CN111172968B - Waterproof construction method of channel type cutting assembly type underground continuous wall - Google Patents
Waterproof construction method of channel type cutting assembly type underground continuous wall Download PDFInfo
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- CN111172968B CN111172968B CN202010021980.9A CN202010021980A CN111172968B CN 111172968 B CN111172968 B CN 111172968B CN 202010021980 A CN202010021980 A CN 202010021980A CN 111172968 B CN111172968 B CN 111172968B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/10—Prefabricated parts, e.g. composite sheet piles made of concrete or reinforced concrete
- E02D5/12—Locking forms; Edge joints; Pile crossings; Branch pieces
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
- E02D19/185—Joints between sheets constituting the sealing aprons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/14—Sealing joints between adjacent sheet piles
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- General Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
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- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention relates to a waterproof construction method of a canal type cutting assembly type underground continuous wall, which comprises the following steps: prefabricating a prefabricated slab of a concrete structure; covering waterproof boards on two sides of the thickness direction of the prefabricated board and arranging three waterproof strips extending along the length direction of the prefabricated board on one side provided with a connecting clamp; manufacturing a ground connection wall mounting groove, and injecting cement slurry into the ground connection wall mounting groove; and hoisting the precast slabs to the installation grooves of the underground diaphragm walls to assemble the inner cores. The invention provides a waterproof construction method of a channel type cutting assembly type underground continuous wall, which has a good waterproof effect and can reduce the construction period, and solves the problem that the existing channel type cutting cement-soil continuous wall which can reduce the construction period has a poor waterproof effect.
Description
Technical Field
The invention relates to the field of constructional engineering, in particular to a waterproof construction method of a channel type cutting assembly type underground continuous wall.
Background
Before excavation of a foundation pit in an underground space, a building enclosure is generally designed and constructed around the foundation pit. According to a plurality of related documents and engineering examples, the common foundation pit enclosure structure comprises cement soil mixing piles, channel type cutting cement soil walls, reinforced concrete underground continuous walls and the like to form a foundation pit enclosure body for retaining water and soil. However, in summary, the form of the building envelope needs to design a rigid pile for retaining soil and a cement-soil pile for stopping water, so that the space occupation is large in the actual construction process. With the development of the technology, the channel type cement-soil continuous wall cutting technology is formed, and the method has the advantages of small occupied space, short construction period, environmental friendliness and the like.
However, the existing trench type cement continuous wall cutting technology has the following defects: only has the function of a waterproof curtain and bears partial waterproof effect, thereby easily generating leakage.
Disclosure of Invention
The invention provides a waterproof construction method of a channel type cutting assembly type underground continuous wall, which has a good waterproof effect and can reduce the construction period, and solves the problem that the existing channel type cutting cement-soil continuous wall which can reduce the construction period has a poor waterproof effect.
The technical problem is solved by the following technical scheme: a waterproof construction method of a channel type cutting assembly type underground continuous wall is characterized by comprising the following steps:
A. the prefabricated slab of the prefabricated concrete structure, one side of width direction of said prefabricated slab made has connecting neck, another end has connecting dop;
B. the two sides of the prefabricated plate in the thickness direction are covered with waterproof plates, three waterproof strips extending along the length direction of the prefabricated plate are arranged on one side of the prefabricated plate, which is provided with a connecting clamping head, two waterproof strips in the 3 waterproof strips are positioned on the two sides of the connecting clamping head, and the other waterproof strip is positioned on one side, which is far away from the prefabricated plate, of the connecting clamping head;
C. forming a ground connection wall mounting groove on the ground where the continuous wall needs to be arranged, and injecting cement slurry into the ground connection wall mounting groove;
D. the prefabricated slab is hoisted to the inner core assembled in the underground diaphragm wall mounting groove, the connecting clamping head between two adjacent prefabricated slabs penetrates through the other prefabricated slab and is arranged in the connecting clamping groove, the waterproof strip connects the joints of the adjacent prefabricated slabs together in a sealing manner to perform waterproof sealing once, cement paste is solidified to form an outer layer covering the inner core, and the outer layer plays a role in improving the waterproof performance and the strength of the underground diaphragm wall. The waterproof effect is good, can shorten construction cycle.
Preferably, the waterproof strip is made of expanded rubber. The sealing effect can be improved.
Preferably, the precast slab is composed of a plurality of sections distributed along the length direction, and through holes extending along the length direction of the precast slab are arranged on the sections; d, after the upper and lower sections are overlapped together, injecting cement slurry into the through hole, so that the cement slurry can penetrate between the upper and lower sections, and the upper and lower sections are adhered together to enhance the waterproof effect of the joint of the upper and lower sections; the grout hardens in the through-hole and forms the reinforcing core thereby plays the effect that improves the joint strength between upper and lower segmentation. The waterproof effect of the joint when the upper and lower sections are formed can be improved.
