CN107701201A - A kind of duct pieces of shield tunnel sealing gasket - Google Patents

Abstract

The invention relates to the field of tunnel engineering, in particular to a shield tunnel segment gasket, which includes a gasket body, and the bottom of the gasket body is provided with an engaging structure matching the segment sealing groove. In the present invention, an occlusal structure suitable for the segment sealing groove is provided at the bottom of the gasket body, and the occlusal structure can occlude the gasket and the segment sealing groove, thereby enhancing the bond between the gasket and the segment sealing groove. The anti-sliding and anti-extrusion ability between the shield tunnel can avoid the sliding and extrusion of the gasket during the assembly process of the shield tunnel capping block, improve the assembly quality of the segment and the waterproof performance of the seam, and the waterproof effect of the gasket on the seam of the segment Better, and the manufacturing cost is low.

Description

A shield tunnel segment gasket

technical field

The invention relates to the field of tunnel engineering, in particular to a shield tunnel segment gasket.

Background technique

The shield tunnel construction method refers to the use of a shield machine to control the excavation surface and the surrounding soil from collapse and instability while carrying out tunnel excavation and slag removal, and assembling segments in the machine to form a lining and implement grouting behind the wall , so that the method of building tunnels without disturbing the surrounding soil is widely used in tunnel projects such as urban rail transit, highways, and water conservancy because of its safety, environmental protection, high degree of mechanization, generally no need to interrupt traffic, and not affected by weather conditions. .

At present, shield tunnels are mostly ring-shaped structures assembled by prefabricated reinforced concrete segments and supplemented by bolt connections. The joints between blocks are waterproofed through gaskets. Each ring segment is generally composed of a capping block, two adjacent blocks, and three standard blocks. The assembly sequence is to install the standard blocks alternately left and right, alternately install the adjacent blocks, and install the capping block. The capping block is assembled in the longitudinal direction. Connect 1/3, and then the assembly machine radially pushes it to the predetermined position and then inserts it longitudinally.

The waterproofing method of the shield tunnel includes structural self-waterproofing and other auxiliary measures, such as the outer waterproof coating of the segments, waterproofing of the segment joints, secondary lining, etc., among which the joints of the segments are the key point of waterproofing. Usually, the countermeasure for the waterproofing of segment joints is to use sealing materials, mainly by setting an annular gasket in the sealing groove around the segment. Compressive stress to stop water.

The assembly of the capping block is a process in which the lining is closed to form a ring. During the insertion process of the capping block, there will inevitably be mutual extrusion and friction between the sealing gasket of the capping block and the gaskets of the adjacent blocks on both sides, which will easily cause the gasket to move, misplace, and squeeze. Out of or even out of the sealing groove, affecting the waterproof performance of the segment joints and the quality of assembly. In response to this problem, water-based lubricants are often applied to the contact surfaces of the gaskets on both sides during segment assembly to reduce friction, but this problem is still not well solved. The phenomenon of water leakage from joints and joints occurs.

Contents of the invention

The purpose of the present invention is to aim at the mutual extrusion and friction between the sealing pad on the topping block and the sealing pads on the adjacent blocks on both sides in the process of assembling and inserting the topping block of the shield tunnel at present, which may easily cause the sealing pad to move, dislocate and squeeze. out, or even detached from the sealing groove, which affects the waterproof performance of the segment joints and the quality of the assembly. A shield tunnel segment gasket is provided, which can enhance the anti-sliding and anti-sliding properties between the gasket and the segment sealing groove. Extrusion ability can avoid the sliding and extrusion of the gasket during the assembly process of the shield tunnel capping block, and improve the assembly quality of the segments and the waterproof performance of the joints.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A shield tunnel segment gasket includes a gasket body, and the bottom of the gasket body is provided with an engaging structure matching the segment sealing groove.

In the present invention, an occlusal structure suitable for the segment sealing groove is provided at the bottom of the gasket body, and the occlusal structure can occlude the gasket and the segment sealing groove, thereby enhancing the bond between the gasket and the segment sealing groove. The anti-sliding and anti-extrusion ability between the shield tunnel can avoid the sliding and extrusion of the gasket during the assembly process of the shield tunnel capping block, improve the assembly quality of the segment and the waterproof performance of the seam, and the waterproof effect of the gasket on the seam of the segment Better, and the manufacturing cost is low.

