CN217327330U

CN217327330U - Prefabricated mid-board mounting structure of single-hole double-line U-shaped section tunnel

Info

Publication number: CN217327330U
Application number: CN202220138079.4U
Authority: CN
Inventors: 张文龙; 周萌; 赵旭伟; 冯宝才; 李健; 赵志国; 姚泽; 田力达; 庞乐
Original assignee: China Railway Shanghai Design Institute Group Co Ltd
Current assignee: China Railway Shanghai Design Institute Group Co Ltd
Priority date: 2022-01-19
Filing date: 2022-01-19
Publication date: 2022-08-30
Anticipated expiration: 2032-01-19

Abstract

The utility model relates to the technical field of tunnel construction, in particular to a prefabricated intermediate wall mounting structure of a single-hole double-line U-shaped section tunnel, wherein the intermediate wall is composed of prefabricated intermediate wall segments which are prefabricated along the height direction in sections, the prefabricated intermediate wall segments are detachably connected and fixed, the prefabricated intermediate wall segments positioned at the upper part are detachably connected and fixed with a tunnel vault, and the prefabricated intermediate wall segments positioned at the lower part are detachably connected and fixed with a tunnel inverted arch; the intermediate walls are arranged in a width-wise manner along the longitudinal direction of the tunnel. The utility model has the advantages that: the construction efficiency is improved, the construction environment is improved, and a large amount of labor cost is saved; the method is suitable for the characteristic of narrow construction space in the horseshoe-shaped tunnel; the tunnel is completely separated from the up-line and the down-line, pore filling is not needed, the requirement of tunnel fire prevention evacuation is met, and extra pore filling measures are not needed, so that the tunnel fire prevention evacuation device is economical and rapid.

Description

Prefabricated mid-board mounting structure of single-hole double-line U-shaped section tunnel

Technical Field

The utility model belongs to the technical field of the tunnel construction technique and specifically relates to a prefabricated mid-board mounting structure in single-hole double-track horseshoe-shaped section tunnel.

Background

The urban rail transit builds single-hole double-line U-shaped tunnel and sets up mid-board, and this mid-board divides the inside in U-shaped tunnel into upper and lower line. When a fire disaster occurs, the up and down lines in the tunnel region are mutually evacuation rescue channels, and the ventilation and smoke discharge of one line do not influence the evacuation personnel of the other line.

At present, a single-hole double-line horseshoe-shaped tunnel intermediate wall generally adopts a cast-in-place structural form, and in order to prevent adverse stress concentration influence on a secondary lining and the intermediate wall caused by tunnel settlement, the top of the intermediate wall generally adopts a cantilever type structure. However, the cast-in-place cantilever middle partition wall structure has the following disadvantages:

1) the repeated wind pressure load generated by the train in the running process acts on the cantilever partition wall, so that the fatigue instability and damage of the wall are easily caused;

2) a gap is formed between the cast-in-place intermediate wall and the tunnel arch crown, two driving sections cannot be completely isolated, rock wool is adopted for filling in the later period, the working procedures are complicated and slow, and the working efficiency is extremely poor;

3) the intermediate wall is constructed in a cast-in-place mode, the space of a tunnel is narrow, and templates are difficult to erect and steel bars are difficult to bind;

4) the cast-in-place mid-partition is difficult to vibrate, and the quality of concrete pouring and connection with a lower structure cannot be guaranteed;

5) when installing whole prefabricated mid-board in the tunnel, operating space is restricted, can't install, needs to make partial cast-in-place section afterwards, and the construction procedure is numerous and diverse.

Disclosure of Invention

The utility model aims at providing a prefabricated mid-board mounting structure of single-hole double-line horseshoe-shaped section tunnel according to above-mentioned prior art, it is prefabricated with the framing through the mid-board to in the tunnel to cooperate the connected mode between mid-board and the tunnel structure, realize the prefabricated installation of mid-board.

The utility model discloses the purpose is realized accomplishing by following technical scheme:

the utility model provides a prefabricated mid-board mounting structure of single hole double-track horseshoe-shaped section tunnel, includes the mid-board of setting in the tunnel, its characterized in that: the intermediate wall is composed of prefabricated intermediate wall sections prefabricated in sections along the height direction, the prefabricated intermediate wall sections are detachably connected and fixed, the prefabricated intermediate wall section positioned at the upper part is detachably connected and fixed with the arch top of the tunnel, and the prefabricated intermediate wall section positioned at the lower part is detachably connected and fixed with the inverted arch of the tunnel; the intermediate walls are arranged in a width-wise manner along the longitudinal direction of the tunnel.

