CN110748355A - Tunnel portal construction method for large-section tunnel pilot tunnel - Google Patents

Tunnel portal construction method for large-section tunnel pilot tunnel Download PDF

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Publication number
CN110748355A
CN110748355A CN201911191362.2A CN201911191362A CN110748355A CN 110748355 A CN110748355 A CN 110748355A CN 201911191362 A CN201911191362 A CN 201911191362A CN 110748355 A CN110748355 A CN 110748355A
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CN
China
Prior art keywords
tunnel
pilot
cutting
portal
layer
Prior art date
Application number
CN201911191362.2A
Other languages
Chinese (zh)
Inventor
丁兴
文涛
李攀
秦晓升
谭佩林
邱伟
李斐斐
付林芳
李日升
窦天红
廖裕海
徐威
Original Assignee
中建四局土木工程有限公司
中国建筑第四工程局有限公司
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Application filed by 中建四局土木工程有限公司, 中国建筑第四工程局有限公司 filed Critical 中建四局土木工程有限公司
Priority to CN201911191362.2A priority Critical patent/CN110748355A/en
Publication of CN110748355A publication Critical patent/CN110748355A/en

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Classifications

    • 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
    • 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
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/10Making by using boring or cutting machines
    • E21D9/1066Making by using boring or cutting machines with fluid jets

Abstract

The invention discloses a tunnel portal construction method of a large-section tunnel pilot tunnel, which comprises the steps of dividing the large-section tunnel pilot tunnel into a plurality of pilot tunnels, determining a tunnel portal outline cutting position line of each pilot tunnel, and performing construction on the tunnel portal of each pilot tunnel on the upper layer according to a preset sequence and water drilling cutting according to the tunnel portal outline cutting position line; and after the construction of each pilot tunnel on the upper layer is finished, performing tunnel portal water drilling construction on each pilot tunnel on the lower layer according to a preset sequence to finish the pilot tunnel construction. According to the invention, the pilot tunnel portal construction is carried out by adopting the water drill cutting, so that on one hand, the disturbance to the surrounding foundation pit supporting structure is reduced, and meanwhile, the construction noise is reduced, the pilot tunnel construction speed is improved, and further, the whole tunnel construction progress is accelerated.

Description

Tunnel portal construction method for large-section tunnel pilot tunnel

Technical Field

The invention relates to the technical field of engineering construction, in particular to a tunnel portal construction method for a large-section tunnel pilot tunnel.

Background

In the process of constructing ramp engineering, pilot tunnel construction is common, and pilot tunnel portal breaking is needed during pilot tunnel construction. The method for breaking the tunnel portal commonly used at present is to directly break a tunnel portal support system by using a gun machine. However, when the blasting machine is used for directly breaking the tunnel portal support system, the defects of high noise, high vibration and slow construction progress exist, and meanwhile, the foundation pit support can be damaged when the blasting machine is used for directly breaking the tunnel portal support system.

Disclosure of Invention

The invention aims to solve the technical problem of providing a tunnel portal construction method of a large-section tunnel pilot tunnel aiming at the defects of the prior art.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a portal construction method of a large-section tunnel pilot tunnel comprises the following steps:

dividing the large-section tunnel pilot tunnel into a plurality of pilot tunnels, and determining a tunnel portal outline cutting position line of each pilot tunnel, wherein the pilot tunnels are arranged in an upper layer and a lower layer;

constructing the portal of each pilot tunnel on the upper layer according to a preset sequence by water drilling cutting according to the cutting position line of the portal outline;

and after the construction of each pilot tunnel on the upper layer is finished, performing tunnel portal water drilling construction on each pilot tunnel on the lower layer according to a preset sequence to finish the pilot tunnel construction.

The tunnel portal construction method of the large-section tunnel pilot tunnel comprises the following steps of constructing portal portals of all pilot tunnels on an upper layer according to a preset sequence and a cutting position line of the portal outlines through water drilling cutting, and comprises the following steps of:

and breaking the sprayed concrete in the upper layer pilot tunnel area formed by the pilot tunnels on the upper layer to determine the position of the column body at each pilot tunnel.

The tunnel portal construction method of the large-section tunnel pilot tunnel comprises the following steps of:

horizontally cutting an upper layer pilot hole area formed by the pilot holes on the upper layer according to a hole door contour cutting position line;

after the horizontal cutting is finished, vertically cutting the portal of each guide hole on the upper layer;

and after the vertical cutting is finished, laying down the pile bodies corresponding to the guide holes according to a preset sequence so as to realize the construction of the guide holes on the upper layer.

