CN201560780U - Ultra-small clear distance tunnel rock pillar pre-stress opposite-pull anchor rod structure - Google Patents

Ultra-small clear distance tunnel rock pillar pre-stress opposite-pull anchor rod structure Download PDF

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Publication number
CN201560780U
CN201560780U CN2009202022137U CN200920202213U CN201560780U CN 201560780 U CN201560780 U CN 201560780U CN 2009202022137 U CN2009202022137 U CN 2009202022137U CN 200920202213 U CN200920202213 U CN 200920202213U CN 201560780 U CN201560780 U CN 201560780U
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CN
China
Prior art keywords
rock pillar
tunnel
prestressing force
small clear
anchor
Prior art date
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CN2009202022137U
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Chinese (zh)
Inventor
臧延伟
章立峰
吴向东
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中国水电顾问集团华东勘测设计研究院
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Priority to CN2009202022137U priority Critical patent/CN201560780U/en
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Publication of CN201560780U publication Critical patent/CN201560780U/en

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Abstract

The utility model relates to an ultra-small clear distance tunnel rock pillar pre-stress opposite-pull anchor rod structure, which aims to solve the technical problems of providing an ultra-small clear distance tunnel rock pillar pre-stress opposite-pull anchor structure which is convenient in implementation, obvious in effect and comparatively saved in investment and solves the problem of rock pillar reinforcing in an ultra-small clear distance tunnel. The technical scheme includes that the ultra-small clear distance tunnel rock pillar pre-stress opposite-pull anchor structure is provided with a bidirectional inlet and outlet tunnel and a middle rock pillar arranged between the two tunnels, and is characterized in that a group of pre-stress opposite-pull anchor rods transversely and oppositely penetrates into the middle rock pillar of an inlet section and an outlet section of the tunnel; and two ends of each opposite-pull anchor rod are fixed by backing plates and nuts. The ultra-small clear distance tunnel rock pillar pre-stress opposite-pull anchor rod structure is adaptable to water and electricity and municipal transportation engineering, and particularly to reinforcing engineering of the middle rock pillar of the ultra-small clear distance tunnel (clear distance <= 6m).

Description

Rock pillar prestressing force is to drawing anchor structure in a kind of extra small clear-distance tunnel

Technical field

The utility model relates in a kind of extra small clear-distance tunnel rock pillar prestressing force to drawing anchor structure.Be applicable to water power, municipal traffic engineering, the particularly extra small clear-distance tunnel (stabilization works of rock pillar in the middle of the clear spacing≤6m).

Background technology

The topographic and geologic condition of China is very complicated, and mountain terrain proportion is very big, because the restriction of conditions such as special geology and landform, this special tunnel structure pattern between common separation formula tunnel and multiple-arch tunnel of small-clear-distance tunnel is just arisen at the historic moment, and caused common concern with its unique advantage, brought huge economic and social benefit simultaneously.In the major urban arterial highway tunnel was built, construction scheme selected to be subjected to through regular meeting the restriction of various factors such as land used, removal, landform.Advancing the hole scheme even all can not meeting the demands of little clear distance proposed the theory of extra small clear-distance tunnel under this background.Compare separate tunnel, common small-clear-distance tunnel scheme, the big and risk of extra small clear-distance tunnel scheme construction technology complexity, difficulty of construction is difficult to control.The difficult point of extra small clear-distance tunnel construction mainly concentrates on the stablizing of middle rock pillar.Because of technical sophistication, difficulty of construction are big, domestic at this type of engineering proposed a lot of in the rock pillar Scheme of Strengthening, but less to the Study on Problems of construction key point and existence, referential data is limited.Yet the continuous development along with city tunnel is built is subjected to the restriction of wiring condition, and extra small clear-distance tunnel will become an important directions of building development from now on.Therefore, successfully grope one the cover extra small clear-distance tunnel in the rock pillar reinforcing technique seem very urgent.

Summary of the invention

The technical problems to be solved in the utility model is: provide a kind of enforcement convenient, effect is obvious, and rock pillar prestressing force has solved the problem that rock pillar is reinforced in the extra small clear-distance tunnel to drawing anchor structure in the extra small clear-distance tunnel that investment economizes.

The technical scheme that the utility model adopted is: rock pillar prestressing force is to drawing anchor structure in the described extra small clear-distance tunnel, have two-way into and out of the middle rock pillar between tunnel and two tunnels, it is characterized in that: laterally to wearing one group of prestressing force, described in the middle rock pillar of the inducer in tunnel and outlet section drawing the anchor pole two ends to fix by backing plate and nut to drawing anchor pole.

Prestressing force is the indented bars of diameter 25mm to drawing anchor pole, and is wrapped with topping around the body of rod of anchor pole.

In the general corrosion environment, the topping around the body of rod should adopt cement paste or cement mortar, and its thickness is 2.0cm.

