阅读说明：本技术 盾构始发施工洞门密封装置及方法 (Shield starting construction tunnel portal sealing device and method ) 是由 刘江 袁逢逢 李东泰 唐均利 夏站辉 张赛 赵康 汪越辉 其他发明人请求不公开姓名 于 2021-09-08 设计创作，主要内容包括：本发明公开了一种盾构始发施工洞门密封装置及方法,盾构始发施工洞门密封装置,包括洞门预埋钢环(1)、延伸钢环(2)、弧形密封钢板(4),洞门预埋钢环(1)与地连墙(300)连接,洞门预埋钢环(1)固定于结构侧墙(200)内,延伸钢环与洞门预埋钢环(1)连接,弧形密封钢板(4)的外围一侧直接或间接与延伸钢环密封连接,弧形密封钢板(4)的内围一侧与负环管片(3)密封连接,弧形密封钢板(4)上设置预留注浆孔(41)。本发明所公开的盾构始发施工洞门密封装置,结构简单巧妙,密封性好,可靠性强,可迅速建压,保证盾构始发安全。(The invention discloses a tunnel portal sealing device and method for shield starting construction, wherein the tunnel portal sealing device comprises a tunnel portal embedded steel ring (1), an extension steel ring (2) and an arc-shaped sealing steel plate (4), the tunnel portal embedded steel ring (1) is connected with an underground diaphragm wall (300), the tunnel portal embedded steel ring (1) is fixed in a structural side wall (200), the extension steel ring is connected with the tunnel portal embedded steel ring (1), one side of the periphery of the arc-shaped sealing steel plate (4) is directly or indirectly in sealing connection with the extension steel ring, one side of the inner periphery of the arc-shaped sealing steel plate (4) is in sealing connection with a negative ring pipe piece (3), and a reserved grouting hole (41) is formed in the arc-shaped sealing steel plate (4). The sealing device for the shield launching construction tunnel portal disclosed by the invention has the advantages of simple and ingenious structure, good sealing property and strong reliability, can build pressure quickly, and ensures the shield launching safety.)

1. Shield constructs construction portal sealing device that originates, a serial communication port, including pre-buried steel ring of portal (1), extend steel ring (2), arc sealing steel sheet (4), pre-buried steel ring of portal (1) is connected with ground even wall (300), pre-buried steel ring of portal (1) is fixed in structure side wall (200), it is connected with pre-buried steel ring of portal (1) to extend steel ring (2), periphery one side of arc sealing steel sheet (4) is direct or indirect and extends steel ring (2) sealing connection, the interior one side and the minus ring section of jurisdiction (3) sealing connection of arc sealing steel sheet (4), set up on the arc sealing steel sheet (4) and reserve slip casting hole (41), ground even wall (300), pre-buried steel ring of portal (1), extend steel ring (2), arc sealing steel sheet (4) to and enclose into a seal chamber between the minus ring section of jurisdiction (3).

2. The shield starting construction tunnel door sealing device according to claim 1, wherein more than one group of sealing bodies (7) are arranged in the sealing cavity, the upper ends of the sealing bodies (7) are connected with the extension steel ring (2), and the lower ends of the sealing bodies (7) are in contact connection with the negative ring pipe piece (3).

3. The shield starting construction tunnel door sealing device according to claim 2, wherein the sealing body (7) comprises a connecting body (73), and a sealing rubber plate (71) and a spring folding plate (72) are arranged at two sides of the connecting body (73), and the spring folding plate (72) is hinged with the connecting body (73).

4. The shield starting construction tunnel portal sealing device according to claim 1, 2 or 3, wherein more than one group of tunnel portal sealing brushes are arranged in the sealing cavity, the upper ends of the tunnel portal sealing brushes are fixed on the inner wall of the extension steel ring, and the lower ends of the tunnel portal sealing brushes are in contact connection with the negative ring pipe piece (3).

5. The shield originating construction portal sealing device according to claim 4, wherein the extension steel ring (2) comprises a first extension steel ring (21) connected with the portal pre-buried steel ring (1), and a second extension steel ring (22) connected with the first extension steel ring (21); the upper end of the tunnel door sealing brush is fixed on the inner wall of the first section of the extending steel ring (21).

6. The shield originating construction tunnel door sealing device according to claim 5, characterized in that the second section of the extended steel ring (22) is provided with a fixed connecting piece (8), and the sealing body (7) is connected with the fixed connecting piece (8) through a fastener; meanwhile, the contact part of the sealing body (7) and the second section of the extending steel ring (22) is connected by welding.

7. The shield starting construction tunnel door sealing device according to claim 4, wherein a negative ring segment pre-embedded steel plate (31) is arranged in the negative ring segment (3), and the arc-shaped sealing steel plate (4) is welded with the negative ring segment pre-embedded steel plate (31).

