CN110735651B - Self-compacting concrete pouring construction method for through-hole pipe - Google Patents
Self-compacting concrete pouring construction method for through-hole pipe Download PDFInfo
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- CN110735651B CN110735651B CN201910860587.6A CN201910860587A CN110735651B CN 110735651 B CN110735651 B CN 110735651B CN 201910860587 A CN201910860587 A CN 201910860587A CN 110735651 B CN110735651 B CN 110735651B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/107—Reinforcing elements therefor; Holders for the reinforcing elements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/14—Lining predominantly with metal
Abstract
The invention provides a self-compacting concrete pouring construction method for a through hole pipe, which comprises the following steps: s1: welding a plurality of sequentially connected large-caliber steel pipes, arranging the large-caliber steel pipes into a tunnel lining cavity, and plugging the steel pipes at two ends by adopting end templates; s2: the pump pipe connected with the pump truck extends into the steel pipe; s3: each steel pipe is provided with a concrete pouring hole at the top of the steel pipe, and a connecting pipe arranged at the pouring hole is connected with the pump pipe through a hose; s4: pouring and forming from the middle to the two ends by adopting two pump trucks, and pouring in two layers, wherein the first layer of concrete pouring is pouring from bottom to top to the range of 180 degrees of the central line of the pipe, and the second layer of concrete pouring is sequentially and sectionally pouring from the middle steel pipe to the steel pipes at the two ends; s5: the self-compacting concrete has high flowability and self-compacting performance, and is self-weight flowing without vibration. The invention ensures the installation progress of the steel pipe and shortens the construction period; and the construction cost is reduced.
Description
Technical Field
The invention relates to a construction method of self-compacting concrete, in particular to a construction method of self-compacting concrete for a through hole pipe.
Background
Technical background: self-compacting concrete originated from professor okamut of university of tokyo, japan in 1988, and the development impetus was that "reduction of skilled workers in japan would certainly have a negative impact on the durability of the concrete structure", which was called self-compacting concrete in 1996 at the time of university of texas, usa. Compared with the traditional concrete, the self-compacting concrete has the advantages that the using amount of coarse aggregate is less, the using amount of powder is increased, the ratio of water to the using amount of powder is far smaller than the water-cement ratio of the conventional concrete, and the flowability can be greatly improved under the condition of not increasing the water consumption per unit volume due to the addition of the high-performance water reducing agent. The concrete has high fluidity, clearance permeability and segregation resistance, can be uniformly and compactly molded only under the action of the dead weight of the concrete without vibration during pouring, and has high durability and high volume stability. When the operation space is narrow and the vibration is difficult, the self-compacting concrete body shows the superiority.
In the prior art, when a large-diameter steel pipe is constructed in a tunnel lining cavern, concrete pouring holes are formed at 3 points, 9 points and 12 points of the steel pipe by adopting a construction method of steel pipe hole opening and separated-bin pouring, and after 24m steel pipes are fixedly installed in a tunnel, self-compacting concrete is poured in separated bins.
However, the technical scheme has the following disadvantages:
(1) the casting times are increased due to the sectional casting, and the construction period is long;
(2) due to the segmented pouring, the pipeline installation is also performed in a segmented manner, the installation workload of the steel pipes in the cavern is increased, the steel pipes in the cavern are difficult to install compared with the steel pipes outside the cavern, and the engineering cost is increased;
(3) the pump pipes are required to be installed and disassembled each time of pouring, the end templates are installed each time, and the labor, material and equipment costs are high;
(4) the treatment of the segmented joints is difficult, and the concrete is broken at the joints, so that the integrity is poor.