In the heavy corrosion environment, topping is the epoxy resin cement paste of filling in the line pipe overcoat of body of rod overcoat in the anchoring section and the pipe orifice crack, and the thickness of filling slurry is not less than 1.0cm.

Described prestressing force leaves long outer the appearing of 25cm to the two ends of drawing anchor pole, scribbles bituminous material on appearing outward and adopts the concrete sealing.

This programme tunnel excavation of going ahead of the rest puts in place, and a prestressed anchor end anchoring is earlier treated that back row tunnel excavation puts in place to apply prestressing force again, and this operation makes that the later stage plays drawing the anchor pole effect to drawing anchor pole to play the system anchor bolt effect in advance.

The beneficial effects of the utility model are: this prestressing force adopts anchor pole to match with backing plate to drawing anchor structure, and is furnished with corrosion protective covering, can effectively play the double action of rock pillar and stable tunnel preliminary bracing side wall in the reinforcing; And this kind is convenient to drawing the anchor member field conduct, and effect is obvious, and investment economizes, can extensive use in the rock pillar reinforcing in similar extra small clear-distance tunnel.

Description of drawings

Fig. 1 is a front view of the present utility model.

Fig. 2 is the B-B sectional view of Fig. 1.

Fig. 3 is the enlarged drawing of Fig. 1 at the A place.

Fig. 4 is the front view of backing plate in the utility model.

The specific embodiment

Embodiment one:

This example is embodiment of the present utility model in the general corrosion environment, as Fig. 1, shown in Figure 3, present embodiment has two-way into and out of the middle rock pillar 1 between tunnel 3 and two tunnels, in the middle rock pillar 1 of tunnel entrance section and outlet section laterally to the indented bars prestressing force that is installed with one group of diameter 25mm to drawing anchor pole 2, this organizes drawing the arrangement of anchor pole in middle rock pillar as shown in Figure 2; Each prestressing force is fixing by backing plate 4 and nut 5 to the two ends of drawing anchor pole 2, and long outer the appearing of 25cm left at two ends, scribbles bituminous material on appearing outward and adopts the concrete sealing, and the structure of backing plate 4 as shown in Figure 4; Around drawing anchor pole 2, be wrapped with the thick cement mortar corrosion protective covering 2-1 of 2cm at each prestressing force.

The work progress of present embodiment is: the constructor adopts grouting with small pipe to reinforce to the middle rock pillar 1 (middle rock mass) in tunnel earlier; excavation is the tunnel in advance; boring is buried Φ 25mm indented bars prestressing force underground to drawing anchor pole 2 on middle rock pillar 1; after set up i-beam frame; by backing plate 4 (A3 steel) and nut 5 end of anchor pole is fixed; spray ready cement mortar then in the slit between the hole and the body of rod as corrosion protective covering 2-1, its thickness is 2cm.After treating that tunnel excavation supporting in advance reaches footpath, 5 times of holes, row tunnel, excavation back adopts the other end of backing plate 4 and nut 5 fixing anchor bars, and utilizes backing plate that rock pillar is tightened, and applies the prestressing force of 30-50kN.Appear to make things convenient for anchor pole stretch-draw to drawing the anchor pole two ends should reserve the outer of 25cm length, expose anchor pole part pitch material and adopt the concrete sealing.

Embodiment two:

This example is an embodiment of the present utility model in the heavy corrosion environment.As Fig. 1-shown in Figure 4; the basic structure of present embodiment and job practices and embodiment one are similar; material and structure that difference only is corrosion protective covering and is adopted change to some extent; be that every prestressing force is with line pipe overcoat to drawing anchor pole 2 outside the body of rod of anchoring section; and packing ring epoxy resins cement paste is as corrosion protective covering 2-1 in the pipe orifice crack, and the thickness of filling slurry is 1.0cm.

By embodiment one and embodiment two as can be seen: in different tunnel environments, adopt no material as corrosion protective covering; guaranteed steadiness and the working life of prestressing force described in the utility model to drawing anchor structure; the design feature of itself in addition; reinforced the intensity of rock pillar in the tunnel greatly, the safety that has improved the tunnel.

Claims (6)

