CN111535823B - Shield construction method for pipe gallery working well - Google Patents
Shield construction method for pipe gallery working well Download PDFInfo
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- CN111535823B CN111535823B CN202010543343.8A CN202010543343A CN111535823B CN 111535823 B CN111535823 B CN 111535823B CN 202010543343 A CN202010543343 A CN 202010543343A CN 111535823 B CN111535823 B CN 111535823B
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- 238000010276 construction Methods 0.000 title claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 47
- 239000010959 steel Substances 0.000 claims abstract description 47
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 230000000977 initiatory effect Effects 0.000 claims abstract description 14
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 13
- 230000005641 tunneling Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000002689 soil Substances 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 230000002787 reinforcement Effects 0.000 abstract description 6
- 230000001976 improved effect Effects 0.000 abstract description 5
- 230000007547 defect Effects 0.000 abstract description 2
- 230000008093 supporting effect Effects 0.000 abstract description 2
- 238000009434 installation Methods 0.000 description 7
- 239000000945 filler Substances 0.000 description 6
- 239000004744 fabric Substances 0.000 description 3
- 238000005429 filling process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000013102 re-test Methods 0.000 description 1
- 238000012954 risk control Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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 OR ROCK 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
- E21D11/18—Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/14—Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to the field of shield construction, in particular to a shield construction method for a pipe gallery working well. And reserving steel plate positions on two sides of the portal according to the central line of the wellhead tunnel to install portal connection steel rings, installing the straight sleeve in the working well, connecting the portal connection steel rings and the corresponding two ends of the straight sleeve in a buckling manner to form a channel between the portals on two sides, welding and sealing a buckle gap after the buckle is completed, and supporting, reinforcing, filling slag and checking the straight sleeve. When the shield machine tunnels in the straight sleeve, the shield segment is sealed and looped by the improved light segment. The shield construction method overcomes the defects of complex reinforcement, poor sealing effect and high cost of the shield construction receiving end and the initiating end in the prior art.
Description
Technical Field
The invention relates to the field of shield construction, in particular to a shield construction method for a pipe gallery working well.
Background
In the construction of the tunnel between the shield method intervals of the urban pipe gallery engineering, the number of working wells is large, the distance between the working wells is short, the receiving and starting of a shield machine are key processes in the whole engineering, the receiving and starting of the shield machine are also the links with the largest difficulty and the highest risk, and the shield machine is particularly the difficult point of risk control in a permeable stratum which is easy to gush water and sand. The existing tunnel outlet sealing mode of the shield machine mainly adopts tunnel portal rubber curtain cloth and a tunnel portal pressing plate to seal a tunnel portal, and also adopts a freezing method to reinforce a stratum so as to achieve a certain sealing effect. If the tunnel portal is sealed by the tunnel portal rubber curtain cloth and the tunnel portal pressure plate, the sealing effect is poor, the construction is complicated and the installation work amount is large due to the fact that the sealing plates are arranged in blocks and gaps among the plates are large; the stratum is reinforced by adopting a freezing method, the sealing effect is better than that of a method of sealing the opening by adopting the opening rubber curtain cloth and the opening pressing plate, but the energy waste is serious, the construction period is long, and the cost is high.
Disclosure of Invention
The invention aims to overcome the defects of complicated reinforcement, poor sealing effect and high cost of the end heads of the receiving end and the initiating end of the shield construction in the prior art, and provides a shield construction method for a pipe gallery working well.
In order to achieve the above purpose, the invention provides the following technical scheme:
a shield construction method for a pipe gallery working well comprises the following steps:
a. determining a center line of a wellhead tunnel in a foundation pit, and respectively installing portal connection steel rings at the receiving end and the portal reserved steel plate of the initiating end;
b. assembling a straight sleeve in the working well, and respectively connecting two ends of the straight sleeve after the assembling is finished with the corresponding portal connecting steel rings;
c. checking the sealing performance of the straight sleeve, arranging a transverse support outside the straight sleeve barrel, arranging a force transmission frame below the straight sleeve, pouring a concrete cushion layer at the bottom in the straight sleeve, filling muck into the straight sleeve and checking the pressure in the straight sleeve;
d. tunneling in the straight sleeve by the shield tunneling machine, assembling the duct pieces in the tunneling process, and removing the duct pieces after the tunnel passing is finished;
the straight sleeve comprises first sleeves connected with a receiving end or an initiating end respectively, at least one second sleeve is arranged between the two first sleeves, and a feeding hole is formed in the straight sleeve.