As a preferred solution of the present invention, the engaging structure is a plurality of tenons provided at the bottom of the gasket body, and a plurality of suitable notches are correspondingly provided in the sealing groove of the segment. By setting matching tenon and tenon structures in the bottom of the gasket body and the segment sealing groove respectively, when in use, press the tenon on the gasket into the notch on the segment sealing groove, and the bottom of the gasket The top tenon and the tenon in the sealing groove are engaged with each other. This structure can provide the interlocking force in addition to the friction force between the sealing gasket and the groove when the capping block segment is inserted into the lining ring. Compared with the gasket with friction between the sealing grooves of the segment, due to the mutual friction and extrusion between the tenon and the tenon, the anti-slip and anti-extrusion capabilities between the gasket and the sealing groove of the segment are enhanced .

As a preferred solution of the present invention, the cross-sectional forms of the tenon and the tenon are both rectangular. By designing the cross-section of the tenon and tenon as a rectangle, it can not only meet the requirements of enhancing the anti-sliding and anti-extrusion capabilities between the gasket and the sealing groove of the segment, but also facilitate production and manufacturing, which is conducive to reducing product costs .

As a preferred solution of the present invention, the height of the tenon is smaller than the depth of the tenon. By setting the height of the tenon to be smaller than the depth of the tenon, the tenon can be completely pressed into the tenon, thereby ensuring that the bottom of the gasket body and the sealing groove of the segment are fully fitted, and the contact area between the two is increased to further enhance the seal Anti-slip and anti-extrusion capabilities between the gasket and the sealing groove of the segment.

As a preferred solution of the present invention, the length of the tenon is b, and the width and height of the tenon are both b/3, wherein b is the length of the bottom side of the gasket cross section. Setting the length of the tenon to be consistent with the length of the bottom side of the gasket cross section is beneficial to enhance the connection strength between the tenon and the gasket body, and avoid the situation where the tenon peels off the gasket body when the segments are assembled; and the tenon The width and height of the joint are both set to b/3, which can reduce the difficulty of assembly between the tenon and the tenon, and improve the assembly efficiency.

As a preferred solution of the present invention, the clear distance of the tenons is 5b, and the arrangement range of the tenons is 15b extending from the corner of the gasket to both sides, where b is the length of the bottom side of the gasket cross section. Since the gasket as a whole has a ring-shaped structure corresponding to the edge of the segment, the tenon is arranged within the range of 15b extending from the corner of the gasket to both sides, that is, it is not necessary to set the tenon on the entire length of the gasket, which is beneficial The product cost is reduced, and the installation efficiency of the gasket can be improved at the same time.

As a preferred solution of the present invention, the gasket is made of EPDM rubber.

As a preferred solution of the present invention, a plurality of holes are arranged longitudinally in the gasket body. By arranging a plurality of holes in the longitudinal direction of the gasket, when the segments are assembled, the gasket can be compressed and deformed under pressure to avoid cracks or fragmentation of the segment body due to excessive assembly extrusion force.

As a preferred solution of the present invention, the holes include round holes and U-shaped holes.

As a preferred solution of the present invention, the top of the gasket body is embedded with water-swellable rubber. By embedding water-expandable rubber on the top of the gasket body, when the contact joint of the segment leaks, the expanded rubber will expand and increase the compressive stress between the gasket contact surfaces, thereby achieving a further water-stopping effect.

In summary, owing to adopting above-mentioned technical scheme, the beneficial effect of the present invention is:

1. In the present invention, an occlusal structure matching the segment sealing groove is provided at the bottom of the gasket body, and the occlusal structure can occlude the gasket and the segment sealing groove, thereby strengthening the gasket and the segment sealing groove The anti-sliding and anti-extrusion capabilities between the grooves can prevent the gasket from sliding and extrusion during the assembly process of the shield tunnel capping block, and improve the assembly quality of the segment and the waterproof performance of the joint. Good waterproof effect, and low manufacturing cost;

2. In the present invention, matching tenon and tenon structures are respectively arranged in the bottom of the gasket body and the segment sealing groove, and the tenon on the gasket is pressed into the notch on the segment sealing groove during use. Yes, compared with the existing gasket that only relies on friction between the sealing groove of the segment, due to the mutual friction and extrusion between the tenon and the tenon, the gasket and the sealing groove of the segment are strengthened Anti-sliding, anti-extrusion ability;

3. The present invention designs the cross-section of the tenon and tenon as a rectangle, which can meet the requirements of enhancing the anti-sliding and anti-extrusion capabilities between the gasket and the sealing groove of the segment, and is convenient for production and manufacturing. Conducive to reducing product costs;

4. In the present invention, by setting the height of the tenon to be smaller than the depth of the tenon, the tenon can be completely pressed into the tenon, so as to ensure that the bottom of the gasket body is completely attached to the sealing groove of the segment, and the contact area between the two is increased , to further enhance the anti-sliding and anti-extrusion capabilities between the gasket and the sealing groove of the segment;

5. The present invention embeds water-swellable rubber on the top of the gasket body. When leakage occurs in the contact joint of the segment, the water-swellable rubber will expand after encountering water, thereby increasing the compressive stress between the contact surfaces of the gasket. Play a further water-stopping effect.

