CN106988757A - The double -side approach construction technology of reserved rock pillar and hanging by bolt combination - Google Patents

The double -side approach construction technology of reserved rock pillar and hanging by bolt combination Download PDF

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Publication number
CN106988757A
CN106988757A CN201710245534.4A CN201710245534A CN106988757A CN 106988757 A CN106988757 A CN 106988757A CN 201710245534 A CN201710245534 A CN 201710245534A CN 106988757 A CN106988757 A CN 106988757A
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CN
China
Prior art keywords
pilot tunnel
arch
side
reserved
rock pillar
Prior art date
Application number
CN201710245534.4A
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Chinese (zh)
Inventor
王克义
何传锋
张超
吕洪礼
陈文尹
邢彪
彭小兵
姚大闯
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中铁四局集团有限公司
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Priority to CN201710245534.4A priority Critical patent/CN106988757A/en
Publication of CN106988757A publication Critical patent/CN106988757A/en

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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining 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
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining 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
    • E21D11/107Reinforcing elements therefor; Holders for the reinforcing elements
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D19/00Provisional protective covers for working space
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D20/00Setting anchoring-bolts
    • E21D20/02Setting anchoring-bolts with provisions for grouting
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/14Layout of tunnels or galleries; Constructional features of tunnels or galleries, not otherwise provided for, e.g. portals, day-light attenuation at tunnel openings

Abstract

The invention discloses a kind of double -side approach construction technology of reserved rock pillar and hanging by bolt combination, it is characterized in that:Staggered leading excavation supporting with the upper leave from office of single pilot tunnel point for top center pilot tunnel and upper side arch pilot tunnel, and temporary supporting system is set, form ledge;Lower side pilot tunnel is delayed to be excavated, and it is the reserved rock pillar in middle part to retain central region, and the top surface and side that rock pillar is reserved at middle part form the annular excavation face of section;Construction prestressed anchor is used as hanging fulcrum after each pilot drive is completed; then remove temporary supporting system; arch wall lining construction is carried out for the face for having excavated completion, rock pillar is reserved in the middle part of the protection down slope excavation of arch wall lining cutting, eventually forms large section secondary structure.The present invention shortens the engineering time on the premise of construction safety is ensured, reduces construction cost, and ensure construction quality.

Description

The double -side approach construction technology of reserved rock pillar and hanging by bolt combination

Technical field

It is especially severely-weathered to light weathered granite with II grade to IV grade the present invention relates to Super-large-section tunnel excavation technology For 350~380m of underground digging in subway station Super-large-section tunnel of main country rock2Excavation technology.

Background technology

In the digging process of subway station, in particular for the excavation of Super-large-section tunnel, there is larger potential safety hazard;With Expanding economy, in China, there is very big demand in big city for the construction of subway, and subway station is using extra-large cross-section or vertical The mode that body intersects is more universal.Construction speed, reduction construction cost and Du are being ensured for the excavation of Super-large-section tunnel Technical difficulty is all suffered from terms of in terms of exhausted potential safety hazard.Construction method of the prior art can not adapt to subway Requirement of the extra-large cross-section bored tunnel construction on security, construction speed and construction cost.

The content of the invention

The present invention is that there is provided a kind of reserved rock pillar and hanging by bolt combination to avoid the deficiency present in above-mentioned prior art Double -side approach construction technology, by middle part reserve rock pillar and top prestressed anchor hanging two kinds of technical measures carry out groups Close, implement double -side approach construction, with accelerating construction progress, reduce construction cost, prevent potential safety hazard.