The tunnel portal construction method of the large-section tunnel pilot tunnel comprises the following steps of:

placing a water drill in a horizontal cutting line above the cutting position line of the portal outline of each pilot tunnel on the upper layer, and horizontally cutting a first row of drilled holes in the pilot tunnel area according to the horizontal direction, wherein the horizontal cutting line above the cutting position line of the portal outline of each pilot tunnel is positioned on the same straight line;

and after the first row of drilled holes are cut, horizontally cutting a second row of drilled holes in the pilot hole area in the horizontal direction until lower horizontal cutting lines in the portal outline cutting position lines of all the pilot holes on the upper layer are cut, wherein the lower horizontal cutting lines in the portal outline cutting position lines of all the pilot holes are positioned on the same straight line.

According to the tunnel portal construction method of the large-section tunnel pilot tunnel, the intervals between any two rows of drill holes in the horizontal direction are equal.

The tunnel portal construction method of the large-section tunnel pilot tunnel comprises the following steps that three pilot tunnels are arranged on an upper layer, and the three pilot tunnels are sequentially arranged side by side.

The tunnel portal construction method of the large-section tunnel pilot tunnel comprises the following steps of after vertical cutting is completed, laying down pile bodies corresponding to the pilot tunnels according to a preset sequence to realize construction of the pilot tunnels on the upper layer, wherein the construction method comprises the following steps:

after the vertical cutting is finished, the pile body corresponding to the first pilot tunnel in the three pilot tunnels which are arranged side by side is laid down;

after the pile body corresponding to the first pilot tunnel is laid down, the pile body corresponding to a third pilot tunnel in the three pilot tunnels which are arranged side by side is laid down;

and after the pile body corresponding to the third pilot tunnel is laid down, the pile body corresponding to the second pilot tunnel in the three pilot tunnels arranged side by side is laid down.

The tunnel portal construction method of the large-section tunnel pilot tunnel comprises the following steps of after vertical cutting is completed, laying down pile bodies corresponding to the pilot tunnels according to a preset sequence to realize construction of the pilot tunnels on the upper layer, wherein the construction method comprises the following steps:

and after the pile body corresponding to each pilot tunnel is laid down, respectively arranging a protective frame around the tunnel door of each pilot tunnel to support the pilot tunnel.

The tunnel portal construction method of the large-section tunnel pilot tunnel comprises the step of constructing the portal of each pilot tunnel on the lower layer in the same way as the portal of each pilot tunnel on the upper layer.

Has the advantages that: compared with the prior art, the invention provides a tunnel portal construction method of a large-section tunnel pilot tunnel, which comprises the steps of dividing the large-section tunnel pilot tunnel into a plurality of pilot tunnels, determining a portal profile cutting position line of each pilot tunnel, and performing construction on the portals of the upper-layer pilot tunnels according to a preset sequence and water drilling cutting according to the portal profile cutting position line; and after the construction of each pilot tunnel on the upper layer is finished, performing tunnel portal water drilling construction on each pilot tunnel on the lower layer according to a preset sequence to finish the pilot tunnel construction. According to the invention, the pilot tunnel portal construction is carried out by adopting the water drill cutting, so that on one hand, the disturbance to the surrounding foundation pit supporting structure is reduced, and meanwhile, the construction noise is reduced, the pilot tunnel construction speed is improved, and further, the whole tunnel construction progress is accelerated.

Drawings

FIG. 1 is a flow chart of a tunnel portal construction method of a large-section tunnel pilot tunnel provided by the invention.

FIG. 2 is a schematic diagram of pilot tunnel arrangement in the tunnel portal construction method of the large-section tunnel pilot tunnel provided by the invention.

FIG. 3 is a plan view of a broken outline of a tunnel portal in the method for constructing a tunnel portal of a large-section tunnel pilot tunnel according to the present invention.

FIG. 4 is a schematic diagram of the method for constructing the tunnel portal of the large-section tunnel pilot tunnel according to the invention, wherein the upper layer and the lower layer are drilled by water to break the tunnel portal.

Detailed Description

The invention provides a tunnel portal construction method of a large-section tunnel pilot tunnel, which is further described in detail below by referring to the attached drawings and embodiments in order to make the purpose, technical scheme and effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It should also be noted that the same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and the specific meaning of the terms may be understood by those skilled in the art according to specific circumstances.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The invention will be further explained by the description of the embodiments with reference to the drawings.