And tenons are arranged between the adjacent prefabricated intermediate wall segments, and penetrating bolts are arranged at the tenons and used for connecting and fixing the adjacent prefabricated intermediate wall segments.

The groove depth of the tenon and the mortise is 0.5 times of the width of the intermediate wall.

The tunnel vault is internally embedded with a sleeve, the sleeve is connected with a channel steel, and the prefabricated intermediate wall section located at the upper part is arranged in a groove body of the channel steel and is fixedly connected with the channel steel through a bolt.

The sleeve is vertically arranged at even intervals along the tunnel, the single intermediate wall is correspondingly provided with at least two sleeves, and the length of the channel steel is matched with that of the single intermediate wall.

The bottom that is located the lower part prefabricated segmental section of intermediate wall is provided with the bottom support pre-buried anchor bolt in the tunnel invert, the anchor bolt with the bottom support is connected fixedly.

The upper and lower both sides of rag crab-bolt are provided with the steel sheet respectively, the steel sheet is buried underground within the tunnel invert, both sides connect fixedly through the connecting reinforcement between the steel sheet and constitute wholly.

The height of the intermediate wall composed of the prefabricated intermediate wall segments is less than the clearance height of the tunnel.

The utility model has the advantages that:

1) the defects that the template erection and the steel bar binding are difficult and the concrete pouring and the connection quality with the lower structure cannot be ensured when the intermediate wall is constructed in a cast-in-place mode are overcome through the prefabrication mode of the intermediate wall;

2) the prefabricated intermediate wall and the mechanical installation are adopted in the horseshoe-shaped tunnel, so that the construction efficiency is improved, the construction environment is improved, and a large amount of labor cost is saved;

3) the prefabricated intermediate wall is divided into an upper section and a lower section and is connected with the tunnel lining through bolts, so that the characteristic of narrow construction space in the horseshoe-shaped tunnel is well adapted;

4) after the mid-board installation finishes, separate tunnel downlink from the top, need not to carry out the hole and stuff, both satisfied the sparse requirement of tunnel fire prevention, do not need extra mending the hole measure again, both economy is again quick.

Drawings

Fig. 1 is a schematic view of the overall installation structure of the present invention;

FIG. 2 is an enlarged schematic view of portion A of FIG. 1;

FIG. 3 is a schematic structural view of the middle and upper partition wall of the present invention;

FIG. 4 is a schematic structural view of the middle and lower partition wall of the present invention;

FIG. 5 is an enlarged schematic view of detail B of FIG. 1;

fig. 6 is an enlarged schematic view of a portion C in fig. 1.

Detailed Description

The features of the present invention and other related features are described in further detail below by way of example in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

as shown in fig. 1-6, the labels 1-14 are respectively shown as: the tunnel comprises an upper intermediate wall 1, a lower intermediate wall 2, a sleeve 3, channel steel 4, connecting steel bars 5, bolt holes 6, bolts 7, tenons and tongues 8, anchor bolts 9, steel plates 10, plastic sleeves 11, anchor bolt holes 12, a tunnel arch 13 and a tunnel inverted arch 14.

Example (b): as shown in fig. 1, the prefabricated intermediate wall installation structure for a single-hole double-track horseshoe-shaped cross-section tunnel in this embodiment includes intermediate walls provided in the tunnel, the intermediate walls being arranged in a widthwise manner in the longitudinal direction of the tunnel. Each intermediate wall is a double-section type prefabricated intermediate wall which is prefabricated in sections along the height direction, and the wall body of each intermediate wall is divided into an upper intermediate wall 1 and a lower intermediate wall 2. Wherein, upper portion mid-board 1 constitutes detachable connection with the tunnel vault and fixes, and lower part mid-board communicates detachable connection with the tunnel invert and fixes, and detachable the fixing between upper portion mid-board 1 and lower part mid-board 2.