8. The shield starting construction portal sealing device according to claim 1, wherein more than one group of inclined grouting pipes (17) are obliquely arranged in the structural side wall (200) from the structural side wall (200) to the underground diaphragm wall (300), the inclined grouting pipes (17) penetrate through the portal embedded steel ring (1), the lower ports of the inclined grouting pipes (17) are positioned in the sealing cavity below the portal embedded steel ring (1), and the upper ports of the inclined grouting pipes (17) are communicated with the outside.

9. The method for sealing the shield starting construction tunnel portal is characterized in that the shield starting construction tunnel portal sealing device according to claim 1 is adopted, and comprises the following steps:

a: installing a portal pre-buried steel ring (1) during construction of the structural side wall (200);

b: connecting the portal embedded steel ring (1) with the extension steel ring (2);

c: connecting the extension steel ring (2) with an arc-shaped sealing steel plate (4);

d: connecting the arc-shaped sealing steel plate (4) with the negative ring pipe piece (3);

the tunnel portal is characterized in that a tunnel portal embedded steel ring (1), an extension steel ring (2), an arc-shaped sealing steel plate (4) and a negative ring pipe piece (3) are connected with each other and then enclose a sealing cavity with a ground connecting wall (300).

10. The shield originating construction tunnel door sealing method of claim 9,

in the step a: when the portal embedded steel ring (1) is installed in the construction of the structural side wall (200), the inclined grouting pipe (17) is installed at the same time;

in the step b: before the extension steel ring (2) is connected with the portal embedded steel ring (1), the sealing body (7) and the portal sealing brush are connected with the extension steel ring (2);

before the step d, pre-burying a negative ring duct piece pre-buried steel plate (31) on the outer wall of the negative ring duct piece (3), and welding an arc-shaped sealing steel plate (4) with the negative ring duct piece pre-buried steel plate (31).

Technical Field

The invention belongs to the technical field of tunnel portal sealing construction, and particularly relates to a tunnel portal sealing device and method for shield starting construction.

Background

In the starting construction process of the shield, in order to ensure the safety of the end, water and soil loss of the end is required to be prevented, the position pressure of a cutter head is required to be established as early as possible so as to stabilize the stratum of the end, the end of an arc-shaped plate is not sealed, because gaps exist among a portal steel ring, a shield body and a pipe piece, a method of installing a curtain rubber plate and a folding pressing plate on the portal embedded steel ring is generally adopted, and water and soil are wrapped by the curtain and are reversely pressed on the shield body and the pipe piece in the advancing process of the shield machine so as to achieve the purpose of portal sealing; however, the shield machine is often damaged due to extrusion and sealing of the shield body, leakage is very easy to occur at the portal under the action of high water pressure, starting pressure building is difficult, end soil and water loss can be caused due to long-term leakage, even serious consequences such as pipeline damage and end collapse are caused, and great safety risk exists; the conventional leakage plugging is performed by using cotton yarn or quick-drying cement, and the plugging is difficult and is easy to flow in series.

Disclosure of Invention

The invention relates to a sealing device and a sealing method for a shield starting construction tunnel portal, which are designed on the basis of a conventional sealing method and can effectively solve the problems that the seal is damaged due to the fact that an arc plate end is not sealed, a shield body is often extruded and sealed when a shield machine passes through the tunnel portal in the background technology, the tunnel portal is easy to leak under the action of high water pressure, starting pressure building is difficult, end soil and water loss can be caused due to long-term leakage, and even serious consequences such as pipeline damage, end collapse and the like can be caused.

The invention is realized by the following technical scheme:

the invention provides a tunnel portal sealing device for shield starting construction, which comprises a tunnel portal embedded steel ring, an extension steel ring and an arc-shaped sealing steel plate, wherein the tunnel portal embedded steel ring is connected with a ground connection wall, the tunnel portal embedded steel ring is fixed in a structural side wall, the extension steel ring is connected with the tunnel portal embedded steel ring, one side of the periphery of the arc-shaped sealing steel plate is directly or indirectly connected with the extension steel ring in a sealing manner, one side of the periphery of the arc-shaped sealing steel plate is connected with a negative ring pipe piece in a sealing manner, a reserved grouting hole is arranged on the arc-shaped sealing steel plate, and a sealing cavity is defined by the ground connection wall, the tunnel portal embedded steel ring, the extension steel ring, the arc-shaped sealing steel plate and the negative ring pipe piece. The grouting pipeline of the shield machine is arranged below a portal embedded steel ring on the lower side of the side wall of the structure, and a reserved grouting hole in the arc-shaped sealing steel plate) is connected to a grouting machine through a pipeline.

Through adopting above-mentioned technical scheme, peripheral one side of arc sealing steel sheet is direct or indirect and extension steel ring sealing connection, the embedded steel sheet sealing connection of negative ring canal piece on the interior one side of arc sealing steel sheet and the negative ring canal piece outer wall, set up on the arc sealing steel sheet and reserve the slip casting hole, the slip casting machine pours into grout into through reserving the slip casting hole, and overall sealing performance is good, and structural strength is high, and the pouring into of grout of being convenient for simultaneously, under sealed tight condition, builds the pressure rapidly, guarantees the shield and constructs the safety of originating.

