CN215564685U - A connection structure for underground connection engineering - Google Patents
A connection structure for underground connection engineering Download PDFInfo
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- CN215564685U CN215564685U CN202121308012.2U CN202121308012U CN215564685U CN 215564685 U CN215564685 U CN 215564685U CN 202121308012 U CN202121308012 U CN 202121308012U CN 215564685 U CN215564685 U CN 215564685U
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Abstract
本实用新型提供了一种地下接建工程连接结构。包括新混凝土体和旧混凝土体；所述新混凝土体与旧混凝土体之间形成折线式接缝，所述折线式接缝中设有界面剂层和多个止水条；所述新混凝土体和旧混凝土体的迎水侧设有基底防水层。本实用新型通过在新混凝土体和旧混凝土体的连接界面形成折线式接缝，延长了地下高压水的渗漏路径，在折线式接缝中设置界面剂层和止水条，同时在新混凝土体和旧混凝土体迎水侧设置基底防水层，形成多级防水结构，确保新、旧混凝土体的连接部位能够抵抗高压地下水的渗漏。
The utility model provides a connection structure for an underground connection construction project. It includes a new concrete body and an old concrete body; a broken line joint is formed between the new concrete body and the old concrete body, and an interface agent layer and a plurality of water stop strips are arranged in the broken line joint; the new concrete body And the water-facing side of the old concrete body is provided with a base waterproof layer. The utility model extends the leakage path of underground high-pressure water by forming a broken line joint at the connection interface of the new concrete body and the old concrete body. The base waterproof layer is set on the water-facing side of the concrete body and the old concrete body to form a multi-level waterproof structure to ensure that the connection parts of the new and old concrete bodies can resist the leakage of high-pressure groundwater.
Description
Technical Field
The utility model relates to the technical field of concrete construction, in particular to a connecting structure of underground construction projects.
Background
In the underground construction project, the joint part between the new concrete and the old concrete has the advantages that due to the structural form and the material discontinuity of the new concrete and the old concrete, the strength of the connecting interface of the new concrete and the old concrete is reduced, microcracks are easy to generate under the high-water-pressure environment, and further the leakage problem of an underground structure is caused, the existing joint waterproof structure mostly adopts a single waterproof scheme to carry out waterproof, and if a water stop strip is arranged on the connecting interface, the waterproof requirement cannot be met; and once the leakage problem of the underground structure occurs in the operation period, large-area reworking is needed, and effective rush repair and leakage stoppage are difficult to perform in time.
In summary, there is a need for a connection structure for underground construction engineering to solve the problems in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an underground construction project connecting structure to solve the problem that a new concrete connecting interface and an old concrete connecting interface are easy to leak under the action of high-pressure water.
In order to achieve the above object, the present invention provides a connecting structure for underground construction works, comprising a new concrete body and an old concrete body; a broken line type joint is formed between the new concrete body and the old concrete body, and an interface agent layer and a plurality of water stop strips are arranged in the broken line type joint; and the water facing sides of the new concrete body and the old concrete body are provided with a substrate waterproof layer.
Preferably, the broken line seam comprises at least one stepped seam; the stepped seam is formed by connecting a plurality of sections of vertical seams and horizontal seams; and water stop strips are arranged in the vertical joint and the horizontal joint.
Preferably, the interface agent layer is made of a cement-based permeable crystallization type waterproof coating or cement paste mixed with an expanding agent.
Preferably, the new concrete body is made of self-compacting concrete.
Preferably, the basement waterproof layer is including the concrete bed course, waterproof roll material layer and the protective layer that set gradually, wherein, the concrete bed course is located the one side of keeping away from new concrete body and old concrete body.
Preferably, a wedge-shaped cavity for accommodating a water stop belt is arranged between the waterproof roll material layer and the protective layer.
Preferably, the waterproof roll material layer is made of a high-molecular self-adhesive film or thermoplastic polyolefin.
Preferably, the underground construction project connecting structure further comprises a grouting pipe arranged inside the new concrete body; one end of the grouting pipe is connected with grouting equipment, and the other end of the grouting pipe is communicated with the broken line type seam.
Preferably, waterproof rubber is arranged at one end of the grouting pipe connected with grouting equipment.
Preferably, the water-proof layer for covering the broken line type seam joint is arranged on the backwater side of the new concrete body and the old concrete body.
The technical scheme of the utility model has the following beneficial effects:
(1) according to the utility model, the broken-line type seam is formed on the connecting interface of the new concrete body and the old concrete body, so that the leakage path of underground high-pressure water is prolonged, the interface agent layer and the water stop strip are arranged in the broken-line type seam, and the base waterproof layer is arranged on the water facing side of the new concrete body and the old concrete body, so that a multi-stage waterproof structure is formed, and the connecting parts of the new concrete body and the old concrete body can resist the leakage of high-pressure underground water.
