阅读说明：本技术 一种适用于高水压条件曲线顶管接口止水结构 (Curved pipe jacking interface water stop structure suitable for high water pressure condition ) 是由 朱敏 董志超 郭晓刚 姚劲松 陈容文 罗伟 陈飞 向功兴 陈寿堂 张勇 于 2019-10-30 设计创作，主要内容包括：本发明涉及顶管工程领域,具体为一种适用于高水压条件曲线顶管接口止水结构,包括前管节和后管节,所述前管节和后管节为钢承口接口,所述前管节与后管节的端面之间设置有木衬垫,所述前管节的钢承口内侧设置有遇水膨胀橡胶,其特征在于：在后管节的插口上设置有两道止退钢环和楔形密封橡胶圈,在后管节的插口的端头附近设置有注浆管。本发明能解决高水压条件下曲线顶管接缝止水的难题,提高了顶管施工期间高水压状态下接缝止水的安全性。(The invention relates to the field of pipe jacking engineering, in particular to a water stop structure suitable for a curved pipe jacking interface under a high water pressure condition, which comprises a front pipe joint and a rear pipe joint, wherein the front pipe joint and the rear pipe joint are steel bell mouthing interfaces, a wood gasket is arranged between the end surfaces of the front pipe joint and the rear pipe joint, and water-swelling rubber is arranged on the inner side of the steel bell mouth of the front pipe joint, and the water stop structure is characterized in that: two retaining steel rings and wedge-shaped sealing rubber rings are arranged on the socket of the rear pipe joint, and a grouting pipe is arranged near the end of the socket of the rear pipe joint. The invention can solve the difficult problem of water stopping of the joint of the curved jacking pipe under the high water pressure condition and improve the safety of water stopping of the joint under the high water pressure state during the construction of the jacking pipe.)

1. The utility model provides a be applicable to curved push pipe interface stagnant water structure of high water pressure condition, includes preceding tube coupling (1) and back tube coupling (2), preceding tube coupling (1) and back tube coupling (2) are steel bell mouth interface, be provided with wooden gasket (8) between the terminal surface of preceding tube coupling (1) and back tube coupling (2), steel bell mouth (3) inboard of preceding tube coupling (1) is provided with and meets water inflation rubber (7), its characterized in that: two retaining steel rings (5) and a wedge-shaped sealing rubber ring (6) are arranged on the socket (4) of the rear pipe joint (2), and a grouting pipe (11) is arranged near the end of the socket (4) of the rear pipe joint (2).

2. The water stop structure suitable for the curved pipe jacking interface under the high water pressure condition according to claim 1, wherein the water stop structure comprises: the wedge-shaped sealing rubber ring (6) is bonded in a base groove on the socket (4) of the rear pipe joint (2) through an adhesive.

3. The water stop structure suitable for the curved pipe jacking interface under the high water pressure condition according to claim 1, wherein the water stop structure comprises: the number of the grouting pipes (11) is four.

4. The water stop structure suitable for the curved pipe jacking interface under the high water pressure condition according to claim 1, wherein the water stop structure comprises: the wood liner (8) is a plywood with uniform texture and rich elasticity, and the compression modulus is not more than 140 MPa.

5. The water stop structure suitable for the curved pipe jacking interface under the high water pressure condition according to claim 3, wherein the water stop structure comprises: after the grouting of the grouting pipe (11) is finished, the grouting pipe (11) is plugged by epoxy mortar (13) so as to improve the waterproof effect and the structural strength of the grouting hole.

6. The water stop structure suitable for the curved pipe jacking interface under the high water pressure condition according to claim 1, wherein the water stop structure comprises: the jacking pipe is provided with a slurry supplementing section at every four pipe joints along the longitudinal direction of the line, and each slurry supplementing section is provided with four grouting holes which are uniformly distributed in the middle of the jacking pipe structure.