Preferably, in the process of assembling adjacent prefabricated plates together, the prefabricated plates are folded through the through holes to extrude the waterproof strips, and the folding action of the prefabricated plates is released after cement slurry is hardened. Reliable sealing can be conveniently performed. The construction is convenient.
Preferably, when the segments are assembled, the segments are hung by penetrating steel bar lifting ropes into the through holes, the through holes are designed such that the opening areas of the through holes gradually decrease from top to bottom, the lower ends of the steel bar lifting ropes are provided with hanging heads capable of being clamped on the lower end faces of the segments, the lower end faces of the hanging heads are provided with threaded holes, the upper ends of the steel bar lifting ropes are provided with lifting rings capable of being accommodated in the upper ends of the through holes, and the upper sides of the lifting rings are provided with threaded heads; the steel bar lifting rope is arranged in the through hole in a penetrating mode, the suspension head is clamped on the lower end face of the subsection to lift the subsection, when the upper subsection and the lower subsection are aligned, the thread head for lifting the subsection steel bar lifting rope located below is in threaded connection with the thread hole for lifting the subsection steel bar lifting rope located above, then the subsection located above is placed on the subsection located below, and the suspension head and the suspension ring are located in the through hole of the subsection located below, so that the steel bar lifting rope forms a rib of the reinforcing rib. Thereby playing the role of improving the strength of the cement reinforcing rib. Construction is convenient, and the construction tool can be used as a component of the underground diaphragm wall.
Preferably, in the step a, one end of the connecting clamp head exceeds one end of the precast slab along the length direction of the precast slab, the other end of the precast slab exceeds the other end of the connecting clamp head, and one end of the connecting clamp head exceeding the precast slab faces downwards during assembling and segmenting. The convenience when inserting the connection dop into the connection clamping groove can be improved. The alignment above the connecting clamping head and the connecting clamping groove can be conveniently known. The underground diaphragm wall is convenient to assemble when being formed by a plurality of sections which are distributed up and down.
Preferably, the cement slurry in the step C is water, cement, silty clay, lime and fly ash in a weight ratio of 12%: 10%: 59%: 4%: 15% of the above-mentioned materials. The waterproof effect can be improved.
Preferably, the surface of the precast slab is covered with water in the step A for curing, and the water temperature is kept between 20 and 25 degrees. The produced prefabricated panel can be made to have less cracks, so that waterproofing can be more reliably achieved.
The invention has the following beneficial effects: waterproof layers on two sides of the precast slab are made of double-sided adhesive pre-laid coiled materials, the precast slab is fixed on two sides of the sheet piles by a mechanical fixing method, splicing seams between the concrete sheet piles are reinforced by water-swelling rubber water stop strips, and the cement soil is made to be compact in structure by adding fly ash and lime into the cement soil, so that the impermeability of a soil body is improved, the water-stopping capacity of the splicing seams between adjacent wall sheet pile components is good, and the construction period can be shortened by prefabricating and cast-in-place construction; the underground continuous wall of construction department has stagnant water effect and two main functions of soil retaining effect concurrently, and the work progress is less to the surrounding environment disturbance.
Drawings
FIG. 1 is a schematic top view of a trench-cut fabricated underground diaphragm wall made in accordance with the present invention.
Fig. 2 is a schematic diagram of the assembly of the upper and lower segments.
