CN112609725A - Prefabricated steel open caisson construction method suitable for central urban area - Google Patents
Prefabricated steel open caisson construction method suitable for central urban area Download PDFInfo
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- CN112609725A CN112609725A CN202011437083.2A CN202011437083A CN112609725A CN 112609725 A CN112609725 A CN 112609725A CN 202011437083 A CN202011437083 A CN 202011437083A CN 112609725 A CN112609725 A CN 112609725A
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- open caisson
- prefabricated steel
- sinking
- steel open
- pressure
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
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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
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention relates to a construction method of a prefabricated steel open caisson applicable to a central city area, which comprises the following steps: firstly, pouring a circle of concrete bearing platform around the soil body at the sinking position of the prefabricated steel open caisson; arranging a plurality of counter-force anchor boxes on the concrete bearing platform; erecting a pressure-sinking steel beam above the prefabricated steel open caisson, installing and welding a pressure beam pile cap at a contact position of the pressure-sinking steel beam and the prefabricated steel open caisson wall, reserving vertical through holes at two ends of the pressure-sinking steel beam, placing a center-penetrating jack in the through holes, and arranging an anchor cable to connect the center-penetrating jack with a counter-force anchor box; and finally, jacking the penetrating jack to enable the penetrating jack to generate downward pressure on the prefabricated steel open caisson, so that the prefabricated steel open caisson is pressed to a designed position of a soil body. The invention can effectively solve the problem that the prefabricated steel open caisson is not enough to sink by self weight under the condition of meeting poor geological and hydrographic conditions, and can ensure that the steel open caisson sinks stably, shorten the construction period and control the sinking process of the open caisson by controlling the pressure sinking system.
Description
Technical Field
The invention relates to a sunk well construction method, in particular to a prefabricated steel sunk well construction method suitable for a central urban area.
Background
Open caisson is more and more extensive in underground works field application, and compared with the foundation ditch, the time limit for a project is shorter, and structural stability is better. The sinking construction method of the open caisson is closely related to hydrogeological conditions of a field and the protection requirements of surrounding environment, the traditional open caisson sinking process overcomes the friction force with the soil body through self weight and slowly sinks, the deviation rectifying difficulty is high, and the construction period is long. Compared with a concrete open caisson, the prefabricated steel open caisson has small thickness of the well wall and light dead weight, and can sink normally by relying on the dead weight under the condition of meeting the poor geological and hydrological conditions, and auxiliary measures are required to be used for ensuring that the steel open caisson can sink normally.
Disclosure of Invention
The invention aims to provide a construction method of a prefabricated steel open caisson applicable to a central urban area, which ensures that the steel open caisson can normally sink by using auxiliary measures.
In order to realize the construction purpose, the invention adopts the following scheme:
a construction method of a prefabricated steel open caisson suitable for a central city area comprises the following steps: firstly, pouring a circle of concrete bearing platform around the soil body at the sinking position of the prefabricated steel open caisson; a plurality of counterforce anchor boxes are arranged on the concrete bearing platform; erecting a pressure-sinking steel beam above the prefabricated steel open caisson, installing and welding a pressure beam pile cap at a contact position of the pressure-sinking steel beam and the prefabricated steel open caisson wall, reserving vertical through holes at two ends of the pressure-sinking steel beam, placing a center-penetrating jack in the through holes, and arranging an anchor rope to connect the center-penetrating jack with the counter-force anchor box; and finally, jacking the penetrating jack to enable the penetrating jack to generate downward pressure on the prefabricated steel open caisson, so that the prefabricated steel open caisson is pressed to a designed soil body position.
Further, the prefabricated steel open caisson is manufactured in sections and is subjected to sectional pressure sinking, a first section of steel open caisson is pressed into soil, the pressure sinking steel beam with the pressure beam pile cap is separated from the first section of prefabricated steel open caisson, the first section of prefabricated steel open caisson is erected to the upper end of a second section of open caisson, and the pressure sinking is carried out by the same method; and repeating the steps in such a circulating way, and performing pressure sinking construction on each section of the prefabricated steel open caisson to finally complete the whole open caisson construction.
Furthermore, the shape of the pile cap of the pressing beam is 'pi' shaped, and the pile cap of the pressing beam is welded with the pressing and sinking steel beam and used for increasing the contact surface between the well wall and the pressing and sinking steel beam, so that the structure of the pile cap of the pressing beam is kept stable and is not easy to damage.
Furthermore, the counter-force anchor box is fixedly connected with the concrete bearing platform through anchor bars.