As a further improvement of the invention, a group of sealing bodies are arranged in the sealing cavity, the upper ends of the sealing bodies are connected with the extension steel ring, and the lower ends of the sealing bodies are in contact connection with the negative ring pipe sheet. The seal body divides the seal cavity into two cavities, and the overall sealing performance is improved.

As a further improvement of the invention, the sealing body comprises a connecting body, and a sealing rubber plate and a folding elastic pressing plate which are arranged at two sides of the connecting body, wherein the folding elastic pressing plate is hinged with the connecting body. The bending direction of the sealing body is consistent with the propelling direction of the shield. Through adopting above-mentioned technical scheme, the setting of first sealed offset plate and first folding elasticity clamp plate, with mutual coordination such as portal sealing brush, grease, section of jurisdiction, extension steel ring, constitute first seal chamber, play first sealed effect.

The sealing body can also be two sets, the first set is arranged between the first section extension steel ring and the second section extension steel ring, and the second set is arranged between the second section extension steel ring and the arc-shaped sealing steel plate.

Through adopting above-mentioned technical scheme, the setting of the sealed offset plate of second way and the second way is rolled over the bullet clamp plate, with first sealed offset plate, first one roll over mutual coordination such as bullet clamp plate, grease, section of jurisdiction, extension steel ring, constitute second seal chamber, play the sealed effect of second way. If the first sealing is insufficient, the second sealing can play a role in secondary sealing protection.

As a further improvement of the invention, more than one group of hole door sealing brushes are arranged in the sealing cavity, the upper ends of the hole door sealing brushes are fixed on the inner wall of the extension steel ring, and the lower ends of the hole door sealing brushes are in contact connection with the negative ring pipe sheet. The extension steel ring comprises a first section of extension steel ring, and the hole door sealing brush is connected to the inner wall of the first section of extension steel ring. By adopting the technical scheme, when the shield starts to pass through the tunnel portal sealing device, the bending direction of the tunnel portal sealing brush is consistent with the propelling direction of the shield, the flow direction of the tunnel portal sealing brush is opposite to the flow direction of substances such as water, sand or slurry, and the water and soil pressure acts on the tunnel portal sealing brush, so that the effect of relieving the outward outflow of water and soil can be achieved, and the subsequent sealing is facilitated.

The extension steel ring is provided with a grease injection hole. The hole door sealing brush comprises a first hole door sealing brush and a second hole door sealing brush, and the grease injection hole is formed in the side wall of a first section extending steel ring between the first hole door sealing brush and the second hole door sealing brush. The subsequent sealing effect can be enhanced by adopting two tunnel portal sealing brushes. Be provided with the grease filling hole on the lateral wall of first section extension steel ring between first tunnel portal sealing brush and second tunnel portal sealing brush, can be convenient for the grease and pour into, be favorable to sealed.

As a further improvement of the invention, the extension steel ring comprises a first section of extension steel ring connected with the portal embedded steel ring and a second section of extension steel ring connected with the first section of extension steel ring; the upper end of the tunnel door sealing brush is fixed on the inner wall of the first section of the extending steel ring. More than one group of grease injection holes are arranged on the side wall of the second section of the extension steel ring.

As a further improvement of the invention, a fixed connecting piece is arranged on the second section of the extending steel ring, and the sealing body is connected with the fixed connecting piece through a fastening piece; meanwhile, the contact part of the sealing body and the second section of the extension steel ring is connected through welding.

When the seal is two sets of, first group seal set up in first section extension steel ring and second section extension steel ring between, the upper end and the fixed connector of seal pass through the fastener to be connected, and seal, fixed connector and first section extension steel ring, second section extension steel ring contact part still pass through welded connection, guarantee the leakproofness. The second group of sealing body is arranged between the second section extension steel ring and the arc-shaped sealing steel plate, the upper end of the sealing body is connected with the fixed connecting piece through a fastener, the arc-shaped sealing steel plate is directly connected with the sealing body, and the sealing body, the fixed connecting piece and the contact part of the second section extension steel ring and the arc-shaped sealing steel plate are further connected through welding, so that the sealing performance is ensured. The arc-shaped sealing steel plate is connected with the sealing body through the connecting plate in a welding mode, and the overall connection stability and the structural strength are improved.

As a further improvement of the invention, the embedded steel plate of the negative ring pipe piece is arranged in the negative ring pipe piece, and the arc-shaped sealing steel plate is welded with the embedded steel plate of the negative ring pipe piece. The embedded steel plate of the negative ring duct piece is welded with anchor bars, the anchor bars are placed into the negative ring duct piece, and the diameter of each anchor bar is preferably 20mm and the length of each anchor bar is 200 mm.

As a further improvement of the invention, more than one group of inclined grouting pipes are obliquely arranged in the structural side wall from the structural side wall to the ground connecting wall, the inclined grouting pipes penetrate through the portal embedded steel ring, the lower end ports of the inclined grouting pipes are positioned in the sealing cavity below the portal embedded steel ring, and the upper end ports of the inclined grouting pipes are communicated with the outside.

