels.
6. The construction method according to claim 5, wherein the stripping step comprises:
and after the top longitudinal beam concrete reaches the stripping condition, loosening a screw rod on the supporting device, reserving a space for stripping the top longitudinal beam mold, and stripping the top longitudinal beam mold and the supporting device.
7. The construction method according to claim 5, wherein a plurality of holes are reserved in the length direction of the I-beam when the two I-beams are welded together.
8. The construction method according to claim 5, wherein the processing support device further comprises:
and one end of the screw rod, which is far away from the I-shaped steel, is connected with the channel steel.
9. The construction method according to claim 8, wherein the installing the support device in the pilot tunnel comprises:
paving square timbers in the guide holes along the length direction of the top longitudinal beam;
the channel steel is matched with the square timber.
10. The construction method according to claim 4, wherein a plurality of adjustment members and a plurality of support members are provided in a length direction of the roof side rail.
11. The construction method according to claim 10, wherein a distance between two adjacent regulating members in a length direction of the top longitudinal beam is 100mm to 600 mm.
12. The construction method according to claim 4, wherein the top longitudinal beam side mold is provided with a side pouring hole;
the step of perfusing comprises:
pouring back-dragging steel pipes into the concrete at the top of the pre-buried top longitudinal beam, wherein the back-dragging steel pipes are arranged along the length direction of the top longitudinal beam;
pouring concrete at the middle part and the lower part of the top longitudinal beam from the side pouring holes;
and pouring concrete at the top of the top longitudinal beam into the pre-buried back dragging steel pipe, and dragging the back dragging steel pipe.
13. The construction method according to claim 12, wherein the pouring step further comprises:
embedding a backfill grouting steel pipe, wherein the backfill grouting steel pipe is distributed along the height direction of the top longitudinal beam, and one end of the backfill grouting steel pipe is positioned at the top of the top longitudinal beam;
and after the back-dragging steel pipe finishes the concrete pouring of the top longitudinal beam, carrying out the top backfill grouting of the top longitudinal beam through the backfill grouting steel pipe.
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| CN201810207640.8A CN108506032B (en) | 2018-03-14 | 2018-03-14 | Construction method of large-volume top longitudinal beam in pilot tunnel |
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| CN201810207640.8A CN108506032B (en) | 2018-03-14 | 2018-03-14 | Construction method of large-volume top longitudinal beam in pilot tunnel |
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| CN105926672B (en) * | 2016-05-06 | 2018-05-18 | 中铁十六局集团地铁工程有限公司 | A kind of Underground Subway Station steel pipe column construction method |
| CN207109856U (en) * | 2017-08-24 | 2018-03-16 | 中铁十七局集团上海轨道交通工程有限公司 | Piping lane, culvert construction hydraulic steel formwork jumbo |
| CN107599149B (en) * | 2017-08-31 | 2019-09-03 | 中交第四航务工程局有限公司 | Template method of adjustment when a kind of curved section is immersed tube prefabricated |
| CN107724672A (en) * | 2017-10-18 | 2018-02-23 | 中国五冶集团有限公司 | A kind of steel construction skyscraper cast-in-situ floor formwork support structure |
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2018
- 2018-03-14 CN CN201810207640.8A patent/CN108506032B/en active Active
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