The portal connecting steel rings are respectively arranged at a portal reserved steel plate at a receiving end and a portal reserved steel plate at an initiating end, the two first sleeves are respectively positioned at the left end and the right end of the straight sleeve and are respectively connected with the portal connecting steel rings at the two ends of the working well, the number of the second sleeves is determined according to the length of the working well in the middle, and the longer the working well is, the more the second sleeves are. The straight sleeve is communicated with the holes at the two ends of the receiving end and the initiating end of the working well, the end reinforcement link of the receiving end and the end of the initiating end is solved once, construction is simplified, a small gap is formed by connection, the gap can be sealed in a welding mode and the like, the sealing effect is good, the straight sleeve can be reused, and cost is saved. The transverse support and the force transmission frame are arranged, so that the straight sleeve is more stable when the shield tunneling machine tunnels in the straight sleeve. In order to prevent the head of the shield tunneling machine from being planted in the straight sleeve after the shield tunneling machine goes out of the tunnel, the concrete cushion layer is poured at the bottom in the straight sleeve. The feeding hole in the straight sleeve is used for filling muck into the straight sleeve, the feeding hole can be reserved when the first sleeve or the second sleeve is manufactured, and the straight sleeve can also be manufactured after being installed on site. In current shield construction, C50 concrete segment commonly used, this application the shield constructs the machine and assembles in the tunnelling the segment passes through, because of the segment is used for protecting the shield structure machine, needs to demolish after the shield structure finishes the segment, so that dismantle straight sleeve, the event need not the segment slip casting behind one's back.
Preferably, the steel ring periphery is connected to the door to a cave is provided with the buckle, first sleeve includes that sleeve and first sleeve down on the first, the second sleeve includes that sleeve and second sleeve down on the second, first sleeve and second sleeve periphery all are provided with vertically and hoop gusset, first sleeve has the draw-in groove with the terminal surface that receiving terminal or originated the end to link to each other, the draw-in groove is L type structure, the draw-in groove includes axial section and circumference section.
The first sleeve and the second sleeve are formed in a segmented mode, manufacturing is facilitated, and torsional strength of the straight sleeve is improved due to the fact that the rib plates are arranged longitudinally and annularly. The notch is "L" type, circumference section direction is opposite with shield structure machine cutter head direction of rotation, when straight sleeve and portal connection steel ring are connected, the buckle on the portal connection steel ring gets into earlier the axial section will again straight sleeve is rotatory back (direction of rotation is the same with shield structure machine cutter head direction of rotation), the buckle gets into the circumference section, so then straight sleeve is along the axial and along shield structure machine cutter head direction of rotation rigidity.
Preferably, the step b comprises the following steps:
b1, hoisting the first lower sleeve at the two ends of the receiving end and the initiating end to descend the well, and enabling the center of the first lower sleeve to be superposed with the center line of the wellhead tunnel;
b2, installing a seal at the interface of the first lower sleeve and the first upper sleeve;
b3, hoisting the first upper sleeve and descending the well to be connected with the joint surface of the corresponding first lower sleeve;
b4, after the first sleeves at the receiving end and the starting end are connected, installing all the second sleeves, and splicing and connecting the second sleeves to form the straight sleeve;
b5, translating the straight sleeve to enable the buckle to enter the axial section firstly, rotating the straight sleeve to enable the buckle to enter the circumferential section, and completing buckling;
b6, sealing the gaps between the straight sleeve and the reserved steel plate of the tunnel portal and the gaps between the straight sleeve and the connecting steel ring of the tunnel portal.
The sealing member improves straight sleeve leakproofness, and the buckle is connected and is increased joint strength, installs earlier and is close to receiving terminal and originated first sleeve, install all middle part again the second sleeve, the telescopic installation order of second can both ends to middle installation also can be installed by one side to the another side, conveniently adjusts the gap. The buckle on the portal connection steel ring firstly goes into the axial section, will again straight sleeve rotatory back, the buckle gets into the circumference section, so then straight sleeve is along the axial and along shield structure machine blade disc direction of rotation rigidity.
Preferably, the first upper sleeve, the first lower sleeve, the second upper sleeve and the second lower sleeve are Q235 castings, and the longitudinal rib plates and the circumferential rib plates are Q235 members and are welded to the peripheries of the first upper sleeve, the first lower sleeve, the second upper sleeve and the second lower sleeve.