Set up the slip casting pipe of inserting to one side in the structure side wall, increased the overall structure intensity of structure side wall on the one hand, secondly when seal chamber is especially close to shield structure machine one side above that and can't be filled up by the slip casting, if have confined water to exist in the meeting underground, cause the soil body to gush suddenly easily, can carry out the slip casting through the slip casting pipe of inserting to one side of reserving this moment, improve slip casting efficiency and guarantee the pressure in the seal chamber, potential soil body potential safety hazard when avoiding emergency.

As a further improvement of the invention, a temporary support is arranged below the extension steel ring, and a structural bottom plate is arranged below the temporary support; the temporary support is a temporary concrete support or a steel structure support. The included angle between the circle center of the extended steel ring and two end points in contact with the temporary support is R, R is 40-90 degrees, and preferably R is 40 degrees.

The method for sealing the tunnel portal in the shield starting construction adopts the device for sealing the tunnel portal in the shield starting construction, and comprises the following steps:

a: installing a portal pre-buried steel ring during construction of a structural side wall;

b: connecting the portal embedded steel ring and the extension steel ring;

c: connecting the extension steel ring with the arc-shaped sealing steel plate;

d: connecting the arc-shaped sealing steel plate with the negative ring pipe sheet;

the hole door embedded steel ring, the extension steel ring, the arc-shaped sealing steel plate and the negative ring pipe sheet are connected and then form a sealing cavity with the ground wall.

As a further improvement of the present invention, in step a: when the pre-buried steel ring of the tunnel door is installed in the construction of the structural side wall, the inclined-insertion grouting pipe is installed at the same time;

in the step b: before the extension steel ring is connected with the portal embedded steel ring, the sealing body and the portal sealing brush are connected with the extension steel ring;

and d, pre-embedding a negative ring pipe piece pre-embedded steel plate on the outer wall of the negative ring pipe piece, and welding the arc-shaped sealing steel plate and the negative ring pipe piece pre-embedded steel plate.

As a further improvement of the invention, the method for sealing the tunnel portal in the shield starting construction further comprises the following steps:

injecting shield tail grease through a grease injection hole in the advancing process of the shield machine;

in the step d: after the shield machine completely enters the second section of the extension steel ring, welding the arc-shaped sealing steel plate with the sealing body and the negative ring pipe piece pre-embedded steel plate;

after the shield machine completely enters the second section of the extension steel ring, welding the arc-shaped sealing steel plate with the sealing body and the negative ring pipe piece pre-embedded steel plate; after the shield machine passes through the first tunnel portal sealing brush, injecting cement paste into the tunnel portal through a reserved grouting hole by using a grouting machine; by adopting the technical scheme, the shield tunneling machine has the advantages of strong operability, good sealing performance, capability of rapidly building pressure, capability of ensuring the safety of shield tunneling and convenience for popularization and application.

As a further improvement of the invention, the processing length A of the embedded steel plate of the negative ring pipe piece ranges from 10cm to 70 cm. Through adopting above-mentioned technical scheme, can be convenient for the pre-buried steel sheet of negative ring canal piece and extend the being connected of steel ring, the tolerable error range is reasonable, maneuverability improves during the field installation.

The sealing device for the shield starting construction tunnel portal has at least the following beneficial effects: arc sealing steel plate, the setting of the pre-buried steel sheet of burden ring canal piece, be convenient for sealing connection, and joint strength is high, compressive property is good, adopt this portal sealing device can reach sealed tight, improve overall structure intensity, realize building the pressure fast, if meet when having the confined water to exist underground, cause the soil body to gush suddenly easily, can carry out the slip casting through the oblique slip casting pipe of reserving this moment, improve slip casting efficiency and guarantee the pressure in the seal chamber, latent soil body potential safety hazard when avoiding emergency, guarantee the shield and construct the purpose of starting safety.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic structural diagram of a shield starting construction tunnel portal sealing device according to an embodiment of the present invention;

FIG. 2 is a schematic view of a portion of the structure of FIG. 1;

FIG. 3 is an enlarged view of part I of FIG. 2;

fig. 4 is a schematic structural view of the mounting of the embedded steel plate 31 of the negative ring pipe piece on the negative ring pipe piece;

FIG. 5 is a schematic structural diagram of the arc-shaped sealing steel plates after being spliced;

fig. 6 is a sectional view of an arc-shaped sealing steel plate.

In the figure: 1-embedding a steel ring in the portal; 2-extending the steel ring; 21-a first section of extended steel ring; 22-a second section of extended steel ring; 3-negative ring pipe piece; 31-embedding steel plates in the negative ring pipe sheets; 32-anchor bars; 4, arc-shaped sealing steel plates; 41-reserving grouting holes; 5, a first tunnel portal sealing brush; 6-a second tunnel portal sealing brush; 7, sealing; 71-sealing rubber plate; 72-folding and elastic pressing plate; 73-a linker; 8, fixing a connecting piece; 9, temporary supporting; 10-structural backing plate; 13-grease injection hole; 15-grouting machine; 17-inserting a grouting pipe obliquely; 100-a shield machine; 200-structural side walls; 300-diaphragm wall.