The invention provides a tunnel portal construction method of a large-section tunnel pilot tunnel, as shown in figure 1, the method comprises the following steps:

s10, dividing the large-section tunnel pilot tunnel into a plurality of pilot tunnels, and determining a tunnel portal outline cutting position line of each pilot tunnel, wherein the pilot tunnels are arranged in an upper layer and a lower layer;

s20, performing construction on the portal of each pilot tunnel on the upper layer according to a preset sequence and water drilling cutting according to the portal outline cutting position line;

and S30, after the construction of each pilot tunnel on the upper layer is finished, performing tunnel portal water drilling construction on each pilot tunnel on the lower layer according to a preset sequence to finish the pilot tunnel construction.

This embodiment is through dividing big section tunnel pilot hole into a plurality of pilot holes, later using the water to bore the cutting mode and carry out the pilot hole door and use, can reduce the disturbance to the peripheral excavation supporting construction of pilot hole like this, adopts water to bore the cutting technique simultaneously and can reduce the construction noise, reduces the influence of construction to surrounding environment. In addition, still have mechanical installation and dismantle advantages such as convenient, required operating space is little in the construction of water brill, and can abolish the system of strutting fast for the whole construction progress of tunnel.

Specifically, in step S10, the large cross-section tunnel pilot tunnel is a pilot tunnel to be constructed, and after the large cross-section tunnel pilot tunnel is determined, the large cross-section tunnel pilot tunnel is divided into a plurality of pilot tunnels, and the plurality of pilot tunnels are arranged in an upper layer and a lower layer. Wherein, the upper and lower two-layer is divided into two layers according to the vertical direction, and the pilot holes on the same layer are arranged in sequence according to the horizontal direction. In addition, in practical application, in order to improve the stability of the upper and lower layers of the pilot holes, the number of the pilot holes on the upper layer is equal to that of the pilot holes on the lower layer, and the pilot holes on the upper layer correspond to the pilot holes on the lower layer one to one. For example, as shown in fig. 2, the large cross-section tunnel pilot hole is divided into 6 pilot holes, which are respectively located above pilot hole a, above pilot hole b, above pilot hole c, below pilot hole a, below pilot hole b and below pilot hole c; the pilot holes a, the pilot holes b and the pilot holes c are sequentially arranged along the horizontal direction and are positioned on the same layer along the vertical direction; the lower part of the pilot hole a, the lower part of the pilot hole b and the lower part of the pilot hole c are sequentially arranged along the horizontal direction and are positioned on the same layer along the vertical direction. Of course, before the large-section tunnel is guided, a construction warning line needs to be arranged around the construction site in advance.

Further, after dividing the large-section tunnel pilot tunnel into a plurality of pilot tunnels, as shown in fig. 3, the portal outline cutting position lines of each pilot tunnel are respectively determined, and the portal outline cutting position lines of each pilot tunnel are marked, so that construction can be performed according to the portal outline cutting position lines of each pilot tunnel during construction, and the accuracy of breaking is improved. This is because if few breaks will affect the pilot tunnel support construction (e.g., insufficient installation space, unable to install unequal supports), and if over breaks there will be safety risks (e.g., too large a break span may cause the upper soil to collapse and the pile to settle).

Further, in the step S20, the preset sequence is preset, and the preset sequence is a hole door construction sequence for limiting each pilot hole located on the upper layer. That is, when constructing the tunnel doors of the respective pilot tunnels located on the upper floor, it is necessary to perform construction in the predetermined order. For example, as shown in fig. 2, the pilot holes on the upper layer include a pilot hole a, a pilot hole b and a pilot hole c, wherein the construction sequence of the pilot hole a, the pilot hole b and the pilot hole c is to construct the pilot hole a, then construct the pilot hole c and finally construct the pilot hole b, and then when constructing the pilot hole a, the pilot hole b and the pilot hole c, construction is required according to the sequence.

Further, in an implementation manner of this embodiment, the applying, according to a preset sequence, the hole gate of each guide hole on the upper layer according to the hole gate outline cutting position line includes:

horizontally cutting an upper layer pilot hole area formed by the pilot holes on the upper layer according to a hole door contour cutting position line;

after the horizontal cutting is finished, vertically cutting the portal of each guide hole on the upper layer;

and after the vertical cutting is finished, laying down the pile bodies corresponding to the guide holes according to a preset sequence so as to realize the construction of the guide holes on the upper layer.