The present invention adopts the following technical scheme that to solve technical problem:

The characteristics of reserved rock pillar of the present invention and the double -side approach construction technology of hanging by bolt combination is:For top center Pilot tunnel and upper side arch pilot tunnel are staggered leading excavation supporting with the upper leave from office of single pilot tunnel point, and set temporary supporting system, are formed Ledge;Lower side pilot tunnel is delayed to be excavated, and it is the reserved rock pillar in middle part to retain central region, and top surface and the side of rock pillar are reserved at middle part Side forms the annular excavation face of section;Construction prestressed anchor is then torn open paragraph by paragraph as hanging fulcrum after each pilot drive is completed Except temporary supporting system, arch wall lining construction is carried out to the face for having excavated completion, in the case where completing the protection of arch wall lining cutting of construction Slope excavates the reserved rock pillar in middle part, eventually forms large section secondary structure.

The characteristics of reserved rock pillar of the present invention and the double -side approach construction technology of hanging by bolt combination, lies also in:It is disconnected by excavating Face is divided into each region by following distribution:

Central region, is on the center of excavated section;

Top center pilot tunnel, positioned at the top of the central region, is in the vault center of excavated section;

Upper side encircles pilot tunnel, is to be located at the upper left-hand arch pilot tunnel on the left of the top center pilot tunnel respectively, and be located at The right upper right arch pilot tunnel then of the top center pilot tunnel, the upper side arch pilot tunnel and the common shape of top center pilot tunnel Arching cover area;

Lower side pilot tunnel, is to be located at the lower left side pilot tunnel below upper left-hand arch pilot tunnel respectively, and right positioned at top Pilot tunnel office is in the central region on the right side of pilot tunnel on the right side of bottom below the arch pilot tunnel of side, the lower left side pilot tunnel and bottom Both sides;

The construction technology is that each region following steps are excavated:

The first step:Stagger the upper left-hand arch pilot tunnel and upper right arch pilot tunnel for excavating office in both sides successively first, so Top center pilot tunnel is excavated afterwards, and encircleing pilot tunnel, upper right for upper left-hand encircles pilot tunnel and each single pilot tunnel of top center pilot tunnel Point upper leave from office is staggered excavations, interrelated between adjacent pilot tunnel, and sets temporary supporting system, formation ledge;

The temporary supporting system includes:

Between the top center pilot tunnel and upper side arch pilot tunnel, in be vertically arranged I22a I-steel as it is interim perpendicular every Wall, double steel bar mesh sheet is set in the both sides in the interim perpendicular next door, the longitudinally disposed perpendicular next door between each temporarily perpendicular next door Spacing between dowel, adjacent interim perpendicular next door is set to 0.5~0.75m, the construction lock pin anchor tube on the arch springing of both sides;Pin Closing is carried out to the interim perpendicular next door and double steel bar mesh sheet injection C25 concrete and forms the thick interim vertical walls of 35cm;

Encircle in the upper side between pilot tunnel and lower side pilot tunnel, interim tabula is used as in lateral arrangement I22a I-steel Wall, double steel bar mesh sheet, the longitudinally disposed cross wall between each interim cross wall are set in the both sides of the interim cross wall Spacing between dowel, adjacent interim cross wall is set to 0.5~0.75m;For the interim cross wall and clad steel Muscle mesh sheet injection C25 concrete carries out closing and forms the thick interim transverse plates of 35cm;

Second step:Stagger excavation office pilot tunnel on the right side of the lower left side pilot tunnel of both sides and bottom successively, retains middle region Domain is that rock pillar is reserved at middle part, and the top surface and side that rock pillar is reserved at middle part form the annular excavation face of section;

3rd step:Row's prestressing force hollow grouting anchor is respectively set in dome portions and the both sides of the position of joints in interim perpendicular next door Hanging is formed, temporary supporting system is then removed paragraph by paragraph, arch wall lining construction is carried out to the face for having excavated completion, construction is completed Arch wall lining cutting protection under excavate the reserved rock pillar in middle part;

4th step:Middle part reserve rock pillar excavate after the completion of, paragraph by paragraph construction bottom plate inverted arch, center pillar and in hardened structure, formed Large section secondary structure.