Furthermore, the center line of the center-penetrating jack, the center line of the anchor cable and the center line of the counter-force anchor box are positioned on the same vertical straight line.
The invention has the beneficial effects that:
the construction method capable of effectively providing the pressure and the sinking force is provided for the prefabricated steel open caisson by utilizing the pressure and the sinking steel beams, the penetrating jacks, the anchor cables, the counter-force anchor boxes and the concrete bearing platforms, the construction method is suitable for places with strict environmental protection in central urban areas, the difficult problem that the prefabricated steel open caisson cannot sink due to dead weight under the condition of meeting the poor geological and hydrological conditions is effectively solved, the steel open caisson can sink stably through the control of a pressure and sinking system, the construction period is shortened, and the sinking process of the open caisson can be controlled. In addition, through welding the pile cap of the pressing beam, the contact surface of the well wall and the pressing and sinking steel beam is increased, the structural stability of the prefabricated steel open caisson is kept, the contact surface of the well wall and the pressing and sinking steel beam is prevented from being damaged, and the structural integrity and the stability are guaranteed to be good.
Drawings
FIG. 1 is an elevation view of the construction of a prefabricated steel open caisson of the present invention;
FIG. 2 is a top view of the construction of the prefabricated steel open caisson of the present invention;
FIG. 3 is a schematic diagram of the first section of steel open caisson in a pressed state;
FIG. 4 is a schematic diagram of the second section of steel sinking well;
FIG. 5 is a schematic view of a press beam helmet;
figure 6 is a schematic view of a crush beam.
Detailed Description
The invention is further illustrated with reference to the following figures and specific examples. These examples are given solely for the purpose of illustration and are not intended to limit the scope of the invention, which is to be given the full breadth of the present disclosure, and any variations or modifications within the skill of the art after reading the teachings herein, may be made, and such equivalents are intended to fall within the scope of the invention as defined in the claims appended hereto.
As shown in fig. 1 and 2, the prefabricated steel open caisson construction method applicable to the central urban area of the invention carries out press-sinking construction on the prefabricated steel open caisson by utilizing the synergistic action of a press-sinking steel beam 1, a press-beam pile cap 2, a penetrating jack 3, an anchor rope 4, a concrete bearing platform 5 and a counterforce anchor box 6. Pouring a circle of concrete bearing platform 5 around the soil body at the sinking position of the prefabricated steel open caisson; a plurality of counterforce anchor boxes 6 are arranged on the concrete bearing platform 5; and erecting a pressure-sinking steel beam 1 above the prefabricated steel open caisson, installing and welding a pressure beam pile cap 2 at the contact position of the pressure-sinking steel beam 1 and the prefabricated steel open caisson wall, reserving vertical through holes at two ends of the pressure-sinking steel beam 1, placing a penetrating jack 3 in the through holes, and arranging an anchor rope 4 to connect the penetrating jack 3 with a counter-force anchor box 6.
The counterforce anchor box 6 is fixedly connected with the concrete bearing platform 5 through anchor bars. The center line of the center-penetrating jack 3, the center line of the anchor cable 4 and the center line of the counter-force anchor box 6 are positioned on the same vertical straight line.
As shown in fig. 3, a pressure-sinking steel beam 1 is erected above the first section of steel open caisson, and is connected with a counterforce anchor box 6 on a concrete bearing platform 5 through an anchor cable 4, and the prefabricated steel open caisson is subjected to pressure sinking by using the jacking force provided by the penetrating jack 3, so that the first section of steel open caisson is sunk to a specified position.
As shown in fig. 4, after the first section of steel open caisson is sunk to a designated position, the crush-sinking steel beams are taken down and then installed at the upper end of the second section of open caisson, and the crush-sinking construction is carried out on the second section of steel open caisson by using the same method. Repeating the steps, and finally completing the construction of the whole prefabricated steel open caisson by pressing and sinking the multiple sections of open caisson.
As shown in fig. 5, the pressing beam pile cap 2 is formed by welding 3 steel plates, is shaped like a letter pi, is uniformly provided with rib plates at intervals according to needs, and is provided with round holes with the diameter of 30mm at two ends. Before sinking, the pile cap is welded with the open caisson and the compression beam to prevent falling.
As shown in figure 6, the pressure-sinking steel beam 1 adopts double-spliced 700X300 steel, and stiffened plates with the thickness of 10mm are additionally arranged at the midspan position, the position contacting with the well wall and the mounting position of the through jack.