Technical Field

The invention relates to the field of pipe jacking engineering, in particular to a curved pipe jacking interface water stopping structure suitable for high water pressure conditions.

Background

The joint water stop of the reinforced concrete roof pipe structure generally adopts a steel bell mouth or a double-socket joint, and the joint water stop needs to meet the waterproof requirements during construction and operation.

According to the technical regulations on jacking pipes for water supply and drainage projects (CECS246:2008) and the standards on jacking pipe construction technology and acceptance (trial), the reinforced concrete jacking pipe with the double-spigot interface is not suitable for sandy soil strata. When a sandy soil stratum is met, a steel bell mouth interface is mostly adopted, namely, the front half of the steel bell mouth is embedded into the concrete pipe, and a water-swelling rubber water stop ring is arranged at the position for preventing the joint surface of the steel bell mouth and the concrete pipe from leaking. After the water-swelling rubber water stop ring meets water, the volume can swell by 1-3 times, and water is stopped by the rubber ring between the front and rear jacking pipes.

In a soft soil or sandy soil stratum rich in underground water, the pipe jacking interface adopts a steel bell mouth interface with a sealing rubber ring, which is a common practice of various municipal pipe jacking projects at present, and is shown in figure 1.

Along with the rapid development of various municipal pipe jacking projects, the various municipal pipe jacking projects are buried deeper and deeper, and the requirement on water stop of pipe jacking interfaces is higher and higher. Particularly, when the water-stopping joint passes through sections such as riverways and lakes, the stratum has the characteristics of high water head, strong permeability and the like, and the water-stopping effect of the joint directly influences the success or failure of the project.

The sealing rubber ring is only required to bear the external water head function under the general condition, when the axis of the pipe jacking is a curve or the axis is required to deflect due to construction errors, the sealing rubber ring is required to bear the extrusion or the looseness caused by the deflection of the structure, and therefore the water stopping function is mainly used for the pipe jacking construction under the condition of the water head of about 10m under the general condition. When the pipe jacking project passes through sections such as rivers, lakes and the like, the pipe jacking joint needs to meet water stopping under the condition of external high-water pressure, and if the water head reaches about 35m, the water stopping of the steel socket port interface of the sealing rubber ring cannot meet the waterproof requirements of construction and operation after extrusion or relaxation.

When the external pressure-bearing water head is higher, the reliability of the water stopping effect of the sealing rubber ring is lower, and water stopping reinforcing measures need to be taken. Like utility model patent (CN203948784U), this patent adopts twice sealing rubber circle to carry out the stagnant water to set up two slip casting pipes between twice rubber circle, treat that the space that adopts grout to enclose between the sealing rubber after the push pipe completion fills closely knit, in order to reach the effect of strengthening the stagnant water.

The two sealing rubber rings can improve the water stopping capacity of the pipe jacking joint, but the existing joint water stopping structure is not suitable for curve pipe jacking construction, and the structure operation safety is low. Because the existing grouting pipe arrangement can only inject cement paste or cement mortar between two sealing rubber rings, and the anti-drag slurry cannot be injected between the push pipe and the excavated soil body, the anti-drag slurry is only provided by the head of the push pipe machine in the construction stage, when the axis of the push pipe is a curve, the push pipe thrust is greatly increased, and whether the push pipe machine can smoothly push the push pipe is directly influenced.

The gap between the pipe-jacking structure and the excavated soil body is the anti-drag slurry in the operation stage, the anti-drag slurry cannot be replaced after the construction is completed, the slurry is solidified or disturbed in the later stage, and the pipe-jacking structure is in a floating state in the slurry package during the operation period, so that the safety of the operation structure is adversely affected.

Disclosure of Invention

Aiming at the problems, the invention aims to provide a curved pipe jacking interface water stopping structure suitable for high water pressure conditions.