In the figure: the prefabricated steel plate comprises an inner core 1, an outer layer 2, a prefabricated plate 3, a connecting clamping groove 4, a connecting clamping head 5, a waterproof plate 6, a waterproof strip 7, a subsection 8, a through hole 9, a steel bar lifting rope 10, a suspension head 11, a threaded hole 12, a lifting ring 13 and a threaded head 14.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1 and 2, a trench cut fabricated underground diaphragm wall structure includes an inner core 1 of a reinforced concrete structure and an outer layer 2 for anti-infiltration covering the outer core. The inner core is a prefabricated member. The outer layer is formed by cast-in-place construction at the position of the continuous wall. The core comprises a plurality of prefabricated panels 3 (2 schematically shown in fig. 1) extending vertically in a horizontal direction. One side of the precast slab in the width direction is provided with a connecting clamping groove 4, and the other end is provided with a connecting clamping head 5. The connecting clamping groove is a circular groove. The cross section of the connecting clamping head is circular. Both sides of the thickness direction of the prefabricated plate are covered with waterproof sheets 6. The waterproof plate is positioned between the outer layer and the prefabricated member; two adjacent prefabricated plates are connected together in a sealing mode through three waterproof strips 7, a connecting clamping head of one prefabricated plate penetrates through the connecting clamping groove of the other prefabricated plate, and the connecting clamping groove and the connecting clamping head are in interference fit. Two waterproof strips in 3 waterproof strips are positioned on two sides of the connecting clamping head, and the other waterproof strip is positioned between the connecting clamping head and the connecting clamping groove. The waterproof strip is made of expanded rubber. The lower end of the connecting clamping head exceeds the lower end of the precast slab along the length direction of the precast slab, namely the up-down direction. The upper end of the precast slab exceeds the upper end of the connecting clamping head. The prefabricated panel is composed of several segments 8 (2 segments are schematically shown in fig. 2) distributed in the up-down direction. A plurality of through holes 9 extending along the length direction of the prefabricated plate are arranged in the subsections, and waterproof layers formed by solidifying injected waterproof materials are arranged between adjacent subsections. The through holes between the segments are aligned, the reinforced cores made of cement soil are poured in the segments, and the reinforced cores between the adjacent segments are integrally formed together. The waterproof layer and the reinforcing core are integrally formed together. And a steel bar lifting rope 10 used for hoisting the segments is arranged in the inner core. The opening area of the through hole is gradually reduced from top to bottom. The lower end of the steel bar lifting rope is provided with a suspension head 11 clamped on the lower end face of the segment, and the lower end face of the suspension head is provided with a threaded hole 12. The suspension head can be inserted into the upper end of the through hole. The upper end of reinforcing steel bar lifting rope is equipped with rings 13 that can the holding in the upper end of through-hole, falls the segmentation in rings through the hook during the use. The upper side of the hanging ring is provided with a screw head 14; and between the adjacent sections, the thread head of the steel bar lifting rope positioned below is in threaded connection with the thread hole of the steel bar lifting rope positioned above.
The concrete process of the waterproof construction method for manufacturing the canal cutting assembled underground continuous wall of the canal cutting assembled underground continuous wall structure comprises the following steps: the method comprises the following steps:
A. a connecting clamping groove is formed in one side of the manufactured precast slab in the width direction, and a connecting clamping head is arranged at the other end of the precast slab of the precast concrete structure. The lower end of the connecting clamping head exceeds the lower end of the prefabricated plate along the length direction of the prefabricated plate, the upper end of the prefabricated plate in the length direction exceeds the upper end of the connecting clamping head, and one end of the connecting clamping head exceeding the prefabricated plate faces downwards during assembling and segmenting. When the precast slabs are precast, water is covered on the surfaces of the precast slabs for curing, and the water temperature is kept between 20 and 25 degrees. The prefabricated plate is composed of a plurality of subsections distributed along the length direction, and through holes extending along the length direction of the prefabricated plate are arranged on the subsections. When assembled together, the segments are distributed in the up-and-down direction.
B. The prefabricated plate is characterized in that waterproof plates are covered on two sides of the prefabricated plate in the thickness direction, three waterproof strips extending along the length direction of the prefabricated plate are arranged on one side of the prefabricated plate, which is provided with a connecting clamping head, two waterproof strips in the 3 waterproof strips are located on two sides of the connecting clamping head, and the other waterproof strip is located on one side, far away from the prefabricated plate, of the connecting clamping head. The waterproof strip is made of expanded rubber. Specifically, the method comprises the following steps: after the surfaces of the prefabricated plates in the width direction are cleaned up, a moisture insulating agent is smeared, then waterproof coiled materials are adhered to the surfaces of two sides of the prefabricated plates in the width direction, the waterproof coiled materials are fixed on the surfaces, and the effective lap joint width of two adjacent coiled materials is 10 cm. The waterproof strip is formed by smearing waterproof glue.
C. And forming a ground connecting wall mounting groove on the ground where the continuous wall needs to be arranged, and injecting cement slurry into the ground connecting wall mounting groove. The cement paste is water, cement, silty clay, lime and fly ash according to the weight ratio of 12%: 10%: 59%: 4%: 15% of the above-mentioned materials.