(2) According to the utility model, the interface agent layer is coated on the connecting interface of the new concrete body and the old concrete body, and the physical and chemical actions between the active chemical substances in the interface agent layer and the concrete are utilized to block the gap between the connecting interfaces of the concrete, so that the connecting part (namely the broken line type seam 3) has the characteristic of self-repairing and healing, and the compactness and the mechanical property of the connecting part are improved.
(3) According to the utility model, the water stop strips are arranged in the broken line type seams, irregular surfaces, cavities and gaps in the broken line type seams are filled through the expansion deformation of the water stop strips, and meanwhile, huge contact pressure is generated, so that the leakage of underground water in the broken line type seams is thoroughly prevented.
(4) According to the utility model, the base waterproof layer comprises a concrete cushion layer, a waterproof roll material layer and a protective layer which are arranged in a stacked mode, underground water is prevented from entering a connecting part between a new concrete body and an old concrete body from a water-facing side, a wedge-shaped cavity for containing a water stop belt is arranged between the waterproof roll material layer and the protective layer, the water stop belt is located right below a joint of the new concrete body and the old concrete body, and the waterproof effect is enhanced.
(5) In the utility model, the grouting pipe is embedded in the new concrete body, so that high-pressure grout can be conveniently injected into the joint parts (namely the broken line type joints) of the new concrete body and the old concrete body during operation, and the leakage gaps of the joint parts are filled; and meanwhile, the waterproof layer is coated again, so that secondary waterproof repair construction under a small disturbance condition is realized.
(6) The utility model has simple connecting structure, and has the characteristics of strong impermeability and easy maintenance under the condition that the manufacturing cost is close to the manufacturing cost of the conventional connecting structure.
(7) The connection structure provided by the utility model is not only suitable for underground construction projects, but also suitable for underground construction joints, post-cast strips and other parts under the condition of water-rich strata.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the utility model and, together with the description, serve to explain the utility model and not to limit the utility model. In the drawings:
fig. 1 is a schematic structural diagram of a connection structure of an underground construction project in an embodiment of the present application;
FIG. 2 is an enlarged detail view of portion A in FIG. 1 according to an embodiment of the present application;
the concrete waterproof structure comprises 1, a new concrete body, 2, an old concrete body, 3, a broken line type joint, 3.1, an interface agent layer, 3.2, a water stop strip, 3.3, a step type joint, 4, a substrate waterproof layer, 4.1, a concrete cushion layer, 4.2, a waterproof roll material layer, 4.3, a water stop belt, 4.4, a protective layer, 5, a grouting pipe, 5.1, waterproof rubber, 6 and a waterproof layer.
Detailed Description
Embodiments of the utility model will be described in detail below with reference to the drawings, but the utility model can be implemented in many different ways, which are defined and covered by the claims.
Example (b):
referring to fig. 1 to 2, the present embodiment is applied to waterproofing of a connection part of an underground construction project.
A connecting structure of underground construction projects comprises a new concrete body 1 and an old concrete body 2; a broken line type seam 3 is formed between the new concrete body 1 and the old concrete body 2 to prolong the underground water leakage path; an interface agent layer 3.1 and a plurality of water stop strips 3.2 are arranged in the broken-line type seam 3 to realize the filling and water prevention of the broken-line type seam 3; the water-facing sides of the new concrete body 1 and the old concrete body 2 are provided with a base waterproof layer 4 for preventing high-pressure groundwater from leaking from the water-facing side to the water-backing side along a leakage path (i.e., a broken-line type joint 3 between the new concrete body 1 and the old concrete body 2), as shown in fig. 1.
The broken line seam 3 comprises at least one stepped seam 3.3; the stepped seam 3.3 is formed by connecting a plurality of sections of vertical seams and horizontal seams; and water stop strips 3.2 are arranged in the vertical joint and the horizontal joint and used for blocking the leakage of high-pressure underground water. In this embodiment, the broken seam 3 includes a step seam 3.3 for combining with the water stop strip 3.2 to form a step-shaped water-blocking structure. In this embodiment, sealing rod 3.2 adopts the cross-section to be 20mm 30 mm's water-swelling sealing rod, adopts water-swelling rubber to make, and this kind of rubber can produce 2 ~ 3 times after the water-logging inflation deformation to be full of irregular surface, hole and the clearance in the broken line formula seam 3, produce huge contact pressure simultaneously, thoroughly prevent the seepage in the broken line formula seam 3.