Disclosure of Invention
The invention provides a self-compacting concrete pouring construction method for a through hole pipe, which solves the problems of high labor, material and equipment cost caused by the fact that a pump pipe needs to be installed and detached during multiple pouring, and solves the problems of long engineering time consumption and high cost, and the technical scheme is as follows:
a construction method for self-compacting concrete pouring of a hole penetrating pipe comprises the following steps:
s1: welding a plurality of sequentially connected large-diameter steel pipes, arranging the large-diameter steel pipes into a tunnel lining cavern, plugging the steel pipes at two ends by using end templates, and reserving vent holes at the tops of the plugged end templates;
s2: pump trucks are arranged outside vertical shafts at two ends of the tunnel lining cavern, and pump pipes connected with the pump trucks extend into the steel pipes;
s3: each steel pipe is provided with a concrete pouring hole at the top of the steel pipe, and a connecting pipe is arranged at the pouring hole and connected with the pump pipe through a hose;
s4: the self-compacting concrete pouring adopts a pouring mode that two pump trucks pour and form from the middle to two ends, the pouring is divided into two layers, the first layer of concrete pouring is from bottom to top to the 180-degree range of the central line of the steel pipe, and the second layer of concrete pouring is the subsection pouring which is sequentially carried out from the middle steel pipe to the steel pipes at two ends;
s5: after the sectional pouring is finished, the self-compacting concrete can flow by means of the self-weight of the self-compacting concrete by utilizing the high fluidity and the self-compacting performance of the self-compacting concrete, and the self-compacting concrete can be compacted without vibrating.
Further, in step S1, the end formwork is disposed at the opening between a lining concrete and the steel pipe, and includes a bamboo plywood, reinforcing steel rings, and square wood ribs, the bamboo plywood covers the opening, the outer side of the bamboo is reinforced by a plurality of reinforcing steel rings and square wood ribs, the square wood ribs are located in the radial direction of the steel pipe, and the reinforcing steel rings and the steel pipe are concentric.
Further, in step S2, the pump pipe located outside the tunnel lining cavity is fixed by a fixing pipe clamp, and the pump pipe located inside the tunnel lining cavity is weighted by a sand bag.
Further, in step S3, a reinforcing plate is additionally disposed at the opening of the casting hole, the reinforcing plate is placed on the outer wall of the steel pipe, the reinforcing plate and the inner wall of the steel pipe are fixed by the pipe hoop, and the pipe hoop and the reinforcing plate are made of the same material as the steel pipe.
Further, in step S3, the joint between the connection tube and the hose and the joint between the hose and the pump tube are all fixedly connected by using a tube clip.
Further, in step S4, the position between the two steel pipes at the center of the tunnel lining cavern is determined as the casting center, and the positions of the concrete casting holes on the steel pipes are both close to the casting center side.
Further, in the second layer of concrete pouring in the step S4, when the pouring hole at the front end steel tube is poured, the subsequent adjacent hole to be poured and the backfill grouting hole are used as exhaust holes; when concrete overflows from the adjacent pouring holes, immediately stopping pouring of the front-end pouring hole, sealing by adopting a plug, and moving to the adjacent to-be-poured hole for pouring; and then taking the subsequent hole to be poured and the backfill grouting hole adjacent to the current pouring hole as an exhaust hole, exhausting, and repeating the steps until the steel pipe in the direction is completely poured.
Furthermore, the hole of waiting to pour and backfill the grout hole on insert the PVC pipe respectively, be provided with the recess on the PVC pipe, groove depth, groove width are 2cm, and the concrete passes through the recess and gets into this hole of waiting to pour.
Further, before self-compaction concrete pouring, vertical supports are arranged in the steel pipe every 5m, round timbers with the diameter of 15cm are adopted for the supports, the round timbers are arranged in the steel pipe where the first 3 pouring holes are formed, the stress and deformation conditions of the round timbers are observed during pouring, if the stress and deformation of the round timbers are not changed greatly, the subsequent supports are cancelled, so that concrete pouring is facilitated, and otherwise, the arrangement of the round timbers cannot be cancelled.
Further, before the self-compacting concrete is poured, a measurer measures the interior of the steel pipe once, monitors a section of the steel pipe every 1m, and reserves original data; when concrete is poured into each pouring hole, measuring the front and back of each pouring hole in real time, comparing the measured values with original data, and observing the deformation condition in the steel pipe; and after the pouring is finished, measuring again, and observing the final deformation condition in the steel pipe.