Description of drawings

Fig. 1 is a schematic diagram of the structure of the shield tunnel segment gasket in the present invention.

Fig. 2 is a front view of Fig. 1 .

FIG. 3 is a side view of FIG. 1 .

Fig. 4 is a schematic diagram of the sealing groove structure of the shield tunnel segment in the present invention.

Fig. 5 is a schematic diagram of the assembly of the shield tunnel segment gasket and segment in the present invention.

Fig. 6 is a front view of the gasket after the shield tunnel segments are assembled in the present invention.

Fig. 7 is a schematic structural diagram of another shield tunnel segment gasket in the present invention.

Marks in the figure: 1-shield segment, 11-sealing groove, 12-recess, 2-gasket, 21-gasket body, 22-tenon, 23-round hole, 24-U-shaped hole, 25 - Expanded rubber.

detailed description

Below in conjunction with accompanying drawing, the present invention is described in detail.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Example 1

This embodiment provides a shield tunnel segment gasket;

As shown in Figures 1-6, the shield tunnel segment gasket 2 in this embodiment includes a gasket body 21, and the bottom of the gasket body 21 is provided with a sealing groove 11 on the shield segment 1 Compatible occlusal structure.

In this embodiment, the engaging structure is a plurality of tenons 22 arranged at the bottom of the gasket body 21, and all the tenons are evenly spaced along the longitudinal direction of the gasket body, and the sealing groove 11 is correspondingly provided with Multiple matching rebates 12. By setting matching tenon and tenon structures in the bottom of the gasket body and the segment sealing groove respectively, when in use, press the tenon on the gasket into the notch on the segment sealing groove, and the bottom of the gasket The top tenon and the tenon in the sealing groove are engaged with each other. This structure can provide the interlocking force in addition to the friction force between the sealing gasket and the groove when the capping block segment is inserted into the lining ring. Compared with the gasket with friction between the sealing grooves of the segment, due to the mutual friction and extrusion between the tenon and the tenon, the anti-slip and anti-extrusion capabilities between the gasket and the sealing groove of the segment are enhanced .

In this embodiment, the cross-sectional forms of the tenon 22 and the tenon 12 are both rectangular. By designing the cross-section of the tenon and tenon as a rectangle, it can not only meet the requirements of enhancing the anti-sliding and anti-extrusion capabilities between the gasket and the sealing groove of the segment, but also facilitate production and manufacturing, which is conducive to reducing product costs .

In this embodiment, the height of the tenon 22 is smaller than the depth of the tenon 12 . By setting the height of the tenon to be smaller than the depth of the tenon, the tenon can be completely pressed into the tenon, thereby ensuring that the bottom of the gasket body and the sealing groove of the segment are fully fitted, and the contact area between the two is increased to further enhance the seal Anti-slip and anti-extrusion capabilities between the gasket and the sealing groove of the segment.

In this embodiment, the length of the tenon 22 is b, and the width and height of the tenon 22 are both b/3, where b is the length of the bottom side of the cross section of the gasket 2, specifically in this embodiment Tenon 6 is 10mm wide, 33mm long and 10mm high. Setting the length of the tenon to be consistent with the length of the bottom side of the gasket cross section is beneficial to enhance the connection strength between the tenon and the gasket body, and avoid the situation where the tenon peels off the gasket body when the segments are assembled; and the tenon The width and height of the joint are both set to b/3, which can reduce the difficulty of assembly between the tenon and the tenon, and improve the assembly efficiency.

In this embodiment, the clear distance of the tenon 22 is 5b, and the arrangement range of the tenon 22 is 15b extending from the corner of the gasket 2 to both sides, where b is the length of the bottom side of the cross section of the gasket 2 Specifically, the clear distance between adjacent tenons in this embodiment is 150mm, and the arrangement range of the tenons is 450mm from the corner of the gasket to both sides. Cross-sectional size, same number, same distribution of tenons. Since a single segment has a quadrilateral structure, and the gasket as a whole has a ring-shaped structure corresponding to the edge of the segment, the gasket will form a corner on the adjacent side of the segment to facilitate the installation of the gasket, and the tenon Arranged within the range of 15b extending from the corner of the gasket to both sides, that is, there is no need to set tenons on the entire length of the gasket, which is conducive to reducing product costs and improving the installation efficiency of the gasket.

In this embodiment, the sealing gasket 2 is made of EPDM rubber, and the rubber hardness is 62±5° (Shore A).