Specifically, the via area is a communication area formed by each via located on the upper layer, and the via area includes each via located on the upper layer. The water drilling cutting is used for cutting the column piles in the area occupied by the upper-layer pilot tunnel area, so that before the tunnel portal of each pilot tunnel is constructed, the sprayed concrete in the area occupied by the large-section tunnel pilot tunnel needs to be broken, the position of the pile body at each pilot tunnel on the upper layer of the excavated section is found, and the water drilling cutting is conveniently carried out on the pile body in the area occupied by each pilot tunnel.

Further, in an implementation manner of this embodiment, the horizontally cutting the upper-layer pilot hole area formed by the pilot holes on the upper layer according to the hole gate outline cutting position line specifically includes:

placing a water drill in a horizontal cutting line above the cutting position line of the portal outline of each pilot tunnel on the upper layer, and horizontally cutting a first row of drilled holes in the pilot tunnel area according to the horizontal direction, wherein the horizontal cutting line above the cutting position line of the portal outline of each pilot tunnel is positioned on the same straight line;

and after the first row of drilled holes are cut, horizontally cutting a second row of drilled holes in the pilot hole area in the horizontal direction until lower horizontal cutting lines in the portal outline cutting position lines of all the pilot holes on the upper layer are cut, wherein the lower horizontal cutting lines in the portal outline cutting position lines of all the pilot holes are positioned on the same straight line.

Specifically, the upper horizontal cutting line is used for marking the upper edge position of the guide hole door, and the lower horizontal cutting line is used for marking the lower edge position of the guide hole door. Wherein, the upper horizontal cutting line of each guide hole is positioned on the same horizontal straight line, namely the upper edges of the guide hole doors are flush; the lower horizontal cutting lines of the guide holes are positioned on the same horizontal straight line, namely the lower edges of the guide hole doors are flush. In addition, before adopting the water to bore the cutting, need erect the water and bore, promptly after portal profile cutting position line, make the fixing bolt hole with the electric drill, with channel-section steel, riveting rod and bolt to the rig locking on a fender pile surface outside the portal line of cut, connect the water and bore the power, place the water brill drill bit in the inboard of cutting the portal line of cut to in the cutting of following portal profile cutting position line. In addition, the vertical cutting of the tunnel door of each pilot tunnel on the upper layer refers to that the pile is broken at the vertical excavation positions on two sides of each pilot tunnel by using a water drill.

Further, the distance between the upper horizontal cutting line and the lower horizontal cutting line is the height of the door of the guide hole, when horizontal cutting is carried out, multiple times of horizontal cutting can be carried out between the upper horizontal cutting line and the lower horizontal cutting line to form multiple rows of horizontal rows of holes, and the distance between any two adjacent rows of holes is equal. Wherein, every row of hole all includes a plurality of drilling, and a plurality of drilling are formed through the water drill cutting, and the distance between two arbitrary adjacent drilling in a plurality of drilling equals, can equally divide the pile body along the horizontal direction like this, improves the stability that the pile body was abolished. In addition, in a possible implementation manner of this embodiment, the rhinestone drill bit is a diamond drill bit with a diameter of 108mm, and the distance between two rows of adjacent rows of holes may be 620mm, so that the upper and lower sections of the pile body can be broken through the rhinestone drilling.

Further, in an implementation manner of this embodiment, the number of the pilot holes located in the upper layer pilot hole is three, and the three pilot holes are sequentially arranged side by side. Correspondingly, after vertical cutting is accomplished, lay down the pile body that each pilot tunnel corresponds according to predetermined order to the realization specifically includes to each pilot tunnel construction that is located the upper strata:

after the vertical cutting is finished, the pile body corresponding to the first pilot tunnel in the three pilot tunnels which are arranged side by side is laid down;

after the pile body corresponding to the first pilot tunnel is laid down, the pile body corresponding to a third pilot tunnel in the three pilot tunnels which are arranged side by side is laid down;

and after the pile body corresponding to the third pilot tunnel is laid down, the pile body corresponding to the second pilot tunnel in the three pilot tunnels arranged side by side is laid down.