The invention has the following advantages:
(1) the installation progress of the steel pipe is guaranteed, and self-compacting concrete pouring can be performed after the steel pipe is installed once;
(2) the integrity of the poured concrete can be ensured;
(3) the construction period can be shortened;
(4) the construction cost can be reduced, only the end part template is required to be installed once in one-time pouring, the pump truck and the pump pipe are installed and disassembled once, and the construction cost is greatly reduced.
(5) The installation quality of the steel pipes is guaranteed, the self-compacting concrete pouring can be performed after the steel pipes are completely installed, the steel pipes can be welded outside the caverns, and the opening quality of the steel pipes is guaranteed.
Drawings
FIG. 1 is a cross-sectional view of the end form;
FIG. 2 is a sectional view of the inner support of the steel tube;
FIG. 3 is a schematic view of the self-compacting concrete placement of the present invention;
FIG. 4 is a hole site layout diagram of a section of DN2600 concrete filled steel tube pouring hole;
FIG. 5 is a layout view of concrete pouring holes of the steel pipe;
FIG. 6 is a dimensional schematic of FIG. 5;
FIG. 7 is an enlarged schematic view at A in FIG. 3;
FIG. 8 is a schematic view of the layered placement of self-compacting concrete;
FIG. 9 is a schematic view of a self-compacting concrete segment cast after a layered cast;
FIG. 10 is a schematic view of the notching of PVC pipe.
Detailed Description
In the tunnel lining cavern, a plurality of heavy-calibre steel pipes that connect gradually are arranged and are accomplished, and the steel pipe outside at both ends adopts the tip template to carry out the shutoff, and the steel pipe adopts DN2600 steel pipe. As shown in fig. 1, in order to ensure the plugged end formwork to be compact and not leak slurry, the end formwork is manufactured as follows:
an end template is arranged at an opening between a lining concrete 1 and a steel pipe 2, the end template is plugged by a bamboo plywood 3 with the thickness of 2cm, a reinforcing steel ring 4 and square wood ribs 5 are additionally arranged on the outer side of the bamboo plywood 3 for reinforcement, the manufactured bamboo plywood 4 is firmly fixed by the square wood ribs 5 and the reinforcing steel bars 4, and the template is prevented from running when concrete is poured. Wherein, a plurality of square timber ribs 5 are located the radial direction of steel pipe 2, and a plurality of reinforcing bar circles 4 and steel pipe 2 arrange concentrically.
In the embodiment, a vent hole 6 with the diameter of 10cm is reserved at the top of the blocked end formwork and is used for exhausting and observing the pouring condition of concrete. Meanwhile, a silicon core pipe 7 of the light-transmitting cable is arranged on the inner side of the lower part of the lining concrete 1.
As shown in figure 2, before the self-compacting concrete is poured, vertical supports are arranged in the steel pipe 2 at intervals of 5m, and round timbers 10 with the diameter of 15cm are used for supporting. Firstly, 3 casting holes for casting are arranged in the steel pipe, the supporting stress and deformation conditions of the round timber 10 are observed during casting, and if the stress and deformation changes of the round timber 10 are not large, the subsequent support can be cancelled, so that concrete can be cast conveniently. Otherwise the arrangement of the logs 10 cannot be cancelled.
A plurality of uniformly arranged embedded steel plates 8 are arranged below the tunnel lining cavern, pulleys 9 are arranged on two sides of each embedded steel plate 8, and floating stop rods (serial numbers are not shown in the figure) opposite to the pulleys 9 are arranged above the tunnel lining cavern. When the steel pipe 2 enters the tunnel lining cavern, the lower part is supported by the embedded steel plate 8 and the pulley 9, the distance from the upper part to the lining concrete 1 is 0.3m (the distance from the steel pipe to the lining concrete is 0.3m), and the position of the upper part is limited by the floating stopping rod.