For realizing above-mentioned purpose, a be applicable to curved push pipe interface stagnant water structure of high water pressure condition, including preceding tube coupling and back tube coupling, preceding tube coupling and back tube coupling are the steel and hold a mouthful interface, be provided with the wooden liner between the terminal surface of preceding tube coupling and back tube coupling, the steel of preceding tube coupling holds the mouth inboard and is provided with water-swelling rubber, its characterized in that: two retaining steel rings and wedge-shaped sealing rubber rings are arranged on the socket of the rear pipe joint, and a grouting pipe is arranged near the end of the socket of the rear pipe joint.

Further, the wedge-shaped sealing rubber ring is bonded in a base groove on the socket of the rear pipe joint through an adhesive.

Further, the number of the grouting pipes is four.

Further, the wood liner is a plywood with uniform texture and rich elasticity, and the compression modulus is not more than 140 MPa.

Furthermore, after grouting of the grouting pipe is completed, the grouting pipe is plugged by epoxy mortar, so that the waterproof effect and the structural strength of the grouting hole are improved.

Furthermore, a grout supplementing section is arranged on the jacking pipe along the longitudinal direction of the line at intervals of four pipe joints, and four grouting holes which are uniformly distributed are formed in the middle of the jacking pipe structure on each grout supplementing section.

The invention has the beneficial effects that:

1. the invention can solve the difficult problem of water stopping of the joint of the curved jacking pipe under the high water pressure condition and improve the safety of water stopping of the joint under the high water pressure state during the construction of the jacking pipe.

2. The invention adopts the double-channel wedge-shaped sealing rubber ring to stop water, and under the condition that the line shape of the jacking pipe is a curve, the stress and deformation of the wedge-shaped sealing rubber ring change along with the line shape of the jacking pipe, namely the internal and external stresses of the rubber ring are uniform in a straight line section, and the internal side and the external side of the rubber ring are pressed and pulled in a curved line section.

3. Through setting up two pass wedge sealing rubber circle stagnant water, can carry out push pipe coupling joint on ground and carry out the leakproofness test, judge pipe coupling joint stagnant water performance in advance.

4. Through setting up the slip casting pipe near back tube coupling socket end to fill closely with the space between the push pipe structure and the excavation soil body, the later stage settlement volume of the soil body after reducible push pipe passed can play the effect of cutting off the hydraulic power contact between peripheral groundwater and the structure simultaneously, treats that the whole line link up the back, replaces the drag reduction mud in the structure outside for grout through the slip casting hole.

Drawings

Fig. 1 is a schematic view of a steel socket with a sealing rubber ring adopted in an existing pipe jacking interface, and the arrow direction is the pipe jacking direction.

Fig. 2 is a schematic view of a water stopping structure of a curved pipe jacking interface applicable to high water pressure conditions, wherein the arrow direction is the push pipe pushing direction.

FIG. 3 is a schematic view of the installation of the retaining steel ring of the present invention.

Fig. 4 is a schematic view of a seal test for the present invention.

Wherein: the pipe joint comprises a front pipe joint 1, a rear pipe joint 2, a steel bell 3, a socket 4, a non-return steel ring 5, a wedge-shaped sealing rubber ring 6, water-swelling rubber 7, a wood gasket 8, sealing paste 9, bell anchor bars 10, a grouting pipe 11, a steel ring 12, epoxy mortar 13, a quarter ball valve 14, a quarter pipe 15, reinforcing ribs 16, a stress main rib 17 and a pipe joint wall thickness h.

Detailed Description

The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

As shown in fig. 2, a be applicable to high water pressure condition curve push pipe interface stagnant water structure, including preceding tube coupling 1 and back tube coupling 2, preceding tube coupling 1 and back tube coupling 2 are steel and hold a mouthful interface, be provided with wooden gasket 8 between the terminal surface of preceding tube coupling 1 and back tube coupling 2, the steel of preceding tube coupling 1 holds a mouthful 3 inboard and is provided with water-swelling rubber 7, is provided with twice stopping steel ring 5 and wedge sealing rubber circle 6 on the socket 4 of back tube coupling 2, is provided with slip casting pipe 11 near the end of socket 4 of back tube coupling 2.