Detailed Description

To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments.

In the description of the present application, it is to be understood that the terms "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the indicated orientations and positional relationships based on the orientation shown in the drawings for convenience in describing the application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting with respect to the present application.

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 application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Example 1

Referring to fig. 1 to 6, the shield starting construction portal sealing device comprises a portal pre-buried steel ring 1, an extension steel ring 2 and an arc-shaped sealing steel plate 4, wherein the portal pre-buried steel ring 1 is connected with a ground connection wall 300, the portal pre-buried steel ring 1 is fixed in a structural side wall 200, the extension steel ring is connected with the portal pre-buried steel ring 1, one side of the periphery of the arc-shaped sealing steel plate 4 is connected with the extension steel ring 2 in a sealing manner, one side of the periphery of the arc-shaped sealing steel plate 4 is connected with a negative ring pipe piece 3 in a sealing manner, a reserved grouting hole 41 is formed in the arc-shaped sealing steel plate 4, the ground connection wall 300, the portal pre-buried steel ring 1, the extension steel ring, the arc-shaped sealing steel plate 4 and the negative ring pipe piece 3 are enclosed to form a sealing cavity. The grouting pipeline of the shield machine 100 is arranged below the portal embedded steel ring 1 on the lower side of the structural side wall 200, and the reserved grouting holes 41 in the arc-shaped sealing steel plate 4 are connected to the grouting machine 15 through pipelines.

By adopting the technical scheme, one side of the periphery of the arc-shaped sealing steel plate 4 is directly or indirectly in sealing connection with the extension steel ring 2, one side of the inner periphery of the arc-shaped sealing steel plate 4 is in sealing connection with the embedded steel plate of the negative ring pipe piece on the outer wall of the negative ring pipe piece, the reserved grouting holes 41 are formed in the arc-shaped sealing steel plate 4, the grouting machine 15 injects cement slurry through the reserved grouting holes 41, the overall sealing performance is good, the structural strength is high, meanwhile, the injection of the cement slurry is facilitated, the pressure is quickly built under the tight sealing condition, and the starting safety of the shield is ensured.

One side of the periphery of the arc-shaped sealing steel plate 4 is directly extended to form a steel ring 2 for sealing connection; a group of sealing bodies 7 are arranged in the sealing cavity, the upper ends of the sealing bodies 7 are connected with the extension steel rings 2, and the lower ends of the sealing bodies 7 are in contact connection with the negative ring pipe sheets 3. The sealing body 7 divides the sealing cavity into two cavities, so that the overall sealing performance is improved. The sealing body 7 comprises a connecting body 73, a sealing rubber plate 71 and a folding elastic pressing plate 72 which are arranged at two sides of the connecting body 73, and the folding elastic pressing plate 72 is hinged with the connecting body 73. The bending direction of the sealing body 7 is consistent with the advancing direction of the shield.

Through adopting above-mentioned technical scheme, sealed offset plate 71, roll over the interact coordination such as bullet pressure plate 72 and portal sealing brush, grease, section of jurisdiction, extension steel ring, constitute first seal chamber, play first sealed effect.

Two sets of tunnel portal sealing brushes are arranged in the sealing cavity and comprise a first tunnel portal sealing brush 5 and a second tunnel portal sealing brush 6, the upper end of the tunnel portal sealing brush is fixed on the inner wall of the extension steel ring 2, and the lower end of the tunnel portal sealing brush is in contact connection with the negative ring pipe piece 3. Can strengthen subsequent sealed effect through adopting twice portal sealing brush, extend steel ring 2 and include first section extension steel ring 21, portal sealing brush connects on the inner wall of first section extension steel ring 21. By adopting the technical scheme, when the shield starts to pass through the tunnel portal sealing device, the bending direction of the tunnel portal sealing brush is consistent with the propelling direction of the shield, the flow direction of the tunnel portal sealing brush is opposite to the flow direction of substances such as water, sand or slurry, and the water and soil pressure acts on the tunnel portal sealing brush, so that the effect of relieving the outward outflow of water and soil can be achieved, and the subsequent sealing is facilitated.

Two sets of seal brushes and a set of seal, with ground even wall 300, the pre-buried steel ring 1 of portal, extension steel ring, arc sealing steel plate 4 to and the sealed cavity who encloses between the negative ring canal piece 3 has divided into 4 sealed chambeies, even one of them group of seal brushes or seal breaks down, can not influence holistic leakproofness yet, has guaranteed the compressive strength in the portal.

The grease injecting hole 13 is arranged on the side wall of the first section of the extending steel ring 21 between the first tunnel portal sealing brush 5 and the second tunnel portal sealing brush 6. Be provided with grease filling hole 13 on the lateral wall of first section extension steel ring between first tunnel portal sealing brush and second tunnel portal sealing brush, can be convenient for grease injection, be favorable to sealed.