As shown in figure 3, pebbles 20 are arranged on the outer side of a lining concrete 1, after a steel pipe 2 is arranged in a tunnel lining cavern formed by the lining concrete 1, the invention carries out pouring by filling C30 self-compacting concrete between the tunnel lining cavern and an inner steel penetrating pipe, the thickness of the self-compacting concrete is 28cm, and the self-compacting concrete is required to be poured for 2.43m per linear meter3/m。
The both ends of tunnel lining hole room are 1# shaft and 2# shaft respectively, and the shaft is arranged outward to have pump truck 11, and pump truck 11 is connected with the pump line 13 of internal diameter 125mm, and when pump line 13 arranged from the upper end to the lower extreme along the edge of shaft, adopt multiunit fixed pipe strap 14 to fix, fixed pipe strap 14 is through being connected fixed pump line 13 with the bracing, and every section length of adjacent fixed pipe strap is 4 m.
After the pump pipe 13 reaches the bottom of the shaft, the square timber 12 with the fixing and supporting functions is arranged at the corner and the horizontal position of the bottom of the shaft, so that the pump pipe 13 is horizontally led into the steel pipe 2 instead of being vertical.
The pump pipe 13 of the tunnel lining cavern outside the hole is fixed by a fixed pipe clamp 14, after entering the hole, the pump pipe 13 is connected with a concrete pouring hole 22 by a connecting pipe 16 and a hose 18 after the sand bag is used for weighting, and the concrete pump pipe 13 is arranged in the steel pipe.
And then, pumping the self-compacting concrete into a warehouse by using a pump truck 11 on the ground, and pouring and molding the self-compacting concrete in one step from the middle to the directions D at two ends by adopting two pump trucks 11.
And a 50mm PVC pipe 21 is also arranged in the tunnel lining cavity and used for longitudinal ventilation.
The self-compacting concrete is conveyed to the outside of the steel pipe 2 through a pouring hole in the steel pipe and enters a gap between the tunnel lining cavity and the inner steel penetrating pipe. Because the pouring is from the middle to the two ends, after the pouring center is determined, the distance between the two pouring holes is 2.0m, because the pouring center is between the two steel pipes, the distance between the two pouring holes formed in the steel pipes at the two ends is the nearest.
The left-side one-stage steel pipe structure shown in fig. 4 is formed by welding three steel pipes together, and each steel pipe 2 has a length L1 of 6m and a total length of 18 m. The adjacent steel pipes are fixed by welding, and a welding seam 23 exists between the steel pipes. 1 DN136 (the diameter is 136mm) concrete pouring hole 22 is arranged at the position of 12 o' clock (the top of the steel pipe) of each steel pipe, and the length L of the concrete pouring hole 22 from the end of each steel pipe is 1.0 m.
As shown in fig. 5 and 6, the steel pipe 2 is perforated by a steel pipe manufacturer in a casting hole 22, the steel pipe manufacturer performs the boring, a boring machine is used for the boring, a reinforcing plate 25 and a pipe clamp 29 are additionally arranged at the positions of the holes, and the pipe clamp 29 and the reinforcing plate 25 are made of the same material as the steel pipe 2.
The reinforcing plate 25 is placed at the outer wall 27 of the steel pipe, and has a length L4 mm and a height L2 of 10 mm. After the reinforcing plate 25 is placed, the pipe hoop 29 is used for fixing, the lower end of the pipe hoop 29 is welded and fixed with the inner wall 28 of the steel pipe, the upper end of the pipe hoop 29 is welded and fixed with the reinforcing plate 25, and the height H1 of the welding height 26 is 10 mm.
The length L6 of the opening is 156mm and the width L3 of the pipe clamp 29 is 10mm, so that the casting hole 22 is exactly 136 mm.
The height H2 of the pipe hoop 29 is 50mm, when the steel pipe is transported, the pouring hole 22 can be filled with the plug 24, and the height H3 of the plug 24 is 40 mm.