As shown in fig. 3, before installing the wedge-shaped sealing rubber ring 6, the retaining steel ring 5 is welded with the bellmouth anchor bar 10, the retaining steel ring 5 is synchronously embedded when the pipe-jacking pipe joint reinforcement cage is manufactured, concrete is poured, after the structural strength reaches the design strength, the wedge-shaped sealing rubber ring 6 is sequentially installed to a specified position, and meanwhile, sealant is added, and the extrusion is compact after jacking.

The wedge-shaped sealing rubber ring 6 is bonded in a base groove of the socket 4 of the rear pipe joint 2 by 202 neoprene adhesive, sealant is synchronously added when the wedge-shaped sealing rubber ring 6 is installed, and the wedge-shaped sealing rubber ring is extruded and compacted after being pushed in.

The wood liner 8 is made of plywood with uniform texture and rich elasticity, the compression modulus is not more than 140MPa, and the performance meets the requirement of pipe jacking curve axis fitting.

The assembly mode of the front and rear sections of the pipe jacking structure is consistent with that of a common single-channel sealing water-stopping pipe jacking structure.

The requirements of the wedge-shaped sealing rubber ring 6 and the wood gasket 8 are that the fitting of a plane curve or a longitudinal section curve is realized through the axis deflection between two pipe joints according to the requirement of the design axis of the plane or the longitudinal section of the jacking pipe besides the assembly of the common straight-line-section pipe joints.

Before the pipe joint and the sealing device are produced in a large scale, a sealing test is carried out on the joint of the pipe joint of the jacking pipe. As shown in figure 4, after two sections of ordinary straight-line section pipe sections are assembled in a trial mode, two small and large holes with the diameter of 8mm are formed in the steel bearing port 2 outside the double-channel wedge-shaped sealing rubber ring 6, and valves are installed on the two holes. Filling water from one hole, and opening a valve of the other hole to exhaust until the water fills the gap between the two seals; after the gap is filled with water, a pressure gauge and a pressure test pump are respectively arranged on the two holes, the pressure is applied through the pressure test pump, and when the seal leaks, the numerical value of the pressure gauge is observed. The test pressure is qualified when the test pressure reaches more than 1.5-2.0 times of the design water head. The test of the two sections of curve section pipe sections requires the same straight line section.

And four grouting holes of the rear pipe joint 2 are used for synchronously grouting the tail end of the pipe jacking machine head, so that the whole gap can be continuously filled with the grout. A slurry supplementing section is arranged in the whole pipeline at intervals of four pipe joints, and each slurry supplementing section is provided with four grouting holes. The slurry supplement is carried out sequentially and quantitatively.

Grout needs to be backfilled outside the structure so as to fill and compact gaps between the pipe-jacking structure and the excavated soil body, the later-stage settlement of the soil body after the pipe jacking can be reduced, especially, the pressure-supplementing grouting is particularly important when the pipe jacking passes through underground pipelines and embankments, water burst and soft soil sections, and the hydraulic connection between peripheral underground water and the structure can be cut off.

The slurry for backfill grouting is cement slurry, and the grouting pressure is 0.8-1.0 MPa. And (3) grouting needs to be carried out by a specially-assigned person, the pressing-in position, the pressing-in amount and the pressure value are recorded in detail, and the construction quality of the grouting process is ensured by timely adjusting according to stratum deformation monitoring information. In order to replace the resistance-reducing mud into the cement slurry as much as possible, the longitudinal partition of the pipe-jacking structure is replaced.

In the process of pipe-jacking tunneling, the rear pipe joint 2 is sequentially jacked into the front pipe joint 1, and after the whole line is communicated, the anti-drag slurry outside the structure is replaced by cement slurry through the grouting holes.

Details not described in this specification are within the skill of the art that are well known to those skilled in the art.