The extension steel ring 2 is provided with a grease injection hole 13.

The extension steel ring 2 comprises a first section of extension steel ring 21 connected with the portal embedded steel ring 1 and a second section of extension steel ring 22 connected with the first section of extension steel ring 21; the upper end of the tunnel door sealing brush is fixed on the inner wall of the first section of the extension steel ring 21. More than one set of grease injection holes 13 are arranged on the side wall of the second section of the extension steel ring 22.

The second section of the extension steel ring 22 is provided with a fixed connecting piece 8, and the sealing body 7 is connected with the fixed connecting piece 8 through a fastening piece; and the contact part of the sealing body 7 and the second section of the extension steel ring 22 is connected by welding.

The embedded steel plate 31 of the negative ring pipe piece is arranged in the negative ring pipe piece 3, and the arc-shaped sealing steel plate 4 is welded with the embedded steel plate 31 of the negative ring pipe piece. The embedded steel plate 31 of the negative ring segment is welded with anchor bars 32, the anchor bars 32 are placed in the negative ring segment 3, and the diameter of the anchor bars 32 is preferably 20mm and 200mm long.

A temporary support 9 is arranged below the extension steel ring 2, and a structural bottom plate 10 is arranged below the temporary support 9; the temporary support 9 is a temporary concrete support. The included angle between the circle center of the extended steel ring 2 and two end points in contact with the temporary support 9 is R, R is 40-90 degrees, and preferably R is 60 degrees. When R is 60 degrees, the used concrete amount is minimum under the condition of meeting the stability and the supporting strength, and the highest cost performance is achieved.

A group of two inclined grouting pipes 17 is obliquely arranged from the structural side wall 200 to the ground connecting wall 300 in the structural side wall 200, the inclined grouting pipes 17 penetrate through the portal embedded steel ring 1, the lower end ports of the inclined grouting pipes 17 are located in a sealing cavity below the portal embedded steel ring 1, and the upper end ports of the inclined grouting pipes 17 are communicated with the outside.

The method for sealing the tunnel portal in the shield starting construction adopts the device for sealing the tunnel portal in the shield starting construction, and comprises the following steps:

a: installing a portal embedded steel ring 1 during construction of the structural side wall 200;

b: connecting the portal embedded steel ring 1 with the extension steel ring 2;

c: connecting the extension steel ring 2 with an arc-shaped sealing steel plate 4;

d: connecting an arc-shaped sealing steel plate 4 with the negative ring pipe piece 3;

the hole door embedded steel ring 1, the extension steel ring 2, the arc-shaped sealing steel plate 4 and the negative ring pipe piece 3 are connected with each other and then enclose a sealing cavity with the ground connecting wall 300.

As a further improvement of the present invention, in step a: when the portal embedded steel ring 1 is installed in the construction of the structural side wall 200, the inclined grouting pipe 17 is installed at the same time;

in the step b: before the extension steel ring 2 is connected with the portal embedded steel ring 1, the sealing body 7 and the portal sealing brush are connected with the extension steel ring 2;

before the step d, pre-burying a negative ring pipe piece pre-buried steel plate 31 on the outer wall of the negative ring pipe piece 3, and welding an arc-shaped sealing steel plate 4 with the negative ring pipe piece pre-buried steel plate 31.

The method for sealing the tunnel portal in shield starting construction further comprises the following steps:

in the advancing process of the shield tunneling machine 100, shield tail grease is injected through the grease injection hole 13;

in the step d: after the shield tunneling machine 100 completely enters the second section of the extension steel ring 22, welding the arc-shaped sealing steel plate 4 with the sealing body 7 and the negative ring pipe piece pre-embedded steel plate 31;

the portal embedded steel ring 1 is arranged on the structure side wall 200, and the ground connecting wall 300 is positioned on the left side of the structure side wall 200. The sealing connection of the present application includes, but is not limited to, welding. The extension steel ring 2 comprises a first section extension steel ring 21, the tunnel portal sealing brush is connected to the inner wall of the first section extension steel ring 21, and the tunnel portal sealing brush comprises a first tunnel portal sealing brush 5 and a second tunnel portal sealing brush 6. Between the first tunnel portal sealing brush 5 and the second tunnel portal sealing brush 6, a grease filling hole 13 is arranged on the side wall of the first section of the extension steel ring 21.

The side wall of the second section of the extension steel ring 22 is provided with a grease injection hole 13. The reserved grouting holes 41 on the arc-shaped sealing steel plate 4 are connected to the grouting machine 15 through pipelines.

After the shield tunneling machine 100 completely enters the second section of the extension steel ring 22, welding the arc-shaped sealing steel plate 4 with a second folding elastic pressing plate and a negative ring pipe sheet embedded steel plate 31; specifically, the periphery side of the arc-shaped sealing steel plate 4 is welded with the second bending and pressing plate, and the inner periphery side of the arc-shaped sealing steel plate 4 is welded with the embedded steel plate 31 of the negative ring pipe piece on the outer wall of the negative ring pipe piece 3.