D. The prefabricated plates are hoisted to the inner core assembled in the underground diaphragm wall mounting groove, the connecting clamping head penetrates through the two adjacent prefabricated plates to be arranged in the connecting clamping groove of the other prefabricated plate, the waterproof strips are used for connecting the joints of the adjacent prefabricated plates together in a sealing manner to realize one-time waterproof sealing, cement paste is solidified to form an outer layer covering the inner core, and the outer layer plays a role in improving the waterproof performance and the strength of the underground diaphragm wall. Specifically, the lowest subsection of the precast slab is hoisted into the underground diaphragm wall mounting groove through a steel bar hoisting rope, and cement paste is output from the upper end of the lowest subsection at the moment. The adjacent subsections are assembled in the connecting clamping grooves through the connecting clamping heads, and the lower ends of the connecting clamping heads exceed the subsections where the connecting clamping heads are located, so that whether the subsections are aligned with the connecting clamping grooves can be conveniently observed. The force is applied through the through holes, so that the lowermost section is folded to extrude the waterproof strip. Then hoisting the subsections of the next lower layer to the subsections of the lowest layer and splicing the subsections together. In the assembling process, the threaded head for hoisting the segmented steel bar lifting rope positioned below is in threaded connection with the threaded hole for hoisting the segmented steel bar lifting rope positioned above, then the segmented steel bar lifting rope positioned above is placed on the segmented steel bar lifting rope positioned below, and the suspension head and the suspension ring are both positioned in the through hole of the segmented steel bar lifting rope positioned below. Injecting cement slurry into the through hole, so that the cement slurry permeates into the space between the upper and lower sections and is solidified to form a waterproof layer, and the upper and lower sections are bonded together to enhance the waterproof effect at the joint of the upper and lower sections; the grout hardens in the through-hole and forms the reinforcing core thereby plays the effect that improves the joint strength between upper and lower segmentation. The reinforcing steel lifting rope forms a rib of the reinforcing rib. By observing whether cement paste flows out in the whole circumferential direction of the joint of the upper and lower sections, if so, the upper and lower butt joint parts are filled with the cement paste, and then the cement paste is continuously injected into the underground diaphragm wall mounting groove to a position 15 cm away from the upper end of the section below the next lower part. And then assembling the rest segments in the process.
Claims (5)
1. A waterproof construction method of a channel type cutting assembly type underground continuous wall is characterized by comprising the following steps:
A. the prefabricated slab of the prefabricated concrete structure, one side of width direction of said prefabricated slab made has connecting neck, another end has connecting dop;
B. the two sides of the prefabricated plate in the thickness direction are covered with waterproof plates, three waterproof strips extending along the length direction of the prefabricated plate are arranged on one side of the prefabricated plate, which is provided with a connecting clamping head, two waterproof strips in the three waterproof strips are positioned on the two sides of the connecting C and the clamping head, and the other waterproof strip is positioned on one side of the connecting clamping head, which is far away from the prefabricated plate;
D. forming a ground connection wall mounting groove on the ground where the continuous wall needs to be arranged, and injecting cement slurry into the ground connection wall mounting groove;
hoisting the precast slabs to the underground diaphragm wall mounting groove to assemble an inner core, wherein two adjacent precast slabs are arranged in the connecting clamping groove of the other precast slab in a penetrating manner through the connecting clamping head of one precast slab, the waterproof strip connects the joints of the adjacent precast slabs together in a sealing manner to perform waterproof sealing for one time, and cement paste is cured to form a waterproof outer layer covered on the inner core; the prefabricated slab is composed of a plurality of sections distributed along the length direction, and through holes extending along the length direction of the prefabricated slab are arranged on the sections; d, after the upper and lower sections are overlapped together, injecting cement slurry into the through hole, so that the cement slurry can penetrate between the upper and lower sections, and the upper and lower sections are adhered together to enhance the waterproof effect of the joint of the upper and lower sections; the cement paste is hardened in the through hole to form a reinforcing core, so that the effect of improving the connection strength between the upper section and the lower section is achieved; when the sections are assembled, a steel bar lifting rope penetrates through the through hole to be lifted, the through hole is designed such that the opening area is gradually reduced from top to bottom, a hanging head capable of being clamped on the lower end face of each section is arranged at the lower end face of each steel bar lifting rope, a threaded hole is formed in the lower end face of each hanging head, a lifting ring capable of being contained in the upper end of each through hole is arranged at the upper end of each steel bar lifting rope, and a threaded head is arranged on the upper side of each lifting ring; the steel bar lifting rope is arranged in the through hole in a penetrating mode, the suspension head is clamped on the lower end face of the subsection to lift the subsection, when the upper subsection and the lower subsection are aligned, the threaded head of the segmented steel bar lifting rope below is connected with the threaded hole of the segmented steel bar lifting rope above, then the subsection above is placed on the subsection below, and the suspension head and the suspension ring are located in the through hole of the subsection below, so that the steel bar lifting rope and cement paste jointly form a rib of the cement reinforcing rib, and the effect of improving the strength of the cement reinforcing rib is achieved.