Compared with the prior art, the present invention has the beneficial effect that:

1st, the present invention reserves rock pillar and the double combination measures of top prestressed anchor hanging using middle part, is that double -side approach is applied Work technique;The arc Core Soil of two side-wall pilot tunnel in prior art is eliminated, the system of reserved bottom rock pillar is replaced with;Increase Excavation space, largely facilitates artificial and big machinery and operates, can integrally accelerate 15% construction speed;

2nd, present invention substantially reduces gib, simplify complicated procedures of forming;

3rd, the present invention substantially increases the safety of work progress using reserved rock pillar and the structure type of hanging by bolt combination Property.

Brief description of the drawings

Fig. 1 is excavation construction of the invention sequence schematic diagram step by step;

Fig. 2 is excavation construction of the invention sequence and arch wall structural representation step by step;

Fig. 3 serves as a contrast schematic diagram for the large section two of the present invention;

Label in figure:1 top center pilot tunnel, 2 upper left-hands arch pilot tunnel, 3 upper rights arch pilot tunnel, 4 lower left side pilot tunnels, Pilot tunnel on the right side of 5 bottoms, the reserved rock pillar in 6 middle parts, 7 arch wall lining cutting, 8 prestressing force hollow grouting anchors, 9 erect next door temporarily, and 10 is interim Cross wall, 11 lock pin anchor tubes, 12 vertical walls, 13 interim transverse plates, 14 bottom plate inverted arch, 15 center pillars, hardened structure in 16.Brief description of the drawings

The double -side approach construction technology that rock pillar and hanging by bolt combination are reserved referring to Fig. 1, in the present embodiment is to excavate Section is divided into each region by following distribution:

Central region, is on the center of excavated section;

Top center pilot tunnel 1, positioned at the top of central region, is in the vault center of excavated section;

Upper side encircles pilot tunnel, is the upper left-hand arch pilot tunnel 2 for being located at the left side of top center pilot tunnel 1 respectively, and positioned at top The right upper right arch pilot tunnel 3 then of portion center pilot tunnel 1, upper side arch pilot tunnel is collectively forming ledge region with top center pilot tunnel 1;

Lower side pilot tunnel, is to be located at the lower left side pilot tunnel 4 that upper left-hand encircles the lower section of pilot tunnel 2 respectively, and positioned at top The office of pilot tunnel 5 is the two of central region on the right side of pilot tunnel 5 on the right side of the bottom of the lower section of right side arch pilot tunnel 3, lower left side pilot tunnel 4 and bottom Side;

Construction technology is that each region following steps are excavated:

The first step:Stagger the upper left-hand arch pilot tunnel 2 and upper right arch pilot tunnel 3 for excavating office in both sides successively first, Then top center pilot tunnel 1 is excavated, encircleing pilot tunnel 2, upper right for upper left-hand encircles pilot tunnel 3 and each list of top center pilot tunnel 1 The upper leave from office of individual pilot tunnel point is staggered excavations, interrelated between adjacent pilot tunnel, and sets temporary supporting system, formation ledge;

Encircle pilot tunnel 2 for upper left-hand, include excavation, supporting and the temporary support of up/down steps, excavation height 8m, width 8.5m.Up/down steps excavation face distance controlling first performs before excavating in 3-5m and carries out During Initial Stage Construction after advance support, excavation in time Supporting and vertical horizontal temporary support;

Encircle pilot tunnel 3 for upper right, include excavation, supporting and the temporary support of up/down steps, left and right cavity parallel step Face distance controlling is in 15m.The parameters such as height, the drilling depth length of excavation and upper left-hand arch pilot tunnel 2 are consistent, after excavation and Shi Jinhang preliminary bracings and vertical horizontal temporary support.

For top center pilot tunnel 1, including excavate and supporting construction, excavation height 5.5m, the ginseng such as width 8m, drilling depth length Number is consistent with upper left-hand arch pilot tunnel 2, carries out preliminary bracing after excavation in time, makes its upper top center pilot tunnel 1, upper left-hand Encircle the preliminary bracing closing cyclization of pilot tunnel 2 and upper right arch pilot tunnel 3 totally three pilot tunnels, form ledge.