The first upper sleeve, the first lower sleeve, the second upper sleeve and the second lower sleeve are large in volume and weight, cambered surfaces are formed, casting is adopted for manufacturing, and after casting is completed, the longitudinal rib plates and the annular rib plates are welded on the outer peripheries of the first upper sleeve, the first lower sleeve, the second upper sleeve and the second lower sleeve, so that strength is improved. The Q235 material has good plasticity and toughness, is not easy to generate welding cracks and other tendencies, and has relatively low price and high cost performance.
Preferably, the step c comprises the following steps:
c1, pressing water in the straight sleeve to check the sealing performance until the requirement is met;
c2, arranging the transverse support and force transmission frame outside the straight sleeve;
c3, pouring a concrete cushion layer at the bottom in the straight sleeve, and ensuring that the concrete cushion layer is connected with a soil body in the tunnel door; c4, filling the straight sleeve with the slag soil and compacting the slag soil;
c5, adding water into the straight sleeve again, and checking the pressure until the pressure meets the requirement;
c6, checking the connection position of the portal connection steel ring and the straight sleeve, the circumferential and longitudinal connection position of the straight sleeve and the force-transmitting frame for water leakage.
The water is added into the straight sleeve to apply pressure at the beginning so as to check the sealing performance of the straight sleeve, and after the straight sleeve is filled with muck, the water is added continuously to apply pressure so as to enable the soil pressure in the straight sleeve to meet the requirement. By adopting the mode, the strength and the sealing property of the straight sleeve connection are ensured, and the guarantee is provided for the subsequent tunneling of the shield tunneling machine.
Preferably, the segment in the step d is a C35-C45 concrete member, the thickness of the segment is 15-25cm, and the segment is provided with a layer of reinforcing bars.
The segment in the straight sleeve is to be removed after the shield is finished, so that the segment is used commonly, waste can be caused, the weight of the segment can be reduced, the manufacturing process can be simplified, the cost is reduced, the weight is light, and the segment is convenient to remove.
Compared with the prior art, the invention has the beneficial effects that:
1. the receiving ends and the originating ends on the two sides of the tunnel portal are connected through the straight sleeve, so that the shield machine can complete receiving and originating in the working well at one time, the construction progress is accelerated, and the efficiency is improved obviously when a plurality of continuous working wells pass through;
2. the straight sleeve is connected with the tunnel door connecting steel ring in a buckling manner, so that the end head connecting quality is improved;
3. the straight sleeve can be recycled, and the cost is reduced.
Description of the drawings:
FIG. 1 is a schematic structural view of a second sleeve in embodiment 1;
FIG. 2 is a schematic view of a first sleeve structure according to embodiment 1;
FIG. 3 is a schematic view of a snap connection structure of the straight sleeve and the steel ring for connecting the portal in embodiment 1;
FIG. 4 is a schematic structural view of a straight sleeve in embodiment 1;
FIG. 5 is a schematic view showing the support and reinforcement of the straight sleeve in example 1;
FIG. 6 is a schematic view of a mortar bed in a straight sleeve according to embodiment 1;
FIG. 7 is a schematic view of a feed port of a straight sleeve in example 1;
FIG. 8 is a schematic diagram of the assembly of a plurality of working well casings of the pipe gallery in embodiment 1;
FIG. 9 is a flow chart of a shield construction method for a pipe gallery working well according to the present invention;
the labels in the figure are: 1-straight sleeve, 11-second sleeve, 12-first sleeve, 121-clamping groove, 2-portal connecting steel ring, 3-transverse support, 4-force transmission frame, 5-concrete cushion layer, 6-feeding hole, 7-grouting pipe and 8-segment
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
As shown in fig. 9, a shield construction method for a pipe gallery working well includes the following steps:
a. determining the center line of a wellhead tunnel in a foundation pit, and respectively installing portal connection steel rings 2 at portal reserved steel plates at a receiving end and an initiating end;
b. assembling a straight sleeve 1 in a working well, and respectively connecting two ends of the straight sleeve 1 with the corresponding portal connecting steel rings 2 after the assembling is finished;
c. checking the tightness of the straight sleeve 1, arranging a transverse support 3 outside the straight sleeve 1, arranging a force transmission frame 4 below the straight sleeve 1, pouring a concrete cushion 5 at the bottom in the straight sleeve 1, filling slag into the straight sleeve 1 and checking the pressure in the straight sleeve 1;
d. the shield machine tunnels in the straight sleeve 1, segments 8 are assembled in the tunneling process, and the segments 8 are removed after the tunnel is passed;
as shown in fig. 1-2, the straight sleeve 1 includes a first sleeve 12 connected to a receiving end or an initiating end, respectively, and at least a second sleeve 11 is disposed between the first sleeves 12, and the straight sleeve 1 has a feeding port 6.