Specifically, as shown in fig. 2 and 3, a bolt hole 6 is reserved in the top of the upper partition wall 1. When a secondary lining of the tunnel vault 13 is poured, a sleeve 3 is buried, the sleeve 3 is connected with a channel steel 4 through a bolt, and the shape and the width of the channel steel 4 are matched with those of the upper intermediate wall 1. The channel steel 4 is provided with a mounting hole matched with a bolt hole 6 reserved at the top of the upper intermediate wall 1; the top of the upper intermediate wall 1 can be placed in the groove body of the channel steel 4 and is fixedly connected with the channel steel 4 through bolts 7 penetrating through the bolt holes 6, so that the upper intermediate wall 1 is fixedly connected with the tunnel vault 13.

In this embodiment, when the secondary lining of the vault is poured, the sleeves 3 are embedded at even intervals along the longitudinal direction of the tunnel, so that two sleeves 3 are correspondingly arranged on each intermediate wall, and each intermediate wall can be stably and fixedly installed in the channel steel 4 connected with the two sleeves 3. The length of the channel steel 4 is matched with that of the single intermediate wall. Two bolt holes 6 corresponding to the positions of the two sleeves 3 are reserved on the top of the upper partition wall 1, and two corresponding mounting holes are also formed in the channel steel 4.

As shown in fig. 3, 4 and 5, the bottom of the upper intermediate wall 1 is provided with a tenon, the top of the lower intermediate wall 2 is provided with a groove matched with the tenon, and the upper intermediate wall 1 and the lower intermediate wall 2 form a limit fit through the formed tenon and tenon 8. Bolt holes 6 are reserved at positions corresponding to the tenons and the tenons 8 at the bottom of the upper intermediate wall 1 and the top of the lower intermediate wall 2, respectively, and the upper intermediate wall 1 and the lower intermediate wall 2 are fixedly connected by arranging through bolts 7 in the bolt holes 6.

In this embodiment, unsmooth falcon 8's shape is "V" font, makes things convenient for the installation of upper portion intermediate wall 1, and tongue and groove depth h =0.5b, and h is the tongue and groove depth in the formula, and b is the intermediate wall width to guarantee the structural strength and the wholeness of hookup location department between upper portion intermediate wall 1 and lower part intermediate wall 2.

As shown in fig. 4 and 6, the lower intermediate wall 2 is provided with a bottom support having a plurality of anchor holes 12 reserved therein. When the tunnel invert 14 is poured with the secondary lining, the anchor bolts 9 are embedded in the tunnel invert 14, and the anchor bolts 9 can be fixedly connected with the anchor bolt holes 12, so that the fixed connection between the lower middle partition wall 2 and the tunnel invert 14 is realized.

In the embodiment, two steel plates 10 are respectively arranged at the upper side and the lower side of a foundation bolt 9, the two steel plates 10 are respectively embedded in an inverted arch 14 of a tunnel, and the two steel plates 10 are connected and fixed into a whole by a connecting steel bar 5; through setting up two steel sheets 10, can effectively improve the anchoring ability of rag crab-bolt 9, and then guarantee joint strength and wholeness between lower part mid-board 2 and the tunnel invert 14.

The total height of the prefabricated intermediate wall composed of the upper intermediate wall 1 and the lower intermediate wall 2 is H1+ H2= H-10mm, where H1 is the height of the upper intermediate wall 1, H2 is the height of the lower intermediate wall 2, H is the clearance height of the tunnel, and 10 is the reserved height (mm) of the prefabricated wall top and the vault of the tunnel.

The installation of the embodiment comprises the following installation processes:

hanging rings are pre-buried in the middle positions of the upper middle partition wall 1 and the lower middle partition wall 2, the two middle partition walls are transported into the tunnel, and the lower middle partition wall 2 is installed on a foundation anchor bolt 9 buried in an inverted arch 14 of the tunnel through a grabbing and lifting machine and is fixed and compacted; fixing a section of channel steel 4 on a sleeve 3 pre-embedded in a tunnel vault 13 through a bolt 7, and then longitudinally pushing a wall body of the upper intermediate wall 1 into a clamping groove formed by the channel steel 4 and a groove formed in the top of the lower intermediate wall 2 along the tunnel; after the upper intermediate wall 1 is pushed in place, the top of the upper intermediate wall 1 is fixedly connected with the channel steel 4 by using the bolts 7, and the bottom of the upper intermediate wall 1 is fixedly connected with the lower intermediate wall 2.