In the implementation process of the invention, the portal pre-buried steel ring 1, the first section of extension steel ring 21 and the second section of extension steel ring 22 can be manufactured in blocks and assembled on site, and bolt holes and grease injection holes need to be reserved; in order to reduce the abrasion loss of the first tunnel portal sealing brush 5 and the second tunnel portal sealing brush 6 and enhance the sealing effect, hand greasing is required to be filled in the steel wires of the first tunnel portal sealing brush 5 and the second tunnel portal sealing brush 6; when the duct piece is produced, the central position of the embedded steel plate 31 of the negative ring duct piece in the length direction is determined according to the length of the extension steel ring, in order to avoid errors, the processing length A of the embedded steel plate 31 of the negative ring duct piece is 10cm-70cm, preferably 60cm, the thickness is 10mm-20mm, preferably 16 mm. Through adopting above-mentioned technical scheme, can be convenient for the pre-buried steel sheet of negative ring canal piece and extend the being connected of steel ring, the tolerable error range is reasonable, maneuverability improves during the field installation.

Referring to fig. 4, the anchor bars 32 are further welded on the embedded steel plate 31 of the negative ring segment, the anchor bars 32 are placed in the negative ring segment 3, and the diameter of the anchor bars 32 is preferably 20mm and the length is 200 mm.

The arc-shaped sealing steel plates 4 are manufactured in blocks and welded on site, referring to fig. 5, after being spliced, the arc-shaped sealing steel plates 4 form a ring shape, reserved grouting holes 41 are uniformly or unevenly distributed on the ring-shaped sealing steel plates, the width B of each arc-shaped sealing steel plate 4 can be 200mm-400mm, preferably 300mm, and the thickness of each arc-shaped sealing steel plate 4 can be 10mm-20mm, preferably 16 mm.

When the shield machine 100 passes through, injecting shield tail grease through the grease injection hole 13 for sealing, and after the shield machine 100 completely enters the second section of the extension steel ring 21, welding the arc-shaped sealing steel plate 4 with the sealing body and the negative ring pipe piece pre-embedded steel plate 31; after the shield machine 100 passes through the first tunnel portal sealing brush 5, cement slurry is injected into the tunnel portal sealing brush through a reserved grouting hole 41 by using a grouting machine 15; by adopting the technical scheme, the shield tunneling machine has the advantages of strong operability, good sealing performance, capability of rapidly building pressure, capability of ensuring the safety of shield tunneling and convenience for popularization and application.

The sealing device for the shield starting construction tunnel portal has at least the following beneficial effects: arc sealing steel plate, the setting of the pre-buried steel sheet of burden ring canal piece, be convenient for sealing connection, and joint strength is high, compressive property is good, adopt this portal sealing device can reach sealed tight, improve overall structure intensity, realize building the pressure fast, if meet when having the confined water to exist underground, cause the soil body to gush suddenly easily, can carry out the slip casting through the oblique slip casting pipe of reserving this moment, improve slip casting efficiency and guarantee the pressure in the seal chamber, latent soil body potential safety hazard when avoiding emergency, guarantee the shield and construct the purpose of starting safety.

Example 2

This example differs from example 1 in that:

shield constructs construction portal sealing device that starts, including the pre-buried steel ring of portal 1, extend steel ring 2, arc sealing steel plate 4, pre-buried steel ring of portal 1 is connected with ground even wall 300, pre-buried steel ring of portal 1 is fixed in structure side wall 200, it is connected with pre-buried steel ring 1 of portal to extend steel ring, peripheral one side of arc sealing steel plate 4 and extension steel ring are connected indirectly between 2, the interior one side and the negative ring pipe piece 3 sealing connection of arc sealing steel plate 4, set up on the arc sealing steel plate 4 and reserve slip casting hole 41, ground even wall 300, pre-buried steel ring of portal 1, extend the steel ring, arc sealing steel plate 4, and enclose into a seal chamber between the negative ring pipe piece 3. One side of the periphery of the arc-shaped sealing steel plate 4 is hermetically connected with the extension steel ring 2 through a sealing body 7.

The sealing body 7 is divided into two groups, the first group is arranged between the first section extension steel ring 21 and the second section extension steel ring 22, and the second group is arranged between the second section extension steel ring 22 and the arc-shaped sealing steel plate 4.

Through adopting above-mentioned technical scheme, mutual coordination such as first group seal, second group seal, grease, section of jurisdiction, extension steel ring constitutes second seal chamber, plays the second and says sealed effect, can improve sealing performance. If the first sealing is insufficient, the second sealing can play a role in secondary sealing protection.