The interface agent layer 3.1 filled in the broken-line type joint 3 is made of one of cement-based permeable crystalline waterproof paint or cement paste mixed with an expanding agent, and before the interface agent layer 3.1 is coated, the connecting interface of the old concrete body 2 needs to be sprayed and aired; then, chiseling the connecting interface of the old concrete body 2, and reserving an installation groove of the water stop strip 3.2; and finally, coating an interface agent on the connecting interface, and blocking gaps existing between the concrete connecting interfaces through the physical and chemical action between active substances in the interface agent and concrete, so that the connecting part (namely the broken line type seam 3) has the characteristic of self-repairing healing, and the compactness and the mechanical property of the connecting part are improved. When the cement paste doped with the expanding agent is selected as the material of the interface agent layer 3.1, the cement paste which is mixed with 10 percent of U-shaped expanding agent and is consistent with the old concrete body 2 is preferred, and the painting thickness of the interface agent layer 3.1 is 0.5 mm-1.5 mm.
The new concrete body 1 is made of self-compacting concrete, the self-compacting concrete has micro-expansion performance, and 0.7% of cement-based permeable crystalline waterproof material can be doped in the self-compacting concrete for improving the impermeability of the new concrete body 1.
Referring to fig. 2, the base waterproof layer 4 includes a concrete cushion layer 4.1, a waterproof roll layer 4.2 and a protective layer 4.4, which are sequentially arranged, wherein the concrete cushion layer 4.1 is located on one side far away from the new concrete body 1 and the old concrete body 2; a wedge-shaped cavity for containing a water stop 4.3 is arranged between the waterproof roll material layer 4.2 and the protective layer 4.4, so that the water stop 4.3 is positioned right below a joint of the new concrete body 1 and the old concrete body 2, and the waterproof effect is enhanced; in this embodiment, the water stop 4.3 is a back-attached rubber water stop. After the surface cleaning work is done, the concrete cushion layer 4.1, the waterproof coil material layer 4.2, the water stop belt 4.3 and the protective layer 4.4 are laid in sequence from bottom to top; the protective layer 4.4 is laid on the water stop 4.3 and the waterproof coiled material layer 4.2 and used for protecting the rubber water stop and the waterproof coiled material; in this embodiment, protective layer 4.4 is the fine aggregate concrete protective layer, because the self-compaction concrete performance in the new concrete body 1 is better, but the new concrete body 1 of direct casting (being self-compaction concrete) is as the protective layer above waterstop 4.3, also can additionally set up protective layer 4.4 again on waterstop 4.3.
The material on waterproofing membrane layer 4.2 is one of polymer self-adhesive film or thermoplastic polyolefin, and when two adjacent waterproofing membrane overlap joints, the overlap joint length of coiled material major and minor face must not be less than 100mm, and the overlap joint position of upper and lower two-layer coiled material 1/3 ~ 1/2 range of the coiled material that should stagger, and two-layer coiled material must not mutually perpendicular shop paste, appears the gap when preventing adjacent waterproofing membrane overlap joint, influences waterproofing performance on waterproofing membrane layer 4.2.
The connecting structure of the underground construction engineering further comprises a grouting pipe 5 arranged inside the new concrete body 1; the one end and the slip casting equipment of slip casting pipe 5 are connected, the other end of slip casting pipe 5 with broken line formula seam 3 intercommunication for inject high-pressure thick liquid into broken line formula seam 3 through the slip casting pipe when operation phase waterproof maintenance, fill the seepage gap at connection position. In this embodiment, slip casting pipe 5 is L type slip casting pipe, and the one end that slip casting pipe 5 and slip casting equipment are connected is equipped with waterproof rubber 5.1, realizes sealed to slip casting pipe 5, and it can to wear through waterproof rubber 5.1 when needing the slip casting.
The backwater side of the new concrete body 1 and the old concrete body 2 is provided with a waterproof layer 6 for covering the joint of the broken line type seam 3, and a polyurethane material or a JS waterproof material and the like can be selected as the material of the waterproof layer 6.