In the embodiment, in specific implementation: the diameter of sleeve 3 is 36mm, and length 0.5m, the material is stainless steel 316L, and the tangent line of sleeve 3 and the cambered surface of tunnel vault 13 should keep perpendicular, and the gradient is less than or equal to 1.5, before pouring the vault concrete, should seal sleeve 3 through the sealed plug screw of installation, avoids the concrete to get into sleeve 3 and causes the jam, takes off sealed plug screw before installation channel-section steel 4.

The diameter of the bolt hole 6 reserved on the upper intermediate wall 1 and the lower intermediate wall 2 is slightly larger than that of the bolt 7, generally 6mm larger, and a plastic sleeve 11 is arranged on the inner side of the bolt hole 6, and the wall thickness of the plastic sleeve 11 is 3 mm.

The anchor bolt 9 is M42 in size. The thickness of steel sheet 10 is 10mm, adopts four diameter 32 mm's connecting reinforcement 5 to fix between upper and lower both sides steel sheet 10.

The surfaces of the anchor bolts 9, the sleeve 11, the channel steel 4, the bolts 7, the steel plate 10 and other steel members can be galvanized and anticorrosive, and the thickness is 8 microns. Wherein, the exposed part of the anchor bolt 9 is oiled after the construction is finished.

Although the conception and the embodiments of the present invention have been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims, and therefore, the description thereof is not repeated herein.

Claims

1. The utility model provides a prefabricated mid-board mounting structure of single hole double-track horseshoe-shaped section tunnel, includes the mid-board of setting in the tunnel, its characterized in that: the middle partition wall is composed of prefabricated middle partition wall sections prefabricated in sections along the height direction, the prefabricated middle partition wall sections are detachably connected and fixed, the prefabricated middle partition wall section positioned at the upper part is detachably connected and fixed with the arch top of the tunnel, and the prefabricated middle partition wall section positioned at the lower part is detachably connected and fixed with the inverted arch of the tunnel; the intermediate walls are arranged in a width-wise manner along the longitudinal direction of the tunnel.

2. The prefabricated mid-board mounting structure of single-hole double-line horseshoe-shaped section tunnel according to claim 1, characterized in that: and tenons are arranged between the adjacent prefabricated intermediate wall segments, and penetrating bolts are arranged at the tenons and used for connecting and fixing the adjacent prefabricated intermediate wall segments.

3. The prefabricated intermediate wall installation structure of the single-hole double-line horseshoe-shaped section tunnel according to claim 2, wherein: the groove depth of the tenon and the mortise is 0.5 times of the width of the intermediate wall.

4. The prefabricated mid-board mounting structure of single-hole double-line horseshoe-shaped section tunnel according to claim 1, characterized in that: the tunnel vault is internally embedded with a sleeve, the sleeve is connected with a channel steel, and the prefabricated intermediate wall section located at the upper part is arranged in a groove body of the channel steel and is fixedly connected with the channel steel through a bolt.

5. The prefabricated mid-board mounting structure of single-hole double-line horseshoe-shaped section tunnel according to claim 4, characterized in that: the sleeve is evenly arranged along the longitudinal direction of the tunnel at intervals, the single intermediate wall is correspondingly provided with at least two sleeves, and the length of the channel steel is matched with that of the single intermediate wall.

6. The prefabricated intermediate wall installation structure of a single-hole double-line horseshoe-shaped section tunnel according to claim 1, characterized in that: the bottom that is located the lower part prefabricated segmental section of intermediate wall is provided with the bottom support pre-buried anchor bolt in the tunnel invert, the anchor bolt with the bottom support is connected fixedly.

7. The prefabricated mid-board mounting structure of single-hole double-line horseshoe-shaped section tunnel according to claim 6, characterized in that: the upper and lower both sides of rag crab-bolt are provided with the steel sheet respectively, the steel sheet is buried underground within the tunnel invert, both sides connect fixedly through the connecting reinforcement between the steel sheet and constitute wholly.

8. The prefabricated intermediate wall installation structure of a single-hole double-line horseshoe-shaped section tunnel according to claim 1, characterized in that: the height of the intermediate wall composed of the prefabricated intermediate wall segments is less than the clearance height of the tunnel.