Temporary supporting system includes:

Between top center pilot tunnel and upper side arch pilot tunnel, next door 9 is erected in I22a I-steel is vertically arranged as interim, Double steel bar mesh sheet is set in the both sides in interim perpendicular next door 9, the longitudinally disposed perpendicular next door connection between each temporarily perpendicular next door 9 Spacing between muscle, adjacent interim perpendicular next door 9 is set to 0.5~0.75m, the construction lock pin anchor tube 11 on the arch springing of both sides;Pin Closing is carried out to interim perpendicular next door 9 and double steel bar mesh sheet injection C25 concrete and forms the thick interim vertical walls 12 of 35cm;

Encircle in upper side between pilot tunnel and lower side pilot tunnel, in lateral arrangement I22a I-steel as interim cross wall 10, Double steel bar mesh sheet is set in the both sides of interim cross wall 10, the longitudinally disposed cross wall connection between each interim cross wall 10 Spacing between muscle, adjacent interim cross wall 10 is set to 0.5~0.75m;For interim cross wall 10 and double layer bar Piece injection C25 concrete carries out closing and forms the thick interim transverse plates 13 of 35cm;

Temporary supporting system is by erecting next door 9, perpendicular next door dowel, interim cross wall 10, cross wall dowel, lock temporarily Closed between pin anchor tube 11, and double steel bar mesh sheet formation framework of steel reinforcement, framework of steel reinforcement using 35cm thickness C25 gunite concretes Laid entirely in interim vertical wall 12 and interim transverse plate 13, tunnel total length.

Second step:Stagger excavation office pilot tunnel 5 on the right side of the lower left side pilot tunnel 4 of both sides and bottom successively, retains middle part Region is that rock pillar 6 is reserved at middle part, and the top surface and side that rock pillar 6 is reserved at middle part form the annular excavation face of section, as shown in Figure 2;

For excavation and the supporting of lower left side pilot tunnel 4, including up/down steps.Excavation height in 8m or so, width 6.5m, The parameters such as drilling depth length are consistent with upper left-hand arch pilot tunnel 2, carry out preliminary bracing after excavation in time.

For pilot tunnel 5 on the right side of bottom, the excavation of up/down steps, supporting, the parallel step face distance controlling of left and right pilot tunnel In 15m.The parameters such as height, the drilling depth length of excavation are consistent with lower left side pilot tunnel 4, carry out preliminary bracing after excavation in time.

3rd step:The hollow slip casting anchor of row's prestressing force is respectively set in dome portions and the both sides of the position of joints in interim perpendicular next door 9 The formation hanging of bar 8, then removes temporary supporting system paragraph by paragraph, and removing length and secondary lining, to pour length identical, to having excavated The face of completion carries out arch wall lining cutting 7 and constructed, and rock pillar 6 is reserved in the middle part of excavation in the case where completing the protection of arch wall lining cutting 7 of construction;

4th step:Middle part is reserved after the completion of rock pillar 6 excavates, paragraph by paragraph construction bottom plate inverted arch 14, center pillar 15 and in hardened structure 16, form large section secondary structure as shown in Figure 3.

Claims (2)