A construction method of a connection structure of underground construction engineering comprises the following steps:
step one, crushing and dismantling the old concrete body 2: statically crushing an original structural section, excavating a wedge-shaped cavity on a waterproof layer of an original base, constructing a broken-line type connecting path at the connecting part of the old concrete body 2, and reserving an installation groove of a water stop strip 3.2 on the connecting path;
step two, constructing a base waterproof layer 4: constructing a concrete cushion 4.1, paving a waterproof roll layer 4.2, paving a water stop 4.3 in the wedge-shaped cavity, and preparing a protective layer 4.4 above the waterproof roll layer 4.2 and the water stop 4.3;
step three, construction of a broken line type joint 3: bond sealing rod 3.2 on the sealing rod 3.2 mounting groove that old concrete body 2 set up to carry out the preliminary treatment to the joint interface of pouring of old concrete body 2, including following step:
processing the connecting interface of the old concrete body 2: carrying out sand blasting or high-pressure water gun roughening treatment on the connecting interface of the old concrete body 2 to enhance the roughness of the concrete connecting interface;
secondly, water saturation treatment of the connecting interface: spraying the connecting interface of the old concrete body 2 for 24h by using a spraying device to ensure that the old concrete body 2 fully absorbs water and is in a water-saturated state, and then naturally airing the connecting interface;
③ coating the interfacial agent layer 3.1: coating an interface agent on a naturally dried connecting interface of the old concrete body 2, wherein the thickness of an interface agent layer 3.1 is 0.5-1.5 mm;
step four: pouring a new concrete body 1: pouring the new concrete body 1 by adopting self-compacting concrete;
step five: construction of a waterproof maintenance structure in an operation period: a grouting pipe 5 is pre-buried in a new concrete body 1, the diameter of the grouting pipe 5 is about 10mm, the port is sealed and filled with waterproof rubber 5.1, and when leakage occurs in the operation stage, high-pressure grouting and leakage plugging are performed after the waterproof rubber 5.1 is crushed by an electric drill and the like;
constructing a waterproof layer 6 at the interface of the broken-line type seam 3 of the new concrete body 1 and the old concrete body 2, and painting for three times, wherein the thickness of each layer of coating film is 1.5 mm; when leakage occurs in the operation stage, after the grouting pipe 5 is filled in the gap of the broken line type joint 3, the waterproof layer 6 is constructed at the joint of the broken line type joint 3 again (namely, the waterproof material is coated).
Step five: if leakage problem appears in the later operation stage, the secondary waterproof treatment is carried out through the grouting pipe 5 and the waterproof layer 6.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A connection structure for underground construction works, characterized by comprising a new concrete body (1) and an old concrete body (2); a broken line type seam (3) is formed between the new concrete body (1) and the old concrete body (2), and an interface agent layer (3.1) and a plurality of water stop strips (3.2) are arranged in the broken line type seam (3); and the water facing sides of the new concrete body (1) and the old concrete body (2) are provided with a base waterproof layer (4).
2. An underground construction work connection according to claim 1, wherein the broken-line seam (3) comprises at least one stepped seam (3.3); the stepped seam (3.3) is formed by connecting a plurality of sections of vertical seams and horizontal seams; and water stop strips (3.2) are arranged in the vertical joint and the horizontal joint.
3. The connecting structure of underground construction works according to claim 1, wherein the interface agent layer (3.1) is made of cement-based permeable crystalline waterproof paint or cement paste mixed with expanding agent.
4. A connection structure for underground works according to claim 1, characterized in that the material of said new concrete body (1) is self-compacting concrete.
5. An underground construction work connection structure according to claim 1, characterized in that the base waterproof layer (4) comprises a concrete cushion (4.1), a waterproof roll layer (4.2) and a protective layer (4.4) arranged in sequence, wherein the concrete cushion (4.1) is located on the side away from the new concrete body (1) and the old concrete body (2).
6. An underground construction work connection according to claim 5, characterised in that a wedge-shaped cavity for receiving a water stop (4.3) is provided between the waterproof roll layer (4.2) and the protective layer (4.4).
7. The connection structure of underground construction works according to claim 5, wherein the waterproof roll layer (4.2) is made of a high molecular self-adhesive film or thermoplastic polyolefin.
8. A connection structure for underground works according to claim 1, characterized by further comprising a grouting pipe (5) arranged inside the new concrete body (1); one end of the grouting pipe (5) is connected with grouting equipment, and the other end of the grouting pipe (5) is communicated with the broken line type seam (3).
9. The underground construction work connection structure according to claim 8, wherein the end of the grouting pipe (5) connected with grouting equipment is provided with waterproof rubber (5.1).
10. An underground construction work connection structure according to claim 1 or 8, characterized in that the waterline side of the new concrete body (1) and the old concrete body (2) is provided with a waterproof layer (6) for covering the joint of the broken-line seam (3).
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| CN202121308012.2U CN215564685U (en) | 2021-06-11 | 2021-06-11 | A connection structure for underground connection engineering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960767A (en) * | 2022-05-16 | 2022-08-30 | 中国一冶集团有限公司 | Advanced water-stopping reinforced structure for connecting new and old channels and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114960767A (en) * | 2022-05-16 | 2022-08-30 | 中国一冶集团有限公司 | Advanced water-stopping reinforced structure for connecting new and old channels and construction method thereof |
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