Specifically, as shown in fig. 4, three pilot holes on the upper layer are respectively marked as a first pilot hole 1, a second pilot hole 3 and a third pilot hole 2, when a pile body corresponding to each pilot hole is laid down, the pile body in the first pilot hole 1 is laid down in a root-divided manner, a pile head is broken by an air pick manually and then is placed in a lifting frame, the pile head is lifted into a slag pit by a crane for storage, a steel frame is installed at the upper edge of a tunnel door of the first pilot hole 1, and a reinforcing mesh is fixed by a reinforcing anchor rod to a supporting surface to perform injection concrete sealing so as to form support and add. After the upper edge of the first pilot tunnel 1 is primarily supported, the pile body in the third pilot tunnel 2 is divided into roots to be laid down, the pile head is broken by an air pick manually and then is arranged in a hanging frame, the pile head is hung into a slag soil pool through a crane to be stored, a steel frame is arranged at the upper edge of a tunnel door of the third pilot tunnel 2, and a reinforcing steel bar anchor rod is adopted to fix a reinforcing mesh to a supporting surface to spray concrete for sealing so as to form supporting. The pile body in the second pilot tunnel 3 is put down in a root-divided mode, the pile head is broken by an air pick manually and then is placed into a hanging frame, the hanging frame is hung into a residue soil pool through a crane to be stored, a steel frame is installed at the upper edge of a tunnel door of the second pilot tunnel 3, and a reinforcing steel bar anchor rod is adopted to fix a reinforcing mesh to a supporting surface to spray concrete and seal the supporting surface so as to form supporting and adding. And finally, loading all the broken pile heads of the muck pool to transport the broken pile heads. Of course, it is worth to be explained that after the pile body corresponding to each pilot tunnel is completely laid down, a protective frame is respectively arranged around the tunnel door of each pilot tunnel to support the pilot tunnel.

Further, in this embodiment, the construction process of each pilot hole on the lower layer is the same as that of each pilot hole on the upper layer, and the number of pilot holes of each pilot hole on the lower layer is equal to that of the pilot holes on the upper layer, and the corresponding preset sequence of each pilot hole on the lower layer is the same as that of each pilot hole on the upper layer, for example, as shown in fig. 4, three pilot holes on the lower layer are respectively marked as a fourth pilot hole 4, a fifth pilot hole 6 and a sixth pilot hole 5, when pile placing is performed on the fourth pilot hole 4, the fifth pilot hole 6 and the sixth pilot hole 5, pile placing is performed on the fourth pilot hole 4 first, after pile placing is completed on the fourth pilot hole 4, pile placing is performed on the sixth pilot hole 5, and after pile placing is completed on the sixth pilot hole 5, pile placing is performed on the fifth pilot hole 6 finally. In addition, the construction process of each pilot tunnel on the lower layer is not described herein, and specific reference is made to the construction process of each pilot tunnel on the upper layer. Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (9)