When the seal 7 is two sets of, first group seal 7 sets up and extends between steel ring 22 in first section extension steel ring 21 and second section extension steel ring, and the upper end and the fixed connector 8 of seal 7 pass through the fastener to be connected, and seal 7, fixed connector 8 and first section extension steel ring 21, second section extension steel ring 22 contact segment still pass through welded connection, guarantee the leakproofness. The second group seal 7 sets up and extends between steel ring 22 and the arc sealed steel sheet 4 in the second section, and seal 7 upper end is connected through the fastener with fixed connection spare 8, and arc sealed steel sheet 4 is direct to be connected with seal 7, and seal 7, fixed connection spare 8 and second section extend steel ring 22, arc sealed steel sheet 4 contact segment still pass through welded connection, guarantee the leakproofness. The arc-shaped sealing steel plate 4 and the sealing body 7 are connected through the connecting plate in a welded mode, and overall connection stability and structural strength are improved.

This embodiment is two sets of seal brushes and two sets of group's seals, with ground even wall 300, the pre-buried steel ring 1 of portal, extension steel ring, arc sealing steel plate 4 to and the seal chamber who encloses between the negative ring canal piece 3 has divided into 5 sealed chambeies, even one of them group of seal brush or seal break down, can not influence holistic leakproofness yet, has guaranteed the compressive strength in the portal, improves the security of construction.

Three groups of six inclined grouting pipes 17 are obliquely arranged in the structural side wall 200 from the structural side wall 200 to the ground connecting wall 300, the inclined grouting pipes 17 penetrate through the portal embedded steel ring 1, the lower end opening of each inclined grouting pipe 17 is located in a sealing cavity below the portal embedded steel ring 1, and the upper end opening of each inclined grouting pipe 17 is communicated with the outside.

A temporary support 9 is arranged below the extension steel ring 2, and a structural bottom plate 10 is arranged below the temporary support 9; the temporary support 9 is a temporary concrete support. The included angle between the circle center of the extended steel ring 2 and two end points in contact with the temporary support 9 is R, R is 40-90 degrees, and preferably R is 75 degrees. When R is 75 °, the area enclosed by the temporary support 9 is larger, the support strength is stronger, but the time and resources are more consumed.

Example 3

This example differs from example 1 in that:

the sealing body 7 is a group, and the first group is arranged between the first section of the extension steel ring 21 and the second section of the extension steel ring 22. The seal body 7 is a pressure spring sealing rod which comprises a pressure rod, a rubber sealing ring is arranged at the head of the pressure spring sealing rod, and a pressure spring is arranged between the pressure rod and the rubber sealing ring.

One side of the periphery of the arc-shaped sealing steel plate 4 is hermetically connected with the extension steel ring 2 through a sealing body 7,

a group of tunnel portal sealing brushes are arranged in the sealing cavity, the upper ends of the tunnel portal sealing brushes are fixed on the inner wall of the extension steel ring 2, and the lower ends of the tunnel portal sealing brushes are in contact connection with the negative ring pipe piece 3. The extension steel ring 2 comprises a first section of extension steel ring 21, and the portal sealing brush is connected to the inner wall of the first section of extension steel ring 21. By adopting the technical scheme, when the shield starts to pass through the tunnel portal sealing device, the bending direction of the tunnel portal sealing brush is consistent with the propelling direction of the shield, the flow direction of the tunnel portal sealing brush is opposite to the flow direction of substances such as water, sand or slurry, and the water and soil pressure acts on the tunnel portal sealing brush, so that the effect of relieving the outward outflow of water and soil can be achieved, and the subsequent sealing is facilitated.

The hole door sealing brushes form a group, and the grease injection hole 13 is arranged on the side wall of the first section of the extension steel ring 21. Through setting up a set of hole door seal brush, saved the material on the one hand, secondly can strengthen subsequent sealed effect equally, be provided with grease filling hole 13, the grease of can being convenient for is poured into, is favorable to sealing.

Five groups of inclined grouting pipes 17 are obliquely arranged from the structural side wall 200 to the ground connecting wall 300 in the structural side wall 200, the inclined grouting pipes 17 penetrate through the portal embedded steel ring 1, the lower ports of the inclined grouting pipes 17 are positioned in a sealing cavity below the portal embedded steel ring 1, and the upper ports of the inclined grouting pipes 17 are communicated with the outside.

Set up in structure side wall 200 and inserted slip casting pipe 17 to one side, increased the overall structure intensity of structure side wall on the one hand, secondly when seal chamber is especially close to shield structure machine 100 one side above that and can't be filled up by the slip casting, if have confined water to exist in the underground, cause the soil body to gush suddenly easily, can carry out the slip casting through the oblique slip casting pipe 17 of reserving this moment, improve slip casting efficiency and guarantee the pressure in the seal chamber, potential soil body potential safety hazard when avoiding emergency.

A temporary support 9 is arranged below the extension steel ring 2, and a structural bottom plate 10 is arranged below the temporary support 9; the temporary support 9 is a temporary concrete support. The included angle between the circle center of the extended steel ring 2 and two end points in contact with the temporary support 9 is R, R is 40-90 degrees, and R is preferably 50 degrees in the embodiment. When R is 50 °, the area enclosed by the temporary support 9 is small, and although time and material are saved, the overall support strength is also weak.

Although the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications, equivalents and alternatives falling within the spirit and scope of the invention.