1. a kind of reserved rock pillar and the double -side approach construction technology of hanging by bolt combination, it is characterized in that:Led for top center Hole and upper side arch pilot tunnel are staggered leading excavation supporting with the upper leave from office of single pilot tunnel point, and set temporary supporting system, form arch Lid;Lower side pilot tunnel is delayed to be excavated, and it is the reserved rock pillar in middle part to retain central region, and top surface and the side of rock pillar are reserved at middle part Form the annular excavation face of section;Construction prestressed anchor is then removed paragraph by paragraph as hanging fulcrum after each pilot drive is completed Temporary supporting system, carries out arch wall lining cutting (7) to the face for having excavated completion and constructs, in the guarantor for the arch wall lining cutting (7) for completing construction The lower slope of shield excavates the reserved rock pillar (6) in middle part, eventually forms large section secondary structure.
2. reserved rock pillar according to claim 1 and the double -side approach construction technology of hanging by bolt combination, it is characterized in that: Excavated section is divided into each region by following distribution:
Central region, is on the center of excavated section;
Top center pilot tunnel (1), positioned at the top of the central region, is in the vault center of excavated section;
Upper side encircles pilot tunnel, is to be located at the upper left-hand arch pilot tunnel (2) on the left of the top center pilot tunnel (1), Yi Jiwei respectively In the right upper right arch pilot tunnel (3) then of the top center pilot tunnel (1), the upper side arch pilot tunnel is led with the top center Hole (1) is collectively forming ledge region;
Lower side pilot tunnel, is to be located at the lower left side pilot tunnel (4) below upper left-hand arch pilot tunnel (2) respectively, and positioned at top Pilot tunnel (5) office exists on the right side of pilot tunnel (5) on the right side of bottom below right side arch pilot tunnel (3), the lower left side pilot tunnel (4) and bottom The both sides of the central region;
The construction technology is that each region following steps are excavated:
The first step:Stagger upper left-hand arch pilot tunnel (2) and upper right the arch pilot tunnel (3) for excavating office in both sides successively first, Then top center pilot tunnel (1) is excavated, encircleing pilot tunnel (2), upper right for upper left-hand encircles pilot tunnel (3) and top center pilot tunnel (1) the upper leave from office of each single pilot tunnel point is staggered excavations, interrelated between adjacent pilot tunnel, and sets temporary supporting system, is formed and encircleed Lid;
The temporary supporting system includes:
Between the top center pilot tunnel and upper side arch pilot tunnel, next door is erected in I22a I-steel is vertically arranged as interim (9) double steel bar mesh sheet, is set in the both sides of interim perpendicular next door (9), it is longitudinally disposed between each temporarily perpendicular next door (9) Spacing between perpendicular next door dowel, adjacent interim perpendicular next door (9) is set to 0.5~0.75m, lock of being constructed on the arch springing of both sides Pin anchor tube (11);Closing, which is carried out, for temporarily perpendicular next door (9) and double steel bar mesh sheet injection C25 concrete forms 35cm thickness Interim vertical wall (12);
Encircle in the upper side between pilot tunnel and lower side pilot tunnel, interim cross wall is used as in lateral arrangement I22a I-steel (10) double steel bar mesh sheet, is set in the both sides of the interim cross wall (10), along longitudinal direction between each interim cross wall (10) The spacing between cross wall dowel, adjacent interim cross wall (10) is set to be set to 0.5~0.75m;For described interim Cross wall (10) and double steel bar mesh sheet injection C25 concrete carry out closing and form the thick interim transverse plates (13) of 35cm;
Second step:Stagger excavation office pilot tunnel (5) on the right side of the lower left side pilot tunnel (4) of both sides and bottom successively, retains middle part Region is that rock pillar (6) is reserved at middle part, and the top surface and side that rock pillar (6) is reserved at middle part form the annular excavation face of section;
3rd step:Row's prestressing force hollow grouting anchor is respectively set in dome portions and the both sides of the position of joints of interim perpendicular next door (9) (8) hanging is formed, temporary supporting system is then removed paragraph by paragraph, carrying out arch wall lining cutting (7) to the face for having excavated completion constructs, complete The reserved rock pillar (6) in middle part is excavated under into the protection of the arch wall lining cutting (7) of construction;
4th step:Middle part reserve rock pillar (6) excavate after the completion of, paragraph by paragraph construction bottom plate inverted arch (14), center pillar (15) and in it is hardened Structure (16), forms large section secondary structure.
CN201710245534.4A 2017-04-14 2017-04-14 The double -side approach construction technology of reserved rock pillar and hanging by bolt combination CN106988757A (en)

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