1. A tunnel portal construction method of a large-section tunnel pilot tunnel is characterized by comprising the following steps:
dividing the large-section tunnel pilot tunnel into a plurality of pilot tunnels, and determining a tunnel portal outline cutting position line of each pilot tunnel, wherein the pilot tunnels are arranged in an upper layer and a lower layer;
constructing the portal of each pilot tunnel on the upper layer according to a preset sequence by water drilling cutting according to the cutting position line of the portal outline;
and after the construction of each pilot tunnel on the upper layer is finished, performing tunnel portal water drilling construction on each pilot tunnel on the lower layer according to a preset sequence to finish the pilot tunnel construction.
2. The tunnel portal construction method of the large-section tunnel pilot tunnel according to claim 1, wherein before the tunnel portal of each pilot tunnel on the upper layer is constructed by water drilling and cutting according to the cutting position line of the tunnel portal outline according to the preset sequence, the method comprises the following steps:
and breaking the sprayed concrete in the upper layer pilot tunnel area formed by the pilot tunnels on the upper layer to determine the position of the column body at each pilot tunnel.
3. The tunnel portal construction method of the large-section tunnel pilot tunnel according to claim 1 or 2, wherein the step of performing the tunnel portal construction of each pilot tunnel on the upper layer according to the preset sequence and the tunnel portal contour cutting position line comprises the steps of:
horizontally cutting an upper layer pilot hole area formed by the pilot holes on the upper layer according to a hole door contour cutting position line;
after the horizontal cutting is finished, vertically cutting the portal of each guide hole on the upper layer;
and after the vertical cutting is finished, laying down the pile bodies corresponding to the guide holes according to a preset sequence so as to realize the construction of the guide holes on the upper layer.
4. The tunnel portal construction method of the large-section tunnel pilot tunnel according to claim 3, wherein the step of horizontally cutting the upper layer pilot tunnel area formed by each pilot tunnel on the upper layer according to the tunnel portal contour cutting position line specifically comprises the following steps:
placing a water drill in a horizontal cutting line above the cutting position line of the portal outline of each pilot tunnel on the upper layer, and horizontally cutting a first row of drilled holes in the pilot tunnel area according to the horizontal direction, wherein the horizontal cutting line above the cutting position line of the portal outline of each pilot tunnel is positioned on the same straight line;
and after the first row of drilled holes are cut, horizontally cutting a second row of drilled holes in the pilot hole area in the horizontal direction until lower horizontal cutting lines in the portal outline cutting position lines of all the pilot holes on the upper layer are cut, wherein the lower horizontal cutting lines in the portal outline cutting position lines of all the pilot holes are positioned on the same straight line.
5. The method for constructing a portal of a large-section tunnel pilot tunnel according to claim 4, wherein the intervals between any two rows of the drill holes in the horizontal direction are equal.
6. The tunnel portal construction method of the large-section tunnel pilot tunnel according to claim 3, wherein the number of the pilot tunnels on the upper layer is three, and the three pilot tunnels are arranged side by side in sequence.
7. The tunnel portal construction method of the large-section tunnel pilot tunnel according to claim 6, wherein after the vertical cutting is completed, the pile body corresponding to each pilot tunnel is laid down according to a preset sequence, so as to realize the construction of each pilot tunnel on the upper layer, specifically comprising:
after the vertical cutting is finished, the pile body corresponding to the first pilot tunnel in the three pilot tunnels which are arranged side by side is laid down;
after the pile body corresponding to the first pilot tunnel is laid down, the pile body corresponding to a third pilot tunnel in the three pilot tunnels which are arranged side by side is laid down;
and after the pile body corresponding to the third pilot tunnel is laid down, the pile body corresponding to the second pilot tunnel in the three pilot tunnels arranged side by side is laid down.
8. The tunnel portal construction method of the large-section tunnel pilot tunnel according to claim 7, wherein after the vertical cutting is completed, the pile body corresponding to each pilot tunnel is laid down according to a preset sequence, so as to realize the construction of each pilot tunnel on the upper layer, specifically comprising:
and after the pile body corresponding to each pilot tunnel is laid down, respectively arranging a protective frame around the tunnel door of each pilot tunnel to support the pilot tunnel.
9. The method for constructing the portal of the pilot tunnel of the large-section tunnel according to any one of claims 1 to 8, wherein the portal construction process of each pilot tunnel located at the lower level is the same as the portal construction process of each pilot tunnel located at the upper level.
CN201911191362.2A 2019-11-28 2019-11-28 Tunnel portal construction method for large-section tunnel pilot tunnel CN110748355A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102720504A (en) * 2012-06-13 2012-10-10 北京市公路桥梁建设集团有限公司 Double-side-wall-pilot-hole subsection bench cut method construction method
CN108729924A (en) * 2018-05-18 2018-11-02 中车建设工程有限公司 A kind of urban hard rock tunnel mechanical excavation rapid constructing method
CN109026019A (en) * 2018-08-03 2018-12-18 中水电第十工程局(郑州)有限公司 The method that water mill bores non-blasting rock move hole excavation construction
CN109339057A (en) * 2018-11-23 2019-02-15 中铁二十局集团电气化工程有限公司 A kind of catenary mast foundation pit water drilling excavation construction method
CN109736825A (en) * 2018-12-24 2019-05-10 中铁三局集团有限公司 Super hard rock tunnel water drilling cooperates hydraulic splitting excavation construction method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102720504A (en) * 2012-06-13 2012-10-10 北京市公路桥梁建设集团有限公司 Double-side-wall-pilot-hole subsection bench cut method construction method
CN108729924A (en) * 2018-05-18 2018-11-02 中车建设工程有限公司 A kind of urban hard rock tunnel mechanical excavation rapid constructing method
CN109026019A (en) * 2018-08-03 2018-12-18 中水电第十工程局(郑州)有限公司 The method that water mill bores non-blasting rock move hole excavation construction
CN109339057A (en) * 2018-11-23 2019-02-15 中铁二十局集团电气化工程有限公司 A kind of catenary mast foundation pit water drilling excavation construction method
CN109736825A (en) * 2018-12-24 2019-05-10 中铁三局集团有限公司 Super hard rock tunnel water drilling cooperates hydraulic splitting excavation construction method

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