Claims (5)
1. A construction method of a prefabricated steel open caisson applicable to a central urban area is characterized by comprising the following steps: firstly, pouring a circle of concrete bearing platform around the soil body at the sinking position of the prefabricated steel open caisson; a plurality of counterforce anchor boxes are arranged on the concrete bearing platform; erecting a pressure-sinking steel beam above the prefabricated steel open caisson, installing and welding a pressure beam pile cap at a contact position of the pressure-sinking steel beam and the prefabricated steel open caisson wall, reserving vertical through holes at two ends of the pressure-sinking steel beam, placing a center-penetrating jack in the through holes, and arranging an anchor rope to connect the center-penetrating jack with the counter-force anchor box; and finally, jacking the penetrating jack to enable the penetrating jack to generate downward pressure on the prefabricated steel open caisson, so that the prefabricated steel open caisson is pressed to a designed soil body position.
2. The construction method of the prefabricated steel open caisson applicable to the central urban area as claimed in claim 1, wherein the construction method comprises the following steps: the prefabricated steel open caisson is manufactured in sections and is pressed and sunk in sections, a first section of steel open caisson is pressed into soil, the press-sunk steel beam with the press beam pile cap is separated from the first section of prefabricated steel open caisson, the first section of prefabricated steel open caisson is erected to the upper end of a second section of open caisson, and the press sinking is carried out by the same method; and repeating the steps in such a circulating way, and performing pressure sinking construction on each section of the prefabricated steel open caisson to finally complete the whole open caisson construction.
3. The construction method of the prefabricated steel open caisson applicable to the central urban area as claimed in claim 1, wherein the construction method comprises the following steps: the pile cap of the pressing beam is in a pi shape, is welded with the pressing and sinking steel beam and is used for increasing the contact surface of the well wall and the pressing and sinking steel beam, so that the structure of the pile cap of the pressing beam is stable and is not easy to damage.
4. The construction method of the prefabricated steel open caisson applicable to the central urban area as claimed in claim 1, wherein the construction method comprises the following steps: and the counter-force anchor box is fixedly connected with the concrete bearing platform through anchor bars.
5. The construction method of the prefabricated steel open caisson applicable to the central urban area as claimed in claim 1, wherein the construction method comprises the following steps: the center line of the center-penetrating jack, the center line of the anchor cable and the center line of the counter-force anchor box are positioned on the same vertical straight line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011437083.2A CN112609725A (en) | 2020-12-10 | 2020-12-10 | Prefabricated steel open caisson construction method suitable for central urban area |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011437083.2A CN112609725A (en) | 2020-12-10 | 2020-12-10 | Prefabricated steel open caisson construction method suitable for central urban area |
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| CN112609725A true CN112609725A (en) | 2021-04-06 |
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| CN202011437083.2A Pending CN112609725A (en) | 2020-12-10 | 2020-12-10 | Prefabricated steel open caisson construction method suitable for central urban area |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115198757A (en) * | 2022-07-19 | 2022-10-18 | 上海市基础工程集团有限公司 | Steel shell open caisson matching structure reverse construction method |
| CN115217141A (en) * | 2022-07-25 | 2022-10-21 | 上海市基础工程集团有限公司 | Thin-wall multilayer prefabricated steel structure open caisson and construction method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206289647U (en) * | 2016-11-10 | 2017-06-30 | 上海城建市政工程（集团）有限公司 | A kind of device for controlling open caisson sections process of press in |
| CN110644518A (en) * | 2019-09-16 | 2020-01-03 | 上海市基础工程集团有限公司 | Pressed-in type open caisson counterforce device combining steel beam and concrete bearing platform |
-
2020
- 2020-12-10 CN CN202011437083.2A patent/CN112609725A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206289647U (en) * | 2016-11-10 | 2017-06-30 | 上海城建市政工程（集团）有限公司 | A kind of device for controlling open caisson sections process of press in |
| CN110644518A (en) * | 2019-09-16 | 2020-01-03 | 上海市基础工程集团有限公司 | Pressed-in type open caisson counterforce device combining steel beam and concrete bearing platform |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115198757A (en) * | 2022-07-19 | 2022-10-18 | 上海市基础工程集团有限公司 | Steel shell open caisson matching structure reverse construction method |
| CN115217141A (en) * | 2022-07-25 | 2022-10-21 | 上海市基础工程集团有限公司 | Thin-wall multilayer prefabricated steel structure open caisson and construction method |
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Application publication date: 20210406 |