As shown in fig. 7, when casting is started, the plug 24 is removed, and the connecting pipe 16 is fixedly installed at the casting hole 22, wherein the inner diameter of the connecting pipe 16 is 125mm, the length of the connecting pipe is 300mm, the connecting pipe is divided into an upper threaded sleeve and a lower external threaded pump pipe joint, and the threaded length of the threaded sleeve is 50 mm.
One end of the connecting pipe (with a screw thread sleeve) is directly screwed on the concrete pouring hole pipe hoop 29, the other end (an external screw pump pipe joint) is connected with the hose 18 by adopting an upper pipe clamp 17, and the hose 18 is connected with the pump pipe 13 by adopting a lower pipe clamp 19.
As shown in FIG. 8, the self-compacting concrete casting adopts a casting method that two pump trucks 11 are cast from the middle to two ends, in the embodiment, 17 steel pipes from S1 to S17 are arranged on the left side, 17 casting holes are formed, 16 steel pipes from S1 'to S16' are arranged on the right side, and 16 casting holes are formed. The concrete is conveyed to the pouring hole 22 through the pump pipe 13, the concrete flows to the pouring position along the arc outer wall of the steel pipe automatically, pouring is divided into two layers, each pouring surface adopts double-hose circulating operation, the pouring surface refers to each operation surface poured from the middle to two sides, the double-hose refers to the hose 18, and when the hose 18 is installed and removed, the other pipe continues to be poured. The first layer of concrete pouring (all pouring holes work) is poured to the range of 180 degrees from bottom to top of the central line of the pipe, and the theoretical pouring amount of each pouring hole is calculated according to the arrangement of the pouring holes.
As shown in fig. 9, taking S1-S3 steel pipes as an example, when the second layer of concrete is poured, in order to smoothly exhaust air during pouring, when pouring hole 22 at S1 steel pipe is poured, the next adjacent hole 22 to be poured and backfill grouting hole 33 (backfill grouting hole 33 is provided on each steel pipe, the subsequent self-compacting concrete finally sets to reach 70% of the design strength, and backfill grouting hole 33 is used to supplement the volume loss during concrete hardening) are used as exhaust holes.
And respectively inserting 110mm and 40mm PVC pipes into the subsequent hole to be poured 22 and the backfill grouting hole 33 (the diameter of the pouring hole 22 is 136mm, the inner diameter of the pouring hole 22 is 125mm, then when the PVC pipe with the diameter of 110mm is used, flexible materials are added around the 110mm PVC for sealing, the same principle is applied to the 40mm PVC), wherein the 110mm PVC pipe 31 is inserted into the hole to be poured 22, and the 40mm PVC pipe 32 is inserted into the backfill grouting hole 33.
The PVC pipe is propped against the surface of a lining concrete 1, the top end of the PVC pipe is provided with a groove 34, and the groove depth and the groove width are both 2 cm. When concrete overflows from the pouring hole 22 at the position S1, the pouring of the pouring hole 22 is immediately stopped, the pouring hole 22 at the position S1 is closed by using the pipe plug 24 (the connecting pipe 16 is detached, pouring is completed at the moment, the pipe plug 24 is installed after excessive concrete is manually removed for the concrete entering the pipeline through the pouring hole), and then, after the pouring of the self-compacting concrete is completed, blocking welding is performed. Moving to the hole to be poured 22 of the next S2 pipeline for pouring, exhausting the air by taking the hole to be poured and the backfill grouting hole as an exhaust hole, and repeating the steps until all the holes are poured.
The self-compacting concrete has high flowability and self-compacting performance, and is self-weight flowing without vibration. Before pouring, the self-compaction performance of the concrete is tested, and after the test is qualified, the concrete can be put into a warehouse, and the specific test indexes are as shown in the following table.