2. The method of waterproofing a trench cut fabricated underground diaphragm wall according to claim 1, wherein the waterproofing strip is pressed by the prefabricated panels being closed by the force applied through the through-holes while the adjacent prefabricated panels are assembled together.
3. The method of waterproofing a trench cut fabricated underground diaphragm wall according to claim 1, wherein in the step a, one end of the connection clip is made to protrude beyond one end of the prefabricated slab in the length direction of the prefabricated slab, the other end of the prefabricated slab in the length direction thereof is made to protrude beyond the other end of the connection clip, and the convenience in inserting the connection clip into the connection clip groove can be improved by making the one end of the connection clip which protrudes beyond the prefabricated slab face downward at the time of assembling the segments.
4. The waterproof construction method of a trench cutting fabricated underground diaphragm wall according to claim 1, wherein the cement slurry in step C is water, cement, silty clay, lime and fly ash in a weight ratio of 12%: 10%: 59%: 4%: 15% of the above-mentioned materials.
5. The method of waterproofing a trench cut fabricated underground diaphragm wall according to claim 1, wherein the curing is performed by covering water on the surface of the prefabricated slab in step a, and the water temperature is maintained between 20 ° and 25 °.
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| CN202010021980.9A CN111172968B (en) | 2020-01-09 | 2020-01-09 | Waterproof construction method of channel type cutting assembly type underground continuous wall |
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| CN202010021980.9A CN111172968B (en) | 2020-01-09 | 2020-01-09 | Waterproof construction method of channel type cutting assembly type underground continuous wall |
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Citations (5)
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|---|---|---|---|---|
| KR20130081971A (en) * | 2012-01-10 | 2013-07-18 | 백인우 | Precast concrete wall and method for constructing underground permanent wall using the precast concrete wall |
| CN109056703A (en) * | 2018-09-17 | 2018-12-21 | 中国铁路设计集团有限公司 | A kind of construction method of assembled underground continuous wall |
| CN109281313A (en) * | 2018-09-27 | 2019-01-29 | 广州地铁设计研究院股份有限公司 | A kind of Prefabricated composite box diaphram wall and its construction method |
| CN109577314A (en) * | 2018-11-22 | 2019-04-05 | 浙江吉通地空建筑科技有限公司 | Canal formula soil cement interpolation assembled underground connects wall prestressing force wallboard |
| CN109653191A (en) * | 2018-12-12 | 2019-04-19 | 山东大学 | Prefabricated PC continuous underground wall structure and its construction method |
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2020
- 2020-01-09 CN CN202010021980.9A patent/CN111172968B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130081971A (en) * | 2012-01-10 | 2013-07-18 | 백인우 | Precast concrete wall and method for constructing underground permanent wall using the precast concrete wall |
| CN109056703A (en) * | 2018-09-17 | 2018-12-21 | 中国铁路设计集团有限公司 | A kind of construction method of assembled underground continuous wall |
| CN109281313A (en) * | 2018-09-27 | 2019-01-29 | 广州地铁设计研究院股份有限公司 | A kind of Prefabricated composite box diaphram wall and its construction method |
| CN109577314A (en) * | 2018-11-22 | 2019-04-05 | 浙江吉通地空建筑科技有限公司 | Canal formula soil cement interpolation assembled underground connects wall prestressing force wallboard |
| CN109653191A (en) * | 2018-12-12 | 2019-04-19 | 山东大学 | Prefabricated PC continuous underground wall structure and its construction method |
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Application publication date: 20200519 Assignee: Zhejiang Xinguan Construction Group Co.,Ltd. Assignor: ZHEJIANG SCI-TECH University Contract record no.: X2022330000455 Denomination of invention: Waterproof construction method of canal cut and assembled underground diaphragm wall Granted publication date: 20210921 License type: Common License Record date: 20220825 Application publication date: 20200519 Assignee: ZHEJIANG JINGCHANG CONSTRUCTION Co.,Ltd. Assignor: ZHEJIANG SCI-TECH University Contract record no.: X2022330000454 Denomination of invention: Waterproof construction method of canal cut and assembled underground diaphragm wall Granted publication date: 20210921 License type: Common License Record date: 20220825 Application publication date: 20200519 Assignee: Zhejiang Jiangxin Construction Co.,Ltd. Assignor: ZHEJIANG SCI-TECH University Contract record no.: X2022330000456 Denomination of invention: Waterproof construction method of canal cut and assembled underground diaphragm wall Granted publication date: 20210921 License type: Common License Record date: 20220825 |