The concrete, at first, determine well head tunnel central line in the foundation ditch, reserve steel sheet department installation portal at the portal and connect steel ring 2, 2 peripheral welding of portal connection steel ring have eight the buckle, the buckle is diameter 60mm, length 10 cm's Q235 pole, the buckle distributes according to circumference equidistance.
Secondly, the straight sleeve 1 is installed, the total length of the cylinder body of the straight sleeve 1 is matched with the length (including a sealing element formed by assembling) between the portal doors on two sides in the working well, the inner diameter is 6700mm, and the outer diameter is 7040 mm. According to the total length, the straight sleeve 1 can be divided into four sections (each section is 2500mm) in the longitudinal direction, wherein the first sleeve 12 has two sections, the second sleeve 11 has three sections between the two first sleeves 12, the first sleeve 12 and the second sleeve 11 can be divided into an upper semicircle and a lower semicircle, the thickness of the first sleeve 12 and the second sleeve 11 is 20mm, the material can be Q235, and the straight sleeve can be formed by casting due to large volume and weight and the cambered surface. Longitudinal rib plates and circumferential rib plates are welded on the periphery of the semicircle to ensure the rigidity of the cylinder body, and the rib plates are 20mm thick, 130mm high and about 580 x 600mm apart. The end face of the first sleeve 12 connected to the receiving end or the initiating end is provided with a clamping groove 121, the clamping groove 121 is L-shaped, and the clamping groove 121 comprises an axial section (the direction is indicated by an arrow a in fig. 3) and a circumferential section (the direction is indicated by an arrow B in fig. 3), and the direction of the circumferential section is opposite to the rotation direction of the shield machine cutter. The installation steps of the straight sleeve 1 are that according to the center line of the wellhead tunnel, namely the installation reference position of the straight sleeve 1, first lower sleeves (the portals on two sides can be simultaneously installed) of the first sleeves 12 at the portals on two sides are placed downwards, the center of the first lower sleeve is coincided with the center line of the wellhead tunnel determined in advance, a rectangular flange is welded at the joint surface of the first lower sleeve and the first upper sleeve, a rubber sealing gasket with the thickness of 10mm is placed on the joint surface of the first lower sleeve and the first upper sleeve, and the flange is made of a Q235 steel plate with the thickness of 40 mm. The rectangular flanges are connected and positioned by positioning pins, the first upper sleeve is hoisted and lowered into the well after the first lower sleeve is connected and installed, the positions of the upper part and the lower part of the first sleeve 12 are positioned by the positioning pins, and the first lower sleeve and the first upper sleeve are connected by M30 and 8.8-level bolts; after the first sleeves 12 at the two side holes are installed, the middle second sleeves 11 are installed, flanges are welded between the first sleeves 12 and the second sleeves 11, between two adjacent second sleeves 11, between the upper semicircle and the lower semicircle of the second sleeves 11, rubber sealing gaskets with the thickness of 10mm are placed and connected through high-strength bolts. A quick cement layer with the thickness of 20mm is coated on the inner wall of the joint of the cylinder body to play a role in sealing the inner side, and the straight sleeve 1 after being connected is shown in figure 4. A rubber sealing gasket of 20mm is arranged outside the portal connection steel ring and clings to the portal reserved steel plate and is used for sealing between the straight sleeve 1 and the portal reserved steel plate; will connect straight sleeve 1 utilize 100t hydraulic jack to follow tunnel central line to portal direction translation, as the direction of arrow A in figure 3 shows, and keep wellhead tunnel central line with straight sleeve 1 central line does not deviate, through measuring group to central line retest, after confirming no mistake, on portal connection steel ring 2 the buckle is advanced to get into the axial section, will again straight sleeve 1 is rotatory, and the direction of rotation is the same with shield structure machine cutter circle direction of rotation, as the direction of arrow B in figure 3 shows, the buckle gets into circumferential section, so then straight sleeve is along axial and along shield structure machine cutter head direction of rotation rigidity. Straight sleeve 1 is connected the back with the buckle of portal connection steel ring 2, will inspect whether rubber packing pad is whole can connect reliably, because the portal steel sheet is out of shape or the great condition of flatness deviation probably appears at pre-buried in-process, so probably appear straight sleeve 1 has some places can't be with the portal reserve the condition that the steel sheet is sealed, just at this moment need be behind the rubber packing pad of these gaps department (lean on portal side) fill rapid-curing cutback grout, plug up the gap. Add diameter 10 mm's round steel on the hoop gap between 1 top of straight sleeve and the portal connection steel ring 2 the inboard annular steel sheet that welds 20cm wide 20mm thick that adds of straight sleeve makes it will straight sleeve 1 and portal connection steel ring 2 full weld welding (the welding seam should adopt magnetic particle inspection, ensures its welding quality's plumpness leakproofness).