Index of self-compacting performance of concrete
After the concrete pump is started, a proper amount of water is pumped to wet the inner walls of a hopper, a piston and a conveying pipe of the concrete pump truck and the like which are directly contacted with the concrete. And (3) after the inspection of pumping water confirms that no foreign matters exist in the concrete pump truck and the conveying pipe, pumping cement mortar with the same mixing ratio as other components except the coarse aggregate in the concrete, lubricating a pump pipe, and pumping self-compacting concrete.
Before the self-compacting concrete is poured, the performance indexes of the self-compacting concrete (slump expansion, T50 time, U-shaped box and V leak) need to be checked, and pumping and warehousing pouring are carried out after the standard control indexes are met.
Before the self-compacting concrete is poured, a measurer measures the interior of the steel pipe once, monitors a section of the steel pipe every 1m, and reserves original data. And when concrete is poured into each pouring hole, measuring the front and back of each pouring hole in real time, comparing the measured values with the original data, and observing the deformation condition in the steel pipe. And after the pouring is finished, measuring again, and observing the final deformation condition in the steel pipe.
The invention has the following beneficial effects:
1. the steel pipe is more convenient and effective to install and construct;
2. the accuracy of steel pipe installation is more accurate;
3. the self-compacting concrete can be poured and formed at one time, so that the construction efficiency is greatly improved;
4. saving the template material and labor, and saving the cost.
The invention has the following characteristics:
innovation points 1: and (4) pouring the self-compacting concrete in full length at one time.
By adopting the construction technology, the self-compacting concrete is poured in full length at one time, labor and materials are saved, the integrity of the self-compacting concrete after pouring is good, and the quality of the concrete is guaranteed.
Innovation points 2: the existing backfill grouting hole is used for exhausting air, so that the construction cost can be saved.
And in order to ensure smooth air exhaust during pouring, the subsequent hole to be poured and the backfill grouting hole are used as exhaust holes. And respectively inserting 110mm and 40mm PVC pipes into the subsequent hole to be poured and the backfill grouting hole, wherein the PVC pipes are propped against a concrete lining surface (the PVC pipes are provided with grooves, and the groove depth and the groove width are both 2 cm). When concrete overflows from the pouring holes, the pouring holes are immediately stopped from pouring, the pouring holes are closed by using the pipe plugs and are moved to the next hole to be poured for pouring, the subsequent holes to be poured and the grouting are used as exhaust holes for exhausting, and the rest is done until the end formwork is reached, and the pouring is finished completely.
Innovation points 3: the steel pipe pouring hole is connected with the pump pipe through a special joint, and the pump pipe is convenient to mount and dismount for construction.
Adopt special connector, one end is twisted steel pipe concrete and is pour the hole, and the other end is connected with the pump line buckle, and the installation, dismantle the pump line easy and simple to handle.
Claims (6)
1. A construction method for self-compacting concrete pouring of a hole penetrating pipe comprises the following steps:
s1: welding a plurality of sequentially connected large-diameter steel pipes, arranging the large-diameter steel pipes into a tunnel lining cavern, plugging the steel pipes at two ends by using end templates, and reserving vent holes at the tops of the plugged end templates;
s2: pump trucks are arranged outside vertical shafts at two ends of the tunnel lining cavern, and pump pipes connected with the pump trucks extend into the steel pipes;
s3: each steel pipe is provided with a concrete pouring hole at the top of the steel pipe, and a connecting pipe is arranged at the pouring hole and connected with the pump pipe through a hose;
s4: the self-compacting concrete pouring adopts a pouring mode that two pump trucks pour and form from the middle to two ends, the position between two steel pipes at the center of a tunnel lining hole is determined as a pouring center, the positions of concrete pouring holes on the steel pipes are close to one side of the pouring center, the pouring is divided into two layers, the pouring holes all work when the first layer of concrete is poured, the first layer of concrete is poured to the range of 180 degrees from bottom to top to the central line of the steel pipes, and the second layer of concrete is sequentially cast in sections from the middle steel pipes to the steel pipes at two ends;