In this embodiment, a plurality of holes are arranged longitudinally in the gasket body, and the holes in this embodiment include round holes 23 and U-shaped holes 24, wherein round holes 23 are provided with multiple groups, and the diameter of each group is The size is inconsistent, and the size of the center of the round hole from the top of the gasket body is also inconsistent; a group of U-shaped holes 24 is provided, and the U-shaped opening is located on the bottom edge of the gasket body. By arranging a plurality of holes in the longitudinal direction of the gasket, when the segments are assembled, the gasket can be compressed and deformed under pressure to avoid cracks or fragmentation of the segment body due to excessive assembly extrusion force.

In this embodiment, an occlusal structure matching the segment sealing groove is provided at the bottom of the gasket body, and the occlusal structure can occlude the gasket and the segment sealing groove, thereby strengthening the gasket and the segment sealing groove The anti-sliding and anti-extrusion ability between them can avoid the sliding and extrusion of the gasket during the assembly process of the shield tunnel capping block, and improve the assembly quality of the segment and the waterproof performance of the joint. The effect is good, and the manufacturing cost is low.

Example 2

This embodiment provides another shield tunnel segment gasket;

As shown in Figure 7, the shield tunnel segment gasket 2 in this embodiment includes a gasket body 21, and the bottom of the gasket body 21 is provided with an engaging structure that matches the sealing groove on the shield segment , the occlusal structure is a plurality of tenons 22 arranged at the bottom of the gasket body 21, and a plurality of suitable concave tenons are correspondingly provided in the segment sealing groove, and at the same time, the gasket body is longitudinally A plurality of holes are provided, and the holes in this embodiment include round holes 23 and U-shaped holes 24 .

The gasket in this embodiment is basically the same as the gasket in Embodiment 1 in terms of overall structure and installation, except that the top of the gasket body 21 in this embodiment is embedded with a water-swellable rubber 25 . By embedding water-swellable rubber on the top of the gasket body, when the contact joint of the segment leaks, the water-swellable rubber will expand and increase the compressive stress between the contact surfaces of the gasket, thereby achieving a further water-stopping effect.

In this embodiment, an occlusal structure matching the segment sealing groove is provided at the bottom of the gasket body, and the occlusal structure can occlude the gasket and the segment sealing groove, thereby strengthening the gasket and the segment sealing groove The anti-sliding and anti-extrusion ability between them can avoid the sliding and extrusion of the gasket during the assembly process of the shield tunnel capping block, and improve the assembly quality of the segment and the waterproof performance of the joint. The effect is good, and the manufacturing cost is low; at the same time, by embedding the water-swellable rubber on the top of the gasket body, when the segment contact joint leaks, the water-swellable rubber will expand and increase the compressive stress between the gasket contact surfaces , play a further effect of water stop.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the principle of the present invention should be included in the protection scope of the present invention. Inside.

Claims (10)

1. a kind of duct pieces of shield tunnel sealing gasket, it is characterised in that including sealing pad body, the sealing gasket body bottom portion is provided with The occlusion structure being adapted with section of jurisdiction sealed groove.

2. duct pieces of shield tunnel sealing gasket according to claim 1, it is characterised in that the occlusion structure is located at described Multiple tenons of sealing gasket body bottom portion, the corresponding blind mortise provided with multiple adaptations in the section of jurisdiction sealed groove.

3. duct pieces of shield tunnel sealing gasket according to claim 2, it is characterised in that the section shape of the tenon and blind mortise Formula is rectangle.

4. duct pieces of shield tunnel sealing gasket according to claim 3, it is characterised in that the height of the tenon is less than described The depth of blind mortise.

5. the duct pieces of shield tunnel sealing gasket according to one of claim 2-4, it is characterised in that the length of the tenon is B, the width and height of the tenon are b/3, wherein, b is the sealing gasket cross section bottom length of side.

6. the duct pieces of shield tunnel sealing gasket according to one of claim 2-4, it is characterised in that the clear distance of the tenon is 5b, the arrangement scope of the tenon pads for self sealss extends each 15b at knuckle to both sides, wherein, b is sealing gasket cross section bottom The length of side.

7. the duct pieces of shield tunnel sealing gasket according to one of claim 1-4, it is characterised in that the sealing gasket is by ternary EP rubbers is made.

8. the duct pieces of shield tunnel sealing gasket according to one of claim 1-4, it is characterised in that in the sealing pad body Multiple holes are provided with along longitudinal direction.

9. duct pieces of shield tunnel sealing gasket according to claim 8, it is characterised in that described hole includes circular hole and U-shaped Hole.

10. the duct pieces of shield tunnel sealing gasket according to one of claim 1-4, it is characterised in that the sealing pad body Top is embedded with hydro-expansive rubber.