And then, supporting and reinforcing the straight sleeve 1, filling muck and inspecting. After the straight sleeve 1 is assembled, water is pressed in the straight sleeve 1 to check the tightness, the air pressure is 0.2Mpa, if the pressure is kept at 0.18Mpa within 12 hours, the requirement of receiving starting can be met, if the pressure is less than 0.18Mpa, a water leakage part is found out, the sealing quality of the water leakage part is checked and repaired, and then pressure testing is carried out again until the requirement of pressure testing is met. The installation of the force-transmitting frame 4 at the bottom of the straight sleeve 1 and the lateral transverse supports 3 is then carried out. The force transmission frame 4 is positioned below the straight sleeve 1, and a pair of force transmission frames 4 are arranged at each 1.25 m. The transverse support 3 is positioned on the outer circumference of the straight sleeve and is divided into an upper part and a lower part, and the transverse support 3 is axially arranged according to 2m, as shown in figure 5. Because there is not the riding wheel in the straight sleeve 1, for prevent after the shield constructs the machine goes out the hole take place the crop phenomenon in the straight sleeve 1 the bottom 60 within ranges pours 15cm thick C20 concrete cushion 5 in the straight sleeve 1 to guarantee that the concrete cushion stretches into in the tunnel door and meets with the reinforcement soil body, can not plant the head at the front end when guaranteeing the cutter head to go out the reinforcement body, see fig. 6. The top of the straight sleeve 1 is provided with 2 circular feed inlets 6 with the diameter of 600mm, and grouting pipes 7 are reserved in the feed inlets 6, as shown in figure 7. After the tightness inspection is finished, filling muck into the straight sleeve 1, and properly adding cement mortar in the filling process to ensure the compactness of the muck. Filling is carried out from two circular feed inlets 6 with the diameter of 600mm until the material is filled, and then water is added until the sleeve is completely filled. In order to compact and uniform the filler in the straight sleeve 1, the front and rear feed inlets 6 are respectively filled in the filling process to ensure uniform distribution, the filling process is carried out in stages, a person is sent to observe the feed inlets, the filler is required to be flattened and compacted when the filler is filled to a certain height, water can be added into the sleeve while the filler is filled, then bentonite is properly added to play a role in lubrication, and the filler is continuously filled until the whole straight sleeve 1 is completely filled after the filler is flattened. And adding water into the straight sleeve 1, checking the pressure after the straight sleeve is fully filled with water, and stopping adding water and maintaining the pressure to be stable if the pressure can reach 3 bar. And if the water pressure can not reach 3bar, the water pipe is untied, air pressure is added into the straight sleeve by using an air compressor until the pressure reaches 3bar, and all connection parts are checked, including the connection part of the portal connection steel ring 2 and the straight sleeve 1, the annular and longitudinal connection position of the straight sleeve 1 and the connection part of the straight sleeve 1 and the force transmission frame 4, whether water leakage exists or not is detected.
Finally, as shown in fig. 8, the shield machine tunnels through the straight sleeve 1, in order to meet the requirements of site construction and ensure the operation safety of the shield machine in the straight sleeve 1, the duct piece 8 needs to be installed in the shield tunneling process, and the shield machine needs to be removed after the shield tunneling process is finished. The existing duct piece 8 is high in weight and concrete strength, and resources are wasted. The duct piece 8 may be used as follows: changing the thickness of the original duct piece 8 from 30cm to 20 cm; reducing the reinforcing bars in the prefabricated duct piece 8, and reducing the reinforcing bars from two layers to one layer; c50 waterproof concrete is changed into C35 concrete; and the back grouting work of the duct piece 8 is cancelled. Through the improvement to the section of jurisdiction 8 has greatly reduced the dead weight that the section of jurisdiction 8 brings, provides favourable help for demolising of later stage, and economic investment also reduces than before.