in the second layer of concrete pouring, when pouring is carried out on the pouring hole at the front end steel pipe, the subsequent adjacent hole to be poured and the backfill grouting hole are used as exhaust holes; when concrete overflows from the adjacent pouring holes, immediately stopping pouring of the front-end pouring hole, sealing by adopting a plug, and moving to the adjacent to-be-poured hole for pouring; then taking a subsequent hole to be poured and a backfill grouting hole adjacent to the current pouring hole as an exhaust hole, exhausting, and repeating the steps until all the steel pipes in the direction are poured;
s5: after the sectional pouring is finished, the self-compacting concrete flows by means of the self-weight of the self-compacting concrete by utilizing the high fluidity and the self-compacting performance of the self-compacting concrete, and the self-compacting concrete is compacted without vibration;
before the self-compacting concrete is poured, a measurer measures the interior of the steel pipe once, monitors a section of the steel pipe every 1m, and reserves original data; when concrete is poured into each pouring hole, measuring the front and back of each pouring hole in real time, comparing the measured values with original data, and observing the deformation condition in the steel pipe; after the pouring is finished, measuring again, and observing the final deformation condition in the steel pipe;
before self-compaction concrete pouring, arrange one vertical braces at every 5m in the steel pipe, support and adopt the log of diameter 15cm, arrange in the steel pipe at the first 3 holes of pouring place that carry out the pouring, observe log support stress and the deformation condition during pouring, if the stress and the deformation change of log are little, cancel follow-up support to concrete pouring, otherwise can not cancel the arrangement of log.
2. The through-hole pipe self-compacting concrete pouring construction method according to claim 1, characterized in that: in step S1, the end formwork is disposed at an opening between a lining concrete and a steel pipe, and includes a bamboo plywood, a steel bar ring, and square wood ribs, the bamboo plywood covers the opening, the outer side of the bamboo plywood is reinforced by a plurality of steel bar rings and square wood ribs, the square wood ribs are located in the radial direction of the steel pipe, and the steel bar ring and the steel pipe are concentric.
3. The through-hole pipe self-compacting concrete pouring construction method according to claim 1, characterized in that: in step S2, the pump pipe outside the tunnel lining cavity is fixed by a fixing pipe clamp, and the pump pipe inside the tunnel lining cavity is weighted by a sand bag.
4. The through-hole pipe self-compacting concrete pouring construction method according to claim 1, characterized in that: in step S3, a reinforcing plate is additionally disposed at the opening position of the casting hole, the reinforcing plate is placed on the outer wall of the steel pipe, the reinforcing plate and the inner wall of the steel pipe are fixed by the pipe hoop, and the pipe hoop and the reinforcing plate are made of the same material as the steel pipe.
5. The through-hole pipe self-compacting concrete pouring construction method according to claim 1, characterized in that: in step S3, the joint between the connection pipe and the hose and the joint between the hose and the pump pipe are all fixedly connected by using pipe clamps.
6. The through-hole pipe self-compacting concrete pouring construction method according to claim 1, characterized in that: PVC pipes are respectively inserted into the hole to be poured and the backfilling grouting hole, grooves are formed in the PVC pipes, the groove depth and the groove width are both 2cm, and concrete enters the hole to be poured through the grooves.
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| CN112411296A (en) * | 2020-10-26 | 2021-02-26 | 温州展业建设工程有限公司 | Municipal engineering fair-faced concrete pouring construction method |
| CN112554909B (en) * | 2020-11-27 | 2023-05-05 | 中铁十五局集团有限公司 | Rectangular pipe jacking joint concrete pouring method utilizing separate steel plates |
| CN113446030A (en) * | 2021-08-02 | 2021-09-28 | 深圳市广汇源水利建筑工程有限公司 | Construction method and monitoring system of V-type surrounding rock reinforced primary lining pressure tunnel |
| CN114294471A (en) * | 2021-12-31 | 2022-04-08 | 上海燃气工程设计研究有限公司 | Method for penetrating pipe in sleeve |
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