  1. In the extra small clear-distance tunnel rock pillar prestressing force to drawing anchor structure, has two-way middle rock pillar (1) between tunnel (3) and two tunnels, it is characterized in that: in the middle rock pillar (1) of the inducer in tunnel and outlet section,, described the two ends of drawing anchor pole are fixed by backing plate (4) and nut (5) laterally to wearing one group of prestressing force to drawing anchor pole (2).
  2. 2. rock pillar prestressing force is characterized in that drawing anchor structure in the extra small clear-distance tunnel according to claim 1: described prestressing force is the indented bars of diameter 25mm to drawing anchor pole (2).
  3. 3. rock pillar prestressing force is characterized in that drawing anchor structure in the extra small clear-distance tunnel according to claim 1: described prestressing force to draw anchor pole (2) body of rod around be wrapped with topping (2-1).
  4. 4. rock pillar prestressing force is characterized in that drawing anchor structure in the extra small clear-distance tunnel according to claim 3: described topping (2-1) is cement paste or cement mortar, and the thickness of topping is 2.0cm.
  5. 5. rock pillar prestressing force is to drawing anchor structure in the extra small clear-distance tunnel according to claim 3; it is characterized in that: described topping (2-1) is the epoxy resin cement paste of filling in the line pipe overcoat of body of rod overcoat in the anchoring section and the pipe orifice crack, and the thickness of filling slurry is not less than 1.0cm.
  6. 6. rock pillar prestressing force is characterized in that drawing anchor structure in the extra small clear-distance tunnel according to claim 1 and 2: described prestressing force leaves long outer the appearing of 25cm to the two ends of drawing anchor pole (2), scribbles bituminous material on appearing outward and adopts the concrete sealing.
CN2009202022137U 2009-12-09 2009-12-09 Ultra-small clear distance tunnel rock pillar pre-stress opposite-pull anchor rod structure CN201560780U (en)

Priority Applications (1)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102966360A (en) * 2012-11-26 2013-03-13 中铁四局集团第二工程有限公司 Method for reinforcing rock walls in neighborhood tunnel
CN104153800A (en) * 2014-08-14 2014-11-19 中铁第一勘察设计院集团有限公司 Complex geological small-clear-distance parallel tunnel cross anchor rod reinforcing system and construction method thereof
CN105604576A (en) * 2016-01-20 2016-05-25 中铁隆工程集团有限公司 Soft rock stratum underground excavation large-section tunnel construction method and supporting system
CN105804776A (en) * 2016-03-15 2016-07-27 山东科技大学 Opposite pulling type anchor rods for gob-side entrydriving small coal pillar and support method thereof
CN106050243A (en) * 2016-07-28 2016-10-26 中冶建工集团有限公司 Super-shallow-buried small-spacing large-section multi-tunnel concurrent construction method
CN109356592A (en) * 2018-09-30 2019-02-19 中国建筑第八工程局有限公司 The construction method in small interval lamination tunnel
CN110130925A (en) * 2019-05-17 2019-08-16 深圳市综合交通设计研究院有限公司 The composite reinforcing method of rock pillar in a kind of small interval city tunnel
CN110307002A (en) * 2019-05-09 2019-10-08 深圳市综合交通设计研究院有限公司 The extra small clear-distance tunnel of a kind of II, III level country rock refines construction method

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102966360A (en) * 2012-11-26 2013-03-13 中铁四局集团第二工程有限公司 Method for reinforcing rock walls in neighborhood tunnel
CN104153800A (en) * 2014-08-14 2014-11-19 中铁第一勘察设计院集团有限公司 Complex geological small-clear-distance parallel tunnel cross anchor rod reinforcing system and construction method thereof
CN104153800B (en) * 2014-08-14 2016-04-27 中铁第一勘察设计院集团有限公司 Complicated geological small interval parallel tunnels Counter-pulled bolts reinforcement system and construction method thereof
CN105604576A (en) * 2016-01-20 2016-05-25 中铁隆工程集团有限公司 Soft rock stratum underground excavation large-section tunnel construction method and supporting system
CN105604576B (en) * 2016-01-20 2018-08-21 中铁隆工程集团有限公司 A kind of soft rock strata tunneling large-section tunnel construction method
CN105804776A (en) * 2016-03-15 2016-07-27 山东科技大学 Opposite pulling type anchor rods for gob-side entrydriving small coal pillar and support method thereof
CN105804776B (en) * 2016-03-15 2017-11-10 山东科技大学 For gob side entry driving fender to pull-type anchor pole and its method for protecting support
CN106050243A (en) * 2016-07-28 2016-10-26 中冶建工集团有限公司 Super-shallow-buried small-spacing large-section multi-tunnel concurrent construction method
CN109356592A (en) * 2018-09-30 2019-02-19 中国建筑第八工程局有限公司 The construction method in small interval lamination tunnel
CN109356592B (en) * 2018-09-30 2020-03-20 中国建筑第八工程局有限公司 Construction method of small-clear-distance laminated tunnel
CN110307002A (en) * 2019-05-09 2019-10-08 深圳市综合交通设计研究院有限公司 The extra small clear-distance tunnel of a kind of II, III level country rock refines construction method
CN110307002B (en) * 2019-05-09 2020-07-31 深圳市综合交通设计研究院有限公司 Refined construction method for II-grade and III-grade surrounding rock ultra-small clear distance tunnel
CN110130925A (en) * 2019-05-17 2019-08-16 深圳市综合交通设计研究院有限公司 The composite reinforcing method of rock pillar in a kind of small interval city tunnel

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Granted publication date: 20100825

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