Claims (4)
1. A shield construction method for a pipe gallery working well is characterized by comprising the following steps:
a. determining the center line of a wellhead tunnel in a foundation pit, and respectively installing portal connection steel rings (2) at portal reserved steel plates at a receiving end and an initiating end;
b. assembling a straight sleeve (1) in a working well, and respectively connecting two ends of the straight sleeve (1) with the corresponding portal connection steel rings (2) after the assembling is finished;
c. checking the tightness of the straight sleeve (1), arranging a transverse support (3) outside a cylinder body of the straight sleeve (1), arranging a force transmission frame (4) below the straight sleeve (1), pouring a concrete cushion layer (5) at the bottom in the straight sleeve (1), filling slag into the straight sleeve (1) and checking the pressure in the straight sleeve (1);
d. the shield machine tunnels in the straight sleeve (1), segments (8) are assembled in the tunneling process, and the segments (8) are removed after the tunnel is passed;
the straight sleeve (1) comprises first sleeves (12) connected with a receiving end or an initiating end respectively, at least one second sleeve (11) is arranged between the two first sleeves (12), a feed inlet (6) is formed in the straight sleeve (1), a buckle is arranged on the periphery of the portal connection steel ring (2), each first sleeve (12) comprises a first upper sleeve and a first lower sleeve, each second sleeve (11) comprises a second upper sleeve and a second lower sleeve, longitudinal and annular rib plates are arranged on the peripheries of the first sleeves (12) and the second sleeves (11), a clamping groove (121) is formed in the end face, connected with the portal connection steel ring (2), of each first sleeve (12), each clamping groove (121) is of an L-shaped structure, and each clamping groove (121) comprises an axial section and a circumferential section;
the step b comprises the following steps:
b1, hoisting the first lower sleeve at the two ends of the receiving end and the initiating end to descend the well, and enabling the center of the first lower sleeve to be superposed with the center line of the wellhead tunnel;
b2, installing a seal at the interface of the first lower sleeve and the first upper sleeve;
b3, hoisting the first upper sleeve and descending the well to be connected with the joint surface of the corresponding first lower sleeve;
b4, translating the straight sleeve (1) to enable the buckle to enter the axial section firstly, rotating the straight sleeve (1) to enable the buckle to enter the circumferential section, completing the buckle, connecting the first sleeves (12) at the receiving end and the originating end, installing all the second sleeves (11), and splicing and connecting the second sleeves to form the straight sleeve (1);
b5, sealing the gaps between the straight sleeve (1) and the reserved steel plate of the tunnel portal and between the straight sleeve (1) and the tunnel portal connecting steel ring (2).
2. A shield construction method for a pipe corridor working well according to claim 1, characterized in that the first upper sleeve, the first lower sleeve, the second upper sleeve and the second lower sleeve are Q235 castings, and the longitudinal and circumferential ribs are Q235 members and welded to the outer circumference of the first upper sleeve, the first lower sleeve, the second upper sleeve and the second lower sleeve.
3. A method of shield construction of a pipe corridor working well according to claim 1, said step c comprising the steps of:
c1, pressing water in the straight sleeve (1) to check the sealing performance until the requirement is met;
c2, arranging the transverse support (3) and the force-transmitting frame (4) outside the straight sleeve (1);
c3, pouring the concrete cushion layer (5) at the bottom in the straight sleeve (1), and ensuring that the concrete cushion layer (5) is connected with the soil body in the tunnel portal;
c4, filling the straight sleeve (1) and compacting the slag soil;
c5, adding water into the straight sleeve (1), and checking the pressure until the pressure meets the requirement;
c6, checking the connection position of the portal connection steel ring (2) and the straight sleeve (1), the circumferential and longitudinal connection position of the straight sleeve (1), and the connection position of the straight sleeve (1) and the force-transmitting frame (4) for water leakage.
4. A shield construction method for a pipe gallery working well according to any one of claims 1 to 3, characterized in that said segment (8) in said step d is a C35-C45 concrete member, said segment (8) has a thickness of 15-25cm, and said segment (8) is provided with a layer of reinforcing bars.
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| CN111535823A (en) | 2020-08-14 |
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